JP3875421B2

JP3875421B2 - Can with temporary sealing stopper

Info

Publication number: JP3875421B2
Application number: JP37385898A
Authority: JP
Inventors: 義彦松川; 山本　　明; 利夫山本; 和義江成
Original assignee: Daiwa Can Co Ltd
Current assignee: Daiwa Can Co Ltd
Priority date: 1998-12-28
Filing date: 1998-12-28
Publication date: 2007-01-31
Anticipated expiration: 2018-12-28
Also published as: JP2000191020A

Description

【０００１】
【発明の属する技術分野】
この発明は、容易に開蓋することができるとともに、缶体に封入された飲料等の内容物が飲みやすい形状又は注ぎ出しやすい形状を有し、かつ開蓋後に開口部を仮封止することができる開口仮封止栓付缶に関するものである。
【０００２】
【従来の技術】
イージーオープン缶として、弱化線によって缶蓋に区画形成された開口片を押圧し、その開口片を弱化線に沿って破断させるタイプの缶が知られている。これらの缶として、例えば特開平８−１６９４５４号公報に記載されたものと米国特許第４９７６３６８号明細書に記載されたものとがある。
【０００３】
特開平８−１６９４５４号公報に記載された発明は、蓋部材において環状移行部からスカートまたはエプロンが容器本体から離れる方向であってその中心軸に近づく方向に向かって伸び、その先端に頭部を介してトップが形成されている。そして、そのトップには下部側に弱化線によって囲まれた凹形押し下げタブが形成されている。そして、缶蓋を開ける場合には、その凹形押し下げタブを指で押圧することにより弱化線を破断しつつ凹形押し下げタブを容器本体内部に押し下げて開口させ、その開口片を缶蓋の内部に吊り下げ状態にする。
【０００４】
また、米国特許第４９７６３６８号明細書に記載された発明は、缶蓋上方へ突出した外周壁とその外周壁から内方へ平坦な環状パネルが延出し、さらに環状パネルから下方に内周壁が垂下し、その内周壁の下端が三重になっており、その最下部に形成された弱化線により開口片が区画されて形成されている。そして、この開口片には凸タブが形成されており、缶蓋を開ける場合には、その凸タブを指で押し下げて開口片を弱化線の部分で破断し、開口片を缶蓋の内周側に吊り下げ状態にして缶蓋を開ける。
【０００５】
【発明が解決しようとする課題】
上述の二つのいずれの発明においても、指によって開口片を押し下げ、弱化線部分を破断しつつ開口片を缶体内へ押し下げて缶蓋を開けるので、缶体に封入された飲料等が指に付着する可能性がある。特に、炭酸含有飲料では、開蓋時に飲料が噴き出ることがあるので、飲料が指に付着する可能性が高い。また、開蓋の際に開口片の縁部によって指を傷つける可能性があるとともに、消費者の指の大きさや長さ、押圧力の大小等の個人差によって、指で缶蓋を開けることが容易ではない場合が生じる可能性がある。
【０００６】
なお、小さい押圧力でも缶蓋を開けることができるように、弱化線となるスコア線を全周にわたって深く刻むことや、ヒンジ部となる部分を除いて開口部の周りを一旦切断した後に、切断部分をプラスチゾル等の密封剤で接合するタイプの弱化線の場合には、密封剤の接着力を弱くしておくことも考えられる。しかし、そのような構成では、缶体の輸送中に受ける衝撃により、弱化線が破断する可能性があり、また、缶内圧力が高くなった場合に、弱化線が破断して封入された飲料が噴き出る可能性がある。結局、このような事態を考慮すると、弱化線を広範囲にわたってその強度を低下させることは困難である。さらに、缶蓋を開けた際に、開口片は缶体内部に押し下げられるので、その開口片によって開口部を再度閉じることができない。
【０００７】
更にまた、米国特許第４９７６３６８号明細書に記載された発明は、缶蓋の開口のし易さに配慮した発明であって、フランジ部よりも上方に突出する突出部を缶蓋に形成してあるが、この缶蓋を巻き締めた缶を複数積み重ねる場合の課題については何ら考慮していないので、その突出部と缶底との干渉によって複数の缶を安定して積み重ねることができない不都合があり、そのために輸送コストや保管コストが増大する可能性がある。
【０００８】
一方、特開平８−１６９４５４号公報に記載された発明では、複数の缶を積み重ねる手段として缶の底部を特殊な形状にすることが提案されているが、フランジ部よりも上方に突出する突出部を具備する缶蓋を巻き締めることに伴って、缶底も特殊な形状のものを使用するとすれば、既存の設備を、特別な底部金型を使用する設備に変更する必要が生じ、底部金型の製造コストや底部金型取り替え時間のロスに起因するコストなどによって缶の全体としての製造コストが高騰するなどの問題がある。
【０００９】
この発明は上記の事情を背景としてなされたものであり、容易に缶蓋を開けることができるとともに、開けられた缶蓋を仮封止することができ、さらに、缶を複数積み重ねることのできる開口仮封止栓付缶を提供することを目的とするものである。
【００１０】
【課題を解決するための手段およびその作用】
上記の目的を達成するために、請求項１の発明は、外周縁部に形成されたフランジ部を缶胴の開口部に巻き締め固着することにより缶蓋が缶胴に一体化され、その缶蓋の中央部に前記フランジ部より軸線方向に突出した突出部が形成されるとともに、該突出部の内周側に、該突出部の外周縁よりも窪んだ窪み部が形成され、該窪み部に、押し下げ力により破断しかつ連結していない両端を有する弱化線で区画されたほぼ円形の開口片が設けられ、該開口片の外側の蓋板部分が少なくとも該弱化線部分を覆うように折り畳まれ、さらに前記缶蓋の突出部に開口仮封止栓が冠着された開口仮封止栓付缶において、前記突出部の先端外周部に少なくとも部分的に、前記開口仮封止栓が係合する溝部を具備する係合突起部が形成され、その開口仮封止栓が、前記突出部に外嵌される第一円筒部を備えるともに前記係合突起部に係合する第一仮止め突起部がその第一円筒部の内周面に突出して形成されており、前記第一円筒部とは軸線方向で反対側に延びる第二円筒部が該第一円筒部と一体に形成されるとともに、該第二円筒部の内周側に、該第二円筒部よりも軸線方向外方に突出して前記開口片を押圧する開口嵌合凸部が形成されており、前記第一円筒部と前記第二円筒部との連結部分から半径方向外方へ延びる環状板部が形成されており、該環状板部の直径が、前記缶胴の下端に突出して形成された接地部の直径よりも大きくされ、かつ第一外壁部を前記第一円筒部とほぼ平行に該環状板部の外縁部から垂下させるとともに、該第一外壁部と反対側で、前記第二円筒部の外側に第二外壁部を立ち上げ、該第一外壁部の下端に前記缶胴と前記缶蓋との巻締部に係合する第二仮止め突起部が形成されており、前記第一円筒部が前記突出部に外嵌され、前記第一外壁部が前記缶蓋と前記缶胴との巻締部に係合された状態で前記開口仮封止栓を前記缶蓋に冠着して複数の缶を積み重ねた際に、該開口仮封止栓の上方に上積みされた缶の接地部が前記開口仮封止栓の環状板部に当接し、前記第二外壁部が該上積みされた缶の接地部近傍の壁面に当接するように構成されていることを特徴とするものである。
【００１１】
従って、請求項１の発明によれば、第一仮止め突起部が開口仮封止栓の第一円筒部に形成されていることによって、開口仮封止栓を缶蓋の係合突起部に係合させた状態で缶体を輸送・販売することができる。また、缶蓋を開けて、缶体内の飲料を缶体から直接飲用する際に、開口部から流下する内容液が触れる缶蓋の窪み部と係合突起部とその間の部分及び下唇が触れる係合突起部より下方部分が開口仮封止栓で覆われているので、輸送・販売中に異物がこれら缶蓋の係合突起部等に付着することを防ぐことができ、衛生的である。
【００１２】
また、突出部の窪み部に形成された弱化線を破断し開蓋するために開口仮封止栓の開口嵌合凸部が用いられることによって、指で弱化線を破断し開蓋する場合と比較して指を傷つけたり、指に飲料等の内容液が付着する虞がない。また、無理無く開口片を押圧して弱化線を破断し開蓋することができる。
【００１３】
