Mixer assembly for mixing at least two materials

The invention relates to a mixing assembly for mixing at least two materials.

Mixing assemblies for mixing two materials with one another are commonly known. Usually such assemblies comprise one or two cartridges comprising two outlets that are connected to a mixer. Upon use of the assembly, the two materials stored inside the one respectively two cartridges are urged towards the outlets such that they are dispensed from the cartridge(s) into the mixer.

Inside said mixer, the two materials are mixed with one another before the resulting mixed material is dispensed via a dispensing outlet at a front end of the mixer.

For reasons of sustainability, nowadays the mixers are often produced as reusable parts such that only the cartridges need to be replaced once they are empty. Apart from making such a concept more sustainable, this additionally lowers the cost of the assemblies for the user as one does not need to buy a new mixer with every new cartridge.

In view of the above it has become necessary to provide connection means configured to connect the mixer and the one or two cartridges with one another such that the mixer cannot fall off the cartridge(s) when the two materials are urged into the mixer.

Conventionally known connection means are for example simple plug-in connections that are easy to handle.

One disadvantage of such commonly known mixing assemblies is that the connection means often cannot withstand the high (shear) forces that act on the mixer when materials of high viscosities are urged into and mixed inside the mixer such that the connection between the mixer and the cartridge leaks. In some cases, the mixer even disconnects from the cartridge unintentionally upon use of high viscosity materials.

Another disadvantage of such conventionally known mixing assemblies is that they are often not suitable for applications where materials are supposed to be mixed at an uneven ratio. For such cases special mixers have already been developed. However, with such special mixers the alignment between the mixer and the cartridge(s), especially the outlets of the cartridge(s), is crucial in order for the mixer to be able to mix the two materials at said predetermined ratio.

It is therefore an object of the invention to provide a mixing assembly which enables a secure and correct connection as well as alignment between a mixer and a cartridge. This object is solved by the subject matter of independent claim 1.

In particular, the mixing assembly according to the invention comprises a mixer for mixing the at least two elements and a cartridge, in particular a two-component cartridge. The mixer comprises a mixer housing and a mixing element having a first end and a second end with a longitudinal axis extending therebetween, at least two entry openings arranged at the first end and one outlet opening arranged at the opposite second end of the mixer. Additionally, the mixing element is further arranged at least partly, in particular completely, within the mixer housing. The cartridge further comprises a head part having two outlet openings. The mixing assembly further comprises connection means configured to connect the mixer to the head part of the cartridge such that the outlet openings of the cartridge align with the inlet openings of the mixer, wherein the connection means are configured as a bayonet connection, and with the mixing assembly further comprising alignment means configured to align the mixer to the head part of the cartridge, wherein the alignment means comprise an alignment projection and a corresponding alignment recess that engage with one another.

Hence, one advantage of the invention is that the mixing assembly according to the invention provides a way to fixedly and safely secure the mixer to the cartridge by providing a bayonet connection between the two. Thus, even if high pressures act on the mixer in a dispensing direction, which can be caused by the materials stored inside the cartridge being compressed towards the outlets of the cartridge, and thus the inlets of the mixer, the mixer cannot unintentionally detach from the cartridge. For this reason, the bayonet connection between the mixer and the cartridge has proven to be particularly suitable as it provides both a secure connection that can withstand comparatively high pressures as well as an easy way of handling such that the user can easily attach and detach the mixer to and from the cartridge. The connection means can even be configured such that they align the mixer and the cartridge only at a predetermined angle with respect to one another. This may be advantageous, or in some cases even necessary, if the two materials to be mixed comprise, for example, different densities and/or viscosities, and/or if the two materials should be mixed in an uneven ratio with respect to one another. Hence, the connection means can even be configured such that they connect one predetermined outlet of the cartridge with one particular predetermined inlet of the mixer.

As the connection means are configured as a bayonet connection, the user may have to rotate at least a part of the mixer comprising the connection means with respect to the cartridge in order to bring the connection means from a locking to an unlocking position and vice versa. That is, in order to connect the mixer with the cartridge, the user may have to align the mixer with the cartridge in a first position, i.e. the unlocking position. Then they may need to rotate the mixer with respect to the cartridge, for example in a clockwise direction, in order to bring the connection means in the locking position where the mixer is fixedly connected to the cartridge. By rotating the mixer in an opposite direction, for example an anticlockwise direction, with respect to the cartridge, the connection means can then be brought in the unlocking position again.

According to the invention the mixing assembly further comprises additional alignment means configured to align the mixer to the head part of the cartridge, wherein the alignment means comprise an alignment projection and a corresponding alignment recess that engage with one another.

By providing additional alignment means apart from the connection means, the invention can ensure that the mixer and the head part of the cartridge can only be aligned, and thereby also connected, to one another in one particular way, i.e. at one particular angle with respect to one another. This is done by providing the alignment projection together with the corresponding alignment recess that are configured to engage with one another by inserting the projection into the corresponding recess.

In this connection it should be noted that generally it does not matter whether the alignment projection respectively the alignment recess is arranged at the mixer or at the head part of the cartridge. Hence, in one embodiment the alignment process can be arranged at the mixer while the corresponding alignment recess is arranged at the head part of the mixer. According to an alternative embodiment the alignment projection can be arranged at the head part of the cartridge while the corresponding alignment recess is arranged at the mixer. Both embodiments could be equally applied.

Hence, the invention provides a mixing assembly with which both the alignment of the mixer with respect to the cartridge(s) as well as the connection between the two can be improved with respect to prior art devices.

The invention is further defined by the features of the dependent claims.

According to a first embodiment of the invention the mixer housing may comprise a gripping part, in particular a ring, configured to be grabbed by a user to lock and/or unlock the bayonet connection. That is, the mixer housing can comprise a certain part, i.e. the gripping part, that is designed such that a user intuitively grabs said part of the mixer housing when trying to lock and/or unlock the bayonet connection. In particular, this may be realized by providing a certain structure and/or certain optics to the gripping part that lead to the user reaching out to this part of the mixer housing.

For example, said gripping part can be designed as a ring that is radially fixed to the mixer housing while at the same time being free to rotate around the longitudinal axis of the mixer. In this way, the gripping part, i.e. the ring, can be rotated in order to lock/unlock the bayonet connection of the mixing assembly while the rest of the mixer and the mixer housing including the alignment means is already radially fixed with respect to the cartridge(s).

In this connection it should be noted that the gripping part can also comprise a plurality of ribs arranged at an outer surface of the mixer housing and along the longitudinal axis of the mixer configured to enhance the surface roughness of the gripping part. The provision of a plurality of ribs at an outer surface of a housing is a commonly known tool to enhance the roughness of a surface which allows a better handling. This is particularly advantageous in embodiments that include a rotation of the gripping part such as it is the case with the invention where the mixer and the cartridge have to be rotated with respect to one another to lock/unlock the bayonet connection.

According to another embodiment the connection means of the mixing assembly may consist of a at least one protrusion and at least one corresponding recess that is configured to engage with the protrusion. As it is common practice with a bayonet connection, the recess may be formed such that it enables the protrusion to engage with the recess in a first position, i.e. an unlock position, where the protrusion can also be detached from the recess. Furthermore, the recess can be formed such that the protrusion can travel along it to move into the locking position. This can for example be done by rotating the mixer and the head part with respect to one another. Finally, the recess can also be formed such that the in a second position, i.e. a locking position, the protrusion is fixedly held by the recess such that it cannot detach from the recess, i.e. such that the mixer cannot be detached from the head part of the cartridge. It could be found that such a connection between the head part and the mixer is easy to handle yet still reliable and strong.

In this connection it should be noted that the at least one protrusion can be arranged at the mixer and the at least one corresponding recess can be arranged at the head part of the cartridge.

According to an alternative embodiment of the invention the at least one protrusion can be arranged at the head part of the cartridge and the at least one corresponding recess can be arranged at the mixer.

According to further embodiments it is possible that the protrusion engages with the recess from a radially outer side or from a radially inner side. That is, the mixer can either be connected with the head part of the cartridge such that the head part covers at least a part of the mixer, i.e. the mixer is being inserted into the head part. Alternatively, it can also be possible that the mixer covers the head part when the two are connected to one another, i.e. the head part is inserted in the mixer at least in parts.

The choice of whether the protrusion should engage with the recess from the outer or the inner side may, for example, depend on the design of the mixer and/or the design of the head part of the cartridge and/or the design of the housing. That is, for some embodiments it may be advantageous if the protrusion engages with the recess from a radially outer side while for other embodiments the alternative embodiment can be preferable.

According to another embodiment the recess may be arranged at a ledge arranged at an end plate of the head part or the mixer. That is, the head part of the cartridge may comprise an additional end plate on which a ledge is arranged. The ledge and the end plate can either be formed integrally with one another or separately. In the latter the case the ledge needs to be fixed to the end plate by means of a suitable connection choice such as gluing or the like. Additionally, it may also be possible that the ledge and the end plate are integrally formed with the rest of the head part such that the complete head part of the cartridge is formed of one single piece, for instance by means of molding.

The ledge can be L-shaped with the recess being formed between the ledge and the end plate such that protrusion is held between the L-shaped ledge and the end plate. That is, according to this embodiment, the recess of the connection means can be formed by the L-shaped ledge and the end plate, in particular a surface of the end plate such that the protrusion is held by both the end plate and the ledge.

Alternatively, the ledge can be C-shaped with the recess being formed therein such that the protrusion engages with the recess. Hence, in this case the recess is formed solely by the ledge such that only the ledge engages with the protrusion in order to hold it.

According to another embodiment at least a part of the connection means, e.g. the protrusion, may be arranged at the mixer housing, in particular at an outer surface of the mixer housing. This has the advantage the it does not matter what kind of mixer is used for the assembly as the mixer housing is the part of the mixer which is fixedly connected to the head part of the cartridge. Thus, it could also be possible to manufacture a common mixer housing for a number of different types of mixers and yet still have the advantage of the secure bayonet connection and possibly also the alignment means.

According to a further embodiment the ledge may be further configured to align the mixer and the cartridge at a predetermined angle with respect to one another. That is, the ledge may further comprise an alignment structure that only allows the mixer and the head part of the cartridge to engage with one another at a certain angle. Hence, the ledge may support the alignment means.

The mixing assembly may further comprise second alignment means configured to align the mixer and the cartridge at a predetermined angle with respect to one another. As the correct alignment of the mixer and the cartridge is crucial for mixing assemblies as the ones according to the invention the mixing assembly can further comprise additional second alignment means that help aligning the mixer with respect to the cartridge. Such second alignment means can be formed in various ways. For example, according to one embodiment the second alignment means may also comprise an alignment protrusion and at least one corresponding alignment recess. This way, the user can easily see how to align the mixer and the cartridge correctly, as they only need to align the protrusion with its respective recess. Generally, it does not matter whether the recess is formed at the mixer or at the cartridge. However according to one embodiment it may be preferred that the protrusion is arranged at the mixer, preferably at the mixer housing, and the recess is arranged at the cartridge, preferably at the head part of the cartridge.

Further embodiments of the invention are described in the following description of the Figures. The invention will be explained in the following in detail by means of embodiments and with reference to the drawings in which is shown:

Fig. 0-1 : an exploded view of a mixing assembly according to the invention;

Fig. 0-2: a detailed view of the connection between the mixer and the cartridge;

Fig. 0-3: a perspective view and a cross section of the connection between the mixer and the cartridge in a locked position;

Fig. 0-4: four cross sections as well as corresponding exploded views of the ledge;

Fig. 0-5: side views of the connection between the mixer and the cartridge;

FIG. 0-6: a perspective side view of a further mixing configuration and a top view of the inlet section thereof in accordance with a first exemplary embodiment;

FIG. 0-7: a perspective side view of a mixing configuration and a top view of the inlet section thereof in accordance with a second exemplary embodiment;

FIG. 0-8: a perspective side view of a mixing configuration and a top view of the inlet section thereof in accordance with a third exemplary embodiment;

FIG. 0-9: a perspective side view of a mixing configuration and a top view of the inlet section thereof in accordance with a fourth exemplary embodiment;

FIG. 0-10: a cross sectional side view of the inlet section of a mixing configuration provided with two one-way valves for the inlet openings;

FIG. 0-11A to FIG. 0-11C: three exemplary embodiments of preferable mixing configurations;

FIG. 1 -1 : an exploded view of a static mixer in accordance with a first supplementary aspect having two mixing elements (two-hole version);

FIGS. 1-2 to 1-4: perspective views illustrating alternate embodiments of the mixing elements of FIG. 1-1 ; FIGS. 1-5a and 1-5b: perspective views illustrating mixing elements with two separating flanges per section (three-hole version);

FIG. 1-6: a cross-sectional view illustrating a longitudinal section through a mixer with the mixer elements of FIG. 1-5;

FIGS. 1-7a and 1-7b: perspective views illustrating deflection plates for mixing elements with three separating flanges (four-hole version);

FIG. 1-8: a partial perspective view illustrating mixing elements for a square tube;

FIG. 1 -9: a diagram with measured results for the coefficient of variation s/x (with x

=0.5);

FIG. 2-1 : a perspective view of a section of a mixer structure which has only mixingactive chambers;

FIG. 2-2: a perspective view of the geometrical construction of the mixer structure of FIG. 2-1 ;

FIG. 2-2a: a cross-section through the structure of FIG. 2-2;

FIG. 2-3: a first modification of the mixer structure shown in FIG. 2-1 ;

FIG. 2-4: a second modification of the mixer structure shown in FIG. 2-1 ,

FIG. 2-5: a perspective view of a first mixer structure in accordance with the aspect with re-layering chambers;

FIG. 2-6: a perspective view of a second mixer structure in accordance with the aspect with re-layering chambers;

FIG. 2-7: an unwrapped view into a plane of the edges lying at the periphery of the mixer structure in accordance with FIG. 2-1 ;

FIG. 2-8: a corresponding unwrapped view for a mixer structure in accordance with

FIG. 2-5;

FIG. 2-9: an unwrapped view for a mixer structure in accordance with FIG. 2-6;

FIG. 2-10: a perspective view of a mixer structure with an additional, advantageous, structure element;

FIG. 2-11 : a perspective view of a first laterally reinforced mixer structure;

FIG. 2-12: a perspective view of a second mixer structure with lateral reinforcement;

FIG. 2-13: a schematic representation of a mixer structure with a bundle of four chambered strings;

FIG. 2-14: a schematic representation of a mixer structure with nine chambered strings;

FIG. 2-15: a schematic representation of a mixer structure with sixteen chambered strings; FIG. 3-1 : a first exemplary embodiment of a mixer of the supplementary third aspect in a perspective view;

FIG. 3-2: the starting position prior to mixing;

FIG. 3-3: a corresponding mixing diagram;

FIG. 3-4 shows a flow diagram of the mixing operation;

FIG. 3-5: the mixer of FIG. 3-1 in the inverse flow direction;

FIG. 3-6: the starting position of the mixer of FIG. 3-5 prior to mixing;

FIG. 3-7: a mixing diagram relating to FIG. 3-6;

FIG. 3-8: a flow diagram of the mixer of FIG. 3-5 in the mixing operation;

FIG. 3-9: a second exemplary embodiment of a mixer of the aspect in a perspective view;

FIG. 3-10: the starting position prior to mixing;

FIG. 3-11 : a diagram of the mixing operation in the mixer of FIG. 3-9;

FIG. 3-12: a flow diagram of the mixing operation in the mixer of FIG. 3-9;

FIG. 3-13: a combination of mixing elements according to the invention and of a mixing helix known per se in the prior art;

FIG. 3-14: a detail of an alternative embodiment of FIG. 3-9;

FIG. 3-15: another exemplary embodiment of a mixer of the invention;

FIG. 3-16: a flow diagram of the mixing operation in the mixer of FIG. 3-15;

FIG. 3-17: an enlarged detail of the mixer of FIG. 3-15;

FIGS. 4-1a and 4-1 b: a first type of static mixer in a first type of mixer housing;

FIGS. 4-2a to 4-2e: a first type of mixer inlet section;

FIGS. 4-3a to 4-3c: a first type of mixing element;

FIGS. 4-4a and 4-4b: perspective part views of the first type of static mixer;

FIGS. 4-5a and 4-5b: a second type of static mixer in a second type of mixer housing;

FIGS. 4-6a to 4-6e: a second type of mixer inlet section;

FIGS. 4-7a to 4-7c: a second type of mixing element;

FIGS. 4-8a and 4-8b: perspective part views of the second type of static mixer;

Fig. 4-9: a dispensing apparatus;

Fig. 4-10: sectional views of molding devices;

FIG. 5-1 : a longitudinal section of a mixer;

FIG. 5-2: a view of the inlet end of the mixer;

FIG. 5-3: a longitudinal section of a cartridge;

FIG. 5-4: a top view of the cartridge of FIG. 5-3 with distanced outlets and ring- shaped bayonet means; FIG. 5-5: a longitudinal section of a cartridge having two containers with different cross-sectional areas;

FIG. 5-6: a top view of the cartridge of FIG. 5-5 with distanced outlets and ring- shaped bayonet means;

FIG. 5-7: a longitudinal section of a mixer;

FIG. 5-8: a view of the inlet end of the mixer;

FIG. 5-9: a longitudinal section of a cartridge with distanced outlets and ring-shaped bayonet means;

FIG. 5-10: a top view of the cartridge of FIG. 5-9 with a nose piece;

FIG. 5-11 : a top view of a coupling ring;

FIG. 5-12: a section of the coupling ring of FIG. 5-11 ;

FIG. 5-13: a longitudinal section of a variant of the mixer of FIG. 5-7 and 5-8 attached to the cartridge of FIGS. 5-5 and 5-6 having containers with different cross-sectional areas;

FIG. 5-14: a longitudinal section of a cartridge with distanced outlets;

FIG. 5-15: a top view of the cartridge of FIG. 5-14;

FIG. 5-16A: a view on the mixer side of a locking ring to be attached to the cartridge;

FIG. 5-16B: a view on the cartridge side of the locking ring of FIG. 5-16A;

FIG. 5-17: a section of the looking ring according to the line XVII — XVII of FIG. 5-16B; FIGS. 5-18 and 5-19: two longitudinal sections at 90° to each other a mixer attached to the cartridge of FIG. 5-14 with the locking ring of FIGS. 5-16A to 5-17, in the locked position;

FIGS. 5-20 to 5-21 : as first embodiment a two part closure cap in a longitudinal section and a view on its cartridge side face;

FIGS. 5-22 to 5-23: as second embodiment a one part closure cap for use with a coupling ring in a longitudinal section and a view on its cartridge side face;

FIGS. 5-24 to 5-25: as third embodiment a one part closure cap for use with a locking ring attached to the cartridge in a longitudinal section and a view on its cartridge side face;

FIGS. 5-26: a longitudinal section of a mixer attached to a partially shown cartridge;

FIG. 5-27: a view of the inlet end of the mixer;

FIG. 5-28: a top view of the cartridge of FIG. 5-26;

FIG. 5-29: a longitudinal section of a mixer attached to a partially shown cartridge;

FIG. 5-30: a view of the inlet end of the mixer;

FIG. 5-31 : a top view of the cartridge of FIG. 5-29;

FIG. 5-32: a longitudinal section of a mixer attached to a partially shown cartridge; FIG. 5-33: a view of the inlet end of the mixer;

FIG. 5-34: a top view of the cartridge of FIG. 5-32;

FIG. 5-35: a longitudinal section of a mixer attached to a partially shown cartridge;

FIG. 5-36: a top view of the cartridge of FIG. 5-35;

FIG. 5-37: a view of the inlet end of the mixer;

FIG. 5-38: a longitudinal section of a mixer attached to a partially shown cartridge;

FIG. 5-39: a top view of the cartridge of FIG. 5-38;

FIG. 5-40: a view of the inlet end of the mixer;

FIG. 5-41 : a longitudinal section of a mixer;

FIG. 5-42: a longitudinal section of a coupling ring;

FIG. 5-43: a top view of the coupling ring of FIG. 5-42;

FIG. 5-44: a longitudinal section of the mixer attached to a partially shown cartridge via the coupling ring;

FIG. 5-45: a longitudinal section of a mixer attached to a partially shown cartridge;

FIG. 5-46: a top view of the cartridge of FIG. 5-41 ;

FIG. 5-47: a view of the inlet end of the mixer;

FIG. 5-48: a top view of a cartridge like in FIG. 5-39, with additional coding means;

FIG. 5-49: a section of the inlet end of a mixer like in FIG. 5-38, with additional coding means;

FIG. 5-50: a view of the inlet end of the mixer of FIG. 5-49;

FIGS. 5-51 and 5-52: a variant of the coding means at the cartridge and mixer;

FIGS. 5-53 and 5-54: a further variant of the coding means at the cartridge and mixer;

FIGS. 5-55 and 5-56: a further variant of the coding means at the cartridge and mixer; and

FIGS. 5-57 and 5-58: a further variant of the coding means at the cartridge and mixer.

