This invention relates to a product mixer, comprising:

- a fixed base defining a bearing surface;

- a sample-holder;

- a drive mechanism, comprising a drive shaft rotatably mounted with respect to the base about a main axis;

- a connection mechanism between the drive mechanism and the sample-holder to enable the driving in rotation of the sample-holder about the main axis by means of the drive shaft, the connection mechanism allowing a rotation between the sample-holder and the drive mechanism about a secondary axis separate from the main axis; the connection mechanism including a member for driving the sample-holder in rotation about the secondary axis, disposed in contact with the bearing surface.

The mixer is in particular intended for the preparation of a cosmetic product carried out by mixing a composition including several constituents.

The cosmetic product is for example a cosmetic body surface care, coloring or/and makeup product.

More generally, a cosmetic product is as defined in EC Regulation No. 1223/2009 of the European Parliament and the Council of November 30, 2009, relating to cosmetic products.

The cosmetic products generally consist of a plurality of constituents to be mixed to obtain a homogeneous composition having substantially constant properties throughout the volume thereof. This mixing is frequently carried out on a large scale in a manufacturing facility, before packaging fractions of the mixture into successive packages.

In some cases, the cosmetic product is prepared directly before being sold to the consumer, or directly by the consumer. The preparation generally includes dosing the different constituents, optionally heating, followed by mixing the composition obtained.

The mixing must be very effective to ensure satisfactory homogeneity of the product. For this purpose, it is known for example from the document US 4 235 553 to use mixers of the type cited above which are generally referred to using the term“planetary mixer”. These mixers induce a dual rotation of the product to be mixed on two axes disposed for example at 45° in relation to one another, the sample-holder rotating generally about a main axis and rotating about a secondary axis with which it is coaxial.

Such a mixture is very effective, but is not fully satisfactory. Indeed, this type of mixer comprises a motor equipped with a vertical drive shaft, a sample-holder support, borne by the drive shaft in the shaft axis, the sample-holder between rotatably mounted in the support.

For this reason, when the receptacle containing the product is placed in the sample- holder, the entire weight thereof rests on the drive shaft, in addition to the weight of the sample-holder and the weight of the support. This implies that the motor and the drive shaft must be very robust, since they support all of the weights cited above.

Furthermore, the cumulative weights of the product and the receptacle thereof, the sample-holder and the support induce bending stress of the main shaft, with vibratory effects at high rotational speed.

To eliminate the vibrations, it is necessary to envisage damping strategies, such as counterweights, which are complex, risky or expensive, and not necessarily very effective.

Thus, all the mixers of the type cited above inevitably vibrate, at least in a frequency range specific to each machine during acceleration and deceleration.

In order to meet mechanical quality requirements, it is therefore necessary to envisage materials of high mechanical strength for the drive shaft and for the motor, in particular when the latter is rotated at high speed. These mechanical requirements are necessary to ensure the safety of the mixer and result in a high cost.

An aim of the invention is that of obtaining a product mixer that provides very effective mixing, but with a simple and inexpensive mechanical solution.

To this effect, the invention relates to a mixer of the type cited above, characterized in that the connection mechanism vertically uncouples the sample-holder from the drive mechanism so that at least a portion of the weight of the sample-holder is applied on the base.

The vertical uncoupling between the sample-holder and the drive shaft ensures that at least a portion of the weight of the sample-holder no longer rests on the shaft but directly on the base, advantageously by means of the member for driving in rotation about the second axis.

The mixer is planetary, and therefore offers very effective mixing, without requiring costly parts, in particular in terms of the drive motor and the drive shaft. Furthermore, the manufacturing tolerances may be reduced, which is also beneficial in terms of cost.

The mixer according to the invention can include one or more of the following features, taken alone or in any technically possible combination:

According to an advantageous feature, at least 50% of the weight, advantageously at least 90% of the weight of the sample-holder is applied on the base. Preferably, most, or all, of the weight of the sample-holder containing the product to be mixed is taken up by the base, which minimizes the occurrence of vibrations and minimizes costs for mechanical components such as the motor and drive shaft.

According to advantageous alternative embodiments: the drive member is a wheel of coaxial axis with the secondary axis;

- the drive member is disposed at the lower end of the sample-holder or is disposed on the entire length of the sample-holder, or is disposed at both ends of the sample-holder;

- the member for driving in rotation is formed of a plastic material, particularly of a polyurethane or a rubber and,

- the secondary axis of rotation of the sample-holder with respect to the shaft is inclined with respect to the main axis by an angle of between 0° and 70°, a lower end of the sample-holder being situated closer to the main axis than an upper end of the sample-holder or the secondary axis of rotation of the sample-holder with respect to the shaft is inclined with respect to the main axis by an angle of between 0° and -70°, a lower end of the sample- holder being situated farther from the main axis than an upper end of the sample-holder.

The drive member consisting of a wheel, preferably made of rubber and advantageously inclined with respect to the main axis of rotation, takes up the weight of the sample-holder containing the product to be mixed, and simultaneously offers very effective driving in rotation of the sample-holder about the secondary axis of rotation. The cost of such a solution is further reduced, since the wheel can be replaced easily and represents a wear part.

According to a further advantageous alternative embodiment, the sample-holder defines a reception cavity for a receptacle containing the product, or is a receptacle containing the product.

According to an advantageous alternative embodiment, the base has a transverse wall with respect to the main axis, the transverse wall defining the bearing surface, the drive shaft traversing the transverse wall, or the bearing surface is inclined with respect to the main axis, or the bearing surface is a cylindrical surface of coaxial axis with the main axis and in the direction of the main axis and,

the transverse wall delimits a support surface, the connection mechanism comprising a revolving plate mounted integral in rotation with the drive shaft on top of the support surface and a bearing inserted between the revolving plate and the support surface.

The presence of a plate mounted integral in rotation with the main shaft and resting on the traverse surface of the base further reduces the stress applied to the shaft and the motor and ensures very effective, vibration-free operation. According to the alternative embodiments, the connection mechanism includes a connection rod between the rotary drive mechanism and the sample-holder, the connection rod being rotatably mounted about at least one axis with respect to the drive mechanism or the sample-holder and,

the connection rod is connected to at least one element of the drive mechanism or/and the sample-holder by a swivel connection.

