JP2005040173A

JP2005040173A - Elastic band and method for bonding the same

Info

Publication number: JP2005040173A
Application number: JP2003200179A
Authority: JP
Inventors: Takesaburo Otani; 武三郎大谷
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-07-23
Filing date: 2003-07-23
Publication date: 2005-02-17
Anticipated expiration: 2023-07-23
Also published as: JP3560602B1

Abstract

<P>PROBLEM TO BE SOLVED: To increase adhesive bonding force at an adhesive bonded part when a ring-shaped band is formed by adhesively bonding both ends of a rubber core string. <P>SOLUTION: A method for manufacturing an elastic band includes the following processes. In a process, a solidification agent containing a swelling agent such as yeast powder is applied to both end surfaces of a string material 1b. The end parts of the rubber core 2 and the end parts of an elastic cover 3 are solidified integrally, and the solidified part is made porous by a gas generated by the swelling agent. In the next process, the rubber core containing string 1 of a length corresponding to a length of the expanded ring-shaped band is obtained by cutting the solidified parts 10, 10 at both ends of the string material 1b smoothly. In the last process, both cutting end surfaces of the rubber core containing string 1 are abutted through an adhesive agent 5. Consequently, the adhesive agent enters minute openings on the end surfaces of the rubber core and joins the rubber core containing string 1 firmly. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する分野】
本発明は、頭髪の纏め具、物品に対する留め具、腕などにつける装飾品として使用される伸縮性バンド、その製造方法及びバンドを接着接合するための前処理用固化剤に関する。
【０００２】
【従来の技術および解決しようとする課題】
ゴム芯と該ゴム芯を覆う伸縮性カバーとによって構成される所定長さのゴム芯入り紐を、その両端を接着接合することによって形成されたリング状の伸縮性バンドが実用されている。
ゴム芯入り紐の両端を接着接合する際に問題となるのは、ゴム芯入り紐の端部において、伸縮性カバーの端面は毛羽立ち、ゴム芯の端面はゴムの収縮によって凹みがちとなり、ゴム芯入り紐の端面が平坦にならないことである。接着接合すべき端面が平坦でないと、相手端面に対する密着度が小さくなって、接着剤の利きが悪く、接合力が弱まる。
そこで、ゴム芯入り紐の端部を予め接着剤で固めておく（特許文献１）、又は、長寸のゴム芯入り紐（１）の切断予定部を冷却して固めておく（特許文献２）ことにより、接着接合すべき切断端面を平坦にすることが提案されている。
【０００３】
特許文献１は、ゴム芯入り紐全体を、水溶性接着剤（実施例ではポリビニ−ルアルコ−ル３％の水溶液）に浸し、乾燥させて伸縮性カバーとゴム芯とを密着させる工程と、該ゴム芯入り紐を所望の長さに切断し、切断端面どうしを非水溶性接着剤で接着してリング状に繋ぐ工程と、できあがったリング状バンドの表面に、乾燥により白く変色して残存する水溶性接着剤を除去する工程とからなる。
出願人が特許文献１の実施を試みたところ、以下の問題点のあることが分かった。
１．水溶性接着剤が、ゴム芯入り紐のカバーを形成する繊維の隙間や、カバーとゴム芯との間の隙間に入り込み、後から塗布する非水溶性の接着剤の浸透を妨げるから、ゴム芯の先端面どうしだけの接着となる。そのため伸縮性バンドの接合部の強度が弱く、バンドを引張ったときに切れ易い。水溶性接着剤の濃度が高くなればなるほど、この傾向が強い。
リング状バンドに荷重を掛けて接着接合部の引張り強度試験を行なった結果、１００本中、最高値は２．３ｋｇで、半数以上は５００ｇの引張力にも耐えられず破断した（試験方法は後記実施例中に記載）。
又、伸縮性カバーの繊維量が多い場合、水溶性接着剤では繊維が上手くまとまらず、ゴム芯入り紐の端部の繊維どうしの接着が効き難く、且つ接着部が膨らんで美観が悪く、商品価値を損なう。
２．ゴム芯入り紐全体を水溶性接着剤に漬けているので、乾燥して粉状となった水溶性接着剤がカバーの繊維間やカバーとゴム芯との間に潜り込んだ状態で、ゴム芯入り紐の全長に亘って残存する。このため、粉状接着剤を洗浄除去するには手間が掛かる。
粉状となった水溶性接着剤の除去工程を省略した場合、リング状バンドを使用する毎に、粉状接着剤が繊維の中からでてくる。このため洗浄工程は非可欠である。ゴム紐の種類によっては、洗浄の結果、著しく風合いを損ねることがあり、接着可能なゴム芯入り紐の種類は限定される。
【０００４】
特許文献２は、長尺ゴム芯入り紐を部分的に冷却固化剤によって固化させる工程、固化部分を切断する工程、切断端部が非固化状態に戻った状態で該端部に油分の除去等のために前処理剤を塗布する工程、ゴム芯入り紐の両端を接着剤で接着する工程とからなる。
出願人が文献２の実施を試みたところ、以下の問題点のあることが分かった。
１．冷却固化剤として挙げられている液体窒素を、ゴム芯入り紐に噴射すると、作業所の室内環境の窒素濃度が上がる。機械化が困難なため、現状では室内で手作業で行なっているゴム紐の接着作業に、液体窒素ガスを用いることは人体に危険である。
２．液体窒素の貯蔵時の温度は−１９０℃であるが、これを噴霧すると−８０℃〜−７０℃に上がる。従って、液体窒素の噴霧でゴム芯入り紐の表面を冷却しても、該紐の表面の繊維だけが冷却されるだけで、ゴム芯までを固化させるには至らない。
