JP4450896B2

JP4450896B2 - Bottle stopper manufacturing

Info

Publication number: JP4450896B2
Application number: JP21940699A
Authority: JP
Inventors: 鐵之助上中
Original assignee: 上中硝子製造株式会社
Priority date: 1998-09-22
Filing date: 1999-08-03
Publication date: 2010-04-14
Anticipated expiration: 2019-08-03
Also published as: JP2000159248A

Description

【０００１】
【産業上の利用分野】
この発明は、例えば洋酒，薬剤，化粧水，調味料などの各種充填物が充填されるガラス瓶の瓶栓に関し、特に、この発明は、ガラス瓶の瓶口部に被せられる合成樹脂製の内栓部をガラス製の外装部に形成された凹部内へ嵌入して内栓部と外装部とを一体結合した瓶栓の製法に関する。
【０００２】
【従来の技術】
例えば、従来の洋酒などのガラス瓶は、図１６に示すように、瓶口部１０１ａを有するガラス製の瓶本体１０１と、瓶口部１０１aの内側へ嵌め込まれる瓶栓１０２とから成る。瓶栓１０２は、下面に軸部１０２ｂが一体形成されたガラス製の撮み部１０２ａと、前記軸部１０２ｂの外周面に嵌められたコルク製の栓体１０３とで構成される。
【０００３】
また、醤油差しに用いられるガラス瓶として、図１７に示すように、ガラス製の瓶本体１０１の瓶口部１０１ａへ、瓶口部１０１ａの内側へねじ込むようにガラス製の瓶栓１０４を被着するものが存在する。このガラス瓶では、瓶口部１０１ａの内周面にねじ１０５が形成されると共に、瓶栓１０４の外周面に、前記ねじ１０５と螺合するねじ１０６が形成される。
【０００４】
図１６のガラス瓶の場合、瓶栓１０２の栓体１０３に高価なコルク材が用いてあるので、材料費が嵩み、瓶栓１０２がコスト高になる、という問題がある。
図１７のガラス瓶の場合、瓶本体１０１と瓶栓１０４の双方がガラス製であるので、ガラス同志が直接接触して破損し易く、しかも、瓶口部１０１ａと瓶栓１０４との嵌合精度が出ないため、シール特性が悪い、という問題がある。
【０００５】
上記の問題を解消するため、出願人は、先般、図１８に示すような構造の瓶栓１１６を提案した。この瓶栓１１６は、瓶口部１１０の外周面に形成された外ねじ１１１に螺合する内ねじ１１２が内周面に形成された合成樹脂製の内栓部１１３を、ガラス製の外装部１１４に形成した凹部１１５内へ緊密に嵌入して、内栓部１１３と外装部１１４とを一体結合した構造のものである。
この瓶栓１１６によれば、合成樹脂の内栓部１１３が瓶口部１１０に接触するので、ガラス同志が直接接触することがなく、破損のおそれがない。また、内栓部１１３は合成樹脂の変形により瓶口部１１０の外周面の形状に倣うため、前記瓶栓１１６の内周面と瓶口部１１０の外周面との間の気密が保たれ、良好なシール特性が得られる。
【０００６】
【発明が解消しようとする課題】
しかしながら、上記構成の瓶栓１１６では、内栓部１１３と外装部１１４との結合強度が十分でない場合、内栓部１１３が外装部１１４の凹部１１５により抜け出る、という問題がある。この抜けを防止するには、内栓部１１３と外装部１１４との嵌合精度を高める必要があるが、寸法管理に手数がかかり、コスト高を招くおそれがある。また、内栓部１１３と外装部１１４とを接着剤により接合することも可能であるが、特に飲食物が充填されるガラス瓶では、接着剤の使用は避けるのが望ましい。
【０００７】
この発明は、上記問題に着目してなされたもので、合成樹脂製の内栓部とガラス製の外装部との間に、内栓部の抜けを防止する手段を形成して、内栓部と外装部との結合強度を高めた瓶栓の製法を提供することを目的とする。
【０００９】
【課題を解決するための手段】
この発明は、瓶の瓶口部に被せられる合成樹脂製の内栓部をガラス製の外装部に形成された凹部内へ嵌入して内栓部と外装部とを一体結合した瓶栓の製法であって、請求項１の発明にかかる瓶栓の製法は、外周面に凹溝が周設された合成樹脂製の内栓部を型成形する内栓部成形工程と、この内栓部の外形に適合する形状の凹部を有し、その凹部の開口端面に盛り上がり部分を有するガラス製の外装部を型成形する外装部成形工程と、前記外装部の盛り上がり部を加熱溶融させて凹部内へ導くことにより凹部の内周面の開口端の位置に突出部を一体に形成する抜止め形成工程と、前記内栓部を前記外装部の凹部内へ嵌入し、その嵌入時に前記突出部を凹溝内へ係入して、内栓部と外装部とを一体結合する結合工程とを実施して瓶栓を製造することを特徴とする。
【００１１】
請求項２の発明にかかる瓶栓の製法は、外周面に凹溝が周設された合成樹脂製の内栓部を型成形する内栓部成形工程と、この内栓部の外形に適合する形状の凹部を有し、その凹部の開口端面に盛り上がり部分を有するガラス製の外装部を型成形する外装部成形工程と、前記外装部の盛り上がり部を加熱溶融させて凹部内へ導くことにより凹部の内周面の開口端の位置に第１の突出部を一体に形成する第１の抜止め形成工程と、前記外装部の開口端を加圧することにより凹部の内周面の第１の突出部より奥の位置に第２の突出部を一体に形成する第２の抜止め形成工程と、前記内栓部を前記外装部の凹部内へ嵌入し、その嵌入時に第１の突出部を凹溝内へ係入しかつ前記第２の突出部を内栓部の外周面に緊密嵌合して、内栓部と外装部とを一体結合する結合工程とを実施して瓶栓を製造することを特徴とする。
【００１３】
請求項３の発明にかかる瓶栓の製法は、外周面に凹溝が周設されかつ突起部が一体に形成された合成樹脂製の内栓部を型成形する内栓部成形工程と、この内栓部の外形に適合する形状の凹部を有し、その凹部の開口端面には盛り上がり部分、凹部の内周面には窪み部を有するガラス製の外装部を型成形する外装部成形工程と、前記外装部の盛り上がり部を加熱溶融させて凹部内へ導くことにより凹部の内周面の開口端の位置に突出部を一体に形成する抜止め形成工程と、前記内栓部を前記外装部内の凹部内へ嵌入し、その嵌入時に前記突出部を凹溝内へ係入しかつ前記窪み部に突起部を係入して、内栓部と外装部とを一体結合する結合工程とを実施して瓶栓を製造する。
【００１４】
【作用】
請求項１の発明にかかる瓶栓では、内栓部を外装部の凹部内へ嵌入して内栓部と外装部とを一体結合する際、凹部の内周面に形成された抜止めが内栓部の外周面に周設された凹溝に係合するので、内栓部が外装部の凹部より抜け出るのを阻止できる。
【００１５】
請求項２の発明にかかる瓶栓では、内栓部を外装部の凹部内へ嵌入して内栓部と外装部とを一体結合する際、凹部の内周面に形成された第１の突出部が内栓部の外周面に周設された凹溝に係合し、第２の突出部が内栓部の外周面に緊密に嵌合するので、内栓部が外装部の凹部より抜け出るのを阻止できる。
【００１６】
請求項３の発明にかかる瓶栓では、内栓部を外装部の凹部内へ嵌入して内栓部と外装部とを一体結合する際、凹部の内周面に形成された突出部が内栓部の外周面に周設された凹溝に係合し、また、凹部の内周面に形成された窪み部に内栓部の外周面に形成された突起部が係合するので、内栓部が外装部の凹部より抜け出るのを阻止できる。
