JP3560602B1 - Stretchable band and method of bonding the band - Google Patents
Stretchable band and method of bonding the band Download PDFInfo
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- Package Frames And Binding Bands (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
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Abstract
【課題】ゴム芯入り紐の両端を接着接合してリング状バンドを形成するに際し、接着接合部の接着結合力を高める。
【解決する手段】材料紐１ｂの両端面にイーストパウダー等の膨張剤を含む固化剤を塗布し、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によって発生するガスにより固化部を多孔質とする工程、材料紐１ｂの両端の固化部分１０、１０を平坦に切断して、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を介して突合せて接着する。接着剤がゴム芯端面の微細な孔に侵入してゴム芯入り紐１を強固に接合する。
【選択図】 図２An object of the present invention is to enhance the bonding strength of a bonding portion when forming a ring-shaped band by bonding both ends of a cord containing a rubber core.
SOLUTION: A solidifying agent containing an expanding agent such as yeast powder is applied to both end surfaces of a material string 1b to solidify an end of a rubber core 2 and an end of an elastic cover 3 and generate the expanding agent by the expanding agent. Step of making the solidified portion porous with gas, and step of cutting the solidified portions 10, 10 at both ends of the material string 1b flat to obtain a rubber cored cord 1 having a length corresponding to the developed length of the ring-shaped band. Then, both cut end faces of the rubber cored cord 1 are butted and bonded via an adhesive 5. The adhesive penetrates into the fine holes in the end face of the rubber core and firmly joins the rubber cored cord 1.
[Selection] Figure 2
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とその製造方法に関する。
【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不可欠である。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】
本発明の伸縮性バンドの製法は、ゴム芯 ( ２ ) を繊維糸製伸縮性カバー ( ３ ) によって覆ったゴム芯入り紐 ( １ ) の１本又は複数本の端面どうしを接合してリング状又は紐状の伸縮性バンドを製造する方法において、
水と混合して用いられゴム芯入り紐 ( １ ) を固める作用のある固化作用成分と、水と、炭酸水素ナトリウム、イーストパウダー等の膨張剤とを含む固化剤を、ゴム芯入りの材料紐 (1b) のゴム芯端面を含む端部に直接に塗布し、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作用によって固化部分を多孔質に形成する工程、
材料紐 (1b) の固化部分 (10) 上を平坦に切断して、ゴム芯入り紐 ( １ ) を得る工程、
ゴム芯入り紐 ( １ ) の切断端面に非水溶性の接着剤 ( ５ ) を介して、切断端面どうしを突き合わせ、切断端面に表出する孔に非水溶性の接着剤 ( ５ ) を浸透し固化させて端面どうしを接着し、ゴム芯入り紐 ( １ ) を繋ぐ工程を含んでいる。
【０００８】
本発明の伸縮性バンドは、上記方法で１又は複数本のゴム芯入り紐をリング状又は紐状に接合して形成されている。
【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)の端面を含む端面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)は一体に固まり、このとき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た状態を確認できた。
【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)の端面に浸透して乾燥し、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。
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]
The present invention relates to a stretchable band used as a decoration for a hair wrapper, a fastener for an article, an arm, or the like.WhenHow to make itTo the lawRelated.
[0002]
2. Description of the Related Art and Problems to be Solved
A ring-shaped elastic band formed by bonding and joining both ends of a rubber core-containing cord having a predetermined length composed of a rubber core and an elastic cover covering the rubber core has been put into practical use.
The problem with bonding both ends of the rubber cored cord is that at the end of the rubber cored cord, the end surface of the elastic cover becomes fluffy, and the rubber core end surface tends to dent due to rubber contraction. The end face of the cord is not flat. If the end face to be bonded and joined is not flat, the degree of adhesion to the mating end face becomes small, the adhesive is less effective, and the joining force is weakened.
Accordingly, the end of the rubber cored cord is solidified in advance with an adhesive (Patent Literature 1), or the cut portion of the long rubber cored cord (1) is cooled and solidified (
[0003]
When the applicant tried to carry out
1. The water-soluble adhesive enters the gap between the fibers forming the cover of the rubber cored cord and the gap between the cover and the rubber core, and prevents the penetration of the non-water-soluble adhesive to be applied later. Will be bonded only between the tip surfaces. Therefore, the strength of the joint of the elastic band is weak, and the band is easily cut when the band is pulled. The higher the concentration of the water-soluble adhesive, the stronger this tendency.