The presence of a connection rod, optionally associated with a swivel connection provides a very effective and inexpensive vertical uncoupling between the rotary drive mechanism and the sample-holder, which further generates very few vibrations.

The sample-holder is suitable for pivoting with respect to the axis, between an inclined stable position disposed bearing on a bearing surface and an upright position for loading the sample-holder and,

the drive mechanism comprises a drive motor of the drive shaft, advantageously an electric motor.

The invention also relates to a method for preparing a product, including the following steps:

- provision of a mixer as defined above;

- arrangement of the product in the sample-holder;

- driving in rotation of the drive shaft about the main axis and joint rotation of the sample-holder about the main axis;

- movement of the member for driving in rotation about the secondary axis, on the bearing surface;

- driving in rotation of the sample-holder about the secondary axis by the drive member;

- vertical uncoupling between the sample-holder and the connection axis, at least a portion of the weight of the sample-holder resting on the base.

According to one advantageous alternative embodiment, the method according to the invention may comprise:

- the arrangement of the product in the sample-holder includes prior pivoting of the sample-holder with respect to the axis, between an inclined stable position disposed bearing on the bearing surface and an upright position for loading the sample-holder and,

- a preliminary step of preparing the product, the product being preferably a cosmetic product, the preliminary preparation step including:

^* positioning of capsules in the housing of a structure of a preparation device, the housing extending along a longitudinal axis and positioning of a receptacle or a preform connected to an outlet nozzle of the preparation device; ^* movement of a piston of the preparation device in the housing along the longitudinal axis and perforation of the capsules on either side of each capsule to convey the contents of each capsule toward the end;

^* extrusion of the contents of each capsule into the receptacle or into the preform, through the outlet nozzle.

The use of the mixer according to the invention is particularly effective in combination with a preparation device based on a plurality of capsules which are extruded coaxially by a piston circulating in the capsules. This makes it possible to prepare very homogeneous cosmetic products very inexpensively and safely.

The invention also relates to a kit including:

- a mixer as defined above;

- a device for preparing a product including:

^* a structure defining a housing extending along a longitudinal axis,

^* a piston free to move in translation in relation to the structure along the longitudinal axis in the housing, and

^* an outlet nozzle opening at one end of the housing, suitable for being fluidically connected to a receptacle or to a preform intended to form a receptacle,

wherein the housing removably receives a plurality of capsules each comprising a substantially cylindrical outer wall, the capsules being aligned coaxially along the longitudinal axis, at least one of the capsules containing at least one constituent of the product, the piston being mounted free to move through the capsules to successively perforate each capsule and convey a content of each capsule to the outlet nozzle.

The invention will be easier to understand after reading the following description, provided solely as an example, and with reference to the appended drawings, wherein:

[Fig 1] figure 1 is a schematic diagram, from a partial sectional view along a median vertical plane, of a first mixer according to the invention;

[Fig 2] figure 2 is a top view of a member for driving in rotation about a secondary axis of the mixer in figure 1 ;

[Fig 3] figure 3 is a schematic diagram, from a partial sectional view along a median vertical plane, of a second mixer according to the invention;

[Fig 4] figure 4 is a schematic diagram, from a partial sectional view along a median vertical plane, of a third mixer according to the invention;

[Fig 5] figure 5 is a longitudinal sectional view of a device for preparing a cosmetic product intended to be mixed in the mixer of one of figures 1 , 3 or 4.

A first product mixer 1 10, particularly of cosmetic product, is represented schematically in figures 1 and 2. The mixer 1 10 is particularly intended to stir a cosmetic composition previously prepared in a preparation device, from a plurality of constituents. The cosmetic product is a cosmetic body surface makeup, care and/or coloring product.

Alternatively, the mixer 1 10 is intended to prepare a non-cosmetic product, for example adhesives, modelling clays, agri-food products, such as sauces or dairy products, paints, tints.

As illustrated by figure 1 , the mixer 1 10 includes a fixed base 1 14, at least one sample-holder 1 16 intended to contain the product 1 12 to be mixed, the sample-holder 1 16 being free to move with respect to the base 1 14 on one hand, about a main axis A-A’ of rotation and on the other, about a secondary axis B-B’ of rotation in turn rotating about the main axis A-A’.

The mixer 1 10 further includes a drive mechanism 1 18 of the sample-holder 1 16, rotatably mounted with respect to the base 1 14 about the main axis A-A’, and a connection mechanism 120 between the drive mechanism 1 18 and the or each sample-holder 1 16, suitable for enabling the driving in rotation of the sample-holder 1 16 about the main axis A- A’ by allowing a rotation between the sample-holder 1 16 and the drive mechanism 1 18 about the secondary axis B-B’.

The fixed base 1 14 includes a frame 122 intended to be placed on the ground or on a support located away from the ground, and an upper transverse wall 124 for supporting the or each sample-holder 1 16.

The transverse wall 124 has herein a peripherical edge 126. The edge 126 delimits at the top a circumferential bearing surface 128 of the sample-holder 1 16, located radially away from the main axis A-A’.

The transverse wall 124 has at the center thereof a bowl 130 delimited on the side by the edge 126.

The bottom of the bowl 130 defines a surface 132 for supporting the drive mechanism 1 18 and a central through-hole 134 coaxial with the main axis A-A’. The central hole 134 opens at the bottom into the frame 122 and at the top into the bowl 130 at the level of the main axis A-A’.

In this example, the sample-holder 1 16 includes a receptacle 140 delimiting a reception cavity 142 for a receptacle containing the product to be mixed. Alternatively, the receptacle containing the product to be mixed forms the sample-holder 1 16 directly.

The sample-holder 1 16 is borne by the bearing surface 128. It protrudes along the inclined secondary axis B-B’ with respect to the main axis A-A’, on top of the bearing surface 128 and partially on top of the bowl 130, away from the main axis A-A’. The angle a formed between the secondary axis B-B’ and the main axis A-A’, measured at the top, is advantageously between 20° and 70°, when the sample-holder 1 16 is disposed bearing on the bearing surface 128.