In the following, a first and a second embodiment of the mixing assembly for mixing at least two components will be described in connection with Figs. 0-1 to 0-5.

An exploded view of the mixing assembly according to the invention can be seen in Fig. 0-1 . The mixing assembly comprises a mixer 1 and a cartridge 3 that can be connected with one another. In the present case the cartridge 3 is designed as a side-by-side cartridge 3 comprising a cartridge head 29 together with two containers 13a, 13b that are arranged next to one another. The containers 13a, 13b can be designed as film bag cartridges that comprise a flexible outer wall which can be compressed upon use such that the materials stored inside said cartridges 3a, 3b is pressed towards the cartridge head 29.

The cartridge head 29 is usually made out of a solid material an comprises two outlet openings 15a, 15b through which the materials stored inside the cartridge 3 can be dispensed. The cartridge head 29 is configured such that it can be connected with the mixer 1 .

The mixer 1 comprises a mixer housing 5 and a mixing element 7 with said mixing element optionally being configured as a mixing configuration 7 arranged at least partly within the mixer housing 5. The mixing configuration 7 is defining a mixing flow path between at least two inlet openings 9a and 9b arranged at a first axial end of the mixing configuration 7, respectively of the mixer housing 5, and at least one dispense opening 11 arranged at an axially opposite end of the mixing configuration 7, respectively of the mixer housing 5.

According to the present invention the mixing assembly further comprises connection means 17 configured to connect the mixer 1 to the cartridge 3 by means of a bayonet connection.

The bayonet connection 17 can be configured in several different ways. Some of them are described in the following. First of all, it is noted that in order to lock the bayonet connection 17 between the mixer 1 and the cartridge 3, the mixer 1 and cartridge 3 have to be connected with one another by means of an axial approaching movement. Then, the mixer 1 and the cartridge 3 are rotated with respect to one another in order to bring the bayonet connection 17 from an unlocking to a locking position where the two components are fixedly connected with one another (see Fig. 0-3).

The bayonet connection 17 shown in Figs. 0-1 to 0-6 is configured such that the mixer 1 , in particular the mixer housing 5, comprises a protrusion 18a whereas the cartridge head 29 comprises the corresponding recess 18b which engages with said protrusion 18a. Said recess 18b can either be formed directly at the cartridge head 29, for example at the outlet openings 9a, 9b, or at a ledge 31 which is arranged at an end plate 30 of the cartridge head 29 (see Fig. 0-4).

Either way, the connection means 17 can be configured such that the protrusion 18a engages with the recess 18b either from a radially outer side or from a radially inner side. Also, the ledge 31 can either be formed as a continuous ring or as one or more ring segments (see Fig. 0-4).

The above mentioned ledge 31 can also be designed in different ways, some of which can be seen in Fig. 0-4 that shows two different embodiments of the ledge 31 . In one embodiment, the ledge 31 comprises an L shape such that the recess 18b of the connection means 17 is formed between the ledge 31 and the end plate 30 of the cartridge head 29. In another embodiment the ledge 31 comprises a C shape such that the recess 18b is formed entirely at the ledge 31 . Also in connection with these two embodiments it can be seen that the protrusion 18a can either engage from a radially outer or a radially inner side.

The mixing assembly according to the invention further comprises alignment means 19 configured to align the mixer 1 relative to the head part 29 of the cartridge 3, wherein the alignment means 19 comprise an alignment projection 20a and a corresponding alignment recess 20b that engage with one another (see Fig. 0-2).

The alignment means 17 can be designed in various different ways. For example, generally it does not matter whether the alignment protrusion 20a is arranged at the mixer 1 or at the cartridge 3. The embodiment shown in Fig. 0-2 is designed such that the mixer 1 , in particular the mixer housing 5, comprises the alignment protrusion 20a that is basically a pin 20a whereas the end plate 30 of the head part 29 of the cartridge 3 comprises the alignment recess 20b into which the pin 20a can be inserted. This way it can be ensured that the mixer 1 and the cartridge 3 can only be connected with one another at one particular angle such that the outlet openings 15a, 15b of the cartridge 3 are perfectly aligned with the inlet openings 9a, 9b of the mixer 1 . In particular, it can also be ensured that the one particular outlet 15a, 15b is connected with one particular inlet 9a, 9b. This can be advantageous or even necessary when materials are supposed to be mixed with one another at an uneven ratio, i.e. a ratio that differs from a 1 :1 ratio. To further support the alignment of the mixer 1 with respect to cartridge 3, the mixing assembly shown in the Figures further comprises second alignment means 21 comprising a second alignment protrusion 22a and a corresponding alignment recess 22b. In the embodiments shown in Figs. 0-1 to 0-5 the second alignment protrusion 22a is arranged at the mixer housing 5 while the second alignment recess 22b is arranged at the head part 29 of the cartridge 3. However, generally it could also be the other way around.

It can be clearly seen Fig. 0-5 that the second alignment means 21 are also configured such that the mixer 1 and the cartridge 3 can only be connected with one another at one particular angle. Therefore, the second alignment recess 22b is divided into two recess sections 22b’, 22b” with the first recess section 22b’ extending axially with respect to the mixer 1 such that the protrusion 22a can slide along said first recess section 22b’ when the mixer 1 and the cartridge 3 are axially approached with respect to one another. Once the two components touch, said components can be rotated with respect to one another to lock the bayonet connection 17. Upon this rotation, the second alignment protrusion 22a can slide circumferentially until it reaches the second recess section 22b” where the protrusion 22a comes to rest (see Fig. 0-1 and 0-2).

In this connection it should be noted that the first recess section 22b’ can be arranged at the above mentioned ledge 31 .

The Figures further show that the mixing assembly can comprise a gripping part 2 at the mixer housing 5 designed as a retaining ring 2 configured to be grabbed by a user to lock and/or unlock the bayonet connection 17. In this connection it can be advantageous when the retaining ring 2 is the only part which is rotated when the mixer 1 and the cartridge 3 are connected with one another. Hence, in this case, the relevant parts of the connection means 17, i.e. the protrusion 18a, as well as the relevant parts of the second alignment means 13, i.e. the second alignment protrusion 14a (if available), are preferably formed at the retaining ring 2, such that the rest of the housing 5 is not rotated once the mixer 1 is in contact with the cartridge 3.

The retaining ring 2 can further comprise ribs or the like at its outer surface that are configured to enhance the surface roughness of the retaining ring 2 such that a user can better grab and rotate the retaining ring 2. As can be seen from the above, with the different parts of the connection means 17 as well as the alignment means 19 and second alignment means 13 being arranged at the mixer housing 5, it is not relevant what kind of mixing element7mixing configuration 7 is arranged inside the mixer housing 5.

The above described mixing configuration 7 is configured to mix the components received via the inlet openings 9a and 9b when flowing from the inlet openings 9a and 9b along the mixing path through the mixer housing 5 to the dispense opening 11 . Thus, a mixture of said two (or more) components can be dispensed at the dispense opening 11 .

Three preferable exemplary embodiments for such a mixing configuration 7 are shown in FIGS. 0-11A to 0-11C. All of these exemplary embodiments for the mixing configuration 7 are formed of two sections with different mixing elements 7a, 7b and 7c, which results in a quite satisfying mixing of the component. However, also other combinations than the illustrated ones, in particular comprising more or less than two different sections and or other mixing elements can be implemented.

In FIG. 0-11A the so-called “T-Helix-Mixer” is illustrated. This mixing configuration 7 comprises T-like shaped mixing elements 7a in a first section of the mixing configuration 7 (seen along the mixing flow path) combined with helically shaped mixing elements 7b in a second section of the mixing configuration 7 (seen along the mixing flow path).

In FIG. 0-11 B the so-called “Quadro-Helix-Mixer” is illustrated. This mixing configuration 7 comprises more or less cubic of L-shaped mixing elements 7c in a first section of the mixing configuration 7 (seen along the mixing flow path) combined with helically shaped mixing elements 7b in a second section of the mixing configuration 7 (seen along the mixing flow path).

In FIG. 0-11C the so-called “Quadro-T-Mixer” is illustrated. This mixing configuration 7 comprises more or less cubic or L-shaped mixing elements 7c in a first section of the mixing configuration 7 (seen along the mixing flow path) combined with T-like shaped mixing elements 7a in a second section of the mixing configuration 7 (seen along the mixing flow path). Said cubic or L-shaped mixing elements 7c can be seen also in FIG. 0- 6 (referred to below). In general, the components to be mixed with each other are liquids or have at least certain fluidity, and are stored in separate component reservoirs 13a and 13b of the multi-component cartridge 3. Each of these component reservoirs 13a and 13b is connected to its own outlet opening 15a or 15b.

To ensure a satisfying mixing of these components, it is not only possible to adapt the specific configuration and combination of the mixing elements 7a to 7c of the mixing configuration 7, but also to adapt the inlet section of the mixing configuration 7. Preferable configurations for the inlet sections in the vicinity of the inlet openings 9a and 9b of the mixing configuration 7 are illustrated in FIGS. 0-6 to 0-9.

As illustrated in FIG. 0-6, the inlet section can be provided with two identical and round transitional openings 35a and 35b miss-aligned slightly with the inlet openings 9a and 9b. Such a configuration results in the formation of a first mixing chamber 37 between the inlet openings and the transitional openings 35a and 35b and of a second mixing chamber 39 between the transitional openings 35a and 35b and the mixing elements 7c.

As illustrated in FIG. 0-7, the inlet section can also be provided with a first small transitional opening 35a for a small inlet opening 9a and with a larger transitional opening 35b for a larger inlet opening 9b. As can be seen further, the transitional openings do not have to be round in cross section and can be aligned with the corresponding inlet openings 9a and 9b. Moreover, in particular the second mixing chamber 39 can be provided with an in particular T-like shaped inlay member 41 promoting the mixing of the components within the second mixing chamber 39.

As further illustrated in FIG. 0-8 two identical but non-round transitional openings 35a and 35b totally aligned or miss-aligned from the corresponding inlet openings 9a and 9b can be used. Furthermore, the inlay member 41 can have other shapes like a W-shape.

As further illustrated in FIG. 0-9, also configurations with a very complex inlay member 41 and not two separate mixing chambers are possible.

Finally, it is pointed to the fact that the cartridge head 29 can be provided with valves 43a and 43b, in particular with one-way valves, for the outlet openings 15a and 15b, preventing the mixture from the mixer to flow back onto the component reservoirs 13a and 13b. Such a configuration is illustrated in FIG. 0-10.

In the following, several supplementary aspects for the present invention will be described. For each of these supplementary aspects, an independent set of figures with a specific set of reference numerals and designations of specific components are used. However, a skilled artisan should have no problem in identifying the respective correspondences throughout the various aspects.

For the present invention and for further delimitation thereof, in particular the features referring to the specific implementations of the provided mixing configurations are considered highly relevant. In particular the specific implementation of the mixing configurations in the connection area between the mixers and the multi-component cartridges, i.e. in the vicinity of the inlet openings, and the specific structural implementations of the mixing flow paths within the mixer housings are considered relevant as possible aspects for further delimitation of the present invention.

In the following, embodiments of a supplementary first aspect will be described with reference to the FIGS. 1-1 to 1-9:

The mixing elements 1 and 1 ‘ of FIG. 1-1 arranged in a tube 10 each comprise two separating flanges 2 and 2’, and two deflecting plates 3 and 3‘ which lie in a plane 3a, 3a‘ respectively indicated by the chain-dotted lines. The plane 3a lies perpendicular to the tube axis 5 and parallel to planes 2a and 2b, which define the upper edge 20 and the lower edge 21 of the separating flanges 2 respectively. The three planes 2a, 3a and 2b define and bound two sections 1a and 1 b of the mixing element 1. To each section is assigned one of the two separating flanges 2 subdividing the section. The separating flanges 2 of the two sections 1a and 1 b cross one another at right angles. The tube cross section is subdivided into four equal subareas by the separating flanges 2, where two of these subareas are covered by the deflecting plates 3. The two open subareas are provided as constrictions and passage holes 4 for the medium to be mixed.

The two successive mixing elements 1 and T are formed substantially in the same way. However, mixing element 1 represents the mirror image of mixing element T. The neighboring separating flanges 2 and 2‘ cross one another; the open subareas 4 and 4‘ are arranged in a mutually offset manner. The deflecting plates 3 can also subtend an angle a with the cross-sectional plane 3a - see FIG. 1-2. This angle a is advantageously chosen to be not greater than 30°. FIGS. 1- 3 and 1-4 show further embodiments with inclined surfaces. If the axis 5 is understood to be vertical, the arrow 6 in FIGS. 1-2 to 1-4 represents the fall line of a deflecting plate 3. In FIG. 1-2 this arrow 6 is parallel to the upper separating flange 2. In the exemplary embodiment of FIG. 1-3 the arrow 6 is tangential to a circular cylinder concentric with the axis 5. In the exemplary embodiment of FIG. 1-4 the arrow 6 is directed radially outwards.

FIGS. 1-5a and 1-5b show mixing elements 1 and 1 ‘ in each of which two separating flanges 2 are respectively associated with a section bounded by the upper edges of the flanges 2 and the plates 3 and a section bounded by the plates 3 and the lower edges of the flanges 2 , as analogous to 1a and 1 b of FIG. 1-1 (not shown in FIGS. 1-5a and 1- 5b). On both sides of each separating flange 2 is placed exactly one open subarea 4. The mixing element T with the open subareas 4‘ represents an immediately neighboring element of the mixing element 1 . The open subareas 4 and 4‘ are arranged in a mutually offset manner. In the three-hole version (FIGS. 1-5a and 1-5b) the two mixing elements 1 and T are identical and not mirror imaged as in the two-hole version (FIG. 1-1).

For efficient manufacture of the three-hole mixing body (FIGS. 1-5a and 1-5b) by the process of injection molding, the mixing elements can be divided into two halves. The boundaries between the half elements are shown in FIGS. 1-5a and 1-5b as chain-dotted lines 7 and 7‘ respectively. Monolithic partial bodies each containing a series of such half elements can be constructed simply using two-part tools. The entire mixing body (1 , T) is formed by joining together two matching monolithic partial bodies.

The longitudinal section of FIG. 1-6 shows the individual mixing elements 1 and T alternately stacked closely upon one another. Spacings between individual neighboring elements or between all elements can however also be provided. Mixing elements built in with spacing can be connected by connecting pieces to form a monolithic mixer.

In FIG. 1-6 the course of the flow of the medium to be mixed is also indicated by the arrows 8, 8’ and 8”. Arrow 8’ is perpendicular to the plane of the diagram and is directed forwards; arrow 8” - also normal - is directed towards the rear. The reference symbol 9 points toward a position at which the arrows indicate the creation of two partial streams. It is advantageous for the deflection plates 3 of each element (1 , 1’) to lie in a common plane. In the presence of at least two separating flanges 2 per section (three-hole version) several deflection plates 3 can be joined together to form a common plate or a single plate 30 (four-hole version), as shown in FIGS. 1-5a and 1-5b and the corresponding FIGS. 1-7a and 1-7b for the four-hole version.

In each of FIGS. 1-7a and 1-7b only the single and common deflection plate 30 or 30‘ is shown. The chain-dotted lines 23 represent the lower edges of the upper separating flanges. As in the previous two-hole version the neighboring mixing elements are mirror images of one another.

In place of a circular cross section, the mixer can have a cross section of any other shape, for example that of a square. The angles of crossing between the neighboring separating flanges 2, 2‘ can also deviate from 90°. The sections 1a and 1 b (see FIG. 1- 1 ) can be of different lengths. It is advantageous for the length of the sections 1 a and 1 b to be in the range from D/8 to D; it is preferably D/4.

FIG. 1-8 illustrates what deviations from the simple form described above are conceivable. In this embodiment, connecting elements 35 are placed between the spaced mixing elements 1 , T. The separating flanges 2 have additional elements 25, 26 as strengthened or stream deflectors. Separating flanges 2‘ and 2” of neighboring mixing elements T and 1” are fitted together at the position 29. Some of the separating flanges 2 and deflection plates 3 are nonplanar.