As a result of applying a load to the ring-shaped band and performing a tensile strength test of the adhesive joint, the maximum value was 2.3 kg out of 100 pieces, and more than half of them failed to withstand the tensile force of 500 g and broke. It will be described later in Examples).
Also, when the amount of fiber in the elastic cover is large, the water-soluble adhesive does not clump the fibers, it is difficult for the fibers at the ends of the cords with rubber core to adhere to each other, and the adhesive parts are swollen and the appearance is poor, and Losing value.
2. Since the whole cord with rubber core is soaked in a water-soluble adhesive, the dry and powdered water-soluble adhesive enters the space between the fibers of the cover or between the cover and the rubber core. It remains over the entire length of the string. Therefore, it takes time to wash and remove the powdery adhesive.
When the step of removing the powdered water-soluble adhesive is omitted, the powdery adhesive comes out of the fiber every time the ring-shaped band is used. Therefore, the cleaning processUnfortunateIt is vital. Depending on the type of the rubber cord, as a result of washing, the texture may be significantly impaired, and the type of the rubber cored cord that can be bonded is limited.
[0004]
When the applicant tried to implement
1. When liquid nitrogen, which is listed as a cooling and solidifying agent, is sprayed onto the rubber cored cord, the nitrogen concentration in the indoor environment of the work place increases. Due to the difficulty of mechanization, it is dangerous for humans to use liquid nitrogen gas for rubber strap bonding work that is currently performed manually indoors.
2. The temperature during storage of liquid nitrogen is -190C, but when sprayed, it rises to -80C to -70C. Therefore, even if the surface of the rubber cored string is cooled by spraying liquid nitrogen, only the fibers on the surface of the string are cooled, and the rubber core is not solidified.
When an attempt was made to immerse the rubber cored cord in liquid nitrogen at -190 ° C, the entire rubber cored cord could be cooled and solidified, but the solidified portion was too hard and could not be cut with a normal cutting tool.
3. When the cut end portion of the rubber cored cord returns to the non-solidified state, the fiber of the cut portion is unwound and spreads, and covers the end surface of the rubber core. Therefore, it is difficult to apply a pretreatment agent or an adhesive to the end face of the rubber core successfully. Neither can the end faces of the rubber cores be perfectly abutted and bonded. In this case, it is meaningless to cool and solidify the end of the rubber cored cord.
[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 cord, and as a result, solved the conventional problem and drastically increased the tensile strength of the adhesive joint. The present invention has completed a stretchable band which can be improved, a method for producing the same, and a pretreatment solidifying agent for adhesively bonding the band.
[0006]
[Patent Document 1]
Japanese Patent No. 3091832
[Patent Document 2]
JP 2002-240154 A
[0007]
[Means for Solving the Problems]
Of the present inventionThe manufacturing method of the elastic band is a rubber core ( 2 ) The fiber yarn elastic cover ( 3 ) Rubber cored cord covered by ( 1 ) In a method for manufacturing a ring-shaped or string-shaped elastic band by joining one or more end faces of
Rubber core cord used by mixing with water ( 1 ) A solidifying agent containing a solidifying agent, which has the effect of solidifying water, and a swelling agent such as water and sodium bicarbonate, yeast powder, etc. (1b) Apply directly to the end including the rubber core end face ( 2 ) End and elastic cover ( 3 ) A step of forming the solidified portion porous by the action of an expanding agent while solidifying the ends of the
Material string (1b) Solidified part of (Ten) Cut the top flat and use a rubber cord ( 1 ) The step of obtaining
Rubber core cord ( 1 ) Water-insoluble adhesive on the cut end face ( 5 ) The cut end faces are joined with each other through the ( 5 ) And solidifies it, glues the end faces together, and puts a rubber cored cord ( 1 ) The process of connecting is included.
[0008]
Of the present inventionThe elastic band is formed by joining one or a plurality of rubber cored strings into a ring shape or a string shape by the above method.
[0009]
[Action and effect]
When the 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 of the material cord (1b) set by the solidifying agent is cut to obtain the cord (1) with a rubber core, the cut end surface of the cord (1) with a rubber core does not cause fluffing of the elastic cover (3). Also, a flat cut end surface can be obtained regardless of the difference in the material of the cord (3) and the rubber core (2).
Since the solidifying agent is directly applied to the end face of the material string (1b), the end face of the rubber core (2) and the end face of the elastic cover (3) can be securely solidified.