The sample-holder 1 16 is suitable for pivoting with respect to the axis A-A’, toward the axis A-A’ between the stable position disposed bearing on the bearing surface 128 and a loading position wherein the angle a falls below 20° and temporarily reaches 0° to facilitate the loading of the sample-holder 1 16.

The operator or centrifugal force alone then readily inclines the sample-holder 1 16 in the stable position thereof bearing on the bearing surface 128.

If the sample-holder 1 16 is inclined by 0° to 70°, the sample-holder 1 16 is offset transversally from the axis A-A’, perpendicularly to the axis A-A’, by a minimum distance DM practically equal to 0% of the maximum width LM of the sample-holder 1 16, taken perpendicularly to the secondary axis B-B’.

The number of sample-holders 1 16 is preferably greater than 2, particularly between 3 and 6.

The drive mechanism 1 18 includes a motor 150, and a drive shaft 152 driven in rotation about the main axis A-A’ by the motor 150. It advantageously comprises a revolving plate 154 driven in rotation about the main axis A-A’ by the drive shaft 152, and a bearing 156, disposed between the revolving plate 154 and the support surface 132.

The motor 150 is for example an electric, hydraulic and/or thermal motor. It is suitable for driving the drive shaft in rotation about the main axis A-A’ at a speed advantageously greater than 1000 rpm and particularly between 1500 rpm and 3000 rpm.

The motor 150 is herein housed in the frame 122 of the base 1 14.

The drive rod 152 extends vertically along the main axis A-A’. It protrudes through the central hole 134 at least up to the bowl 130.

The revolving plate 154 is mounted integral in rotation with the drive shaft 152 about the main axis A-A’. It extends radially from the main axis A-A’ into the bowl 130, facing the support surface 132. It defines at the periphery thereof reception housings 158 for the connection mechanism 120, which will be described hereinafter.

The bearing 156 is for example a ball bearing inserted between a lower surface of the revolving plate 154 and the support surface 132. It ensures partial take-up of the weight of the plate 154 by the support surface 132, while limiting friction during the rotation of the revolving plate 154 about the main axis A-A’.

The connection mechanism 120 includes, for the or each sample-holder 1 16, a connection rod 160 with the drive mechanism 1 18, and a member 162 for driving the sample-holder 1 16 in rotation about the secondary axis B-B’. The connection rod 160 connects the revolving plate 154 to the sample-holder 1 16. In this example, the connection rod 160 has at the end thereof near the axis A-A’, a swivel 164 housed in the housing 158. At the end thereof removed from the axis A-A’, the connection rod 160 is attached to the sample-holder 1 16 and is advantageously integral in rotation about the secondary axis B-B’ with the sample-holder 1 16.

Thanks to the swivel connection between the connection rod 160 and the revolving plate 154, the sample-holder 1 16 is suitable for being driven in rotation about the main axis A-A’ by the connection rod 160.

The sample-holder 1 16 is further suitable for rotating simultaneously about the secondary axis B-B’ with respect to the mechanism 158 for driving in rotation during the rotation about the main axis A-A’.

Furthermore, the connection rod 160 is at least partially free to rotate about a horizontal axis, for example a horizontal axis perpendicular to a plane defined by the axes A-A’ and B-B’.

Thus, the connection rod 160 vertically uncouples the sample-holder 1 16 from the revolving plate 154, and more generally, from the drive mechanism 1 18.

The weight of the sample-holder 1 16, particularly when it contains the product to be mixed, is therefore not applied vertically on the drive mechanism 1 18, since the connection rod 160 is free to pivot horizontally at the end thereof.

The drive member 162 is herein a wheel 165, suitable for rolling on the bearing surface 128. The wheel 165 extends for example to the lower periphery of the sample- holder 1 16 about the outer surface of the sample-holder 1 16.

The wheel 165 is for example made of a wear material, such as a plastic material such as polyurethane or rubber. The wheel 165 is for example a skateboard wheel. The axis of the wheel 165 is herein coaxial with the secondary axis of rotation B-B’. The wheel 165 is integral in rotation with the sample-holder 1 16.

The wheel 165 is applied on the bearing surface 128. It ensures the take-up of the weight of the sample-holder 1 16 by the base 1 14.

Furthermore, the wheel 165 keeps the secondary axis of rotation B-B’ inclined with respect to the main axis A-A’.

When the sample-holder 1 16 is driven in rotation about the main axis A-A’ via the connection rod 160, the drive member 162 is suitable for rolling on the bearing surface 128, triggering the driving in rotation of the sample-holder about the secondary axis B-B’.

The drive member 162, in combination with the vertical uncoupling provided by the connection rod 160 therefore ensures that the majority of the weight of the sample- holder 1 16 and the product contained therein, preferably substantially all of the weight of the sample-holder 1 16 is taken up by the fixed base 1 14, by means of the contact between the member 162 for driving in rotation and the bearing surface 128.

Thus, the weight of the sample-holder 160, containing the product to be mixed is not transmitted to the revolving plate 154, to the drive shaft 152 and to the motor 150. The motor 150, the drive shaft 152 and the revolving plate 154 can therefore be specified with a lower mechanical strength, which reduces the cost thereof. Furthermore, in the absence of weight applied directly on the shaft 152 and/or the motor 150, the buckling of the drive shaft 152 is decreased considerably, consequently reducing the vibrations induced by rotation.

The operation of the mixer 1 10 according to the invention will now be described.

Initially, the product to be mixed is loaded into the sample-holder 1 16 either directly, or by means of a receptacle containing the product which is introduced into the cavity 142. The sample-holder 1 16 is positioned, with the drive member 162 disposed bearing on the bearing surface 128.

Advantageously, the sample-holder 1 16 is pivoted with respect to the axis A-A’, toward the axis A-A’ between the stable position disposed bearing on the bearing surface 128 and a loading position wherein the angle a falls below 20° and temporarily reaches 0° to facilitate the loading of the sample-holder 1 16.

The connection rod 160 connects the sample-holder 1 16 to the revolving plate 154, vertically uncoupling the sample-holder 1 16 from the drive shaft 152 and the motor 150.

Thus, practically all of the weight of the sample-holder 1 16 containing the product to be mixed is taken up by the base 1 14.