The mixing elements 1 and T have different numbers of separating flanges 2 and 2‘ persection 1a and 1b respectively, namely two and one respectively. One separating flange 2 has a recess 29. FIG. 1-8 is understood merely as illustrating individual features; this particular combination of all features listed in a single mixer does not preclude other combinations.

The tube 10 can also be shaped conically (not shown) so that it tapers in the direction of flow. In this case, the mixing bodies 1 , T must be constructed in differing sizes corresponding to the varying cross section. The diagram in FIG. 1-9 shows the dependence of the coefficient of variation s/x on L/D for x 0.5 in accordance with the above-mentioned experiments, x = 0.5 means that the proportions of the components to be mixed are equally large. The reference symbols 1* to 5* refer to the mixer types that are listed in the above table.

The mixer which can be constructed monolithically of little material, can advantageously be constructed of an economical, combustible plastic by injection molding. This mixer is especially suitable for use as a one-way article.

The mixer can also be used to mix turbulently flowing media.

In the following, embodiments of a supplementary second aspect will be described with reference to the FIGS. 2-1 to 2-15:

The static mixer shown in FIG. 2-1 comprises a mixer structure 1 which is arranged in a tube 10. The mixer structure 1 is composed of mixing elements 1 ‘, each of which consists of two separating flanges 2, 2‘ and two deflection plates 3, 3’. In the plane of the deflection plates 3, 3’, there are two open subsurfaces 4, 4‘, which have also been designated as passage holes.

The geometrical construction of the mixer structure 1 - see FIGS. 2-2 and 2-2a - can be described as a pack or bundle of chambered strings A, B, C and D oriented in the direction of the Z-axis. The designations of the chambers are A1 , A2, . . . B1 , B2 . . . C1 , C2, . . . and D1 , D2, . . .. These chambers are “mixing-active”; they each extend in the direction of the tube 10 between two closed ends e1 , e2; and two mutually adjacent side walls of the mixing-active chambers contain four passages a1 , b1 , a2 and b2 (each with a surface marked with a cross in FIG. 2-2) of alternating disposition. The chamber C2 is connected via the passages a1 and b1 to the two chambers A1 , B1 lying upstream as well as via the passages a2 and b2 to the two chambers A2, B2 lying downstream. All the chambers in the mixer of FIG. 2-1 are mixing-active. In general, however, a mixingactive chamber can also be connected to other chambers (relayering or intermediate chambers, see further below).

The strings A and B - seen as cross-sections in FIG. 2-2a - have the same construction; string A can be brought to coincidence with string B by a 180° rotation about the z-axis (or the centerline 5). The same relationship exists between the strings C and D. The strings of a pair A, B are connected to the respective strings of the other pair C, D via the chamber passages a1 , . . The two string pairs differ in that the chambers of the one pair are arranged so as to be displaced in the Z-direction by half a chamber length with respect to those of the other pair.

How the medium to be mixed is re-directed or reformed in the chamber C2 is indicated by the arrows 6a, 6b, 7a and 7b in FIG. 2-1 . Two medium flows emerge from the strings A and B through the entry passages a1 (arrows 6a, 6b) and b1

(arrows 7a, 7b) into the chamber C2 and thus into the string C, unite there and influence each other in their movement through the chamber C2. At the edge 20 near the passage exit a2 a first separation off of a first partial flow (arrows 6a, 7a) takes place, which passes over into string A. The remaining partial flow (arrows 6b, 7b) enters into the string B via the exit passage b2. In the ideal case there is a uniform distribution, as indicated by the arrows, with each arrow corresponding to the same amount of transported mixing material.

The chambers of the mixer structure 1 are substantially in the shape of a rectangular prism and the passages are rectangular. The walls are executed in the shape of plates. The walls need not have constant wall thicknesses, however; they can for example be executed with a wedge shape as illustrated in FIG. 2-3.

Curved shapes can also be used for the walls, as is illustrated in FIG. 2-4, in order that the pressure drop in the mixing material produced by the mixer structure be smaller than that with the mixer structure of FIG. 2-1 .

In additional to the mixing-active chambers the mixer structure 1 contains “re-layering chambers” S1 , S2 - see FIG. 2-5 - and ST, S2‘ (not visible in FIG. 2-5 ) . The chamber S1 has two entry passages a1 and b1 as well as an exit passage t1 . The passage t1 forms the connection to an intermediate chamber T (or transfer chamber) which has only one entry, namely the passage t1 , and one exit t2 (not visible). A corresponding intermediate chamber T‘ with an entry t1 ‘ and an exit t2‘ is arranged diametrically with respect to T. The intermediate chambers T and T‘ lead further to re-layering chambers S2‘ (not visible) and S2 respectively, each of which contains one entry passage and two exit passages. For S2 these passages are the passages designated by t2‘ and a2 and b2 respectively. The chambers S1 and S2‘ and the chambers ST and S2 each form a pair connected by a transfer chamber T, T‘ respectively. In these chamber pairs a re-layering of the layers takes place which leads to the improvement of the mixing quality. A further mixing step takes place at the same time in the second re-layering chamber S2, S2‘.

FIG. 2-6 shows a second embodiment of the mixer structure in which re-layering chambers S1 , S2‘ and S1 ‘, S2 , which are present pairwise, are directly adjacent. From the oblique views of FIGS. 2-1 , 2-5 and 2-6 the interconnection of the individual chambers is difficult to see or cannot be seen in its entirety. This interconnection can readily be made recognizable by unwrapping the mixer structures 1 along their extent into a plane. Such unwrappings are shown in FIGS. 2-7 to 2-9. The two lateral margins, which extend parallel to the z-axis, are respectively formed by the string B with the chambers B1 , B2, B3, . . . in FIG. 2-7, by B1 , T‘, B2 , . . . in FIG. 2-8 and by B1 , ST, B2 , . . . in FIG. 2-9.

The meander-like lines in FIGS. 2-7 to 2-9 represent the outer wall edges of the mixer structures 1. The outer comers of the deflection plates 3, 3‘ (FIG. 2-1) are not marked; they each lie in the middle of the horizontal stretches of the meander-like lines. The flow of the mixing material is indicated by arrows: inclined arrows at the entry points of the chambers, horizontal arrows at the exit points. In FIG. 2-7 (cf. FIG. 2-1) all chambers are equivalent; they are mixing-active chambers.

In FIG. 2-8 the chamber arrangements S1-T-S2' and ST-T-S2 are particularly noteworthy (cf. FIG. 2-5). In FIG. 2-9 the chamber arrangements S1-S2' and ST-S2 are particularly noteworthy (cf. FIG. 2-5).

FIG. 2-10 shows a further preferable means.

It is as follows: most of the passages between adjacent mixing-active chambers are laterally bounded by the tube 10; for directing the flow, some individual passages are each bounded by a rib 11 arranged at the tube 10. Mixing material that flows along the tube wall is deflected into the interior of the tube 10 by these ribs 11. The mixing quality is thereby improved.

Since, as a rule, highly viscous media are treated by the mixer, large pressure gradients arise in the direction of the Z-axis of the mixer structure 1. These pressure gradients decrease when the wall thicknesses are made smaller. If the walls of the mixer structure 1 are thin, however, there is the danger that the structure will be crushed. The mixer structure 1 can be brought into a more stable form with suitable reinforcement means. FIGS. 2-11 and 2-12 show reinforcements by strips 12 and 13 which are arranged at the periphery of the mixer structure 1 in the Z-direction. Such reinforcements can naturally also be provided for mixer structures which contain no re-layering chambers.

FIGS. 2-1 to 2-12 relate to mixers whose mixing-active chambers are arranged in four strings. A mixer of this kind corresponds to the first exemplary embodiment which is described in the named U.S. application Ser. No. 08/660,434; it is shown again in FIG. 2- 13 in the schematic form of representation chosen there. The two other exemplary embodiments are shown in FIGS. 2-14 and 2-15.

In FIG. 2-13 the two upper planes represent the boundaries between adjacent axial sections which have the mixing elements. Each of them has two open subsurfaces as well as two subsurfaces covered by deflection plates 3, 3‘; and the open subsurfaces 4, 4‘ are arranged to be mutually displaced. The lower plane specifies the designations A, B, C and D of the four chambered strings. Corresponding remarks hold for the mixers of FIGS. 2-14 and 2-15.

Mixers in accordance with FIG. 2-14 contain bundles with nine strings arranged in the direction of the tube, with six of these strings, namely A, C, B, D, B‘ and C‘, comprising mixing-active chambers and the remaining three strings, which are not designated, containing intermediate chambers which produce indirect connections between mixingactive chambers. The intermediate chambers arranged in the corner strings each have - like the above named transfer chambers T and T‘ - two passages to adjacent chambers. The intermediate chambers of the central string each contain four such passages, which are arranged in ring shape.

Mixers in accordance with FIG. 2-15 contain bundles with sixteen strings arranged in the direction of the tube, with eight of these strings, namely A, C, B, D, A‘, B‘, C‘ and D‘, comprising mixing-active chambers and the remaining eight strings containing intermediate chambers which produce indirect connections between mixing-active chambers. The intermediate chambers again each have two or four passages to adjacent chambers as in the embodiment of FIG. 2-14. In the following, embodiments of a supplementary third aspect will be described with reference to the FIGS. 3-1 to 3-17:

FIG. 3-1 illustrates a detail of a first exemplary embodiment of a mixer 1 that comprises a number of identical mixing elements 2, 2’, and 2”, which are superimposed on one another while each successive element is rotated by 180° with respect to the longitudinal centre axis. Mixing enclosure 3 is schematically shown at one end.

Seen in the flow direction, i.e. from the bottom of the drawing, one end of each individual mixing element 2 comprises a transversal edge 8 of a transversal guide wall 8‘ that is followed by two end sections 6 and 7 extending perpendicularly thereto and including complementary lateral openings 11 and 12, and by a bottom section 9 and a complementary bottom section opening 10, the latter extending between two guide walls 4‘, 5‘ each of which ends in a respective separating edge 4, 5, where the guide walls are aligned in parallel with the longitudinal centre axis. In the present example, the end sections extend over half the length of the separating edges. The openings, resp. their crosssectional areas, and the length of the webs essentially determine the pressure drop between the inlet and the outlet of the mixer.

The mixing element 2‘ following mixing element 2 comprises the same components and structures, but it is superimposed on first mixing element 2 in a position rotated by 180° with respect to the longitudinal axis. The following mixing elements are also identical to mixing element 2 and arranged one after another while rotated by 180° each as seen in the longitudinal direction. The flow direction is indicated by arrow 13.

FIG. 3-2 indicates the distribution of the two components G and H at the mixer entrance, each component being supplied from a container of a double cartridge or a dispensing appliance having separate outlets, see FIG. 3-13. In the present example, according to the flow direction, the mixer entrance is shown at the bottom. After their entrance on either side of transversal edge 8, the components G and H spread along transversal guide wall 8‘ and are divided into three streams by guide walls 4‘, 5‘, so that six streams AG, BG, CG and AH, BH, and CH are finally produced, to which respective chambers DG, EG, FG; DH, EH, FH may be associated in the mixer. During further dispensing, the six streams reach the following mixing element 2‘. In the process, on one side of the transversal edge, the mixed and spread streams AG, BG, and CG are displaced through lateral openings 11 and 12, and on the other side of the lateral edge, the spread streams AG, BH, GH are displaced through bottom opening 10, as indicated in FIG. 3-3 schematically. Thus, at the end of element 2, the mixed streams A1.G and C1.G with B1.G as well as A1.H and C1.H with B1.H=A1.1 and C1.1 with B1.1 and A1 .2 and C1.2 with B1 .2 are obtained according to the diagram of FIG. 3-3. After having reached the second mixing element 2‘, the mixed streams spread on either side of the lateral edge.

Then, the mixed and spread streams A2.1 , B2.1 , and C2.1 are displaced outwards through lateral openings 11 and 12, and the mixed streams A2.2, B2.2, and C2.2 are displaced inwards through bottom opening 10, as follows from FIG. 3-3, whereupon these streams are spreading again.

In the next step, the displacement occurs in the other direction, i.e. streams A3.1 , B3.1 and C3.1 are displaced inwards and A32, B 3 2 and C3.2 outwards, as shown in FIG. 3-3 as well. Again, when entering the following element, the components spread on both sides of the lateral edge and are subsequently displaced again to reach the following mixing element.

The arrangement and the construction of the mixing elements result in a three phase sequence of the mixing process, in which the composition is first divided, then spread and subsequently displaced, only to be divided, spread, and displaced again in the following step.

This is shown in the diagram of FIG. 3-4, in which the three steps of dividing, displacement and spreading are illustrated in three stages. In the diagram of FIG. 3-4, separating is symbolized by I, displacement by II, and spreading by III, while the three mixing elements resp. mixing stages are designated by 2, 2’, 2”. This diagram clearly shows that in mixing element 2, the two components G and H are first divided into two and subsequently into three respective streams, i.e. into six streams AG, BG, CG and AH, BH, GH, then on the one side three mixed streams are displaced through the two lateral openings as two streams and on the other side the three other mixed streams are displaced through bottom opening 10 to form a single stream, and then again to be spread as three mixed streams. In an alternative embodiment for a larger mixer, more than two separating edges and guide walls may be provided, e.g. three separating edges and guide walls, which in the case of two components divide the material into more than six streams, while the bottom walls resp. openings are arranged in alternate directions resp. mutually offset. Also, as in the preceding example, a transversal edge is provided, so that the streams are divided into two portions. The result is an analogous configuration of a mixing element comprising more than one transversal edge and more than two separating walls.

Alternatively, it is also possible to operate the mixer in the reversed direction with respect to the flow direction, so that the material first reaches the separating edges rather than the transversal edge. Thus, the composition is first divided into three parts and then, during its passage through the two openings, into two parts. In this inverse flow direction, the two outer streams unite and spread on one half of the transversal edge while the two middle streams unite and spread on the other half of the transversal edge.

In FIGS. 3-5 to 3-8, mixer 1 is reversed by 180° with respect to FIG. 3-1 while the flow direction remains the same. For a better understanding, the individual components of the mixing element are listed again. At one end, seen from below in the direction of flow, the individual mixing element 2 comprises two separating edges 4 and 5 pertaining to respective guide walls 4‘, 5‘, which are aligned in parallel to the longitudinal center axis and comprise, perpendicularly thereto and on either side of the guide walls, two end sections 6 and 7 and a bottom section 9 situated between the guide walls and extending over half of the guide walls. Perpendicularly to the end sections, at the center of the guide walls, a transversal guide wall 8‘ is arranged which comprises a transversal edge 8 at the other end of the mixing element.

The two end sections and the bottom section are complementarity associated with bottom section opening 10 between the guide walls and with the two lateral openings 11 and 12 on either side of the guide walls. The openings, resp. their cross-sectional areas, essentially determine the pressure drop between the inlet and the outlet of the mixer.

The mixing element 2‘ following mixing element 2 comprises the same components and structures and is disposed on first mixing element 2 in a position rotated by 180° with respect to the longitudinal axis. Likewise, the following mixing elements are also arranged one after another in positions rotated by 180° each with respect to the longitudinal axis. The flow direction is indicated by arrow 13.

In FIG. 3-5, the distribution of the two components G and H at the mixer inlet is indicated, each component being supplied from a container of a double cartridge or a dispensing appliance having separate outlets, see FIG. 3-13. In the present example, according to the flow direction, the mixer inlet is shown at the bottom. When entering the first mixing element 2, the two components are divided by separating edges 4 and 5 into six streams AG, BG, CG and AH, BH, and CH.

During further dispensing, the six streams reach the following mixing element 2‘. In the process, the respective pairs of streams A1.G and A1.H, B1.G and B1.H, and C1.G and C1. H=A1.1 and A1 .2, B1 .1 and B1 .2, and C1.1 and C1 .2 are mixed with one another according to FIG. 3-7 while due to the geometrical structure of mixing element 2, stream A1.1 displaces stream A1.2 to reach the following mixing element through lateral opening 11 , stream B1.2 displaces stream B1.1 to reach the following mixing element through bottom section opening 10, and stream C1.1 displaces stream C1 .2 to reach the following mixing element through lateral opening 12. When they arrive at the second mixing element 2‘, the mixed streams B2.1 and B2.2 spread on one side of transversal edge 8 on the entire half A2.1-B2.1-C2.1 , and likewise, the two mixed streams A2.1 , A2.2 and C2.1 , C2.2 spread on the other side of transversal edge 8 on the half A2.2, B2.2, and C2.2 shown at the front of the Figure.

In the next step, a displacement in the other direction results, i.e. stream B2.1 displaces stream B2.2, stream A2.2 displaces stream A2.1 , and stream C2.2 displaces C2.1 , as appears in FIG. 3-3 as well. Again, when entering the following mixing element, the components spread on a respective half and are subsequently displaced again to reach the following mixing element.

Here also, the arrangement and construction of the mixing elements result in a three phased sequence of the mixing process in which the composition is first divided, then displaced and finally spread, only to be divided, displaced, and spread again in the following step.

This follows from the diagram of FIG. 3-8, in which the three steps of dividing, displacing, and spreading are illustrated in three stages. In the diagram of FIG. 3-8, separating is symbolized by I, displacing by II, and spreading by III, while the three mixing elements as well as the corresponding mixing stages are designated by 2, 2’, 2”. This diagram clearly shows that in mixing element 2, the two components are divided into six streams, then a respective stream displaces the other one to spread towards the second mixing element 2‘ in such a manner that the central streams form one half on one side of transversal edge 8 and transversal guide wall 8‘ while the two outer pairs of streams jointly form the other half on the other side of the transversal edge and the transversal guide wall.

The mixers described above not only provide an intimate mixing of the materials but first of all a lower pressure drop as well as reduced dead volumes as compared to other mixers mentioned in the introduction.

Based on this simplified discussion of the schematic mixing operations, the following variations are possible: In these exemplary embodiments, mixers having rectangular resp. square cross-sections have been described, and the two impinging components have the same cross-sectional area. However, this need not always be the case, but any cross-sectional, resp. volume stream ratio of the two components G and H may be chosen at the inlet section, e.g. between 1 :1 and 1 :10, whereby the dimensions of the mixing elements remain the same. It is however possible to envisage specially adapted mixing elements. This means that the transversal edge need not be arranged on the center line of the mixing element. The same applies to the distance between the separating edges and the guide walls.

