JP2007269363A

JP2007269363A - Cap, bottle can with cap, and manufacturing method of cap

Info

Publication number: JP2007269363A
Application number: JP2006097186A
Authority: JP
Inventors: Munetaka Ida; 宗孝井田; Yasushi Fujiwara; 康藤原; Eiji Yamamoto; 栄治山本
Original assignee: Universal Can Corp
Current assignee: Altemira Can Co Ltd
Priority date: 2006-03-31
Filing date: 2006-03-31
Publication date: 2007-10-18

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cap capable of preventing an abnormal increase of the inner pressure of a bottle can, the bottle can with the cap, and a manufacturing method of the cap. <P>SOLUTION: Since a recessed coining part 17 is formed so as to correspond to a seal part 14 on the inner surface 12 of a top plate 5, it is possible to exactly keep a space between a top 4a of a mouth and the top plate 5 by the amount of the recessed space of the coining part 17 even after conducting draw-forming to the top plate 5, and to thin the top plate 5 by the amount of the recessed space of the coining part 17. Accordingly, a force for the top plate 5 to push the seal part 14 is reduced. As a result, surface pressure between a cap body 7 and the top 4a of a mouth is reduced and the seal part 14 is deformed by the inner pressure of the bottle can 2 to release the inner pressure. In this way, it is possible to prevent the abnormal increase of the inner pressure of the bottle can 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明はキャップ、キャップ付ボトル缶及びキャップ製造方法に関し、例えばスポーツドリンク等の清涼飲料水やコーヒ等の飲み物を封入して販売するためのキャップ付ボトル缶に適用して好適なものである。 The present invention relates to a cap, a bottle with a cap, and a cap manufacturing method, and is suitable for application to a bottle can with a cap for selling, for example, a soft drink such as a sports drink or a drink such as coffee.

近年、飲料容器として、ガラスや合成樹脂製のものに代え、アルミニウム等の金属製でなるボトル缶が用いられており、これに伴い、ボトル缶を閉止するキャップ（以下、これを飲料容器用キャップと呼ぶ）についてもアルミニウム等の金属製で形成されたものが用いられている。 In recent years, bottled cans made of metal such as aluminum have been used as beverage containers instead of glass or synthetic resin. Along with this, caps for closing bottle cans (hereinafter referred to as beverage container caps). Also, those formed of a metal such as aluminum are used.

そして、このような飲料容器用キャップは、円板状の天板部と、当該天板部の周縁から垂下した筒部とからなるキャップ本体を有し、比較的軟質の合成樹脂材で成形されたライナが当該天板部の内表面に設けられ、このライナが閉止時にボトル缶の口部頂点に当接して容器内部を密封し得るようになされている。 Such a beverage container cap has a cap body composed of a disk-shaped top plate portion and a cylindrical portion hanging from the periphery of the top plate portion, and is formed of a relatively soft synthetic resin material. A liner is provided on the inner surface of the top plate portion, and when the liner is closed, the inside of the container can be sealed by contacting the top of the mouth of the bottle can.

しかしながら、ボトル缶に収容されている内容物が、天然果汁を含む飲料等の発酵性のある液体やビール等の酒類、コーラ等の炭酸飲料等の場合には、ボトル缶の内圧が異常に上昇することもあり、開栓時に飲料容器用キャップが飛翔する等の問題が生じる虞があった。 However, when the contents contained in the bottle can are fermentable liquids such as beverages containing natural fruit juice, alcoholic beverages such as beer, carbonated beverages such as cola, etc., the internal pressure of the bottle cans rises abnormally. In some cases, the beverage container cap may fly when the cap is opened.

そこで、このような問題点を解決するため、特開２００４−２９１９８３号公報では、ライナにおけるシール部の外表面に複数の切欠き部を形成し、当該切欠き部においてボトル缶の口部頂点との接触面積を減少させた飲料容器用キャップが考えられている（例えば特許文献１参照）。 Therefore, in order to solve such a problem, in Japanese Patent Application Laid-Open No. 2004-291983, a plurality of notches are formed on the outer surface of the seal portion in the liner, and the mouth portion apex of the bottle can is formed in the notch. A beverage container cap having a reduced contact area has been considered (see, for example, Patent Document 1).

この場合、かかる構成の飲料容器用キャップでは、切欠き部によってキャップ本体と口部頂点との間の面圧を低下させることができるので、ボトル缶の内圧が所定値に達したとき、この面圧が低い切欠き部を介してボトル缶の内圧を外部に開放し得るようになされている。 In this case, in the beverage container cap having such a configuration, the surface pressure between the cap body and the top of the mouth can be reduced by the notch, so that when the internal pressure of the bottle can reaches a predetermined value, this surface The internal pressure of the bottle can can be released to the outside through a notch portion having a low pressure.

かくして飲料容器用キャップでは、容器に収容されている内容物が、発酵性のある液体等であっても、ボトル缶の内圧が異常に上昇することを未然に回避でき、かくして開栓時に飲料容器用キャップが飛翔する等の問題が生じることを防止し得るようになされている。 Thus, in the beverage container cap, even if the contents contained in the container is a fermentable liquid, etc., it is possible to avoid an abnormal increase in the internal pressure of the bottle can, and thus the beverage container when opened It is possible to prevent the occurrence of problems such as flying caps.

ところで、このような飲料容器用キャップは、天板部にライナを設けたキャップ本体を、ボトル缶の口部に被せ、当該天板部の周縁に絞り加工を施すことにより、天板部の周縁部分が小径に絞られてキャップ本体の内側に凹む段差部が形成される。このようにして飲料容器用キャップは、段差部の内表面に設けられているライナのシール部を、ボトル缶の口部頂点に密着させてボトル缶を密封し得るようになされている。
特開２００４−２９１９８３号公報 By the way, such a cap for a beverage container is obtained by placing a cap body provided with a liner on the top plate portion on the mouth portion of the bottle can, and drawing the peripheral edge of the top plate portion to obtain a peripheral edge of the top plate portion. The step is narrowed to a small diameter to form a stepped portion that is recessed inside the cap body. Thus, the cap for beverage containers can seal a bottle can by sticking the seal part of the liner provided in the inner surface of a level | step-difference part to the opening | mouth vertex of a bottle can.
JP 2004-291983 A

しかしながら、かかる構成のライナのシール部は、このような絞り加工が実際に天板部に施されて段差部が形成されると、切欠き部の切欠いた空間が潰れる等して所望の形状に変形しないこともあり、切欠き部においてキャップ本体と口部頂点との間の面圧が低下しない虞がある。 However, the liner seal portion having such a configuration, when such a drawing process is actually applied to the top plate portion to form a stepped portion, the notched space of the notch portion is crushed or the like into a desired shape. There is a possibility that the surface pressure between the cap body and the top of the mouth portion does not decrease at the notch.