The swivel connection on the connection rod 160 makes it possible to readily adjust the angle of inclination of the sample-holder 1 16 via the adjustment of the height and/or the relative distance between the connection rod 160 and the bearing surface 128.

Then, the motor 150 is activated. The motor 150 drives the drive shaft 152 about the main axis A-A’, moving the revolving plate 154 at the same time.

The rotation of the revolving plate 154 produces an overall rotation of each connection rod 160 about the axis A-A’ which also moves the or each sample-holder 1 16 about this axis A-A’.

At the same time, the drive member 162 rolls on the bearing surface 128 driving the sample-holder 1 16 in rotation about the secondary axis B-B’, producing both a rotation of the product to be mixed globally about the main axis A-A’, but also a rotation of the product to be mixed about the secondary axis B-B’. The planetary mixing of the product is extremely effective. This mixing is obtained with minimum bearing on the drive shaft 152 and on the motor 150, which limits the wear of these parts, and the buckling applied on this shaft, reducing vibrations.

Moreover, the drive members 162 being formed of wheels 164 consisting of a wear material, they can be replaced readily and at a low cost, when they are worn.

In an alternative embodiment, described in figure 3, the sample-holder 1 16 is inclined by -0° to -70°, toward the axis A-A’ from bottom to top. The connection rod 160 is then equipped, at the end thereof removed from the axis A-A’ with a bearing 200 connecting same to the sample-holder 1 16, allowing a rotation of the sample-holder 1 16 about the axis B-B’ thereof.

The bearing surface 128 is advantageously inclined for example by 45° with respect to the main axis A-A’.

In a further alternative embodiment, represented in figure 4, the sample-holder 1 16 is tangent to the axis A-A’ or intersects the axis A-A’.

In this case, the bearing surface 128 is a cylindrical surface of axis A-A’ directed toward the axis A-A’ extending along the upper prolongation of the top wall 124. The drive member 162 then rolls along the cylindrical surface.

In the alternative embodiment where the sample-holder 1 16 intersects the axis A- A’, there is only one sample-holder 1 16.

In the alternative embodiments in figures 3 or 4, the device 10 is particularly compact. Furthermore, the risk of leakage of the product to be mixed during the rapid rotation of the sample-holder about the axis A-A’ is reduced thanks to the orientation of the sample-holder 1 16 toward the axis A-A’.

In alternative embodiments, not shown, the drive member 162 is disposed along the entire length of the sample-holder 1 16, or at both ends of the sample-holder 1 16.

Advantageously, the product to be mixed is a composition, particularly a cosmetic composition prepared using a device 10 described in one of the French applications FR 18 54316, FR 18 54306, FR 18 5431 1 , FR 18 54312 and FR 18 71775.

It is prepared particularly based on a least one capsule 16 (seen in figure 5), preferably based on a plurality of capsules 16 mounted coaxially in the preparation device 10.

Each capsule 16 contains at least one of the constituents of the composition intended to form the product to be mixed 1 12.

Each capsule 16 comprises a substantially cylindrical side wall 18, defining a substantially cylindrical inner conduit 20 and two seals 22 closing the inner conduit 20 at two opposite ends. The term "cylindrical" denotes that the side wall 18 and the inner conduit 20 each have an outer surface in the shape of a cylinder portion, a cylinder being understood to be the geometric shape formed by a generatrix passing through a closed directrix curve inscribed in an orthogonal plane to the generatrix.

According to a first alternative embodiment, the directrix curve is a circle, and the side wall 18 is thus in the shape of a cylinder portion of circular transverse cross-section.

According to further alternative embodiments, the directrix curve is a square, a rectangle, an ellipse, a rhombus, or other shape.

The above definition is applied in the same way hereinafter to any cylindrical object.

The side wall 18 and the inner conduit 20 each have a central axis, which passes through an isobarycenter of the respective directrix curve. The central axes of the side wall 18 and of the inner conduit 20 are particularly coincident.

The side wall 18 is in the form of a solid cylindrical sleeve having a substantially constant thickness on the periphery thereof, and a variable length from one capsule 16 to another. The side wall 18 is for example made of plastic material, and particularly of material transparent to near infrared radiation, such as for example methyl polymethacrylate. Alternatively, the side wall 18 is made of glass.

The plurality of capsules 16 particularly comprises at least one first capsule 16 and at least one second capsule 16.

The side wall 18 of each first capsule 16 has the same first outer diameter di and the same first inner diameter d’i . The side wall 18 of each second capsule 16 has the same second outer diameter greater than the first outer diameter di , and the same second inner diameter d’2, greater than the first inner diameter d’1.

In the example shown in the figures, the side wall 18 and the inner conduit 20 are cylindrical with a circular cross-section. In cases where the cross-section of the cylinder is not a circle, the inner d’1 , d’2 and outer diameters di , d2 should be considered as transversal dimensions of the capsules 16, such as for example the side of a square cross-section, or the major axis of an elliptical cross-section.

Each first capsule 16 further comprises fins 24 protruding laterally from the side wall 18, ends of the fins 24 being inscribed in a circle of diameter equal to the second outer diameter d2. The fins 24 are for example of a single piece with the side wall 18.

Each first capsule 16 advantageously comprises at least three fins 24, which helps ensure effective centering of the capsule 16 when it is placed in the device 10.

The seals 22 have a thin disk shape and have a diameter substantially equal to the outer diameter di , d2 of the side wall 18. The seals 22 are attached to a transversal surface of the side wall 18, for example by heat-sealing. The seals 22 are made of a stretchable material fragile enough to tear when the seals 22 are stretched beyond a rupture threshold. The seals 22 are for example made of rubber, particularly based on a butadiene-acrylonitrile copolymer (referred to as nitrile rubber), or based on polychloroprene.

The material forming the seals 22 is advantageously recyclable, particularly by pyrolysis.

Alternatively, the seals 22 are made of a fragile material, the presence whereof in the composition causes no discomfort, such as for example from sugar, gelatin, wax or others.

The inner conduit 20 receives contents of the capsule 16, comprising at least one of the constituents of the composition 12.