−１９０℃の液体窒素にゴム芯入り紐を浸けることを試みたところ、ゴム芯入り紐全体を冷却固化できたが、固化部が硬くなり過ぎて、通常の切断具では切断できなかった。
３．ゴム芯入り紐の切断端部が非固化状態に戻ると、切断部の繊維がほどけて拡がり、ゴム芯の端面に被さってしまう。従って、前処理剤や接着剤をゴム芯の端面に上手く塗布することが難しい。ゴム芯の端面どうしを完全に突き合わせて接着することもできない。これでは、ゴム芯入り紐の端部を冷却固化することは無意味である。
【０００５】
出願人は、上記の点に鑑み、ゴム芯入り紐の接着接合部の引張強度向上のために研究努力を重ねた結果、従来の問題を解決して、接着接合部の引張強度を飛躍的に向上できる伸縮性バンド、その製造方法及びバンドを接着接合するための前処理用固化剤を完成したものである。
【０００６】
【特許文献１】
特許第３０９１８３２号公報
【特許文献２】
特開２００２ー２４０１５４号公報
【０００７】
【課題を解決するための手段】
本発明の固化剤は、ゴム芯（２）と、該ゴム芯を覆う伸縮性カバー（３）とによって構成されるゴム芯入り紐（１）の端面を接着接合する際に、ゴム芯入り紐（１）の端部を固化させるための水溶性の固化剤であって、該固化剤は膨張剤を含むことを特徴とする。
【０００８】
本発明の伸縮性バンドの製法は、ゴム芯入りの材料紐（１ｂ）の両端部に前記固化剤を塗布し、ゴム芯（２）の端部と伸縮性カバー（３）の端部を一体に固めると共に膨張剤の働きによって固化部分を多孔質にする工程、
材料紐（１ｂ）の両端の固化部分（１０）（１０）を切断して、リング状バンドの展開長さに対応する長さのゴム芯入り紐（１）を得る工程、
ゴム芯入り紐（１）の両切断端面を、接着剤（５）を介して突き合せて接着し、ゴム芯入り紐（１）をリング状に繋ぐ工程を含む。
【０００９】
【作用及び効果】
材料紐（１ｂ）の端部に固化剤を塗布すると、固化剤は、伸縮性カバー（３）の内部、伸縮性カバー（３）とゴム芯（２）との間隙に侵入する。固化剤によって固まった材料紐（１ｂ）の端部を切断してゴム芯入り紐（１）を得るため、ゴム芯入り紐（１）の切断端面に伸縮性カバー（３）の毛羽立ちは生じず、又、紐（３）とゴム芯（２）の材質の違いに関わらず、平坦な切断端面を得ることができる。
固化剤を、材料紐（１ｂ）の端面に直接に塗布するため、ゴム芯（２）の端面と伸縮性カバー（３）の端面を確実に一体に固めることができる。
又、上記ゴム芯入り紐（１）の平坦な切断面どうしを接着剤を介して突き合わせて接着するため、接着力を向上させることができる。
【００１０】
本発明の場合、接合部の接着強さは、従来の接着方法より５倍程度も優れていることが実験で確かめられた。
出願人は、この理由について、ゴム芯（２）の端面にも接着剤が食い込んで固まり、機械的結合力が高まるからであると考えている。
周知の如く、ゴムは微細な孔を多数有する多孔質体である。
材料紐（１ｂ）の端部に固化剤を塗布したとき、水溶性の固化剤はゴム芯（２）の端部からゴム材料の微細な孔に浸透する。固化剤が乾燥すると材料紐（１ｂ）の端部においてゴム芯（２）と伸縮性カバー（３）は一体に固まる。固化剤中の水分や揮発性成分は、蒸発或いは気化する。乾燥した固化剤には、それら蒸発や気化によって多数の微細な孔（４１）が残って多孔質となる。又、膨張剤のガス発生作用によりガスが発生し、前記多孔質化した固化剤（４）の孔（４１）を膨張させる。
材料紐（１ｂ）の両端固化部を、固化部の範囲内で夫々切断して、ゴム芯入り紐（１）を得ると、ゴム芯入り紐（１）の端部には、この膨張した孔（４１）の一部が残存する。接着剤（５）を介して切断面どうしを突き合わせると、この孔（４１）に接着剤（５）が浸透して固化し、これが機械的結合の働きを成して、リング状バンドの接着接合部の引張強度を大幅に向上出来たと考えられる。
図７に示す如く、ゴム芯入り紐の接合部を拡大して見ると、接着剤の一部が、ゴム芯の端面から内部に食い込んで固化して状態を確認できた。
【００１１】
【実施例】
実施例１
図１は、本発明の方法によって形成した伸縮性リング状バンドを示しており、ゴム芯（２）と該ゴム芯を覆う伸縮性カバー（３）とからなるゴム芯入り紐（１）の両端を突き合わせて接着して形成されている。リング状バンドの接着接合部（１１）は、外観からは殆んど分からない。バンドを触ると、１箇所だけ硬い部分があり、これが接着接合部であると分かる程度である。
【００１２】
図２は、上記リング状バンドの製造工程を示している。
図２（ａ）は、リング状バンドの材料であるゴム芯入り長尺紐（１ａ）を示している。
ゴム芯（２）の断面は、１辺が２．５ｍｍの正方形であるが、伸縮性カバー（３）に覆われているため変形しており、長尺紐（１ａ）の端面は直径４．５ｍｍの略円形を呈している。
伸縮性カバー（３）は、綿糸、合成繊維糸等の繊維糸を編む、織る或いは組紐にして、ゴム芯（２）の伸縮に対応できる様に、長尺紐（１ａ）の長さ方向に伸縮可能に形成されている。
【００１３】
図２（ｂ）に示す如く、上記長尺紐（１ａ）を、リング状バンドの展開長さＬよりも少し長い長さＬ１に切断して材料紐（１ｂ）を得る。
材料紐（１ｂ）をリング状バンドの展開長さより少し長くしたのは、後記工程で、材料紐（１ｂ）の両端を少し切り落としてリング状バンドの展開長さに対応させるためである。
実施例では、リング状バンドの展開長さＬは１５０ｍｍ、材料紐（１ｂ）の長さは１５５ｍｍとし、切り落とし代は、夫々２．５ｍｍである。
【００１４】
図２（ｃ）に示す如く、材料紐（１ｂ）の両端面に固化剤（４）を塗布して、該端部のゴム芯（２）と伸縮性カバー（３）を一体に固める。
固化剤（４）は本発明のために開発したものであって、図５に示す如く、固化剤（４）が乾燥する際に形成される多数の微細な孔（４１）（４１）を拡大させる孔拡大成分を含むことを特徴とする。
実施例の固化剤は、水と混合して用いられゴム芯入り紐（１）のゴム芯（２）と伸縮性カバー（３）とを一体に固める働きを成す固化作用成分と、水と、孔拡大成分である膨張剤を含む。
固化作用成分としてポリビニールアルコール系糊（日本合成産業株式会社製）６０ｃｃ、膨張剤として炭酸水素ナトリウム０．５ｇを用い、これらを４０ｃｃの水に溶かして固化剤とした。
実施例では固化剤を容れた容器に、材料紐（１ｂ）の先端を１ｃｍ程度浸けて、塗布斑が生じない様に固化剤（４）を塗布した。図４に示す如く、固化剤（４）は、伸縮性カバー（３）とゴム芯（２）との間、伸縮性カバー（３）の繊維及びゴム芯（２）の微細な孔にも浸透する。
【００１５】
固化剤付着部に温風を当てて固化剤（４）を強制乾燥させる。これは、固化剤（４）の乾燥時間を短縮すると共に、固化剤（４）に含まれる膨張剤の反応を促進させるためである。温風の温度は５０℃、加熱時間は１０分間である。実際には、多数本のゴム芯入り紐（１）を、固化剤どうしが接触しない様に乾燥用箱に収容し、該箱に温風を供給して乾燥させた。ゴム芯入り紐（１）の温度は７０℃に達した。
固化剤（４）の乾燥中に、固化剤中の水分や揮発性成分は、蒸発或いは気化し、乾燥した固化剤には、それら蒸発や気化によって多数の微細な孔（４１）（４１）が残り、多孔質となる。
炭酸水素ナトリウムは６５℃以上で分解するので、上記加熱乾燥工程中に、炭酸ガスが発生する。このガスは、図６に示す如く、上記多孔質化した固化剤（４）の孔（４１）（４１）を膨張させて、該孔を拡大させる。
【００１６】