【００１７】
【実施例】
図１は、この発明が実施されたガラス瓶１の外観を、図２は、ガラス瓶１の全体構造を、それぞれ示す。図示例のガラス瓶１は、洋酒瓶に用いられるが、この発明は、洋酒に限らず、薬品、化粧水、調味料などを充填するためのガラス瓶にも適用実施できる。
【００１８】
図示例のガラス瓶１は、瓶口部２０を有する全体がガラス製の瓶本体２と、この瓶本体２の瓶口部２０の外周面を覆うように瓶口部２０に着脱可能に被せられる瓶栓３とから成る。前記瓶本体２の瓶口部２０の先端部には、外ねじ２１が外周面に形成されている。
【００１９】
図３〜図５は、前記瓶栓３の構成を示す。
図示例の瓶栓３は、上面部４１を有する円筒形状の内栓部４と、この内栓部４の外周面に嵌合される外装部５とから成る。内栓部４はアクリルなどの合成樹脂製であり、外装部５はガラス製である。
【００２０】
前記内栓部４の内周面には、瓶口部２０の外ねじ２１に螺合する内ねじ４０が形成される。内栓部４の外周面には、開口端の近傍位置に、凹溝４２が一周形成され、上面部４１寄りには、係合溝４３が９０度等角の各位置に形成される。
【００２１】
前記外装部５は、内栓部４の外形に適合する形状の凹部５０を有し、この凹部５０内へ内栓部４を嵌入して、内栓部４と外装部５とが一体結合される。
外装部５の凹部５０の内周面には、９０度等角の各位置に、内栓部４の各係合溝４３と係合する係合突起５１が一体形成されており、内栓部４を外装部５の凹部５０へ嵌入する際、各係合溝４３と各係合突起５１とを係合させることにより、内栓部４に対する外装部５の空転が防止される。
なお、内栓部４の外形を角型や楕円型に形成し、一方、外装部５の凹部５０を内栓部４の外形に対応する形状とすることによっても、外装部５の空転を防止することができる。
【００２２】
外装部５の凹部５０の内周面には、開口端の位置に、内栓部４の凹溝４２と係合する内向きの突出部５２が一体形成されており、内栓部４を外装部５の凹部５０へ嵌入する際、凹溝４２と突出部５２とを係合させることにより、外装部５の凹部５０より内栓部４が抜け出るのを防止する。
【００２３】
上記した構成の瓶栓３を製作するには、内周面に内ねじ４０、外周面に凹溝４２および複数の係合溝４３を有する内栓部４を合成樹脂材により型成形する一方、凹部５０の内周面に複数の係合突起５１、開口端面に図６に示すような盛り上がり部分５３を有する外装部５をガラス材により型成形する。前記盛り上がり部分５３は、外装部５の開口端面の内周縁に沿って一周形成される。この実施例では、盛り上がり部分５３を突起状に形成してあるが、これに限らず、図７に示すように、テーパ状に形成してもよい。
【００２４】
次に、外装部５の盛り上がり部５３に対して、外装部５を軸回転させながらバーナによる直火を外側より作用させて、１１００〜１２００度で加熱することにより、盛り上がり部５３を全周にわたって溶融する。この溶融ガラスは直火の圧力により凹部５０内へ流れ込み、凹部５０の内周面の開口端の位置で冷却固化することにより、抜止めを構成する前記突出部５２が形成される。
【００２５】
以上の工程を経て形成された外装部５の凹部５０内へ内栓部４を嵌入し、その嵌入時に前記突出部５２を凹溝４２内へ係入して、内栓部４と外装部５とを一体結合し、瓶栓３を完成させる。
内栓部４を外装部５の凹部５０内へ嵌入する際、凹部５０の内周面に形成された突出部５２と内栓部４の外周面に周設された凹溝４２とが係合するので、内栓部４が外装部５の凹部５０より抜け出るのが阻止される。
【００２６】
なお、内栓部４および外装部５は、上記実施例の形状のものに限定されるものではなく、用途や瓶本体２の瓶口部２０の形状などに応じて種々の形状に形成することができ、また、種々のデザインを付与することができる。
【００２７】
図８に示す実施例は、前記外装部５の凹部５０の内周面の開口端の位置に、図３に示した実施例の突出部５２と同様の構成の第１の突出部５２が、この第１の突出部５２の奥の位置に、外装部５の凹部５０の内周面を膨出させた第２の突出部６２が、それぞれ一体に形成されたものである。
【００２８】
この実施例における第２の突出部６２は、突出量が小さい扁平形状であるので、内栓部４を外装部５の凹部５０内へ嵌入する際、内栓部４の外周面を押圧して食い込むように緊密嵌合するが、突出量が大きい場合には、内栓部４の外周面に第２の突出部６２が係合する凹溝を周設してもよい。
なお、この実施例の他の構成は、図３に示した実施例と同様であり、ここでは、対応する構成に同一の符号を付することで詳細は説明を省略する。
【００２９】
図８に示す構成の瓶栓３を製作するには、内周面に内ねじ４０、外周面に凹溝４２および複数の係合溝４３を有する内栓部４を合成樹脂材により型成形する一方、凹部５０の内周面に複数の係合突起５１、開口端面に図７に示すようなテーパ状の盛り上がり部分５３を有する外装部５をガラス材により型成形する。前記盛り上がり部分５３は、外装部５の開口端面の内周縁に沿って一周形成される。
【００３０】
次に、外装部５の盛り上がり部５３に対して、外装部５を軸回転させながらバーナによる直火を外側より作用させて、１１００〜１２００度で加熱することにより、盛り上がり部５３を全周にわたって溶融する。この溶融ガラスは直火の圧力により凹部５０内へ流れ込み、凹部５０の内周面の開口端の位置で冷却固化することにより、第１の突出部５２が形成される。
溶融ガラスが凹部５０内に流れ込んだ直後に、図９に示すように、前記外装部５の開口端に加圧板６３を押し付けて加圧する。この時点では、外装部５の開口端面や内周面は前記加熱処理により軟化しているので、前記加圧作用を受けて第１の突出部５２より奥の位置が盛り上がって膨出し、第２の突出部６２が形成される。なお、加圧板６３は図示のように下方へ移行させて押圧してもよく、上方へ移行させて押圧してもよい。
【００３１】
以上の工程を経て形成された外装部５の凹部５０内へ内栓部４を嵌入し、その嵌入時に第１の突出部５２を凹溝４２内へ係入させかつ第２の突出部６２を内栓部４の外周面に食い込ませるように緊密嵌合させて、内栓部４と外装部５とを一体結合し、瓶栓３を完成させる。
このように、内栓部４を外装部５の凹部５０内へ嵌入する際、凹部５０の内周面に形成された第１の突出部５２と内栓部４の外周面に周設された凹溝４２とが係合しかつ第２の突出部６２が内栓部４の外周面に緊密嵌合するので、内栓部４が外装部５の凹部５０より抜け出るのが阻止される。
【００３２】
図１０および図１１に示す実施例は、前記外装部５の凹部５０の内周面の開口端の位置に、図３に示した実施例の突出部５２や図８に示した実施例の第１の突出部５２と同様の構成の突出部５２が一体に形成されるとともに、前記突出部５２より奥の９０度等角の位置に、４個の窪み部６４を形成したものである。一方、内栓部４の外周面には前記突出部５２が係合する凹溝４２が形成されるとともに、各窪み部６４と係合する４個の突起部６５が一体に形成されている。
なお、この実施例の他の構成も、図３に示した実施例と同様であり、ここでは、対応する構成に同一の符号を付することで説明を省略する。
【００３３】