Moreover, since the flat cut surfaces of the rubber cored cord (1) are butted together via an adhesive and adhered, the adhesive strength can be improved.
[0010]
In the case of the present invention, it was confirmed by experiments that the bonding strength of the joint was superior to the conventional bonding method by about 5 times.
The applicant considers that the reason is that the adhesive penetrates into the end face of the rubber core (2) and hardens, thereby increasing the mechanical bonding force.
As is well known, rubber is a porous body having many fine pores.
When the solidifying agent is applied to the end surface including the end surface of the material string (1b), the water-soluble solidifying agent permeates into the fine pores of the rubber material from the end of the rubber core (2). When the solidifying agent dries, the rubber core (2) and the elastic cover (3) are solidified together at the end of the material string (1b), and at this time, the water and volatile components in the solidifying agent evaporate or vaporize. The dried solidifying agent becomes porous by leaving a large number of fine holes (41) due to their evaporation and vaporization. Further, gas is generated by the gas generating action of the expanding agent, and expands the pores (41) of the solidified solidifying agent (4).
When the solidified portions at both ends of the material string (1b) are cut in the range of the solidified portion to obtain the rubber cored cord (1), the expanded hole is formed at the end of the rubber cored cord (1). Part of (41) remains. When the cut surfaces are abutted with each other via the adhesive (5), the adhesive (5) penetrates into the holes (41) and solidifies, and this acts as a mechanical bond to bond the ring-shaped band. It is considered that the tensile strength of the joint was significantly improved.
As shown in FIG. 7, when the joint portion of the rubber cored cord is enlarged, a part of the adhesive bites into the inside from the end surface of the rubber core and solidifies.WasThe status 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 rubber cored cord (1) comprising a rubber core (2) and an elastic cover (3) covering the rubber core. And are bonded to each other. The adhesive joint (11) of the ring-shaped band is almost invisible in appearance. When the band is touched, there is only one hard part, which can be recognized as an adhesive joint.
[0012]
FIG. 2 shows a manufacturing process of the ring-shaped band.
FIG. 2A shows a long cord (1a) with a rubber core, which is a material of the 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 face of the long cord (1a) has a diameter of 4. It has a substantially circular shape of 5 mm.
The elastic cover (3) is formed by knitting, weaving or braiding a fiber yarn such as a cotton yarn or a synthetic fiber yarn in the length direction of the long cord (1a) so as to be able to cope with expansion and contraction of the rubber core (2). It is formed to be stretchable.
[0013]
As shown in FIG. 2B, the long string (1a) is cut into a length L1 slightly longer than the developed length L of the ring-shaped band to obtain a material string (1b).
The reason why the length of the material string (1b) is slightly longer than the developed length of the ring-shaped band is in order to correspond to the developed length of the ring-shaped band by cutting off both ends of the material string (1b) in a later step.
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 margin is 2.5 mm.
[0014]
As shown in FIG. 2C, a solidifying agent (4) is applied to both end surfaces of the material string (1b), and the rubber core (2) at the end and the elastic cover (3) are solidified integrally.
The solidifying agent (4) has been developed for the present invention, and as shown in FIG. 5, a large number of fine holes (41) (41) formed when the solidifying agent (4) is dried are enlarged. It is characterized in that it contains a pore expanding component.
The solidifying agent of the embodiment is used by mixing with water, a solidifying component that functions to integrally solidify the rubber core (2) of the cord (1) with a rubber core and the elastic cover (3), and water; Contains a swelling agent, which is a pore expanding component.
Using 60 cc of a polyvinyl alcohol-based paste (manufactured by Nippon Gosei Sangyo Co., Ltd.) as a solidifying component and 0.5 g of sodium bicarbonate as a swelling agent, these were dissolved in 40 cc of water to obtain a solidifying agent.
In the example, the tip of the material string (1b) was dipped in a container containing the solidifying agent by about 1 cm, and the solidifying agent (4) was applied so as to prevent application unevenness. As shown in FIG. 4, the solidifying agent (4) penetrates between the elastic cover (3) and the rubber core (2), the fibers of the elastic cover (3) and the fine pores of the rubber core (2). I do.
[0015]
The solidifying agent (4) is forcibly dried by applying warm air to the solidifying agent-attached portion. This is for shortening the drying time of the solidifying agent (4) and promoting 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. In practice, a number of rubber cored cords (1) were housed in a drying box so that the solidifying agents did not come into contact with each other, and the box was dried by supplying warm air. The temperature of the rubber cored cord (1) reached 70 ° C.