さらに、開蓋後、開口仮封止栓によって、缶蓋の開口部を仮封止することができるので、缶体を倒した場合のように飲み残した飲料又は使い残した内容液をこぼしてしまうことを防ぐことができ、また仮封止した缶体を持ち運ぶことができる。
【００１４】
更に又、缶の底部を特殊な金型によって成形しなくとも、開口仮封止栓が冠着した缶を複数積み重ねて店頭で陳列することが可能である。しかも、開口仮封止栓は合成樹脂により一体成形可能であるので、缶の底部を特殊な金型によって成形する場合と比較して製造コストを削減させることができる。
【００１５】
また、請求項２の発明は、請求項１の発明に加えて、前記環状板部の外縁部に、前記第一外壁部とは軸線方向反対側へ前記第二円筒部と平行に延びる第二外壁部が立ち上げられて形成され、前記第一円筒部が前記突出部に外嵌され、前記第一外壁部が前記缶蓋と前記缶胴との巻締部に係合された状態で前記開口仮封止栓を前記缶蓋に冠着して複数の缶を積み重ねた際に、該開口仮封止栓の上方に上積みされた缶の接地部が前記開口仮封止栓の環状板部に当接し、前記第二外壁部の上端が該上積みされた缶の接地部の外側の壁面に当接するように構成されていることを特徴とするものである。
【００１６】
従って、請求項２の発明によれば、複数の缶を積み重ねたときに、前記環状板部に上積みされた缶の接地部が当接し、前記第二外壁部の上端が上積みされた缶の接地部の外側の壁面部分に当接するので、開口仮封止栓付缶の上に別の開口仮封止栓付缶を安定的に積み重ねることができる。その結果、販売時に店頭に陳列し易いと共に、店頭陳列中の缶の落下を防ぐことができる。
【００１７】
さらに、請求項３の発明は、請求項１の発明に加えて、前記第一円筒部が前記突出部に外嵌され、前記第一外壁部が前記缶蓋と前記缶胴との巻締部に係合された状態で前記開口仮封止栓を前記缶蓋に冠着して複数の缶を積み重ねた際に、該開口仮封止栓の上方に上積みされた缶の接地部が前記開口仮封止栓の環状板部に当接し、前記第二外壁部の上端が該上積みされた缶の接地部の内側の壁面に当接するように構成されていることを特徴とするものである。
【００１８】
従って、請求項３の発明によれば、環状板部から立ち上げられている第二外壁部が缶の接地部の内側の壁面と接触するので、第二外壁部を完全な円筒状にした場合でも、その直径を小さくすることができる。その結果、開口仮封止栓を合成樹脂で成形する際に樹脂使用量を少なくでき、製造コストを削減することができる。
【００１９】
【発明の実施の形態】
つぎにこの発明の実施例を図面を参照して説明する。図１はこの発明の一実施例を示すものであって、ここには開口部突出缶蓋１と開口仮封止栓３１とが示されている。まず、開口部突出缶蓋１について説明する。この開口部突出缶蓋１は、アルミニウム合金などの金属製の平板材（図示せず）から形成されている。なお、この平板材の一方の表面には、予め合成樹脂からなる内面被膜（図示せず）が形成されている。この内面被膜は保護塗料や樹脂フィルムから形成されている。その塗料としては、熱硬化性及び熱可塑性樹脂からなる任意の保護塗料、例えばフェノール−エポキシ塗料、アミノ−エポキシ塗料等の変性エポキシ塗料、塩化ビニル−酢酸ビニル共重合体、エポキシフェノール変性−ビニル塗料等のビニルまたは変性ビニル塗料等の単独または２種以上の組み合わせが使用される。また、その樹脂フィルムとしては、例えばポリエチレンテレフタレート（ＰＥＴ）を基本構成とし、さらにポリエチレンイソフタレート（ＰＥＩＴ）等のコポリマーでも適用できる。また、樹脂フィルムが内面被膜に用いられる場合、その樹脂フィルムは、未延伸のものでも二軸延伸のものでもよい。
【００２０】
そして、開口部突出缶蓋１の外周側には、円筒状の缶胴２１の開口部に巻締固着して巻締部２を形成する周知形状のフランジ部（図示せず）が形成されている。また、その巻締部２から開口部突出缶蓋１の半径方向内側には、図１においてほぼ下方向に窪むＵ字形である外周溝３が形成されている。
【００２１】
そして、外周溝３から缶胴２１の中心軸側に向かうとともに図１における上方向に延出してスカート壁４が形成されている。このスカート壁４は、その断面が缶胴２１の軸線方向に突出するように弧を描くように延出している。またこのスカート壁４の図１における上端部に続けて隆起部５が形成されている。さらに、その隆起部５の図１における上端部には、半径方向外方へ環状に突出している係合突起部６が形成されている。
【００２２】
この係合突起部６は、スカート壁４から隆起部５を経て軸線方向に突出する環状突出部分の頂部からわずか下がった部分の外径を、頂部の外径より小さくすることによる形成された半径方向に突出した部分である。
【００２３】
また、隆起部５の頂部は、半径方向に沿う所定幅の環状の平坦面とされており、ここに接触面７が形成されている。さらに、その接触面７よりも内周側には窪み部８が形成されている。窪み部８の底部に開口片９が形成されている。この開口片９は、その周囲がスコア線から成る弱化線１０によって一部を残して略円形に区画されている。そして、図２に示すように、この弱化線１０を挟んでその両側の窪み部８の底部が、三重になるように折り曲げられ（又は折り畳まれ）ており、弱化線１０はこの折り曲げられた窪み部８の図２における最も下側に位置する箇所に形成されている。従って、弱化線１０を破断した場合、開口部側の切断端面は折り畳み部の内方端よりも外側に位置するので、消費者がこの切断端で指等を負傷することはない。また、弱化線１０は、三重に折り曲げられた窪み部８の底部の部分の内周側先端部すなわち最小内径Ｄ1 の部分よりも外周側に形成されている。なお、開蓋性を良くするために、弱化線１０の一部を完全に切断しておいても良い。
【００２４】
さらに、弱化線１０を挟んで窪み部８の底部と開口片９とに亘って図２における下側からプラスチゾル１１が塗布されている。このプラスチゾル１１は缶体の内圧の変化によって弱化線１０が破断することを防ぐとともに、弱化線１０を形成することによる塗膜の損傷を補修し、飲料などの内容物の侵入による開口部突出缶蓋１の腐食を防ぐためのものである。このプラスチゾル１１を塗布することで、弱化線１０の一部が完全に切断されていても、内容液の漏洩を防止できる。
【００２５】
また、開口片９には、図での上方に隆起する凸部１２が形成されている。この凸部１２は、缶蓋を開ける際に開口仮封止栓３１が開口片９を容易に押圧することができるために形成されている。
【００２６】
つぎに、開口仮封止栓３１について説明する。開口仮封止栓３１は、ポリエチレン樹脂やポリプロピレン樹脂等の合成樹脂で成形され、図１に示すように、その外周側には図１の下方向に延びる第一外壁部３２が形成されている。この第一外壁部３２は巻締部２とほぼ同一径の円筒状の部分であって、その下端内面には、開口部突出缶蓋１の巻締部２に嵌合する嵌合凹部３３が、開口仮封止栓３１の周方向に亘って形成されている。この嵌合凹部３３の下方には、巻締部２の図１における下側に嵌入する第二仮止め突起部３４が形成されている。従って嵌合凹部３３は、第一外壁部３２の下端内周面に溝状に形成されている。
【００２７】
また、開口仮封止栓３１の外周部には、上記の第一外壁部３２とは反対方向（図１の上方向）に向けて突出した第二外壁部３５が一体に形成されている。この第二外壁部３５は、後述するように、開口部突出缶蓋１が固着された缶胴２１を輸送・陳列等のために積み重ねる際に、積み重ねられた上側の缶の底部に当接する形状に形成されている。さらに、その第二外壁部３５と第一外壁部３２との間から開口仮封止栓３１の半径方向に環状平板部３６が延出している。言い換えれば、各外壁部３２，３５は、環状平板部３６の外周部に、軸線方向に突出した状態に形成されている。
【００２８】
この環状平板部３６の中央部には、図１の下方向に延出する第一円筒部３７が形成されている。この第一円筒部３７は前述した係合突起部６の外径とほぼ等しい内径の円筒状部分であって、その下端内面には、半径方向で内側に突出する第一仮止め突起部３８が等間隔に複数個（図示の例では４個）形成されている。これらの第一仮止め突起部３８が開口部突出缶蓋１の係合突起部６の上端の環状突出部を弾性変形して乗り越え、その下側の環状凹部に嵌入することによって、開口仮封止栓３１が開口部突出缶蓋１に着脱可能に冠着されるようになっている。
【００２９】