図１０に示す構成の瓶栓３を製作するには、内周面に内ねじ４０、外周面に凹溝４２、複数の係合溝４３、および４個の突起部６５を有する内栓部４を合成樹脂材により型成形する。一方、凹部５０の内周面に複数の係合突起５１および４個の窪み部６４、開口端面に前記したテーパ状の盛り上がり部分５３を有する外装部５をガラス材により型成形する。前記盛り上がり部分５３は、外装部５の開口端面の内周縁に沿って一周形成される。
【００３４】
図１２は、外装部５の内周面に４個の窪み部６４を形成する具体的な方法を示す。
同図において、６９は外装部５の外形を成形するための成形型、７０は外装部５の凹部５０を成形するためのプランジャである。このプランジャ７０の内部に空気、水、油など（以下、「空気等」という。）を導入するための導入路７１が形成されている。この導入路７１は、四方へ延びかつプランジャ７０の外周面に開口する分岐通路７２を有する。各分岐通路７２には、ピン７３と各ピン７３を支持する引張ばね７４とがそれぞれ配備されている。各ピン７３は常時は分岐通路７２内に退避しているが、導入路７１へ空気等が送り込まれたとき、各ピン７３の先端部がプランジャ７０の外周面より突出し、外装部５の成形体の内周面に押し付けられて前記窪み部６４が形成される。空気等の送込みが停止されると、各ピン７３は引張ばね７４のばね力で各分岐通路７２内に引っ込む。
【００３５】
各分岐通路７２には、通路幅を拡張して形成されたガイド部７６を有する。このガイド部７６にピン７３の鍔状部７７が往復動可能に係合させてある。前記ガイド部７６は、ピン７３の往復動のストロークを規定する。
なお、上記実施例では、各ピン７３は空気等の圧力を作用させて動作させているが、これに限らず、機械的に動作させるようにしてもよい。
また、窪み部６４は、上記したピン７３を往復動させる方法以外の方法で形成することも可能である。さらに、窪み部６４の数は、この実施例のように、必ずしも４個である必要はなく、３個以下、或いは５個以上であってもよい。
【００３６】
外装部５を型成形する工程が完了すると、次に、外装部５の盛り上がり部５３に対して、外装部５を軸回転させながらバーナによる直火を外側より作用させて、１１００〜１２００度で加熱することにより、盛り上がり部５３を全周にわたって溶融する。この溶融ガラスは直火の圧力により凹部５０内へ流れ込み、凹部５０の内周面の開口端の位置で冷却固化することにより、突出部５２が形成される。
【００３７】
以上の工程を経て形成された外装部５の凹部５０内へ内栓部４を嵌入し、その嵌入時に突出部５２を凹溝４２内へ係入させかつ各窪み部６４内に突起部６５を係入させて、内栓部４と外装部５とを一体結合し、瓶栓３を完成させる。
【００３８】
図１３に示す実施例は、内栓部４の開口端の外周面に鍔状部４４を一体形成し、外装部５の開口端面を前記鍔状部４４で覆うようにしたものである。
この実施例によれば、瓶本体２の瓶口部２０が短いような場合、瓶口部２０に瓶栓３が被着されたとき、合成樹脂製の内栓部４の鍔状部４４が瓶本体２０に接触するので、ガラス同志の接触が防止される。なお、この実施例では、回り止め機能を強化するために、外装部５の開口端面に複数の半球状突子５５を突設し、一方、内栓部４の鍔状部４４の上面に各突子５５が嵌まる穴４５が形成してある。
【００３９】
上記の各実施例は、瓶栓３を瓶本体２の瓶口部２０にねじ込む構成のものであるが、このねじ止め構造に代えて、図１４および図１５に示すような、他の止め構造を採択することもできる。
【００４０】
図示例の止め構造は、瓶口部２０の先端に形成される鍔板部２５と、瓶栓３の内栓部４の内周面に形成される一対の係止片４５ａ，４５ｂとで構成される。前記瓶口部２０の鍔板部２５は、瓶口部２０の外形より外周方向へ張り出しており、その対角位置には、所定の角度範囲にわたる切欠２６ａ，２６ｂが開設されている。
前記内栓部４の各係止片４５ａ，４５ｂは、開口端の内周面の対角位置に突設されており、各切欠２６ａ，２６ｂよりやや小さな角度範囲に形成される。
【００４１】
この実施例における瓶栓３で瓶口部２０を塞ぐには、瓶栓３の各係止片４５ａ，４５ｂを瓶口部２０の各切欠２６ａ，２６ｂに対応位置させた後、瓶栓３を瓶口部２０へ押し当てる。これにより各係止片４５ａ，４５ｂは、切欠２６ａ，２６ｂを通って鍔板部２５の下方へ入り込み、この状態で瓶栓３をいずれかの方向へ回すことにより、各係止片４５ａ，４５ｂが鍔板部２５に下面に係合して、瓶栓３が瓶口部２０に固定される。
【００４２】
【発明の効果】
この発明により製造される瓶栓は、外装部の凹部の内周面に、抜止めを構成する突出部が開口端の位置に一体に形成されるとともに、内栓部の外周面には、前記突出部と係合する凹溝が周設されているから、内栓部が外装部の凹部から抜け出るのを防止でき、内栓部と外装部との結合強度が高められるもので、この発明の瓶栓の製法によると、外装部の開口端面に盛り上がり部分を予め形成し、この盛り上がり部分を加熱溶融させて、凹部の内周面の開口端の位置に、突出部を形成するから、ガラス製の外装部の内周面に突出部を容易に形成できる。
【００４３】
請求項２の発明より製造される瓶栓は、外装部の内周面に上記した突出部に加えて第２の突出部を形成し、また、請求項３の発明より製造される瓶栓は、外装部の内周面に窪み部、内栓部の外周面に窪み部に係合する突起部を形成したから、内栓部と外装部との結合強度が一層高められ、内栓部が外装部の凹部から抜け出るのを一層確実に防止できるもので、請求項２の発明では、外装部の開口端を加圧することにより凹部の内周面に第２の突出部を一体に形成するから、ガラス製の外装部の内周面に第２の突出部を容易に形成でき、請求項３の発明では、外装部を型成形する外装部成形工程において窪み部を形成するから、ガラス製の外装部の内周面に窪み部を容易に形成できる、という効果がある。
【図面の簡単な説明】
【図１】この発明が実施されたガラス瓶の外観を示す斜視図である。
【図２】図１のガラス瓶の一部を破断した正面図である。
【図３】瓶栓の構造を示す断面図である。
【図４】図３のＡ−Ａ線に沿う断面図である。
【図５】瓶栓を下方より見た底面図である。
【図６】予め形成された盛り上がり部分を有する外装部の断面図である。
【図７】盛り上がり部分の他の実施例を示す外装部の断面図である。
【図８】瓶栓の他の実施例を示す断面図である。
【図９】外装部に突出部を形成する方法を示す断面図である。
【図１０】瓶栓の他の実施例を示す断面図である。
【図１１】図１０のＢ−Ｂ線に沿う断面図である。
【図１２】窪み部を形成する方法の具体例を示す断面図である。
【図１３】瓶栓の他の実施例を示す断面図である。
【図１４】瓶栓の瓶口部への他の止め構造を示す断面図である。
【図１５】図１４の止め構造を示す斜視図である。
【図１６】従来の瓶栓の構成を示す断面図である。
【図１７】従来の他の瓶栓の構成を示す断面図である。
【図１８】従来の他の瓶栓の構成を示す断面図である。
【符号の説明】
１瓶
２瓶本体
２０瓶口部
３瓶栓
４内栓部
４２凹溝
５外装部
５０凹部
５２突出部
６２第２の突出部
６４窪み部
６５突起部[0001]
[Industrial application fields]
