JP2008006927A - Thermoplastic resin core material for weather-strip - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems that stretch of a weather strip is inhibited and a bending property is deteriorated by melting and adhering a core material to a weather strip at the time of extrusion or vulcanization in a polypropylene core material embedded in an approximate U-sectioned trim part of a weather strip made of EPDM rubber, and that indentations and projections due to slits and holes of the core material are formed on the surface of the trim part to deteriorate a quality of the appearance. <P>SOLUTION: This approximate U-sectioned thermoplastic resin core material is embedded in a trim part of a weather strip for an automobile having an approximate U-sectioned trim part, comprises side walls and a bottom wall connecting both of the side walls, and the opposed side walls are formed into a comb tooth-like shape by slits. The slits are formed to a deep portion including a bent part connecting the side walls and the bottom wall from side wall ends. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a thermoplastic resin core material embedded in a trim portion having a substantially U-shaped cross section of a weather strip mounted on a door opening edge of a vehicle body or around a door.

  FIG. 1 shows both side walls which are embedded in the trim portion 1 of an opening weather strip 3 having a trim portion 1 having a substantially U-shaped cross section shown in FIG. 2 and a hollow seal portion 2 formed integrally with the trim portion 1 and facing each other. Shows a fishbone type core material 5 that is formed in a comb-teeth shape by slits 4. As a core material of this type, a core metal has been conventionally used in many cases. However, due to demands for weight reduction and recyclability. In recent years, those made of thermoplastic resins such as polyethylene and polypropylene have been used.

  The core material has flexibility in order to improve the followability when the weather strip is attached to the corner portion, and the appearance due to the formation of irregularities by the comb-shaped core material on the trim portion surface It is desired to solve the problem.

  The present invention has been made in view of the above points, and a first object is to improve the flexibility by slightly changing the shape as compared with the conventional thermoplastic resin core material, and to improve the weather at the corner portion. A thermoplastic resin core material capable of improving the bendability of the strip is provided. A second object is to provide a core material that is not fused to the weather strip during extrusion molding or vulcanization. Accordingly, an object of the present invention is to provide a thermoplastic resin core material capable of improving the bendability at the corner portion of the weather strip and the appearance quality by eliminating the unevenness.

  The invention according to claim 1 is embedded in the trim portion of a weather strip for an automobile having a trim portion having a substantially U-shaped cross section, and includes a side wall and a bottom wall connecting both side walls, and the opposite side walls are slits. In the thermoplastic resin core material having a substantially U-shaped cross section formed in a comb-like shape, the slit is formed deeply from the side wall end to a portion including a bent portion connecting the side wall and the bottom wall. To do.

  The invention according to claim 2 is a rubber-like elastic body provided with a trim portion having a substantially U-shaped cross section, for example, a rubber material such as an olefin thermoplastic elastomer TPO, a thermoplastic elastomer TPE such as a styrene thermoplastic elastomer TPS, or an EPDM. A thermoplastic resin core material having a substantially U-shaped cross-section embedded in the trim portion of an automotive weather strip, which is fused with the weather strip made of the rubber-like elastic body by heat during molding or vulcanization. It is characterized in that it is formed of a material that does not adhere or is coated with a material that does not fuse with the weatherstrip.

  Weather strip made of rubber elastic material and materials not fused by heat or pressure during molding or vulcanization, for example, polyethylene terephthalate PET, epoxy resin, phenol resin, polyvinylidene chloride, polyvinyl alcohol, polyamide (66 nylon), cellulose, isobutane, thermoplastic polyurethane resin TPU, styrenic thermoplastic resin TPS, and the like can be used.

  The coating with the material is formed by, for example, co-extrusion at the time of extrusion molding and integrally forming, or by dipping (so-called soaking) or spray coating. The material used for the coating is, for example, in the case of coating by coextrusion, the rubber-like elastic body is EPDM, the coating material is styrene-based thermoplastic resin TPS or thermoplastic polyurethane resin TPU, and in the case of immersion or spray coating A paint containing a lubricant (silicone oil or the like) is used.