この場合飲料容器用キャップでは、ボトル缶内の内圧が所定値に達しても、切欠き部を介してボトル缶の内圧が外部に開放されない虞もあり、ボトル缶の内圧が異常に上昇してしまうという問題があった。 In this case, in the beverage container cap, even if the internal pressure in the bottle can reaches a predetermined value, the internal pressure of the bottle can may not be released to the outside through the notch, and the internal pressure of the bottle can rises abnormally. There was a problem that.

本発明は、以上の問題点を考慮してなされたもので、ボトル缶の内圧が異常に上昇することを防止できるキャップ、キャップ付ボトル缶及びキャップ製造方法を提案しようとするものである。 The present invention has been made in view of the above problems, and intends to propose a cap, a bottle can with a cap, and a cap manufacturing method that can prevent the internal pressure of the bottle can from rising abnormally.

本発明の請求項１記載のキャップは、天板部の周縁から筒部が垂下したキャップ本体と、前記天板部の内表面に設けられたライナとを備え、前記ライナには容器の口部頂点に当接するシール部が設けられたキャップにおいて、前記天板部の内表面には、前記シール部と対向する位置に、前記キャップ本体の厚さ方向に凹む凹部が形成されていることを特徴とするものである。 A cap according to a first aspect of the present invention includes a cap body in which a cylindrical portion hangs from a peripheral edge of a top plate portion, and a liner provided on an inner surface of the top plate portion, and the liner includes a mouth portion of a container. In the cap provided with the seal portion that contacts the apex, a concave portion that is recessed in the thickness direction of the cap body is formed on the inner surface of the top plate portion at a position facing the seal portion. It is what.

また、本発明の請求項２記載のキャップは、前記シール部には前記天板部との接触面側に前記凹部と対応させて凸部が形成されていることを特徴とするものである。 The cap according to claim 2 of the present invention is characterized in that a convex portion is formed on the seal portion so as to correspond to the concave portion on the contact surface side with the top plate portion.

また、本発明の請求項３記載のキャップ付ボトル缶は、天板部の周縁から筒部が垂下したキャップ本体と、前記天板部の内表面に設けられたライナとを備えたキャップと、前記キャップにより口部が閉止されるボトル缶とから構成されたキャップ付ボトル缶において、前記キャップには、前記ライナに前記ボトル缶の口部頂点と当接するシール部が設けられ、前記天板部の内表面には、前記シール部と対向する位置に、前記キャップ本体の厚さ方向に凹む凹部が形成されていることを特徴とするものである。 Moreover, the bottle can with a cap according to claim 3 of the present invention is a cap provided with a cap body in which a cylindrical portion hangs down from a peripheral edge of the top plate portion, and a liner provided on the inner surface of the top plate portion; In the bottle can with a cap that is configured by a bottle can whose mouth is closed by the cap, the cap is provided with a seal portion that contacts the top of the mouth of the bottle can on the liner, and the top plate portion A concave portion that is recessed in the thickness direction of the cap body is formed on the inner surface of the cap body at a position facing the seal portion.

また、本発明の請求項４記載のキャップ付ボトル缶は、前記シール部には前記天板部との接触面側に前記凹部と対応させて凸部が形成されていることを特徴とするものである。 Moreover, the bottled can with a cap according to claim 4 of the present invention is characterized in that a convex portion is formed in the seal portion so as to correspond to the concave portion on the contact surface side with the top plate portion. It is.

また、本発明の請求項５記載のキャップ製造方法は、天板部の周縁から筒部が垂下したキャップ本体と、前記天板部の内表面に設けられたライナとを備え、前記ライナには容器の口部頂点に当接するシール部が設けられたキャップのキャップ製造方法において、前記天板部の内表面における前記シール部と対向する位置に、前記キャップ本体の厚さ方向に凹む凹部を形成する形成ステップを備えることを特徴とするものである。 According to a fifth aspect of the present invention, there is provided a cap manufacturing method comprising: a cap body having a cylindrical portion depending from a peripheral edge of the top plate portion; and a liner provided on an inner surface of the top plate portion; In the cap manufacturing method of a cap provided with a seal portion that contacts the top of the mouth of the container, a concave portion that is recessed in the thickness direction of the cap body is formed at a position facing the seal portion on the inner surface of the top plate portion. And a forming step.

また、本発明の請求項６記載のキャップ製造方法は、前記凹部が形成された前記天板部の内表面に溶融した合成樹脂材を供給し、前記合成樹脂材を押し広げて前記ライナを成形するライナ成形ステップを備えることを特徴とするものである。 In the cap manufacturing method according to claim 6 of the present invention, a molten synthetic resin material is supplied to the inner surface of the top plate portion where the concave portion is formed, and the synthetic resin material is expanded to form the liner. A liner forming step is provided.

本発明の請求項１記載のキャップ及び請求項３記載のキャップ付ボトル缶によれば、天板部に絞り加工が施された後であっても、口部頂点と天板部との距離を凹部の分だけ確実に確保できるとともに、当該凹部の分だけ天板部の厚みを薄くできることから、天板部がシール部を押し付ける力を低減でき、その結果キャップ本体と口部頂点との間の面圧が低下し、ボトル缶の内圧によってシール部を変形させて当該内圧を容易に開放させることができ、かくしてボトル缶の内圧が異常に上昇することを防止できる。 According to the cap according to claim 1 of the present invention and the bottle can with cap according to claim 3, the distance between the top of the mouth and the top plate even after the top plate is drawn. Since the thickness of the top plate portion can be ensured by the amount of the concave portion, and the thickness of the top plate portion can be reduced by the amount of the concave portion, the force with which the top plate portion presses the seal portion can be reduced. The surface pressure decreases, the seal portion is deformed by the internal pressure of the bottle can, and the internal pressure can be easily released, and thus the internal pressure of the bottle can can be prevented from rising abnormally.

また、本発明の請求項２記載のキャップ及び請求項４記載のキャップ付ボトルによれば、天板部の内表面に凹んだ凹部を形成し、当該凹部の分だけシール部の厚みを厚くしたことにより、シール部が閉止時に口部頂点と当接して容器内部を確実に密封できるとともに、ボトル缶の内圧によってシール部が容易に変形し、ボトル缶外に内圧を確実に開放させることができる。 Moreover, according to the cap of Claim 2 of this invention and the bottle with a cap of Claim 4, the recessed part recessed in the inner surface of the top-plate part was formed, and the thickness of the seal part was thickened by the part of the said recessed part As a result, when the seal portion is closed, the inside of the container can be reliably sealed by abutting with the apex of the mouth portion, and the seal portion can be easily deformed by the internal pressure of the bottle can, and the internal pressure can be reliably released outside the bottle can. .

