JP5377471B2 - Double winding structure of can - Google Patents

Double winding structure of can Download PDF

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JP5377471B2
JP5377471B2 JP2010285689A JP2010285689A JP5377471B2 JP 5377471 B2 JP5377471 B2 JP 5377471B2 JP 2010285689 A JP2010285689 A JP 2010285689A JP 2010285689 A JP2010285689 A JP 2010285689A JP 5377471 B2 JP5377471 B2 JP 5377471B2
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lid
hook
seaming
wall
folded
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JP2012101854A (en
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裕 田部
卓也 吉田
啓 菅原
誉章 田中
千春 伊東
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Kirin Brewery Co Ltd
Universal Can Corp
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Kirin Brewery Co Ltd
Universal Can Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a double rolled seaming part structure of a can having a strength which can surely ensure sealing-ability by using a thin can lid material. <P>SOLUTION: The double rolled seaming part structure of the can uses a lid material with a sheet thickness of &le;0.235 mm, and a seaming panel 25 masking a folded part of a body hook 22 from the upper end of a chuck wall 24 is continuous, and a seaming wall 28 extending downward from its outer peripheral edge is arranged, and a cover hook 31 continuous from its lower end edge enters between the body hook 22 and a trunk part 3 from the lower part. Step differences 32 and 33 in which the upper sides on the inner peripheral faces are small diameter sides are formed so that the amounts of the projections in the radial direction become 1/16-1/2 of the sheet thickness on respective upper parts of the seaming wall 28 of the can lid 23 above the upper end of the cover hook 31 and an upper part of the body hook 22 of a can trunk 21 positioned on the inner peripheral side. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

本発明は缶胴の開口端部に缶蓋の外周部を二重に巻締めてなる缶の二重巻締め部構造に関する。   The present invention relates to a double-clamping portion structure of a can obtained by double-wrapping an outer peripheral portion of a can lid at an opening end portion of a can body.

清涼飲料等が充填される缶においては、有底円筒状の缶胴の開口部に缶蓋の外周部が二重巻締めされている。このような缶の二重巻締め部は、予め、缶胴の開口端部にフランジ部を形成するとともに、缶蓋の外周部にカール部を形成しておき、缶胴のフランジ部に缶蓋のカール部を被せた状態でこれらを一体に外側にカールさせ、缶蓋のカール部を缶胴のフランジ部の外方から鉤状に折り返しながら抱き合わせるようにして巻き込んで、その巻込み部分をさらに半径方向外方から押しつぶすように押圧することにより、缶蓋のカール部内面に塗布されたコンパウンドを缶胴と缶蓋との間に圧縮状態に介在させて密封した構造とされる。   In a can filled with a soft drink or the like, the outer periphery of the can lid is double-tightened to the opening of a bottomed cylindrical can body. Such a double tightening portion of the can has a flange portion formed in advance at the opening end portion of the can body, and a curl portion is formed in the outer peripheral portion of the can lid, and the can lid is formed on the flange portion of the can body. The curled part of the can lid is curled outward together, and the curled part of the can lid is rolled up so as to be folded from the outside of the flange part of the can body in a hook shape, and the wound part is Further, by pressing from outside in the radial direction, the compound applied to the inner surface of the curl portion of the can lid is sealed between the can body and the can lid in a compressed state.

具体的には、缶胴側においては、フランジ部が折り返されてなるボディーフックが胴体部の半径方向外側に上端から下方に向けて形成されており、缶蓋側においては、缶胴の胴体部内に入り込んだチャックウォールの上端からボディーフック上端の折り返し部分を覆うシーミングパネルが連続し、そのシーミングパネルの外周縁から下方に延びるシーミングウォールがボディーフックの半径方向外側に配置され、そのシーミングウォールの下端縁から鉤状に折り返して連続するカバーフックがボディーフックと缶胴の胴体部との間に下方から入り込んだ構造とされる。   Specifically, on the can body side, a body hook formed by folding the flange portion is formed radially outward of the body portion from the upper end to the lower side, and on the can lid side, in the body portion of the can body A seaming panel that covers the folded portion of the upper end of the body hook continues from the upper end of the chuck wall that has entered, and a seaming wall that extends downward from the outer peripheral edge of the seaming panel is disposed radially outward of the body hook. A cover hook which is folded back from the lower end edge of the mining wall in a bowl shape and is continuous is inserted into the body hook and the body portion of the can body from below.