図２（ｄ）に示す如く、材料紐（１ｂ）の両端の固化部分（１０）（１０）を、材料紐（１ｂ）の長さ方向と直交して切断し、リング状バンドの展開長さＬに対応する長さのゴム芯入り紐（１）を得る。
ゴム芯（２）と伸縮性カバー（３）が一体に固まっている部分（１０）を切断するため、切端面に伸縮性カバー（３）に毛羽立ちは生じず、又、紐（３）とゴム芯（２）の材質の違いがあるにも拘わらず、切り口は平坦である。
【００１７】
ゴム芯入り紐（１）の一方の端面に非水溶性の接着剤（５）を塗布し、両端面をその中心を一致させて突き合わせ、突き合わせ方向に加圧して接着接合する。
伸縮性カバー（３）、該カバー（３）とゴム芯（２）との間の隙間及びゴム芯（２）の端緬に浸透して乾燥し、且つ多孔質となった固化剤（４）の拡大孔（４１）（４１）に接着剤（５）が浸透して固化する。この孔（４１）に浸透して固化した接着剤が、ゴム芯入り紐（１）の端面どうしを機械的に結合する役割をなして、強力な接合力を得ることができる。
ゴム芯入り紐（１）の接着接合の外周部に段差が生じておらず、又、接着剤が固化剤の孔（４１）に浸透して接合部の外周側にはみ出すことが防止されるため、接着接合部に膨らみは生じず、他の部分と区別出来ないほど綺麗な外観の接着接合ととなる。
【００１８】
実施例では、接着剤は、浸透性を有し、速乾性であるシアノアクリレート系接着剤（商品名「シアノボンドＲＰ−ＬＸ」田岡化学工業株式会社製）を用いた。
ゴム芯入り紐（１）の一方の端面のみに接着剤を塗布したのは、それで十分に満足できる接着力を得ることができるからである。
ゴム芯入り紐（１）の両端面に接着剤（５）を塗布した場合、塗布に時間差が生じることによって、先に接着剤を塗布した方の端面は、その接着剤が乾いた状態で、相手端面の接着剤と接するために、接着力が低下する虞れがある。
【００１９】
更に、必要量以上の接着剤を塗布すると、接着剤が端面外周部へ押し出されて固化し、接着接合部の外周からバリとなって突出し、美観を損なう。
又、リング状バンドを頭髪に使用した場合、該バリが髪に引っ掛かってしまう。接着剤が固化して生じたバリを、後工程で綺麗に除去することは極めて手間が掛かり、コスト高を招来する。
尚、ゴム芯入り紐（１）の端面に、接着剤（５）を塗布するには、該端面を上向きにして、接着剤を該端面に滴下すれば可い。接着剤は、表面張力によって端面の外へ流れ落ちることはなく、内部に浸透する。
【００２０】
上記工程で形成されたリング状バンドは、接着接合部の固化剤（４）の孔（４１）に接着剤（５）が浸透して固まっており、固化剤が粉末となって外部に逃げ出せる量は微量であるが、接着接合部付近には、伸縮性カバー（３）の表面に、乾燥して固化剤が白ぽく変色して残存する。ゴム芯入り紐（１）の伸縮性カバー（３）の色によっては、固化剤の残存が、バンドが汚れている様に見えることがある。
その場合、接着接合部（１１）を含むその近傍を水で洗浄して、伸縮性カバー（３）に付着している水溶性固化剤を洗い流せば可い。リング状バンド全体を水洗いする必要はなく、接着接合部だけを洗浄すれば可いから、洗浄の手間は少なくて済む。
水での洗浄であるから、ゴム芯入り紐（１）の端面どうしを接着している非水溶性の接着剤（５）に、接着力の低下等、悪影響を与えることはない。
【００２１】
固化剤の他の実施例
固化剤中の固化作用成分として、ポリビニールアルコール系糊の他に、小麦粉、でんぷん粉、上新粉等を挙げることができる。本発明の場合、固化作用成分は、「水と混合して用いられゴム芯入り紐（１）を固める特性を有する高分子材料」と言い換えることができる。
固化剤に含まれる孔拡大成分である膨張剤の例として、炭酸水素ナトリウムの他に、炭酸水素アンモニウム、塩化アンモニウム、炭酸アンモニウム、酒石酸、酒石酸水素カリウム、焼ミョウバン、イーストパウダー、ベーキングパウダー等を挙げることができる。又、本発明で言う「膨張剤」は、「発泡剤」と言い換えた方が良いものも含む。
又、膨張剤に代えて、上記固化作用成分に対する分解菌又は分解酵素、或いは有機溶剤系洗浄剤を挙げることができる。
上記分解菌や分解酵素が、固化作用成分を分解して固化剤の孔（４１）を拡大する。
分解菌、分解酵素の例として、イースト菌、ビール酵母、麹菌、ポリビニールアルコール分解菌等を挙げることができる。
【００２２】
有機溶剤系洗浄剤は、ゴム芯の端面からゴム内部の微細な孔に浸透して孔を詰まらせている汚れ、油分及び固化作用成分を洗浄剤が除去すると共に、洗浄剤自体は気化して、孔を残す働きがある。
有機溶剤系洗浄剤として、アノン、メタノ−ル、メチルエチルケトン、プロピレンジクロライド、ジクロロメタン、テトラヒドロフラン、トルエン、ｎ−ヘプタン、アセトン等を挙げることができる。
【００２３】
従って固化剤の混合例として次のものを挙げることができる。
（ａ）．炭酸水素ナトリウム＋小麦粉＋水
（ｂ）．炭酸水素ナトリウム＋でんぷん系糊＋水
（ｃ）．炭酸水素ナトリウム＋上新粉＋水
（ｄ）．炭酸水素ナトリウム＋ポリビニールアルコール系糊＋水
（ｅ）．（ａ）〜（ｄ）の炭酸ナトリウムをイースト菌に代えたもの
（ｆ）．（ａ）〜（ｅ）の炭酸水素ナトリウム又はイースト菌を、固化作用成分分解菌又は固化作用成分分解酵素に代えたもの
（ｇ）．（ａ）〜（ｆ）の炭酸水素ナトリウム、イースト菌、固化作用成分分解菌、又は固化作用成分分解酵素を有機溶剤系洗浄剤に代えたもの
上記混合例において、イースト菌を用いた場合、微量の糖分を加えることが望ましい。糖分によってイースト菌の働きが活発になって、固化剤（４）の孔（４１）をより大きくできる。
【００２４】
実施例２
実施例１と固化剤の固化作用成分、配合割合が異なり、その他は実施例１と同じ。
固化剤は、小麦粉２０ｇ、水８０ｃｃ、炭酸水素ナトリウム１ｇを混合したものである。
【００２５】
実施例３
前記実施例１とは、固化剤及び固化剤の乾燥工程が異なり、その他は実施例１と同じ。
固化剤は、小麦粉２０ｇ、水８０ｃｃ、イースト菌１ｇを混合したものである。
材料紐（１ｂ）の端部に固化剤を浸けた後、乾燥させる際、３０℃に達した時点で、約５〜１０分間、その温度を保つ。その間に、イ−スト菌が活性化し、固化剤（４）の孔（４１）を大きくできる。
【００２６】
実施例４
実施例３とは固化剤の配合割合が異なり、その他は実施例３と同じ。
固化剤は、小麦粉２０ｇ、水８０ｃｃ、イースト菌２ｇを混合したものである。
【００２７】
実施例５
有機溶剤系洗浄剤を含む固化剤の例。
固化剤以外は実施例１と同じ。
固化剤は、ポリビニールアルコール系糊４０ｇ、メタノール２０ｃｃ、水４０ｃｃを混合したものである。
【００２８】
実施例６
膨張剤及び有機溶剤系洗浄剤を含む固化剤の例。
固化剤以外は実施例１と同じ。
固化剤は、ポリビニールアルコール系糊４０ｇ、アセトン２０ｃｃ、炭酸水素ナトリウム２ｇを混合したものである。
【００２９】
上記実施例１〜６の製法によるリング状バンドと、前記特許文献１の製法によるリング状バンドの引張強度試験を行なった。
サンプル
サンプル数は各１００本
全てのサンプルは、実施例１のリング状ハンドの太さ、大きさに揃えた。
ゴム芯の材質、太さ、伸縮性カバーの糸の太さ、編み方も同じとした。
試験方法
バネ秤（株式会社中村製作所製・棒状テンションゲ−ジ「ペスツ−ル」最大目盛り１０ｋｇ）のフック部に、リング状バンドを掛け、バンド下端を鉛直下向きに引っ張り、ゴム芯あるいは、伸縮性カバーの少なくとも一方が、破断した時の目盛による。
試験結果