The present invention relates to a glass bottle cap that is filled with various fillers such as western liquor, medicine, lotion, seasoning, etc., and in particular, the present invention relates to an inner cap portion made of a synthetic resin that covers the bottle mouth of the glass bottle. The present invention relates to a method of manufacturing a bottle cap in which the inner plug portion and the exterior portion are integrally coupled by fitting the material into a recess formed in a glass exterior portion .
[0002]
[Prior art]
For example, as shown in FIG. 16, a conventional glass bottle for Western liquor is composed of a glass bottle body 101 having a bottle mouth portion 101a and a bottle stopper 102 fitted inside the bottle mouth portion 101a. The bottle stopper 102 includes a glass photographing part 102a in which a shaft part 102b is integrally formed on the lower surface, and a cork stopper 103 fitted to the outer peripheral surface of the shaft part 102b.
[0003]
Moreover, as a glass bottle used for a soy sauce container, as shown in FIG. 17, the glass bottle stopper 104 is attached to the bottle mouth part 101a of the glass bottle body 101 so as to be screwed into the inside of the bottle mouth part 101a. Things exist. In this glass bottle, a screw 105 is formed on the inner peripheral surface of the bottle mouth portion 101 a, and a screw 106 that is screwed with the screw 105 is formed on the outer peripheral surface of the bottle cap 104.
[0004]
In the case of the glass bottle of FIG. 16, since the expensive cork material is used for the stopper 103 of the bottle stopper 102, there is a problem that the material cost increases and the bottle stopper 102 becomes expensive.
In the case of the glass bottle of FIG. 17, since both the bottle body 101 and the bottle stopper 104 are made of glass, the glass members are easily brought into direct contact and are easily damaged, and the fitting accuracy between the bottle mouth portion 101a and the bottle stopper 104 is high. Since it does not come out, there is a problem that the sealing characteristics are poor.
[0005]
In order to solve the above problem, the applicant has recently proposed a bottle stopper 116 having a structure as shown in FIG. The bottle stopper 116 is formed by replacing the inner stopper portion 113 made of a synthetic resin having an inner screw 112 formed on the inner peripheral surface with an outer screw 111 formed on the outer peripheral surface of the bottle mouth portion 110. The inner plug portion 113 and the exterior portion 114 are integrally coupled by tightly fitting into a recess 115 formed in 114.
According to this bottle stopper 116, since the inner stopper portion 113 of the synthetic resin comes into contact with the bottle mouth portion 110, the glass members are not in direct contact with each other, and there is no risk of breakage. Further, since the inner stopper portion 113 follows the shape of the outer peripheral surface of the bottle mouth portion 110 due to the deformation of the synthetic resin, airtightness between the inner peripheral surface of the bottle stopper 116 and the outer peripheral surface of the bottle mouth portion 110 is maintained. Good sealing properties can be obtained.
