JPH01304923A - Manufacture of opening trim - Google Patents

Abstract

PURPOSE:To manufacture a trim finished into a suede in its designed rubber surface in an excellent productivity by molding a trim main body with the vulcanized substance of an ethylene propylene rubber composite, and extruding and vulcanizing integrally a separating rubber layer consisting of a rubber material incompatible to the ethylene propylene rubber on the designed rubber surface of the trim main body, after that, tearing off the separating rubber layer. CONSTITUTION:A weatherstrip main body is extrusion-molded, which is formed with a trim part 1A consisting of the vulcanized substance of an ethylene propylene rubber composite and a hollow seal part 6 consisting of a sponge rubber. At this time, the designed rubber surface D of the trim part 1A is cov ered with a separating rubber layer 11 consisting of a sponge rubber material incompatible to the EPR. Here, the combination of the rubber material of the designed rubber surface and the separation rubber layer is of a sponge rubber / solid rubber or sponge rubber / sponge rubber. Next, peeling off the separating rubber layer 11, the designed rubber surface D becomes a suede like appearance. In this manner, a trim can be obtained without polluting the work environment and in an excellent productivity.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application> The present invention relates to a method for manufacturing an opening trim that is attached to an automobile door in order to hide a vehicle body flange at the opening.

<Prior Art> Here, as shown in FIGS. 5 and 6, a door weather strip in which an opening trim, that is, a trim portion 1 is integrated with a hollow seal portion 6, will be described as an example.

At this time, the trim portion 1 is generally made of solid rubber with the insert 3 embedded therein, and includes a plurality of clamping lips 4.5 that clamp the vehicle body flange 21. Further, the hollow seal portion 6 is generally made of sponge rubber. In addition, as a rubber material, ethylene propylene rubber (EPR) has poor weather resistance, ozone resistance, heat resistance, etc.
use.

With the recent increase in demand for improving the design of automobile interiors, instead of extruded products as shown in Fig. 5, solid rubber is being used as shown in Fig. 6. After the designed surface part of the trim part 1 is covered with the sponge rubber layer (becomes the designed rubber surface) 2 extending from the hollow seal part 6 and co-extruded, the integral skin of the sponge rubber layer 2 is covered with a wire brush or the like. Remove and trim part (trim body)
The design of No. 1 is covered with a rubber surface that has a suede-like appearance.

<Problems to be Solved by the Invention> However, the method for making the designed rubber surface have a suede-like appearance does not require uniform removal of the integral skin of the sponge rubber layer (necessary to obtain a beautiful suede-like appearance) and other methods. Special techniques were required to do this without damaging the parts, and productivity was poor. In addition, when removing the integral skin, dust is likely to be generated and special attention is required to preserve the working environment.In view of the above, the present invention has good productivity.
Another object of the present invention is to provide a method for manufacturing an opening trim that does not require special attention to preserving the working environment.

Means for Solving the Problems> The method for manufacturing an opening trim of the present invention solves the above problems with the following configuration.

Automobile door installation is a method of manufacturing an opening trim that is attached to hide the opening of the vehicle body flange, and the trim body is made of ethylene propylene rubber (EPR).
) A method for manufacturing an opening trim that is molded from a vulcanized compound (hereinafter referred to as "EPR vulcanizate") and in which the designed rubber surface of the trim body has a suede-like appearance. EP with a combination of sponge rubber/solid rubber or sponge rubber/sponge rubber on top.
It is characterized in that after integrally extruding and vulcanizing a release rubber layer made of a rubber material that is poorly compatible with R, the release rubber layer is peeled off to give the designed rubber surface a suede-like appearance.

<Example> Hereinafter, the manufacturing method of the present invention will be explained based on the oral side. Parts that are the same as those in the above description are given the same reference numerals, and a portion of the description will be omitted.

As shown in FIG. 1, the trim part IA of the weather strip
An example will be explained in which the designed rubber surface, which is made of solid rubber, has a suede-like appearance.

First, a weatherstrip body is extruded, which consists of a trim part (trim body) IA in which the insert 3 is embedded and is made of solid rubber, and a hollow seal part 6 made of sponge rubber. The designed rubber surface of part IA is covered with a release rubber layer 11 coextruded with a sponge rubber material that is poorly compatible with EPR (
(See Figure 2).

Here, EPR, which is the base rubber of the weather strip, is EPD, which is an ethylene-propylene-diene terpolymer.
Although M is preferably sulfur vulcanizable through extrusion, it may also be an EPM whose polymer is an ethylene/brobylene di-copolymer. Tables 1 and 2 show each side of the EPDM solid sponge rubber formulation. Note that the vulcanization system for EPDM does not matter whether it is a sulfur vulcanization system or a peroxide vulcanization system;
In the case of PM, it is limited to peroxide vulcanization systems.