【００３０】
実施例１乃至実施例６の製品の接着接合部の引張強度は、使用したバネ秤の最大目盛り１０ｋｇを越えており、経験的には１５ｋｇを越えていると思われる。
これは少なくても従来の５倍以上にもなり、外観においても満足できるものとなった。
【００３１】
リング状バンドが頭飾品として使用される時、瞬間にバンドに掛かる荷重最高値は３．５ｋｇ〜５ｋｇである。従来の技術によるリング状バンドの接着接合部の引張り強度の最大は２．３ｋｇであり、使用の際に少し無理をして引っ張ると接着接合部が簡単に破断する。本願の各製品は、全てが少なくとも１０ｋｇの引張り荷重に耐えており、通常の使用に全く問題はない。
【００３２】
ゴム芯入り紐の接着接合部に補助的な補強を施した他の実施例
前記実施例１において、図２（ｄ）に示す、材料紐（１ｂ）の両端を切断して、リング状バンドの展開長さに対応する長さＬのゴム芯入り紐（１）を得た後、図８（ａ）に示す如く、ゴム芯（２）の両端面の中央に、ドリル等で穴（２０）を開設する。
穴（２０）は、直径０．５〜１．２ｍｍ、深さ１〜３ｍｍである。
ゴム芯（２）の両端面に穴（２０）（２０）を開設した後は、実施例１と同様にして、固化剤による固化及び固化部を多孔質に形成する工程、図２（ｅ）のゴム芯入り紐（１）の両端の接着接合工程を経て、リング状バンドを形成する。
【００３３】
図８（ｂ）に示す如く、ゴム芯入り紐（１）の両端面を接着する接着剤（５）がゴム芯（２）の穴（２１）（２１）に侵入して固化し、ゴム芯入り紐（１）の端面どうしの接着結合力をより強硬にする役割を成す。又、穴（２０）（２０）に充満した接着剤（５）が柱状となって硬化するため、接合部分での屈曲やズレを防止できる。
【００３４】
図９に示す如く、上記ゴム芯（２）両端面の穴（２０）（２０）に跨って接合強化用小片（６）を挿入することもできる。
接合強化用小片（６）は、硬質ゴム、合成樹脂にて形成され、長さ２〜５ｍｍ、
太さ０．５〜１．２ｍｍである。
ゴム芯（２）の一方の端面の穴（２０）に接合強化用小片（６）の一端側を全長の略半分を挿入し、他端を端面から突出させる。
ゴム芯（２）の他方の端面に前記同様の接着剤（５）を塗布する。
ゴム芯（２）の両端を突き合わせて接合する。端面どうしの突き合わせの際、一方の端面から突出した接合強化用小片（６）の略半分が、他方の端面の穴（２１）に侵入し、接合強化用小片（６）は、両穴（２０）（２０）に跨って埋設される。
接着剤（５）は、穴（２０）と接合強化用小片（６）の隙間にも侵入する。
接合強化用小片（６）が両穴（２０）（２０）に跨って埋設且つ穴面に接着されることにより、接着面積を増やして物理的により大きな結合力を得ることができる。
又、ゴム芯入り紐（１）両端の接合において、接合強化用小片（６）が、ゴム芯入り紐（１）の端面どうしがずれない様に案内する役割を果たすため、突合わせ作業を簡易化する。更に、接合強化用小片（６）によって、突き合わせ端面の中心が確実に一致するため、強度にばらつきのない、一様な結合力を持つリング状バンドを製造出来る。
【００３５】
本発明の実施に際し、材料紐（１ｂ）の先端部に固化剤を塗布する前に、有機溶剤系洗浄剤で材料紐（１ｂ）の先端部を洗浄しておくことができる。
伸縮性カバー（３）を構成する糸には、製造時にワックスが使用されている。上記実施例の材料紐（１ｂ）の場合、ワックスの量はそれほどでもないが、該ワックスの量によっては、ワックスが伸縮性カバー（３）への固化剤の浸透を妨げる。糸が高級なほど、又、伸縮性カバー（３）のデザインが凝っているほど、ワックスの使用量は多い。そこで、有機溶剤系洗浄剤によって、材料紐（１ｂ）の端部からワックスを除去しておき、固化剤の浸透性を高めておくことが望ましい。ワックスの除去が不可欠である場合も生じる。
【００３６】
上記実施例の説明は、本発明を説明するためのものであって、特許請求の範囲に記載の発明を限定し、或は範囲を減縮する様に解すべきではない。又、本発明の各部構成は上記実施例に限らず、特許請求の範囲に記載の技術的範囲内で種々の変形が可能であることは勿論である。
【００３７】
例えば、リング状バンドに帯電防止処理を施すことができる。
帯電防止処理法として、陽イオン（カチオン）系界面活性剤または非イオン系界面活性剤（なかでも脂肪族アミンに酸化エチレンを付加させたもの）に浸すことを挙げることができる。この界面活性剤は、静電気の発生を少なくするとともに表面に水を吸いやすい膜を作り、静電気を逃がすので帯電防止剤として使うことができる。
これらの界面活性剤に浸す工程は、材料紐（１ｂ）を所定の長さに切断する前でも、ゴム芯入り紐（１）の端部どうしの接着接合後でも可く、順序は問わない。
【００３８】
又、リング状バンドに除菌処理を施すことができる。
除菌処理の方法として、陽イオン系界面活性剤または両性イオン系界面活性剤に浸すことを挙げる。この界面活性剤は殺菌性が強いので、除菌剤として使うことができる。これらの除菌処理工程は、ゴム芯入り紐（１）を所定の長さに切断する前でも、ゴム芯入り紐（１）の端部どうしの接着接合後でも可く、順序は問わない。
【００３９】
又、前記各実施例において、図２（ｄ）に示す材料紐（１ｂ）の両端を切断除去して、ゴム芯入り紐（１）を得る工程で、切断面が材料紐（１ｂ）の軸心に対して、例えば４５°を成す様に斜めに切断しても可い。この場合、両端の切断面が互いに平行となる様に切断し、ゴム芯入り紐（１）をリング状に彎曲させたとき、ゴム芯入り紐（１）を捩ることなく両切断端面が正しく重なり合う様にする。
上記の様に、材料紐（１ｂ）の端部を軸心に対して斜めに切断すれば、両切断端面の突合せ面積を大きくして、接着剤による接着効果を高めることができる。
【００４０】
又、ゴム芯入り紐（１）に関し、ゴム芯（２）は２本とし、伸縮性カバー（３）は、伸縮性のある細糸を束ねて形成した複数本の太糸を、該太糸がゴム芯（２）間を通過する様に編製して形成された扁平体でも実施できる。
ゴム芯入り紐（１）は、ゴム芯（２）と該ゴム芯を覆う伸縮性カバー（３）から構成され伸縮性を有するという要件を満たせば、ゴム芯（２）の本数、伸縮性カバー（３）を形成する糸の種類、ゴム芯入り紐（１）の形状等、構成は自由である。
【００４１】
又、２本のゴム芯入り紐（１）を接着接合して１本の紐状伸縮性バンドを形成することができる。
夫々のゴム芯入り紐（１）（１）の接合すべき端部を前記工程と同様の工程で固化及び多孔化し、該固化部分を平坦に切断し、互いの切断端面を接着剤で接合すれば可い。
同様にして３本以上のゴム芯入り紐（１）を１本に繋ぐことができる。
【００４２】
又、固化剤に、染料を添加しておくことができる。染料を伸縮性カバー（３）の色に合わせておけば、乾燥して白っぽく変色する固化剤の存在を隠すことができる。
【００４３】
尚、ゴム芯の存在しない繊維質の紐どうしを接着接合することもできる。本発明に係る固化剤で、紐の端部を固め、固まった部分を切断し、紐の切断端緬どうしを接着剤を介して突き合わせて接着接合すればよい。
【図面の簡単な説明】
【図１】本実施例のリング状バンドの一部を断面で示した平面図である。
【図２】リング状バンドの製造工程の説明図である。
【図３】ゴム芯入り紐を軸方向に破断して、模式的に示した拡大断面図である。
【図４】ゴム芯入り紐の端部に固化剤が浸透した状態の断面図である。
【図５】同上の固化剤の水分が蒸発して微細な孔が形成された状態の断面図である。
【図６】同上の孔がガスによって膨らんだ状態の断面図である。
【図７】ゴム芯入り紐の接着接合部の拡大断面図である。
【図８】ａ図はゴム芯の両端に穴を開設した状態の断面図、ｂ図は、２つの穴に跨って接合強化用小片を埋設した接着接合部の断面図である。
【図９】ゴム芯間に接合強化用小片を食い込ませ埋設した接着接合部の断面図である。
【符号の説明】
（１）ゴム芯入り紐
（２）ゴム芯
（３）伸縮性カバー
（４）固化剤
（５）接着剤
（６）接合強化用小片[0001]
[Field of the Invention]
TECHNICAL FIELD The present invention relates to a hair banding tool, a fastener for an article, an elastic band used as a decoration attached to an arm, a manufacturing method thereof, and a pretreatment solidifying agent for adhesively bonding the band.
[0002]
[Prior art and problems to be solved]
A ring-shaped elastic band formed by adhering and bonding both ends of a string with a predetermined length constituted by a rubber core and an elastic cover that covers the rubber core has been put into practical use.
The problem when adhesively bonding both ends of a string with a rubber core is that the end face of the elastic cover becomes fuzzy at the end of the string with a rubber core, and the end surface of the rubber core tends to be dented due to the shrinkage of the rubber. It is that the end surface of the entering string does not become flat. If the end surface to be adhesively bonded is not flat, the degree of adhesion to the mating end surface will be small, the adhesive will not work well, and the bonding force will be weakened.
Therefore, the end of the rubber cored string is hardened in advance with an adhesive (Patent Document 1), or the planned cutting portion of the long rubber cored string (1) is cooled and solidified (Patent Document 2). Thus, it has been proposed to flatten the cut end face to be adhesively bonded.
[0003]
Patent Document 1 describes a step of immersing the entire rubber cored string in a water-soluble adhesive (aqueous solution of 3% polyvinyl alcohol in the embodiment), and drying it so that the elastic cover and the rubber core are in close contact with each other; A process of cutting a rubber cored string to a desired length and bonding the cut end faces with a water-insoluble adhesive to form a ring shape, and the surface of the completed ring band turns white when dried and remains. And a step of removing the water-soluble adhesive.
When the applicant tried to implement Patent Document 1, it was found that there were the following problems.
1. Since the water-soluble adhesive enters the gap between the fibers forming the cover of the rubber cored string and the gap between the cover and the rubber core, it prevents the water-insoluble adhesive that will be applied later from penetrating. Adhesion only between the tip surfaces of the. For this reason, the strength of the joint portion of the elastic band is weak, and it is easy to break when the band is pulled. This tendency is stronger as the concentration of the water-soluble adhesive becomes higher.
As a result of applying a load to the ring-shaped band and performing a tensile strength test on the adhesive joint, the maximum value of 100 pieces was 2.3 kg, and more than half of them were not able to withstand a tensile force of 500 g (test method) Is described in Examples below).
Also, if the elastic cover has a large amount of fibers, the water-soluble adhesive does not keep the fibers well, the fibers between the ends of the rubber cored string are difficult to bond to each other, and the bonded portion swells and looks bad. Detract from value.
2. Since the entire string with rubber core is soaked in water-soluble adhesive, the water-soluble adhesive that has been dried and powdered has entered the rubber core in a state where the water-soluble adhesive has entered between the fibers of the cover or between the cover and the rubber core. It remains over the entire length of the string. For this reason, it takes time to clean and remove the powdery adhesive.
When the step of removing the water-soluble adhesive in powder form is omitted, the powder adhesive comes out of the fiber every time the ring-shaped band is used. Therefore, the cleaning process is indispensable. Depending on the type of the rubber cord, the texture may be remarkably impaired as a result of washing, and the types of the rubber cored cord that can be bonded are limited.
[0004]
Patent Document 2 discloses a step of partially solidifying a long rubber core string with a cooling solidifying agent, a step of cutting the solidified portion, a removal of oil at the end portion in a state where the cut end portion is returned to a non-solidified state, and the like. For this purpose, it comprises a step of applying a pretreatment agent and a step of adhering both ends of a string with rubber core with an adhesive.
When the applicant tried to implement Document 2, it was found that there were the following problems.
1. When liquid nitrogen, which is mentioned as a cooling solidifying agent, is sprayed onto a string with a rubber core, the nitrogen concentration in the indoor environment of the workplace increases. Since mechanization is difficult, it is dangerous for the human body to use liquid nitrogen gas for the rubber string bonding operation that is currently performed manually in the room.
2. The storage temperature of liquid nitrogen is −190 ° C., and when this is sprayed, it rises to −80 ° C. to −70 ° C. Therefore, even if the surface of the string with the rubber core is cooled by spraying liquid nitrogen, only the fibers on the surface of the string are cooled, and the rubber core is not solidified.
Attempts were made to immerse the rubber cored string in liquid nitrogen at −190 ° C., and the entire rubber cored string could be cooled and solidified, but the solidified part was too hard and could not be cut with a normal cutting tool.
3. When the cut end portion of the string with the rubber core returns to the non-solidified state, the fibers of the cut portion are unwound and spread, and the end surface of the rubber core is covered. Therefore, it is difficult to successfully apply the pretreatment agent and the adhesive to the end surface of the rubber core. The end faces of the rubber core cannot be completely butted together and bonded. In this case, it is meaningless to cool and solidify the end of the rubber cored string.