[0006]
[Problems to be solved by the invention]
However, the bottle plug 116 configured as described above has a problem in that the inner plug portion 113 is pulled out by the concave portion 115 of the outer portion 114 when the coupling strength between the inner plug portion 113 and the outer portion 114 is not sufficient. In order to prevent this disconnection, it is necessary to increase the fitting accuracy between the inner plug portion 113 and the exterior portion 114, but it takes time to manage the dimensions and may increase the cost. In addition, it is possible to join the inner plug portion 113 and the exterior portion 114 with an adhesive, but it is desirable to avoid the use of an adhesive, particularly in a glass bottle filled with food and drink.
[0007]
This invention has been made in consideration of the above problems, between the inner plug part and the glass exterior portion made of a synthetic resin, to form a means for preventing escape of the inner plug portion, the inner plug portion It aims at providing the manufacturing method of the bottle stopper which raised the joint strength with the exterior part.
[0009]
[Means for Solving the Problems]
The present invention relates to a method for producing a bottle cap in which an inner plug portion made of a synthetic resin covering a bottle mouth portion of a bottle is inserted into a recess formed in a glass exterior portion, and the inner stopper portion and the exterior portion are integrally coupled. The bottle stopper manufacturing method according to the first aspect of the present invention includes an inner plug portion molding step of molding an inner plug portion made of a synthetic resin having a concave groove formed on the outer peripheral surface, An exterior part forming step of molding a glass exterior part having a recessed part conforming to the outer shape and having a raised part on the opening end surface of the recessed part, and the raised part of the exterior part is heated and melted into the recessed part A retaining forming step of integrally forming a protruding portion at the position of the opening end of the inner peripheral surface of the concave portion by guiding, and inserting the inner plug portion into the concave portion of the exterior portion. The bottle stopper is manufactured by engaging in the groove and carrying out a joining step for integrally joining the inner stopper portion and the exterior portion. The features.
[0011]
The manufacturing method of the bottle stopper according to the invention of claim 2 is adapted to an inner plug portion molding step of molding an inner plug portion made of synthetic resin having a concave groove formed on the outer peripheral surface, and an outer shape of the inner plug portion. An exterior part molding step of molding a glass exterior part having a shape-shaped recess and having a raised part on the opening end face of the recess, and the recessed part by heating and melting the raised part of the exterior part into the recess A first retaining formation step of integrally forming the first protrusion at the position of the opening end of the inner peripheral surface of the inner peripheral surface, and the first protrusion of the inner peripheral surface of the recess by pressurizing the opening end of the exterior portion A second retaining forming step in which a second protrusion is integrally formed at a position deeper than the portion, and the inner plug is inserted into the recess of the exterior portion, and the first protrusion is recessed at the time of the insertion. fitted tightly on the outer circumferential surface of the inner plug portion engaged vital said second protrusion into the groove, integrally with the inner plug part and the exterior part Characterized in that to produce a bottle stopper to implement a coupling step of coupling.
[0013]
According to a third aspect of the present invention, there is provided a bottle stopper manufacturing method comprising: molding an inner stopper portion made of a synthetic resin in which a concave groove is provided on an outer peripheral surface and a protrusion is integrally formed; An exterior portion molding step of molding a glass exterior portion having a concave portion that conforms to the outer shape of the inner plug portion, a raised portion on the opening end face of the recess portion, and a recessed portion on the inner peripheral surface of the recess portion; A retaining formation step of integrally forming a protruding portion at the position of the opening end of the inner peripheral surface of the recess by heating and melting the raised portion of the exterior portion into the recess, and the inner plug portion in the exterior portion And inserting the protruding portion into the recessed groove and engaging the protruding portion into the recessed portion to integrally connect the inner plug portion and the exterior portion. To produce a bottle cap.
[0014]
[Action]
In the bottle cap according to the first aspect of the present invention, when the inner plug portion is fitted into the recess portion of the exterior portion and the inner stopper portion and the exterior portion are integrally coupled, the retaining formed on the inner peripheral surface of the recess portion is Since it engages with the concave groove provided on the outer peripheral surface of the plug portion, the inner plug portion can be prevented from coming out of the concave portion of the exterior portion.
[0015]
In the bottle cap according to the invention of claim 2 , the first protrusion formed on the inner peripheral surface of the concave portion when the inner plug portion is fitted into the concave portion of the outer portion and the inner plug portion and the outer portion are integrally coupled. Since the portion engages with a concave groove provided on the outer peripheral surface of the inner plug portion, and the second projecting portion closely fits with the outer peripheral surface of the inner plug portion, the inner plug portion comes out of the concave portion of the exterior portion. Can be prevented.
[0016]
In the bottle stopper according to the invention of claim 3 , when the inner plug portion is fitted into the recess portion of the exterior portion and the inner plug portion and the exterior portion are integrally coupled, the protruding portion formed on the inner peripheral surface of the recess portion is the inner portion. Engage with the recessed groove provided on the outer peripheral surface of the stopper, and the protrusion formed on the outer peripheral surface of the inner stopper engages with the recess formed on the inner peripheral surface of the recess. It is possible to prevent the plug portion from coming out of the concave portion of the exterior portion.
[0017]
【Example】
FIG. 1 shows the appearance of a glass bottle 1 in which the present invention is implemented, and FIG. 2 shows the overall structure of the glass bottle 1. Although the illustrated glass bottle 1 is used for a sake bottle, the present invention is not limited to western sake, and can be applied to a glass bottle for filling chemicals, lotions, seasonings, and the like.
[0018]
The glass bottle 1 in the illustrated example has a bottle mouth portion 20 that is entirely covered with the bottle mouth portion 20 so as to cover the bottle body portion 2 made of glass and the outer peripheral surface of the bottle mouth portion 20 of the bottle body 2. It consists of a stopper 3. An outer screw 21 is formed on the outer peripheral surface of the bottle mouth portion 20 of the bottle body 2.
[0019]
3 to 5 show the configuration of the bottle cap 3.
The bottle stopper 3 in the illustrated example includes a cylindrical inner stopper portion 4 having an upper surface portion 41 and an exterior portion 5 fitted to the outer peripheral surface of the inner stopper portion 4. The inner plug portion 4 is made of a synthetic resin such as acrylic, and the exterior portion 5 is made of glass.
[0020]
On the inner peripheral surface of the inner stopper portion 4, an inner screw 40 that is screwed into the outer screw 21 of the bottle mouth portion 20 is formed. A concave groove 42 is formed around the outer peripheral surface of the inner plug portion 4 in the vicinity of the opening end, and an engagement groove 43 is formed at each 90 ° equiangular position near the upper surface portion 41.