On the other hand, NR (
natural rubber), 5BR (styrene propylene rubber), CR
In addition to general-purpose rubbers such as (chloroprene rubber), NBR and tolyl rubber, Q (silicone rubber), FKM (fluororubber), CSM (chlorosulfonated polyethylene), AU (
Examples include special rubbers such as urethane rubber), ACM (acrylic rubber), and ECo (epichlorohydrin rubber), but CR and CS, which have a different vulcanization system from EPR,
M etc. is desirable. Tables 3 and 4 show examples of compounding recipes for each of CR's solid rubber and sponge rubber specifications.

Then, the release rubber layer 11 is peeled off from the extruded vulcanizate having the cross section shown in FIG. Then, at the time of stripping, the solid rubber surface is roughened as on the mouth side, and the designed rubber surface of the trim portion IA has a suede-like appearance.

In the above embodiment, the material of the decorative rubber surface of the trim part IA is solid rubber, and the release rubber layer 11 is a sponge rubber layer. Covered with a sponge rubber layer 12 (forming a designed rubber surface) extending from the hollow seal part 6, further covered with a release rubber layer 11A (IIB), and after coextrusion vulcanization, The release rubber layer 11A (IIB) may be peeled off to reveal a suede-like appearance on the designed rubber surface made of sponge rubber due to roughening at the time of peeling.

At this time, the combination of the rubber material of the designed rubber surface and the release rubber layer is sponge rubber/solid rubber (FIG. 3) or sponge rubber/sponge rubber (FIG. 4).

In addition, the thickness of the release rubber layer 11 (IIA, IIB) is
If the thickness is strong enough to be peeled off, it is desirable to make it as thin as possible from the viewpoint of saving materials, and in the case of solid rubber specifications,
It is usually 0.1 to 2 mmt, and in the case of sponge rubber specifications, it is usually 0.2 to 4 mmt.

<Operations and Effects of the Invention> The method for manufacturing an opening trim of the present invention is a method for manufacturing an opening trim that is attached to an automobile door in order to hide a vehicle body flange at the opening, and the trim body is made of ethylene propylene. Molded from a vulcanizate of rubber (EPR) compound (hereinafter referred to as "EPR vulcanizate"),
In a method for manufacturing an opening trim in which the designed rubber surface of the trim body has a suede-like appearance, a combination of sponge rubber/solid rubber or sponge rubber/sponge rubber that is compatible with EPR is applied to the designed rubber surface of the trim body. After integrally extruding and vulcanizing the release rubber layer made of bad rubber material,
By peeling off the release rubber layer and giving the designed rubber surface a suede-like appearance, the following functions and effects can be achieved.

By peeling off the release rubber layer, which is integrally extruded and vulcanized with a rubber material that is incompatible with the rubber material (EPR) of the designed rubber surface, from the designed rubber surface made of EPR, the integra of the sponge rubber layer can be removed as in the conventional method. A beautiful suede-like appearance can be obtained on the designed rubber surface of the trim without removing the Ruskin with a wire brush or the like.

Therefore, no special technique is required to obtain a beautiful suede-like appearance on the designed rubber surface, and productivity is improved. Further, there is no need to consider the generation of dust when forming a suede-like appearance on the designed rubber surface, and no special attention is required to preserve the working environment.

In addition, using a crosshead type extruder, the extrudate having the cross section shown in Fig. 2 was vulcanized and molded (200°C hot air x 5 minutes), left for 24 hours, and the release rubber layer 11 was peeled off. A weather strip having the cross section shown in FIG. 1 was obtained. Here, the materials shown in Table 1.2.4 are used for the trim part IA, the hollow seal part 6, and the release rubber layer 11, respectively, and
The thickness of the release rubber Fitt was 1 mm. The rubber surface of the weatherstrip trim has a beautiful suede-like appearance.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an example of a weather strip obtained by the manufacturing method of the present invention, FIG. 2 is a cross-sectional view of the main body extruded when manufacturing the weather strip of FIG. 1, and FIG. 3 is a manufacturing method of the present invention. FIG. 4 is a cross-sectional view immediately before peeling off the release rubber layer showing another embodiment of the manufacturing method of the present invention; FIG. FIG. 6 is a sectional view showing another conventional example of a weather strip to which the present invention can be applied. 1. IA...trim part, 2.12... sponge rubber layer, 6... hollow seal part, 11, IIA, IIB... release rubber layer, D... designed rubber surface. Figure 1 Figure 2 Figure 1, IA...Trim portion 2.12...Sponge rubber layer 6...Hollow seal portion 11.11A, IIB...Peelable rubber layer D...Design rubber surface

Claims (1)

[Claims] A method for manufacturing an opening trim that is attached to cover a vehicle body flange of a door mounting opening of an automobile, the trim body being made of a vulcanized product of an ethylene propylene rubber (EPR) compound (hereinafter referred to as In a method for manufacturing an opening trim in which the designed rubber surface of the trim body has a suede-like appearance, a sponge rubber/solid rubber is molded on the designed rubber surface of the trim body. Or a combination of sponge rubber/sponge rubber, E
A method for manufacturing an opening trim, comprising the steps of integrally extruding and vulcanizing a release rubber layer made of a rubber material that is poorly compatible with PR, and then peeling off the release rubber layer to give the designed rubber surface a suede-like appearance. .