近年では、コスト低減等のため、缶蓋材を薄肉化することが求められている。このような薄肉の缶蓋材による二重巻締め部構造として、例えば特許文献１には、缶蓋のチャックウォールとシーミングパネルとの間のシーミングパネルラジアスの半径が、シーミングパネルとシーミングウォールとの間のシーミングウォールラジアスの半径よりも小さい構造としたものが開示されている。この場合、シーミングウォールラジアスの内半径は０．２ｍｍ以下、外半径と内半径との差に対する内半径の比が３／４以下であるとよいと記載されている。   In recent years, it has been required to reduce the thickness of the can lid material in order to reduce costs. For example, Patent Document 1 discloses a seam panel radius radius between a chuck wall of a can lid and a seaming panel as a double winding portion structure using such a thin can lid material. A structure having a structure smaller than the radius of the seaming wall radius between them is disclosed. In this case, it is described that the inner radius of the seaming wall radius should be 0.2 mm or less, and the ratio of the inner radius to the difference between the outer radius and the inner radius should be 3/4 or less.

このような構造とすることにより、缶蓋材を薄肉にしても、シーミングウォールラジアスの変形量が小さく、巻締め部が緩むことはない、とされている。特許文献１には、０．２５ｍｍの板厚の缶蓋による実施例が示されている。   By adopting such a structure, it is said that even if the can lid material is thin, the deformation amount of the seaming wall radius is small and the tightening portion does not loosen. Patent Document 1 shows an example using a can lid having a plate thickness of 0.25 mm.

特開２００４−３３１１３９号公報JP 2004-331139 A

缶蓋材の薄肉化の要求はますます強くなってきており、特許文献１記載の０．２５ｍｍの板厚から、さらに０．２３ｍｍ以下の板厚のものが検討されている。しかしながら、薄肉化によって缶蓋が変形しやすくなると、たとえば容器内圧の変化によって缶蓋が缶胴に対して持ち上がるなどして、密封性が低下するおそれがある。このため、二重巻締め部の変形強度をさらに高めて、密封性を確実に維持できることが要求される。   The demand for thinner can lid materials is becoming stronger, and a plate thickness of 0.23 mm or less from the 0.25 mm plate thickness described in Patent Document 1 is being studied. However, if the can lid is easily deformed due to thinning, the sealing performance may be deteriorated, for example, the can lid is lifted with respect to the can body due to a change in the internal pressure of the container. For this reason, it is requested | required that the deformation strength of a double winding part can further be raised and sealing performance can be maintained reliably.

本発明は、このような事情に鑑みてなされたもので、薄肉の缶蓋材を使用して、確実に密封性を確保し得る強度を有する缶の二重巻締め部構造を提供することを目的とする。   The present invention has been made in view of such circumstances, and provides a double-clamped portion structure of a can having a strength capable of reliably ensuring sealing performance by using a thin can lid material. Objective.

本発明の缶の二重巻締め部構造は、板厚が０．２３５ｍｍ以下の蓋材を用いて形成した缶蓋を缶胴に巻締めてなる、缶の二重巻締め部構造であって、前記缶胴には、有底円筒状の胴体部の上端から折り返されてなり前記胴体部の半径方向外側に配置されたボディーフックが設けられ、前記缶蓋には、前記缶胴の前記胴体部内に入り込んだチャックウォールと、このチャックウォールの上端から連続し前記ボディーフックの折り返し部分を覆うシーミングパネルと、このシーミングパネルの外周縁から下方に向けて伸び前記ボディーフックの半径方向外側に配置されたシーミングウォールと、このシーミングウォールの下端から折り返されてなり前記ボディーフックと前記胴体部との間に下方から入り込んで上方に向けて延びるカバーフックとが設けられ、前記カバーフックの上端よりも上方であって前記缶蓋の前記シーミングウォールの上部に、内周面の上方側が小径となる第１段差部が、半径方向の突出量が前記蓋材の前記板厚の１／１６以上１／２以下となるように形成されているとともに、この第１段差部の内周側に位置する前記缶胴の前記ボディーフックの上部に、内周面の上方側が小径となる第２段差部が、前記カバーフックの上端よりも上方で半径方向の突出量が前記蓋材の前記板厚の１／１６以上１／２以下となるように形成されている。 The double-clamping part structure of the can of the present invention is a double-clamping part structure of a can formed by winding a can lid formed using a lid material having a plate thickness of 0.235 mm or less around a can body. The can body is provided with a body hook which is folded back from the upper end of the bottomed cylindrical body portion and is arranged on the radially outer side of the body portion, and the can lid has the body of the can body A chuck wall that has entered into the part, a seaming panel that continues from the upper end of the chuck wall and covers the folded portion of the body hook, and extends downward from the outer peripheral edge of the seam panel to the outside in the radial direction of the body hook. A seaming wall disposed, and a cover hook that is folded back from the lower end of the seaming wall and enters from between the body hook and the body portion and extends upward. A first step portion which is provided above the upper end of the cover hook and above the seaming wall of the can lid, and has a small diameter on the upper side of the inner peripheral surface; Is formed so as to be not less than 1/16 and not more than 1/2 of the plate thickness, and an inner peripheral surface is formed on the upper portion of the body hook of the can body located on the inner peripheral side of the first stepped portion. The second step portion having a small diameter on the upper side is formed so that the amount of protrusion in the radial direction above the upper end of the cover hook is 1/16 or more and 1/2 or less of the plate thickness of the lid member. .