[0021]
The exterior portion 5 has a recess 50 having a shape that fits the outer shape of the inner plug portion 4. The inner plug portion 4 is fitted into the recess 50, and the inner plug portion 4 and the exterior portion 5 are integrally coupled. The
Engagement protrusions 51 that engage with the respective engagement grooves 43 of the inner plug portion 4 are integrally formed on the inner peripheral surface of the recess 50 of the exterior portion 5 at respective positions that are equiangular at 90 degrees. When 4 is inserted into the recess 50 of the exterior portion 5, the engagement grooves 43 and the engagement protrusions 51 are engaged to prevent the exterior portion 5 from slipping relative to the inner plug portion 4.
The outer shape of the inner plug portion 4 is formed in a square shape or an oval shape, and the recess portion 50 of the outer portion 5 is formed in a shape corresponding to the outer shape of the inner plug portion 4 to prevent the outer portion 5 from slipping. can do.
[0022]
On the inner peripheral surface of the concave portion 50 of the exterior portion 5, an inward protruding portion 52 that engages with the concave groove 42 of the inner plug portion 4 is integrally formed at the position of the opening end. When fitting into the recess 50 of the part 5, the inner groove part 4 is prevented from coming out of the recess 50 of the exterior part 5 by engaging the groove 42 and the protrusion 52.
[0023]
In order to manufacture the bottle cap 3 having the above-described configuration, the inner plug portion 4 having the inner screw 40 on the inner peripheral surface and the concave groove 42 and the plurality of engaging grooves 43 on the outer peripheral surface is molded with a synthetic resin material, The exterior portion 5 having a plurality of engaging projections 51 on the inner peripheral surface of the recess 50 and a raised portion 53 as shown in FIG. 6 on the opening end surface is molded from a glass material. The raised portion 53 is formed around the inner peripheral edge of the opening end surface of the exterior portion 5. In this embodiment, the raised portion 53 is formed in a protruding shape, but the present invention is not limited to this, and it may be formed in a tapered shape as shown in FIG.
[0024]
Next, the flared portion 53 of the exterior portion 5 is heated at 1100 to 1200 degrees by causing a direct fire from the burner to act on the outside while rotating the exterior portion 5 about the axis, so that the bulge portion 53 is spread over the entire circumference. Melt. The molten glass flows into the concave portion 50 by the pressure of direct fire, and is cooled and solidified at the position of the opening end of the inner peripheral surface of the concave portion 50, thereby forming the protruding portion 52 constituting the retaining.
[0025]
The inner plug portion 4 is inserted into the concave portion 50 of the exterior portion 5 formed through the above steps, and at the time of the insertion, the protruding portion 52 is engaged into the concave groove 42, and the inner plug portion 4 and the exterior portion 5 are inserted. And the bottle cap 3 are completed.
When the inner plug portion 4 is fitted into the concave portion 50 of the exterior portion 5, the protrusion 52 formed on the inner peripheral surface of the concave portion 50 engages with the concave groove 42 provided around the outer peripheral surface of the inner plug portion 4. Therefore, the inner plug portion 4 is prevented from coming out of the concave portion 50 of the exterior portion 5.
[0026]
In addition, the inner stopper part 4 and the exterior part 5 are not limited to the shape of the said Example, It forms in various shapes according to a use, the shape of the bottle mouth part 20 of the bottle main body 2, etc. In addition, various designs can be given.
[0027]
In the embodiment shown in FIG. 8, the first protrusion 52 having the same configuration as the protrusion 52 of the embodiment shown in FIG. 3 is located at the position of the opening end of the inner peripheral surface of the recess 50 of the exterior portion 5. Second protrusions 62 bulging the inner peripheral surface of the recess 50 of the exterior part 5 are integrally formed at a position behind the first protrusion 52.
[0028]
Since the 2nd protrusion part 62 in this Example is a flat shape with small protrusion amount, when inserting the inner stopper part 4 in the recessed part 50 of the exterior part 5, the outer peripheral surface of the inner stopper part 4 is pressed. Although the tight fitting is performed so that the protrusion is large, a concave groove that engages with the second protrusion 62 may be provided on the outer peripheral surface of the inner plug portion 4 when the protrusion amount is large.
The other configuration of this embodiment is the same as that of the embodiment shown in FIG. 3. Here, the same reference numerals are assigned to the corresponding components, and the detailed description thereof is omitted.
[0029]
In order to manufacture the bottle cap 3 having the configuration shown in FIG. 8, the inner plug portion 4 having the inner screw 40 on the inner peripheral surface and the concave groove 42 and the plurality of engaging grooves 43 on the outer peripheral surface is molded from a synthetic resin material. On the other hand, the exterior portion 5 having a plurality of engaging protrusions 51 on the inner peripheral surface of the recess 50 and a tapered raised portion 53 as shown in FIG. The raised portion 53 is formed around the inner peripheral edge of the opening end surface of the exterior portion 5.
[0030]
Next, the flared portion 53 of the exterior portion 5 is heated at 1100 to 1200 degrees by causing a direct fire from the burner to act on the outside while rotating the exterior portion 5 about the axis, so that the bulge portion 53 is spread over the entire circumference. Melt. The molten glass flows into the recess 50 due to the pressure of the direct fire, and is cooled and solidified at the position of the opening end of the inner peripheral surface of the recess 50, whereby the first protrusion 52 is formed.
Immediately after the molten glass flows into the recess 50, as shown in FIG. 9, a pressure plate 63 is pressed against the opening end of the exterior portion 5 to apply pressure. At this time, since the opening end surface and the inner peripheral surface of the exterior portion 5 are softened by the heat treatment, the position behind the first protrusion 52 rises and bulges due to the pressurizing action, and the second Projecting portion 62 is formed. Note that the pressure plate 63 may be moved downward and pressed as shown, or may be moved upward and pressed.
[0031]
The inner plug portion 4 is inserted into the concave portion 50 of the exterior portion 5 formed through the above steps, and the first protruding portion 52 is engaged into the concave groove 42 and the second protruding portion 62 is inserted at the time of the insertion. The bottle plug 3 is completed by tightly fitting the outer plug portion 4 so as to bite into the outer peripheral surface of the inner plug portion 4 and integrally connecting the inner plug portion 4 and the exterior portion 5.