During the drying of the solidifying agent (4), water and volatile components in the solidifying agent evaporate or vaporize, and the dried solidifying agent has many fine pores (41) (41) due to the evaporation and vaporization. It remains and 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 pores (41) and (41) of the porous solidifying agent (4) to enlarge the pores.
[0016]
As shown in FIG. 2 (d), the solidified portions (10) (10) at both ends of the material string (1b) are cut perpendicular to the length direction of the material string (1b), and the developed length of the ring-shaped band is cut. A cord (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 integrally fixed is cut, the elastic cover (3) does not fluff on the cut end surface, and the string (3) and the rubber The cut is flat despite the difference in the material of the core (2).
[0017]
A non-water-soluble adhesive (5) is applied to one end face of the rubber cored cord (1), and the both end faces are butt-matched with their centers aligned, and pressure-bonded in the butt direction to bond.
Elastic cover (3), gap between cover (3) and rubber core (2) and end of rubber core (2)surfaceThe adhesive (5) penetrates into the enlarged holes (41) and (41) of the solidifying agent (4) which has penetrated and dried and became porous, and solidified. The adhesive that has permeated and solidified into the holes (41) plays a role of mechanically connecting the end faces of the cord (1) with a rubber core, and a strong joining force can be obtained.
There is no step in the outer peripheral portion of the adhesive bonding of the rubber cored cord (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 bonding portion. In addition, no swelling occurs in the adhesive joint, and the adhesive joint has a beautiful appearance indistinguishable from other parts.
[0018]
In the examples, a cyanoacrylate-based adhesive (trade name “Cyanobond RP-LX” manufactured by Taoka Chemical Industry Co., Ltd.), which has permeability and is quick-drying, was used.
The reason why the adhesive was applied only to one end face of the rubber cored cord (1) is that it is possible to obtain a sufficiently satisfactory adhesive force.
When the adhesive (5) is applied to both end surfaces of the rubber cored cord (1), a time lag occurs in the application, so that the end surface to which the adhesive is applied first is in a state where the adhesive is dry. There is a possibility that the adhesive strength is reduced due to contact with the adhesive on the mating end surface.
[0019]
Furthermore, when an adhesive is applied in an amount larger than a necessary amount, the adhesive is extruded to the outer peripheral portion of the end face and solidified, and protrudes as a burr from the outer periphery of the adhesive joint portion, which impairs aesthetic appearance.
Further, when the ring-shaped band is used for the hair, the burrs are caught on the hair. It is extremely troublesome to cleanly remove burrs generated by solidification of the adhesive in a subsequent process, which leads to an increase in cost.
In order to apply the adhesive (5) to the end face of the cord (1) with a rubber core, the adhesive may be dropped on 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 inside.
[0020]
In the ring-shaped band formed in the above process, the adhesive (5) penetrates into the holes (41) of the solidifying agent (4) at the adhesive joint and is solidified, and the solidifying agent becomes a powder and can escape to the outside. Although the amount is very small, the solidifying agent is dried and becomes whitish and remains on the surface of the elastic cover (3) near the adhesive joint. Depending on the color of the elastic cover (3) of the cord (1) with a rubber core, the remaining solidifying agent may make the band look 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 elastic cover (3). There is no need to wash the entire ring-shaped band with water, and only the adhesive joints need to be washed.
Since the washing is performed with water, the water-insoluble adhesive (5) that bonds the end faces of the rubber cored cords (1) to each other does not have an adverse effect such as a decrease in adhesive strength.
[0021]
Another embodiment of the solidifying agent
Examples of the solidifying component in the solidifying agent include, in addition to the polyvinyl alcohol-based paste, wheat flour, starch flour, new flour and the like. In the case of the present invention, the solidifying component can be rephrased as "a polymer material used by being mixed with water and having the property of solidifying the rubber cored cord (1)".
Examples of the swelling agent which is a pore expanding component contained in the solidifying agent include, in addition to sodium hydrogen carbonate, ammonium bicarbonate, ammonium chloride, ammonium carbonate, tartaric acid, potassium hydrogen tartrate, calcined alum, yeast powder, baking powder and the like. be able to. Further, the term "swelling agent" used in the present invention also includes those which should be rephrased as "blowing agent".
Instead of the swelling agent, a decomposing bacterium or a decomposing enzyme for the above-mentioned solidifying component, or an organic solvent-based detergent can be used.