[0005]
In view of the above points, the applicant has made research efforts to improve the tensile strength of the adhesive joint of the rubber cored string. As a result, the applicant has solved the conventional problems and dramatically increased the tensile strength of the adhesive joint. An elastic band that can be improved, a manufacturing method thereof, and a pretreatment solidifying agent for adhesively bonding the band are completed.
[0006]
[Patent Document 1]
Japanese Patent No. 3091832
[Patent Document 2]
Japanese Patent Laid-Open No. 2002-240154
[0007]
[Means for Solving the Problems]
The solidifying agent of the present invention has a rubber core-cored string when the end surface of the rubber core-cored string (1) constituted by the rubber core (2) and the elastic cover (3) covering the rubber core is bonded and joined. A water-soluble solidifying agent for solidifying the end of (1), wherein the solidifying agent contains an expansion agent.
[0008]
The elastic band production method of the present invention is such that the solidifying agent is applied to both ends of a material string (1b) containing a rubber core, and the end of the rubber core (2) and the end of the elastic cover (3) are integrated. The process of making the solidified part porous by the action of an expanding agent,
Cutting the solidified portions (10) and (10) at both ends of the material string (1b) to obtain a string (1) with a rubber core corresponding to the developed length of the ring-shaped band;
It includes a step of connecting both the cut end surfaces of the rubber cored string (1) by abutting each other via an adhesive (5) and connecting the rubber cored string (1) in a ring shape.
[0009]
[Action and effect]
When a solidifying agent is applied to the end of the material string (1b), the solidifying agent enters the inside of the elastic cover (3) and the gap between the elastic cover (3) and the rubber core (2). Since the end portion of the material string (1b) solidified by the solidifying agent is cut to obtain the rubber core-cored string (1), the cut end surface of the rubber core-cored string (1) does not cause fuzz of the elastic cover (3). Moreover, a flat cut end surface can be obtained irrespective of the difference in the material of a string (3) and a rubber core (2).
Since the solidifying agent is directly applied to the end surface of the material string (1b), the end surface of the rubber core (2) and the end surface of the stretchable cover (3) can be securely solidified.
Further, since the flat cut surfaces of the rubber-cored string (1) are brought into contact with each other via an adhesive, the adhesive force can be improved.
[0010]
In the case of the present invention, it has been confirmed by experiments that the bonding strength of the joint is about five times better than the conventional bonding method.
The applicant believes that this is because the adhesive bites into the end face of the rubber core (2) and hardens, thereby increasing the mechanical coupling force.
As is well known, rubber is a porous body having many fine pores.
When the solidifying agent is applied to the end of the material string (1b), the water-soluble solidifying agent penetrates from the end of the rubber core (2) into the fine holes of the rubber material. When the solidifying agent is dried, the rubber core (2) and the elastic cover (3) are solidified integrally at the end of the material string (1b). Moisture and volatile components in the solidifying agent are evaporated or vaporized. A large number of fine pores (41) remain in the dried solidifying agent due to evaporation and vaporization thereof, and become porous. Further, gas is generated by the gas generating action of the expanding agent, and the pores (41) of the porous solidifying agent (4) are expanded.
When the both ends solidified portion of the material string (1b) is cut within the range of the solidified portion to obtain the rubber cored string (1), the end of the rubber cored string (1) has an expanded hole. Part of (41) remains. When the cut surfaces are brought into contact with each other via the adhesive (5), the adhesive (5) penetrates into the hole (41) and solidifies, and this acts as a mechanical bond to bond the ring-shaped band. It is thought that the tensile strength of the joint was greatly improved.
As shown in FIG. 7, when the joint part of the rubber cored string was enlarged, a part of the adhesive bite into the inside from the end face of the rubber core and solidified, and the state could be confirmed.
[0011]
【Example】
Example 1
FIG. 1 shows an elastic ring-shaped band formed by the method of the present invention. Both ends of a string (1) with a rubber core comprising a rubber core (2) and an elastic cover (3) covering the rubber core. Are bonded together. The adhesive joint (11) of the ring-shaped band is hardly understood from the appearance. When the band is touched, there is only one hard part, and it can be understood that this is an adhesive joint.
[0012]
FIG. 2 shows a manufacturing process of the ring-shaped band.
Fig.2 (a) has shown the long string (1a) with a rubber core which is a material of a ring-shaped band.
The cross section of the rubber core (2) is a square having a side of 2.5 mm, but is deformed because it is covered with the elastic cover (3), and the end surface of the long string (1a) has a diameter of 4. It has a substantially circular shape of 5 mm.
The elastic cover (3) is knitted, woven or braided with fiber yarn such as cotton yarn, synthetic fiber yarn, etc., so that it can accommodate the expansion and contraction of the rubber core (2) in the length direction of the long cord (1a). It is formed to be stretchable.
[0013]
As shown in FIG.2 (b), the said long string (1a) is cut | disconnected to length L1 slightly longer than the unfolded length L of a ring-shaped band, and a material string (1b) is obtained.
The reason why the material string (1b) is made slightly longer than the developed length of the ring-shaped band is to cut off both ends of the material string (1b) a little to correspond to the developed length of the ring-shaped band in the following process.
In the embodiment, the developed length L of the ring-shaped band is 150 mm, the length of the material string (1b) is 155 mm, and the cut-off allowance is 2.5 mm.
[0014]
As shown in FIG.2 (c), the solidifying agent (4) is apply | coated to the both ends of a material string (1b), and the rubber core (2) and elastic | stretch cover (3) of this edge part are solidified integrally.
The solidifying agent (4) was developed for the present invention. As shown in FIG. 5, the fine pores (41) (41) formed when the solidifying agent (4) dries are enlarged. It contains a pore expanding component to be caused.
The solidifying agent of the example is used by mixing with water, a solidifying component that serves to solidify the rubber core (2) of the rubber core-containing string (1) and the elastic cover (3), water, Contains a swelling agent which is a pore expanding component.
60 cc of polyvinyl alcohol-based glue (manufactured by Nippon Gosei Sangyo Co., Ltd.) was used as the solidifying component, and 0.5 g of sodium bicarbonate was used as the swelling agent, and these were dissolved in 40 cc of water to obtain a solidifying agent.
In the examples, the tip of the material string (1b) was dipped about 1 cm in a container containing the solidifying agent, and the solidifying agent (4) was applied so as not to cause coating spots. As shown in FIG. 4, the solidifying agent (4) penetrates between the stretchable cover (3) and the rubber core (2), the fibers of the stretchable cover (3) and the fine holes in the rubber core (2). To do.
[0015]
Hot air is applied to the solidifying agent adhering portion to forcibly dry the solidifying agent (4). This is to shorten the drying time of the solidifying agent (4) and promote the reaction of the swelling agent contained in the solidifying agent (4). The temperature of the hot air is 50 ° C., and the heating time is 10 minutes. Actually, a large number of strings (1) with rubber cores were accommodated in a drying box so that the solidifying agents were not in contact with each other, and warm air was supplied to the box to dry it. The temperature of the string with rubber core (1) reached 70 ° C.
During the drying of the solidifying agent (4), water and volatile components in the solidifying agent are evaporated or vaporized, and the dried solidifying agent has a number of fine pores (41) and (41) due to the evaporation and vaporization. The remainder becomes porous.
Since sodium bicarbonate decomposes at 65 ° C. or higher, carbon dioxide gas is generated during the heating and drying step. As shown in FIG. 6, this gas expands the holes by expanding the holes (41) and (41) of the porous solidifying agent (4).
[0016]
