JPH0557820A - Manufacture of weatherstrip - Google Patents

Abstract

PURPOSE:To provide the manufacturing method for a weatherstrip which is bent correspondingly to the curvature of corner sections of windows and doors without unnatural deformation to be general from the use of a jig for bending and has enhanced sealing properties and outer appearance. CONSTITUTION:A rubber extruder 21 and a thermoplastic resin extruder 27 are communicated with a composite extrusion head 25, and a base composed of thermoplastic resin and a seal section composed of flexible rubber material are extrusion molded integrally, and then the seal section is vulcanized through a vulcanizing tank 31, cut by a cutter 39 and heated partially. After that, the base is press deformed together with the seal section by a jig 15 for bending and cooled or left to stand as it is to form a bent section corresponding to the curvature of corners of the doors in the given positions in the manufacturing method of the weatherstrip.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a weather strip which is mounted on an opening edge portion of a window or door of an automobile.

[0002]

2. Description of the Related Art Among weather strips generally used in automobiles, for example, a glass run 10 mounted around a window frame of an elevating window glass as shown in FIG.
Side walls 3 and 5 are integrally erected on both sides of the base 1,
From the upper side of the side walls 3 and 5, a pair of lips 3 is formed.
It has a structure in which a and 5a are slanted inwardly toward the direction of the base 1. The base 1 and the side wall portions 3 and 5 are made of a hard thermoplastic resin, and the lips 3a and 5a are made of a soft thermoplastic resin. And the lip 3a,
The window glass 7 is repeatedly brought into sliding contact with the outside of 5a.

FIG. 16 shows another structural example of the grass run 10a. In this example, the base 1, the side walls 3, 5 and the pair of lips 3a, 5a are made of a soft rubber material 11 as a whole. A core material 13 made of metal and having a substantially U-shaped cross section is embedded in the rubber material 11 at a portion corresponding to the base 1 and the side wall portions 3 and 5, and the base material 1 and the side wall portions are formed by the core material 13. The strength of 3,5 is maintained.

As a method of manufacturing the glass run 10, a method of simultaneously extruding a soft thermoplastic resin material and a hard thermoplastic resin with an extruder is adopted.

In order to manufacture the glass run 10a, a separately prepared metal core material 13 is inserted into an extruder and simultaneously extrusion molded with the soft rubber material 11.

On the other hand, in order to adapt the above-mentioned glass run 10 or glass run 10a to the shape of the corner portion of the window or door of the automobile, it is necessary to bend the glass run 10 or the glass run 10a according to the curvature of this corner portion. The bending jig 15 is used. The jig 15 is composed of an upper mold 17 and a lower mold 19. The lower mold 19 is formed with a recess 19a having a specific curvature, and the recess 19 is formed on the lower surface of the upper mold 17.
A convex portion 17a corresponding to a is formed.

When the bending jig 15 is used, in the case of the glass run 10 made of the thermoplastic resin material, a predetermined portion is partially heated to be softened, and then the jig 1 is used.
5 is sandwiched between the upper mold 17 and the lower mold 19 to be pressed and deformed, and then cooled or left to stand while maintaining the state. In this way, as shown in FIG. 18, the so-called "buckling" in which the glass run 10 or the glass run 10a is curved along the corner shape of the window of the automobile or the like.
Is carried out.

The partial heating of the glass run 10 is performed by hot air, hot water, hot oil spray dipping, or the like.
A high frequency heating or ultrasonic heating means is used.

[0009]

However, in the case of such a conventional method for manufacturing a weather strip, when the weather strip is subjected to "curling" in accordance with the corner shape of the automobile by the jig 15 for bending. In the structural example of the grass run 10 shown in FIG. 15, the lips 3a and 5a made of a soft thermoplastic resin material are likely to be deformed by partial heating of the grass run 10, so that the quality of the product is deteriorated by so-called heat. In the example of the grass run 10a shown in FIG.
The metal core material 13 is deformed irregularly by the external force from the core material 5, and the surface of the soft rubber material 11 is also deformed irregularly by the influence of the core material 13. Thirteen
There is a problem in that a large external force is required to bend and the expensive equipment cost is required.