また、本発明の請求項５記載のキャップ製造方法によれば、キャップにおける天板部の内表面に、シール部と対向させた凹部を形成できる。従って、天板部に絞り加工が施された後であっても、凹部の分だけ口部頂点との距離を確保するとともに、当該凹部の分だけ天板部の厚みを薄くして、キャップ本体と口部頂点との間の面圧を確実に低下させ、ボトル缶に内圧を容易に開放させ得るキャップを製造できる。 Moreover, according to the cap manufacturing method of Claim 5 of this invention, the recessed part made to oppose a seal part can be formed in the inner surface of the top-plate part in a cap. Therefore, even after the top plate is drawn, the distance from the top of the mouth is ensured by the amount of the concave portion, and the thickness of the top plate is reduced by the amount of the concave portion. It is possible to manufacture a cap that can reliably reduce the surface pressure between the lip and the top of the mouth and can easily release the internal pressure to the bottle can.

また、本発明の請求項６記載のキャップ製造方法によれば、ライナ成形ステップによって天板部の内表面において合成樹脂材押し広げてゆきライナを成形するようにしたことにより、シール部に凹部と対応させて凸部を形成できる。従って、凹部の分だけシール部の厚みが厚くなり、シール部が閉止時に口部頂点と当接して容器内部を確実に密封し得るとともに、ボトル缶外に内圧を確実に開放し得るキャップを製造できる。 According to the cap manufacturing method of claim 6 of the present invention, the liner is formed by spreading and spreading the synthetic resin material on the inner surface of the top plate portion by the liner molding step. Corresponding protrusions can be formed. Therefore, the thickness of the sealing part is increased by the amount of the concave part, and when the sealing part is closed, a cap that can contact the apex of the mouth part to reliably seal the inside of the container and reliably release the internal pressure outside the bottle can is manufactured. it can.

以下、本発明の実施の形態について、図面を参照しながら説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１において、１は本発明のキャップ付ボトル缶を示し、このキャップ付ボトル缶１は、全体がアルミニウムやアルミニウム合金等の金属製でなり、購入者が片手で保持できる大きさでなるボトル缶２と、当該ボトル缶２を閉止するための飲料容器用キャップ３とで構成されている。 In FIG. 1, reference numeral 1 denotes a bottle can with a cap according to the present invention. The bottle can with a cap 1 is entirely made of a metal such as aluminum or an aluminum alloy, and has a size that can be held by a purchaser with one hand. 2 and a cap 3 for a beverage container for closing the bottle can 2.

実際上、このキャップ付ボトル缶１は、ボトル缶２の口部４に短有底筒状の飲料容器用キャップ３が成形装置（図示せず）によって被着され、ボトル缶２内を密封し得るようになされている。 In practice, the bottled can 1 with a cap has a short bottomed cylindrical beverage container cap 3 attached to the mouth 4 of the bottle can 2 by a molding device (not shown) to seal the inside of the bottle can 2. Has been made to get.

飲料容器用キャップ３は、円板状の天板部５と、この天板部５の周縁から垂下した筒部６とから構成されたキャップ本体７を有する。ここで天板部５は、円形状でなる平坦部８を備え、この平坦部８の周縁に角部形成部９を有するとともに、当該角部形成部９の周縁に絞り加工が行われる加工領域10を有する。 The cap 3 for beverage containers has a cap body 7 composed of a disk-shaped top plate portion 5 and a cylindrical portion 6 hanging from the periphery of the top plate portion 5. Here, the top plate portion 5 includes a circular flat portion 8, and has a corner forming portion 9 on the periphery of the flat portion 8, and a processing region in which drawing processing is performed on the periphery of the corner portion forming portion 9. Has 10.

ここで加工領域10には、図２に示すように、角部形成部９が折り曲げられて、ボトル缶２の口部４側に凹む段差部11が形成されている。ここで天板部５は、その内表面12に例えばポリプロピレンとゴムとを混合したものやポリエチレン、ＥＶＡ（エチレン酢酸ビニル共重合体）等のような比較的軟質の合成樹脂材で成形されたライナ13を有し、このライナ13の周縁に設けたシール部14を段差部11によってボトル缶２の口部頂点4aに密着させ、当該ボトル缶２内を確実に密封し得るようになされている。 Here, in the processing region 10, as shown in FIG. 2, the corner portion forming portion 9 is bent to form a step portion 11 that is recessed toward the mouth portion 4 side of the bottle can 2. Here, the top plate portion 5 is a liner formed of a relatively soft synthetic resin material such as a mixture of polypropylene and rubber, polyethylene, EVA (ethylene vinyl acetate copolymer) or the like on the inner surface 12 thereof. 13, a seal portion 14 provided on the periphery of the liner 13 is brought into close contact with the mouth apex 4 a of the bottle can 2 by the step portion 11 so that the inside of the bottle can 2 can be reliably sealed.

かかる構成に加えて加工領域10、角部形成部９及び平坦部８の周縁部分からなり、シール部14に対向する環状の領域（以下、これらをまとめて単にシール部対向領域と呼ぶ）16には、長方形状でなり、キャップ本体７の厚さ方向に凹む凹部（以下、これをコイニング部と呼ぶ）17が内表面12に散在して形成されている。 In addition to such a configuration, the processing region 10, the corner portion forming portion 9, and the peripheral portion of the flat portion 8 are formed into an annular region 16 (hereinafter collectively referred to as a seal portion facing region) that faces the seal portion 14. Is formed in a rectangular shape, and recessed portions (hereinafter referred to as coining portions) 17 that are recessed in the thickness direction of the cap body 7 are scattered on the inner surface 12.

これら各コイニング部17は、ボトル缶２の口部４にキャップ本体７を被着させた際に、当該口部４の口部頂点4aと対向するようになされている。ここでコイニング部17の凹んだ空間内には、隙間を有しないようにライナ13のシール部14が設けられている。実際上、シール部14には、天板部５と接触する接触面22にコイニング部17と同一形状でなる凸部23が設けられ、この凸部23がコイニング部17の凹んだ空間内に配置されている。 Each of these coining portions 17 is configured to face the mouth portion apex 4a of the mouth portion 4 when the cap body 7 is attached to the mouth portion 4 of the bottle can 2. Here, the seal portion 14 of the liner 13 is provided in the recessed space of the coining portion 17 so as not to have a gap. In practice, the seal portion 14 is provided with a convex portion 23 having the same shape as the coining portion 17 on the contact surface 22 that comes into contact with the top plate portion 5, and this convex portion 23 is disposed in the recessed space of the coining portion 17. Has been.