本発明の缶の二重巻締め部構造によれば、シーミングウォールおよびボディーフックの上部に各段差部を形成したことにより、缶胴の第２段差部の内面と缶蓋のカバーフック先端とが干渉して、缶胴と缶蓋との相対的な移動が抑止されるので、薄肉の蓋材が用いられ、たとえば容器内圧が上昇した場合であっても、巻締め部における良好な密封性が維持される。なお、ここでいう「内周面」および「外周面」とは、缶軸を基準とした内周面および外周面を指す。   According to the double tightening portion structure of the can of the present invention, each step portion is formed on the top of the seaming wall and the body hook, so that the inner surface of the second step portion of the can body and the tip of the cover hook of the can lid Interferes with each other and the relative movement between the can body and the can lid is suppressed, so that a thin lid material is used. For example, even when the internal pressure of the container rises, good sealing performance at the tightening portion Is maintained. Here, the “inner peripheral surface” and “outer peripheral surface” refer to an inner peripheral surface and an outer peripheral surface based on the can shaft.

また、本発明の二重巻締め部構造は、板厚が０．２３５ｍｍ以下の蓋材を用いて形成した缶蓋を缶胴に巻締めてなる、缶の二重巻締め部構造であって、前記缶胴には、有底円筒状の胴体部の上端から折り返されてなり前記胴体部の半径方向外側に配置されたボディーフックが設けられ、前記缶蓋には、前記缶胴の前記胴体部内に入り込んだチャックウォールと、このチャックウォールの上端から連続し前記ボディーフックの折り返し部分を覆うシーミングパネルと、このシーミングパネルの外周縁から下方に向けて伸び前記ボディーフックの半径方向外側に配置されたシーミングウォールと、このシーミングウォールの下端から折り返されてなり前記ボディーフックと前記胴体部との間に下方から入り込んで上方に向けて延びるカバーフックとが設けられ、前記缶蓋の前記シーミングウォールの下部であって前記缶胴の前記ボディーフックの下端よりも下方に、前記シーミングウォールの内周面の下方側が小径となる下部段差部が、半径方向の突出量が前記蓋材の前記板厚の１／１６以上１／２以下となるように形成されていることが好ましい。この場合、缶蓋の下部段差部の内面と缶胴のボディーフック先端との干渉により、缶胴と缶蓋との相対的な移動がより効果的に抑止される。   Moreover, the double winding part structure of this invention is a double winding part structure of a can formed by winding a can lid formed using a lid material having a plate thickness of 0.235 mm or less around a can body. The can body is provided with a body hook which is folded back from the upper end of the bottomed cylindrical body portion and is arranged on the radially outer side of the body portion, and the can lid has the body of the can body A chuck wall that has entered into the part, a seaming panel that continues from the upper end of the chuck wall and covers the folded portion of the body hook, and extends downward from the outer peripheral edge of the seam panel to the outside in the radial direction of the body hook. The arranged seaming wall, and a cover hook that is folded back from the lower end of the seaming wall and enters the space between the body hook and the body portion from below and extends upward. A lower step portion having a small diameter on the lower side of the inner peripheral surface of the seaming wall, below the lower end of the body hook of the can body, and below the seaming wall of the can lid, It is preferable that the protruding amount in the radial direction is 1/16 or more and 1/2 or less of the plate thickness of the lid member. In this case, the relative movement between the can body and the can lid is more effectively suppressed by the interference between the inner surface of the lower step portion of the can lid and the body hook tip of the can body.