Therefore, the present invention solves the problems of the conventional method for manufacturing a weather strip, and eliminates the deterioration of the quality of the product and the unnatural deformation due to the use of the bending jig. It is an object of the present invention to provide a method for manufacturing a weather strip that can be manufactured without increasing the appearance and without requiring expensive equipment costs.

[0011]

In order to achieve the above-mentioned object, the present invention integrally extrudes a base portion made of a thermoplastic resin and a seal portion made of a soft rubber material by multiple extrusion means, The seal part is vulcanized through a vulcanization tank, and the base part under softening condition is pressed and deformed together with the seal part in a bending jig, and is cooled or left to stand naturally, whereby the automobile window is put in a predetermined position. Alternatively, the present invention provides a method for manufacturing a weather strip in which a curved portion that matches the curvature of a corner portion of a door is formed.

[0012]

According to such a weather strip manufacturing method, the base portion made of the thermoplastic resin and the seal portion made of the soft rubber material are integrally extruded by the multiple extrusion means, and the seal portion is vulcanized through the vulcanization tank. Then, the base portion under the softened state is pressed and deformed together with the seal portion in a bending jig, and then cooled or left to stand naturally to form a curved portion that matches the curvature of the corner portion of the window or door of the automobile. The formed weather strip is manufactured. Therefore, a weather strip with improved sealing performance and appearance can be obtained.

By changing the shape of the head for the multiple extrusion means, a weather strip in which the base portion and the seal portion are integrally attached and formed, or a core made of a soft rubber material and a hard base portion made of a thermoplastic resin material is used. As a result, a weather strip or the like included as a material can be manufactured, which can be applied to the manufacture of other devices, so that the versatility is wide.

[0014]

EXAMPLES Various examples of a method of manufacturing a weather strip according to the present invention will be described below. FIG. 1 is a schematic view showing a first embodiment of the present invention. In the figure, 21 is a rubber extruder, and a rubber passage 23 led out from the rubber extruder 21 is communicated with a composite extrusion head 25. .. An unvulcanized rubber material is supplied to the rubber extruder 21.

On the other hand, 27 is a thermoplastic resin extruder arranged in parallel with the rubber extruder 21, and a resin passage 29 led out from the resin extruder 27 is communicated with the composite extrusion head 25. A resin material such as polyethylene (PE) or polypropylene (PP) is usually supplied into the thermoplastic resin extruder 19.

31 is a vulcanization tank through which the composite molded body 33 extruded by the composite extrusion head 25 passes, 35 is a cooling tank, 37 is a take-off machine, 39 is a cutter, 41 is a cut weather strip unit, 15 Is a bending jig. The bending jig 15 is composed of an upper die 17 and a lower die 19 as described in FIG. 17, the lower die 19 is formed with a concave portion 19a having a specific curvature, and the lower surface of the upper die 17 is formed. A convex portion 17a corresponding to the concave portion 19a is formed on the.

As the rubber material, ethylene propylene rubber (EPDM), styrene-butadiene rubber (S
BR), polychloroprene (CR), acrylonitrile-butadiene / vinyl chloride copolymer (NBR / PV
C), chlorosulfonated polyethylene (CSM), acrylic rubber (ACM), silicone rubber and the like are used alone or in a blend. Polymers, carbons, oils, and vulcanizing agents are usually properly mixed in these rubber materials. MAF, FEF, S as polymer and carbon
Using RF grade products, oils are paraffinic, naphthenic, aromatic, and dioctyl phthalate (DO
P), dioctyl adipate (DOA) is used. As the vulcanization accelerator, thiazole, thiuram, and guanidine dithiocarhemate are used according to the vulcanization conditions.

Further, as the thermoplastic resin, in addition to the above-mentioned polyethylene resin or polypropylene resin, ethylene-vinyl acetate copolymer resin (EVA), polyamide (P
A), polyacetal (POM), polycarbo, polysulfone, polyvinyl chloride resin (PVC), ionomer, polyphenylene oxide, polysulfone, and other resins; It can be selectively used depending on the purpose of use.

