| US6306235B1 | 2001-10-23 | |||
| KR19990083677A | 1999-12-06 | |||
| KR20020021661A | 2002-03-21 | |||
| KR200270558Y1 | 2002-04-03 |
| 1. | A method for manufacturing a multiprofile useful for the production of a spiral synthetic resin pipe, comprising the steps of : engaging a die having double extrusion holes with ends of extruders; feeding a mixture of polyethylene, chaff, and wood flour into a first extruder for manufacturing a profile body and melting the mixture; feeding only polyethylene into a second extruder for coating the profile body and melting the polyethylene; extruding the mixture and polyethylene through the die to manufacture a double profile in which the profile body made of polyethylene, chaff, and wood flour is coated with polyethylene alone, said doubleprofile having two profiles surrounded by partitions in a structure such that the partition between the profiles is cut to connect the profiles; defining a shape of the profile at a low temperature under vacuum ; cooling the doubleprofile; and winding the doubleprofile on a drum. |
| 2. | A method for manufacturing a multiprofile useful for the production of a spiral synthetic resin pipe, comprising the steps of : engaging a die having double extrusion holes with ends of extruders ; feeding a mixture of polyethylene, chaff, and wood flour into a first extruder for manufacturing a profile body and melting the mixture; feeding only polyethylene into a second extruder for coating the profile body and melting the polyethylene; extruding the mixture and polyethylene through the die to manufacture a double profile in which the profile body made of polyethylene, chaff, and wood flour is coated with polyethylene alone, said doubleprofile comprising the profile body and a coated portion which are different from each other in terms of thermal conductivity and having two profiles surrounded by partitions in a structure such that the partition between the profiles is grooved at an upper and a lower position and a polyethylene resin is coated on the partition; defining a shape of the profile at a low temperature under vacuum; cooling the doubleprofile; and winding the doubleprofile on a drum. |
| 3. | The method according to claim 2, wherein the doubleprofile has an interior and an exterior portion composed of two different kinds of resin, having different thermal conductivities, and the interior portion is thicker than the exterior portion such that interior and exterior portion of the profile are uniformly cooled. |
| 4. | A multiprofile for producing a spiral synthetic resin pipe, having profiles surrounded by partitions, said partition having penetrating holes communicating profiles to each other. |
| 5. | The multiprofile according to claim 4, wherein each of doubleprofiles constituting the multiprofile has two profiles surrounded by the partitions in a structure such that the partition between the profiles is cut to connect the profiles. |
| 6. | The multiprofile according to claim 4, wherein the partition between profiles in the doubleprofile is grooved at an upper and a lower position by a die with two extrusion holes positioned at an end of the extruder in a structure such that the partition between profiles connects the profiles at a middle position, and grooves are coated with a polyethylene resin. |
| 7. | A spiral synthetic resin pipe, produced by spirally winding a multiprofile comprising profiles surrounded by partitions with penetrating holes communicating profiles to each other, said multiprofile being connected to other multiprofile by use of a resin. |
PRIOR ART Conventionally, profiles used to produce a spiral synthetic resin pipe are manufactured by shaping profiles into 0', spirally winding them on a drum of an extruder, filling a resin between profiles to connect profiles to each other, and cooling the connected profiles.
However, the conventional profile is disadvantageous in that production time of the spiral synthetic resin pipe is too long because width of the profile is narrow and the regular quadrilateral profile should be continuously and spirally wound, and production cost is high because high-priced resin is used for connecting profiles to each other, thereby the conventional profile is insufficiently competitive in terms of productivity.
DISCLOSURE OF THE INVENTION Therefore, it is an object of the present invention to avoid the above disadvantages, and to provide a multi-profile consisting of the double-profile unit alone or a plurality of double-profile units in combination, useful for the production of a spiral synthetic resin pipe. Each double-profile unit has two rectangular profiles surrounded by partitions in a structure such that the partition between the profiles is cut to connect the profiles or is grooved at an upper and a lower position, and in the case of the formation of grooves, the grooves are filled with a polyethylene resin, thereby the multi-profile is prevented from being shrunk or bent when it is cooled.
BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: Fig. 1 schematically illustrates production of profiles according to the present invention; Fig. 2 illustrates schematic side elevation views of devices for producing profiles according to the present invention; Fig. 3 is a front view of a die for extruding profiles according to the present invention; Fig. 4 is a partial perspective view of a multi-profile according to the present invention; Fig. 5 is an enlarged transverse sectional view of a detailed portion of the multi-profile according to the present invention; Fig. 6 is a partial cutaway perspective view of the multi-profile according to
a first embodiment of the present invention; Fig. 7 is an enlarged transverse sectional view of a detailed portion of the multi-profile according to the first embodiment of the present invention; Fig. 8 illustrates schematic side elevation views of devices for producing profiles according to the first embodiment of the present invention; Fig. 9 is a front view of a die for extruding profiles according to the first embodiment of the present invention; and Fig. 10 is an enlarged transverse sectional view of a detailed portion of the multi-profile according to a second embodiment of the present invention.