また、環状平板部３６の中央部には、第一円筒部３７とは反対方向（図１の上方向）に向けて突出しかつ第一円筒部３７と同一径の第二円筒部３９が形成されている。この第二円筒部３９の内周側に、開口嵌合凸部４５が形成されている。この開口嵌合凸部４５は、前述した開口片９を押し開くとともに開口片９を押し開いた結果生じる開口部４２に嵌合する凸部であり、前記環状平板部３６側の基端部の外径が開口部４２の内径より大きく、かつ先端部の外径が開口部４２の内径より小さいテーパ部４０を有している。このテーパ部４０のうち、開口部４２の内径よりわずか小さい部分に、半径方向で外側に突出した仮封止突起部４１が円周方向に等間隔に複数個（図示の例では４個）形成されている。
【００３０】
前記テーパ部４０の先端部には、テーパ角がさらに大きい傾斜部４３が連続して形成され、その傾斜部４３の先端部が、半径方向に沿う平坦な押圧面４４とされている。
【００３１】
つぎに、この発明に係る上記の開口部突出缶蓋１及び開口仮封止栓３１の作用について説明する。図１は、未開蓋の状態を示しており、搬送や陳列などの場合に開口仮封止栓３１が図１に示すように開口部突出缶蓋１に取り付けられる。すなわち、開口嵌合凸部４５を外向きにして開口仮封止栓３１が開口部突出缶蓋１に冠着される。この状態では、第一外壁部３２が巻締部２に外嵌し、巻締部２が嵌合凹部３３に入り込み、その嵌合凹部３３を形成している第二仮止め突起部３４が巻締部２に係止されている。
【００３２】
また同時に、第一円筒部３７が隆起部５の先端側に形成されている係合突起部６に外嵌し、その先端部の第一仮止め突起部３８が係合突起部６に係合している。このように、嵌合凹部３３が巻締部２に係合し、かつ第一仮止め突起部３８が係合突起部６に係合することにより、開口仮封止栓３１が開口部突出缶蓋１に所定の強度で冠着される。
【００３３】
図３は、底付缶胴であるツーピース缶胴２１に開口部突出缶蓋１を巻締固着したものに、開口仮封止栓３１を嵌着して、搬送あるいは陳列のために積み重ねた状態を示しており、開口仮封止栓３１の上に載せられているツーピース缶の缶底２２は、通常のドーミング加工が施された形状であって、下面側に突出している環状の接地部２３と、この外周部に連続して缶胴２１に到る底壁部２４と、接地部２３の内周側のドーム部２５とから構成されている。積み重ねられた上側の缶の接地部２３が環状平板部３６に接触し、従って開口仮封止栓３１の上に缶が載った状態となる。その場合、ドーミング加工の深さ、言い換えれば、ドーム部２５の中心部から接地部２３の頂部までの軸線方向での寸法が、環状平板部３６からの開口嵌合凸部４５の高さより大きいので、開口嵌合凸部４５は、ドーム部２５に接触せずにその内側に収容された状態となる。
【００３４】
一方、第二外壁部３５が底壁部２４の壁面に接触し、その先端で缶底２２を支えている状態となる。従って上側の缶は、横方向へのズレや傾きを生じることなく、安定的に開口仮封止栓３１の上に載った状態で積み重ねられる。
【００３５】
また、開口仮封止栓３１は、開口部突出缶蓋１と缶胴２１との巻締部２に係合しているので、開口仮封止栓３１を介して作用する荷重が、下側の缶の缶胴２１に主に作用することになり、そのため、支持強度が高くなり、多数段に缶を積み重ねることができる。さらに、缶底２２の形状は、従来のドーミング加工による形状でよく、従って既存の設備に対して缶底２２を成形するための特別な底部金型を用意する必要がなく、また底部金型を取り換える必要がないので、製造コストの上昇を抑制もしくは回避することができる。
【００３６】
また、図１に示すように、第一外壁部３２が開口部突出缶蓋１の巻締部２に係合していることによって、開口部突出缶蓋１の全体が外部に露出することが防止される。その結果、搬送中や陳列中に開口部突出缶蓋１に埃や汚れが付着することを防ぐことができ、衛生的である。なお、店頭陳列時中に開口仮封止栓３１に埃が付着したり、いたずらされないように、開口仮封止栓３１を透明または不透明な熱収縮性のプラスチックフィルム等によってシュリンク包装しても良い。
【００３７】
つぎに開蓋及び仮封止の作用について説明する。先ず、シュリンク包装されている場合には、その包装を取り除き、さらに開口仮封止栓３１を開口部突出缶蓋１から取り外す。これは、開口仮封止栓３１が弾性のある合成樹脂によって形成されているので、第一外壁部３２を外側に広げつつ開口部突出缶蓋１の上方向に引くことにより、係合凹部３３が巻締部２から外れるので、容易に行うことができる。
【００３８】
つぎに、開口仮封止栓３１をその押圧面４４が開口部突出缶蓋１の開口片９に対向するように保持し、その後、開口仮封止栓３１の押圧面４４を開口部突出缶蓋１の開口片９に当接させ、押圧する。その際、開口片９に凸部１２が形成されているので、容易に押圧面４４を開口片９に当接させ、押圧することができる。
【００３９】
開口片９が押圧されることによって、弱化線１０で破断が生じ、プラスチゾル１１が引きちぎられて、開口片９が缶体内部に押し下げられる。弱化線１０を完全に切断した部分を設けておくと、そこを起点として破断が進行するので、比較的小さな押圧力で開蓋できる。なお、弱化線１０の両端が連結してはいないので、その弱化線１０が形成されていない箇所がヒンジとなって開口片９が回転し、押し下げられて吊り下げられた状態になる（図４参照）。その結果、三重に折り曲げられた部分の内周側先端部分に囲まれた開口部４２が生じる。
【００４０】
開口片９が押し下げられて開口部４２が形成されることにより、消費者は開口部４２に嵌入した開口仮封止栓３１を開口部突出缶蓋１から引き離し、その後缶体を傾けて開口部４２から窪み部８、接触面７を伝わって流下して来た飲料を飲むことができる。その際、消費者は、缶胴２１と開口部突出缶蓋１の巻締部２よりもかなり小径のスカート壁４と隆起部５及び係合突起部６とに下唇を当てて飲用するが、係合突起部の外径を、大人の口よりも十分小さくしてある（３５ｍｍ以下）ので、巻締部２よりも下方に開口部が形成される通常のイージーオープン缶蓋を巻き締めた缶から直接飲用する場合のように、消費者の鼻が巻締部２や蓋板面にぶつかることがなく、また、飲料をこぼすことなく飲むことができる。また、内容液をコップ等に注ぎ出すのも容易である。なお、缶蓋を開ける際に、消費者の指が開口片９に直接触れることがないので、飲料等の内容液が指に付着することも防ぐことができる。
【００４１】
また、消費者は開口仮封止栓３１を用いて、開口部突出缶蓋１の開口部４２を仮封止することができる。この場合には、開口仮封止栓３１の押圧面４４を開口部突出缶蓋１の開口部４２に向けて保持し、開口仮封止栓３１を開口部４２に嵌入させる。すると、開口仮封止栓３１のテーパ部４０に形成された仮封止突起部４１が、開口部突出缶蓋１の開口部４２の縁部に係合する（図５参照）。その結果、開口部突出缶蓋１が開口仮封止栓３１によって仮封止される。テーパ部４０に仮封止突起部４１が形成されていることによって、開口部４２に開口仮封止栓３１を嵌入させて、開口された開口部突出缶蓋１を容易に仮封止させることができる。
【００４２】
つぎに、この発明の他の例について図面を参照して説明する。なお、上記の実施例と同じ構成を有する部材については、同じ参照番号を付し、その説明を省略する。図６に示すように、開口仮封止栓５１は、第二外壁部５２が第一外壁部３２と第一円筒部３７との間の図６における上側に形成されている点以外は、開口仮封止栓３１と同様の構成を有している。そして、この開口仮封止栓５１を開口部突出缶蓋１に冠着させた状態で、缶胴２１を積み重ねると、上側に積み重ねられた缶胴２１の缶底２２の内周側の底壁であるドーム部２５の壁面が、開口仮封止栓５１の第二外壁部５２に当接する。
【００４３】
その結果、缶胴２１が五段積みされて最下段に保管されても、開口仮封止栓５１が部分的に変形して、開口部突出缶蓋１から外れたり、開口部突出缶蓋１の開口片９を押し下げて開口部突出缶蓋１を開口させてしまうことはない。また、開口仮封止栓５１は、前述の例における開口仮封止栓３１と比較して、第二外壁部５２の直径が短い分、第二外壁部５２を形成するための樹脂の使用量が少なくて済み、製造コストを更に削減することができる。
【００４４】
なお、第二外壁部３５，５２の代わりに、円筒を幾箇所か切り欠いたものや同一円周上にほぼ等間隔に設けた凸部でも良い。このような凸部でも、パレット積みされた際に、開口仮封止栓３１，５１が受ける荷重を支えることができる。
【００４５】
