JP2000343614A - Long-sized extrusion molded product and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-weight long-sized extrusion molded product having a bent synthetic resin as a core material and a method for manufacturing the molded product capable of easily manufacturing the molded product. SOLUTION: The method for manufacturing a long-sized extrusion molded product comprises a connecting step of superposing a plurality of flat plate resin tapes 10 of a sectional fat plate shape and forming a connecting portion 2 for connecting the tapes 10 to each other at least one position at superposed portions, a core material forming step of bending at least one tape 10 with the portion 10 as a flexing point A to form a core material 11, and an extrusion step of covering at least portion of the periphery of the material 11 with a synthetic resin material for a body 10 and integrally forming the material 11 with the body 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a long extruded product and a method for producing the same.

[0002]

2. Description of the Related Art For example, joints between exterior wall panels for houses,
A long extruded product such as a gasket for closing the window glass is mounted between the window glass and the body of the automobile. For example, as shown in FIG. 14, a gasket 9 for a house is disposed at a joint 80 between two outer wall panels 8,
It prevents rainwater from entering the joint 80.

As shown in FIG. 13, this conventional gasket 9 is made of a metal core material 9 bent into a substantially T-shaped cross section.
1 and a main body 9 made of synthetic resin such as rubber for covering the core material 91.
2 is comprised. Further, a lip portion 921 is provided on the main body portion 92, so that the easiness of mounting is secured and the sealing property is improved. This gasket 9
A color material 922 for improving the design is arranged at the upper end of the.

[0004]

[Problems to be solved] By the way, the gasket 9
Usually, it is often used after being cut to an optimum length by site adjustment. However, it is not always easy to cut the gasket 9 because the core material 91 is made of metal. Further, the gasket 9 has a problem that the core material 91 is made of metal, so that the weight is heavy and the handling is not easy.

The core 91 is made of metal, while the main body 92 is made of synthetic resin such as rubber, and both have greatly different thermal expansion characteristics. Therefore, when the gasket 9 is used in an environment where the temperature changes greatly, the core material 91 and the main body 9 may be used.
In some cases, the difference in the amount of expansion and contraction between the two causes a problem that the adhesion between the two is reduced and the durability is affected.

The conventional gasket 9 is shown in FIG.
As shown in (1), one metal plate is bent to form the core material 91. For this reason, a superposed portion 911 and a non-superimposed portion 912 are formed and are not symmetrical. Further, the thickness of the overlapped portion 911 is increased, so that the degree of freedom of the shape of the core material 91 is limited.

In order to solve these problems, the core material 9
There is an idea that a lightweight synthetic resin is used as the material 1 (for example, JP-A-61-225036). However, in the related art, it is not always easy to manufacture a lightweight long extruded product having a core made of a synthetic resin bent into a shape such as a substantially T-shaped cross section, and a processing method is not necessarily established. Absent.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object a light-weight long extruded product using a bent synthetic resin as a core material and a manufacturing method capable of easily manufacturing the same. It is something to offer.

[0009]

According to the first aspect of the present invention, there is provided a method for manufacturing a long extruded product comprising a synthetic resin core material and a synthetic resin body covering the core material. Joining a plurality of flat resin tapes having different shapes, and forming at least one joining portion for joining the flat resin tapes to each other at the overlapped portion; A core material forming step of forming a core material by applying a bending process to at least a part of the core material; And an extrusion step of integrally molding the main body portion.

The most remarkable point in the present invention is that a plurality of flat resin tapes are used as the core material, and the above-mentioned bonding process is performed thereon, and then the core material forming process is performed.

As the flat resin tape, for example, a thermoplastic resin can be used. Specifically, for example,
Various materials such as polyethylene, polypropylene, polystyrene, polyvinyl chloride, polymethyl methacrylate, polyamide, polyester, polycarbonate, polyacetal, and cellulose acetate can be used.

As the flat resin tape, other than thermoplastic resin, phenol resin, vinyl ester resin, unsaturated polyester resin, epoxy resin, polyurethane resin and the like can be used.