In this way, when the inner plug portion 4 is fitted into the recess 50 of the exterior portion 5, the first protrusion 52 formed on the inner peripheral surface of the recess 50 and the outer peripheral surface of the inner plug portion 4 are provided. Since the concave groove 42 is engaged and the second projecting portion 62 is tightly fitted to the outer peripheral surface of the inner plug portion 4, the inner plug portion 4 is prevented from coming out of the concave portion 50 of the exterior portion 5.
[0032]
The embodiment shown in FIG. 10 and FIG. 11 is provided at the position of the opening end of the inner peripheral surface of the recess 50 of the exterior portion 5 and the projection 52 of the embodiment shown in FIG. 3 and the first embodiment shown in FIG. A protrusion 52 having the same configuration as that of the first protrusion 52 is integrally formed, and four depressions 64 are formed at 90 ° equiangular positions deeper than the protrusion 52. On the other hand, on the outer peripheral surface of the inner plug portion 4, a concave groove 42 that engages with the protruding portion 52 is formed, and four protrusions 65 that engage with the respective recessed portions 64 are integrally formed.
In addition, the other structure of this Example is the same as that of the Example shown in FIG. 3, and description is abbreviate | omitted here by attaching | subjecting the same code | symbol to a corresponding structure.
[0033]
In order to manufacture the bottle cap 3 having the configuration shown in FIG. 10, the inner stopper portion 4 having the inner screw 40 on the inner peripheral surface, the concave groove 42 on the outer peripheral surface, the plurality of engaging grooves 43, and the four protrusions 65. Is molded from a synthetic resin material. On the other hand, the exterior portion 5 having a plurality of engaging protrusions 51 and four recessed portions 64 on the inner peripheral surface of the recess 50 and the above-described tapered raised portion 53 on the opening end surface is molded from a glass material. The raised portion 53 is formed around the inner peripheral edge of the opening end surface of the exterior portion 5.
[0034]
FIG. 12 shows a specific method for forming the four recessed portions 64 on the inner peripheral surface of the exterior portion 5.
In the figure, 69 is a molding die for molding the outer shape of the exterior part 5, and 70 is a plunger for molding the recess 50 of the exterior part 5. An introduction path 71 for introducing air, water, oil or the like (hereinafter referred to as “air or the like”) is formed inside the plunger 70. The introduction path 71 has a branch passage 72 that extends in all directions and opens on the outer peripheral surface of the plunger 70. Each branch passage 72 is provided with a pin 73 and a tension spring 74 that supports each pin 73. Each pin 73 is normally retracted into the branch passage 72, but when air or the like is fed into the introduction passage 71, the tip portion of each pin 73 protrudes from the outer peripheral surface of the plunger 70, and the molded body of the exterior portion 5. The indented portion 64 is formed by being pressed against the inner peripheral surface. When the feeding of air or the like is stopped, each pin 73 is retracted into each branch passage 72 by the spring force of the tension spring 74.
[0035]
Each branch passage 72 has a guide portion 76 formed by expanding the passage width. The hook portion 77 of the pin 73 is engaged with the guide portion 76 so as to be able to reciprocate. The guide portion 76 defines the stroke of the reciprocating motion of the pin 73.
In the above-described embodiment, each pin 73 is operated by applying a pressure such as air. However, the present invention is not limited to this and may be mechanically operated.
Moreover, the hollow part 64 can also be formed by methods other than the method of reciprocating the pin 73 described above. Further, the number of the recessed portions 64 is not necessarily four as in this embodiment, and may be three or less, or five or more.
[0036]
When the process of molding the exterior part 5 is completed, next, a direct fire by a burner is applied to the raised part 53 of the exterior part 5 from the outside while the exterior part 5 is axially rotated, at 1100 to 1200 degrees. By heating, the raised portion 53 is melted over the entire circumference. The molten glass flows into the concave portion 50 by the pressure of the direct fire, and is cooled and solidified at the position of the opening end of the inner peripheral surface of the concave portion 50, whereby the protruding portion 52 is formed.
[0037]
The inner plug portion 4 is inserted into the concave portion 50 of the exterior portion 5 formed through the above steps, and the protruding portion 52 is engaged into the concave groove 42 at the time of the insertion, and the protruding portion 65 is inserted into each concave portion 64. The inner stopper part 4 and the exterior part 5 are integrally coupled to complete the bottle stopper 3.
[0038]
In the embodiment shown in FIG. 13, a hook-shaped portion 44 is integrally formed on the outer peripheral surface of the opening end of the inner plug portion 4, and the opening end surface of the exterior portion 5 is covered with the hook-shaped portion 44.
According to this embodiment, when the bottle mouth part 20 of the bottle body 2 is short, when the bottle stopper 3 is attached to the bottle mouth part 20, the hook-like part 44 of the inner stopper part 4 made of synthetic resin is formed. Since the bottle body 20 is contacted, contact between the glasses is prevented. In this embodiment, in order to strengthen the anti-rotation function, a plurality of hemispherical protrusions 55 are provided on the opening end surface of the exterior portion 5, while each of the upper surfaces of the hook-like portions 44 of the inner plug portion 4 is provided. A hole 45 into which the protrusion 55 is fitted is formed.
[0039]
Each of the above embodiments has a configuration in which the bottle stopper 3 is screwed into the bottle mouth portion 20 of the bottle main body 2. However, instead of this screwing structure, other stopper structures as shown in FIGS. Can also be adopted.
[0040]
The stopper structure in the illustrated example is configured by a gutter plate portion 25 formed at the tip of the bottle mouth portion 20 and a pair of locking pieces 45 a and 45 b formed on the inner peripheral surface of the inner stopper portion 4 of the bottle stopper 3. Is done. The gutter plate portion 25 of the bottle mouth portion 20 protrudes from the outer shape of the bottle mouth portion 20 in the outer peripheral direction, and notches 26a and 26b extending in a predetermined angular range are opened at diagonal positions thereof.
The locking pieces 45a and 45b of the inner plug portion 4 are provided at diagonal positions on the inner peripheral surface of the opening end, and are formed in a slightly smaller angle range than the notches 26a and 26b.
[0041]
In order to close the bottle opening 20 with the bottle stopper 3 in this embodiment, the locking pieces 45a, 45b of the bottle stopper 3 are positioned corresponding to the notches 26a, 26b of the bottle opening 20, and then the bottle stopper 3 is Press against the bottle opening 20. As a result, the locking pieces 45a and 45b pass through the notches 26a and 26b and enter the lower portion of the cover plate portion 25. In this state, the bottle stopper 3 is rotated in either direction, whereby the locking pieces 45a and 45b. Is engaged with the lower surface of the gutter plate portion 25, and the bottle cap 3 is fixed to the bottle mouth portion 20.
