JP3932289B2

JP3932289B2 - Weather strip for automobile

Info

Publication number: JP3932289B2
Application number: JP2003400645A
Authority: JP
Inventors: 豪甲信; 俊成天王
Original assignee: Nishikawa Rubber Co Ltd
Current assignee: Nishikawa Rubber Co Ltd
Priority date: 2003-10-23
Filing date: 2003-10-23
Publication date: 2007-06-20
Anticipated expiration: 2023-10-23
Also published as: JP2005126026A

Description

本発明は、自動車用ウエザーストリップ、詳しくはその芯材に関するものである。 The present invention relates to a weather strip for automobiles, and more particularly to a core material thereof.

自動車ドアや車体開口縁部に装着される図３及び図４に示すウエザーストリップ７の断面略Ｕ字状のトリム部やオープニングトリムには、図１に展開して示す芯材６が押出し成形により埋設されている。この芯材６の材質として既に提案されている塩化ビニル樹脂、ＡＢＳ樹脂等、或いはポリプロピレン、ポリエチレン、ポリ塩化ビニル等の熱可塑性合成樹脂がある。
〔参考文献１：特公平２−４２３４５号，参考文献２：特開２０００−１４２２６７号〕A core material 6 developed in FIG. 1 is formed by extrusion molding on a trim portion or an opening trim having a substantially U-shaped cross section of the weather strip 7 shown in FIG. 3 and FIG. Buried. Examples of the material of the core material 6 include a vinyl chloride resin, an ABS resin, and the like, or a thermoplastic synthetic resin such as polypropylene, polyethylene, and polyvinyl chloride.
[Reference 1: Japanese Patent Publication No. 2-42345, Reference 2: JP 2000-142267]

ところが、ＥＰＤＭ製のウエザーストリップ７やオープニングトリムに埋設される前記熱可塑性合成樹脂製の芯材６、特にオレフィン系のポリプロピレン樹脂製の芯材６は、ＥＰＤＭと極めて相溶性がよく押出し加硫工程の溶融時、芯材６を被覆するＥＰＤＭとの間に強い融着を起こし易い。そのため、前記ドアや開口縁部湾曲部への組み付け時に追従し難くなるという問題があった。また、押出し成形後前記略Ｕ字状のトリム部７やオープニングトリムにおいて、芯材６の各コア６ａ間の切り欠き部６ｂに当たる部分に広い窪み８を生じ、外観を悪くする問題もあった。
そこで、本発明はかかる従来の課題に鑑みて、ＥＰＤＭ製のウエザーストリップの溶解度指数（以下ＳＰ値と記す）よりも所定値多いＳＰ値を有する材質の芯材を用いることで、融着を起こし難くしてコア間の窪みを縮小し、湾曲部への追従性の改善及び外観の改善等を図った自動車用ウエザーストリップを提供することを目的とする。 However, the thermoplastic synthetic resin core material 6 embedded in the EPDM weather strip 7 and the opening trim, in particular, the olefin-based polypropylene resin core material 6 is very compatible with EPDM and is an extrusion vulcanization process. When melted, it is easy to cause strong fusion with the EPDM covering the core material 6. Therefore, there has been a problem that it becomes difficult to follow when assembled to the door or the opening edge curved portion. In addition, in the substantially U-shaped trim portion 7 and the opening trim after extrusion molding, there is a problem that a wide recess 8 is formed in a portion of the core material 6 that corresponds to the notch portion 6b between the cores 6a, thereby deteriorating the appearance.
Therefore, in view of such conventional problems, the present invention causes fusion by using a core material having a SP value that is larger by a predetermined value than the solubility index (hereinafter referred to as SP value) of a weather strip made of EPDM. It is an object of the present invention to provide a weather strip for an automobile which makes it difficult to reduce the depression between the cores, and improves the followability to the curved portion and the appearance.