Furthermore, the separating edges and guide walls may be arranged at a mutual angle, and likewise, the end sections and the bottom section as well as the transversal edge may be arranged at a mutual angle, so that the openings are not necessarily rectangular or square. Also, the edges, e.g. the transversal edge, may incorporate a bend. The mixing elements need not be arranged one after another in positions rotated by 180°, but any angle from 0° to 360° is possible.

It is also possible to arrange the previously described mixing elements in an enclosure having a cross section other than rectangular, e.g. in a round, an orbicular, resp. cylindrical, a conical, or an elliptic enclosure.

Whereas the previously described mixing elements provide good mixing properties, the walls arranged at an angle still include dead volumes giving rise to cured material in spite of the improved design. A further reduction of the dead volume is provided by a mixer having mixing elements with curved walls. A mixer of this kind is represented in FIGS. 3- 9 to 3-12.

FIG. 3-9 shows a mixer 14 with a regular cylindric housing as a particular case of a round mixer having mixing elements with curved walls, including mixing elements 15, 15‘, and 15” and enclosure 16. In analogy to the first mixer 1 , at one of its ends, i.e. at the bottom as seen in the flow direction, mixing element 15 comprises a transversal edge 21 where two guide walls 17‘, 18‘ originate which end in respective separating edges 17, 18. The guide walls each comprise a respective end section 19 and 20 with lateral openings 24, 25, a bottom section 22, and a complementary bottom section opening 23.

The individual sections are not as clearly demarcated here as in the first exemplary embodiment. In contrast to the rectangular mixing element 2, the two guide walls 17‘, 18‘ form a curved and continuous transition between separating edges 17 and 18 situated at one end thereof and transversal edge 21 at the other end. This curved configuration of the guide walls, resp. their transition to the transversal edge appears in FIG. 3-9, the schematized transition being shown in FIG. 3-12.

The operation of this second exemplary embodiment is the same as in the first example. In analogy to the latter, the material stream consisting of the two components G and H is divided into a total of six streams AG, BG, CG, AH, BH, and CH as it leaves the first mixing element 15.

In this example, the mixing operation is effected in analogy to the first exemplary embodiment, whereas the guide walls are no longer arranged in a sharp, rectangular disposition but run towards each other in a V-shaped configuration and have a curved shape. The mixing principle according to FIG. 3-11 is the same as in the first example, i.e. the central stream BG=B1.1 in FIG. 3-11 mixes with the two other streams AG=A1.1 in FIG. 3-11 and CG=C1 .1 in FIG. 3-11 and is displaced through lateral openings 24, 25, and spreads while on the other side of the transversal edge, the two outer streams AH=A1.2 and CH=C1.2 mix with central stream BH=B1.2 are displaced through bottom section opening 23, and spread. Due to the curved construction and the V-shaped arrangement of the guide walls, dead volumes are substantially reduced, thereby resulting in reduced losses. On the other hand, this arrangement results in a further reduced pressure drop. It is conceivable in this exemplary embodiment that the two guide walls 17‘, 18‘ are provided at the transition to transversal wall 21 with an additional web 152 disposed in the longitudinal axis and transversally to the transversal wall, which would theoretically divide the material into three rather than two parts at the exit near the transversal wall, see FIG. 3-14 illustrating a mixing element 151. However, such an additional web offers no advantages but rather the inconvenience that the material may not spread on that side. It is also possible to provide such a web in the first, rectangular mixer, i.e. below floor 9 and along transversal edge 8. However, the following considerations and the claims do not take account of this additional partition.

Also, the diagram of FIG. 3-12 will be interpreted in analogy to the diagram of FIG. 3-4 with the difference that the perpendicular guide walls 4‘, 5‘ provided according to FIG. 3- 4 are V-shaped here and end in the transversal edge.

In analogy to the first example, the cross-sectional, resp. volume stream ratios of the components G and H may be different from 1 :1 , and most importantly, the guide walls leading from the separating edges to the transversal edge may assume a multitude of geometrical shapes while the mixing elements may be reversed to the shown arrangement with regard to the flow direction. Also, the mixing principle is the same in each case, i.e. the central streams mix with each other and spread on one side of the transversal edge, and then the two outer pairs of streams spread on the respective other side of the transversal edge. Furthermore, the successive mixing elements need not necessarily be rotated by 180° each with respect to the longitudinal axis as shown in FIG. 3-9 but may be disposed in any orientation.

In the exemplary embodiment of FIG. 3-13, a novel mixer arrangement is shown which achieves particularly good results with the described mixing elements. FIG. 3-13 shows a mixer 36, mixer enclosure 16 and the mixer entrance with inlets 32 and 33 and outlet openings 34 and 35. As in the mixers of the prior art using mixing helixes, entrance edge 31 of the first helix mixing element 28 extends transversally across the two outlet openings 34, 35. The two separating edges of first mixing element 15 of first mixing group 27 are disposed transversally to outlet edge 30 of the first helix mixing element. The first mixing group 27 consists of the mixing elements 15, of which four are illustrated here by way of example. This group is followed by the second helix mixing element 28‘ , which in turn is followed by a second mixing group 27‘. This second mixing group also consists of four mixing elements 15‘, which however are reversed by 180° in the direction of flow against the first mixing group, i.e. with the transversal wall directed towards the inlet, whereby this group has a similar effect as that of FIG. 3-9.

Furthermore, it follows from FIG. 3-13 that transversal edge 21 of the last mixing element of each mixing group is perpendicular to entrance edge 31 ‘ of mixing helix element 28‘. The periodical insertion of a mixing helix element serves the purpose of efliciently peeling the material from the walls and of re-layering it, thereby providing a further improvement of the mixing efficiency.

In FIG. 3-13, three mixing groups and three mixing helix elements are shown, but it is understood that the number of mixing groups and mixing elements may vary according to the intended purpose. Thus, both the number of mixing elements per mixing group and the number of mixing helix elements between the mixing groups may vary. All considerations concerning the mixing operation and the application of conventional mixing helixes also apply for the homogenization of materials and for mixing arrangements using mixing elements according to FIG. 3-15.

The exemplary embodiment of FIGS. 3-15 to 3-17 is based upon the exemplary embodiment of FIG. 3-1 with straight element walls, the mixing elements however being arranged in a regular cylindrical housing. In this exemplary embodiment, several features are indicated which provide both an improvement of the mixing action and a reduction of the dead volumes resp. of the losses associated therewith, and thus allow a substantially increased overall efficiency. It is understood that not all of these features need be provided in all mixing elements or mixing groups at the same time.

FIG. 3-15 shows a mixing element arrangement 40, whereby the housing is not shown, including inlet portion 41 with inlets 42, 43 and outlets 42‘ , 43‘ as well as mixing section 44 with the mixing elements. Up to the first transversal edge 45, the components are separated by a separating wall 46. In this exemplary embodiment, five mixing elements 47a-47e are integrated in a first mixing group 47, while the second mixing group 48 comprises two mixing elements 48a and 48b and the following mixing group 49 again includes five mixing elements 49a-49e.

Using the mixer according to FIGS. 3-1 , 3-15 or 3-17 it may be advantageous to provide that the height ZL of guide walls 50, 51 , which are reached by the material after the transversal guide wall, is greater than the height ZQ of the transversal guide walls, e.g. by a preferred factor comprised between 1.1 and 2.0, more particularly 1.5. This lengthening of the double guide walls provides an improved alignment of the material, which is thereby allowed more time to spread before being divided again. Furthermore, the lengthening of the double guide walls results in a reduction of the number of mixing elements required to achieve an equal or better mixing quality.

In analogy, when using the mixer according to FIG. 3-5 in the reversed flow direction it may be advantageous to provide for a greater height ZQ of the transversal guide wall, reached after the guide walls by the material, than the height ZL of the guide walls, also with a preferred ratio of 1.1 to 2.0, in particular 1.5.

A second feature common to all mixing elements are measures for reducing the dead zones, which are particularly important in the case of straight walls and cause volume losses and local curing of the material. To this end, such dead zones are filled in. Different dead zone obturations TZV are indicated especially in FIG. 3-17. Thus, bottom section 9 comprises dead zone obturations TZV1 of a first type that are directed towards the preceding mixing element. The mixing elements having no inclined webs, i.e. mixing elements 47a-47e and 49a-49e, also comprise dead zone obturations TZV2 on the inwardly facing sides of the bottom sections. On the outside of guide walls 50 and 51 a third and fourth type of dead zone obturations TZV3 and TZV4 are provided in those locations where no inclined webs are present.

At straight walls, wall layers are formed that cause layer defects during layer formation. For the detachment of such layers, for the promotion of the longitudinal mixing action in the direction of the double guide walls, and for equalizing the concentrations, inclined webs are provided on the inside and on the outside of the guide walls.

In the mixer of FIGS. 3-15 and 3-17, these inclined webs are attached to the central mixing group 48 where internal inclined webs 52 and external inclined webs 53 are visible, both of which are attached to guide walls 50 and 51 of mixing elements 4851 and 48b.

Wall layers appear not only on the guide walls but also on the inner wall of the mixer enclosure. To optimize the layer formation, longitudinal webs are provided which connect the double guide walls on the outside. The longitudinal webs need not be provided in all mixing groups. In the exemplary embodiment of FIGS. 3-15 and 3-17, the longitudinal webs 54 are attached to the first and second mixing groups 47, 48, but they might as well be attached to the third or to any other mixing group, or alternatively in the same way as in mixing group 48.

The suggested measures resp. features are preferably used jointly, but embodiments where only some of the measures are applied are conceivable too.

The flow diagram of the mixing operation is shown in FIG. 3-16.

At A, the two components spread on the respective side of transversal guide wall 55. At B, the portion on the right side moves towards the center and spreads over the entire length of guide walls 50, 51 while the portion on the left side divides into two halves and forms the outer two thirds. At C, these three streams are divided transversally. At D, the left half is guided towards the center and spreads over the entire length of the guide walls while the portion on the right side is divided and the halves reach respective sides of the guide walls, whereupon a transversal edge follows again, etc.

The main features are applicable in the simplified case where the transversal edges and guide walls do not comprise any webs as web 152, which do not change the general mixing principle of the mixing elements. Moreover, the definition of a transversal wall includes a possible duplication of the transversal edge into two parallel transversal walls as this does not change the mixing principle either.

In the following, embodiments of a supplementary fourth aspect will be described with reference to the FIGS. 4-1 a to 4-10:

In the following the same reference numerals will be used for parts having the same or equivalent function. Any statements made having regard to the direction of a component are made relative to the position shown in the drawing and can naturally vary in the actual position of application.

FIG. 4-1 a shows a side view of a first type of static mixer 10 having a first type of mixer housing 12. The mixing element 16 (see FIG. 4-1a) and part of the mixer inlet section 14 (see FIG. 4-1 b) are arranged within the mixer housing 12. One inlet 18a into the mixer inlet section 14 can be seen, as can alignment means 20a, 20b by means of which the mixer inlet section 14 is aligned relative to a cartridge 100 (see FIG. 4-9).

FIG. 4-1 b shows a section through the static mixer 10 of FIG. 4-1 a when the static mixer 10 is rotated by 90° about the longitudinal axis A. Both of the inlets 18a, 18b into the mixer inlet section 14 can be seen in this position. Furthermore, the mixing element 16 is arranged within the mixer housing 12.

FIG. 4-2 shows various views of the mixer inlet section 14 of FIG. 4-1. FIG. 4-2a shows a top view of the mixer inlet section 14. The mixer inlet section 14 has a generally circular shape in the top view. The mixer inlet section 14 has two outlets 22a, 22b each having an outlet opening 24a, 24b. A counter plug element 26 is arranged between the outlets 22a, 22b. In the present example the counter plug element 26 is configured as a socket.

The counter plug element of FIG. 4-2a is formed by a first groove 26a and a second groove 26b extending transverse thereto. Noses 28 are disposed within the first and second grooves 26a, 26b. The noses 28 are adapted to cooperate with a plug element 30 (see FIGS. 4-3a to 4-3c) such that they frictionally engage the plug element 30 to fix the plug element 30 relative to the counter plug element 26.

The counter plug element 26 is configured such that the plug element 30 can only be inserted in one direction into the mixer inlet section 14. Thereby the shape of the counter plug element 26 acts as coding means for the insertion of the generally T-shaped end of the plug element 30.

The outlet openings 24a, 24b are respectively formed in an output surface 32 of the mixer inlet section 14. Adjacent to the outlet opening 24b a recess 34 is formed within the outlet 22b. The recess 34 expands a volume of the outlet 22b relative to the inlet 18b.

The recess 34 has an elongate shape and thereby enlarges and directs a flow path of a component 102b (see FIG. 4-10), flowing from the inlet 18b to the outlet 22b. The recess 34 thereby acts as a guide reservoir for the component 102b that flows into the mixing element 16. The guide reservoir enables the component 102b to be directed into inlets 36 (see FIGS. 4-3a to 4-3c) of the mixing element 16, so that an ideal point of entry for the component 102b into the inlets 36 can be selected.

In order to improve the introduction of the components 102a, 102b into the mixing element 16, the outlets 22a, 22b of the mixer inlet section 14 are spaced less far apart than the corresponding inlets 18a, 18b.

The outlet opening 24a is approximately a tenth of the size of the outlet opening 24b. This is because the mixer inlet section 14 is used for multi-components having a medium to high mixing ratio such as 4:1 and 10:1 , this means that one of the components is introduced into the mixing element at a ratio of 4:1 or 10:1 with respect to the other component.

FIG. 4-2b shows a bottom view of the mixer inlet section 14. The inlets 18a, 18b have a substantially circular shaped inlet opening 38a, 38b. The shape of the inlet opening is selected so that the inlets 18a, 18b can be connected to outlets of a cartridge 100 (see FIG. 4-10).

The inlets 18a, 18b are in fluid communication with the respective outlets 22a, 22b, so as to guide components from the cartridge 100 to the mixing element 16.

The alignment means 20a, 20b are used in order to align the mixer inlet section 14 with the cartridge 100. In order to connect the mixer inlet section 14 of the static mixer 10 to the cartridge 100 in a coded and aligned manner the alignment means 20a, 20b have a different size so that these can only be positioned in one way. Moreover, the alignment means 20a, 20b have a generally T-shaped cross-section for this purpose. Attachment means (not shown) such as a retainer nut can additionally be used to, at least intermittently fixedly, connect the static mixer 10 to the cartridge 100.

Having regard to the high ratio mixer inlet section, the inlets 18a, 18b are also of different size so that these can only be placed on to the cartridge 100 in one way and thereby also act as coded alignment means.

FIG. 4-2c shows a side view of the mixer inlet section 14 of FIG. 4-2a. The outlets 22a, 22b of the mixer inlet section 14 are connected to one another via a volume forming at least a part of the counter plug element 26. Once the plug element 30 cooperates with the counter plug element 26, the outlets 22a, 22b are separated from one another by means of the plug element 30 (see FIG. 4-4).

Moreover, one can see a side view of the generally T-shaped alignment means 20a, 20b in FIG. 4-2c.

The mixer inlet section 14 has a projection 40 arranged adjacent to the output surface 32. This projection is adapted to cooperate with a groove 42 (see FIG. 4-1 b) arranged in the mixer housing 12 in order to latch the mixer housing 12 to the mixer inlet section 14.

FIG. 4-2d shows a section through the mixer inlet section 14 along the sectional line 8-8 of FIG. 4-2c. The outlet 22b is arranged such that at least a part of the outlet opening 24b is arranged around the longitudinal axis A of the static mixer. Thereby the component is guided from the inlet 18b to the mixing element 16.

One can see how the flow path 44b between the inlet 18b and the outlet 22b is directed towards the longitudinal axis A. Through the provision of the recess 34, the diameter of the flow path 44b (the same is true in analogy for the flow path 44a) experiences no constrictions in the region of the outlet 22b. This is because a distance between the mixer housing 12 and the recess 34 is selected such that the diameter of the flow path 44b is kept at least substantially equal throughout the mixer inlet section 14 and up to the mixing element 16. For this reason, the flow of the component 102b experiences significantly less flow resistance on its passage through the mixer inlet section 14 up to the mixing element 16 on being discharged from the cartridge 100 in comparison to prior art static mixers (not shown). Likewise, the flow path 44a between the inlet 18a and the outlet 18 b is shifted towards the longitudinal axis A.

FIG. 4-2e shows an enlarged view of the generally T-shaped counter plug element 26. The outlets 22a and 22b are connected to one another via the counter plug element 26. The connection is closed once the plug element 30 is inserted into the counter plug element 26 (see FIG. 4-4). Furthermore, four noses 28 are visible in the region of the first groove 26a. The four noses 28 are configured to engage the corresponding plug element 30. FIGS. 4-3a to 4-3c show various views of a first type of mixing element 16. The mixing element 16 comprises mixer elements 46 for separating the material to be mixed into a plurality of streams, as well as means for the layered merging of the same. The means comprise transverse edges 48 and guide walls 50 that extend at an angle to the transverse edges 48, as well as guide elements 52 arranged at an angle to the longitudinal axis A and provided with openings.

The individual mixer elements 46 are connected to one another by struts 54, with the struts 54 also acting as further guide and deflecting walls. The number of mixer elements 46 and the corresponding length of the struts 54 is selected in dependence on the kind of material that is to be dispensed with a certain static mixer 10. For some applications five mixer elements 46 may be sufficient whereas for others ten or more mixer elements 46 may need to be connected to one another by means of struts 54.

FIG. 4-3a shows a side view onto the mixing element 16. At the right hand side of the mixing element 16, there is a plug element 30. This is composed of a wall section 56. Some of the wall section 56 has a U-shaped cross-section that leads into a T-shaped cross-section. A groove 58 is formed in the wall section 56 that extends from the T- shaped cross-section through the U-shaped cross-section and towards an inlet 36 of the mixing element 16.

FIG. 4-3b indicates how this groove extends from a surface 60 of the plug element 30 towards the inlet 36 of the mixing element 16. The groove thereby extends the flow path 44a from the mixer inlet section 14 into the mixing element 16 (see also FIG. 4-4 in this regard).

FIG. 4-3c like FIG. 4-3b shows how the T-shaped wall section 56 is formed by a first wall 62 and a second wall 64 extending transverse thereto. The groove 58 is formed extending from the surface 60 within the second wall 64 towards the inlet 36 of the mixing element 16.