上記実施形態では、弱化線としてスコア線を用いた例を述べたが、ヒンジ部となる部分を残して所定形状に金属板を一旦切断してから密封剤で切断部分を接合・封鎖して弱化線を形成しても良く、また、缶胴も、ツーピース缶胴に限らず、他端に缶蓋を巻締めたスリーピース缶胴でも良い。
【００４６】
【発明の効果】
以上説明したように、請求項１に記載した発明では、第一仮止め突起部が開口仮封止栓の第一円筒部に形成されていることによって、開口仮封止栓を開口部突出缶蓋の係合突起部に係合させた状態で缶体を輸送・陳列することができる。また、開口部突出缶蓋を開けて、缶体内の飲料を缶体から直接飲用する際に、開口部から流下する内容液が触れる開口部突出缶蓋の窪み部と係合突起部及びその間の部分が開口仮封止栓で覆われているので、輸送・陳列中に異物がこれら缶蓋の係合突起部等に付着することを防ぐことができ、衛生的である。
【００４７】
また、突出部の窪み部に形成された弱化線を破断し開蓋するために開口仮封止栓の開口嵌合凸部が用いられることによって、指で弱化線を破断し開蓋する場合と比較して指を傷つけたり、指に飲料等の内容液が付着する虞がない。また、無理無く開口片を押圧して弱化線を破断し開蓋することができる。
【００４８】
さらに、開蓋後、開口仮封止栓によって、開口部突出缶蓋の開口部を仮封止することができるので、缶体を倒した場合のように飲み残した飲料又は使い残した内容液をこぼしてしまうことを防ぐことができ、また仮封止した缶体を持ち運ぶことができる。
【００４９】
更に又、缶の底部を特殊な金型によって成形しなくとも、開口仮封止栓が冠着した缶を複数積み重ねることが可能である。しかも、開口仮封止栓は合成樹脂により一体成形可能であるので、缶の底部を特殊な金型によって成形する場合と比較して製造コストを削減させることができる。
【００５０】
また、請求項２の発明では、複数の缶を積み重ねたときに、前記環状板部に上積みされた缶の接地部が当接し、前記第二外壁部の上端が上積みされた缶の接地部の外側の壁面部分に当接するので、開口仮封止栓付缶の上に別の開口仮封止栓付缶を安定的に積み重ねることができる。その結果、販売時に店頭に陳列し易いと共に、陳列中の缶の落下を防ぐことができる。
【００５１】
さらに、請求項３の発明では、環状板部から立ち上がる第二外壁部が缶の接地部の内側の壁面と接触するので、第二外壁部を完全な円筒状にした場合でも、その直径を小さくすることができる。その結果、開口仮封止栓を合成樹脂で成形する際に樹脂使用量を少なくでき、製造コストを削減することができる。
【図面の簡単な説明】
【図１】この発明の実施例である開口仮封止栓付缶の開口部突出缶蓋と開口仮封止栓とを示す断面図である。
【図２】開蓋前の弱化線の近傍を示す部分断面図である。
【図３】開口仮封止栓の上側に開口仮封止栓付缶の缶底を当接させて積み重ねた状態を示す断面図である。
【図４】開蓋後の開口仮封止栓付缶の開口部突出缶蓋と開口仮封止栓とを示す断面図である。
【図５】開蓋後に開口部を開口仮封止栓により仮封止した状態の弱化線の近傍を示す部分断面図である。
【図６】この発明の他の実施例である開口仮封止栓付缶の開口部突出缶蓋と開口仮封止栓を、その開口仮封止栓の上側に開口仮封止栓付缶の缶底を当接させて積み重ねた状態を示す断面図である。
【符号の説明】
１…開口部突出缶蓋、６…係合突起部、７…接触面、８…窪み部、９…開口片、１０…弱化線、１１…プラスチゾル、１２…凸部、２１…缶胴、２２…缶底、２３…接地部、２４…底壁部、２５…ドーム部、３１，５１…開口仮封止栓、３２…第一外壁部、３３…嵌合凹部、３４…第二仮止め突起部、３５，５２…第二外壁部、３６…環状平板部、３７…第一円筒部、３８…第一仮止め突起部、３９…第二円筒部、４０…テーパ部、４１…仮封止突起部、４２…開口部、４４…押圧面、４５…開口嵌合凸部。[0001]
BACKGROUND OF THE INVENTION
This invention is capable of easily opening the lid, and having a shape such as beverages enclosed in a can that is easy to drink or pour out, and temporarily sealing the opening after opening. The present invention relates to a can with an opening temporary sealing stopper.
[0002]
[Prior art]
As an easy open can, there is known a type of can in which an opening piece defined on a can lid is pressed by a weakening line and the opening piece is broken along the weakening line. As these cans, there are, for example, those described in JP-A-8-169454 and those described in US Pat. No. 4,976,368.
[0003]
In the invention described in Japanese Patent Laid-Open No. 8-169454, the skirt or apron extends from the annular transition portion of the lid member in the direction away from the container body and approaches the central axis, and the head is attached to the tip. The top is formed through. A concave push-down tab surrounded by a weakening line is formed on the top side of the top. Then, when opening the can lid, the concave push-down tab is pushed down into the container main body by opening the concave push-down tab with a finger and the concave push-down tab is pushed down into the container body, and the opening piece is opened inside the can lid. Suspended in the state.
[0004]
Further, in the invention described in US Pat. No. 4,976,368, an outer peripheral wall projecting upward from a can lid, a flat annular panel extending inward from the outer peripheral wall, and an inner peripheral wall depending downward from the annular panel. And the lower end of the inner peripheral wall is triple, and the opening piece is defined by the weakening line formed in the lowermost part. The opening tab is formed with a convex tab. When the can lid is opened, the convex tab is pushed down with a finger to break the opening piece at the weakened line portion, and the opening piece is cut into the inner periphery of the can lid. Open the can lid by hanging it to the side.