また、本発明の二重巻締め部構造は、板厚が０．２３５ｍｍ以下の蓋材を用いて形成した缶蓋を缶胴に巻締めてなる、缶の二重巻締め部構造であって、前記缶胴には、有底円筒状の胴体部の上端から折り返されてなり前記胴体部の半径方向外側に配置されたボディーフックが設けられ、前記缶蓋には、前記缶胴の前記胴体部内に入り込んだチャックウォールと、このチャックウォールの上端から連続し前記ボディーフックの折り返し部分を覆うシーミングパネルと、このシーミングパネルの外周縁から下方に向けて伸び前記ボディーフックの半径方向外側に配置されたシーミングウォールと、このシーミングウォールの下端から折り返されてなり前記ボディーフックと前記胴体部との間に下方から入り込んで上方に向けて延びるカバーフックとが設けられ、前記カバーフックの上端よりも上方であって前記缶蓋の前記チャックウォールの上部に、外周面の上方側が大径となる缶蓋側段差部が、半径方向の突出量が前記蓋材の前記板厚の１／１６以上１／２以下となるように形成されているとともに、この缶蓋側段差部の外周側に位置する前記缶胴の前記胴体部の上部に、外周面の上方側が大径となる缶胴側段差部が、前記カバーフックの上端よりも上方で半径方向の突出量が前記蓋材の前記板厚の１／１６以上１／２以下となるように形成されていることが好ましい。この場合、缶胴の胴体部の上部に形成された缶胴側段差部と缶蓋のカバーフック先端との干渉により、缶胴と缶蓋との相対的な移動がより効果的に抑止される。 Moreover, the double winding part structure of this invention is a double winding part structure of a can formed by winding a can lid formed using a lid material having a plate thickness of 0.235 mm or less around a can body. The can body is provided with a body hook which is folded back from the upper end of the bottomed cylindrical body portion and is arranged on the radially outer side of the body portion, and the can lid has the body of the can body A chuck wall that has entered into the part, a seaming panel that continues from the upper end of the chuck wall and covers the folded portion of the body hook, and extends downward from the outer peripheral edge of the seam panel to the outside in the radial direction of the body hook. The arranged seaming wall, and a cover hook that is folded back from the lower end of the seaming wall and enters the space between the body hook and the body portion from below and extends upward. A can lid side step portion having a large diameter on the upper side of the outer peripheral surface above the chuck wall of the can lid and above the upper end of the cover hook; It is formed so as to be 1/16 or more and 1/2 or less of the plate thickness of the material, and on the upper part of the body part of the can body located on the outer peripheral side of the can lid side step part, The can barrel side step portion having a large diameter on the upper side is formed so that the protruding amount in the radial direction is 1/16 or more and 1/2 or less of the plate thickness of the lid material above the upper end of the cover hook. It is preferable. In this case, the relative movement between the can body and the can lid is more effectively suppressed due to the interference between the can body side step formed on the upper portion of the body portion of the can body and the tip of the cover hook of the can lid. .

本発明の缶の二重巻締め部構造によれば、板厚が０．２３５ｍｍ以下の薄肉の蓋材を使用し、落下衝撃等に対して十分な強度を有して、確実に密封性を確保することができる。   According to the double winding part structure of the can of the present invention, a thin cover material having a plate thickness of 0.235 mm or less is used, and it has sufficient strength against a drop impact or the like, and has a reliable sealing property. Can be secured.