According to such a first embodiment, the rubber extruder 2
The unvulcanized rubber supplied from No. 1 via the rubber passage 23 and the thermoplastic resin supplied from the thermoplastic resin extruder 27 via the resin passage 29 are doubly extruded by the composite extrusion head 25, A composite molded body 33 is obtained. In this composite molded body 33, as shown in FIG. 2, a pair of lips 45, 47 made of soft rubber are obliquely provided inward from the opening end of a base portion 43 made of a thermoplastic resin formed in a substantially U-shaped cross section. It has a structured structure. The pair of lips 45, 47 constitutes a seal portion 50 as a weather strip.

The composite molded body 33 is heated in the vulcanization tank 31 shown in FIG.
The sheet is appropriately cut by a cutting machine 39 via 7 to obtain a weather strip unit 41.

The weather strip unit 41 is
Partially heated in step 49, then the upper mold 17 of the jig 15
It is sandwiched between the upper mold 17 and the lower mold 19 and is pressed and deformed by the convex portion 17a formed on the lower surface of the upper mold 17 and the concave portion 19a having a specific curvature formed on the lower mold 19. In this way, the weather strip unit 41 is provided with a curved portion that matches the curvature of the corner portion of the window or door of the automobile. After the pressing deformation, the jig 15 is cooled or left to stand while maintaining its state, whereby the "straightening" to the weather strip unit 41 is completed.

FIG. 3 is a schematic diagram showing a second embodiment of the present invention, in which the same components as those in the first embodiment are indicated by the same reference numerals. In the second embodiment, the cooling tank 35 in the first embodiment is omitted, so that the composite molded body 33 is cut from the vulcanization tank 31 via the take-up machine 37 to the cutting machine 3.
It is appropriately cut at 9, and the weather strip unit 41
Is obtained.

FIG. 4 shows an example of the structure of the glass run 30 as the weather strip unit 41 obtained in the above second embodiment. As shown in the drawing, a soft rubber material including a seal portion 50 composed of lips 45 and 47. A base portion 43 made of a hard thermoplastic resin is embedded inside 11 while maintaining a substantially U-shaped cross section. Therefore, the base portion 43 has a function as the core material 13 (see FIG. 16) in the conventional example.

According to the process shown in FIG. 3, the composite molded body 3
Since 3 does not pass through the cooling tank, the heat in the vulcanization tank 31 remains in the obtained weather strip unit 41. Therefore, after cutting by the cutting machine 39, the above-mentioned FIG.
The partial heating step 49 in step 1 is omitted and the pressing deformation step using the jig 15 is immediately started to form a curved portion that matches the curvature of the corner portion of the window or door of the automobile as in the above example. ..

FIG. 5 is a schematic diagram showing a third embodiment of the present invention, in which the same components as those in the first and second embodiments are designated by the same reference numerals. In the third embodiment, the molded body 51 extruded from the rubber extruder 21 enters the vulcanization tank 31, is vulcanized, and is then taken by the take-out machine 37. At this stage, as shown in FIG.
It has a shape composed of a soft rubber material having a substantially U-shaped cross section having the lips 45, 47 as shown in FIG.

Next, the molded body 51 is the composite extrusion head 2
5, the composite extrusion head 25 is communicated with a passage 29 led out from the thermoplastic resin extruder 27, and the composite extrusion head 25 causes the outer surface of the molded body 51 as shown in FIG. A glass run 40 having a shape in which a base 43 made of a thermoplastic resin that is harder than the rubber material of the seal portion is adhered and formed thereon is obtained as the composite molded body 33. The composite molded body 33 is cooled in the cooling tank 35, and is appropriately cut by the cutting machine 39 via the take-up machine 37 to obtain the weather strip unit 41.

This weather strip unit 41 is
Partially heated in step 49 as in the example shown in FIG.
Next, the jig 15 is sandwiched between the upper mold 17 and the lower mold 19 to form a curved portion matching the curvature of the corner portion of the window or door of the automobile.