すなわちシール部14は、凸部23の分だけ厚さがその周囲に比して厚く、面圧が下降する厚膜部24と、厚さが当該厚膜部24に比して薄い薄膜部25とが順次交互に形成され得る（図１）。また、ライナ13のシール部14は、厚膜部24がコイニング部17に配置されていることから、その外表面26において内周縁部19から外周縁部20まで凸部23の形状が露出せず滑らかに形成されている。 That is, the seal part 14 is thicker than the surroundings by the convex part 23, and the thin film part 25 is thinner than the thick film part 24. Can be formed alternately one after another (FIG. 1). Further, since the seal portion 14 of the liner 13 has the thick film portion 24 disposed on the coining portion 17, the shape of the convex portion 23 is not exposed from the inner peripheral edge portion 19 to the outer peripheral edge portion 20 on the outer surface 26 thereof. It is formed smoothly.

ところで、キャッピング装置（図示せず）によってボトル缶２の口部４に飲料容器用キャップ３を被着する前においては、当該キャッピング装置によって加工領域10に対し絞り加工が施されていないことから、図３に示すように、加工領域10は段差部11（図１）を有さずに平坦部８とほぼ同一平面状となっている。この場合、ライナ13のシール部14は、加工領域10が平坦部８とほぼ同一平面状に形成されていることから、その外表面26が厚膜部24及び薄膜部25においてほぼ同一平面状となり平坦に形成され得る。 By the way, before the beverage container cap 3 is attached to the mouth portion 4 of the bottle can 2 by a capping device (not shown), the capping device is not drawn to the processing region 10. As shown in FIG. 3, the processing region 10 does not have the step portion 11 (FIG. 1) and is substantially flush with the flat portion 8. In this case, the seal portion 14 of the liner 13 is formed so that the processing region 10 is substantially flush with the flat portion 8, so that the outer surface 26 is substantially flush with the thick film portion 24 and the thin film portion 25. It can be formed flat.

この実施の形態の場合、シール部14と対向する位置となるシール部対向領域16には、図４に示すように、複数のコイニング部17がその長手方向を天板部５の中心点30（図１）側に向けて周方向に沿って配置され、当該中心点30を中心に放射状に設けられている。また、シール部対向領域16には、隣接するコイニング部17の中心軸間の距離（以下、これをコイニングピッチと呼ぶ）ｄが等間隔となるように各コイニング部17が規則的に設けられている。 In the case of this embodiment, as shown in FIG. 4, the plurality of coining portions 17 are arranged at the center point 30 (the center point 30 ( FIG. 1) is arranged along the circumferential direction toward the side, and is provided radially around the center point 30. Further, in the seal portion facing region 16, each coining portion 17 is regularly provided so that distances between the central axes of the adjacent coining portions 17 (hereinafter referred to as coining pitch) d are equally spaced. Yes.

実際上、コイニング部17は、図３及び図４に示すように、天板部５の内表面12においてキャップ本体７の厚さ方向に凹んだ長方形状の底面部31と、この底面部35の周縁を取り囲み、当該底面部31に対して直角に設けられた平面状の周壁部32とにより構成され、これら底面部31及び周壁部32によって凹んだ箱状に形成されている。 3 and 4, the coining portion 17 has a rectangular bottom surface portion 31 recessed in the thickness direction of the cap body 7 on the inner surface 12 of the top plate portion 5, and the bottom surface portion 35. It is constituted by a planar peripheral wall portion 32 that surrounds the periphery and is provided at right angles to the bottom surface portion 31, and is formed in a box shape that is recessed by the bottom surface portion 31 and the peripheral wall portion 32.

また、コイニング部17は、ボトル缶２の口部頂点4aの湾曲形状部分に亘って設けられるようにその長手方向の長さが選定され、加工領域10だけでなく、角部形成部９の周辺においてもライナ13のシール部14を厚く形成させ得るようになされている。 Further, the coining portion 17 is selected in length in the longitudinal direction so as to be provided over the curved portion of the mouth portion apex 4a of the bottle can 2, and not only the processing region 10 but also the periphery of the corner portion forming portion 9 is provided. In this case, the seal portion 14 of the liner 13 can be formed thick.

なお、このコイニング部17は、図２に示したように、天板部５の内表面12において、短手方向の一端33がシール部14の内周縁部19と対向する位置（平坦部８の周縁部分）に有するとともに、短手方向の他端35が段差部11に有し、ボトル缶２の口部頂点4a及びライナ13のシール部14に合わせて形成されている。 As shown in FIG. 2, the coining portion 17 is located on the inner surface 12 of the top plate portion 5 at a position where one end 33 in the short direction faces the inner peripheral edge portion 19 of the seal portion 14 (the flat portion 8. The other end 35 in the lateral direction is provided in the step portion 11 and is formed in accordance with the mouth vertex 4 a of the bottle can 2 and the seal portion 14 of the liner 13.

このようにしてコイニング部17は、口部頂点4aと天板部５との距離を凹ませた分だけ遠ざけ、かつ当該凹ませた分だけ天板部５の厚みを薄くさせることにより、天板部５がシール部14を押し付ける力を低減させ、その結果キャップ本体７と口部頂点4aとの間の面圧を低下させ得るようになされている。 In this manner, the coining unit 17 increases the distance between the mouth apex 4a and the top plate part 5 by the recessed portion and decreases the thickness of the top plate portion 5 by the recessed portion. The portion 5 reduces the force with which the seal portion 14 is pressed, and as a result, the surface pressure between the cap body 7 and the mouth apex 4a can be reduced.

かくしてライナ13のシール部14は、ボトル缶の内圧が上昇すると、コイニング部17に対応して設けられた厚膜部24から当該ボトル缶２の内圧を外部へ開放し得るように構成されている。 Thus, the seal portion 14 of the liner 13 is configured to release the internal pressure of the bottle can 2 to the outside from the thick film portion 24 provided corresponding to the coining portion 17 when the internal pressure of the bottle can rises. .

また、この実施の形態の場合、コイニング部17は、図３及び図４に示したように、飲料容器用キャップ３の周方向に延びる幅（以下、これをコイニング幅と呼ぶ）ａと、飲料容器用キャップ３の半径方向に延びる長さ（以下、これをコイニング長さと呼ぶ）ｂと、コイニングピッチｄとをそれぞれ所定の寸法に選定することにより、シール部14の厚膜部24での面圧を下降させてボトル缶２の内圧開放圧を低くしつつ、シール角度が小さくなり過ぎることを防止し得るようになされている。 In the case of this embodiment, as shown in FIGS. 3 and 4, the coining portion 17 has a width a extending in the circumferential direction of the beverage container cap 3 (hereinafter referred to as a coining width) a, a beverage The surface of the seal portion 14 at the thick film portion 24 is selected by selecting a length b (hereinafter referred to as a coining length) b and a coining pitch d of the container cap 3 in the radial direction and predetermined dimensions, respectively. While the pressure is lowered to lower the internal pressure release pressure of the bottle can 2, it is possible to prevent the seal angle from becoming too small.