As shown in FIG. 2 (d), the solidified portions (10) and (10) at both ends of the material string (1b) are cut perpendicularly to the length direction of the material string (1b), and the developed length of the ring-shaped band is obtained. A string (1) with a rubber core having a length corresponding to L is obtained.
Since the portion (10) where the rubber core (2) and the elastic cover (3) are solidified is cut, the elastic cover (3) is not fuzzed on the cut end face, and the string (3) and rubber Despite the difference in the material of the core (2), the cut end is flat.
[0017]
A water-insoluble adhesive (5) is applied to one end surface of the rubber core-cored string (1), both end surfaces are butted with their centers coincided, and pressure bonded in the butting direction for adhesive bonding.
A stretchable cover (3), a gap between the cover (3) and the rubber core (2) and a solidifying agent (4) which has penetrated and dried into the end of the rubber core (2) and has become porous. The adhesive (5) penetrates into the enlarged holes (41) and (41) and solidifies. The adhesive that has penetrated and solidified into the holes (41) serves to mechanically bond the end faces of the rubber cored string (1), and a strong bonding force can be obtained.
There is no step in the outer periphery of the adhesively bonded string (1), and the adhesive is prevented from penetrating into the hole (41) of the solidifying agent and protruding to the outer peripheral side of the bonded portion. The adhesive joint does not bulge, and the adhesive joint has a beautiful appearance that cannot be distinguished from other parts.
[0018]
In the examples, a cyanoacrylate adhesive (trade name “Cyanobond RP-LX” manufactured by Taoka Chemical Co., Ltd.) having permeability and quick drying was used as the adhesive.
The reason why the adhesive is applied only to one end face of the rubber cored cord (1) is that a sufficiently satisfactory adhesive force can be obtained.
When the adhesive (5) is applied to both end faces of the rubber cored string (1), the end face on which the adhesive is first applied is in a state where the adhesive is dry due to a time difference in application. Since it contacts with the adhesive on the other end face, the adhesive force may be reduced.
[0019]
Furthermore, if more than the necessary amount of adhesive is applied, the adhesive is pushed out and solidified to the outer peripheral portion of the end face, and protrudes as a burr from the outer periphery of the adhesive joint, impairing the appearance.
Moreover, when a ring-shaped band is used for the hair, the burr is caught on the hair. It is extremely time-consuming to cleanly remove burrs generated by the solidification of the adhesive in the subsequent process, resulting in high costs.
In order to apply the adhesive (5) to the end face of the rubber core-cored string (1), the adhesive may be dropped onto the end face with the end face facing upward. The adhesive does not flow out of the end face due to surface tension, but penetrates into the inside.
[0020]
The ring-shaped band formed in the above process has the adhesive (5) infiltrated into the hole (41) of the solidifying agent (4) in the adhesive joint, and has been solidified. Although the amount is very small, in the vicinity of the adhesive joint, the solidifying agent turns white after drying and remains on the surface of the stretchable cover (3). Depending on the color of the elastic cover (3) of the string with rubber core (1), the remaining solidifying agent may appear as if the band is dirty.
In that case, the vicinity including the adhesive joint (11) may be washed with water to wash away the water-soluble solidifying agent adhering to the stretchable cover (3). It is not necessary to wash the entire ring-shaped band with water, and it is only necessary to wash the adhesive joint.
Since the washing is performed with water, the water-insoluble adhesive (5) that bonds the end faces of the rubber core-cored string (1) is not adversely affected such as a decrease in adhesive strength.
[0021]
Other examples of solidifying agents
Examples of the solidifying component in the solidifying agent include wheat flour, starch powder, and super fine powder in addition to the polyvinyl alcohol-based paste. In the case of the present invention, the solidifying component can be rephrased as “a polymer material having a characteristic of being used by mixing with water and solidifying the rubber cored string (1)”.
Examples of the expanding agent that is a pore expanding component contained in the solidifying agent include ammonium bicarbonate, ammonium bicarbonate, ammonium chloride, ammonium carbonate, tartaric acid, potassium hydrogen tartrate, baked alum, yeast powder, baking powder, etc. be able to. In addition, the “expansion agent” referred to in the present invention includes those that should be rephrased as “foaming agent”.
Moreover, it can replace with a swelling agent and can mention the decomposition | disassembly microbe or decomposition enzyme with respect to the said solidification effect | action component, or an organic solvent type | system | group cleaning agent.
The decomposing bacteria and degrading enzymes decompose the solidifying component and enlarge the pores (41) of the solidifying agent.
Examples of degrading bacteria and degrading enzymes include yeast, brewer's yeast, koji mold, and polyvinyl alcohol degrading bacteria.
[0022]
The organic solvent-based cleaning agent removes dirt, oil, and solidifying components that penetrate the fine holes inside the rubber from the end face of the rubber core and clogs the holes, and the cleaning agent itself vaporizes. It has the function of leaving holes.
Examples of the organic solvent-based cleaning agent include anone, methanol, methyl ethyl ketone, propylene dichloride, dichloromethane, tetrahydrofuran, toluene, n-heptane, and acetone.
[0023]
Accordingly, examples of mixing the solidifying agent include the following.
(A). Sodium bicarbonate + wheat flour + water
(B). Sodium bicarbonate + starch paste + water
(C). Sodium bicarbonate + upper fresh powder + water
(D). Sodium bicarbonate + polyvinyl alcohol paste + water
(E). (A) to (d) sodium carbonate replaced with yeast
(F). (A) ~ (e) sodium bicarbonate or yeast was replaced with solidification component decomposing bacteria or solidification component decomposing enzyme
(G). (A) to (f) sodium bicarbonate, yeast, solidifying component decomposing bacteria, or solidifying component decomposing enzyme replaced with organic solvent-based detergent
In the above mixing example, when yeast is used, it is desirable to add a small amount of sugar. The function of yeast is activated by the sugar, and the pores (41) of the solidifying agent (4) can be made larger.
[0024]
Example 2
The solidifying component and blending ratio of Example 1 are the same as those of Example 1 except for the solidifying component.
The solidifying agent is a mixture of 20 g of wheat flour, 80 cc of water and 1 g of sodium bicarbonate.
[0025]
Example 3
The solidifying agent and the drying step of the solidifying agent are different from those of Example 1, and the others are the same as Example 1.
The solidifying agent is a mixture of 20 g of flour, 80 cc of water and 1 g of yeast.
When the solidifying agent is immersed in the end of the material string (1b) and then dried, when the temperature reaches 30 ° C., the temperature is maintained for about 5 to 10 minutes. In the meantime, the yeast is activated and the pores (41) of the solidifying agent (4) can be enlarged.
[0026]
Example 4
The blending ratio of the solidifying agent is different from that in Example 3, and the others are the same as in Example 3.
The solidifying agent is a mixture of 20 g of flour, 80 cc of water and 2 g of yeast.
[0027]
Example 5
An example of a solidifying agent containing an organic solvent-based cleaning agent.
The same as Example 1 except for the solidifying agent.
The solidifying agent is a mixture of 40 g of polyvinyl alcohol-based paste, 20 cc of methanol, and 40 cc of water.
[0028]
Example 6
An example of a solidifying agent containing a swelling agent and an organic solvent-based cleaning agent.
The same as Example 1 except for the solidifying agent.
The solidifying agent is a mixture of 40 g of polyvinyl alcohol paste, 20 cc of acetone and 2 g of sodium hydrogen carbonate.
[0029]
Tensile strength tests were conducted on the ring-shaped band produced by the production methods of Examples 1 to 6 and the ring-shaped band produced by the production method of Patent Document 1.
sample
100 samples each
All the samples were aligned with the thickness and size of the ring-shaped hand of Example 1.
The material and thickness of the rubber core, the thickness of the elastic cover thread, and the knitting method were also the same.
Test method
Hang the ring-shaped band on the hook part of a spring balance (Nakamura Seisakusho Co., Ltd., bar-shaped tension gage “Pestule” maximum scale 10 kg), pull the lower end of the band vertically downward, At least one is based on the scale when it breaks.
Test results