[0005]
[Problems to be solved by the invention]
In both of the above-mentioned two inventions, the opening piece is pushed down by the finger and the opening piece is pushed down into the can body while breaking the weakened line portion to open the can lid, so that the beverage or the like enclosed in the can body adheres to the finger there's a possibility that. In particular, in a carbonated beverage, since the beverage may erupt when the lid is opened, there is a high possibility that the beverage will adhere to the finger. In addition, there is a possibility that the finger may be damaged by the edge of the opening piece when opening the lid, and the can lid may be opened with the finger depending on individual differences such as the size and length of the consumer's finger and the size of the pressing force. It may not be easy.
[0006]
In order to open the can lid even with a small pressing force, cut the score line as a weakening line deeply around the entire circumference, or cut once around the opening except for the hinge part. In the case of a weakening line of a type in which the portions are joined with a sealing agent such as plastisol, it may be possible to weaken the adhesive strength of the sealing agent. However, in such a configuration, there is a possibility that the weakening line may be broken due to an impact received during transportation of the can body, and when the internal pressure of the can becomes high, the weakening line is broken and enclosed in the beverage May spout. After all, considering such a situation, it is difficult to reduce the strength of the weakening line over a wide range. Furthermore, when the can lid is opened, the opening piece is pushed down into the can body, and therefore the opening cannot be closed again by the opening piece.
[0007]
Furthermore, the invention described in the specification of US Pat. No. 4,976,368 is an invention that takes into account the ease of opening of the can lid, and has a protruding portion protruding above the flange portion on the can lid. However, there is a problem in that it is not possible to stably stack multiple cans due to interference between the protrusions and the bottom of the can because there is no consideration for the problem of stacking multiple cans with the can lids tightened. Therefore, transportation costs and storage costs may increase.
[0008]
On the other hand, in the invention described in JP-A-8-169454, it has been proposed that the bottom of the can has a special shape as a means for stacking a plurality of cans. When the can bottom with a special shape is used, the existing equipment needs to be changed to equipment that uses a special bottom mold. There is a problem that the manufacturing cost of the can as a whole increases due to the cost of the mold and the cost due to the loss of the bottom mold replacement time.
[0009]
The present invention has been made against the background of the above circumstances, and can open the can lid easily, can temporarily seal the opened can lid, and can further open a plurality of cans can be stacked The object is to provide a can with a temporary sealing stopper.
[0010]
[Means for Solving the Problem and Action]
In order to achieve the above object, the invention of claim 1 is characterized in that a can lid is integrated into a can body by winding and fixing a flange portion formed on an outer peripheral edge to an opening of the can body, and the can A protrusion that protrudes in the axial direction from the flange is formed at the center of the lid, and a recess that is recessed from the outer peripheral edge of the protrusion is formed on the inner peripheral side of the protrusion. Are provided with a substantially circular opening piece that is delimited by a weakening line having both ends not broken and connected by a pressing force, and the cover plate part outside the opening piece is folded so as to cover at least the weakening line part. Further, in the can with a temporary opening sealing plug, wherein the protruding portion of the can lid is crowned with an opening temporary sealing plug, the opening temporary sealing plug is at least partially engaged with the outer peripheral portion of the tip of the protruding portion. Engagement projections with grooves to be mated are formed, and the temporary opening is sealed Is provided with a first cylindrical portion that is externally fitted to the protruding portion, and a first temporary fixing protruding portion that engages with the engaging protruding portion is formed to protrude from the inner peripheral surface of the first cylindrical portion, A second cylindrical portion that extends in the axial direction opposite to the first cylindrical portion is formed integrally with the first cylindrical portion, and on the inner peripheral side of the second cylindrical portion, than the second cylindrical portion. An opening fitting convex portion that protrudes outward in the axial direction and presses the opening piece is formed, and an annular plate portion that extends radially outward from a connection portion between the first cylindrical portion and the second cylindrical portion. The annular plate portion is formed so that the diameter of the annular plate portion is larger than the diameter of the grounding portion formed to protrude from the lower end of the can body, and the first outer wall portion is substantially parallel to the first cylindrical portion. The second outer wall portion hangs down from the outer edge portion of the plate portion and on the side opposite to the first outer wall portion and outside the second cylindrical portion. A second temporary fixing protrusion is formed on the lower end of the first outer wall so as to be engaged with a tightening portion between the can body and the can lid, and the first cylindrical portion is outside the protruding portion. When the first outer wall portion is engaged with the winding portion of the can lid and the can body, the opening temporary sealing stopper is crowned on the can lid and a plurality of cans are stacked. Further, the grounding portion of the can stacked above the temporary opening sealing plug is in contact with the annular plate portion of the temporary opening sealing plug, and the second outer wall portion is a wall surface near the grounding portion of the stacked can. It is comprised so that it may contact | abut.
[0011]
Therefore, according to the first aspect of the present invention, the first temporary fixing protrusion is formed on the first cylindrical portion of the temporary opening sealing plug, whereby the temporary opening sealing plug is formed on the engaging protrusion of the can lid. The can body can be transported and sold in an engaged state. In addition, when the can lid is opened and the beverage in the can is directly taken from the can body, the concave portion of the can lid touched by the liquid content flowing down from the opening, the engaging protrusion, the portion in between, and the lower lip touch. Since the portion below the engaging protrusion is covered with the temporary opening sealing plug, foreign matter can be prevented from adhering to the engaging protrusions of the can lid during transportation / sales, which is hygienic. .
[0012]
In addition, when the opening fitting convex part of the temporary opening sealing plug is used to break and open the weakening line formed in the depression part of the projecting part, the weakening line is broken with the finger and the lid is opened. There is no possibility that the finger is injured or the liquid content such as beverage adheres to the finger. In addition, the weakened line can be broken and opened by pressing the opening piece without difficulty.
[0013]
Furthermore, after opening the lid, the opening of the can lid can be temporarily sealed with the temporary sealing plug, so that the beverage left over or the content liquid left over can be spilled as if the can body was tilted down. Can be prevented, and the temporarily sealed can can be carried.
[0014]
Furthermore, even if the bottom of the can is not formed by a special mold, it is possible to stack a plurality of cans having temporary opening sealing caps and display them at the store. In addition, since the temporary opening sealing plug can be integrally formed of a synthetic resin, the manufacturing cost can be reduced as compared with the case where the bottom of the can is formed by a special mold.
[0015]
According to a second aspect of the present invention, in addition to the first aspect of the invention, a second extending in parallel with the second cylindrical portion on the outer edge portion of the annular plate portion to the opposite side in the axial direction from the first outer wall portion. The outer wall portion is raised and formed, the first cylindrical portion is externally fitted to the projecting portion, and the first outer wall portion is engaged with the winding portion of the can lid and the can body. When a plurality of cans are stacked by attaching the opening temporary sealing stopper to the can lid, the grounding portion of the can stacked above the opening temporary sealing stopper is the annular plate portion of the opening temporary sealing stopper. The upper end of the second outer wall portion is in contact with the outer wall surface of the grounding portion of the stacked cans.
[0016]
Therefore, according to the invention of claim 2, when a plurality of cans are stacked, the grounding part of the cans stacked on the annular plate part comes into contact, and the grounding of the cans in which the upper end of the second outer wall part is stacked. Since it abuts against the wall surface portion outside the portion, another can with temporary opening sealing plug can be stably stacked on the can with temporary sealing plug. As a result, it is easy to display at the store at the time of sale, and can prevent the can from falling during the store display.
[0017]
Furthermore, the invention of claim 3 is claimed in claim 1's In addition to the invention, the first temporary cylindrical plug is fitted in the protruding portion, and the first outer wall portion is engaged with a tightening portion between the can lid and the can body. Is attached to the can lid, and a plurality of cans are stacked, the grounding portion of the can stacked above the temporary sealing plug is in contact with the annular plate portion of the temporary sealing plug, The upper end of the second outer wall portion is configured to come into contact with the inner wall surface of the grounding portion of the stacked cans.