因みに、ここで内栓開放圧とは、開栓後にボトル缶２の口部４を飲料容器用キャップ３で再び閉止し、この状態のままボトル缶２の内圧を上昇させた後、その内圧を開放したときの圧力をいい、またシール角度とは開栓時にボトル缶２の内圧が開放される角度をいう。 By the way, here, the internal stopper opening pressure means that the opening 4 of the bottle can 2 is closed again with the cap 3 for a beverage container after the opening, and the internal pressure of the bottle can 2 is increased in this state, and then the internal pressure is increased. The pressure at the time of opening is referred to, and the seal angle is the angle at which the internal pressure of the bottle can 2 is released at the time of opening.

さらに、この実施の形態の場合、コイニング部17は、図３に示したように、キャップ本体７の厚さ方向に凹む深さ（以下、これをコイニング深さと呼ぶ）ｃを所定の寸法に選定することにより、シール部14の厚膜部24での面圧を下降させてボトル缶２の内圧開放圧を低くしつつ、後述するコイニング加工時に天板部５が変形して口部４に対するキャッピングが適正に行われなくなることを防止し得るようになされている。 Furthermore, in the case of this embodiment, as shown in FIG. 3, the coining portion 17 selects a depth c (hereinafter referred to as coining depth) c that is recessed in the thickness direction of the cap body 7 as a predetermined dimension. By doing so, the surface pressure at the thick film portion 24 of the seal portion 14 is lowered to lower the internal pressure release pressure of the bottle can 2, and the top plate portion 5 is deformed during the coining process to be described later and capping the mouth portion 4. Is prevented from being performed properly.

次に、かかる構成のキャップ付ボトル缶１の製造手順について以下説明する。この場合、先ずアルミニウム又はアルミニウム合金の圧延材をプレス成型機（図示せず）により約Φ３８ｍｍのキャップシェル（図示せず）に打抜く。これによりプレス成型機は、円板状の天板部と、この天板部の周縁から垂下した筒部とを備えたキャップシェルを成型するようになされている。 Next, a manufacturing procedure of the bottle can 1 with a cap having such a configuration will be described below. In this case, first, a rolled material of aluminum or aluminum alloy is punched into a cap shell (not shown) having a diameter of about 38 mm by a press molding machine (not shown). Thus, the press molding machine is configured to mold a cap shell including a disk-shaped top plate portion and a cylindrical portion that hangs down from the periphery of the top plate portion.

ここでプレス成型機は、キャップシェルの天板部の外表面側に配置される外側成形型と、当該キャップシェルの天板部の内表面側に配置される内側成形型とを有し、当該内側成形型に凸条に突出した凹部形成部材が設けられているとともに、当該外側成形型に凹部形成部材と対向させて平面部が設けられた構成を有する。 Here, the press molding machine has an outer mold placed on the outer surface side of the top plate portion of the cap shell, and an inner mold placed on the inner surface side of the top plate portion of the cap shell, The inner mold is provided with a recess forming member that protrudes from a ridge, and the outer mold is provided with a flat portion facing the recess forming member.

これによりプレス成形機は、圧延材をキャップシェルに打抜く際に、形成ステップとして天板部の内表面に凹部形成部材を押し当ててコイニング加工し、天板部の内表面（キャップ本体７におけるシール部対向領域16の内表面12）に凹状のコイニング部17を形成するようになされている。 As a result, when punching the rolled material into the cap shell, the press molding machine presses the concave portion forming member against the inner surface of the top plate portion as a forming step and performs coining, and the inner surface of the top plate portion (in the cap body 7) A concave coining portion 17 is formed on the inner surface 12) of the seal portion facing region 16.

またこのときプレス成形機は、外側成形型の平面部を天板部の外表面に押し当てることにより、コイニング部17に対向した外表面を凹みのない滑らかな平坦状に形成するようになされている。 At this time, the press molding machine is configured to press the flat surface of the outer mold against the outer surface of the top plate, thereby forming the outer surface facing the coining portion 17 in a smooth flat shape without dents. Yes.

次いで成形装置において、ローリング成型処理をキャップシェルに施すことによりナール40やビート41や、フレア42を備えたキャップ本体７（図３）を形成した後、このキャップ本体７をライナ成形装置に送出する。 Next, in the molding apparatus, the cap body 7 (FIG. 3) provided with the knurl 40, the beat 41, and the flare 42 is formed by subjecting the cap shell to a rolling molding process, and then the cap body 7 is sent to the liner molding apparatus. .

ライナ成形装置（図示せず）では、ライナ成形ステップとして天板部５の内表面12の中心付近に溶融させた合成樹脂材を供給した後、上方から押圧成形手段を下降させて天板部５の内表面12上で当該合成樹脂材を押し広げてゆく。 In a liner molding apparatus (not shown), a melted synthetic resin material is supplied to the vicinity of the center of the inner surface 12 of the top plate portion 5 as a liner molding step, and then the press molding means is lowered from above to top the plate portion 5. The synthetic resin material is spread and spread on the inner surface 12 of the material.

かくして、ライナ成形装置は、図３に示したように、環状に突出し、かつ厚膜部24及び薄膜部25を順次交互に有するシール部14を形成するとともに、このライナ13を天板部５の内表面12に溶着させて飲料容器用キャップ３を形成する。その後、容器内部に内容物（飲み物）を充填したボトル缶２の口部４に、図示しないキャッピング装置によって飲料容器用キャップ３を被せる。 Thus, as shown in FIG. 3, the liner molding apparatus forms a seal portion 14 that protrudes in an annular shape and alternately has thick film portions 24 and thin film portions 25, and this liner 13 is formed on the top plate portion 5. A beverage container cap 3 is formed by welding to the inner surface 12. Thereafter, a cap 3 for a beverage container is put on the mouth 4 of the bottle can 2 filled with contents (drink) inside the container by a capping device (not shown).

続いて、キャッピング装置は、キャッピング処理としてプレッシャーブロック（図示せず）によって、天板部５から缶底方向にキャップ本体７の加工領域10を押圧することで絞り加工を行い、図２に示したように、缶底方向への所定の絞り量（絞り深さ）と、キャップ本体７の径方向への所定の絞り寸法とでなる段差部11を形成し、これによりライナ13のシール部14全周をボトル缶の口部頂点4aに密着させる。 Subsequently, the capping device performs the drawing process by pressing the processing region 10 of the cap body 7 from the top plate part 5 toward the bottom of the can with a pressure block (not shown) as a capping process, as shown in FIG. In this way, a step portion 11 having a predetermined drawing amount (drawing depth) in the can bottom direction and a predetermined drawing size in the radial direction of the cap main body 7 is formed, whereby the entire seal portion 14 of the liner 13 is formed. The circumference is brought into close contact with the mouth apex 4a of the bottle can.