As the flat resin tape, a tape having a flat cross section is used. The thickness and width dimensions can be appropriately selected according to the size of the long extruded product to be obtained. In addition, it is also possible to divert a generally used resin tape for packing to the flat resin tape.

In the joining step, first, the plurality of flat resin tapes are overlapped. As the flat resin tape, a plurality of the same size resin tapes or different size resin tapes may be used in combination. Also,
Various methods can be used for the overlapping according to the desired core material shape.

In the joining step, at least one joining portion for joining the flat resin tapes to each other is formed at a portion where the flat resin tapes overlap each other. The joining portion may be provided only at a portion which becomes a bending point in a later core material forming step, or may be provided at a plurality of portions or on the entire surface of a portion which remains superimposed without being separated.

In the core material forming step, a bending process is applied to the flat resin tape with the above-mentioned joints as bending points. Examples of the method of performing the bending include a method of forming a roller using a forming roller and a method of using a sizing device described later.

The extruding step is carried out by a conventionally known extruding method of covering the core with a synthetic resin material for the main body and integrally molding the core and the main body. be able to. In this case, it is not necessary to cover the entire circumference of the core material. This is because there is no need to consider corrosion of the core material.

As the synthetic resin material for the main body, a thermoplastic resin or a thermosetting resin can be used. Examples of the thermoplastic resin in this case include polyethylene, polypropylene, polyvinyl chloride, polystyrene, and polyester. Examples of the thermosetting resin include rubber materials such as silicone rubber, EPDM, styrene / butadiene rubber, and chloroprene; phenol resins; and unsaturated polyester resins.

Next, the operation of the present invention will be described. In the present invention, the flat resin tape is used as the core material. And for this flat resin tape,
A core material is formed by performing bending. for that reason,
The obtained long extruded product can be finished lighter than a conventional long extruded product using metal as a core material. In addition, since the core of the long extruded product is a synthetic resin, it can be easily cut at an arbitrary position.
Further, the difference in the coefficient of thermal expansion between the core material and the main body can be significantly reduced as compared with the related art. Therefore, the obtained long extruded product is very easy to handle.

In the present invention, a core material is formed by bending a plurality of flat resin tapes from the above-mentioned bending points. Therefore, the degree of freedom of the shape of the obtained core material can be increased by appropriately selecting the size of the flat resin tape and the formation position of the joining portion that becomes the bending point. Therefore, it is possible to easily obtain a core material having a desired shape, such as a core material having a symmetrical shape or a core material in which a desired portion is reinforced by partially overlapping a flat resin tape. In addition, since the bending process is performed using the bonding portion as a bending point, the bending process can be easily and accurately performed without a problem such as a shift of the bending point.

Therefore, according to the present invention, it is possible to easily manufacture a lightweight long extruded product using a bent synthetic resin as a core material.

Next, a second aspect of the present invention is a method of manufacturing a long extruded product comprising a synthetic resin core and a synthetic resin main body covering the core. Shape 1
A step of bending and flattening the two flat resin tapes and forming at least one joint at which the flat resin tapes are joined to each other at the overlapped portion; A core material forming step of forming a core material by bending at least a part of the tape, and covering the at least a part of the periphery of the formed core material with the synthetic resin material for the main body; And an extruding step of integrally molding the main body and the main body.

In this manufacturing method, a single flat resin tape is used in place of the above-described plurality of flat resin tapes, and the above-mentioned overlapping portions are formed by bending the flat resin tape. The bending of the single flat resin tape can be performed, for example, by a method of first bending the resin tape into a substantially V shape using a pair of upper and lower forming rollers, and further pressing the pair of rollers from the left and right.

According to the present manufacturing method, the flat resin tape is
Since the core material can be manufactured using only the sheets, the structure of the material supply unit in the manufacturing apparatus can be simplified, and the manufacturing can be rationalized. In other respects, the same operation and effect as the first aspect of the invention can be obtained.

