JP4350794B1 - ゴム芯入り組紐の接合方法 - Google Patents
ゴム芯入り組紐の接合方法 Download PDFInfo
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B—PERFORMING OPERATIONS; TRANSPORTING
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Abstract
【解決手段】一対の型板21、22からなり、両型板の内面に開設した溝部23、24が両型板を閉じることによって、ゴム芯入り組紐1が緊密に嵌まる貫通孔25を形成す2つ割り式の金型(2)を用い、一方の型板21の溝部23に、ゴム芯入り組紐1の端部11を嵌め、該ゴム芯入り組紐(1)の他方の端部12或いは別個のゴム紐の端部12を該溝部23に嵌めてゴム芯入り組紐の両端部11、12どうしを接近させると共に、両端部11、12間に熱可塑性樹脂3を介在させ、金型2を閉じた状態で熱可塑性樹脂3を加熱溶融させて、ゴム芯入り組紐1の端部11、12に溶融樹脂を浸透固化させて、ゴム芯入り組紐1の端部11、12どうしを接合する。
【選択図】図1
Description
しかし、ゴム芯入り組紐の切断面は、ゴム芯にテンションを掛けた状態で被覆組紐が形成されていることから、ゴム芯の端面は凹み気味となり、被覆組紐の端面は毛羽立ちによって外側に膨らみ気味となる。この様にゴム芯入り組紐の切断端面が平坦に揃わないことに起因して、接着剤では十分な接着力が得られない問題がある。
又、シアノアクリレート系接着剤による接合部は、アセトンによって容易に溶解され、接合が外れる。又、シアノアクリレート系接着剤は耐水性能が低いため、接合部を水に浸けると接着強度が劣化する。
本発明は、上記問題を解決できる、ゴム芯入り組紐の接合方法を明らかにするものである。
一方の型板(21)の溝部(23)に、ゴム芯入り組紐(1)の端部(11)を嵌め、該ゴム芯入り組紐(1)の他方の端部(12)或いは別個のゴム紐の端部(12)を該溝部(23)に嵌めてゴム芯入り組紐の両端部(11)(12)どうしを接近させると共に、両端部(11)(12)間に熱可塑性樹脂(3)又は前記混合物を介在させ、
金型(2)を閉じた状態で熱可塑性樹脂(3)又は前記混合物中の熱可塑性樹脂を加熱溶融させて、ゴム芯入り組紐(1)の端部(11)(12)に溶融樹脂を浸透固化させて、ゴム芯入り組紐(1)の端部(11)(12)どうしを接合する。
該金型(2)の貫通孔(25)の下端からゴム芯入り組紐(1)の端部(11)を貫通孔(25)の途中まで挿入し、貫通孔(25)の上端から熱可塑性樹脂(3)又は前記混合物を投入し、更に貫通孔(25)の上端から該ゴム芯入り組紐(1)の他端部(12)或いは別個のゴム紐の端部(12)を該貫通孔(25)に挿入してゴム芯入り組紐(1)の端部(11)(12)どうし接近させると共に、前記熱可塑性樹脂(3)又は前記混合物中の熱可塑性樹脂を加熱溶融させ、ゴム芯入り組紐(1)の端部(11)(12)に溶融樹脂(3)を浸透固化させて、ゴム芯入り組紐(1)の端部(11)(12)どうしを接合する。
又、金型(2)を開いて、接合部を含むゴム芯入り組紐(1)を取り出すことができるから、1本のゴム芯入り組紐(1)の両端部を接合して、リング体のゴム芯入り組紐を形成できる。
又、金型(2)の貫通孔(25)に下方からゴム芯入り組紐(1)を挿入して孔底を塞ぎ、貫通孔(25)の上から、所定量の熱可塑性樹脂(3)又は前記混合物を投入するから、それらが不必要な部分に零れたり、はみ出して不都合を来すことを防止できる。
しかし、この場合、熱可塑性樹脂(3)が粉末状、顆粒状である場合、熱可塑性樹脂が溝部(23)から溢れて溝部(23)からはみ出してしまい、或いは前記混合物が溝部(23)からはみ出して、金型(2)の型締めに不都合を生じたり、完成製品の接合部に、型締めの隙間がバリとして残り、商品価値を損なう虞れがある。
請求項4では、金型(2)を閉じてその貫通孔(25)に熱可塑性樹脂(3)又は熱可塑性樹脂と接着剤の混合物を投入するから、金型(2)の型締めに支障となる部分に熱可塑性樹脂(3)又は前記混合物が供給されることを防止でき、上記問題は生じない。
又、被覆組紐を溶融させて該ゴム芯入り組紐を接合するから、ゴム芯入り組紐の素材に適した接着剤或いは熱可塑性樹脂を選択する手間も不要である。
