JPH05293913A - Production of welt - Google Patents

Abstract

PURPOSE:To obtain a welt equipped with skin material such as cloth and leather at favorable coat. CONSTITUTION:Welt base body 4 is extruded by a composite extrusion head 3 connected to the intermediate part of a rubber extruder 1 and a resin extruder 2. Simultaneously a hot melt adhesive is extruded in the part becoming the external surface of a welt base part. The external surface thereof is coated with the hot melt adhesive. The welt base body 4 is heated and vulcanized in a vulcanization tank 7. Thereby the hot melt adhesive is molten by heating. Accordingly the skin material 8 such as cloth and leather delivered from a roller 8a is laminated on the part coated with the hot melt adhesive just after the welt base body is passed through the vulcanization tank 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a welt to be mounted on the periphery of an opening of a vehicle body such as an automobile.

[0002]

2. Description of the Related Art Some welts for automobiles are used by occupants in order to enhance the decorativeness of welts as disclosed in Japanese Patent Publication No. 3-75369 and Japanese Patent Laid-Open No. 3-253331. It is known that the visible part is covered with a skin material such as cloth or leather.

[0003]

In any of the above cases, after the welt made of a rubber material is extruded and vulcanized,
Since the skin material laminated with the hot melt film in advance is superposed on the required portion of the welt and the hot melt film is heated and melted to adhere the skin material, not only the manufacturing cost of the hot melt film increases. However, it cannot be denied that the cost of laminating and molding the skin material and the hot melt film will be high, which will be a cost disadvantage.

In addition to the above, after the extrusion molding and vulcanization of the welt, an adhesive is applied to a required portion and a skin material is attached thereto. In this case, the application of the adhesive and the adhesive are performed. Is required, and further, an adhesive agent curing treatment step after laminating the skin material is required, resulting in large-scale equipment, and eventually cost is also increased in this case.

Therefore, the present invention provides a method for manufacturing a welt which is provided with a skin material and which is excellent in decorativeness and can be obtained at a low cost.

[0006]

A step of simultaneously extruding a welt base made of a rubber material and a hot melt adhesive covering a required portion of the welt base, a step of vulcanizing the welt base, and a vulcanization Immediately after that, a step of laminating a skin material on the hot melt adhesive coating portion of the welt substrate is included.

[0007]

The hot-melt adhesive material coextruded with the welt substrate is melted in the vulcanization process of the welt substrate. Therefore, the skin material is pasted immediately after the vulcanization of the welt substrate to bond the skin material to the welt substrate. Can be surely adhered to a required portion of.

[0008]

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 schematically shows an apparatus for continuously producing a welt having a skin material. Reference numeral 1 is a rubber material extruder (hereinafter referred to as a rubber extruder), and 2 is a hot melt adhesive. Resin material extruder (hereinafter referred to as resin extruder),
Reference numeral 3 denotes a composite extrusion head which is connected between the rubber extruder 1 and the resin extruder 2 to form a welt base 4 having a predetermined cross-sectional shape. Although not shown, a rubber material extrusion portion and a resin material extrusion portion are shown. A heat insulating material is provided between and.

Reference numeral 5 denotes a cored bar wound around a roller 5a. The cored bar 5 is fed out from the roller 5a and inserted into the composite extrusion head 3, and a rubber material is extruded around the cored bar 5. At the same time, the resin material is extruded.

In this embodiment, the composite extrusion head 3 is used.
Thus, the welt base 4 is formed in a flat plate shape, specifically, a flat plate-shaped welt base portion 4a made of solid rubber in which a core metal 5 is embedded, and a hollow seal lip 4 made of sponge rubber.
b and the welt base portion 4a
The hot melt adhesive 6 is extruded and coated on the outer surface of the.

As the hot-melt adhesive material 6, the rubber material forming the welt base portion 4a is EPT or EPDM.
In the case of, a thermoplastic resin such as olefin resin is used, and when the rubber material is other than EPT or EPDM, P
A thermoplastic resin such as U, PET or PA is used. Further, when the hot melt adhesive 6 is made of a reactive urethane resin, any rubber material can be used.

The welt substrate 4 extruded from the composite extrusion head 3 is heated and vulcanized in the vulcanization tank 7. The heating of the welt substrate 4 in the vulcanization tank 7 melts the hot melt adhesive 6 coated on the welt base portion 4a. Therefore, immediately after passing through the vulcanization tank 7, the hot melt adhesive 6 is melted.
When the is melted, the skin material 8 such as cloth or leather is bonded.

The skin material 8 is wound around a roller 8a,
It is fed out from the roller 8a and is bonded to the hot melt adhesive 6 coated portion of the welt base portion 4a by the pressure roller 9.

The welt substrate 4 to which the skin material 8 is bonded in this manner is guided and passed through the cooling tank 10 to cool and solidify the hot melt adhesive material 6, and thereafter, the welding base portion is applied by the bending roller 11. 4a is bent into a substantially U shape, passed through the take-up machine 12, and then cut into a predetermined length by a cutting machine 13.

Although the welt substrate 4 is extruded into a flat plate by the composite extruding head 3 in the above embodiment,
From the beginning, extrusion molding may be performed in a substantially U-shaped cross section.

The cross-sectional shape of the welt substrate 4 is not limited to this, and it is of course possible to shape it into a substantially U-shaped cross-section which is modified as shown in FIG. 5 according to the application. As shown in FIG. 5, the skin material 8 including the seal lip 4b can be bonded so as to entirely cover the outer surface portion of the welt substrate 4.

As described above, the hot melt adhesive 6 is extruded and coated on the portion of the outer surface of the welt substrate 4 by the composite extrusion head 3 at the same time as the extrusion molding of the welt substrate 4, so that the welts are continuous. There is no need to install dedicated adhesive coating equipment or adhesive drying equipment on the production line, and the equipment can be simplified, or
Since it is not necessary to bond hot-melt formed in advance to the skin material 8, it is possible to realize a significant cost reduction.

In particular, when a reactive urethane resin is used as the hot melt adhesive, it is in a molten state at a relatively low temperature, so that it is between the rubber material extruding part and the resin material extruding part of the composite extrusion head. No heat insulating material is required, and the produced welt has excellent heat resistance.

[0020]

As described above, according to the present invention, a hot melt adhesive is extruded and coated on a required portion of the welt substrate at the same time as the extrusion molding of the welt substrate. Since it can be melted by, and the epidermis material can be pasted and surely adhered immediately after vulcanization, the equipment can be simplified, and the hot melt film laminating of the epidermis material etc. Since pre-molding is unnecessary, a welt including a skin material such as cloth or leather can be obtained at a cost advantage.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an example of an apparatus for carrying out the method of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

3 is a sectional view taken along the line BB of FIG.

FIG. 4 is a cross-sectional view taken along the line CC of FIG.

FIG. 5 is a cross-sectional view showing different shapes of welts.

[Explanation of symbols]

 4 ... Welt substrate 6 ... Hot melt adhesive 8 ... Skin material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Tabata 330, Naganumacho, Inage-ku, Chiba, Chiba Kinugawa Rubber Industry Co., Ltd. (72) Go Kurihara 330, Naganumacho, Inage-ku, Chiba, Chiba Kinugawa Rubber Industry Co., Ltd.

Claims (1)

[Claims] 1. A step of simultaneously extruding and molding a welt base made of a rubber material and a hot melt adhesive covering a required portion of the welt base, a step of vulcanizing the welt base, and a welt base immediately after vulcanization. And a step of laminating a skin material to the hot-melt-adhesive-coated portion of the above.