[0042]
【The invention's effect】
Binsen be more prepared to this invention, the inner peripheral surface of the concave portion of the exterior portion, with the projecting portion constituting the retainer is formed integrally with the position of the opening end, on the outer peripheral surface of the inner plug part, Since the concave groove that engages with the protruding portion is provided around the inner plug portion, it is possible to prevent the inner plug portion from slipping out of the concave portion of the exterior portion, and the coupling strength between the inner plug portion and the exterior portion can be increased. According to the bottle stopper manufacturing method, a raised portion is formed in advance on the opening end surface of the exterior portion, and this protruding portion is heated and melted to form a protruding portion at the position of the opening end of the inner peripheral surface of the recess. The protrusion can be easily formed on the inner peripheral surface of the made exterior part.
[0043]
The bottle cap manufactured from the invention of claim 2 forms a second protrusion in addition to the above-described protrusion on the inner peripheral surface of the exterior part, and the bottle stopper manufactured from the invention of claim 3 Since the recess is formed on the inner peripheral surface of the exterior portion, and the protrusion that engages with the recess portion is formed on the outer peripheral surface of the inner plug portion, the coupling strength between the inner plug portion and the outer portion is further increased, and the inner plug portion is It is possible to more reliably prevent the outer portion from coming out of the concave portion. In the invention of claim 2, the second projecting portion is integrally formed on the inner peripheral surface of the concave portion by pressurizing the opening end of the outer portion. The second protrusion can be easily formed on the inner peripheral surface of the glass exterior portion, and in the invention of claim 3, the recess portion is formed in the exterior portion molding step of molding the exterior portion. There exists an effect that a hollow part can be easily formed in the internal peripheral surface of an exterior part.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an appearance of a glass bottle in which the present invention is implemented.
FIG. 2 is a front view in which a part of the glass bottle of FIG. 1 is broken.
FIG. 3 is a cross-sectional view showing the structure of a bottle cap.
4 is a cross-sectional view taken along line AA in FIG.
FIG. 5 is a bottom view of the bottle cap as viewed from below.
FIG. 6 is a cross-sectional view of an exterior part having a pre-formed raised portion.
FIG. 7 is a cross-sectional view of an exterior portion showing another embodiment of the raised portion.
FIG. 8 is a cross-sectional view showing another embodiment of a bottle cap.
FIG. 9 is a cross-sectional view showing a method of forming a protrusion on the exterior part.
FIG. 10 is a sectional view showing another embodiment of a bottle cap.
11 is a cross-sectional view taken along line BB in FIG.
FIG. 12 is a cross-sectional view showing a specific example of a method for forming a recess.
FIG. 13 is a sectional view showing another embodiment of a bottle cap.
FIG. 14 is a cross-sectional view showing another structure for stopping the bottle cap.
15 is a perspective view showing the stopper structure of FIG . 14. FIG.
FIG. 16 is a cross-sectional view showing a configuration of a conventional bottle cap.
FIG. 17 is a cross-sectional view showing the configuration of another conventional bottle cap.
FIG. 18 is a cross-sectional view showing the configuration of another conventional bottle cap.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bottle 2 Bottle main body 20 Bottle mouth part 3 Bottle stopper 4 Inner stopper part 42 Concave groove 5 Exterior part 50 Concave part 52 Protrusion part 62 Second protrusion part 64 Depression part 65 Protrusion part

Claims

A method for producing a bottle stopper in which an inner stopper part made of a synthetic resin covering a bottle mouth part of a bottle is inserted into a recess formed in a glass outer part and the inner stopper part and the outer part are integrally coupled,
Inner plug part molding step of molding an inner plug part made of synthetic resin having a concave groove formed on the outer peripheral surface;
An exterior part molding step for molding a glass exterior part having a recessed part having a shape that conforms to the outer shape of the inner plug part, and having a raised part on the opening end surface of the recessed part,
A retaining formation step of integrally forming a protruding portion at the position of the opening end of the inner peripheral surface of the concave portion by heating and melting the raised portion of the exterior portion into the concave portion,
The inner plug portion is inserted into the recess of the exterior portion, and when the insertion is performed, the projecting portion is engaged in the recessed groove, and a coupling step for integrally coupling the inner plug portion and the exterior portion is performed. Binsen recipe, characterized in that to produce the plug.

A method for producing a bottle stopper in which an inner stopper part made of a synthetic resin covering a bottle mouth part of a bottle is inserted into a recess formed in a glass outer part and the inner stopper part and the outer part are integrally coupled,
Inner plug part molding step for molding an inner plug part made of synthetic resin having a concave groove formed on the outer peripheral surface;
An exterior part molding step for molding a glass exterior part having a recessed part having a shape that conforms to the outer shape of the inner plug part, and having a raised part on the opening end surface of the recessed part,
A first retaining forming step of integrally forming the first protrusion at the position of the opening end of the inner peripheral surface of the recess by heating and melting the raised portion of the exterior portion into the recess;
A second retaining forming step of integrally forming a second protrusion at a position deeper than the first protrusion on the inner peripheral surface of the recess by pressurizing the opening end of the exterior part;
The inner plug portion is inserted into the recess of the exterior portion, and when the plug is inserted, the first protruding portion is inserted into the recessed groove, and the second protrusion is closely fitted to the outer peripheral surface of the inner plug portion. Then, a bottle stopper is manufactured by performing a joining step for integrally connecting the inner stopper part and the exterior part .

A method for producing a bottle stopper in which an inner stopper part made of a synthetic resin covering a bottle mouth part of a bottle is inserted into a recess formed in a glass outer part and the inner stopper part and the outer part are integrally coupled,
Inner plug part molding step of molding a synthetic resin inner plug part in which a concave groove is provided on the outer peripheral surface and the protruding part is integrally formed;
An exterior part molding step for molding a glass exterior part having a concave part conforming to the outer shape of the inner plug part, and having a raised part on the opening end face of the concave part and a hollow part on the inner peripheral surface of the concave part When,
A retention forming step of integrally forming a protruding portion at the position of the opening end of the inner peripheral surface of the concave portion by heating and melting the raised portion of the exterior portion into the concave portion,
The inner plug portion is inserted into a recess in the exterior portion, and when the insertion is performed, the protruding portion is engaged in the recessed groove, and the protrusion is engaged in the recessed portion, so that the inner plug portion and the exterior portion are connected. Binsen recipe, characterized in that to produce a bottle stopper to implement a coupling step of integrally connected.