上下に分割可能な2つ割りの金型(2)を用いて、該金型でゴム芯入り組紐(1)の端部どうしを接合する。
金型(2)は、ゴム芯入り組紐(1)を接合するための後記する熱可塑性樹脂(3)又は熱可塑性樹脂と接着剤の混合物中の熱可塑性樹脂の加熱溶融と、接合部の外形を決める役割を成す。
金型(2)は、2つの扁平直方体の型板(21)(22)からなり、両型板(21)(22)の対向面に、断面半円の直線溝部(23)(24)が開設されている。
両型板(21)(22)には、溝部(23)(24)の中央部を、後記する熱可塑性樹脂(3)の融点以上に、加熱するヒータ(図示せず)が内蔵されている。
型板(21)(22)の素材は、熱伝導性に優れたものが望ましいのは勿論である。
実施例では、被覆組紐の素材はナイロン等の合成樹脂である。
尚、本発明は、1本のゴム芯入り組紐(1)の両端部(11)(12)を接合してリング体を形成することも、2本のゴム芯入り組紐の端部(11)(12)どうしを接合して1本に繋ぎ合わせる場合にも実施できるのは勿論である。
開き状態の開閉片(41)(41)間に、半円溝(42)の位置に対応してゴム芯入り組紐(1)を挿入し、開閉片(41)(41)を閉じると、ゴム芯入り組紐(1)は前記貫通孔(43)の内面で加圧され、ゴム芯入り組紐(1)を少々引っ張っても、貫通孔(43)から滑って抜け出すことはない。
実施例では、熱可塑性樹脂(3)は溶融し易い様に粉末状としたが、顆粒状、ペレット状、小板片状でもよい。
熱可塑性樹脂(3)の量は、熱可塑性樹脂(3)が溶融してゴム芯入り組紐(1)の両端部(11)(12)に浸透するに必要にして十分な量であり、溶融樹脂が固化しても目立たない量とする。
熱可塑性樹脂(3)が多すぎると、ゴム芯入り組紐(1)の接合部が目立ち、又、接合部が硬く成り過ぎる。
図2に示す如く、金型(2)を閉じ、ゴム芯入り組紐(1)の端部(11)(12)を互いに接近する方向に押し込みつつ、熱可塑性樹脂(3)を加熱溶融させる。
上記作業に際して、ゴム芯入り組紐(1)の端部(11)(12)を挟み具(4)(4)で挟んで行うと作業性に優れ、又、安全でもある。
金型(2)を開いて、ゴム芯入り組紐(1)を取り出し、接合部の樹脂を完全に固化させると、ゴム芯入り組紐(1)の端部(11)(12)の接合を完了する。
前記2つ割金型(2)をその貫通孔(25)が縦向となる様にして用いる。
金型(2)の貫通孔(25)に、下方から該孔の途中までゴム芯入り組紐(1)の端部(11)を挿入する。少し抵抗があるが、ゴム芯入り組紐(1)を挟み具(4)で挟んで押し込むことによって容易に行なうことができる。
ゴム芯入り組紐(1)の端部(11)(12)を互いに接近する方向に押し込みつつ、熱可塑性樹脂(3)を加熱溶融させる。
金型(2)を開いて、ゴム芯入り組紐(1)を取り出し、接合部の樹脂を完全に固化させると、ゴム芯入り組紐(1)の端部(11)(12)の接合を完了する。
上記第1、第2実施例において、熱可塑性樹脂(3)に代えて、接着剤と熱可塑性樹脂の混合物を用いる。
前記加熱工程で、混合物中の熱可塑性樹脂が端部(11)(12)に溶融浸透して、強力に接合できる。
尚、実施例ではシアノアクリレート系瞬間接着20gに対して熱可塑性樹脂の粉末5gを混ぜて厚み0.5〜0.7mmの板状に固化させ、これを接合すべきゴム芯入り組紐の外径に対応する小円板状に打ち抜いたものを、ゴム芯入り組紐(1)の端部(11)(12)間に1個挟み込んで前記実施例の手順で接合した。
接着剤と熱可塑性樹脂の混合物が小板状であれば、粉末体や顆粒体よりも扱いが楽であり、又、金型(2)内でゴム芯入り組紐(1)の端部(11)(12)に介在させる作業も簡単であり、型からはみ出すことも防止できる。
前記混合物がゴム芯入り組紐の太さに対応する円板状であるから、金型(2)の型締めに支障となる部分に前記混合物が供給されることを防止でき、しかもゴム芯入り組紐の接合端面全体に均一に混合物、接着剤を行き渡らせることができる。
上記第3実施例において、接着剤と熱可塑性樹脂の混合物に代えて、熱可塑性樹脂のみを用いる。第3実施例と同様の効果を奏する。
熱可塑性樹脂(3)又は接着剤と熱可塑性樹脂の混合物を省略し、ゴム芯入り組紐(1)の端部(11)(12)どうしを直接に突き合わせた状態で被覆組紐の端部を加熱溶融して、該溶融樹脂をゴム芯入り組紐(1)の端部(11)(12)に浸透固化せしめて、ゴム芯入り組紐(1)の端部(11)(12)どおしを接合する。