FIG. 8 is a schematic view showing a fourth embodiment of the present invention. In the fourth embodiment, the thermoplastic resin harder than the rubber material of the seal portion extruded from the thermoplastic resin extruder 27 is cooled. It is cooled in the tank 35 and taken by the take-out machine 37. At this stage, as shown in FIG. 9, a molded body 53 made of a thermoplastic resin and having a substantially U-shaped cross section is formed as a base portion.

Next, this molded body 53 is the composite extrusion head 2
5, the composite extrusion head 25 is communicated with a passage 23 led out from the rubber extruder 21, and the composite extrusion head 25 uses the molded body 53 as a base as shown in FIG. Lips 45, 4 around the base
The glass run 60 having a shape in which the soft rubber material 11 including the seal portion 50 configured by 7 is integrally attached is obtained as the composite molded body 33. This glass run 60 has a shape in which a molded body 53 made of a thermoplastic resin is embedded inside a soft rubber material 11 as in the example shown in FIG. It has a function as the material 13.

The composite molded body 33 is vulcanized in the vulcanizing tank 31 and appropriately cut by the cutting machine 39 via the take-up machine 37 to obtain the weather strip unit 41. Since the heat in the vulcanization tank 31 remains in this weather strip unit 41 as in the example shown in FIG. 3, the partial heating step in the first embodiment is omitted, and after cutting by the cutting machine 39. Immediately after that, the process shifts to a pressing and deforming process using the jig 15, and a curved portion that matches the curvature of the corner portion of the window or door of the automobile is formed.

In the case of the glass run 60 shown in FIG. 10, a metal wire 71 such as a piano wire or a wire 71 is formed together with the molded body 53 at a neutral position in the bending direction when bending the glass run 60 or inside the bending direction. By embedding the above, the workability in bending the glass run 60 can be improved, and unnecessary shrinkage of the finished product by the metal wire 71 can be suppressed.

11 to 14 are perspective views showing various product examples obtained by using the method for manufacturing a weather strip according to the present invention. FIG. 11 shows an example in which the present invention is applied to a door weather strip 55. Indicates. That is, the door weather strip 55 comprises a hollow lip 57a made of a soft rubber material and a base portion 57b. The base portion 57b made of a thermoplastic resin is embedded inside the base portion 57b. It is molded. This base 4
The base portion 57b including 3 is fitted and fixed to the vehicle body side panel.

FIG. 12 shows an example in which the present invention is applied to a window molding 59 fitted to the peripheral portion of a window glass 61. The wind molding 59 is composed of a molding main body 59a made of a soft rubber material, and a leg portion 59b protruding from the lower surface of the molding main body 59a and bent in the direction of the windshield 61 from a substantially middle portion. The leg 59b
A base portion 43 made of a thermoplastic resin is integrally formed inwardly in the state of being bent into a substantially L-shaped cross section. This base 4
The presence of 3 enhances the sandwiching property of the wind glass 61.

FIG. 13 shows an example in which the present invention is applied to the trunk weather strip 63. The trunk weather strip 63 has a welt portion 63a made of a hard rubber material.
And a hollow lip portion 63b made of a soft rubber material, the welt portion 63a and the hollow lip portion 63b.
The base portion 43 made of a thermoplastic resin is integrally molded in a boundary portion between and. The presence of the base portion 43 enhances the rigidity at the boundary portion between the welt portion 63a and the hollow lip portion 63b, and by deforming the base portion 43 when the corner portion is squeezed, the hollow lip portion 63b is deformed at the corner portion. Can be suppressed. That is, it is possible to obtain the effect of deforming the base portion 43 in the direction opposite to the direction in which the hollow lip portion 63b falls at the corner portion.

FIG. 14 shows an example in which the present invention is applied to a hose 65 having an appropriate bent portion. The hose 65 is integrally molded in a state where a cylindrical base portion 43 made of a thermoplastic resin is embedded inside a hose body 65a made of a soft rubber material. Due to the presence of this base 43, the hose 65
The rigidity of the hose 65 is increased, and the bent portion of the hose 65 is maintained in a predetermined shape.