Next, a third aspect of the present invention is a method for producing a long extruded product comprising a synthetic resin core material and a synthetic resin body covering the core material. A plurality of flat resin tapes having different shapes are overlapped in advance, or one flat resin tape having a flat cross section is folded in advance and overlapped, and the flat resin tapes are joined to each other at the overlapped portion. A core material forming step of forming a core material by bending at least a part of the flat resin tape using the material having at least one joint portion as a bending point; and forming the core material. Manufacturing an elongated extruded product, wherein an extruding step of coating the synthetic resin material for the main body part on at least a part of the periphery thereof and integrally molding the core material and the main body part is performed. In the way .

In the present invention, as the core material, the plurality of flat resin tapes may be overlapped in advance,
Alternatively, the core material forming step is performed by using a material in which one flat resin tape is bent in advance and overlapped and has at least one joint portion.

Also in this case, similarly to the above, it is possible to easily obtain an excellent long extruded product which is lightweight, easy to cut, has a small difference in thermal expansion from the main body, and is easy to handle. Further, the degree of freedom of the shape of the core material of the long extruded product can be increased. Therefore, a long extruded product having a core material having a desired shape can be easily obtained.

Next, as in the fourth aspect of the present invention, it is preferable that the core material has pieces extending in at least three different directions around the bending point. That is, it is preferable that the core material has a shape having three or more pieces, such as a T-shape and a cross shape. In this case, the degree of freedom of the shape of the core material in the above manufacturing method can be effectively exhibited.

Further, as in the fifth aspect of the present invention, it is preferable that the formation of the joint is performed by sewing. In this case, by using a so-called sewing machine, the joining step can be easily performed. As a joining method other than the sewing, there are various conventional methods, for example, a method of bonding with an adhesive and a method of welding.

Further, as in the invention of claim 6, the core material forming step is performed by using a sizing device, and the plurality of flat resin tapes superimposed in a flat plate shape are gradually provided inside the sizing device. It is preferable to provide a forming passage for changing the shape to a desired shape, and to pass the plurality of flat resin tapes through the forming passage.

In this case, the core material forming step can be easily performed without providing a large-scale core material processing device as in the case where the conventional core material is made of metal. Further, core materials of various shapes can be easily formed only by modifying the forming passage of the sizing device.

According to a seventh aspect of the present invention, in the core material forming step, a separating roller is inserted into one end of the superimposed flat-plate resin tape having the joint portion and separated from each other, and then separated. A pair of guide rollers having rotating shafts arranged in parallel with each other, and a pressing roller having a rotating shaft arranged in a direction perpendicular to the rotating shaft of the guide rollers and facing the end surfaces of the pair of guide rollers, The flattened portion of the flat resin tape may be pinched by the guide roller, and the separated portion may be pinched by the end face of the guide roller and the pressing roller to bend the flat resin tape. Also in this case, the core material can be easily bent.

Next, an eighth aspect of the present invention is a long extruded product comprising a synthetic resin core material and a synthetic resin body covering the core material, wherein the core material has a cross-section. A plurality of flat-plate resin tapes are superimposed, or one flat-plate resin tape having a flat cross-section is bent and overlapped, and the joined portion where the flat-plate resin tapes are joined to each other at the overlapped portion is formed. A long extruded product having at least one portion, wherein at least one of the flat resin tapes is bent using the joint as a bending point.

The most remarkable point in the present invention is that the core material is formed of a flat resin tape and is subjected to a bending process with the above-mentioned joint portion as a bending point. In this case, the operation of bending the flat resin tape can be performed very easily and accurately in the process of manufacturing the long extruded product. Therefore, the long extruded product is inexpensive and has excellent dimensional accuracy. In addition, as described above, since the core material is a synthetic resin, it is possible to obtain the effects of being lightweight, easy to cut, having a small difference in thermal expansion with the main body, and being easy to handle.