BEST MODES FOR CARRYING OUT THE INVENTION The present invention provides a method for manufacturing a multi-profile useful for the production of a spiral synthetic resin pipe, comprising the steps of engaging a die having''-shaped extrusion holes with ends of extruders ; feeding a mixture of polyethylene, chaff, and wood flour into a first extruder for manufacturing a profile body, and melting the mixture; feeding only polyethylene into a second extruder for coating the profile body, and melting the polyethylene; extruding the mixture and polyethylene through the die to manufacture a double- profile in which the profile body made of polyethylene, chaff, and wood flour is coated with polyethylene alone; defining a shape of the profile at a low temperature under vacuum; cooling the double-profile; spirally winding the double-profile on a drum; connecting the double-profile with other double-profile by use of a resin to manufacture the multi-profile; cooling the multi-profile; and cutting the resulting multi-profile. The double-profile has two profiles surrounded by partitions in a structure such that the partition between the profiles is cut to connect the profiles.
According to a first embodiment of the present invention, provided is a method for manufacturing a multi-profile useful for the production of a spiral synthetic resin pipe, comprising the steps of engaging a die having''-shaped
extrusion holes with ends of extruders; feeding a mixture of polyethylene, chaff, and wood flour into a first extruder for manufacturing a profile body, and melting the mixture; feeding only polyethylene into a second extruder for coating the profile body, and melting the polyethylene; extruding the mixture and polyethylene through the die to manufacture a double-profile in which the profile body made of polyethylene, chaff, and wood flour is coated with polyethylene alone; defining a shape of the profile at a low temperature under vacuum; cooling the double-profile; spirally winding the double-profile on a drum; connecting the double-profile with other double-profile by use of a resin to manufacture the multi-profile; cooling the multi-profile; and cutting the resulting multi-profile. The double-profile comprises the profile body and a coated portion which are different from each other in terms of a thermal conductivity and has two profiles surrounded by partitions in a structure such that the partition between the profiles is grooved at an upper and a lower position and a polyethylene resin is coated on the partition.
The rectangular double-profile 4 manufactured by the die 3 with two extrusion holes 2 positioned at an end of the extruder 1 has two profiles surrounded by the partition in a structure such that the partition between profiles is cut to connect the profiles. As represented in the accompanying drawings of the present invention, 7 is an extruder for manufacturing a profile body, 8 is an extruder for coating the profile body, 9 is a vacuum cooling device, and 10 is a cooling device.
Alternatively, the rectangular double-profile 4'manufactured by the die 3' with two extrusion holes 2'positioned at an end of the extruder 1 has two profiles surrounded by the partition in a structure such that the partition between profiles is grooved at an upper and a lower position but connects the profiles at the mid position, and the grooves are filled with polyethylene resin.
Meanwhile, the multi-profile comprises a plurality of profiles surrounded by partitions which have penetrating holes communicating profiles to each other.
A more detailed description will be given of a method for manufacturing a double-profile and a multi-profile, below.
Resin for manufacturing a profile body (a mixture of polyethylene (PE), chaff, and wood flour) is supplied to an extruder for manufacturing the profile body, and polyethylene resin alone is supplied to an extruder for coating the profile body, while the mixture and polyethylene resin being melted.
The die with''-shaped extrusion holes is engaged to ends of the extruders, and the mixture of polyethylene, chaff, and wood flour, i. e. a first resin, is extruded through the die. The extruded mixture, i. e. the double-profile, has a structure such that the partition between profiles is cut at a middle position to connect the profiles to each other. Simultaneously, the polyethylene resin is extruded through a second extruder in conjunction with the mixture constituting the profile body to coat the profile body. The extruded double-profile is directly transported to the vacuum cooling device to maintain a predetermined shape, then the resulting double-profile is passed through the cooling device in which water is sprayed to the profile and the profile is cooled, and the double-profile is spirally wound on a drum useful to manufacture the spiral pipe.
When the double-profile is wound on the drum, the polyethylene resin is supplied to a junction of the double-profiles through an extruder for manufacturing the spiral pipe, pressed by a roller, and cooled, thereby the spiral pipe is produced.
Meanwhile, when manufacturing the double-or multi-profile according to the embodiment of the present invention, the presence of a blanket of a polyethylene resin filling the grooves 6 formed on the upper and the lower position of the partition between profiles allows the interior of the profiles to be cooled at the same rate as that of the exterior owing to the high cooling rate of the polyethylene resin, preventing the profile from being bent.
INDUSTRIAL APPLICABILITY As described above, the present invention provides a multi-profile consisting of the double-profile unit alone or a plurality of double-profile units in
combination, useful for the production of a spiral synthetic resin pipe, and a method for producing the same. Each double-profile unit has two compartments surrounded by partitions in a structure such that the partition between the compartments is cut to connect the compartments or is grooved at an upper and a lower position. In the case of the formation of grooves, they are filled with a polyethylene resin. The multi-profile of the present invention is advantageous in that the multi-profile is easily manufactured because its structure is simple and is not shrunk or bent when it is cooled because the partition between the profiles is cut at a middle position of the partition. Other advantages of the multi-profile of the present invention are that a large area of the multi-profile is composed of the polyethylene resin, and so a spiral synthetic resin pipe is produced in large quantities in a short time because the partition between the profiles is grooved at an upper and a lower position and the grooves are filled with a polyethylene resin, and production cost is reduced because resin used to connect profiles to each other is saved by combining profiles to manufacture the double-and the multi-profile.
The present invention has been described in an illustrative manner, and it is to be understood that the terminology used is intended to be in the nature of description rather than of limitation. Many modifications and variations of the present invention are possible in light of the above teachings. Therefore, it is to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described.