Each capsule 16 has a specific length, measured between the two ends of the inner conduit 20, and independent of the inner diameter of the capsule 16. The length is determined according to the volume sought for the inner conduit 20, which is dependent on the nature of the contents of the cosmetic composition 12.

Advantageously, the side wall 18 of each capsule 16 has one or a plurality of specific colors, suitable for quickly identifying the contents of the capsule 16 even once the capsule has been placed in the device 10.

The device 10 comprises a structure 28 defining a housing 30 for receiving the capsules 16, extending along a longitudinal axis X-X’. The device 10 also comprises an outlet nozzle 32 opening at a first end 34 of the housing 30, and a piston 36 mounted at a second end 38 of the housing 30.

The device 10 is particularly positioned vertically, that is to say that the longitudinal axis X-X’ extends parallel with gravity, with the outlet nozzle 32 oriented upward, that is to say opening opposite the direction of gravity.

The structure 28 comprises for example a substantially cylindrical casing 40 which defines the housing 30, the outlet nozzle 32 being positioned through the casing 40 and the piston 36 being slidably mounted through the casing 40.

The casing 40 advantageously has openings for accessing the capsules 16. Alternatively, the casing 40 is made of material transparent to near infrared.

Alternatively (not shown), the structure 28 is an open structure comprising a plurality of metal bars extending substantially parallel with the longitudinal axis X-X’, defining therebetween the housing 30. The bars are assembled with two end plates, forming the ends of the housing 30, one of the plates comprising the outlet nozzle 32 and the other plate bearing the piston 36. The bars are arranged to serve as lateral support for the ends of the fins 24 of the first capsules 16 and for the side wall 18 of the second capsules 16. Advantageously, each bar comprises a groove extending facing the housing 30, the grooves being suitable for receiving the ends of the fins 24 of the first capsules 16, so as to prevent the rotation of the first capsules 16 about the longitudinal axis X-X’.

A portion of the structure 28 is movable and/or removable so as to enable the positioning of the capsules 16 in the housing 30.

The housing 30 is a substantially cylindrical internal volume, having a diameter substantially equal to the second outer diameter d2 of the capsules 16. The housing is suitable for receiving the capsules 16 removably, pressing radially on an internal surface of the housing 30.

The definitions of the terms "cylindrical", "axis" and "diameter" given above also apply to the housing 30 and to the piston 36. In particular, the cross-sections of the capsules 16, the housing 30 and the piston 36 are similar.

The capsules 16 received in the housing 30 are aligned along the longitudinal axis X-X’, in a coaxial manner. The term coaxial denotes that each of the capsules 16 is arranged with an axis of the inner conduit 20 of the capsule 16 aligned on the longitudinal axis X-X’.

The capsules 16 are arranged in contact with one another, the second capsules 16 being arranged closer to the outlet nozzle 32 situated at the first end 34, and the first capsules 16 being arranged closer to the piston 36 situated at the second end 38.

The side walls 18 of the first capsules 16 are in contact against one another along a parallel direction with the longitudinal axis X-X’, so as to form a first circulation conduit having a diameter equal to the first inner diameter d’i .

Similarly, the side walls 18 of the second capsules 16 press against one another along a parallel direction with the longitudinal axis X-X’, so as to form a second circulation conduit having a diameter equal to the second inner diameter d’2.

Advantageously, the device 10 also comprises a block 46, slidably mounted in the housing 30, suitable for pressing against the capsule 16 closest to the second end 38 and for fastening capsules 16 pressing against the first end 34 of the housing 30. The block 46 includes a central opening 48 enabling the passage of the piston 36 and access to the inner conduit 20 of the capsules 16.

The block 46 presses on a capsule 16 situated at one end of the stack of capsules 16 to keep the capsules 16 in contact with one another.

The outlet nozzle 32 comprises an opening 50 in the structure 28 opening to the outside of the structure 28 on one side and into the housing 30 on the other, as well as fastening means 52 of the receptacle or of a preform 54.

The opening 50 is particularly a circular opening centered on the longitudinal axis X-

X’. The fastening means 52 comprise for example a thread extending onto an internal surface of the opening 50, suitable for engaging with the thread of the receptacle or of the preform 54.

Alternatively, the fastening means 52 comprise a clip, bayonet, pin, or other, system.

The piston 36 is mounted on the structure 28, free to move in translation relative to the structure 28 along the longitudinal axis X-X’ in the housing 30, toward the first end 34.

The piston 36 is also free to move through the capsules 16, and suitable for successively stretching the seals 22 of each of the capsules 16 to the rupture threshold thereof, and conveying the contents of the capsule 16 toward the outlet nozzle 32.

The piston 36 comprises a rod 56 extending along the longitudinal axis X-X’, as well at least one piston head arranged in the housing 30, suitable for being set in motion by the rod 56.

The piston 36 particularly comprises as many heads, having different outer diameters, as the number of different inner diameters among the capsules 16. The heads are arranged in the housing 30 at a distance from one another along the longitudinal axis X-X’, according to an increasing order of diameter toward the first end 34 of the housing 30.

Each head 58, 60 is arranged upstream from the capsule 16 having an inner diameter substantially equal to the outer diameter of the head furthest from the outlet nozzle 32.

In the example shown in figure 5, the piston 36 comprises a first head 58 and a second head 60, having two different outer diameters, substantially equal respectively to the first inner diameter d’i and to the second inner diameter d of the capsules 16.

The first head 58 is arranged in contact with the first capsule 16 furthest from the outlet nozzle 32, and the second head 60 is arranged in contact with the second capsule 16 furthest from the outlet nozzle 32.

Each head 58, 60 is arranged to be assembled successively on the rod 56 during the movement of the piston 36 through the housing 30.

In the example shown in the figures, the first head 58 is arranged to be assembled on the rod 56 before passing the piston 36 through the first capsules 16, and the second head 60 is arranged to be assembled on the rod 56 before passing the piston 36 through the second capsules 16.

Each head, with the exception of the head 58 having the smallest outer diameter, defines a through conduit 62, opening onto two opposite faces of the head along the longitudinal axis X-X’.