[0035]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 A long extruded product according to an embodiment of the present invention and a method for producing the same will be described with reference to FIGS. A long extruded product 1 of this example is a gasket for a house, and is made of a synthetic resin core 11 having a substantially T-shaped cross section, and a core 11 made of a synthetic resin.
And a main body 19 made of rubber. The core material 11
Has at least one joint 2 where two flat resin tapes 10 each having a flat cross section are superimposed and the respective flat resin tapes 10 are joined to each other at the superposed portion. 2 is a bending point A, and at least one flat resin tape 10 is bent.

The gasket (long extruded product) 1 was manufactured as follows. That is, as shown in FIG. 3 (a), first, two flat resin tapes 10 having a flat cross section were superposed. Next, as shown in FIG. 3 (b), a joining step was performed by forming a plurality of joining portions 2 for joining the flat resin tapes 10 to each other in the overlapped portion.

Next, as shown in FIG. 3C, a core material forming step of forming a core material 11 by bending one of the two flat resin tapes 10 with one of the joints 2 as a bending point A. Was done. Next, an extrusion process was performed in which at least a part of the periphery of the molded core material 11 was covered with a rubber material for the main body 19 and the core material 11 and the main body 19 were integrally formed. .

In carrying out this manufacturing method, a manufacturing apparatus 5 as shown in FIG. 2 was used. As shown in the figure, the manufacturing apparatus 5 has two uncoilers 51, a tape joining machine 52, a core material forming machine 53, an extruder 54, a vulcanizing tank 55, a cooling tank 56, a take-off machine 57, and a cutting machine 58. ing.

The tape joining machine 52 incorporates a so-called sewing machine, and is configured to form the joining portion 2 by sewing. In this example, as shown in FIG. 3B, four sewing machines are provided side by side so as to sew four places along the longitudinal direction of the flat resin tape 10.

The core forming machine 53 comprises a sizing device as shown in FIG. This sizing device 53
Is provided therein with a molding passage 530 for gradually changing the plurality of flat resin tapes stacked in a flat shape into a desired shape. Then, the core material forming step is performed by passing the plurality of flat resin tapes 10 through the forming passage 530.

The extruder 54 comprises an extruder main body 541 and a head portion 542 provided at the tip of the extruder as in the prior art.
The head member 542 has a core material 11 disposed therein.
And a base (not shown) provided at the tip. Other vulcanizing tank 5
5, the cooling tank 56, the take-off machine 57, and the cutting machine 58 are the same as the conventional manufacturing apparatus.

Then, using the manufacturing apparatus 5, the two flat resin tapes 10 wound in a coil shape are rewound from the two uncoilers 51, respectively, and inserted into the tape joining machine 52. In the tape joining machine 52, as described above, four portions of the flat resin tape 10 are sewn to form the joining portion 2. Thereby, the above-mentioned joining step is performed.

Next, the overlapped portions 2
Is sent to a core material forming machine (sizing device) 53. This sizing device 53
Has a forming passage 530 provided so as to gradually change from a flat plate shape to a desired T-shape as described above.
For this reason, the flat resin tape 10 is
By passing through 30, the bending process is performed with the uppermost joint 2 as a bending point. That is, the flat resin tape 10
5A to 5C, the core material 1 gradually changes from a flat plate shape to a desired T shape, and has a substantially T-shaped cross section.
It becomes 1.

Next, the core material 11 sent out from the sizing device 53 joins the rubber material for the main body in front of the base (not shown) and is coated thereon. Then, the core material 11 and the rubber material 190 are integrally formed in the die, and the gasket 1 has a desired shape. This gasket 1 is then vulcanized in a vulcanization tank 55,
After the cooling process described in the above, it is cut to a desired length by the cutting machine 58. The progress of these series of steps is advanced by the tension generated by the take-off machine 57.

As described above, in the present embodiment, the core material 11 is formed by bending the two flat resin tapes 10 from the bending point A. Therefore, the core member 11 having a symmetrical T-shape can be obtained accurately and easily, and the gasket 1 without any lateral deviation can be obtained.

In this embodiment, the core material forming step is performed using the sizing device 53 described above. Therefore, the core material 11 having a desired shape can be easily formed only by modifying the forming passage 530.