[0018]
Therefore, according to the invention of claim 3, since the second outer wall portion raised from the annular plate portion is in contact with the inner wall surface of the grounding portion of the can, the second outer wall portion is made into a complete cylindrical shape. But the diameter can be reduced. As a result, the amount of resin used can be reduced when the temporary opening sealing plug is molded with a synthetic resin, and the manufacturing cost can be reduced.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of the present invention, in which an opening protruding can lid 1 and an opening temporary sealing plug 31 are shown. First, the opening protrusion can lid 1 will be described. The opening protruding can lid 1 is formed of a metal flat plate material (not shown) such as an aluminum alloy. Note that an inner surface coating (not shown) made of a synthetic resin is formed in advance on one surface of the flat plate material. This inner surface film is formed from a protective paint or a resin film. As the paint, any protective paint made of thermosetting and thermoplastic resin, for example, modified epoxy paint such as phenol-epoxy paint, amino-epoxy paint, vinyl chloride-vinyl acetate copolymer, epoxyphenol-modified-vinyl paint These are used alone or in combination of two or more, such as vinyl or modified vinyl paint. As the resin film, for example, polyethylene terephthalate (PET) is used as a basic component, and a copolymer such as polyethylene isophthalate (PEIT) can also be applied. Moreover, when a resin film is used for the inner surface coating, the resin film may be unstretched or biaxially stretched.
[0020]
A flange portion (not shown) of a well-known shape is formed on the outer peripheral side of the opening protruding can lid 1, and is wound and fixed to the opening of the cylindrical can body 21 to form the winding portion 2. Yes. Further, an outer peripheral groove 3 that is U-shaped and is recessed substantially downward in FIG. 1 is formed on the radially inner side of the opening protruding can lid 1 from the winding fastening portion 2.
[0021]
A skirt wall 4 is formed from the outer circumferential groove 3 toward the central axis of the can body 21 and extending upward in FIG. The skirt wall 4 extends so as to form an arc so that the cross section protrudes in the axial direction of the can body 21. Further, a ridge 5 is formed following the upper end of the skirt wall 4 in FIG. Further, an engagement protrusion 6 is formed at the upper end of the raised portion 5 in FIG.
[0022]
The engaging projection 6 has a radius formed by making the outer diameter of the portion slightly lowered from the top of the annular projecting portion protruding in the axial direction from the skirt wall 4 through the raised portion 5 smaller than the outer diameter of the top. It is a part protruding in the direction.
[0023]
Moreover, the top part of the protruding part 5 is made into the cyclic | annular flat surface of the predetermined width along a radial direction, and the contact surface 7 is formed here. Further, a recess 8 is formed on the inner peripheral side of the contact surface 7. An opening piece 9 is formed at the bottom of the recess 8. The opening piece 9 is partitioned into a substantially circular shape, with a part thereof being left by a weakening line 10 composed of a score line. Then, as shown in FIG. 2, the bottoms of the depressions 8 on both sides of the weakening line 10 are folded (or folded) so as to be tripled, and the weakening line 10 is folded into the bent depression. The portion 8 is formed at a position located on the lowermost side in FIG. Therefore, when the weakening line 10 is broken, the cut end surface on the opening side is positioned outside the inner end of the folded portion, so that the consumer does not injure fingers or the like at the cut end. Further, the weakening line 10 is formed on the outer peripheral side of the inner peripheral side tip portion of the bottom portion of the recessed portion 8 bent in triplicate, that is, the minimum inner diameter D1 portion. In addition, in order to improve lid opening property, you may cut | disconnect a part of weakening line 10 completely.
[0024]
Further, the plastisol 11 is applied from the lower side in FIG. 2 across the bottom of the recess 8 and the opening piece 9 across the weakening line 10. This plastisol 11 prevents the weakened line 10 from being broken by the change in the internal pressure of the can body, repairs damage to the coating film by forming the weakened line 10, and can protrude from the opening due to the intrusion of contents such as beverages. This is to prevent corrosion of the lid 1. By applying this plastisol 11, leakage of the content liquid can be prevented even if a part of the weakening line 10 is completely cut.
[0025]
Further, the opening piece 9 is formed with a convex portion 12 protruding upward in the figure. The convex portion 12 is formed so that the temporary opening sealing plug 31 can easily press the opening piece 9 when the can lid is opened.
[0026]
Next, the temporary opening sealing plug 31 will be described. The temporary opening sealing plug 31 is formed of a synthetic resin such as polyethylene resin or polypropylene resin. As shown in FIG. 1, a first outer wall portion 32 extending downward in FIG. . The first outer wall portion 32 is a cylindrical portion having substantially the same diameter as the tightening portion 2, and a fitting recess 33 that fits into the tightening portion 2 of the opening protruding can lid 1 is formed on the inner surface of the lower end. The opening temporary sealing plug 31 is formed over the circumferential direction. Below the fitting recess 33, a second temporary fixing protrusion 34 is formed to be fitted on the lower side in FIG. Accordingly, the fitting recess 33 is formed in a groove shape on the inner peripheral surface of the lower end of the first outer wall portion 32.
[0027]
In addition, a second outer wall portion 35 that protrudes in a direction opposite to the first outer wall portion 32 (upward in FIG. 1) is integrally formed on the outer peripheral portion of the opening temporary sealing plug 31. As will be described later, the second outer wall portion 35 has a shape that comes into contact with the bottom of the upper can stacked when the can body 21 to which the opening protruding can lid 1 is fixed is stacked for transportation, display, and the like. Is formed. Furthermore, an annular flat plate portion 36 extends in the radial direction of the opening temporary sealing plug 31 from between the second outer wall portion 35 and the first outer wall portion 32. In other words, the outer wall portions 32 and 35 are formed on the outer peripheral portion of the annular flat plate portion 36 so as to protrude in the axial direction.
[0028]
A first cylindrical portion 37 extending downward in FIG. 1 is formed at the central portion of the annular flat plate portion 36. The first cylindrical portion 37 is a cylindrical portion having an inner diameter substantially equal to the outer diameter of the engaging projection portion 6 described above, and a first temporary fixing projection portion 38 protruding inward in the radial direction is formed on the inner surface of the lower end. A plurality (four in the illustrated example) are formed at equal intervals. These first temporary fixing protrusions 38 are elastically deformed over the annular protrusions at the upper ends of the engagement protrusions 6 of the opening protrusion can lid 1 and are fitted into the annular recesses below, thereby temporarily closing the opening. A stopcock 31 is detachably attached to the opening protruding can lid 1.
[0029]
In addition, a second cylindrical portion 39 that protrudes in a direction opposite to the first cylindrical portion 37 (upward in FIG. 1) and has the same diameter as the first cylindrical portion 37 is formed at the center of the annular flat plate portion 36. ing. An opening fitting convex portion 45 is formed on the inner peripheral side of the second cylindrical portion 39. This opening fitting convex part 45 is a convex part which fits into the opening part 42 which arises as a result of pushing and opening the opening piece 9 and pushing the opening piece 9 described above, and is the base end part on the annular flat plate part 36 side. The tapered portion 40 has an outer diameter larger than the inner diameter of the opening 42 and an outer diameter of the tip portion smaller than the inner diameter of the opening 42. A plurality (four in the illustrated example) of temporary sealing protrusions 41 protruding outward in the radial direction are formed at a portion slightly smaller than the inner diameter of the opening 42 in the tapered portion 40. Has been.
[0030]
An inclined portion 43 having a larger taper angle is continuously formed at the distal end portion of the tapered portion 40, and the distal end portion of the inclined portion 43 is a flat pressing surface 44 along the radial direction.
[0031]
Next, the operation of the opening projecting can lid 1 and the temporary opening sealing plug 31 according to the present invention will be described. FIG. 1 shows a state in which the lid is not opened, and an opening temporary sealing plug 31 is attached to the opening projecting can lid 1 as shown in FIG. That is, the opening temporary sealing plug 31 is attached to the opening protruding can lid 1 with the opening fitting convex portion 45 facing outward. In this state, the first outer wall portion 32 is fitted onto the winding fastening portion 2, the winding fastening portion 2 enters the fitting recess 33, and the second temporary fixing projection 34 forming the fitting recess 33 is wound. Locked to the fastening portion 2.