また、キャッピング装置は、キャッピング処理として飲料容器用キャップ３のねじ形成予定部43に対してねじ成型を行うとともに、フレア42に対して裾巻き成型を行い、図１に示すように、ボトル缶２の口部４に飲料容器用キャップ３を螺着させたキャップ付ボトル缶１を形成し得る。 In addition, the capping device performs screw molding on the thread formation scheduled portion 43 of the beverage container cap 3 as a capping process, and also performs skirt winding molding on the flare 42. As shown in FIG. A bottle can 1 with a cap in which a cap 3 for a beverage container is screwed to the mouth 4 of the bottle can be formed.

以上の構成において、飲料容器用キャップ３では、キャップ本体７の加工領域10、角部形成部９及び平坦部８の周縁部分からなり、ライナ13のシール部14に対向する環状のシール部対向領域16の内表面12に、帯状の凹んだコイニング部17を散在させて形成するようにした。 In the above-described configuration, the beverage container cap 3 includes the processing region 10 of the cap body 7, the peripheral portion of the corner portion forming portion 9 and the flat portion 8, and the annular seal portion facing region facing the seal portion 14 of the liner 13. A strip-shaped concave coining portion 17 is scattered and formed on the inner surface 12 of 16.

従って、飲料容器用キャップ３では、天板部５に絞り加工が施された後であっても、コイニング部17の分だけ口部頂点4aとの距離が確実に確保できるとともに、当該コイニング部17の分だけ天板部５の厚みを薄くできるので、天板部５がシール部14を押し付ける力を低減でき、その結果キャップ本体７と口部頂点4aとの間の面圧を確実に低下させることができる。 Therefore, in the beverage container cap 3, even after the top plate portion 5 is drawn, the distance from the mouth apex 4a can be ensured by the amount of the coining portion 17, and the coining portion 17 can be secured. Since the thickness of the top plate portion 5 can be reduced by this amount, the force with which the top plate portion 5 presses the seal portion 14 can be reduced, and as a result, the surface pressure between the cap body 7 and the mouth apex 4a is reliably reduced. be able to.

このように飲料容器用キャップ３では、コイニング部17によってキャップ本体７と口部頂点4aとの間の面圧を確実に低下できるので、その分ボトル缶２の内圧によってコイニング部17におけるシール部14が容易に変形し易くなり、ボトル缶２から外部に内圧を開放させ易くできる。 In this way, in the beverage container cap 3, the surface pressure between the cap body 7 and the mouth apex 4a can be reliably reduced by the coining portion 17, so that the seal portion 14 in the coining portion 17 is correspondingly increased by the internal pressure of the bottle can 2. Can be easily deformed and the internal pressure can be easily released from the bottle can 2 to the outside.

また、飲料容器用キャップ３では、キャップ本体７の厚み方向に凹むコイニング部17をシール部対向領域16に形成した後、溶融させた合成樹脂材を天板部５の内表面12で押し広げてライナ13を形成するようにしたことにより、当該コイニング部17の凹んだ空間内に合成樹脂材を確実に、かつ容易に押し込むことができ、かくしてシール部14の接触面22に当該コイニング部17の形状に対応した凸部23を正確に形成できる。 In the beverage container cap 3, a coining portion 17 that is recessed in the thickness direction of the cap body 7 is formed in the seal portion facing region 16, and then the melted synthetic resin material is spread on the inner surface 12 of the top plate portion 5. By forming the liner 13, the synthetic resin material can be reliably and easily pushed into the recessed space of the coining portion 17, and thus the contact surface 22 of the seal portion 14 has the contact portion 22 of the coining portion 17. The convex portion 23 corresponding to the shape can be accurately formed.

さらに、飲料容器用キャップ３では、シール部14において周辺よりも厚みが厚い厚膜部24を形成しつつも、絞り加工が施される前、シール部14全周の外表面26を従来と同じほぼ平坦に形成できるので、絞り加工を施してもシール部14全体をボトル缶２の口部頂点4aに確実に密着させることができる。 Furthermore, in the beverage container cap 3, the outer surface 26 of the entire circumference of the seal portion 14 is the same as the conventional one before the drawing process is performed while the thick portion 24 is formed thicker than the periphery in the seal portion 14. Since it can be formed almost flat, the entire seal portion 14 can be reliably brought into close contact with the mouth apex 4a of the bottle can 2 even after drawing.

そして、飲料容器用キャップ３では、環状のシール部対向領域16全周に亘って同一形状のコイニング部17を等間隔に形成するようにしたことにより、シール部対向領域16全周においてボトル缶外の内圧を均等に開放させることができる。 In the beverage container cap 3, the coining portions 17 having the same shape are formed at equal intervals over the entire circumference of the annular seal portion facing region 16, so that the bottle can The internal pressure can be released evenly.

また、この飲料容器用キャップ３では、全コイニング部17の表面積を足した全凹部分面積を、キャッピング時にボトル缶２の口部４とシールを形成する部分（以下、これをシール形成部分と呼ぶ）の表面積で徐した面積比率（以下、これをコイニング面積比率と呼ぶ）と、コイニング深さｃをシール部対向領域16での板厚で徐した比率（以下、これをコイニング深さ比率と呼ぶ）とが所定の値に選定されていることにより、内圧開放圧を低くしつつ、シール角度が小さくなり過ぎることを防止し、かつコイニング加工時に天板部５が変形して口部４とのキャッピングが適正に行われなくなることを防止してボトル缶２内を確実に密封できる。 Further, in this beverage container cap 3, the area of the entire concave portion obtained by adding the surface area of all the coining portions 17 is a portion that forms a seal with the mouth portion 4 of the bottle can 2 at the time of capping (hereinafter referred to as a seal forming portion). ) Area ratio gradually reduced by the surface area (hereinafter referred to as a coining area ratio) and a ratio in which the coining depth c is gradually increased by the plate thickness at the seal portion facing region 16 (hereinafter referred to as a coining depth ratio). ) Is selected as a predetermined value, the internal pressure release pressure is lowered, the seal angle is prevented from becoming too small, and the top plate portion 5 is deformed during coining to The bottle can 2 can be reliably sealed by preventing capping from being performed properly.

そして、この実施の形態の場合、飲料容器用キャップ３を製造する場合には、シール部対向領域16の内表面12にコイニング部17を形成する際、シール部対向領域16の内表面12側に対してのみコイニング加工を行えばよいことから、シール部対向領域16全体を波状に凹凸加工する場合に比べて加工し易くできる。因みに、飲料容器用キャップ３では、コイニング部17によりシール部対向領域16の断面形状が複雑になり、その分曲げやねじりに対して高い剛性を有し、落下強度を向上させることができる。 In the case of this embodiment, when the beverage container cap 3 is manufactured, the coining portion 17 is formed on the inner surface 12 side of the seal portion facing region 16 when the coining portion 17 is formed on the inner surface 12 of the seal portion facing region 16. Since it is only necessary to perform coining on the seal portion facing region 16, the entire seal portion facing region 16 can be processed more easily than when the corrugations are processed in a wavy shape. Incidentally, in the beverage container cap 3, the cross-sectional shape of the seal portion facing region 16 is complicated by the coining portion 17, and accordingly, it has high rigidity against bending and twisting, and can improve the drop strength.