The gasket 1 of this embodiment has a core 11 made of a synthetic resin obtained by molding a flat resin tape 10. Therefore, the gasket 1 can be lighter in weight than a conventional gasket using metal as a core material. In addition, the gasket 1 can be easily cut at an arbitrary position because the core material 11 is a synthetic resin. Furthermore, the difference in the coefficient of thermal expansion between the core 11 and the main body 19 can be significantly reduced as compared with the related art. Therefore, the gasket 1 is very easy to handle.

Embodiment 2 As shown in FIG. 6, this embodiment is an example in which a pair of left and right hot jet devices 523 are provided between the tape joining machine 52 and the core material forming machine 53 in the first embodiment. is there. The hot jet device 523 has a flat nozzle 522 at its tip.
, And is configured to eject hot air from the nozzle 522. In addition, the nozzle 522 is disposed so as to face the joint 2 at the bending point A. In addition, the core material 1
For the flat plate resin tape 10 to be 1, a thermoplastic resin was applied. Others are the same as the first embodiment.

In this embodiment, hot air is blown by the hot jet device 523 to the joining portion 2 of the flat resin tape 10 after the joining process in the tape joining machine 52. Thereby, the joint portion 2 of the flat resin tape 10 made of a thermoplastic resin is softened and the bending process is facilitated. Therefore, the core material forming step after the joining step can be performed very easily and accurately.

Embodiment 3 As shown in FIG. 7, this embodiment is different from the core forming process by the sizing device 53 in Embodiment 1 in that a core forming process using a roller device 6 combining a plurality of rollers is performed. This is an example of implementing. In the manufacturing apparatus 5 of this example, the roller device 6 is provided in front of the extruder 54.

As shown in FIG. 7, the roller device 6 includes a separation roller 61, guide rollers 62, 63, and a pressing roller 6.
4 are combined. Separation roller 61
Are inserted into one end of the overlapped flat resin tapes 10 to separate them from each other, and have a shape as if the bottoms of two cones were joined.

The guide rollers 62 and 63 are a pair of rollers having rotating shafts directed in the vertical direction arranged in parallel with each other.
One guide roller 62 has a cylindrical main body 621. The other guide roller 63 has a large diameter portion 632 having a diameter larger than that of the main body 631 at its lower end.

The guide rollers 62 and 63 are
It is provided in a cantilever structure having a shaft portion 635 only on the lower end side, and the upper end surfaces 628 and 638 are provided in a flat shape.
The pressing roller 64 has a rotating shaft 640 arranged in a direction perpendicular to the rotating shaft of the guide rollers 62 and 63 and the upper end surfaces 628 and 638 of the pair of guide rollers 62 and 63.
It is arranged to face.

The core material forming process using the roller device 6 having such a configuration is performed as follows. First, in the tape joining machine 52, a separating roller 61 is inserted into the upper end of the overlapping flat resin tapes 10 after the joining process is completed, and these are separated into right and left. Next, the flat resin tape 10 is passed between the guide rollers 62 and 63 and the pressing roller 64 arranged as shown in FIGS.

That is, the overlapping portion of the flat resin tape 10 below the bending point A is sandwiched between the pair of guide rollers 62 and 63. At this time, the lower end of the flat resin tape 10 is received by the large diameter portion 632 of the guide roller 63. The bending point A on the flat resin tape 10
The one part separated by the separation roller 61 above is held between the pressing roller 64 and the upper end surfaces 628, 638 of the guide rollers 62, 63.

As a result, as shown in FIG.
The two flat resin tapes 10 move from the overlapping state to the state separated by the separation roller 61, and then,
The three rollers form a T-shaped core material 11. Subsequent manufacturing steps are the same as in the first embodiment.

In this example, as described above, the roller device 6 is used, so that a T-shaped core material can cope with a slight change in size without modifying the equipment. Otherwise, the same operation and effect as those of the first embodiment can be obtained.