The decomposing bacteria and the decomposing enzyme decompose the solidifying component and enlarge the pores (41) of the solidifying agent.
Examples of the decomposing bacteria and decomposing enzymes include yeast, brewer's yeast, koji mold, polyvinyl alcohol decomposing bacteria and the like.
[0022]
The organic solvent-based cleaning agent removes dirt, oil, and solidifying components that penetrate the fine pores inside the rubber from the end face of the rubber core and clog the pores, and the cleaning agent itself vaporizes. It has the function of leaving holes.
Examples of the organic solvent-based detergent include anone, methanol, methyl ethyl ketone, propylene dichloride, dichloromethane, tetrahydrofuran, toluene, n-heptane, acetone and the like.
[0023]
Therefore, the following can be mentioned as examples of mixing of the solidifying agent.
(A). Sodium bicarbonate + flour + water
(B). Sodium hydrogen carbonate + starch paste + water
(C). Sodium hydrogen carbonate + new powder + water
(D). Sodium bicarbonate + polyvinyl alcohol glue + water
(E). (A) to (d) in which sodium carbonate is replaced with yeast
(F). (A) to (e) wherein sodium hydrogencarbonate or yeast is replaced with a solidifying component-decomposing bacterium or a solidifying component-degrading enzyme
(G). (A) to (f) in which sodium bicarbonate, yeast, solidifying component-decomposing bacterium, or solidifying component-degrading enzyme is replaced with an organic solvent-based detergent
In the above mixing example, when yeast is used, it is desirable to add a trace amount of sugar. The sugar makes the yeast more active, and the pores (41) of the solidifying agent (4) can be made larger.
[0024]
Example 2
The solidifying component of the solidifying agent and the mixing ratio are different from those in Example 1, and the other components are the same as in Example 1.
The solidifying agent is a mixture of 20 g of flour, 80 cc of water, and 1 g of sodium hydrogen carbonate.
[0025]
Example 3
The second embodiment is different from the first embodiment in the solidifying agent and the drying process of the solidifying agent.
The solidifying agent was obtained by mixing 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. During that time, the yeast bacteria are activated, and the pores (41) of the solidifying agent (4) can be enlarged.
[0026]
Example 4
Example 3 is different from Example 3 in the compounding ratio of the solidifying agent, and the rest is the same as Example 3.
The solidifying agent was obtained by mixing 20 g of flour, 80 cc of water, and 2 g of yeast.
[0027]
Example 5
Examples of solidifying agents containing organic solvent-based cleaning agents.
Except for the solidifying agent, the same as in Example 1.
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.
Except for the solidifying agent, the same as in Example 1.
The solidifying agent is a mixture of 40 g of polyvinyl alcohol-based paste, 20 cc of acetone, and 2 g of sodium hydrogen carbonate.
[0029]
Tensile strength tests were performed on the ring-shaped band manufactured by the method of Examples 1 to 6 and the ring-shaped band manufactured by the method of
sample
100 samples each
All samples were adjusted to the thickness and size of the ring-shaped hand of Example 1.
The material and thickness of the rubber core, the thickness and the knitting method of the thread of the elastic cover were also the same.
Test method
A ring-shaped band is hung on the hook of a spring balance (Nakamura Seisakusho Co., Ltd., bar-shaped tension gauge "Pestool" maximum scale of 10 kg), and the lower end of the band is pulled vertically downward, and a rubber core or an elastic cover is used. At least one depends on the scale at the time of breakage.
The tensile strength of the adhesive joint of the products of Examples 1 to 6 exceeds the maximum scale of the used spring balance of 10 kg, and empirically seems to exceed 15 kg.
This was at least five times the conventional value, and the appearance was satisfactory.
[0031]
When the ring-shaped band is used as a head ornament, the maximum load applied to the band in an instant is 3.5 kg to 5 kg. The maximum tensile strength of the adhesive joint of the ring-shaped band according to the prior art is 2.3 kg, and the adhesive joint is easily broken if pulled slightly with use during use. Each of the products of the present application withstands 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 cord
In Example 1, both ends of the material string (1b) shown in FIG. 2D were cut to obtain a rubber core cord (1) having a length L corresponding to the developed length of the ring-shaped band. Thereafter, as shown in FIG. 8A, a hole (20) is opened at the center of both end surfaces of the rubber core (2) by a drill or the like.
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 surfaces of the rubber core (2), solidification with a solidifying agent and a step of forming a solidified portion to be porous are performed in the same manner as in Example 1, FIG. 2 (e). Through a bonding step at both ends of the rubber cored cord (1), a ring-shaped band is formed.