以上の構成によれば、シール部14に対応させて天板部５の内表面12に凹んだコイニング部17を形成したことにより、天板部５に絞り加工が施された後であっても、口部頂点4aと天板部５との距離をコイニング部17の凹んだ空間の分だけ確実に確保できるとともに、当該コイニング部17の凹んだ空間の分だけ天板部５の厚みを薄くできる。従って、飲料容器用キャップ３では、天板部５がシール部14を押し付ける力が低減するので、キャップ本体７と口部頂点4aとの間の面圧が低下し、ボトル缶２の内圧によってシール部14を変形させて当該内圧を容易に開放させることができ、かくしてボトル缶２の内圧が異常に上昇することを防止できる。 According to the above configuration, even after the top plate portion 5 has been drawn by forming the recessed coining portion 17 on the inner surface 12 of the top plate portion 5 so as to correspond to the seal portion 14. The distance between the mouth apex 4a and the top plate portion 5 can be ensured by the recessed space of the coining portion 17, and the thickness of the top plate portion 5 can be reduced by the recessed space of the coining portion 17. . Accordingly, in the beverage container cap 3, since the force with which the top plate portion 5 presses the seal portion 14 is reduced, the surface pressure between the cap body 7 and the mouth portion apex 4 a is reduced, and sealing is performed by the internal pressure of the bottle can 2. The portion 14 can be deformed to easily release the internal pressure, and thus the internal pressure of the bottle can 2 can be prevented from rising abnormally.

また、天板部５の内表面12に凹んだコイニング部17を形成し、当該コイニング部17の分だけシール部14の厚みを厚くしたことにより、シール部14が閉止時に口部頂点4aと当接して容器内部を確実に密封できるとともに、ボトル缶２の内圧によってシール部14が容易に変形し、ボトル缶外に内圧を確実に開放させることができる。 In addition, a concave coining portion 17 is formed on the inner surface 12 of the top plate portion 5, and the seal portion 14 is thickened by the amount corresponding to the coining portion 17, so that the seal portion 14 is in contact with the mouth apex 4a when closed. The inside of the container can be reliably sealed by contact, and the seal portion 14 can be easily deformed by the internal pressure of the bottle can 2, and the internal pressure can be reliably released outside the bottle can.

さらに、ボトル缶２の口部４を閉止する飲料容器用キャップ３を製造するキャップ製造方法において、形成ステップによってシール部14に対応した天板部５の内表面12にコイニング部17を形成するようにした。従って、天板部５に絞り加工が施された後であっても、コイニング部17の分だけ口部頂点4aとの距離を確保するとともに、当該コイニング部17の分だけ天板部５の厚みを薄くして、キャップ本体７と口部頂点4aとの間の面圧を確実に低下させ、ボトル缶２に内圧を容易に開放し得る飲料容器用キャップ３を製造できる。 Furthermore, in the cap manufacturing method for manufacturing the beverage container cap 3 for closing the mouth portion 4 of the bottle can 2, the coining portion 17 is formed on the inner surface 12 of the top plate portion 5 corresponding to the seal portion 14 by the forming step. I made it. Therefore, even after the top plate portion 5 is drawn, the distance from the mouth apex 4a is secured by the amount of the coining portion 17, and the thickness of the top plate portion 5 is increased by the amount of the coining portion 17. It is possible to manufacture the beverage container cap 3 that can reduce the surface pressure between the cap body 7 and the mouth apex 4a with certainty, and can easily release the internal pressure to the bottle can 2.

さらに、飲料容器用キャップ３を製造するキャップ製造方法において、ライナ成形ステップによって天板部５の内表面12において溶融させた合成樹脂材押し広げてゆき、ライナを成形するようにしたことにより、シール部14の接触面22にコイニング部17に対応させて凸部23を形成できる。従って、コイニング部17の分だけシール部14の厚みが厚くなり、シール部14が閉止時に口部頂点4aと当接して容器内部を確実に密封し得るとともに、ボトル缶外に内圧を確実に開放し得る飲料容器用キャップ３を製造できる。 Furthermore, in the cap manufacturing method for manufacturing the beverage container cap 3, the liner is molded to spread the synthetic resin material melted on the inner surface 12 of the top plate part 5, thereby forming the liner. A convex portion 23 can be formed on the contact surface 22 of the portion 14 so as to correspond to the coining portion 17. Accordingly, the thickness of the seal portion 14 is increased by the amount of the coining portion 17, and when the seal portion 14 is closed, the inside of the container can be securely sealed by abutting against the apex 4a of the mouth, and the internal pressure is surely released outside the bottle can. The cap 3 for drink containers which can be manufactured can be manufactured.

なお、本発明は上記した実施の形態に限定されるものではなく、本発明の特許請求の範囲に記載した事項の範囲内で種々の変形実施をすることができ、例えば、シール部対向領域16にコイニング部17を１つだけ形成したり、複数のコイニング部を不規則に形成したり、円形状等の各種形状のコイニング部を形成したり、或いはそれぞれ異なる形状のコイニング部を形成するようにしても良く、要はシール部14に対応させて天板部５の内表面12に凹んだ凹部であればこの他種々の凹部を適用するようにしても良い。 The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the matters described in the claims of the present invention. One coining part 17 is formed, a plurality of coining parts are formed irregularly, a coining part of various shapes such as a circle is formed, or coining parts having different shapes are formed. In other words, various recesses may be applied as long as the recesses are recessed in the inner surface 12 of the top plate part 5 in correspondence with the seal part 14.

また、上述した実施の形態においては、合成樹脂材を押し広げてコイニング部17の形状に合わせた凸部23を有するライナ13を設けるようにした場合について述べたが、本発明はこれに限らず、予め円盤状に成型したライナを設けるようんしても良い。 Further, in the above-described embodiment, the case where the liner 13 having the convex portion 23 matched with the shape of the coining portion 17 by expanding the synthetic resin material is described, but the present invention is not limited to this. Alternatively, a liner previously formed into a disk shape may be provided.

この場合、コイニング部17とシール部14との間に隙間が形成されることもあるが、上述した実施の形態と同様に天板部５がシール部14を押し付ける力を低減できることから、キャップ本体７と口部頂点4aとの間の面圧を確実に低下させることができる。 In this case, a gap may be formed between the coining portion 17 and the seal portion 14, but the cap body can reduce the force with which the top plate portion 5 presses the seal portion 14 as in the above-described embodiment. The surface pressure between 7 and the mouth apex 4a can be reliably reduced.