被覆組紐を加熱溶融する際に、両端部(11)(12)を互いに接近する方向を押圧しておくことが望ましい。
被覆組紐の素材がナイロンの場合、加熱温度は180℃程度でよい。
11 端部
12 端部
2 金型
25 貫通孔
3 熱可塑性樹脂
Claims (8)
- ゴム芯入り組紐(1)の端部(11)(12)どうしを接近して対向させると共に、両端部(11)(12)間に熱可塑性樹脂(3)又は熱可塑性樹脂と接着剤の混合物を介在させ、ゴム芯入り組紐の端部(11)(12)間に跨ってゴム芯入り組紐(1)の断面輪郭に対応する周壁(25a)で包囲した状態にて、熱可塑性樹脂(3)又は前記混合物中の熱可塑性樹脂を加熱溶融して、ゴム芯入り組紐(1)の端部に溶融樹脂を浸透固化させて、ゴム芯入り組紐(1)の端部(11)(12)どうしを接合する、ゴム芯入り組紐の接合方法。
- 金型(2)に開設されゴム芯入り組紐(1)が緊密に嵌まる貫通孔(25)にゴム芯入り組紐の両端(11)(12)と熱可塑性樹脂(3)又は前記混合物を封じ込めて行う、請求項1に記載のゴム芯入り組紐の接合方法。
- 一対の型板(21)(22)からなり、両型板(21)(22)を閉じることによって、両型板(21)(22)の内面に開設した溝部(23)(24)が、ゴム芯入り組紐(1)が緊密に嵌まる貫通孔(25)を形成する金型(2)を用い、
一方の型板(21)の溝部(23)に、ゴム芯入り組紐(1)の端部(11)を嵌め、該ゴム芯入り組紐(1)の他方の端部(12)或いは別個のゴム紐の端部(12)を該溝部(23)に嵌めてゴム芯入り組紐の両端部(11)(12)どうしを接近させると共に、両端部(11)(12)間に熱可塑性樹脂(3)又は熱可塑性樹脂と接着剤の混合物を介在させ、
金型(2)を閉じた状態で熱可塑性樹脂(3)又は前記混合物中の熱可塑性樹脂を加熱溶融させて、ゴム芯入り組紐(1)の端部(11)(12)に溶融樹脂を浸透固化させて、ゴム芯入り組紐(1)の端部(11)(12)どうしを接合する、ゴム芯入り組紐の接合方法。 - 一対の型板(21)(22)からなり、両型板(21)(22)を閉じることによって、両型板の内面に開設した溝部(23)(24)が、ゴム芯入り組紐(1)が緊密に嵌まる貫通孔(25)を形成する金型(2)を、該貫通孔(25)が縦向きとなる様にセットし、
該金型(2)の貫通孔(25)の下端からゴム芯入り組紐(1)の端部(11)を貫通孔(25)の途中まで挿入し、貫通孔(25)の上端から熱可塑性樹脂(3)又は熱可塑性樹脂と接着剤の混合物を投入し、更に貫通孔(25)の上端から該ゴム芯入り組紐(1)の他端部(12)或いは別個のゴム紐の端部(12)を該貫通孔(25)に挿入してゴム芯入り組紐(1)の端部(11)(12)どうし接近させると共に、前記熱可塑性樹脂(3)又は前記混合物中の熱可塑性樹脂を加熱溶融させ、ゴム芯入り組紐(1)の端部(11)(12)に溶融樹脂(3)を浸透固化させて、ゴム芯入り組紐(1)の端部(11)(12)どうしを接合する、ゴム芯入り組紐の接合方法。 - ゴム芯入り組紐(1)の端部(11)(12)どうしを相対的に接近する方向に押圧した状態で、熱可塑性樹脂(3)又は前記混合物中の熱可塑性樹脂を加熱溶融してゴム芯入り組紐(1)の端部(11)(12)どうしを接合する、請求項1乃至4の何れかに記載のゴム芯入り組紐。
- 熱可塑性樹脂(3)、又は熱可塑性樹脂と接着剤の混合物は、粉末状、顆粒状、ペレット状、小板片の何れかの形態をなしている、請求項1乃至5の何れかに記載のゴム芯入り組紐の接合方法。
- 熱可塑性樹脂(3)、又は熱可塑性樹脂と接着剤の混合物は、ゴム芯入り組紐の太さに対
応する円板状に形成されている、請求項1乃至5の何れか記載のゴム芯入り組紐の接合方
法。 - ゴム芯を樹脂製の被覆組紐で被覆したゴム芯入り組紐(1)の端部(11)(12)を突き合わせ、ゴム芯入り組紐の端部(11)(12)間に跨ってゴム芯入り組紐(1)の断面輪郭に対応する周壁(25a)で包囲した状態にて、該突合せ部を加熱して被覆組紐を溶融し、ゴム芯入り組紐(1)の端部(11)(12)に溶融樹脂を浸透固化させて、ゴム芯入り組紐(1)の端部(11)(12)どうしを接合する、ゴム芯入り組紐の接合方法。
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