FIGS. 4a and 4b show perspective part views of the first type of static mixer 10. In particular one can see how the flow path 44a extends from the inlet 18a of the mixer inlet section 14 via the outlet 22a and the groove 58 towards one of the inlets 36 of the mixing element 16. Likewise, the flow path 44b extends from the inlet 18b via the outlet 22b of the mixer inlet section towards inlets 36 of the mixing element 16. The flow path 44a is smaller in diameter than the flow path 44b, as the mixer inlet section 14 and the mixing element 16 currently employed are used for high mixing ratios of e.g. 4:1 and 10:1.

Moreover, the section shown in FIG. 4-4a indicates how the flow path 44b is enlarged in the region of the outlet 22b in comparison to the inlet 18b. This enlargement of the flow path 44b is further highlighted in FIG. 4-4b where one can see how the flow path 44b extends around the second wall 64 up to the first wall 62 of the wall section 56 of the mixing element 16. The flow path 44b is extended such that it comes into contact with substantially the whole width of the mixing element 16 in the region of the inlets 36 where it extends around the second wall 64. The region of the outlet 22b is arranged such that the component 102b flowing through the flow path 44b arrives in a directed manner at the inlet 36 of the mixing element 16.

Both FIGS. 4-4a and 4-4b show that the flow paths 44a, 44b are shifted with respect to the longitudinal axis A from the inlets 18a, 18b towards the longitudinal axis A in the regions of the outlets 22a, 22b. Thereby the components 102a, 102b flow into the mixing element 16 in a more directed manner and can be introduced into the mixing element 16 in an optimum way, so that a mixing result is improved. This also leads to a reduction in the length of the mixing element 16 and hence to a reduction in the residual volume remaining in the static mixer 10.

Moreover, the shift of the flow paths 44a, 44b takes place within the mixer inlet section 14, so that a spacing between the mixer inlet section 14 and the mixing element 16 can be reduced leading to a further reduction in the residual volume remaining in the static mixer 10. This is advantageously achieved in a mixer inlet section 14 having the same height as prior art mixer inlet sections (not shown).

FIG. 4-5 shows a second type of static mixer 10 in a second type of mixer housing 12. The mixer is typically used for low ratio mixing of components such as 1 :1 or 2:1 .

FIG. 4-6 shows a second type of mixer inlet section 14 designed for 1 : 1 and 2:1 mixing ratios. FIG. 4-6a shows a bottom view of the mixer inlet section 14 in which the inlets 18a, 18b and the corresponding inlet openings 38a, 38b are of equal size. FIG. 4-6b shows a top view of the mixer inlet section 14 in which the outlets 22a, 22b and the corresponding outlet openings 24a, 24b are of equal size. A counter plug element 26 having only a first groove 26a extends between the outlets 22a, 22b. A recess 66 is arranged at an end of the first groove 26a. This recess 66 is adapted to cooperate with a bulge 68 (see FIG. 4-7) configured at the plug element 30 of the mixing element 16.

As the outlets 22a, 22b have the same size, the side view of FIG. 4-6c appears to have a continuous outlet opening 24a, 24b. As can be seen from FIG. 4-6d this is because the mixer inlet section 14 has a free space extending into the recess 34 and adjacent to the first groove 26a into which free space the plug element 30 of the mixing element 16 is inserted to separate the outlets 22a, 22b from one another so that a mixing of components only takes place once the components enter the mixer elements 46 of the mixing elements 16.

Like with the outlet 22b of FIG. 4-2, both of the outlets 22a, 22b have a recess 34 adjacent to the output surface 32. This recess 34 expands a volume of the respective outlet 22a, 22b in an elongate way to form a component flow guide region adjacent to the output surface 32. The component flow guide region acts as a region in which the components 102a, 102b can flow into the inlets 36 of the mixing element 16 in a directed manner. In order to complement the directed flow of the components a shape of an inlet surface of the mixer housing 12 is adapted to the shape of the output surface 32 of the mixer inlet section 14. In the present example the output surface 32 has a part spherical shape.

As can be seen in the section of FIG. 4-6d, the inlets 18a, 18b start merging into the outlets 22a, 22b at approximately a third of the length between the inlet openings 38a, 38b and a top most part of the outlet openings 24a, 24b. The outlets start at approximately two third of a length between the inlet openings 38a, 38b and a top most part of the outlet openings 24a, 24b. The same is true for the example shown in FIG. 4-2.

FIG. 4-6e shows an enlarged view of the region of the first groove 26a. A nose 28 is visible within the recess 66. This, like the other noses 28 configured in the first groove 26a, is designed to frictionally engage the wall section 56 of the plug element 30 when the plug element 30 cooperates with the counter plug element 26. FIGS. 4-7a to 4-7c show perspective views of a second type of mixing element 16. The mixer elements 46 of the mixing element 14 are configured like the embodiment shown in FIGS. 4-3a to 4-3c. The difference is to be seen in the wall section 56 of the plug element 30.

The wall section 56 shown in the side view of FIG. 4-7a has a generally planar shape with a bulge 68 configured at an end thereof. The bulge 68 is configured so that it extends substantially in parallel with the longitudinal axis A.

FIG. 4-7b shows a further side view when the mixing element 14 is rotated by 90° about the longitudinal axis A. One can see how the wall section 56 has a thinner diameter in comparison to the bulge 68.

FIG. 4-7c shows a further rotation of the mixing element 14 by 90° about the longitudinal axis A. Now the bulge 68 is positioned at the top of the wall section 56 of the plug element 30. The bulge 68 is a coded alignment means, so that the plug element 30 can only be plugged into the counter plug element 26 of the mixer inlet section 14 of FIG. 4-6 in one way.

FIG. 4-8 shows perspective part views of the second type of static mixer 10. Both flow paths 44a, 44b are directed from the inlets of the mixer inlet section 14 to the inlets 36 of the mixing element 16. Thereby a geometric center of the outlet openings 24a, 24b is spaced less far from the longitudinal axis A than a geometric center of the inlet openings 38a, 38b to direct the flow path 44a, 44b of the components 102a, 102b towards the inlets 38.

FIG. 4-9 shows a dispensing apparatus 98 comprising a multi-component cartridge 100 and a static mixer 10. The multi-component cartridge 100 is filled with respective components 102a, 102b. The components 102a, 102b can be discharged from the cartridge 100 by means of a plunger (not shown) into the inlets 18a, 18b of the mixer inlet section 14 of the static mixer 10. The static mixer 10 is connected to the cartridge 100, on the one hand, by means of the alignment means 20a, 20b for a coded alignment between the static mixer 10 and the cartridge 100. On the other hand, the static mixer 10 is connected to the cartridge 100 by a retainer nut (not shown). The retainer nut is adapted to cooperate with the cartridge 100 and engages the mixer housing 12 of the static mixer 10 in order to fix the static mixer 10 to the cartridge 100. FIG. 4-10a shows a schematic sectional view of a molding device Ma for a mixing element 16 as described herein. FIG. 4-1 Ob shows a sectional view of a molding device Mb for a mixer inlet section 14 as described herein. The molding devices have respective inputs for the components to be injected (not shown) and for any required vacuum apparatus (also not shown). In order to mold the specific components, inserts specific for any shapes of the components are also introduced into the molding devices Ma, Mb.

Using the molding devices Ma, Mb mixer inlet sections 14 and mixing elements 16 as described herein can be produced.

In the following, embodiments of a supplementary fifth aspect will be described with reference to the FIGS. 5-1 to 5-58:

FIGS. 5-1 and 5-2 show a mixer 1 comprising a mixer housing 2, a mixer element group 3, the mixer outlet 4 and a mixer inlet section 5 with two separated inlet parts 6 and 7, which are integral with a properly aligned separating element 3S of the mixer element group 3. This mixer is attached to the cartridge by matching the mixer different width bayonet lugs 10, 11 to the different width bayonet sockets 19, 20 while pressing the mixer onto the cartridge and by rotating the mixer housing 2. The separated inlet parts 6 and 7 and the mixer element group 3 with the separating element 3S do not rotate. Separating element 3S serving in this embodiment as a separating means for guiding each chemical component separatedly to the first dividing element 3D of the mixer element group 3.

The mixer housing is provided with longitudinal ribs 8 that end at the larger diameter 9 of the mixer housing 2. The two lateral ends of the ribs are formed as bayonet lugs 10 and 11 cooperating with the bayonet retaining means of the cartridge. As follows from FIG. 5- 2, the two lugs do not have the same width, lug 10 being larger than lug 11. As will be shown later, the different width of the lugs enable a coded alignment and attachment of the mixer to the cartridge.

The mixer element group 3 is connected to the separated inlet parts 6 and 7 and is disposed in such a way within the housing that the housing itself is rotatable around the mixer element group 3 with attached inlet parts 6 and 7, which are arranged at the inlet side of the first mixer element 3S serving in this embodiment as a separating means for guiding each component separately to the first dividing element 3D of the mixer element group 3.

In FIG. 5-3, the cartridge 12 comprises two cylindrical containers or chamber 13 of equal cross-sectional areas for a 1 :1 metering ratio ending in two individual, separate cylindrical and distal outlets 14 and 15. The outside shapes of the distal outlets 14 and 15 of the cartridge correspond to the respective inside shapes of the separate inlets 6 and 7 of the mixer, (see FIG. 5-1), whereby the inlets of the mixer fit over the outlets of the cartridge for tightly sealed connections. A reverse arrangement, where the inlet parts 6 and 7 fit into the outlet openings 14 and 15 is also possible.

In FIG. 5-4, the bayonet means 16 at the cartridge comprises a ring-shaped bayonet socket 17 with two internal recesses 18 and a circular opening with two diametrically opposed different width bayonet cutouts 19 and 20 for receiving the corresponding different width bayonet lugs 10 and 11 , (see FIG. 5-1), of the mixer, allowing coded introduction of the mixer in one predetermined position only. The flange parts 21 adjacent to the cutouts serve as bayonet retaining means for securing the lugs of the mixer.

The ring-shaped bayonet means provides, in particular, for increased strength of the bayonet retaining means and increased structural rigidity of the outlet end of the cartridge when, during dispensing, the hydraulic forces transmitted from the attached mixer are at a maximum. This arrangement is a substantial improvement in comparison with the prior art bayonet prongs.

FIGS. 5-5 and 5-6 show a variant to the embodiment shown in FIGS. 5-1 to 5-4 in that the containers 22 and 23 of cartridge 24 have different cross-sectional areas for metering ratios other than 1 :1.

In both described cases, in order to attach the mixer to the cartridge, the mixer can only be aligned with its bayonet lug widths corresponding to the different width cutouts of the bayonet sockets, then pressed onto the cartridge such that when the mixer is in place and the outlets and inlets are connected, the mixer housing 2 is rotated by 90° for the engagement of the bayonet lugs 10 , 11 in the bayonet retaining means 21 of the cartridge. This attachment method prevents contamination of one component by the other at the mixer-cartridge interface yet enabling a quick coded attachment of the mixer.

FIGS. 5-7 and 5-8 show in a second embodiment a mixer 25 comprising a mixer housing 26, a mixer element group 3, a mixer outlet 4, and a mixer inlet section 27. This mixer is fixed to the cartridge (see FIG. 5-9) with the aid of a separate coupling ring (see FIGS. 5-

11 and 5-12). The coupling ring 31 is provided with two bayonet lugs 32 and 33 corresponding to the bayonet cutouts 19, 20, respectively of the bayonet attachment means 16 at the cartridge. For better manual gripping, ribs 34 are provided on the outer cylindrical surface.

It follows in particular from FIG. 5-7 that the mixer inlet section 27 comprises two cylindrical, individual inlet openings 28, 29 at the inlet side face of the first mixer element 3S serving in this embodiment as a separating means for guiding each component separately to the first dividing element 3D of the mixer element group 3. A slot 30 provides for a coded alignment of the mixer in regard to a cartridge.

Cartridge 35 (see FIGS. 5-9 and 5-10) is the same as cartridge 1 of FIG. 5-1 with the exception that the bottom of the bayonet attachment means 1 6 comprises a nose piece 3 6 corresponding to the slot 30 at the mixer (see FIGS. 7 and 8) for coded alignment of the mixer.

When connecting the mixer to the cartridge, the nose piece 36 on the cartridge fits into slot 30 of the mixer inlet section 27. This coded connection method assures not only one alignment possibility but also axial mixer attachment without rotation of the mixer housing, thus preventing contamination of one component by the other at the cartridge/mixer interface.

There are other coding means possible at the dispensing apparatus or cartridge and at the accessory for the coded alignment of the accessory to the dispensing apparatus or cartridge, e.g. pins or protruding parts of all kind fitting into a recess or cavity or slot.

FIG. 5-13 shows a mixer 38 attached to a cartridge 75 having containers 76 and 77 with different cross-sectional areas, as a variant to the embodiment shown in FIGS. 5-5 to 5-

12 in that the mixer inlet section 37 of mixer 38 has a separating means within the mixer, which separating means comprises separated inlet chambers 39, 40, respectively having different cross-sectional areas, and lodged within a smaller combined diameter than the cartridge outlet with corresponding openings for each chamber for material to pass through.

The aforementioned separating means serves to maintain separation of the material flows up to the first dividing element 3D of the mixer element group 3. This separating means can have chambers with equal cross-sectional areas or have a cross-sectional area ratio other than 1 :1. For example, the ratio of the cross-sectional areas of the separating chambers can be adapted to the cross-sectional areas of the containers 76 and 77 of cartridge 75, respectively to its metering ratio. The separating means is fixedly connected to the mixer element group 3.

The cartridge 75 has the same attaching means as in FIGS. 5-5 and 5-6, and the mixer 38 is attached to the cartridge by means of the coupling ring 31 .

The embodiment according to the FIGS. 5-14 to 5-19 comprises a locking ring 51 that is snapped onto and permanently attached to the cartridge 42. The cartridge 42 comprises two cylindrical containers or chambers 43 of equal cross-sectional area, two distal outlets 45 and 46, and an attaching means 47 for attaching the locking ring 51 and for limiting its rotational movement. The form of the attaching means 47 is a circular edge 49 with two lugs 44 of same width and arranged around the two distal outlets with a circular undercut 48 at its base.

The locking ring 51 (see FIGS. 5-16A and 5-16B) and 17, snaps over circular edge 49 of the attaching means of the cartridge and remains attached to it. The locking ring 51 has an inner circular groove 52 forming a cartridge side edge 53 and a mixer side edge 54. The cartridge side edge 53 has two opposed cutouts 55, the width of which corresponds to the lugs 44 of the attaching, means whereby the inner diameter of the cartridge side edge 53 is slightly smaller than the outer diameter of the circular edge 49 of the attaching means of the cartridge. For snapping the locking ring to the cartridge, the ring is positioned so that the cutouts of its cartridge side edge are placed above the lugs of the attaching means and the ring is then pushed onto the cartridge so that the remaining cartridge side edge of the locking ring slides into the circular undercut 48 of the attaching means. The locking ring is also provided with a serration 58 for better manual gripping. The mixer side edge 54 has two opposite cutouts 56 and 57 of different width corresponding to the lugs 10 and 11 of the mixer for insertion in one position only. These two cutouts are arranged at 90° to the cutouts 55 of the cartridge side edge.

Thus, when the mixer 59 is to be attached to the locking ring on the cartridge and the locking ring is rotated by 90°, the remaining inside flange parts of both the cartridge side edge and the mixer side edge serve as bayonet retaining means to encompass the mixer lugs 10 and 11 as well as the lugs 44 of the attaching means 47 of the cartridge for strong securement.

FIGS. 5-18 and 5-19 show cartridge 42 of FIG. 5-14 with a mixer 59, which is similar to mixer 1 of FIG. 5-1 with the same mixer inlet section 5 with separate female inlets 6 and 7, except that the housing 60 is not rotatable around the integral internal parts of the mixer and has no ribs 8, and the two bayonet lugs 10 and 11 are of different widths. FIG. 5-18 shows the mixer introduced within the locking ring 51 with the locking ring in its locked position and FIG. 5-19 shows a section along the line XIX-XIX in FIG. 5-18 of the same assembly at 90°. It is evident that a mixer with separated inlet chambers can be attached likewise and also that a cartridge may be one having containers with different cross-sectional areas as in FIG. 5-5.

The above described system of the coded attachment of the mixer also allows for the coded attachment of closure caps, adapters etc., thus preventing cross contamination and allowing closure cap re-use.

The first embodiment of a coded closure cap 61 , FIGS. 5-20 and 5-21 , consists of two parts. The insert 62 has two male plugs 63 for closing the outlets of a cartridge, for example the distanced outlets 14 and 15 of cartridge 12 of FIG. 5-3.

In this embodiment it is shown how the sealing effect of a plug at the cartridge outlet can be improved by providing the male plug 63 with a second rim 63A reaching over the female cartridge outlet. The provision of such a male plug with a circumferential rim is of course not limited to this example.

The rotatable attaching means has two bayonet lugs 64 and 65 of different widths corresponding to the lugs 10 and 11 of mixer 1 of FIG. 5-1. The outer surface of the cap is provided with ribs 6 6 and a collar 70 for better gripping. The coded attachment of the closure cap to cartridge 12 or 24 is analogous to the attachment of mixer 1 .

The second embodiment, FIGS. 5-22 and 5-23, consists of a coded closure cap 67, which also h as two plugs 68 for closing the outlets of a cartridge, for example the distanced male outlets 14 and 15 of cartridge 35 of FIG. 5-9, and a slot 69 similar to slot 30 at mixer 25 for coded cooperation with nose piece 36 of cartridge 35. The outer surface of the cap is also provided with a collar 70 for better manual gripping. The attachment of the cap to cartridge 35 is achieved with coupling ring 31 of FIG. 5-11 , analogous to the attachment of mixer 25 to that cartridge.

The third embodiment of a coded closure cap 71 , FIGS. 5-24 and 5-25, is similar to the second embodiment and comprises two plugs 72 for closing the distanced male outlets 45 and 46 of cartridge 42 of FIG. 5-14. FIG. 5-25 shows the cartridge side of the closure cap with two bayonet lugs 73, 74 of different width and diametrically opposed on the edge facing the cartridge. This closure cap is attached by means of the locking ring 51 of FIGS. 5-18 and 5-19 and is also provided with a collar 70 for better manual gripping.

The ring-shaped bayonet attachment means of the cartridge ensures a better stability of its outlet area and stronger retaining of the bayonet lugs compared with prior art bayonet attachment means.