Advantageously, each conduit 62 is suitable for receiving in a complementary manner the preceding head, particularly in a snap-locking manner . The head received is suitable for sealing the conduit 62 tightly, and preventing the flow of the contents of the capsules 16 through the conduit 62.

In the example shown in the figures, the second head 60 defines the conduit 62, which has an inner diameter substantially equal to the outer diameter of the first head 58.

The conduit 62 has a rib 64 extending inside the conduit 62, about an inlet of the conduit 62. The rib 64 reduces the diameter of the conduit at the level of 62 the inlet, so as to fasten the first head 58 received in the conduit 62 by snap-locking.

Advantageously, at least one of the heads of the piston 36 is suitable for forming a plug of the receptacle connected to the outlet nozzle 32. In particular, all the heads of the piston 36 are suitable for engaging to form the plug.

The plug is arranged across an inlet of the receptacle, after the flow of the composition 12 into the receptacle. The piston heads 36 are separable from the rod 56 when the receptacle is detached from the outlet nozzle 32 for dispensing the composition 12.

The plug is particularly suitable for being perforated after the detachment of the receptacle from the outlet nozzle 32, prior to a first use of the cosmetic composition 12 contained in the receptacle.

Advantageously, the plug is suitable for receiving a member for dispensing the composition 12, particularly during the perforation of the plug. The dispensing member is for example a pump, a dispensing bead, an application brush, a nozzle, a cap, a hinged lid, or other member.

Alternatively, the plug is a rear plug of the receptacle, which is intended to be opened on the opposite side of the dispensing plug. This case corresponds for example to cosmetic compositions 12 presented in "stick" form, such as for example a lipstick.

According to a first embodiment, shown in figure 5, the device 10 comprises a preform 54 received by the outlet nozzle 32, as well as a mold 68 for forming the receptacle.

The preform 54 comprises a part 71 made of plastic material, suitable for being heated then deformed irreversibly to form the receptacle receiving the composition 12, as well as a retaining ring 73 surrounding the part 71 .

The part 71 is particularly suitable for being deformed by the contents of the capsules 16 flowing through the outlet nozzle 32.

The part 71 is particularly rigid at ambient temperature and suitable for softening above a softening temperature, so as to be deformed freely during the flow of the contents from the capsules 16.

Alternatively, the part 71 is suitable for being deformed at ambient temperature, particularly in an elastic, that is to say substantially reversible, manner, during the conveyance of the contents from the capsules 16. The part 71 is for example made of rubber.

The preform 54 has an inner surface 72 of the part 71 , facing the housing 30, and an outer surface 74, facing the outside and/or the mold 68. The inner surface 72 is intended to be in contact with the contents of the capsules 16 during the deformation of the preform 54 and to receive the pressure causing the deformation. The outer surface 74 is intended to come into contact with the mold 68 following the deformation of the preform 54.

The inner surface 72 and the outer surface 74 are non-hollow, that is to say the inner surface 72 and the outer surface 74 are flat or slightly concave. The term "slightly concave" denotes that a maximum depth of the concavity is less than half a transversal thickness of the part 71 , measured along the longitudinal axis X-X’, and advantageously less than or equal to one quarter of the transversal thickness.

Thus, the part 71 has a shape fully inscribed in a cylinder delimited by two planar surfaces, wherein are inscribed the lateral edges of the inner surface 72 and of the outer surface 74 respectively.

According to a preferred embodiment, shown in figure 5, the inner surface 72 is non concave, particularly substantially planar, and the outer surface 74 is non-convex, particularly substantially planar. The part 71 is then substantially cylindrical, and is engaged in the retaining ring 73 via a lateral surface.

According to one alternative embodiment, the inner surface 72 is concave, and the outer surface 74 is convex. The part 71 for example an elongated tube having a rounded closed end and an open end engaged in the retaining ring 73.

Preferably, the preform 54 is flat. It has a height, measured along the longitudinal axis X-X’ thereof, less than the diameter thereof, preferably less than 0.5 times the diameter thereof.

The retaining ring 73 has a lateral thread, for fastening the preform 54 to the outlet nozzle 32. The retaining ring 73 is composed of a more heat-resistant material than the part 71 , so as not to be degraded when the part 71 is heated and then deformed.

The retaining ring 73 has a smaller inner diameter than the outer diameter d2 of the capsules 16, such that the retaining ring 73, when it is engaged in the thread 54, blocks a translation movement of the capsules 16 along the longitudinal axis X-X’ in the housing 30.

The mold 68 is a surface for forming the preform 54 to obtain the receptacle, made for example of metal exhibiting good heat conduction properties.

The mold 68 is for example arranged to enable the removal of the receptacle containing the composition 12, once the preform 54 has been formed, and to be put back in place for another use. Alternatively, the mold 68 is single-use and is part of the receptacle containing the composition 12.

According to a second embodiment (not shown), the device 10 includes a receptacle fastened to the outlet nozzle 32, and suitable for receiving the constituents of the composition 12 flowing through the outlet nozzle 32.

The receptacle is for example a folded flexible bag comprising an opening, whereby the retaining ring 73 is fastened tightly for the fastening thereof to the outlet nozzle 32. The bag is made of a flexible and impervious material.

Advantageously, the receptacle contains no air when it is positioned on the outlet nozzle 32, making it possible to prevent any contamination of the composition 12. Alternatively, the receptacle initially contains a neutral gas suitable for preserving the composition 12.

Advantageously, the device 10 also comprises a device 80 for heating the capsules 16, arranged in the vicinity of the housing 30, and a protective casing (not shown) arranged externally with respect to the heating device 80 and the housing 30. The heating device 80 is suitable for heating each of the capsules 16 inserted in the housing 30, independently, so as to bring the contents of the capsule 16 to a desired temperature.

Advantageously, the heating device 80 is also suitable for heating the mold 68 and/or the preform 54.

The heating device 80 particularly comprises a plurality of sources 82 of infrared radiation, arranged to emit each of the infrared rays to one of the capsules 16, with an individually modulated power.

The sources 82 are arranged to emit through the access openings to the capsules 16 of the casing 40, or between the bars of the structure 28 depending on the case.

The rays have frequencies in the near infrared range, for example between 800 nm and 3 pm.