Fourth Embodiment As shown in FIG. 9, this embodiment is an example in which a pair of hot jet devices 523 is provided in front of the separation roller 61 in the third embodiment. The hot jet device 523 is the same as that of the second embodiment, and has a flat nozzle 5 at the tip.
22 and is configured to eject hot air from the nozzle 522. In addition, the nozzle 522 is disposed so as to face the joint 2 at the bending point A. Others are the same as the third embodiment.

In this embodiment, the hot jet device 523 blows hot air onto the joining portion 2 of the flat resin tape 10 to soften the joining portion 2 of the flat resin tape 10 made of a thermoplastic resin. it can. Thereby, bending can be facilitated, and the core material forming step can be performed more easily and more accurately. Otherwise, the same operation and effect as those of the third embodiment can be obtained.

Embodiment 5 In this embodiment, as shown in FIG.
After 2, the sizing device 5 having the same configuration as that of the first embodiment
3 were provided. After that, a roller device 71 similar to that of the third embodiment except that the separation roller 61 of the roller device 6 is provided. As shown in FIGS. 10 and 11, three hot jet devices 72 are provided at the bent portion A between the sizing device 53 and the roller device 71. Others are the same as the first embodiment.

In this case, after the flat resin tape 10 is formed into a T-shape by the sizing device 53, the bent portion A is further softened by the hot jet device 72, and then further bent by the roller device 71. It is pressed in a T-shape. Thereby, the accuracy of the shape of the core material 11 can be further improved. Others are the first embodiment.
The same operation and effect as those of Nos. To 4 are obtained.

Embodiment 6 This embodiment is an example in which the shape of the core material 11 of the gasket 1 is changed as shown in FIGS. 12 (a) to 12 (c). That is, FIG.
In the example shown in FIG. 2A, two flat resin tapes 10 are used.
This is an example in which an upper end and a lower end are opened right and left.

In the example shown in FIG. 12B, two small flat resin tapes 18 having a small width are combined with two large flat resin tapes 10, and the bending points A are formed at two places of the upper part and the central part. This is an example in which is provided. In the example shown in FIG. 13 (c), in addition to the two large flat resin tapes 10, two small flat resin tapes 18 having a small width are combined to form bending points A at three locations, that is, an upper portion, a central portion, and a lower portion. This is an example in which the information is provided.

Each of these gaskets can be manufactured by changing the shape of the core material forming step in the first embodiment and the like. Also in this case, the operation and effect shown in the first embodiment can be sufficiently obtained.

[0065]

As described above, according to the present invention, it is possible to provide a lightweight and long extruded product using a bent synthetic resin as a core material and a manufacturing method capable of easily manufacturing the same. .

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a long extruded product according to a first embodiment.

FIG. 2 is an explanatory diagram showing a configuration of a manufacturing apparatus for a long extruded product in the first embodiment.

FIG. 3 is an explanatory view showing a core material forming process in the first embodiment.

FIG. 4 is an explanatory diagram showing a sizing device according to the first embodiment.

FIG. 5 is an explanatory view showing a deformation process of the flat resin tape in the core material forming step in the first embodiment.

6A is a plan view of the hot jet apparatus according to the second embodiment when viewed from above, and FIG. 6B is a front view of the hot jet apparatus viewed from the core material traveling direction.

7A is a plan view of the roller device as viewed from above, FIG. 7B is a side view of the roller device as viewed from the side in the core material traveling direction, and FIG. FIG.

FIG. 8 is an explanatory diagram illustrating a combination state of roller devices according to the second embodiment.

FIG. 9 is a plan view of an installation state of a hot jet device according to a third embodiment, as viewed from above.

FIG. 10 is an explanatory diagram showing an arrangement state of a sizing device, a hot jet device, and a roller device according to a fourth embodiment.

FIG. 11 is a front view of an installation state of a hot jet device according to a fourth embodiment, as viewed from a core material advancing direction.

FIG. 12 is an explanatory diagram showing another example of a long extruded product in Embodiment 5;

FIG. 13 is a sectional view of a long extruded product in a conventional example.