  According to the first aspect of the present invention, compared with the conventional core material made of thermoplastic resin, the flexibility of the core material is remarkably improved only by forming the slit deeply to the part including the bent portion. The bendability was greatly improved. Furthermore, since the slit reaches the part including the bent portion and does not reach the bottom wall, the bottom wall is kept smooth with no irregularities. Thereby, after the product is extruded by the rubber-like elastic body, the surface of the rubber-like elastic body which is the design surface and is extruded onto the smooth surface of the core material becomes a smooth surface without unevenness.

  If the core material is fused and adhered to the weather strip, the weather strip is hindered from being stretched when the weather strip is bent, and the bendability is impaired. In addition, the core material has slits and holes formed in order to have bendability. However, if the core material is fused to the weather strip, irregularities are easily formed on the surface of the trim portion by the slits and holes. In this regard, as in the invention according to claim 2, if the core material is formed or covered with a material that is not fused to the weather strip, it is bonded by heat and pressure during extrusion molding and heat during vulcanization. Even if it does not stick, the strength of the sticking will be weakened, so the weather strip will not be hindered, the bendability will be improved, and irregularities due to the slits and holes in the core will be formed on the trim surface. The appearance quality can be improved.

Hereinafter, a core material according to an embodiment of the present invention will be described with reference to the drawings.
The core material 11 shown in FIG. 3 has a slit 12 in which the slit 4 of the conventional thermoplastic resin core material 5 having a substantially U-shaped cross section shown in FIG. 1 is formed deeply to the bent portion 5c connecting the side wall 5a and the bottom wall 5b. Thus, there is no difference from the core material 5 shown in FIG.

  The core material 15 shown in FIG. 4 is formed by extruding a thermoplastic polyurethane resin TPU which is difficult to fuse with EPDM as a material for forming a weather strip on the entire surface of a core material body 16 made of polypropylene alone or talc-containing polypropylene. The coating layer 17 is formed. The core material 15 may be a fishbone type as shown in FIG. 1 or another type in which slits or holes are formed.

  The core material 19 shown in FIG. 5 is used for a weather strip made of EPDM, and is made of polypropylene blended with talc.

  The thermoplastic resin core material of the present invention is used for a weather strip provided with a trim portion having a substantially U-shaped cross section.

The perspective view of a part of conventional thermoplastic resin core material. Sectional drawing of the weather strip which embed | buried the core material shown in FIG. 1 in the trim part. The perspective view of a part of thermoplastic resin core material according to the present invention. Sectional drawing of another example of the core material made from a thermoplastic resin concerning this invention. Sectional drawing of another example of the thermoplastic resin core material concerning this invention.

Explanation of symbols

1 .. Trim part 2 .. Hollow seal part 3. Opening weather strips 4, 12.. Slits 5, 11, 15, 19.. Core material 5 a, side wall 5 b, bottom wall 5 c, bent part 16・ Core material body 17 ・ Coating layer

Claims (2)

  The automobile weather strip having a substantially U-shaped cross section 1 is embedded in the trim part 1 and includes a side wall 5a and a bottom wall 5b connecting both side walls 5a. In the thermoplastic resin core material having a substantially U-shaped cross section formed in a comb-teeth shape, the slit 12 is formed deeply from the side wall end to a portion including the bent portion 5c connecting the side wall 5a and the bottom wall 5b. A core material made of thermoplastic resin for weather strips.   A thermoplastic resin core material having a substantially U-shaped cross section embedded in the trim portion 1 of a weather strip for an automobile made of a rubber-like elastic body having a trim portion 1 having a substantially U-shaped cross section, Made of a thermoplastic material for weather strips, which is molded with a material that is not fused to the weather strip made of the rubber-like elastic body by heat during vulcanization, or is coated with a material that is not fused to the weather strip Core material.

Images