The rays are suitable for passing through the side wall 18 of the capsules, which is made of a material transparent to near infrared rays, and for directly heating the contents of the capsules 16 individually.

The power emitted by each source 82 is determined so as to bring the contents of the capsule 16 to which the source 82 emits to a predetermined desired temperature.

Advantageously, the device 10 further comprises a checking system 90 of the capsules 16 fitted in the housing 30. The checking system 90 is suitable for determining whether the capsules 16 fitted in the housing 30 are suitable for contributing to the preparation of the composition 12, that is to say whether the capsules 16 correspond to a formula of the composition 12 to be prepared, and/or whether each of the capsules 16 is suitable for use for preparing the composition 12.

The checking system 90 comprises for example a plurality of spectrometry cells 92, aligned parallel with the longitudinal axis X-X’ and arranged facing the capsules 16, intended to analyze the contents of each capsule 16 by spectrometry, using frequencies belonging to a spectrum comprising the infrared, visible, and/or near ultraviolet range.

Each cell 92 comprises for example at least one diode 93 suitable for emitting rays toward the capsules 16, and at least one optical sensor 95 suitable for collecting the rays having interacted with the capsules 16 and for measuring a spectrum in a frequency band.

The checking system 90 further comprises a processing module 97, particularly comprising a processor and a memory.

The processing module 97 is suitable for controlling each cell 92, analyzing the measurement results of the sensors 95 and reconstructing the signature of the capsule 16.

Each diode 93 is suitable for emitting rays having a frequency included in a specific band of the diode 93. For example, each cell 92 comprises a red diode 93, a green diode 93, a blue diode 93, and two diodes 93 emitting in the ultraviolet range.

The red, green and blue diodes 93 are suitable for emitting rays having a frequency included in the band between 600 nm and 700 nm, between 500 nm and 550 nm and between 470 nm and 490 nm, respectively.

The diodes 93 emitting in the ultraviolet range are suitable for emitting rays having a frequency included in the ultraviolet spectrum, that is to say for example between 100 nm and 400 nm. Advantageously, the two UV diodes emit rays wherein the frequencies are in two distinct bands of the ultraviolet spectrum.

Each sensor 95 is suitable for measuring a spectrum in a frequency band, that is to say a profile of the intensities of the rays collected according to the frequency thereof.

Each cell 92 comprises for example a measurement sensor 85 in the visible spectrum, such as a phototransistor, and a measurement sensor 95 in the ultraviolet spectrum.

The cell 92 is thus suitable for measuring a signature of the capsule 16 facing the cell 92, under the control of the processing module 97.

The signature of the capsule 16 is a frequency spectrum of the rays collected by the sensors 95, and is dependent on the frequencies of rays absorbed and transmitted by the capsule 16, that is to say by the side wall 18 and by the contents.

The signature of each capsule 16 is measured by emitting toward the capsule 16 rays having predetermined respective intensities and frequencies, by means of the diodes 93, by measuring by means of the sensors 95 the spectra of the rays collected by the capsules 16, and reconstructing the signature of the capsule 16 by means of the processing module 97.

The signature of each capsule 16 is characteristic of the contents of the capsule 16 and of the outer wall 18, and makes it possible to identify the capsule 16 from a database stored in the memory, and containing the signature templates of the different capsules 16 suitable for use with the device 10.

The processing module 97 is suitable for comparing the signature of each capsule 16 to templates stored in the database to determine the nature and contents of the capsules 16 placed in the housing 30. The processing module 97 is also suitable for comparing the capsules 16 in the housing 30 to cosmetic composition formulas stored in the database and determining whether there is a match. Finally, the processing module 97 is suitable for allowing the preparation of the composition 12 if there is a match, and for preventing it otherwise.

For example, the processing module 97 is connected to an activator 94 of the piston 36, so as to allow the movement of the piston 30 only if it determines a match between the capsules 16 placed in the housing 30 and a formula stored in the memory. In particular, the processing module 97 is suitable for allowing an electrical contact between an external energy source and the actuator 94 only if the capsules 16 are determined to be suitable for contributing to the formation of the composition 12.

Advantageously, the checking system 90 is also suitable for determining the lengths of the capsules 16 arranged in the housing 30. Indeed, if a plurality of adjacent cells 92 measure an identical signature, the processing module 97 determines that the same capsule 16 extends facing the cells 92 in question and can thus determine the length of the capsule 16 among the possible dimensions.

Advantageously, the checking system 90 is further suitable for determining whether one of the capsules 16 arranged in the housing 30 is unfit for use.

For example, the checking system 90 is suitable for measuring the presence of a marker previously placed on the outer wall 18 of the capsule 16, and enabling the activation of the piston 36 only if each of the capsules 16 has the marker.

The marker is for example a substance placed on the outer wall 18 and having a characteristic signature in the frequency bands of the diodes and the sensors. The marker is degraded after a certain time or above a certain temperature and no longer has the same characteristic signature. The marker is for example vitamin C, or avobenzone.

This alternative embodiment makes it possible to check the validity of the capsules 16, and prevent the filling and reuse thereof, since the marker is degraded after the first use of the capsule 16. According to an alternative embodiment not shown, the checking system 90 comprises at least one infrared diode 93 and at least one infrared sensor 95 arranged on an opposite side of the housing 30, to measure the spectrum of the infrared rays traversing the capsule 16.

According to an alternative embodiment not shown, the checking system 90 comprises a digital camera intended to analyze the external appearance of the capsules 16, and particularly that of the side wall 18, so as to determine the nature of the contents of each of the capsules 16, by means of an image analysis performed by the processing module 97, substituting the cells 92.

According to an alternative embodiment not shown, the first capsules 16 do not include fins 24. The device 10 includes in this case at least one independent removable insert for reducing the diameter of the housing 30. The insert is for example in the form of a substantially cylindrical sleeve and has an outer diameter substantially equal to the second outer diameter d2. The insert defines a substantially cylindrical secondary housing for receiving the first capsules 16 having an inner diameter substantially equal to the first outer diameter di .

The secondary housing opens at two opposite ends of the insert, so as to enable the circulation of the first head 28 and of the contents of the first capsules 16 toward the outlet nozzle 34.