In the case of utilizing the advantages of the ring-shaped bayonet socket alone and without the need for coded attachment, the bayonet lugs 10 and 11 , 32 and 33, 64 and 65 at the mixer or closure cap or accessory as well as the corresponding bayonet cutouts 19 and 20 at the retaining means at the cartridge or 56 and 57 at the locking ring 51 , may have the same widths. This applies also in the case when more than two lugs and corresponding cutouts are used, for example three or four respectively.

The FIGS. 5-26 to 5-28 show a further embodiment with an inverse bayonet arrangement as compared with those of the bayonet arrangement of the mixer and cartridge according to FIGS. 5-1 to 5-4. FIG. 5-26 shows a mixer 80 comprising a mixer housing 81 with mixer outlet 4 and a mixer inlet section 82 containing two separated inlet parts 83 and 84 followed by a separating element 3S, which in turn is fixedly attached to a properly aligned element 3D of the mixer element group 3. Also, this mixer i s attached to the cartridge by matching the coding means of mixer and cartridge by pressing the mixer onto the cartridge and by rotating the mixer housing 81 of the mixer about the integral internal mixer parts comprising separate female inlets 83 and 84, the separating element 3S and the mixer element group 3. The mixer element group or part thereof could also be prealigned and be fixedly assembled within the mixer housing.

The mixer housing 81 is provided with longitudinal ribs 8, which end at the larger diameter 85. The larger end of the mixer housing has a nose piece 89, which provides a highly visible coded guide for alignment and insertion into the slotted prong 90 of the cartridge. The mixer housing 81 is also provided with a ring-shaped bayonet socket attachment means 100 comprising two bayonet flange parts 94 and 95 acting as bayonet retaining means, having two cutouts 96 and 97 in between.

The cartridge 86 has two cylindrical containers 87 and 88 with the distanced outlets 14 and 15 for fitting and sealing within the mixer inlet section 82. The cartridge front 86A is provided with a slotted prong 90 and a guide piece 91 for preventing incorrect insertion of the mixer and further with two bayonet flanges 92 and 93 with tapered wedge-shaped edges, corresponding in width with the mixer cutouts 96 and 97, and with reduced diameter cutouts 98 and 99 in between.

For attaching the mixer to the cartridge, the mixer inlet part 82 is introduced into the cartridge by aligning the nose piece 89 of the mixer housing within the slotted prong 90 while the part 91 acts as a guide piece as the mixer inlets are pushed onto and over the cartridge distanced male outlets 14 and 15 such that the cartridge flanges 92 and 93 correspond to and enter within the mixer cutouts 96 and 97. Upon rotating the mixer housing, the mixer bayonet flange parts 94 and 95 progressively move against the cartridge flanges 92 and 93, because of their tapered wedge shaped depth, forcing the mixer 80 against the cartridge front 86A. During this mixer to cartridge attachment, the mixer housing 81 rotates 90° about the stationary integral internal mixer parts. The above bayonet arrangement, wherein the ring-shaped bayonet socket is at the accessory, as shown for a rotating mixer housing, can also be used in analogous manner for previously shown embodiments and for the closure caps, with the exception of the locking ring solutions. Alternative coding means arranged around the outer periphery of the mixer housing are possible or is achieved by different widths of cutouts and matching flange parts.

FIGS. 5-29 to 5-31 show a further embodiment wherein the mixer is provided with male inlet parts fitting into and sealing within the female cartridge outlets.

FIG. 5-29 shows a mixer 101 comprising a mixer housing 102 with mixer outlet 4 and a mixer inlet section 103 containing two separate male inlets 104 and 105 followed by a separating element 3S which in turn is fixedly attached to a properly aligned first dividing element 3D of the mixer element group 3. Also, this mixer is attached to the cartridge by matching the coding means of the mixer to the coding means of the cartridge, by pressing the mixer onto the cartridge and by rotating the mixer housing 102 about the integral internal mixer parts comprising separate male inlets 104 and 105, the separating element 3S and the mixer element group 3. The mixer element group or part thereof could also be prealigned and be fixedly assembled within the mixer housing.

The mixer housing 102 is provided with longitudinal ribs 8 which end at the larger diameter 106, the two lateral ends of, which are formed as bayonet lugs 107 and 108, FIG. 5-30, cooperating with the bayonet retaining means of the cartridge. The bayonet lugs do not have the same width, lug 107 being larger.

The cartridge 109, FIG. 5-31 , has two cylindrical containers 110 and 111 with the distanced female outlets 112 and 113 for fitting and sealing over the male mixer inlets 104 and 105. The cartridge front 114 is provided with the same bayonet means 16 as the cartridge of FIG. 5-4, comprising a ring-shaped bayonet socket.

FIGS. 5-32 to 5-34 show a further embodiment wherein the mixer is provided with a male and a female inlet part fitting and sealing into/over the female/male cartridge outlets.

FIG. 5-32 shows a mixer 115 comprising a mixer housing 116 with outlet 4 and a mixer inlet section 117 containing a separate male inlet 118 and a separate female inlet 119 followed by separated chambers 117A and 117B, which in turn are fixedly attached to a properly aligned first dividing element 3D of the mixer element group 3. Also, this mixer is attached to the cartridge by pressing the mixer onto the cartridge and by rotating the mixer housing 116 about the integral internal mixer parts comprising separate male inlets 118 and 119, the separated chambers 117A and 117B and the mixer element group 3. The mixer element group or part thereof could also be prealigned and be fixedly assembled within the mixer housing.

The mixer housing 116 is provided with longitudinal ribs 8, which end at the larger diameter 120, the two lateral ends of which are formed as bayonet lugs 121 and 122, FIG. 5-33, cooperating with the bayonet retaining means of the cartridge. The bayonet lugs do not have the same width, bayonet lug 121 being larger.

The cartridge 123 has two cylindrical containers 124 and 125 with one distanced male outlet 126 and one distanced female outlet 127 for, respectively, fitting and sealing within the separate female inlet 119 and over the separate male inlet

118 of the mixer. The cartridge front 128, FIG. 5-34 , is provided with the same bayonet means 16 as the cartridge of FIG. 5-4, comprising a ring shaped bayonet socket.

The embodiments of FIGS. 5-35 and 5-43 show sector-shaped bayonet sockets instead of complete ring-shaped ones. The function and the attaching of the accessory are the same as in the previous embodiments, so that the three different embodiments of the bayonet means are illustrated in one respective example of mixer and cartridge. It is obvious that the sector-shaped bayonet socket and similar means can be provided on all other embodiments also.

FIG. 5-35 shows a mixer-cartridge assembly with a mixer 130 comprising a mixer housing 131 with outlet 4 and a mixer inlet section 132 containing two separate male inlets 133 and 134 followed by separating chambers 133A and 134A which in turn are fixedly attached to a properly aligned first dividing element 3D of the mixer element group 3. Also, this mixer is attached to the cartridge by pressing the mixer onto the cartridge and by rotating the mixer housing 131 about the integral internal mixer parts comprising separate male inlets 133 and 134, the separated chambers 133A and 134A and the mixer element group 3. The mixer element group or part thereof could also be prealigned and be fixedly assembled within the mixer housing.

The mixer housing 131 is provided with longitudinal ribs 8 which end at the larger diameter 135, the two lateral ends of, which are formed as bayonet lugs 136 and 137, FIG. 5-37, cooperating with the sector-shaped bayonet sockets 145, 146, serving as bayonet retaining means of the cartridge. The bayonet lugs have the same width and are provided each with a rib 136A and 137A at its end which both strengthen each lug and acts as a stop as well as ensuring that the mixer can be turned and attached in o n e direction only. The upper surface of the lugs may have inclined surface parts so as to enforce the locking ability by an axial load. Corresponding inclined surface parts may also be located on the corresponding surface of the cartridge sector shaped bayonet sockets.

The cartridge 138 has two cylindrical containers 139 and 140 with two distanced female outlets 141 and 142 for receiving and sealing over the separate male inlets 133 and 134. The cartridge front 143, FIG. 5-36, is provided with bayonet means comprising sectorshaped bayonet sockets 145, 146 which act as prongs and are closed on one side by a rib 145A and 146A which connects to the cartridge end wall so as to stiffen and increase the strength of the bayonet prong. The cutouts 149 and 150 between the sector shaped bayonet sockets allow for the introduction of the mixer bayonet lugs 136 and 137.

In this embodiment the bayonet lugs and the sector shaped bayonet sockets have approximately the same width. The coding is achieved by other coding means on the mixer and on the cartridge. The cartridge front 143 is provided with a T-shaped protrusion 151 arranged between the two outlets and the mixer inlet face is provided with a similar protrusion 152 arranged off centre between the mixer inlets, see FIGS. 5-36 and 5-37.

The two T-shaped coding means allow the attachment of the mixer in one orientation only since, when putting the mixer onto the cartridge such that when the two profusions are laying one upon the other, they will prevent the introduction of the mixer inlets into the cartridge outlets and also any contact between the cartridge outlets and the mixer inlets or plugs of closure means thus preventing cross contamination and prohibiting mixer/accessory attachment. It is obvious that the coding protrusions can have any shape other than a T-form, and could be, e.g., in the form of a keyway allowing only one defined position in which to introduce the mixer having a corresponding protrusion, or two differently shaped keyways and corresponding protrusions.

The coded alignment can be facilitated by visual coding means, e.g., a marking 1 53 at the cartridge outlet end and a marking 154 at the bayonet lug 137 of the mixer on the same side as the coding protrusion. In the embodiment of FIGS. 5-38 to 5-40, the coding is achieved by cutouts of different widths between the lugs. FIG. 5-38 shows a mixer-cartridge assembly with a mixer 155 with a mixer housing 156, outlet 4 and integral internal mixer parts comprising two separate inlets 157 and 158 ending into a disc-shaped flange and followed by separated chambers 157A and 158A which in turn are fixedly attached to a properly aligned first dividing element 3D of the mixer element group 3. Also, this mixer is attached to the cartridge by pressing the mixer onto the cartridge and by rotating the mixer housing 156 about the integral internal mixer parts. The mixer element group 3 or part thereof, may also be prealigned and fixedly assembled within the mixer housing.

The mixer housing 156 is provided with longitudinal ribs 8, which end at the larger diameter 159, the two lateral ends of which are formed as bayonet lugs 160 and 161 , FIG. 5-40, cooperating with the sector shaped bayonet retaining means of the cartridge. In this FIG. 5-38 and also in FIGS. 5-13, 5-32, 5-35 and 5-45 it is shown that the inlet end of the mixer housing has not only one cylindrical enlargement but two, e.g., one 159 at the inlet, lodging and sealing against the separate inlets 157, 158, followed by the second part 159A having an intermediate diameter and lodging and sealing against the separating means 157A, 158A. The bayonet lugs have the same widths but the gaps or cutouts 194, 195 between them are different, corresponding to the different widths of the sector shaped bayonet sockets on the cartridge.

These bayonet lugs 160, 161 , can be provided each with a rib 167, FIG. 5-40, on the reverse side of the mixer inlet which both strengthen the lug and act as stop as well as limiting rotation in one direction only so as to prevent the mixer from being attached at 180° to the correct alignment. The upper surface of the lugs may have inclined parts, not shown, so as to enforce the locking and sealing ability by an axial force. Corresponding inclined parts, not shown, may also be located on the corresponding surface of the cartridge sector shaped bayonet sockets.

The cartridge 162 has two cylindrical containers 163 and 164 with two distanced female outlets 165 and 166 for receiving and sealing over the separate male inlets 157 and 158. The cartridge front 168, FIG. 5-39, is provided with bayonet means, comprising two sector-shaped bayonet sockets.

In FIG. 5-39, the bayonet means at the cartridge comprises two diametrically opposed sector-shaped bayonet sockets 169 and 170 acting as bayonet prongs for the bayonet lugs of the mixer, the two sockets having different widths, socket 169 having the greater width. The two cutouts 171 and 172 between the sockets allow for the introduction of the corresponding mixer bayonet lugs 160 and 161 into the sector shaped bayonet sockets 169, 170. As shown in this Figure, the passages of the bayonet sockets 169 and 170 commence as straight passages but become curved from the mid point onwards so as to achieve a greater strength against bayonet lug axial forces.

The passages can be wholly curved, without straight parts, and wholly or partly curved passages can also be provided on the ring-shaped bayonet attachment means.

In order to prevent any inadvertent contact whatsoever of the mixer or accessory inlet or inlets with the cartridge outlet or outlets by any form of tilting or tipping of one against the other during incorrect alignment the larger cutout 195 at the mixer is provided with a V- shape nose 192 corresponding to a V-shape incision 193 at the larger socket 169 such that the mixer is kept outside of the narrower bayonet socket 170 by the V-shape nose 192.

In this embodiment also the coded alignment can be facilitated by visual coding means, e.g., marking 153 at the cartridge and marking 154 at the corresponding lug.

In case no univocal attachment of a mixer to the cartridge 162 is necessary the cutouts between the lugs of the mixer must be large enough to fit over the larger retaining means of the cartridge, whereas the visual coding means rest the same as previously described.

FIGS. 5-41 to 5-44 show a similar arrangement to that of the FIGS. 5-38 to 5-40 except that the mixer 200 is separate from coupling ring 196, the latter being rotated about the stationary mixer during the final rotary locking attachment of the coupling ring bayonet lugs 160A, 161 A, into the sector shaped bayonet sockets 169, 170 of the cartridge 162.

FIG. 5-41 shows mixer 200 with the outlet 4 and comprising a housing 201 containing the mixer element group 3 in alignment with inlet part 197, the latter only partially contained within the mixer housing and comprising separate male inlets 157B, 158B and separate chambers 157C, 158C. A ridge 198 lodges and seals the inlet part 197 within the mixer housing. The coupling ring 196 is preassembled and prealigned with the mixer inlet part 197 via a groove 199, FIG. 5-41 , in the coupling ring 196. FIG. 5-43 shows coupling ring 196 with the same coded bayonet lugs 160A, 161 A, cutouts 194A, 195A, visual coding

154 and V-shape nose coding 192A as used in the embodiment according to FIG. 5-40.

FIG. 5-44 shows the mixer 200 and the cartridge 162 when assembled together. Prior to such assembly, the coupling ring 196 may be pre-assembled to the mixer under sufficient tension such that both components are held together in the correct relative alignment for initial visual coded and initial axial mechanical coded contact and attachment of the mixer inlets 157B, 158B to the cartridge outlets 165, 166 on the cartridge prior to the final rotary locking attachment of the coupling ring as described above. In this embodiment therefore, there is no rotation of the mixer housing 201 about the mixer inlet part 197 and element group 3 during attachment.

In the embodiment according to FIGS. 5-45 to 5-47 the sector-shaped bayonet sockets are at the mixer and the bayonet lugs at the cartridge, in analogy to the embodiment according to FIGS. 5-26 to 5-28.

FIG. 5-44 shows a mixer-cartridge assembly with a mixer 173 comprising a mixer housing 174 with outlet 4 and a mixer inlet section 175 containing the integral internal parts comprising two separate male inlets 176 and 177 followed by separated chambers 176 A and 177A which in turn are fixedly attached to a properly aligned first dividing element 3D of the mixer element group 3. Also, this mixer is attached to the cartridge by pressing the mixer onto the cartridge and by rotating the mixer housing 174 about the separate male inlets 176 and 177, the separated chambers 176A and 177A and the mixer element group 3. The mixer element group or part thereof could also be prealigned and be fixedly assembled within the mixer housing.

The mixer housing 174 is provided with longitudinal ribs 8, which end at the larger diameter 178, the two lateral ends of which are formed as two diametrically opposed sector-shaped bayonet sockets 179 and 180 (see FIG. 5-43) acting as prongs which are both closed at one side by a rib 179A and 180A connecting to the mixer wall so as to stiffen and increase the strength of the bayonet prong. The cutouts 181 and 182, between the sockets, allow for the introduction of the cartridge bayonet lugs cooperating with the bayonet retaining means of the mixer.

The cartridge 183 has two cylindrical containers 184 and 185 with two distanced female outlets 186 and 187 for fitting and sealing over the separate male inlets 176 and 177. The cartridge front 188, FIG. 5-42, is provided with bayonet means, comprising sectorshaped bayonet lugs 190 and 191 having the same width and each being provided with a rib 190A and 191 A at its end which strengthens the lug and act as a stop as well as limiting rotation in one direction only so as to prevent the mixer from being attached at 180° to the correct alignment. The upper surface of the lugs may have inclined surface parts, not shown, so as to enforce the locking ability by an axial load. Corresponding inclined surface parts, not shown, may also be located on the corresponding surface of the mixer sector shaped bayonet sockets.

The lugs and the cutouts have approximately the same width. Thus, the required coding is achieved by other coding means on the mixer and on the cartridge. Therefore, the cartridge front 188 is provided with the T-shaped protrusion 151 arranged between the two distanced female outlets and the mixer inlet face is provided with a similar shaped protrusion 152 arranged off center between the mixer inlets. See FIGS. 5-46 and 5-47.

The two T-shaped coding means allow the introduction of the mixer in one position only, since the placing of the mixer onto the cartridge is such that, when the two profusions are laying one upon the other, they will prevent the introduction of the mixer separate male inlets into the cartridge distanced female outlets as well as any contact between the cartridge outlets and the mixer inlets, thus prohibiting cross contamination and mixer/accessory attachment. It is obvious that the coding protrusions can have any shape other than a T-form.

There are situations where the T-shaped coding protrusion give not a 100% protection to warrant no cross-contamination. In the FIGS. 5-48 to 5-58 show several coding protrusions which are believed to warrant that no cross-contamination can occur even if the mixer is introduced onto the cartridge in the wrong sense. To this end the coding protrusions are arranged thus that no tilting around the axis connecting the centers of the two outlets of the cartridge, which could cause this contamination.

The cartridge 210 of FIG. 5-48 is similar to the cartridge 162 of FIG. 5-39 and has the same two cylindrical containers with two distanced female outlets 165 and 166 for receiving and sealing over the separate male inlets 157 and 158. The cartridge front 211 is provided with the bayonet means comprising two diametrically opposed sector-shaped bayonet sockets 169 and 170 acting as bayonet prongs for the bayonet lugs of the mixer, the two sockets having different widths, socket 169 having the greater width. The two cutouts 171 and 172 between the sockets allow for the introduction of the corresponding mixer bayonet lugs 160 and 161 into the sector shaped bayonet sockets 169, 170. As shown in this Figure, the passages of the bayonet sockets 169 and 170 commence as straight passages but become curved from the mid-point onwards so as to achieve a greater strength against bayonet lug axial forces.