Means to solve the problem

かかる目的を達成するために本発明は、図１及び図２に示す如く、ＥＰＤＭ製のウエザーストリップ２の断面略Ｕ字状のトリム部やオープニングトリムに押出し成形により芯材１が埋設され、その埋設される芯材１は、その溶解度指数（以下ＳＰ値と記す）において、前記ＥＰＤＭのＳＰ値１６（ＭＰａ）^1/2よりも２（ＭＰａ）^1/2以上好ましくは６（ＭＰａ）^1/2以上多い合成樹脂により形成されたものである。
また本発明は、ＥＰＤＭ製のウエザーストリップ２の断面略Ｕ字状のトリム部やオープニングトリムに押出し成形により芯材１が埋設され、その埋設される芯材１は、複数のコア１ａを有し各コア１ａ間に切欠き部１ｂが形成されるとともに、その溶解度指数（以下ＳＰ値と記す）において、前記ＥＰＤＭのＳＰ値１６（ＭＰａ） ^1/2 よりも２（ＭＰａ） ^1/2 以上好ましくは６（ＭＰａ） ^1/2 以上多い合成樹脂により形成され、前記芯材１の切欠き部１ｂに当たる部分に生じる窪み３を縮小させるようにしたものである。
また、芯材４が、ＳＰ値において前記ＥＰＤＭのＳＰ値１６（ＭＰａ）^1/2よりも２（ＭＰａ）^1/2以上好ましくは６（ＭＰａ）^1/2以上多いポリアミド（ナイロン）樹脂により形成されたものである。 In order to achieve such an object, as shown in FIGS. 1 and 2, in the present invention, a core material 1 is embedded in a trim portion or an opening trim of a weather strip 2 made of EPDM by extrusion molding, core 1 is embedded in its solubility parameter (hereinafter referred to as SP value), the 2 than the SP value 16 (MPa) ^1/2 of EPDM (MPa) ^1/2 or more preferably 6 (MPa) ^{1 /} It is formed from ^two or more synthetic resins.
Further, in the present invention, a core material 1 is embedded by extrusion molding in a trim portion or opening trim of a weather strip 2 made of EPDM, and the embedded core material 1 has a plurality of cores 1a. Notches 1b are formed between the cores 1a, and the solubility index (hereinafter referred to as SP value) is preferably 2 (MPa) ^1/2 or more than the SP value 16 (MPa) ^{1/2 of the} EPDM. Is formed of 6 (MPa) ^1/2 or more of synthetic resin, and is configured to reduce the recess 3 generated in the portion corresponding to the notch 1b of the core material 1.
The formation, the core 4, by the SP value of the ^{EPDM 16 (MPa) 1/2 2 (} MPa) 1/2 or more preferably above 6 (MPa) ^1/2 or more often polyamide (nylon) resin in SP value It has been done.

The invention's effect

本発明の自動車用ウエザーストリップは、埋設される芯材１、４がＳＰ値をＥＰＤＭのＳＰ値１６（ＭＰａ）^１／２よりも２（ＭＰａ）^１／２以上好ましくは６（ＭＰａ）^１／２以上多い樹脂により形成されているため、従来のように加硫時にＥＰＤＭ製のウエザーストリップ２との間に融着を起こさず追従性並びに可撓性を向上すると共に、組み付け後コア１ａ間の窪み３が小さくなり外観も向上するという特長がある。Automotive weather strip of the present invention, the SP value of the core member 1 and 4 SP value embedded EPDM 16 ^{(MPa) 1/2} 2 than ^{(MPa) 1/2} or more preferably 6 ^{(MPa) 1 / Since} it is formed of ^two or more resins, it does not cause fusion with the EPDM weather strip 2 during vulcanization as in the prior art, and improves followability and flexibility, and between the cores 1a after assembly. There is a feature that the hollow 3 is reduced and the appearance is improved.