Alternatively, the insert is composed of a plurality of bars substantially parallel with one another, assembled with two end structures by the respective ends thereof, and defining the secondary housing therebetween.

Advantageously, the insert has a sufficient length to receive a plurality of first capsules 16 positioned end to end in the secondary housing.

Advantageously, the insert comprises two parts, for example connected by a hinge, so as to facilitate the positioning of the capsules 16.

A process for preparing the composition 12 using the preparation device 10 will now be described.

During a preliminary step, a set of capsules 16, each containing constituents of the composition 12, is selected according to the nature of the composition 12 sought.

During a first step, the capsules 16 are arranged in the housing 30. The capsules 16 are arranged aligned along the longitudinal axial X-X’, in a coaxial manner, according to an increasing order of diameter toward the outlet nozzle 32.

Piston heads corresponding to the different diameters of the capsules 16 are also inserted into the housing 30, arranged between the groups of capsules 16 having the same inner diameter. For example, the set of capsules 16 comprises first capsules 16 and second capsules 16 as described above. A first head 58 having an outer diameter equal to the first inner diameter d’i is positioned upstream from the first capsules 16, relative to the direction of travel of the piston 36. A second head 60 having an outer diameter equal to the second inner diameter d is positioned before the second capsules16, relative to the direct of travel of the piston 36.

The block 46 is then moved in the housing 30, along the longitudinal axis X-X’, until contact of the first capsules 16, so as to position the capsules 16 pressing against one another and against the outlet nozzle 32.

The side walls 18 of the first capsules 16 then form the first circulation conduit and the side walls of the second capsules 16 then form the second circulation conduit.

The process then comprises a step of positioning a receptacle or a preform 54, connected to the outlet nozzle 32. The preform 54 or the receptacle is fluidically connected, tightly, to the opening 50 of the outlet nozzle 32, so as to receive the contents of the capsules 16 flowing through the outlet nozzle 32.

The preform 54 or the receptacle is fastened by the fastening means 52 to the outlet nozzle 32.

The preform 54 or the receptacle is particularly positioned without introducing into the housing air from outside the device 10.

In the case where the receptacle is positioned, it is particularly empty, such as a folded bag, or contains for example a neutral gas.

In the case where the preform 54 is positioned, the process comprises a step of heating the preform 54, and optionally the mold 68, so as to allow the deformation of the preform 54. The preform 54 is for example heated up to a softening temperature of the part 71 .

The process then optionally comprises a step of heating each capsule 16 individually by means of the device for heating the capsules 16, during which the contents of each capsule 16 are heated to a predetermined temperature, for example to fluidify same and facilitate the flow and miscibility thereof.

The process advantageously comprises a step of determining the property of capsules 16 of taking part in the preparation of the composition 12. The checking device 90 measures the signature of each of the capsules 16 and determines the nature and contents of each of the capsules 16, as well as the presence of the non-degraded marker on the outer wall 18 of the capsules 16.

If the capsules 16 arranged in the housing 30 match a valid formula of the composition 12 saved in the memory, and if the non-degraded marker is present on the capsules 16, the checking device 90 allows the movement of the piston 36. Otherwise, the checking device 90 signals an error.

The process then comprises a step of moving the piston 36 along the longitudinal axis X-X’, toward the outlet nozzle 32, through the housing 30 and through the capsules 16.

The step of moving the piston 36 comprises a first substep during which the rods 56 moves in contact with the first head 58, followed by successive substeps of moving the piston 36 through each first capsule 16, stretching the seals 22 of each capsule 16 to the rupture threshold thereof, and conveying the contents of the first capsules 16 toward the first end 34.

The seals 22 are stretched successively about the piston 36 and line the walls of the first circulation conduit. Each seal 22 tears once the rupture threshold has been reached, so as to enable the flow of the contents from the capsules 16. The seal 22 tears cleanly, without forming debris in the first circulation conduit, and retracts upstream from the piston 36.

The contents of the first capsules 16 flow particularly through the conduit 62 defined by the second head 60 and are mixed in the conduit 62.

The step of moving the piston 36 then comprises a substep of moving the piston 36 in contact with the second head 60, pressing the piston 36 on the second head 60, and assembling the second head 60 on the first head 58 particularly by snap-locking.

The step of moving the piston 36 then comprises substeps of moving the piston 36 through each second capsule 16 and stretching each seal 22 of the second capsules 16, and conveying the contents of the capsules 16 toward the first end 34.

The process then comprises a step of extruding the contents of the capsules 16 through the opening 50 of the outlet nozzle 32, into the receptacle or against the preform 54.

Advantageously, during the movement of the piston 36 and the extrusion of the contents of the capsules 16, the piston 36, the side walls 18 of the capsules 16, the outlet nozzle 32 and the receptacle or the preform 54 engage to form a circulation channel fluidically isolated from the outside. The side walls 18 of the capsules 16 and the head(s) 58, 60 are in tight contact, making it possible to prevent an entry of air from outside the device 10, which could contaminate the composition 12.

Optionally, the process comprises a step of deforming the preform 54 so as to form the receptacle. The contents of the capsules 16 flow against the inner surface 72 of the preform 54 and exert thereon a pressure which deforms the preform 54. The preform 54 is deformed irreversibly and becomes the receptacle receiving the composition 12, particularly in a mold 68. The process finally comprises a step of engaging at least one of the heads of the piston 36 in the receptacle, so as to form a plug of the receptacle. The plug is particularly snap-locked in the opening of the receptacle.

For example, the first head 58 and the second head 60 are assembled with one another and form a plug of the receptacle.

The process comprises steps of detaching the receptacle from the outlet nozzle 32 and removing the perforated capsules 16 from the housing 30.

Optionally, the process further comprises a step of perforating the plug and positioning a member for dispensing the composition 12 on the plug.

Advantageously, the process comprises steps of positioning a new receptacle or a new preform 54, as well as introducing in the housing 30, removably, a new plurality of capsules 16, as described above, each capsule 16 containing at least one constituent of a new composition 12.

Alternatively, the product to be mixed is prepared based on another preparation device.

As indicated hereinabove, this product is not necessarily a cosmetic product.