[0033]
As shown in FIG. 8B, an adhesive (5) for bonding both ends of the rubber cored cord (1) penetrates into the holes (21) and (21) of the rubber core (2) and is solidified. It plays the role of strengthening the adhesive bonding force between the end faces of the cord (1). In addition, since the adhesive (5) filled in the holes (20) and (20) becomes columnar and hardens, it is possible to prevent bending and misalignment at the joint.
[0034]
As shown in FIG. 9, it is also possible to insert a small joint reinforcing piece (6) across the holes (20) (20) at both end faces of the rubber core (2).
The small piece for joining reinforcement (6) is formed of hard rubber or synthetic resin, and has a length of 2 to 5 mm and a thickness of 0.5 to 1.2 mm.
One end of the small piece for bonding reinforcement (6) is inserted into the hole (20) on one end face of the rubber core (2) with approximately half of the entire length, and the other end is projected from the end face.
The same adhesive (5) as described above is applied to the other end surface of the rubber core (2).
The two ends of the rubber core (2) are butted and joined. When the end faces are abutted, approximately half of the joining reinforcing piece (6) projecting from one end face penetrates into the hole (21) on the other end face, and the joining reinforcing piece (6) is inserted into both holes (20). ) (20).
The adhesive (5) also penetrates into the gap between the hole (20) and the small bonding piece (6).
The small bonding piece (6) is buried across both holes (20) and (20) and is bonded to the hole surface, so that the bonding area can be increased and a physically larger bonding force can be obtained.
Further, in joining the two ends of the rubber cored cord (1), the small pieces (6) for reinforcing the joint serve to guide the end faces of the rubber cored cord (1) so as not to be displaced from each other. Become Furthermore, since the center of the butt end face is surely matched by the joining reinforcing piece (6), it is possible to manufacture a ring-shaped band having a uniform bonding force with no variation in strength.
[0035]
In practicing the present invention, the tip of the material string (1b) can be washed with an organic solvent-based cleaning agent before the solidifying agent is applied to the tip of the material string (1b).
Wax is used for the yarn constituting the elastic cover (3) at the time of manufacture. In the case of the material string (1b) of the above embodiment, the amount of wax is not so large, but depending on the amount of wax, the wax prevents penetration of the solidifying agent into the elastic cover (3). The higher the yarn, the more elaborate the design of the elastic cover (3), the greater the amount of wax 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 increase the permeability of the solidifying agent. In some cases, wax removal is essential.
[0036]
The description of the above embodiments is intended to explain the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof. Further, the configuration of each part of the present invention is not limited to the above-described embodiment, and it is needless to say that 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 immersion in a cationic (cationic) surfactant or a nonionic surfactant (among those obtained by adding ethylene oxide to an aliphatic amine). This surfactant can be used as an antistatic agent because it reduces the generation of static electricity, forms a film on the surface that easily absorbs water, and releases static electricity.
The step of immersing in the surfactant may be performed before the material string (1b) is cut into a predetermined length or after the adhesive bonding of the ends of the rubber core-containing string (1), and the order is not limited.
[0038]
In addition, the ring-shaped band can be sterilized.
As a method of the sterilization treatment, immersion in a cationic surfactant or a zwitterionic surfactant can be mentioned. Since this surfactant has a strong bactericidal property, it can be used as a disinfectant. These sterilization treatment steps may be performed before the rubber cored cord (1) is cut into a predetermined length or after the rubber cored cord (1) is bonded and bonded to each other at any end, and the order is not limited.
[0039]
Further, in each of the above embodiments, in the step of cutting and removing both ends of the material cord (1b) shown in FIG. 2D to obtain the cord (1) with a rubber core, the cut surface is the axis of the material cord (1b). It may be cut diagonally to the heart, for example, at 45 °. In this case, when the cut ends of both ends are cut parallel to each other and the rubber cored cord (1) is bent in a ring shape, the cut end faces are correctly overlapped without twisting the rubber cored cord (1). Like
As described above, if the end of the material string (1b) is cut obliquely with respect to the axis, the butting area of both cut end surfaces can be increased, and the adhesive effect by the adhesive can be enhanced.
[0040]
The rubber core-containing cord (1) has two rubber cores (2), and the elastic cover (3) has a plurality of thick yarns formed by bundling elastic fine yarns. Can also be implemented by a flat body formed by knitting so as to pass between the rubber cores (2).