[0030]
The tensile strength of the adhesive joints of the products of Examples 1 to 6 exceeds the maximum scale of 10 kg of the spring balance used, and is empirically considered to exceed 15 kg.
This is at least five times that of the conventional one, and the appearance is satisfactory.
[0031]
When a ring-shaped band is used as a head ornament, the maximum load applied to the band instantaneously is 3.5 kg to 5 kg. The maximum tensile strength of the bonded joint of the ring-shaped band according to the conventional technique is 2.3 kg, and if it is pulled slightly forcibly during use, the bonded joint is easily broken. All the products of the present application can withstand a tensile load of at least 10 kg, and there is no problem in normal use.
[0032]
Another embodiment in which auxiliary reinforcement is applied to the adhesive joint of the rubber cored string
In Example 1, the both ends of the material string (1b) shown in FIG. 2 (d) were cut to obtain a rubber-cored string (1) having a length L corresponding to the developed length of the ring-shaped band. Thereafter, as shown in FIG. 8 (a), a hole (20) is opened with a drill or the like at the center of both end faces of the rubber core (2).
The hole (20) has a diameter of 0.5 to 1.2 mm and a depth of 1 to 3 mm.
After opening the holes (20) and (20) on both end faces of the rubber core (2), the step of solidifying with a solidifying agent and forming a solidified portion in the same manner as in Example 1, FIG. 2 (e) A ring-shaped band is formed through an adhesive bonding process at both ends of the rubber core-containing string (1).
[0033]
As shown in FIG. 8 (b), the adhesive (5) for adhering both end faces of the rubber core-containing string (1) enters into the holes (21) and (21) of the rubber core (2) and is solidified. It plays a role of making the adhesive bond strength between the end faces of the entering string (1) more rigid. In addition, since the adhesive (5) filled in the holes (20) and (20) is cured in a columnar shape, bending and misalignment at the joint portion can be prevented.
[0034]
As shown in FIG. 9, a small piece (6) for strengthening bonding can also be inserted across the holes (20) and (20) on both end faces of the rubber core (2).
The joining reinforcement piece (6) is made of hard rubber or synthetic resin and has a length of 2 to 5 mm.
The thickness is 0.5 to 1.2 mm.
About one half of the entire length of the small piece for bonding reinforcement (6) is inserted into the hole (20) on one end face of the rubber core (2), and the other end is projected from the end face.
The same adhesive (5) as described above is applied to the other end face of the rubber core (2).
Both ends of the rubber core (2) are butted and joined. When the end faces are brought into contact with each other, substantially half of the joining reinforcing piece (6) protruding from one end face enters the hole (21) on the other end face, and the joining reinforcing piece (6) ) It is buried across (20).
The adhesive (5) also enters the gap between the hole (20) and the small piece for bonding reinforcement (6).
The bonding reinforcing piece (6) is embedded in both the holes (20) and (20) and bonded to the hole surface, so that the bonding area can be increased and a physically larger bonding force can be obtained.
In addition, when joining both ends of the rubber-cored string (1), the bonding reinforcing piece (6) plays a role of guiding the end surfaces of the rubber-cored string (1) so that the end faces do not shift. Turn into. Furthermore, since the center of the butt end face is surely matched by the joining reinforcing piece (6), a ring-shaped band having a uniform bonding force with no variation in strength can be manufactured.
[0035]
In carrying out the present invention, the tip of the material string (1b) can be washed with an organic solvent-based cleaning agent before applying the solidifying agent to the tip of the material string (1b).
Wax is used for the yarn constituting the stretchable cover (3) at the time of manufacture. In the case of the material string (1b) of the above example, the amount of the wax is not so much, but depending on the amount of the wax, the wax prevents the penetration of the solidifying agent into the stretchable cover (3). The higher the yarn and the more elaborate the design of the elastic cover (3), the more wax is used. Therefore, it is desirable to remove the wax from the end of the material string (1b) with an organic solvent-based cleaning agent to enhance the permeability of the solidifying agent. Occasionally, wax removal is essential.
[0036]
The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof. In addition, the configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims.
[0037]
For example, an antistatic treatment can be applied to the ring-shaped band.
Examples of the antistatic treatment method include soaking in a cationic (cationic) surfactant or a nonionic surfactant (especially, an aliphatic amine added with ethylene oxide). This surfactant can be used as an antistatic agent because it reduces the generation of static electricity and forms a film that easily absorbs water on the surface and releases static electricity.
The step of immersing in these surfactants can be performed before the material string (1b) is cut to a predetermined length or after the adhesive bonding between the ends of the rubber cored string (1), and the order is not limited.
[0038]
Further, the ring band can be sterilized.
As a method of the sterilization treatment, it is mentioned to immerse in a cationic surfactant or a zwitterionic surfactant. Since this surfactant has strong bactericidal properties, it can be used as a disinfectant. These sterilization treatment steps may be performed before the rubber cored string (1) is cut into a predetermined length or after the adhesive bonding between the ends of the rubber cored string (1), and the order is not limited.
[0039]
In each of the above embodiments, the both ends of the material string (1b) shown in FIG. 2 (d) are cut and removed to obtain the rubber core-containing string (1), and the cut surface is the axis of the material string (1b). For example, it may be cut obliquely so as to form 45 ° with respect to the heart. In this case, when the cut surfaces at both ends are cut so that they are parallel to each other and the rubber cored cord (1) is bent into a ring shape, the two cut end surfaces correctly overlap without twisting the rubber cored cord (1). Like.
As described above, if the end portion of the material string (1b) is cut obliquely with respect to the axial center, the abutting area of both cut end faces can be increased, and the adhesive effect by the adhesive can be enhanced.
[0040]
The rubber core-containing string (1) has two rubber cores (2), and the elastic cover (3) has a plurality of thick threads formed by bundling elastic thin threads. Can also be implemented by a flat body formed by knitting so as to pass between the rubber cores (2).
If the string (1) with the rubber core is composed of the rubber core (2) and the elastic cover (3) covering the rubber core and satisfies the requirement of having elasticity, the number of the rubber cores (2), the elastic cover Configurations such as the type of yarn forming (3) and the shape of the string (1) with rubber core are arbitrary.
[0041]
In addition, two cords with rubber core (1) can be adhesively bonded to form one cord-like stretchable band.
The rubber cored cords (1) and (1) should be joined to the ends to be joined in the same process as described above, solidified and porous, the solidified parts are cut flat, and the cut end faces are joined with an adhesive. Yes.
Similarly, three or more rubber cored strings (1) can be connected to one.
[0042]
Further, a dye can be added to the solidifying agent. If the dye is matched to the color of the stretchable cover (3), it is possible to hide the presence of a solidifying agent that turns dry and turns whitish.
[0043]
It is also possible to adhesively bond fiber strings without rubber cores. With the solidifying agent according to the present invention, the ends of the string may be hardened, the solidified portion may be cut, and the cut ends of the string may be brought into contact with each other via an adhesive and bonded.
[Brief description of the drawings]
FIG. 1 is a plan view showing a part of a ring-shaped band of the present embodiment in cross section.
FIG. 2 is an explanatory diagram of a manufacturing process of a ring-shaped band.
FIG. 3 is an enlarged cross-sectional view schematically showing a rubber cored string broken in the axial direction.
FIG. 4 is a cross-sectional view of a state in which a solidifying agent has permeated into an end portion of a rubber cored string.
FIG. 5 is a cross-sectional view showing a state in which fine pores are formed by evaporation of moisture of the solidifying agent.
FIG. 6 is a cross-sectional view showing a state in which the hole is expanded by gas.
FIG. 7 is an enlarged cross-sectional view of an adhesive joint portion of a string with a rubber core.
8A is a cross-sectional view of a state where holes are opened at both ends of a rubber core, and FIG. 8B is a cross-sectional view of a bonded joint portion in which a small piece for bonding reinforcement is embedded across two holes.
FIG. 9 is a cross-sectional view of an adhesive bonded portion in which a small piece for bonding reinforcement is embedded between rubber cores and embedded.
[Explanation of symbols]
(1) String with rubber core
(2) Rubber core
(3) Elastic cover
(4) Solidifying agent
(5) Adhesive
(6) Small pieces for bonding reinforcement