[0032]
At the same time, the first cylindrical portion 37 is externally fitted to the engaging projection 6 formed on the tip side of the raised portion 5, and the first temporary fixing projection 38 at the tip is engaged with the engaging projection 6. is doing. As described above, when the fitting recess 33 is engaged with the winding tightening portion 2 and the first temporary fixing protrusion 38 is engaged with the engaging protrusion 6, the temporary opening sealing plug 31 is opened. The lid 1 is crowned with a predetermined strength.
[0033]
FIG. 3 shows a state in which an opening projecting can lid 1 is wound and secured to a two-piece can body 21 which is a bottomed can body 21 and a temporary sealing plug 31 is fitted and stacked for transportation or display. A can bottom 22 of a two-piece can placed on the temporary opening sealing plug 31 has a shape subjected to a normal doming process and has an annular grounding portion 23 protruding to the lower surface side. And a bottom wall portion 24 that reaches the can body 21 continuously to the outer peripheral portion, and a dome portion 25 on the inner peripheral side of the grounding portion 23. The grounded portion 23 of the upper can stacked up comes into contact with the annular flat plate portion 36, so that the can is placed on the temporary opening sealing plug 31. In that case, the depth in the doming process, in other words, the dimension in the axial direction from the center of the dome portion 25 to the top of the grounding portion 23 is larger than the height of the opening fitting convex portion 45 from the annular flat plate portion 36. The opening fitting convex portion 45 is in a state of being accommodated inside without contacting the dome portion 25.
[0034]
On the other hand, the second outer wall portion 35 comes into contact with the wall surface of the bottom wall portion 24, and the can bottom 22 is supported at the tip thereof. Accordingly, the upper can is stably stacked on the temporary opening sealing plug 31 without causing a lateral shift or inclination.
[0035]
Moreover, since the opening temporary sealing plug 31 is engaged with the winding fastening portion 2 between the opening protruding can lid 1 and the can body 21, the load acting via the opening temporary sealing plug 31 is lowered on the lower side. Therefore, the support strength is increased, and cans can be stacked in multiple stages. Further, the shape of the can bottom 22 may be a shape by a conventional doming process, so that it is not necessary to prepare a special bottom mold for forming the can bottom 22 with respect to the existing equipment. Since there is no need for replacement, an increase in manufacturing cost can be suppressed or avoided.
[0036]
Further, as shown in FIG. 1, when the first outer wall portion 32 is engaged with the winding fastening portion 2 of the opening protruding can lid 1, the entire opening protruding can lid 1 may be exposed to the outside. Is prevented. As a result, it is possible to prevent dust and dirt from adhering to the opening projecting can lid 1 during transportation and display, which is hygienic. It should be noted that the temporary opening sealing plug 31 may be shrink-wrapped with a transparent or opaque heat-shrinkable plastic film or the like so that dust does not adhere to or be tampered with during temporary display. .
[0037]
Next, the operation of opening and temporary sealing will be described. First, when shrink wrapping is performed, the wrapping is removed and the opening temporary sealing plug 31 is removed from the opening protruding can lid 1. This is because the opening temporary sealing plug 31 is formed of an elastic synthetic resin, so that the engagement recess 33 is formed by pulling the opening protruding can lid 1 upward while spreading the first outer wall 32 outward. Since it comes off from the winding part 2, it can carry out easily.
[0038]
Next, the temporary opening sealing plug 31 is held so that the pressing surface 44 faces the opening piece 9 of the opening protruding can lid 1, and then the pressing surface 44 of the opening temporary sealing plug 31 is opened to the opening protruding can. It is brought into contact with the opening piece 9 of the lid 1 and pressed. At this time, since the convex portion 12 is formed on the opening piece 9, the pressing surface 44 can be easily brought into contact with the opening piece 9 and pressed.
[0039]
When the opening piece 9 is pressed, the weakening line 10 breaks, the plastisol 11 is torn off, and the opening piece 9 is pushed down into the can body. If a portion where the weakening line 10 is completely cut is provided, the breakage proceeds from that point, so that the lid can be opened with a relatively small pressing force. In addition, since the both ends of the weakening line 10 are not connected, the part in which the weakening line 10 is not formed becomes a hinge, the opening piece 9 rotates, and it will be in the state suspended and pushed down (FIG. 4). reference). As a result, an opening 42 surrounded by the inner peripheral side tip portion of the portion folded in triplicate is generated.
[0040]
When the opening piece 9 is pushed down to form the opening 42, the consumer pulls the temporary opening sealing plug 31 fitted in the opening 42 away from the opening protruding can lid 1, and then tilts the can body to open the opening. It is possible to drink the beverage that has flowed down from 42 through the depression 8 and the contact surface 7. At that time, the consumer drinks the lower lip against the skirt wall 4, the raised portion 5, and the engaging projection 6 having a considerably smaller diameter than the can body 21 and the winding portion 2 of the opening protruding can lid 1. Since the outer diameter of the engaging protrusion is sufficiently smaller than the adult's mouth (35 mm or less), a normal easy open can lid with an opening formed below the tightening portion 2 is tightened. As in the case of drinking directly from the can, the consumer's nose does not collide with the tightening portion 2 or the cover plate surface, and the beverage can be drunk without spilling. It is also easy to pour the content liquid into a cup or the like. In addition, since a consumer's finger does not touch the opening piece 9 directly when opening a can lid, it can also prevent that content liquids, such as a drink, adhere to a finger.
[0041]
Further, the consumer can temporarily seal the opening 42 of the opening protruding can lid 1 using the opening temporary sealing plug 31. In this case, the pressing surface 44 of the opening temporary sealing stopper 31 is held toward the opening 42 of the opening protruding can lid 1, and the opening temporary sealing stopper 31 is fitted into the opening 42. Then, the temporarily sealing projection 41 formed on the tapered portion 40 of the opening temporary sealing plug 31 engages with the edge of the opening 42 of the opening protruding can lid 1 (see FIG. 5). As a result, the opening protruding can lid 1 is temporarily sealed by the opening temporary sealing plug 31. By forming the temporary sealing projection 41 on the taper portion 40, the opening temporary sealing plug 31 is fitted into the opening 42, and the opened opening protruding can lid 1 is easily temporarily sealed. Can do.
[0042]
Next, another example of the present invention will be described with reference to the drawings. In addition, about the member which has the same structure as said Example, the same reference number is attached | subjected and the description is abbreviate | omitted. As shown in FIG. 6, the temporary opening sealing plug 51 has an opening except that the second outer wall portion 52 is formed on the upper side in FIG. 6 between the first outer wall portion 32 and the first cylindrical portion 37. It has the same configuration as the temporary sealing plug 31. When the can body 21 is stacked in a state where the opening temporary sealing plug 51 is attached to the opening protruding can lid 1, the bottom wall on the inner peripheral side of the can bottom 22 of the can body 21 stacked on the upper side. The wall surface of the dome portion 25 is in contact with the second outer wall portion 52 of the temporary opening sealing plug 51.
[0043]
As a result, even if the can body 21 is stacked in five stages and stored in the lowermost stage, the opening temporary sealing plug 51 is partially deformed and detached from the opening protruding can lid 1 or the opening protruding can lid 1. The opening piece 9 is not pushed down to open the opening protruding can lid 1. In addition, the opening temporary sealing plug 51 has a smaller amount of resin used to form the second outer wall portion 52 because the diameter of the second outer wall portion 52 is shorter than the temporary opening sealing plug 31 in the above example. Therefore, the manufacturing cost can be further reduced.
[0044]
Instead of the second outer wall portions 35 and 52, cylindrical portions cut out at some places or convex portions provided at substantially equal intervals on the same circumference may be used. Even such a convex part can support the load received by the temporary opening sealing plugs 31 and 51 when palletized.