以下、本発明の実施例を図に基づいて詳細に説明する。図１及び図２において、１はＥＰＤＭ製のウエザーストリップ２に押出し成形により埋設される芯材で、このＳＰ値が、ＥＰＤＭのＳＰ値１６（ＭＰａ）^１／２よりも所定値多い即ち２（ＭＰａ）^１／２以上好ましくは６（ＭＰａ）^１／２以上多い合成樹脂により形成されたものである。
つまり、芯材１のＳＰ値が、これを被覆する前記ＥＰＤＭ製のウエザーストリップ２のＳＰ値１６（ＭＰａ）^１／２よりも前記所定値以上離れた即ちＥＰＤＭとの相溶性少なくさせた材質の芯材１を用いることで、ＥＰＤＭ製のウエザーストリップ２との間に融着を起き難くしたものである。
従って、押出し成形後、前記断面略Ｕ字状のトリム部やオープニングトリムにおいて、芯材１はウエザーストリップ２との融着が強くないため、従来と異なり前記ドアや開口縁部の湾曲部への組み付け時の追従性が良くなる。また、組み付け後前記窪み３が狭まり外観が向上する。Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2, reference numeral 1 denotes a core material embedded in an EPDM weather strip 2 by extrusion molding. This SP value is a predetermined value greater than the SP value 16 (MPa) ^{1/2 of the} EPDM, that is, 2 ( ^{MPa) 1/2} or more preferably one formed by many synthetic resin 6 ^{(MPa) 1/2} or more.
That is, the SP value of the core material 1 is more than the SP value 16 (MPa) ^{1/2 of the} EPDM weather strip 2 that covers the core material 1, and is made of a material that is less compatible with EPDM. By using the core material 1, it is difficult to cause fusion with the weather strip 2 made of EPDM.
Therefore, after the extrusion molding, in the trim part or the opening trim having the substantially U-shaped cross section, the core material 1 is not strongly bonded to the weather strip 2, and unlike the conventional case, the door 1 and the opening edge are bent to the curved part. Followability during assembly is improved. Moreover, the said hollow 3 narrows after an assembly | attachment and an external appearance improves.

他の実施例として、芯材４は、ＳＰ値においてＥＰＤＭのＳＰ値１６（ＭＰａ）^１／２よりも２（ＭＰａ）^１／２以上好ましくは６（ＭＰａ）^１／２以上多いポリアミド（ナイロン）樹脂により形成されたものである。この芯材４の作用効果は前記実施例と同様である。
次に、芯材のＳＰ値による融着の有無や芯材コア間の跡（窪み）について

に示す。As another example, the core material 4 is a polyamide (nylon) having an SP value that is 2 (MPa) ^1/2 or more, preferably 6 (MPa) ^1/2 or more than the SP value 16 (MPa) ^1/2 of EPDM. It is made of resin. The effect of this core material 4 is the same as that of the said Example.
Next, the presence or absence of fusing by the SP value of the core material and the traces (dents) between the core material cores

Shown in

本発明の自動車用ウエザーストリップにおける芯材の平面図である。 It is a top view of the core material in the weather strip for motor vehicles of this invention. 同上のＡ−Ａ線に沿う断面図である。 It is sectional drawing which follows the AA line same as the above. 自動車の側面図である。 It is a side view of a motor vehicle. 同上のＢ−Ｂ断面図である。 It is BB sectional drawing same as the above.

Explanation of symbols

１芯材
１ａコア間
１ｂ切欠き部
２ウエザーストリップ
３窪み
４芯材DESCRIPTION OF SYMBOLS 1 Core material 1a Between cores 1b Notch 2 Weather strip 3 Indentation 4 Core material

Claims

A core material 1 is embedded by extrusion molding in a substantially U-shaped trim part or opening trim of a weather strip 2 made of EPDM , and the embedded core material 1 has a solubility index (hereinafter referred to as SP value): A weather strip for automobiles, characterized in that it is formed of a synthetic resin that is 2 (MPa) ^1/2 or more, preferably 6 (MPa) ^1/2 or more, more than the SP value 16 (MPa) ^{1/2 of the} EPDM.

A core material 1 is embedded by extrusion molding in a substantially U-shaped trim part or an opening trim of a weather strip 2 made of EPDM, and the core material 1 to be embedded has a plurality of cores 1a and between the cores 1a. Notch portion 1b is formed, and in its solubility index (hereinafter referred to as SP value), the SP value of EPDM is 16 (MPa). ^1/21/2 Than 2 (MPa) ^1/21/2 Or more, preferably 6 (MPa) ^1/21/2 A weather strip for automobiles, characterized in that it is formed of a large amount of synthetic resin, and the depression 3 formed in the portion corresponding to the notch 1b of the core material 1 is reduced.

Core 4, automobile weather strip according to claim 1 or 2, characterized in that it is formed by a polyamide (nylon) resin.