The rubber core-containing cord (1) is composed of a rubber core (2) and an elastic cover (3) covering the rubber core, and if the requirement of elasticity is satisfied, the number of rubber cores (2) and the elastic cover The configuration is free, such as the type of yarn forming (3) and the shape of the cord (1) with a rubber core.
[0041]
Also, two rubber cored cords (1) can be bonded and bonded to form one cord-shaped elastic band.
The ends to be joined of each of the rubber cored cords (1) and (1) are solidified and made porous in the same steps as the above steps, the solidified portions are cut flat, and the cut end faces are joined with an adhesive. OK.
Similarly, three or more rubber cored cords (1) can be connected to one.
[0042]
Further, a dye can be added to the solidifying agent. By matching the dye to the color of the elastic cover (3), it is possible to hide the presence of a solidifying agent that dries and turns whitish.
[0043]
Incidentally, fibrous cords having no rubber core can also be bonded to each other. With the solidifying agent according to the present invention, the ends of the string may be hardened, the hardened portion may be cut, and the cut ends of the string may be butt-bonded with an adhesive to be bonded and bonded.
[Brief description of the drawings]
FIG. 1 is a plan view showing a cross section of a part of a ring-shaped band of the present embodiment.
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 the rubber cored cord broken in the axial direction.
FIG. 4 is a cross-sectional view showing a state in which a solidifying agent has penetrated into an end of a rubber cored cord.
FIG. 5 is a cross-sectional view showing a state in which water of a solidifying agent is evaporated to form fine holes.
FIG. 6 is a cross-sectional view showing a state where the hole is swollen by gas.
FIG. 7 is an enlarged cross-sectional view of an adhesive joint of a cord with a rubber core.
FIG. 8A is a cross-sectional view showing a state in which holes are opened at both ends of a rubber core, and FIG. 8B is a cross-sectional view of an adhesive bonding portion in which small pieces for bonding reinforcement are laid across two holes.
FIG. 9 is a cross-sectional view of an adhesive bonding portion in which a small piece for bonding reinforcement is buried between rubber cores.
[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 (8)
水と混合して用いられゴム芯入り紐 Rubber core cord used by mixing with water (( １1 )) を固める作用のある固化作用成分と、水と、炭酸水素ナトリウム、イーストパウダー等の膨張剤とを含む固化剤を、ゴム芯入りの材料紐A solidifying agent containing a solidifying agent, which has the effect of solidifying water, and a swelling agent such as water and sodium bicarbonate, yeast powder, etc. (1b)(1b) のゴム芯端面を含む端部に直接に塗布し、ゴム芯Apply directly to the end including the rubber core end face (( ２2 )) の端部と伸縮性カバーEnd and elastic cover (( ３3 )) の端部を一体に固めると共に膨張剤の作用によって固化部分を多孔質に形成する工程、A step of forming the solidified part porous by the action of an expanding agent while solidifying the ends of
材料紐 Material string (1b)(1b) の固化部分Solidified part of (10)(Ten) 上を平坦に切断して、ゴム芯入り紐Cut the top flat and use a rubber cord (( １1 )) を得る工程、The step of obtaining
ゴム芯入り紐 Rubber core cord (( １1 )) の切断端面に非水溶性の接着剤Water-insoluble adhesive on the cut end face (( ５5 )) を介して、切断端面どうしを突き合わせ、切断端面に表出する孔に該接着剤Through the cut end faces, and put the adhesive into the hole exposed on the cut end face. (( ５5 )) を浸透させて端面どうしを接着し、ゴム芯入り紐And glue the end faces together, a rubber cored cord (( １1 )) を繋ぐ工程を含む伸縮性バンドの製法。A method of manufacturing a stretchable band including a step of connecting the two.