次にシール部対向領域16の内表面12にコイニング部17を形成した飲料容器用キャップ３について検証試験を行った結果について説明する。この場合、以下の表１に示す実施例１〜７では、コイニングピッチを２０ｍｍに選定し、コイニング幅ａ及びコイニング深さｃを任意に変えて異なるコイニング面積比率（すなわち、コイニング部17の全凹部分面積／シール形成部分の表面積）及びコイニング深さ比率として検証試験を行い、シール角度、内圧開放圧及びキャップ天面変形の検証結果を比較した。また、コイニング部17を有しない従来の飲料容器用キャップを比較例として用いた。 Next, the results of a verification test on the beverage container cap 3 in which the coining portion 17 is formed on the inner surface 12 of the seal portion facing region 16 will be described. In this case, in Examples 1 to 7 shown in Table 1 below, the coining pitch is selected to be 20 mm, and the coining width a and the coining depth c are arbitrarily changed, so that different coining area ratios (that is, the entire concave portion of the coining portion 17). The verification test was performed as the ratio of the partial area / the surface area of the seal forming portion) and the coining depth ratio, and the verification results of the seal angle, the internal pressure release pressure, and the cap top surface deformation were compared. Further, a conventional beverage container cap having no coining portion 17 was used as a comparative example.

ここでキャップ天面変形とは、コイニング加工時の天板部５の変形度合いを示すもので、コイニング加工時に天板部５が変形せずに口部４にキャッピングが適正に行えたときは表中「○」で示し、コイニング加工時に天板部５が僅かに変形して口部４にキャッピングが適正に行い難かったときは表中「△」で示し、コイニング加工時に天板部５が大きく変形して口部４にキャッピングが適正に行えなかったときは表中「×」で示した。 Here, the cap top surface deformation indicates the degree of deformation of the top plate part 5 at the time of coining. When the top plate part 5 is not deformed at the time of coining and is properly capped at the mouth part 4, it is displayed. When the top plate part 5 is slightly deformed during coining processing and capping is difficult to properly perform capping, it is indicated by “△” in the table, and the top plate part 5 is large during coining processing. When it was deformed and capping could not be properly performed on the mouth part 4, it was indicated by “x” in the table.

実際上、これら実施例１〜４、６及び７では、コイニング面積比率を増やしたことにより、コイニング部17においてキャップ本体７と口部頂点4aとの間の面圧が低下し、内圧開放圧が低くなることが確認できた。但し、コイニング面積比率が７０％以上の実施例４では、コイニング部17において面圧低下が大きくなるため、シール角度が小さくなくという不具合が生じた。

In practice, in Examples 1 to 4, 6 and 7, by increasing the coining area ratio, the surface pressure between the cap body 7 and the mouth apex 4a at the coining portion 17 decreases, and the internal pressure release pressure is reduced. It was confirmed that it was lowered. However, in Example 4 in which the coining area ratio was 70% or more, a decrease in the surface pressure in the coining portion 17 was large, and thus a problem that the seal angle was not small occurred.

また、コイニング深さ比率を２０％以上にすると、内圧開放圧が低くなることが分かった。但し、コイニング深さ比率が６０％以上とした実施例７では、キャップ天面変形が「×」となった。 It was also found that when the coining depth ratio was 20% or more, the internal pressure release pressure was lowered. However, in Example 7 in which the coining depth ratio was 60% or more, the cap top surface deformation was “x”.

以上より、シール角度、内圧開放圧の低減及びキャップ天面変形の観点からコイニング面積比率は１０〜７０％に選定されることが望ましく、コイニング深さ比率は２０〜４０％に選定されることが望ましいことが分かった。 From the above, it is desirable that the coining area ratio is selected to be 10 to 70% and the coining depth ratio is selected to be 20 to 40% from the viewpoint of reducing the sealing angle, internal pressure release pressure, and cap top surface deformation. I found it desirable.

本発明によるキャップ付ボトル缶の構成を示す斜視図である。It is a perspective view which shows the structure of the bottle can with a cap by this invention. ボトル缶の口部と飲料容器用キャップとの側断面構成を示す断面図である。It is sectional drawing which shows the side cross-section structure of the opening part of a bottle can and the cap for drink containers. キャッピング処理を行う前の飲料容器用キャップの側断面構成を示す断面図である。It is sectional drawing which shows the side cross-section structure of the cap for drink containers before performing a capping process. コイニング部の構成を示す下面図である。It is a bottom view which shows the structure of a coining part.

Explanation of symbols

１キャップ付ボトル缶
２ボトル缶
３飲料容器用キャップ（キャップ）
4a 口部頂点
５天板部
６筒部
７キャップ本体
12 内表面
17 コイニング部（凹部）
22 接触面
23 凸部 1 Bottle can with cap 2 Bottle can 3 Cap for beverage container (cap)
4a Mouth apex 5 Top plate 6 Tube 7 Cap body
12 Inner surface
17 Coining part (concave part)
22 Contact surface
23 Convex

Claims

A cap provided with a cap body in which a cylinder portion hangs from the periphery of the top plate portion and a liner provided on the inner surface of the top plate portion, and the liner is provided with a seal portion that comes into contact with the top of the mouth of the container In
A cap that is recessed in the thickness direction of the cap body is formed on the inner surface of the top plate portion at a position facing the seal portion.

The cap according to claim 1, wherein a convex portion is formed on the seal portion so as to correspond to the concave portion on a contact surface side with the top plate portion.

A cap provided with a cap body in which a cylinder portion hangs down from a peripheral edge of the top plate portion, and a liner provided on the inner surface of the top plate portion;
In a bottle can with a cap composed of a bottle can whose mouth is closed by the cap,
The cap is provided with a seal portion that contacts the top of the bottle can on the liner, and the inner surface of the top plate portion has a thickness direction of the cap body at a position facing the seal portion. A bottle can with a cap, characterized in that a concave portion is formed.

The bottle can with a cap according to claim 3, wherein a convex portion is formed on the seal portion so as to correspond to the concave portion on a contact surface side with the top plate portion.

A cap provided with a cap body in which a cylinder portion hangs from the periphery of the top plate portion and a liner provided on the inner surface of the top plate portion, and the liner is provided with a seal portion that comes into contact with the top of the mouth of the container In the cap manufacturing method,
The cap manufacturing method characterized by including the formation step which forms the recessed part dented in the thickness direction of the said cap main body in the position facing the said seal part in the inner surface of the said top-plate part.

6. A liner molding step of supplying a molten synthetic resin material to an inner surface of the top plate portion in which the concave portion is formed and expanding the synthetic resin material to mold the liner. Cap manufacturing method.