In addition to the cartridge of FIG. 5-39, the front of this cartridge 210 is provided with a coding protrusions 212, consisting of two pins 213 arranged symmetrically to the axis connecting the centers of the outlets but asymmetrically as regards the transversal middle axis, e.g., on the side of one outlet.

FIG. 5-49 shows a mixer 214 similar to the mixer 155 of FIG. 5-38 with a mixer housing 156, outlet 4 and integral internal mixer parts comprising two separate inlets 157 and 158 followed by separated chambers 157A and 158A, which in turn are fixedly attached to a properly aligned first dividing element 3D of the mixer element group 3. Also, this mixer is attached to the cartridge by pressing the mixer onto the cartridge and by rotating the mixer housing 156 about the integral internal mixer parts. The mixer element group 3 or part thereof, may also be prealigned and fixedly assembled within the mixer housing.

The mixer housing 156 is provided with longitudinal ribs 8, which end at the larger diameter 159, the two lateral ends of which are formed as bayonet lugs 160 and 161 cooperating with the sector shaped bayonet retaining means of the cartridge. This mixer 214 can also have two enlargements, e.g., one 159 at the inlet, lodging and sealing against the separate inlets 157, 158, followed by the second part 159A having an intermediate diameter and lodging and sealing against the separating means 157A, 158A. The bayonet lugs have the same widths but the gaps or cutouts 194, 195 between them are different, corresponding to the different widths of the sector shaped bayonet sockets on the cartridge, and have also ribs.

In addition to the mixer of FIG. 5-38 the inlet part of this mixer 214 is provided with the same coding protrusions 215 as those of the cartridge, consisting of two pins 216 and arranged in accordance to the pins 213 of the cartridge such that the mixer can only be introduced the correct way with regard to the other coding means without the possibility of tilting if introduced by force the wrong way. The FIGS. 5-51 to 5-58 show further arrangement and forms of coding protrusions 212, 215, whereby the cartridge as well as the mixer are always the same as in FIGS. 5-48 to 5-50 and only the coding protrusions are provided with numerals, the other parts being the same.

FIGS. 5-51 and 5-52 show a coding protrusion 212 on the cartridge front consisting of two bars 217 arranged symmetrically to the transversal middle axis of the cartridge but asymmetrically to the axis connecting the centers of the outlets. The two bars 218 of the mixer inlet part are arranged in accordance to those of the cartridge such that introduction and attachment of the mixer onto the cartridge is only possible in one position.

FIGS. 5-53 and 5-54 show a coding protrusion 212 on the cartridge front consisting of two D-shaped protrusion 219 arranged symmetrically to the transversal middle axis of the cartridge but asymmetrically to the axis connecting the centers of the outlets, with both flat sides looking in one direction. The two D-shaped protrusions 220 of the mixer inlet part are arranged in accordance to those of the cartridge such that introduction and attachment of the mixer onto the cartridge is only possible in one position.

FIGS. 5-55 and 5-56 show a coding protrusions 212 on the cartridge front consisting of a male plug 221 and a female plug 222 arranged symmetrically. The male plug 223 and the female plug 224 of the mixer inlet part are arranged in accordance to those of the cartridge such that introduction and attachment of the mixer onto the cartridge is only possible in one position.

FIGS. 5-57 and 5-58 show a particularly effective coding protrusions 212 on the cartridge front consisting of a bar 225 on one side of the axis connecting the centres of the outlets and two spaced bars 226 on the other side of this axis, arranged symmetrically to the transversal middle axis of the cartridge. The single bar 227 and the double bar 228 of the mixer inlet part are arranged in accordance to those of the cartridge such that introduction and attachment of the mixer onto the cartridge is only possible in one position.

All these coding protrusions prevent efficiently tilting of the mixer during attachment to the cartridge and hence cross-contamination. The coded alignment can be facilitated by visual coding means, e.g., the marking 153 at the cartridge, opposite the protrusion and the marking 154 at the lug of the mixer near the coding protrusion.

It follows from the embodiment according to FIGS. 5-32 to 5-34 that the mixer inlets and the cartridge outlets may be either female or male respectively and it follows also that it is possible to provide the mixer with o n e female and one male inlet fitting over/into the corresponding male/female outlet of the cartridge.

This latter arrangement provides for a further coding means since only one position is possible for matching the mixer or closure means to the cartridge. This mixed arrangement of coding and coding means is independent from the manner of attachment with a coupling ring, locking ring or rotatable mixer housing.

While the different widths of the bayonet lugs provide for a distinct coding means, it might be advantageous to enhance this effect by visualisation of the coding by optical means such as different colors, a notch and a marking or by providing one lug of the accessory with a cutout and the corresponding nose at the cartridge bayonet means. This can be done either for visual marking one of the coding parts or for the coding itself.

Cartridges separated with one single wall, e.g., according to US. Pat. No. 5,333,760, cannot exclude chemical migration through such a single wall separation barrier and therefore separation at the cartridge outlets is not sufficient to prevent migration and therefore a reaction within the cylinders during storage.

It follows in particular from the FIGS. 5-5, 5-14, 5-26, 5-29, 5-32, 5-35, 5-38 and 5-41 that it is advantageous to provide for a single piece cartridge consisting of two complete, preferably cylindrical containers, which are substantially separated by an air gap L in between, see e.g. FIG. 5-32. This assures a total chemical separation along the whole length where the chemicals are contained, ahead of the cylinder pistons, all the way to the top of the outlets where, during storage, a closure means is installed. During dispensing, this separation is further maintained within the mixer up to the first dividing element 3D of the mixer element group.

The present aspect, is not limited to air gap separated containers and applies as well to cartridges with containers separated by one single wall according to FIG. 5-3. It follows from the above description that the inventive cartridge to accessory attachment combination provides in particular for cartridge containers separated by an air gap up to and including the individual outlets and for a port to port coded alignment for same or dissimilar size ports, with no cross-contamination caused by rotation or random attachment, while maintaining separation past the interface and well into the mixer, so as to hinder the spreading of any possible reaction and plugging of the components at the interface and back into the cartridge outlets. This combination also provides optimization of the mixing performance especially, but not uniquely, for ratios other than 1 :1.

While the foregoing description and the drawing of the cartridge embodiments pertained to multi-component cartridges with side-by-side containers the teaching of the present aspect is not limited thereto and can be applied as well to cartridges with concentric containers or otherwise arranged and formed containers.

However, the principle of coded attachment ensures both the correctly aligned connection of a mixer or accessory to cartridge outlets since only one position of the mixer or accessory is possible and, in the case of the re-connection of mixer or closure cap to a cartridge, eliminates the possibility of cross-contamination.

Furthermore, and in respect to mixers, all the above described embodiments have the advantage of comprising the minimum number of parts and of being compact, resulting in low molding and assembly costs since the whole inlet section comprising the separating means and the mixer element group is made in one piece. Also, the integral construction of this internal part ensures proper alignment, thus, providing optimum mixing efficiency.

In the case of the first embodiment according to FIG. 5-1 when a relatively long mixer element group is used and where rotational friction between this mixer element group and the mixer housing might cause problems, it may be preferable to separate a part or the whole of the mixer element group from the separating means of the inlet section such that a part or the whole of the mixer element group may be fixedly assembled within the housing and therefore it rotates with the housing while connecting the mixer to the cartridge. In this case - and as seen from the mixer inlet to the mixer outlet - the leading edge of the first element of the mixer element group, or of a portion thereof, must be fixedly assembled within the housing in a pre-aligned position.

Therefore, after rotating the housing so as to attach the mixer to the cartridge, correct alignment of the elements is achieved such that each of the two material streams leaving the separating means, or the first element group attached to the separating means, will be evenly divided by the leading edge of the first element of the element group, or portion thereof attached to the housing, for optimum mixing efficiency.

It is evident that instead of cylindrical inlets and outlets, D-shaped or differently shaped similar or dissimilar sized inlets and outlets are possible. Furthermore, the same principle can also be used for a dispensing device, or cartridge, for more than two components.

In addition to the accompanying set of claims, several side aspects of the present invention are described in the following.

Supplementary first aspect:

A supplementary first aspect refers to a mixer arranged in a tube with a tube axis defining the general direction of a flow of materials for mixing, the mixer including at least one mixing element which comprises: a plurality of deflecting plates disposed nonparallel to the tube axis; at least one first separating flange extending across the tube and having a first connecting boundary which is connected to at least some of the plurality of deflecting plates and a first open boundary which is spaced from the plurality of deflecting plates generally in the direction of the tube axis, a cross-sectional plane perpendicular to the tube axis across the first open boundary and the plurality of deflecting plates defining a first axial section in the tube, the at least one first separating flange dividing the first axial section into a plurality of subareas which include first blocked areas having at least one of the plurality of deflecting plates as a boundary and first open subareas not bounded by the deflecting plates, each first separating flange having one first open subarea to each side thereof; and at least one second separating flange extending across the tube and having a second connecting boundary which is connected to at least some of the plurality of deflecting plates and a second open boundary which is spaced from the plurality of deflecting plates generally in the direction of the tube axis opposite from the at least one first separating flange, a cross-sectional plane perpendicular to the tube axis across the second open boundary and the plurality of deflecting plates defining a second axial section in the tube, the at least one second separating flange dividing the second axial section into a plurality of subareas which include second blocked areas having at least one of the plurality of deflecting plates as a boundary and second open subareas not bounded by the deflecting plates, each second separating flange having one second open subarea to each side thereof, the at least one second separating flange being nonparallel to the at least one first separating flange.

The above described mixer which includes a plurality of the mixing elements oriented along the tube axis forming a series of neighboring mixing elements, wherein each pair of neighboring mixing elements have the at least one first separating flange of one neighboring mixing element adjacent and nonparallel to the at least one second separating flange of another neighboring mixing element.

The mixer of the supplementary first aspect which includes a plurality of the mixing elements oriented along the tube axis forming a series of neighboring mixing elements, wherein each pair of neighboring mixing elements have the first open subareas of one neighboring mixing element adjacent to and offset from the second open subareas of another neighboring mixing element.

The mixer of the supplementary first aspect, wherein the first separating flanges divide the first axial section into subsections of approximately equal sizes.

The mixer of the supplementary first aspect, wherein the at least one second separating flange crosses the at least one first separating flange at an angle of about 90°.

The mixer of the supplementary first aspect, wherein the first axial section and the second axial section are approximately equal in size.

The mixer of the supplementary first aspect which includes a plurality of the mixing elements oriented along the tube axis, wherein at least one of the mixing elements has a length along the tube axis defined between the first open boundary of the at least one first separating flange and the second open boundary of the at least one second separating flange, the tube has a maximum tube diameter, and the length is smaller than the maximum tube diameter.

The mixer of the supplementary first aspect, wherein the length is smaller than half of the maximum tube diameter.

The mixer of the supplementary first aspect, wherein the plurality of deflecting plates lie in a common plane.

The mixer of the supplementary first aspect, wherein the plurality of deflecting plates form a single plate.

The mixer of the supplementary first aspect, wherein at least one of the plurality of deflecting plates is inclined by an angle (alpha) relative to a cross-sectional plane of the tube which is perpendicular to the tube axis.

The mixer of the supplementary first aspect, wherein the angle (alpha) is less than 30°.

The mixer of the supplementary first aspect which includes a plurality of the mixing elements oriented along the tube axis, wherein the mixing elements form a monolithic structure.

The mixer of the supplementary first aspect, wherein the monolithic structure is made by injection molding.

The mixer of the supplementary first aspect which includes a plurality of the mixing elements oriented along the tube axis forming a series of neighboring mixing elements, wherein the first open boundary of each mixing element is adjacent to and spaced from the second open boundary of a neighboring mixing element.

The mixer of the supplementary first aspect, further comprising a plurality of connection elements which connect each mixing element with the neighboring mixing element.

The mixer of the supplementary first aspect, wherein the tube is square or circular in cross-section. The mixer of the supplementary first aspect, wherein the at least one first separating flange and/or the at least o n e second separating flange have strengthened or flow deflectors.

The mixer of the supplementary first aspect which includes a plurality of the mixing elements oriented along the tube axis forming a series of neighboring mixing elements, wherein the at least one first separating flange of each mixing element has a slot with which the at least o n e second separating flange of a neighboring mixing element cooperates to connect the neighboring mixing elements together.

The mixer of the supplementary first aspect, wherein at least one of the at least one first separating flange, the at least one second separating flange, and the plurality of deflection plates is nonplanar.

The mixer of the supplementary first aspect, wherein at least one of the at least one first separating flange, the at least one second separating flange, and the plurality of deflection plates has a recess.

The mixer of the supplementary first aspect which includes a plurality of the mixing elements oriented along the tube axis, wherein the tube is conical tapering in the direction of the tube axis and the mixing elements are differently sized in accordance with the tapering to fit inside the conical tube.

The mixer of the supplementary first aspect which includes a plurality of the mixing elements oriented along the tube axis, wherein at least one mixing element has different numbers of the first separating flange and second separating flange from another mixing element.

Utilization of the mixer of the supplementary first aspect for mixing materials including plastics, resins, glues or other viscous materials, wherein the Reynolds number for the materials flowing through the mixer is less than 1 .

Supplementary second aspect: A supplementary second aspect refers to a static mixer comprising: a bundle of chambered strings arranged in a tube and oriented in a direction of the tube, the chambered strings comprising a plurality of chambers each extending in the direction of the tube between two closed ends, the plurality of chambers including a plurality of mixing-active chambers and a plurality of re-layering chambers, each mixing-active chamber including first and second mutually adjacent side walls having four alternately disposed passages each providing communication with one of first and second neighboring mixing-active chambers downstream thereof and first and second neighboring mixing-active chambers upstream thereof, the plurality of mixing-active chambers being arranged into at least two sections spaced along the direction of the tube by the re-layering chambers, the re-layering chambers each having first, second and third lateral passages providing communication with neighboring chambers.

The mixer of the supplementary second aspect, wherein the re-layering chambers are arranged in pairs which are connected by one of the first, second and third lateral passages of each re-layering chamber.

The mixer of the supplementary second aspect, wherein each pair of the re-layering chambers are directly connected.

The mixer of the supplementary second aspect, wherein the plurality of chambers further include intermediate chambers having first and second lateral passages and each pair of the re-layering chambers are indirectly connected by one of the intermediate chambers.

The mixer of the supplementary second aspect, wherein the bundle has four chambered strings.

The mixer of the supplementary second aspect, wherein the mixing-active chambers are substantially formed alike.

The mixer of the supplementary second aspect, wherein the mixing-active chambers connected by the passages between adjacent chambered strings are so arranged as to be displaced by half a chamber length in the direction of the tube with respect to one another. The mixer of the supplementary second aspect, wherein the bundle has nine chambered strings, only eight of the nine chambered strings comprise mixing-active chambers, and one remaining chambered string comprises intermediate chambers which provide indirect connections between the mixing-active chambers.

The mixer of the supplementary second aspect, wherein some of the plurality of chambers of the chambered strings include at least one passage partially bounded by a rib for deflecting a flow through the passage.

The mixer of the supplementary second aspect, wherein the plurality of chambers of the chambered strings have substantially a form of rectangular prisms.

The mixer of the supplementary second aspect, wherein the plurality of chambers of the chambered strings have passages which are substantially rectangular.

The mixer of the supplementary second aspect, wherein the chambered strings include walls separating adjacent chambers with the passages of the adjacent chambers formed through the walls, each wall having a relatively small thickness so that a square of the wall thickness is substantially smaller than an area of one of the passages through the wall.

The mixer of the supplementary second aspect, wherein the bundle of chambered strings is formed by injection molding.

The mixer of the supplementary second aspect, wherein the bundle of chambered strings is reinforced by strips which are arranged at a periphery of the bundle in the direction of the tube.

The mixer of the supplementary second aspect, wherein the bundle of chambered strings is in the form of a monolithic structure.

Supplementary third aspect:

A first embodiment of a supplementary third aspect refers to a static mixer comprising mixing elements for separating the material to be mixed into a plurality of streams, as well as means for the layered junction of the same, including a transversal edge and guide walls that extend at an angle to said transversal edge, as well as guide elements arranged at an angle to the longitudinal axis and provided with openings, wherein said mixing element comprises a transversal edge and a following transversal guide wall and at least two guide walls ending in a separating edge each with lateral end sections and with at least one bottom section disposed between said guide walls, thereby defining at least one opening on one side of said transversal edge and at least two openings on the other side of said transversal edge.

A second embodiment of the supplementary third aspect refers to a static mixer comprising mixing elements for separating the material to be mixed into a plurality of streams, as well as means for the layered junction of the same, including separating edges and a transversal edge that extends at an angle to said separating edges, as well as deflecting elements arranged at an angle to the longitudinal axis and provided with openings, wherein said mixing element comprises at least two separating edges with following guide walls with lateral end sections and with at least one bottom section disposed between said guide walls, and a transversal edge arranged at one end of a transversal guide wall, thereby defining at least one opening on one side of said transversal edge and at least two openings on the other side of said transversal edge.

The mixer of one of the two embodiments of the supplementary third aspect, wherein said sections of said guide walls are plane and arranged at a mutual angle.

The mixer of one of the two embodiments of the supplementary third aspect, wherein the enclosure of said mixer has a round cross-section.

The mixer of one of the two embodiments of the supplementary third aspect, wherein the enclosure of said mixer has a rectangular cross-section, said at least two separating edges with the following guide walls are arranged perpendicularly to said at least one transversal edge with said transversal guide wall, and said lateral end sections and said bottom section are arranged perpendicularly to said guide walls.

The mixer of one of the two embodiments of the supplementary third aspect, wherein said guide walls are curved, said at least two guide walls having said separating edges at one end of said mixing element, ending in a transversal edge arranged at the other end of said mixing element. The mixer of one of the two embodiments of the supplementary third aspect, wherein the enclosure of said mixer is round and said mixing element comprises at least two separating edges and one transversal edge connected by guide walls including two lateral end sections and at least one bottom section, said connecting guide walls forming a curved and continuous transition between said separating edges and said transversal edge.

The mixer of one of the two embodiments of the supplementary third aspect, wherein the successive mixing elements are each arranged in a position rotated about the longitudinal axis.