FIG. 14 is an explanatory view showing a state of use of a long extruded product in a conventional example.

[Explanation of symbols]

 1. . . 9. Long extruded product (gasket), . . 10. flat resin tape, . . Core material, 19. . . Main body, 5. . . Manufacturing equipment, A. . . Inflection point,

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B29L 31:30 (72) Inventor Akihiro Mitsudome 4-1-1 Naganecho, Obu City, Aichi Prefecture Tokai Kogyo Co., Ltd. F-term (reference) 4F207 AA45 AD05 AD18 AD21 AG21 AH13 AH23 AH47 KA01 KA20 KB18 KJ08 KL59 4F209 AA45 AD05 AD18 AD21 AG21 AH13 AH23 AH47 NA13 NB01 NG07 PW41 4F213 AA45 AD05 AD18 AD21 AG21 AH47WA06 WA06 WA06 WA06

Claims (8)

[Claims] 1. A method for producing a long extruded product comprising a synthetic resin core material and a synthetic resin main body covering the core material, comprising the steps of: A joining step of forming at least one joining portion for joining the flat resin tapes to each other at the overlapped portion, and bending at least a part of the flat resin tape with the joining portion as a bending point. A core material forming step of forming a core material, and forming at least a part of a periphery of the formed core material with a synthetic resin material for the body portion to integrally form the core material and the body portion. And a method of producing a long extruded product. 2. A method of manufacturing a long extruded product comprising a synthetic resin core material and a synthetic resin body covering the core material, comprising: a single flat resin tape having a flat cross-sectional shape; And forming at least one joining portion for joining the flat resin tapes to each other at the overlapped portion, and at least a part of the flat resin tape using the joining portion as a bending point. A core material forming step of forming a core material by bending the core material, and coating the core material and the main body portion by coating at least a part of the periphery of the formed core material with the synthetic resin material for the main body portion. And an extruding step of integrally molding the same. 3. A method for manufacturing a long extruded product comprising a synthetic resin core material and a synthetic resin main body covering the core material, the method comprising: One sheet of a flat resin tape having a flat cross section is previously bent and overlapped, and at least one joint portion formed by joining the flat resin tapes at the overlapped portion is provided. A core material forming step of forming a core material by forming a core material by bending at least a part of the flat resin tape using the material as a bending point at the joint, and forming the core material at least partially around the formed core material; An extruding step of coating the synthetic resin material for the main body and integrally molding the core and the main body with each other. 4. The method according to claim 1, wherein:
The method for producing a long extruded product, wherein the core material has pieces extending in at least three different directions around the bending point. 5. The method according to claim 1, wherein:
The method of manufacturing a long extruded product, wherein the formation of the joint is performed by sewing. 6. The method according to claim 1, wherein:
The core material forming step is performed using a sizing device, and a forming passage is provided in the sizing device for gradually changing the plurality of flat resin tapes stacked in a flat shape into a desired shape. A method for producing a long extruded product, wherein the method is performed by passing the plurality of flat resin tapes through a molding passage. 7. The method according to claim 1, wherein:
In the core material forming step, a separation roller is inserted into one end of the flattened resin tape having the above-mentioned joint portion and overlapped, and these are separated into right and left. A pressing roller having a rotating shaft arranged in a direction perpendicular to the rotating shaft of the guide roller and facing the end surfaces of the pair of guide rollers is used, and the overlapping portion of the flat resin tape by the guide roller is used. A method for manufacturing a long extruded product, wherein the flat resin tape is bent by holding the separated portion between an end face of a guide roller and the pressing roller. 8. A long extruded product comprising a synthetic resin core material and a synthetic resin body covering the core material, wherein the core material is a plurality of flat resin tapes having a flat cross section. Or one sheet of a flat resin tape having a flat cross section is bent and overlapped, and at least one joint portion where the flat resin tapes are joined to each other at the overlapped portion. A long extruded product characterized in that at least one of the flat resin tapes is subjected to a bending process with the joint as a bending point.