JPH11147231A - Weather strip and method for molding the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need to provide a partition plate in a die. SOLUTION: In a method wherein a weather strip 1 having parts comprising different molding materials is molded by extrusion and the strip 1 is subjected to a die molding to bend it, a part defining the barrier of a different molding material is extended from an end surface of an extruded part W. The extended part 6 is put into a die to form cavities and different molding materials are injected respectively into the formed cavities.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weather strip used as a sealing material for an opening of a vehicle body of an automobile, and a method of forming the same.

[0002]

2. Description of the Related Art A door side weather strip is formed of a hollow lip portion which is in close contact with an opening of a vehicle body and a molding portion which is attached to a sash. The former is formed of sponge rubber, and the latter is formed of solid rubber. General. Further, the portion attached to the corner portion of the sash may have a different cross-sectional shape from the other portions. In such a case, the extruded weather strip pieces are connected by molding.

When different molding materials are simultaneously injected into a cavity in a mold, the molding materials are mixed on the way or a boundary position between different materials is shifted. Therefore, as shown in Japanese Patent Application Laid-Open No. 4-305415, one of the molding materials is injected in advance with the cavity separated by a partition plate, and then the partition plate is receded and another molding material is injected. doing.

[0004]

However, in such a method, the partition plate must be disposed in the cavity of the mold so as to be able to advance and retreat, so that the structure of the mold becomes complicated and maintenance is troublesome. In addition to the necessity, there is a possibility that the molding material may enter the sliding gap of the partition plate and the partition plate may not move.

[0005] In view of such circumstances, an object of the present invention is to provide a weather strip which does not require a partition plate in a mold and a method of forming the same.

[0006]

According to the present invention, there is provided a molding method comprising the steps of: extruding a weatherstrip having a different portion of a molding material; forming the weatherstrip in a mold; In advance,
After extending a portion serving as a boundary between different molding materials from the end face of the extruded portion, and loading the extended portion into a mold to separate the cavities, different molding materials are provided to each of the separated cavities. Is injected.

In order to solve the above-mentioned problems, the weatherstrip of the present invention has an extruded portion having different portions of the molding material, and a portion serving as a boundary between the different molding materials extends from an end face of the extruded portion. An extension portion and a molding portion formed by loading the extension portion into a mold to separate a cavity, injecting a different molding material into each of the separated cavities, and bending and forming an extruded portion. It is characterized by becoming.

[0008]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 2 shows a weather strip used in the first embodiment of the present invention. The weatherstrip piece 1 'is formed by extrusion molding, and includes a hollow lip portion 2 which is in close contact with an opening of a vehicle body, and a molding portion 3 which extends from a base of the hollow lip portion 2 and is capped with a sash. .

The weather strip piece 1 'has a hollow lip 2 and a part of its base formed of sponge rubber, and the molding 3 and another part of the base of the hollow lip 2 formed of solid rubber. A substantially rectangular notch 4 is formed from the hollow lip 2 side, and an opposing wedge-shaped notch 5 is formed from the molding side. These cutouts 4 and 5 are opposed to each other, and a portion serving as a boundary between the sponge rubber molded part U and the solid rubber molded part Y is formed so as to extend from the cutout surface. It is composed only of solid rubber.

When the weatherstrip piece 1 'is loaded into a mold, the cavity 7 is separated by the extension 6 into a sponge rubber injection area 7a and a solid rubber injection area 7b, as shown in FIG. Therefore, after injecting the solid rubber from the gate 8 into the solid rubber injection region 7b, the sponge rubber may be injected from the gates 9, 9 into the sponge rubber injection region 7a.

FIG. 1 shows a bent portion of the weather strip 1 thus formed. In the figure, the dashed line indicates the boundary between the extruded portion W and the molded portion X, and the cutouts 4 and 5 are molded with sponge rubber and solid rubber, respectively.

According to this embodiment, the cavity 7 in the mold is provided.
The molding material can be injected while being separated by the extending portion 6 of the weather strip piece 1 ′, so that it is not necessary to provide a partition plate in the mold, the structure of the mold is simplified, and the operation of the partition plate is simplified. There is no danger that the molding will stop due to the failure.

FIG. 5 shows a second embodiment of the present invention.

In this embodiment, the molding 3 of the weatherstrip 1 is arranged only in the portion corresponding to the upper side of the sash, and the end 3a has an irregular cross section corresponding to the shape of the sash. The other parts are the same as those of the first embodiment, so the same reference numerals are given and the description is omitted. For this reason, the weather strip pieces 1A and 1B having different cross-sectional shapes as shown in FIGS. 6A and 6B are used, but the weather strip piece 1A has the hollow lip portion 2 and the molding portion 3 in different levels. The cutout extends from the cutout surface to the boundary between the sponge rubber molded part U and the solid rubber molded part V. Then, molding materials of sponge rubber and solid rubber are injected respectively by separating the cavities in the mold with the extending portions 6 made of the solid rubber.

[0016]

According to the present invention, since the molding material can be injected by separating the cavity in the mold with the extension of the weather strip, it is not necessary to provide a partition plate in the mold. The structure of the mold is simplified, and there is no danger that the molding will stop due to the inoperability of the partition plate.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of a weather strip used in the embodiment.

FIG. 3 is a view showing a mold used in the embodiment; FIG.
Sectional drawing corresponding to line -A.

FIG. 4 is a view for explaining a material injection order of the mold.

FIG. 5 is a perspective view showing a second embodiment of the present invention.

FIG. 6 is an exploded perspective view of a weather strip used in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Weather strip 6 ... Extension part 7 ... Cavity U ... Sponge rubber molding part V ... Solid rubber molding part W ... Extrusion molding part X ... Mold molding part

Claims (2)

[Claims] 1. A method for extruding a weatherstrip having a different portion of a molding material and subjecting the weatherstrip to a molding process to bend the portion, the portion being a boundary between different molding materials from an end face of the extruded portion in advance. The method of molding a weatherstrip, wherein a cavity is separated by loading the extending portion into a mold to separate the cavities, and then a different molding material is injected into each of the separated cavities. 2. An extruded portion having a different portion of a molding material, an extension portion extending from an end surface of the extruded portion portion to a boundary between different molding materials, and And a molded part formed by bending an extruded part by injecting a different molding material into each of the separated cavities.