Claims

In the previous step of bonding and joining the end faces of the rubber cored string (1) with the rubber core (2) covered by the elastic cover (3), the end part is attached to the end of the rubber cored string (1). A solidifying agent used for solidifying the rubber, wherein the solidifying agent is mixed with water and used to solidify the rubber cored string (1), water, sodium bicarbonate, yeast A band adhering solidifying agent characterized by containing an expanding agent such as powder.

In the previous step of bonding and joining the end faces of the rubber cored string (1) with the rubber core (2) covered by the elastic cover (3), the end part is attached to the end of the rubber cored string (1). A solidifying agent used for solidifying the solidifying agent, wherein the solidifying agent is mixed with water and used to solidify the rubber cored string (1), water, and the solidifying component. A band-adhesive solidifying agent comprising a degrading bacterium or a degrading enzyme.

In the previous step of bonding and joining the end faces of the rubber cored string (1) with the rubber core (2) covered by the elastic cover (3), the end part is attached to the end of the rubber cored string (1). A solidifying agent used to solidify the rubber, wherein the solidifying agent is mixed with water and used to solidify the rubber cored string (1), water, and an organic solvent-based cleaning agent A band-adhesive solidifying agent comprising:

In a method for manufacturing a ring-shaped elastic band by joining the two end surfaces of a single rubber-cored string (1) in which a rubber core (2) is covered with an elastic cover (3),
The solidifying agent according to any one of claims 1 to 3 is applied to both ends of a material string (1b) containing a rubber core, and the end of the rubber core (2) and the end of the elastic cover (3) are integrated. The process of solidifying,
A step of cutting the solidified portions (10) and (10) at both ends of the material string (1b) to obtain a rubber-cored string (1) having a length corresponding to the developed length of the ring-shaped band;
A process of joining the cut end faces of the rubber cored string (1) by abutting each other via an adhesive (5) and connecting the rubber cored string (1) in a ring shape;
Of elastic band including

In a method of manufacturing a stretchable band by joining a plurality of rubber cored cords (1) each having a rubber core (2) covered with a stretchable cover (3) to the end surfaces of adjacent mating rubber cored cords,
The solidifying agent according to any one of claims 1 to 3 is applied to both ends of the material string (1b) containing a rubber core, and the end of the rubber core (2) and the end of the elastic cover (3) The process of solidifying the parts together,
A step of cutting the solidified portion (10) at the end of the material string (1b) flat to obtain a string (1) with a rubber core having a predetermined length;
A step of obtaining a plurality of rubber core-cored strings (1) by the above-described process, and abutting and bonding each other's cut end surface and the end surface of the other rubber core-cored string (1) with an adhesive (5),
Of elastic band including

Including the step of opening a hole (20) (20) in the center of the end face of the rubber core (2), and bonding the end faces of the rubber core-containing string (1) to both holes (20) (20). The method for producing a stretchable band according to claim 4 or 5, wherein an adhesive is allowed to enter.

The process of opening a hole (20) (20) in the center part of the end surface of a rubber core (2), the process of inserting the small piece (6) for reinforcement | strengthening across both holes (20) (20) is included. 4. A method for producing a stretchable band according to 4 or 5.

An elastic band manufactured by the method according to claim 4.