水と混合して用いられゴム芯入り紐 Rubber core cord used by mixing with water (( １1 )) を固める作用のある固化作用成分と、水と、該固化作用成分に対する分解菌もしくは分解酵素を含む固化剤を、ゴム芯入りの材料紐A solidifying agent containing water and a solidifying agent containing a decomposing bacterium or a degrading enzyme for the solidifying agent, into a material string containing a rubber core; (1b)(1b) のゴム芯端面を含む端部に直接に塗布し、ゴム芯Apply directly to the end including the rubber core end face (( ２2 )) の端部と伸縮性カバーEnd and elastic cover (( ３3 )) の端部を一体に固めると共に、分解菌又は無分解酵素の作用によって固化部分に孔を形成する工程、A step of forming a hole in the solidified portion by the action of degrading bacteria or non-degrading enzymes,
材料紐 Material string (1b)(1b) の固化部分Solidified part of (10)(Ten) 上を平坦に切断して、ゴム芯入り紐Cut the top flat and use a rubber cord (( １1 )) を得る工程、The step of obtaining
ゴム芯入り紐 Rubber core cord (( １1 )) の切断端面に非水溶性の接着剤Water-insoluble adhesive on the cut end face (( ５5 )) を介して突き合わせ、切断面に表出する孔に該接着剤Through the hole and the adhesive exposed in the cut surface (( ５5 )) を浸透させて端面どうしを接着し、ゴム芯入り紐And glue the end faces together, a rubber cored cord (( １1 )) を繋ぐ工程を含む伸縮性バンドの製法。A method of manufacturing an elastic band including a step of connecting the elastic bands.
水と混合して用いられゴム芯入り紐 Rubber core cord used by mixing with water (( １1 )) を固める作用のある固化作用成分と、水と、有機溶剤系洗浄剤を含む固化剤を、ゴム芯入りの材料紐A solidifying agent containing water and an organic solvent-based cleaning agent (1b)(1b) のゴム芯端面を含む端部に直接に塗布し、ゴム芯Apply directly to the end including the rubber core end face (( ２2 )) の端部と伸縮性カバーEnd and elastic cover (( ３3 )) の端部を一体に固めると共に、有機溶剤系洗浄剤の作用によつて固化部分に孔を形成する工程、And forming a hole in the solidified portion by the action of an organic solvent-based detergent,
材料紐 Material string (1b)(1b) の固化部分Solidified part of (10)(Ten) を平坦に切断して、ゴム芯入り紐Is cut flat and the cord with rubber core is (( １1 )) を得る工程、The step of obtaining
ゴム芯入り紐 Rubber core cord (( １1 )) の切断端面に非水溶性の接着剤Water-insoluble adhesive on the cut end face (( ５5 )) を介して、切断端面どうしを突き合わせ、切断端面に表出する孔に該接着剤Through the cut end faces, and put the adhesive into the hole exposed on the cut end face. (( ５5 )) を浸透させて端面どうしを接着し、ゴム芯入り紐And glue the end faces together, a rubber cored cord (( １1 )) を繋ぐ工程を含む伸縮性バンドの製法。A method of manufacturing an elastic band including a step of connecting the elastic bands.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003200179A JP3560602B1 (en) | 2003-07-23 | 2003-07-23 | Stretchable band and method of bonding the band |
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| Application Number | Priority Date | Filing Date | Title |
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| JP2003200179A JP3560602B1 (en) | 2003-07-23 | 2003-07-23 | Stretchable band and method of bonding the band |
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| JP2005040173A JP2005040173A (en) | 2005-02-17 |
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| JP2003200179A Expired - Fee Related JP3560602B1 (en) | 2003-07-23 | 2003-07-23 | Stretchable band and method of bonding the band |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108001439A (en) * | 2017-12-31 | 2018-05-08 | 三橡股份有限公司 | A kind of rubber lanyard and preparation method thereof |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3160967U (en) * | 2010-04-30 | 2010-07-15 | 栄光通商株式会社 | Annular hair band with antistatic function |
| JP6026855B2 (en) * | 2012-11-06 | 2016-11-16 | 栄光通商株式会社 | Rubber ring and manufacturing method thereof |
| JP2015112445A (en) * | 2013-12-16 | 2015-06-22 | モリト株式会社 | Elastic string and usage of the same |
| JP6175551B1 (en) * | 2016-12-16 | 2017-08-02 | 栄光通商株式会社 | Rubber cored string bonding structure and rubber cored string bonding solidifying agent |
| KR102095686B1 (en) * | 2019-12-30 | 2020-03-31 | 김석윤 | Elastic band heat treatment device and cutting device and hair bands using the same |
| JP7347772B1 (en) * | 2023-04-28 | 2023-09-20 | 栄光通商株式会社 | Joining structure of rubber-cored string and joining method of rubber-cored string |
-
2003
- 2003-07-23 JP JP2003200179A patent/JP3560602B1/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108001439A (en) * | 2017-12-31 | 2018-05-08 | 三橡股份有限公司 | A kind of rubber lanyard and preparation method thereof |
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| JP2005040173A (en) | 2005-02-17 |
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