[0045]
In the above embodiment, an example using the score line as the weakening line has been described. However, the metal plate is once cut into a predetermined shape, leaving the hinge portion, and then the cut portion is joined and sealed with a sealant to weaken A line may be formed, and the can body is not limited to a two-piece can body, and may be a three-piece can body having a can lid wound around the other end.
[0046]
【The invention's effect】
As described above, in the first aspect of the present invention, the first temporary fixing protrusion is formed on the first cylindrical portion of the temporary opening sealing plug, so that the temporary opening stopper can be opened. The can body can be transported and displayed in a state of being engaged with the engaging protrusion of the lid. In addition, when opening the opening protruding can lid and drinking the beverage in the can directly from the can body, the recessed portion of the opening protruding can lid that touches the liquid content flowing down from the opening, the engaging protrusion, and the gap therebetween Since the portion is covered with the temporary opening sealing plug, it is possible to prevent foreign matters from adhering to the engaging projections and the like of the can lid during transportation and display, which is hygienic.
[0047]
In addition, when the opening fitting convex part of the temporary opening sealing plug is used to break and open the weakening line formed in the depression part of the projecting part, the weakening line is broken with the finger and the lid is opened. There is no possibility that the finger is injured or the liquid content such as beverage adheres to the finger. In addition, the weakened line can be broken and opened by pressing the opening piece without difficulty.
[0048]
Furthermore, after opening the lid, the opening portion of the opening protruding can lid can be temporarily sealed with the opening temporary sealing plug, so that the beverage left over or the content liquid left over can be used as if the can body was tilted down. It is possible to prevent spilling, and to carry a temporarily sealed can body.
[0049]
Furthermore, it is possible to stack a plurality of cans each having a temporary opening sealing cap crowned without forming the bottom of the can with a special mold. In addition, since the temporary opening sealing plug can be integrally formed of a synthetic resin, the manufacturing cost can be reduced as compared with the case where the bottom of the can is formed by a special mold.
[0050]
Further, in the invention of claim 2, when a plurality of cans are stacked, the grounding portion of the can stacked on the annular plate portion comes into contact, and the upper end of the second outer wall portion is stacked on the grounding portion of the can. Since it abuts against the outer wall surface, it is possible to stably stack other cans with temporary sealing plugs on the cans. As a result, it is easy to display at the store at the time of sale, and can prevent the can from falling during the display.
[0051]
Furthermore, in the invention of claim 3, since the second outer wall portion rising from the annular plate portion is in contact with the inner wall surface of the grounding portion of the can, even when the second outer wall portion is made into a complete cylindrical shape, the diameter is reduced. can do. As a result, the amount of resin used can be reduced when the temporary opening sealing plug is molded with a synthetic resin, and the manufacturing cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an opening protruding can lid and an opening temporary sealing stopper of a can with an opening temporary sealing stopper that is an embodiment of the present invention.
FIG. 2 is a partial cross-sectional view showing the vicinity of a weakening line before opening the lid.
FIG. 3 is a cross-sectional view showing a state where the can bottom of the can with the temporary sealing plug is brought into contact with the upper side of the temporary sealing plug and stacked.
FIG. 4 is a cross-sectional view showing an opening projecting can lid and an opening temporary sealing stopper of the can with an opening temporary sealing stopper after opening.
FIG. 5 is a partial cross-sectional view showing the vicinity of a weakened line in a state where the opening is temporarily sealed with an opening temporary sealing plug after the lid is opened.
FIG. 6 shows another embodiment of the present invention, in which an opening protruding can lid and an opening temporary sealing plug of a can with an opening temporary sealing plug are placed on the upper side of the opening temporary sealing plug. It is sectional drawing which shows the state which contacted the bottom of the can and was piled up.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Opening part protrusion can lid, 6 ... Engagement projection part, 7 ... Contact surface, 8 ... Depression part, 9 ... Opening piece, 10 ... Weakening line, 11 ... Plastisol, 12 ... Convex part, 21 ... Can body, 22 ... Can bottom, 23 ... Grounding part, 24 ... Bottom wall part, 25 ... Dome part, 31, 51 ... Temporary sealing plug, 32 ... First outer wall part, 33 ... Fitting recess, 34 ... Second temporary fixing protrusion 35, 52 ... second outer wall portion, 36 ... annular flat plate portion, 37 ... first cylindrical portion, 38 ... first temporary fixing projection portion, 39 ... second cylindrical portion, 40 ... taper portion, 41 ... temporary sealing Projection part, 42 ... opening part, 44 ... pressing surface, 45 ... opening fitting convex part.

Claims

The can lid is integrated with the can body by winding and fixing the flange portion formed on the outer peripheral edge to the opening of the can body, and the protruding portion protruding in the axial direction from the flange portion at the center of the can lid Is formed on the inner peripheral side of the projecting portion, and a recess portion that is recessed from the outer peripheral edge of the projecting portion is formed. A substantially circular opening piece partitioned by a line is provided, and a lid plate portion outside the opening piece is folded so as to cover at least the weakening line portion, and an opening temporary sealing plug is provided at the protruding portion of the can lid. In the crowned can with an opening temporary sealing stopper,
An engagement protrusion including a groove with which the opening temporary sealing plug is engaged is formed at least partially on the outer periphery of the tip of the protrusion,
The opening temporary sealing plug includes a first cylindrical portion that is externally fitted to the protruding portion, and a first temporary fixing protrusion that engages with the engaging protruding portion protrudes from the inner peripheral surface of the first cylindrical portion. Formed,
A second cylindrical portion that extends in the axial direction opposite to the first cylindrical portion is formed integrally with the first cylindrical portion, and on the inner peripheral side of the second cylindrical portion, than the second cylindrical portion. An opening fitting convex portion that protrudes outward in the axial direction and presses the opening piece is formed,
An annular plate portion extending radially outward from the connecting portion between the first cylindrical portion and the second cylindrical portion is formed,
A diameter of the annular plate portion is larger than a diameter of a grounding portion formed to protrude from a lower end of the can body, and an outer edge portion of the annular plate portion is substantially parallel to the first cylindrical portion. And the second outer wall portion is raised outside the second cylindrical portion on the opposite side of the first outer wall portion,
A second temporary fixing protrusion is formed at the lower end of the first outer wall to engage with the winding portion of the can body and the can lid;
The first temporary cylindrical plug is fitted onto the can lid in a state where the first cylindrical portion is fitted onto the protruding portion, and the first outer wall portion is engaged with a winding fastening portion between the can lid and the can body. When a plurality of cans are stacked and stacked, the grounding part of the can stacked above the temporary sealing plug of the opening comes into contact with the annular plate part of the temporary sealing plug of the opening,
The can with an opening temporary sealing stopper, wherein the second outer wall portion is configured to abut against a wall surface in the vicinity of a grounding portion of the stacked can.

A second outer wall portion extending in parallel with the second cylindrical portion is formed on the outer edge portion of the annular plate portion so as to extend in the axial direction opposite to the first outer wall portion,
The first temporary cylindrical plug is fitted onto the can lid in a state where the first cylindrical portion is fitted onto the protruding portion, and the first outer wall portion is engaged with a winding fastening portion between the can lid and the can body. When a plurality of cans are stacked on top of each other, the grounding portion of the can stacked above the temporary opening sealing plug comes into contact with the annular plate portion of the temporary opening sealing plug, and the second outer wall portion The can with temporary opening sealing cap according to claim 1, wherein the upper end is configured to abut against a wall surface outside the grounding portion of the stacked cans.

The first temporary cylindrical plug is fitted onto the can lid in a state where the first cylindrical portion is fitted onto the protruding portion, and the first outer wall portion is engaged with a winding fastening portion between the can lid and the can body. When a plurality of cans are stacked on top of each other, the grounding portion of the can stacked above the temporary opening sealing plug comes into contact with the annular plate portion of the temporary opening sealing plug, and the second outer wall portion The can with temporary opening sealing cap according to claim 1, wherein the upper end is configured to abut against a wall surface inside the grounding portion of the stacked cans.