[0036]

As described in detail above, according to the method of manufacturing a weather strip of the present invention, the base portion made of a thermoplastic resin and the seal portion made of a soft rubber material are extruded integrally by multiple extruding means. After the molded part is vulcanized through the vulcanization tank, the base part in the softened state is pressed and deformed together with the seal part in the jig for bending, so that the curvature of the corner part of the window or door of the car It is possible to manufacture a weather strip having a curved portion adapted to. Therefore, the weather strip surface is not unnaturally deformed or wrinkled due to an external force when the weather strip is subjected to the "curling" according to the corner shape of the automobile, and the sealing property is improved and the appearance is enhanced. A weather strip can be obtained. Furthermore, there is an effect that a large external force for bending the weather strip is not required, and the equipment cost of the jig or the like can be reduced.

By changing the shape of the head for the multiple extrusion means, a weather strip in which a base portion and a seal portion are integrally formed is formed, or a base portion of a hard thermoplastic resin material in a soft rubber material is included as a core material. The weather strip and the like can be manufactured and can be applied to the manufacture of other products, and the effect of wide versatility is exhibited.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a first embodiment of a method of manufacturing a weather strip according to the present invention.

FIG. 2 is a partial perspective view showing an example of a weather strip obtained according to the first embodiment.

FIG. 3 is a schematic diagram showing a second embodiment of the present invention.

FIG. 4 is a cross-sectional view showing an example of a weather strip obtained by the second embodiment.

FIG. 5 is a schematic diagram showing a third embodiment of the present invention.

FIG. 6 is a partial perspective view showing an example of the shape of a molded product in the intermediate step of the third embodiment.

FIG. 7 is a partial perspective view showing a shape example of a molded body in another intermediate step of the third embodiment.

FIG. 8 is a schematic diagram showing a fourth embodiment of the present invention.

FIG. 9 is a partial perspective view showing an example of the shape of a molded body in the intermediate step of the fourth embodiment.

FIG. 10 is a partial perspective view showing a shape example of a molded body in another intermediate step of the fourth embodiment.

FIG. 11 is a partial perspective view when the present invention is applied to a door weather strip.

FIG. 12 is a partial perspective view when the present invention is applied to a wind molding.

FIG. 13 is a partial perspective view when the present invention is applied to a trunk weather strip.

FIG. 14 is a partial perspective view when the present invention is applied to a hose.

FIG. 15 is a cross-sectional view showing the structure of a glass run as an example of a normal weather strip.

FIG. 16 is a sectional view showing a structural example of another grass run.

FIG. 17 is an exploded perspective view showing an example of a jig for bending a grass run.

FIG. 18 is a partial perspective view showing an example of a curved weather strip.

[Explanation of symbols]

15 ... jig, 17 ... upper mold, 17a ... convex portion, 19 ... lower mold,
19a ... Recessed part, 21 ... Rubber extruder, 25 ... Composite extrusion head, 27 ... Thermoplastic resin extruder, 30, 40, 60 ... Glass run, 31 ... Vulcanizing tank, 33 ... Composite molded body, 35 ... Cooling tank, 37 ... take-up machine, 41 ... weather strip unit, 43 ... base part, 45, 47 ... lip, 50 ... sealing part, 51, 53 ... molded body, 55 ... door weather strip, 59 ... wind molding, 63 ... trunk weather strip, 65 …hose.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Togami 330 Naganuma-cho, Chiba City, Chiba Prefecture Kinugawa Rubber Co., Ltd.

Claims (1)

[Claims] 1. A base part made of a thermoplastic resin and a seal part made of a soft rubber material are integrally extruded by a multi-extrusion means, and then the seal part is vulcanized through a vulcanization tank to be further softened. By pressing and deforming the base portion together with the seal portion in a bending jig, and cooling or leaving it to stand naturally, a curved portion matching the curvature of the corner portion of the window or door of the automobile is formed at a predetermined position. A method for manufacturing a weather strip, comprising: