JP3379437B2 - Weather strip - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weather strip formed by connecting extrusion-molded parts with a mold-molded part.

[0002]

2. Description of the Related Art FIGS. 5 to 8 show a conventional opening trim 50 which is one of weather strips. In this opening trim 50, the connecting end faces of the two extruded molding portions 51 are straightly connected by a molding portion 61. S is a boundary line (connection end surface) between the extrusion molding part 51 and the mold molding part 61.

The extrusion molding section 51 of FIG. 7 is also the molding section 6 of FIG.
1 is also a mounting portion 52, 62 having a substantially U-shaped cross section, which is mounted on a flange (not shown) around the door opening of the automobile body.
And hollow seal portions 53 and 63 that are elastically deformed when contacted by a door (not shown). Furthermore, the extrusion molding unit 51
The (here, only one of the two) has a design lip portion 54 that protrudes from the attachment portion 52 and covers the edge portion of the inner garnish (not shown).

In the extruded portion 51 of FIG. 7, the mounting portion 52 and the design lip portion 54 are solid EPDM (ethylene / propylene / diene copolymer) rubber, and the hollow seal portion 53 is sponge EPDM rubber. Are coextruded. Reference numeral 55 is a sheet metal insert of the mounting portion 52.
A decorative coating 56 is formed on the outer surface from the mounting portion 52 to the design lip portion 54 by heat-welding a resin film, a thermoplastic elastomer film or a fabric (cloth) immediately after extrusion molding them.

The molding portion 61 of FIG. 8 is formed by integrally molding a mounting portion 62 and a hollow seal portion 63 of solid EPDM rubber. Specifically, the connection ends of the two extruded parts 51 are gripped by a mold (not shown) so that the connection end faces are set to face the cavity of the mold, and the solid EPDM rubber material is set in the cavity. Is injected, the molding part 61 is molded, and at the same time, the connection end face of the extrusion molding part 51 is connected to the molding part 61.

[0006]

However, the solid E
The mold temperature when molding the mold portion 61 with PDM rubber is as high as 180 to 200 ° C., and the decorative coating 56 is used at the mold temperature.
Melted, the following measures or measures to prevent or hide the melting were required.

That is, if the decorative coating 56 is present even on the connection end surface of the extrusion molded portion 51, the decorative coating 56 is gripped and melted when the connection end portion of the extrusion molded portion 51 is gripped by the mold. However, melting marks and grip marks are left. Therefore, as shown by the chain double-dashed line in FIG. 5, the decorative coating 56x at the connection end is partially attached to the mounting portion 52 and the design lip portion 54.
At the same time, it was step-cut and removed, and the connection end portion after the removal was held by a mold to prevent melting of the decorative coating 56. However, this step cutting was a very troublesome work.

When the step cut is not performed, the decorative coating 56 is melted as described above to have a melting trace or a gripping trace. Therefore, it is necessary to remove those traces by buffing and hide them. This buffing is also a very troublesome work, and further, the decorative coating 56 provided with a grain pattern is used.
In that case, there was a problem that the grain pattern disappeared, and in the case of the decorative coating 56 made of fabric, buffing could not be performed.

An object of the present invention is to solve the above-mentioned problems and to lower the mold temperature by molding the hollow seal part of the mold molding part with a solid thermoplastic elastomer (hereinafter referred to as TPE), thereby extruding the molding part. Of the hollow seal part of the extruded part extruded with sponge rubber or sponge TPE, and the load required for elastic deformation of the hollow seal part of the die molded part is prevented. To approach the load.

[0010]

The weather strip according to the first aspect of the present invention is a solid TPE between the connection end faces of two extruded parts having a hollow seal part extruded with sponge rubber or sponge TPE. The solid TPE is molded at the rising portion of the hollow seal part of the mold molding part by connecting with the mold molding part having the molded hollow seal part.
The hollow seal part is elastically deformed when the door comes into contact with it.
A hole is formed to reduce the load required for the.

The weather strip according to the second aspect of the present invention is a connecting end face of two extruded parts provided with a hollow seal part extruded from sponge rubber or sponge TPE and a mounting part extruded from rubber or TPE. Between solid TPE
Connected by a mold forming part having a hollow seal part and a mounting part formed by molding, and the hollow seal part of the mold forming part rises.
Hollow seal part molded with the solid TPE
Is formed with a hole for lowering the load required to elastically deform due to the contact of the door .

In the second invention, the design lip portion projecting from the mounting portion may be integrally molded in the mounting portion of the extrusion molding portion. Then, even when a decorative coating made of resin, TPE, or a fabric is provided on the outer surface of the attachment portion of the extrusion-molded portion or the design lip portion, the decorative coating is not step-cut and remains up to the connection end surface. Be done.

In the first or second invention, the shape, size, and number of the punched holes are not particularly limited, and may be round holes, elliptical holes, or the like. Elongated holes (including slits) that extend are preferred. The length of the elongated hole is not particularly limited, but it is preferably 0.4 to 1 times the length of the hollow seal portion of the mold molding portion. When it is shorter than 0.4 times, the effect of lowering the load required for elastic deformation of the hollow seal portion becomes small.

The rubber or TPE of the attachment part of the extruded part is
It may be solid or sponge, but is preferably solid. EPDM rubber can be exemplified as the type of sponge rubber of the hollow seal portion of the extrusion molding portion and rubber of the attachment portion. The sponge TPE of the hollow seal portion and the TP of the attachment portion can be exemplified.
Examples of the type of E include olefin-based TPE (TPO) and styrene-based TPE (SBC).

The types of solid TPE of the hollow seal part and the mounting part of the molding part are olefinic TPE (TP
O), styrene type TPE (SBC), etc. can be illustrated.

Examples of the decorative coating resin include vinyl chloride, and the decorative coating TPE includes TPO and SBC.
Etc. can be illustrated. A pattern such as a grain pattern is preferably formed on the surface of the decorative coating.

[0017]

1 to 4 show an embodiment in which the present invention is embodied in an opening trim which is one of weather strips. This opening trim 10
Between the connecting end faces of the two extruded parts 11 is the molded part 21.
It will be connected straight. S is the extrusion molding unit 1
1 is a boundary line (connection end surface) between 1 and the mold forming portion 21.

The extrusion molding section 11 of FIG. 3 is also the molding section 2 of FIG.
1 also has mounting portions 12 and 22 having a substantially U-shaped cross section, which are mounted on a flange (not shown) around a door opening of an automobile body.
And hollow seal portions 13 and 23 that are elastically deformed when contacted by a door (not shown). Furthermore, the extrusion molding unit 11
(Here, only one of the two pieces may be provided, but both pieces may be provided.) Is provided with a design lip portion 14 that projects from the attachment portion 12 and covers the edge portion of the inner garnish (not shown).

The extruded portion 11 of FIG. 3 is formed by integrally coextruding the mounting portion 12 and the design lip portion 14 with solid EPDM rubber and the hollow seal portion 13 with sponge EPDM rubber. Reference numeral 15 is a sheet metal insert of the mounting portion 12. A decorative coating 16 is formed on the outer surface from the mounting portion 12 to the design lip portion 14 by heat-sealing a TPE film immediately after extrusion molding them.

The mold forming portion 21 of FIG. 4 is formed by integrally molding the mounting portion 22 and the hollow seal portion 23 with solid TPO. Specifically, the connection ends of the two extruded parts 11 are gripped by a mold (not shown) so that the connection end faces are set facing the cavity of the mold, and the solid TPO material is placed in the cavity. By being injected (injected),
At the same time that the mold forming portion 21 is molded, the mold forming portion 21
The connection end face of the extrusion-molded portion 11 is connected to.

The mold temperature when molding the mold part 21 with this solid TPO is as low as 60 to 80 ° C., and the decorative coating 16 does not melt at that mold temperature. Therefore, in the present embodiment, the decorative coating 56 at the connection end portion is left up to the connection end surface without being step-cut. Therefore, the decorative coating 16 is gripped when the connection end portion of the extrusion-molded portion 11 is gripped by the mold, but there is no melting trace or grip trace on the decorative coating 16, so buffing is not necessary. .

However, when the hollow seal portion 23 of the molding portion 21 is molded with solid TPO having a larger elastic coefficient than the sponge EPDM rubber, the load required for elastic deformation of the hollow seal portion 23 is extruded with the sponge EPDM rubber. The load of the molded hollow seal portion 13 becomes larger than that of the same load, which may increase the door closing force.

Therefore, the hollow seal portion 23 of the mold forming portion 21.
A hole 24 for reducing the load required for elastically deforming the hollow seal portion 23 is formed in a part of the above, and the load is brought close to the same load of the hollow seal portion 13. This hole 24
It is efficient that it is formed by the mold structure at the same time as the molding, but it can be perforated after the molding.

The hollow seal portion 23 comprises a rising portion 23a on the U-shaped opening side of the mounting portion 22, a rising portion 23b on the U-shaped non-opening side of the mounting portion 22, and a door facing portion 23c. It is the rising portion 23a and the rising portion 23b that the load is likely to be reduced by forming the ridge, and the rising portion 23a is less visible in the door opening than the rising portion 23b. Therefore, in this embodiment,
A hole 24 is formed in the rising portion 23a. Also,
The hole 24 is an elongated hole extending in the lengthwise direction of the hollow seal portion 23 (left-right direction in FIG. 2).
Is 0.5 to 1 times the length of the hollow seal portion 23.

The present invention is not limited to the above-described embodiment, but can be embodied with appropriate modifications within the scope not departing from the spirit of the invention, for example, as follows.

(1) The attachment portion 12 and the design lip portion 14 of the extrusion molding portion 11 are integrally coextruded by solid TPO, and the hollow seal portion 13 is sponge TPO. (2) Forming the decorative coating 16 with a resin film or a fabric. (3) To be embodied in various weather strips having a seal portion with which an opening / closing member other than a door abuts.

[0027]

As described above in detail, according to the weather strip according to the present invention, the hollow seal portion of the molding portion is molded with solid TPE to lower the mold temperature and melt it in the extrusion molding portion. It is possible to prevent traces and grip marks and to apply the load necessary for elastic deformation of the hollow seal part of the mold molding part to the load of the hollow seal part of the extrusion molding part extruded with sponge rubber or sponge TPE. You can get closer. In addition to the same effect, the weather strip according to the invention of claim 4 does not require step cutting or buffing of the decorative coating.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of an opening trim according to an embodiment of the present invention viewed from a non-opening side of a mounting part.

FIG. 2 is a perspective view of a main part of the opening trim as viewed from an opening side of a mounting part.

FIG. 3 is a sectional view taken along line III-III in FIG.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a perspective view of a main part of an opening trim according to a conventional example as viewed from a non-opening side of a mounting part.

FIG. 6 is a perspective view of a main part of the opening trim as viewed from the opening side of the mounting part.

7 is a sectional view taken along line VII-VII in FIG.

8 is a sectional view taken along line VIII-VIII in FIG.

[Explanation of symbols]

10 opening trim 11 Extrusion molding section 12 Mounting part 13 Hollow seal part 14 Design Lip 15 Sheet metal insert 16 Decorative coating 21 Molding part 22 Mounting part 23 Hollow seal part 24 Hole

Claims (6)

(57) [Claims] 1. A hollow formed by molding a solid thermoplastic elastomer between the connecting end faces of two extruded parts (11) having a hollow seal part (13) extruded with sponge rubber or sponge thermoplastic elastomer. Seal part (2
3) is connected by a mold forming part (21), and the rising part (23 ) of the hollow seal part (23) of the mold forming part (21) is connected.
a) Molded with the solid thermoplastic elastomer
The hollow seal part (23) is elastically deformed by the contact of the door.
A weatherstrip formed with perforations (24) to reduce the load required to shape . 2. A hollow seal portion (13) extruded of sponge rubber or thermoplastic elastomer and a mounting portion (1) extruded of rubber or thermoplastic elastomer.
2), a molding part (21) having a hollow seal part (23) molded with a solid thermoplastic elastomer and a mounting part (22) between the connection end faces of the two extrusion molding parts (11). And the solid part is connected to the rising part (23a) of the hollow seal part (23) of the mold part (21).
Hollow seal part (2
A weather strip formed by forming a punched hole (24) for lowering a load required to elastically deform 3) when the door is brought into contact with the door . 3. The weather strip according to claim 2, wherein a design lip portion projecting from the mounting portion is integrally molded on the mounting portion of the extrusion molding portion. 4. A decorative coating made of a resin, a thermoplastic elastomer, or a fabric is provided on the outer surface of the mounting portion of the extruded molded portion or the design lip portion, and the connection is made without step cutting the decorative coating. Claim 2 left up to the end face
Or the weather strip according to item 3. 5. The elongated hole is an elongated hole extending in the length direction of the hollow seal portion of the mold forming portion.
The weather strip according to 3 or 4. 6. The weather strip according to claim 5, wherein the length of the punched hole is 0.4 to 1 times the length of the hollow seal portion of the mold forming portion.