The mixer of one of the two embodiments of the supplementary third aspect, wherein said successive mixing elements are each rotated by 180° about the longitudinal axis.

A third embodiment of the supplementary third aspect refers to a static mixer comprising mixing elements for separating the material to be mixed into a plurality of streams, as well as means for uniting the same in a layered manner, including separating edges and a transversal edge that extends at an angle to said separating edges, as well as deflecting elements arranged at an angle to the longitudinal axis and provided with openings, wherein said mixer comprises mixing groups including mixing elements for said division into a plurality of streams, and wherein at least one re-layering element is disposed between said mixing groups.

The mixer of the third embodiment of the supplementary third aspect, wherein said mixer successively comprises a first mixing group including mixing elements, followed by a relayering element which in turn is followed by a second mixing group, and so on, the entrance edge of said re-layering element extending essentially perpendicularly to the transversal edge of the last mixing element of said mixing group, and said second mixing group being reversed by 1800 with respect to the flow direction such that the lateral edge of said mixing element extends essentially perpendicularly to the outlet edge of said mixing helix.

The mixer of the first embodiment of the supplementary third aspect, wherein the height of said guide walls is greater than the height of said transversal guide wall. The mixer of the second embodiment of the supplementary third aspect, wherein the height of said transverse guide wall is greater than the height of said guide walls.

The mixer of the first embodiment of the supplementary third aspect, wherein the height of the guide walls amounts to 1.1 to 2.0, preferably 1.5 times the height of the transversal guide wall.

The mixer of the second embodiment of the supplementary third aspect, wherein the height of the transversal guide wall amounts to 1 .1 to 2.0, preferably 1 .5 times the height of the guide walls.

The mixer of one of the first and the second embodiment of the supplementary third aspect, wherein said guide walls are internally and/or externally provided with inclined webs.

The mixer of one of the first and the second embodiment of the supplementary third aspect, wherein longitudinal webs are arranged between the guide walls of two adjacent mixing elements.

The mixer of one of the first and the second embodiment of the supplementary third aspect, wherein said bottom sections and said guide walls are provided with dead zone obturations.

An application of the mixer of the first embodiment of the supplementary third aspect in the case where the material first reaches said transversal edge, wherein said mixing element is designed to divide the material stream into at least two streams and to divide said two streams into at least six streams at the exit while two mixed streams are directed to one side of said transversal wall and one mixed stream to the other side of said transversal wall.

An application of the mixer of the second embodiment of the supplementary third aspect in the case where the material first reaches said separating edges and said guide walls, wherein said mixing element is designed to divide the material stream into at least six streams and to direct a respective part of said streams to one side of said transversal edge and the other part of said streams to the other side of said transversal edge.

Supplementary fourth aspect: A first embodiment of a supplementary fourth aspect refers to a static mixer for mixing together at least two components comprising a mixer housing, a mixing element arranged at least partly within the mixer housing and a mixer inlet section having at least two inlets provided at an input side and at least two outlets provided at an output Surface. The at least two outlets are in fluid communication with the at least two inlets. The mixer housing, the mixing element and the mixer inlet section are formed as separate elements. The mixing element comprises a plug element and the mixer inlet section comprises a counter plug element engaging the plug element. The mixing element and the mixer inlet section are plugged together in a rotationally fixed manner by means of a plugged connection.

The static mixer according to the supplementary fourth aspect, wherein the mixing element and the mixer inlet section are held together in an axial direction by means of the plugged connection that is formed by the plug element and the counter plug element and/or by at least one element of the mixer inlet section cooperating with at least one element of the mixer housing.

The static mixer according to the supplementary fourth aspect, wherein the plugged connection, preferably between the plug element and the counter plug element, comprises a clamping connection and/or a frictional connection, such as at least one nose frictionally engaging one of the mixer inlet section and the mixing element, and/or a latching connection of the plug element and the counter plug element.

The static mixer according to the supplementary fourth aspect, wherein the mixing element and the mixer inlet section are aligned in a fixed predefined rotational angular relationship by means of the plug element and the counter plug element.

The static mixer according to the supplementary fourth aspect, wherein the plug element and the counter plug element comprise coding means, in particular a thickened end or a bulge cooperating with a corresponding recess or groove, allowing the mixing element and the mixer inlet section to be plugged together only in the predefined rotational angular relationship. The static mixer according to the supplementary fourth aspect, wherein the plug element comprises a wall section provided at an input end of the mixing element and the counter plug element comprises a groove provided at the surface.

The static mixer according to the supplementary fourth aspect, wherein the wall section is arranged between the at least two outlets so as to separate the components leaving the at least two outlets before entering inlets of the mixing element.

The static mixer according to the supplementary fourth aspect, wherein the wall section has a straight planar shape, and/or comprises a thickened end, and/or has at least partially a U-shaped cross section, and/or has at least partially a T-shaped cross section.

The static mixer according to the supplementary fourth aspect, wherein the at least two inlets have respective inlet openings and the at least two outlets have outlet openings, with the outlet openings being formed in the output surface of the mixing inlet section. A surface area of at least one of the inlet openings is smaller than a surface area of the corresponding outlet opening.

The static mixer according to the supplementary fourth aspect, wherein the output surface of the mixer inlet section has an at least substantially slanted contour at an outlet side of the mixer inlet section with respect to a longitudinal axis of the static mixer, with the outlet side being disposed remote from the inlet side, with the at least substantially slanted contour of the output surface preferably being adapted to a shape of an inlet surface of the mixer housing.

The static mixer according to the supplementary fourth aspect, wherein the static mixer has a longitudinal axis and in that at least two flow paths extend between the at least two inlet and outlet openings. Each inlet and outlet opening has a geometric center, with the geometric center of at least one, preferably of each, of the at least two outlet openings being spaced less far apart from the longitudinal axis than the geometric center of at least one, preferably of each, of the at least two inlet openings.

The static mixer according to the supplementary fourth aspect, wherein in a region of the at least two outlets, the at least two flow paths are configured to cooperate with the mixer housing, preferably with an inlet surface of the mixer housing, to provide a component flow guide region at inlets of the mixing element. The at least two outlets of the mixer inlet section are preferably arranged to at least partly overlap with inlets of the mixing element, in particular with the inlets of the mixing element being formed by the mixing element and/or by spaces formed between the mixing element and an internal wall of the mixer housing.

The static mixer in accordance the supplementary fourth aspect, wherein at least one region of at least one of the at least two outlets adjacent to the corresponding outlet opening is configured such that its cross-section perpendicular to the respective one of the at least two flow paths is enlarged in comparison to the corresponding inlet, in particular such that the flow path extending between the inlet opening and the outlet opening is directed and enlarged in a direction towards at least one inlet of the mixer element.

The static mixer in accordance with the supplementary fourth aspect, wherein at least one recess is provided at an outlet side of the mixer inlet section, wherein one of the at least two outlets opens into a base of the at least one recess and a cross-sectional area of the at least one recess is preferably larger than a cross-sectional area of the one of the at least two outlets. The depth of the recess in the axial direction preferably amounts to at least a third, in particular to at least half of the diameter of the outlet, or is preferably equal to or larger than the diameter of the outlet, with the at least one recess in particular having a cross-sectional shape that deviates from a circle especially such that the at least one recess has an elongate shape that is in particular extended towards the longitudinal axis. Alternatively or in addition to this, the at least one recess is connected to the other one of the at least two outlets and/or to a further recess in a direction transverse to the longitudinal axis.

The static mixer in accordance with the supplementary fourth aspect, wherein the mixing element comprises a plurality of mixer elements arranged one after another for a repeated separation and recombination of streams of the components to be mixed, in particular in that either the mixing element comprises mixer elements for separating the material to be mixed into a plurality of streams, as well as means for the layered merging of the same, including a transverse edge and guide walls that extend at an angle to said transverse edge, as well as guide elements arranged at an angle to the longitudinal axis and provided with openings. Said mixing element comprises a transverse edge and a following transverse guide wall and at least two guide walls ending in a separating edge each with lateral end sections and with at least one bottom section disposed between said guide walls, thereby defining at least one opening on one side of said transverse edge and at least two openings on the other side of said transverse edge. Alternatively, the mixing element comprises mixer elements for separating the material to be mixed into a plurality of streams, as well as means for the layered merging of the same, including separating edges and a transverse edge that extends at an angle to said separating edges, as well as deflecting elements arranged at an angle to the longitudinal axis and provided with openings. Said mixing element comprises at least two separating edges with following guide walls with lateral end sections and with at least one bottom section disposed between said guide walls, and a transverse edge arranged at one end of a transverse guide wall, thereby defining at least one opening on one side of said transverse edge and at least two openings on the other side of said transverse edge.

A second embodiment of the supplementary fourth aspect refers to a dispensing apparatus comprising a multi-component cartridge and a static mixer as described above connected to the multi-component cartridge, with the multi-component cartridge preferably being filled with respective components.

A third embodiment of the supplementary fourth aspect refers to a method of assembling a static mixer, comprising a mixer housing, a mixing element and a mixer inlet section that are formed as separate elements. The method comprising the steps of: engaging a plug element of the mixing element and a counter plug element of the mixer inlet section; and guiding the engaged mixing element and mixer inlet section into the mixer housing to arrange at least a part of the mixing element within the mixer housing. The mixing element and the mixer inlet section are plugged together in a rotationally fixed manner by means of a plugged connection. The static mixer can preferably be further developed in accordance with any one of the preceding configurations.

A fourth embodiment of the supplementary fourth aspect refers to the use of a static mixer in accordance with any one of the above described configurations or of the above described dispensing apparatus to dispense components from a multi-component cartridge via the static mixer.

It has to be noted that the features of all of the above described aspects of the present invention and the further described supplementary aspects can be combined in various manners as long as no technical aspects prohibit any combination. Thus, a skilled artisan will be able to image various possibilities of implementing the present invention without leaving the scope of protection defined by the appending claims.

Reference numeral list for FIGS. 0-1 to 0-11C

1 mixer

2 retaining ring

3 cartridge

5 mixer housing

7 mixing configuration/mixing element

7a mixing element

7b mixing element

7c mixing element

9a first inlet opening

9b second inlet opening

11 dispense opening

13a first component reservoir/container

13b second component reservoir/container

15a first outlet opening

15b second outlet opening

17 connection means

18a connection protrusion

18b connection recess

19 alignment means

20a alignment protrusion

20b alignment recess

21 second alignment means

22a second alignment protrusion

22b second alignment recess

22b’ first section

22b” second section

29 cartridge head

30 end plate

31 ledge

35a first transitional opening

35b second transitional opening

37 first mixing chamber

39 second mixing chamber

41 inlay member 43a valve

43b valve

Reference numeral list for FIGS. 1-1 to 1-9

1 mixing element

1 a section

1 b section

1’ mixing element

1” mixing element

2 separating flange

2a plane

2b plane

2’ separating flange

2” separating flange

3 deflecting plate

3a plane

3b plane

3’ deflecting plate

4 passage hole/ open subarea

4’ open subarea

5 tube axis

6 fall line

7 boundary

7’ boundary

8 flow of the medium

8’ flow of the medium

8” flow of the medium

9 position of the creation of two partial stream

10 tube

20 upper edge

21 lower edge

23 lower edges

25 additional element

26 additional element

29 fitting position 30 deflection plate

30’ deflection plate

35 connection element a angle

Reference numeral list for FIGS. 2-1 to 2-15

1 mixer structure

1’ mixing elements

2 separating flange

2’ separating flange

3 deflection plate

3’ deflection plate

4 open subsurface

4 open subsurface

5 centerline

6a medium flow direction

6b medium flow direction

7a medium flow direction

7b medium flow direction

10 tube

11 rib

12 strip

13 strip

20 edge a1 entry passage a2 passage

A1 chamber

A2 chamber b1 entry passage b2 passage

B1 chamber

B2 chamber

B3 chamber C1 chamber

C2 chamber

C3 chamber e1 closed end e2 closed end

D1 chamber

D2 chamber

D3 chamber

51 re-layering chamber

52 re-layering chamber

S1’ re-layering chamber

S2’ re-layering chamber t1 exit passage t2 exit t1’ entry t2’ exit

T intermediate chamber

T’ intermediate chamber

Z axis

Reference numeral list for FIGS. 3-1 to 3-17

1 mixer

2 mixing element

2’ mixing element

2” mixing element

3 mixing enclosure

4 separating edge

4’ guide wall

5 separating edge

5’ guide wall

6 end section

7 end section

8 transversal edge

8’ transversal guide wall

9 bottom section bottom opening lateral opening lateral opening flow direction mixer mixing element ’ mixing element ” mixing element enclosure separating edge ’ guide wall separating edge ’ guide wall end section end section transversal edge bottom section bottom section opening lateral opening lateral opening first mixing group ’ second mixing group first helix mixing element’ second helix mixing element outlet edge entrance edge inlet inlet outlet opening outlet opening mixer mixing element arrangement inlet portion inlet ’ outlet inlet 43’ outlet

44 mixing section

45 first transversal edge

46 separating wall

47 first mixing group 47a mixing element 47b mixing element 47c mixing element 47d mixing element 47e mixing element

48 central mixing group 48a mixing element 48b mixing element

49 following mixing group 49a mixing element

49b mixing element 49c mixing element 49d mixing element 49e mixing element

50 guide wall

51 guide wall

52 web

53 web

54 web

55 guide wall

151 mixing element

152 web

TZV1 dead zone obturation TZV2 dead zone obturation TZV3 dead zone obturation TZV4 dead zone obturation ZL height ZQ height

Reference numeral list for FIGS. 4-1 a to 4-10 10 static mixer

12 mixer housing

14 mixer inlet section

16 mixing element

18a inlet

18b inlet

20a alignment means

20b alignment means

22a outlet

22b outlet

24a outlet opening

24b outlet opening

26 counter plug element

26a first groove

26b second groove

28 nose

30 plug element

32 output surface

34 recess

36 inlet

38 inlet

38a inlet opening

38b inlet opening

40 projection

42 groove

44a flow path

44b flow path

46 mixer element

48 transverse edge

50 guide wall

52 guide element

54 strut

56 wall section

58 groove

60 surface 62 first wall

64 second wall

66 recess

68 bulge

98 dispensing apparatus

100 multi-component cartridge

102a component

102b component

A longitudinal axis

Ma molding device

Mb molding device

Reference numeral list for FIGS. 5-1 to 5-58

1 mixer

2 mixer housing

3 mixer element group

3S first mixer element/ separating element

3D first dividing element

4 mixer outlet

5 mixer inlet section

6 inlet part

7 inlet part

8 rib

9 larger diameter

10 bayonet lug

11 bayonet lug

12 cartridge

13 container/ chamber

14 outlet

15 outlet

16 bayonet means

17 bayonet socket

18 internal recess

19 bayonet socket 20 bayonet socket

21 flange part

22 container

23 container

24 cartridge

25 mixer

26 mixer housing

27 mixer inlet section

28 inlet opening

29 inlet opening

30 slot

31 coupling ring

32 bayonet lug

33 bayonet lug

34 rib

35 cartridge

36 nose piece

37 mixer inlet section

38 mixer

39 inlet chamber

40 inlet chamber

42 cartridge

43 container/ chamber

44 lug

45 outlet

46 outlet

47 attaching means

48 undercut

49 circular edge

51 locking ring

52 inner circular groove

53 cartridge side edge

54 mixer side edge

55 cutout

56 cutout

57 cutout 58 serration

59 mixer

60 housing

61 closure cap

62 insert

63 male plug

63A second rim

64 bayonet lug

65 bayonet lug

67 closure cap

68 plug

69 slot

70 collar

71 closure cap

72 plug

73 bayonet lug

74 bayonet lug

75 cartridge

76 container

77 container

80 mixer

82 mixer inlet section

83 inlet part

84 inlet part

86 cartridge

86A cartridge front

87 container

89 nose piece

90 slotted prong

91 guide piece

92 bayonet flange

93 bayonet flange

94 mixer bayonet flange part

95 mixer bayonet flange part

96 mixer cutout

97 mixer cutout 8 reduced diameter cutout

99 reduced diameter cutout

100 attachment means

101 mixer

102 mixer housing

103 mixer inlet section

104 inlet

105 inlet

106 larger diameter

107 bayonet lug

108 bayonet lug

109 cartridge

110 container

111 container

112 female outlet

113 female outlet

114 cartridge front

116 mixer housing

117 mixer inlet section

117A chamber

117B chamber

118 separate male inlet

119 separate male inlet

120 larger diameter

121 bayonet lug

122 bayonet lug

123 cartridge

124 container

125 container

126 male outlet

127 female outlet

128 cartridge front

130 mixer

131 mixer housing

132 mixer inlet section

133 male inlet 133A separating chamber

134 male inlet

134A separating chamber

135 larger diameter

136 bayonet lug 136A rib

137 bayonet lug

137A rib

138 cartridge

139 container

140 container

141 female outlet

142 female outlet

143 cartridge front

145 bayonet socket

145A rib

146 bayonet socket 146A rib

149 cutout

150 cutout

151 protrusion

152 protrusion

153 marking

154 marking

155 mixer

156 mixer housing

157 inlet

157A chamber/ separating means 157B male inlet

157C chamber

158 inlet

158A chamber/ separating means 158B male inlet

158C chamber

159 larger diameter

159A second part 160 bayonet lug

160A bayonet lug

161 bayonet lug

161 A bayonet lug

162 cartridge

163 container

164 container

165 female outlet

166 female outlet

167 rib

168 cartridge front

169 bayonet socket

170 bayonet socket

171 cutout

172 cutout

173 mixer

174 mixer housing

176 male inlet

176A chamber

177 male inlet

177A chamber

178 larger diameter

179 bayonet socket 179A rib

180 bayonet socket 180A rib

181 cutout

182 cutout

183 cartridge

184 container

185 container

186 female outlet

187 female outlet

188 cartridge front

190 bayonet lug 190A rib 191 bayonet lug 191A rib

192 V-shape nose

193 V-shape incision

194 gaps/ cutout 194A cutout

195 gaps/ cutout 195A cutout

196 coupling ring

197 mixer inlet part

198 ridge

199 groove

200 mixer

201 mixer housing

210 cartridge

211 cartridge front

212 coding protrusion

213 pin

214 mixer

215 coding protrusion

216 pin

217 bar

218 bar

219 D-shaped protrusion

220 D-shaped protrusion

221 male plug

222 female plug

223 male plug

224 female plug

225 bar

226 bar

227 bar

228 bar

L air gap