本発明に係る缶の二重巻締め部の一実施形態の構造を示す拡大縦断面図である。It is an expanded longitudinal cross-sectional view which shows the structure of one Embodiment of the double winding part of the can which concerns on this invention. 図１の二重巻締め部を構成する缶胴と缶蓋との巻締め工程における（ａ）巻締め前、（ｂ）１回目の巻締め後を示す縦断面図である。It is a longitudinal cross-sectional view which shows (a) before winding fastening in the winding process of the can body and can lid which comprise the double winding fastening part of FIG. 1, and (b) after the 1st winding. 図１の二重巻締め部を構成する缶胴と缶蓋との巻締め工程における２回目の巻締め後を示す縦断面図である。It is a longitudinal cross-sectional view which shows after the 2nd winding in the winding process of the can body and can lid which comprise the double winding part of FIG. 本発明に係る缶の二重巻締め部の他の実施形態の構造を示す拡大断面図である。It is an expanded sectional view which shows the structure of other embodiment of the double winding part of the can which concerns on this invention. 本発明に係る缶の二重巻締め部の他の実施形態の構造を示す拡大断面図である。It is an expanded sectional view which shows the structure of other embodiment of the double winding part of the can which concerns on this invention. 本発明に係る缶の二重巻締め部のさらに別の実施形態の構造を示す拡大断面図である。It is an expanded sectional view which shows the structure of another embodiment of the double winding part of the can which concerns on this invention. 本発明に係る缶の二重巻締め部のさらに別の実施形態の構造を示す拡大断面図である。It is an expanded sectional view which shows the structure of another embodiment of the double winding part of the can which concerns on this invention.

以下、本発明に係る缶の二重巻締め部構造の一実施形態について、図面を参照して説明する。本実施形態の二重巻締め部構造は、図１に示すように、缶胴の開口端部に缶蓋の周縁部が抱き合わせられるように巻き込まれている。   Hereinafter, an embodiment of a double tightening portion structure of a can according to the present invention will be described with reference to the drawings. As shown in FIG. 1, the double tightening portion structure of the present embodiment is wound so that the peripheral edge of the can lid is entangled with the open end of the can body.

図２（ａ）に、二重巻締めされる前の缶胴１と缶蓋２とを示す。巻締め前の缶胴１は、元板厚が０．２３０ｍｍ〜０．３４０ｍｍのアルミニウム合金製板材を広口のカップ状に打ち抜いた後、さらに絞りしごき加工（ＤＩ加工）することにより形成したストレートの有底円筒状の胴体部３の開口端部を若干縮径した上で拡径して、胴体部３の上端から半径方向外方に広がるフランジ部４が形成された形状である。   FIG. 2A shows the can body 1 and the can lid 2 before being double-tightened. The can body 1 before being rolled is a straight body formed by punching an aluminum alloy plate material having a base plate thickness of 0.230 mm to 0.340 mm into a wide-mouthed cup shape and then drawing and ironing (DI processing). The opening end of the bottomed cylindrical body 3 is slightly reduced in diameter and then expanded to form a flange 4 that extends radially outward from the upper end of the body 3.

一方、巻締め前の缶蓋２は、元板厚が０．２３５ｍｍ以下、たとえば０．２００ｍｍ〜０．２３５ｍｍのアルミニウム合金製蓋材をプレス成形することにより、缶胴１の胴体部３より小径の円形のパネル部５が中心部に形成されるとともに、パネル部５の外縁に環状溝を形成するカウンターシンク部６を介して、チャックウォール７が上方に延びて形成されている。このチャックウォール７の上端から半径方向外方に延びながら外周縁が外側にカールされたカール部８が形成されている。カール部８の内面には、コンパウンド９が塗布されている。   On the other hand, the can lid 2 before winding is smaller in diameter than the body portion 3 of the can body 1 by press-molding an aluminum alloy lid material having a base plate thickness of 0.235 mm or less, for example, 0.200 mm to 0.235 mm. A circular panel portion 5 is formed at the center portion, and a chuck wall 7 is formed to extend upward through a counter sink portion 6 that forms an annular groove on the outer edge of the panel portion 5. A curled portion 8 having an outer peripheral edge curled outward while extending radially outward from the upper end of the chuck wall 7 is formed. A compound 9 is applied to the inner surface of the curled portion 8.

巻締めは、次のように行われる。まず、図２（ａ）に示すように、リフター（図示略）に載せた缶胴１のフランジ部４に缶蓋２のカール部８を被せ、その上方からチャック１１を缶蓋２に嵌合して、チャック１１とリフターとの間で缶胴１と缶蓋２とを挟んだ状態で、これらの半径方向外方から第１シーミングロール１２Ａを接近させ、缶蓋２のカール部８と缶胴１のフランジ部４とを外側に一体にカールさせ、缶蓋２のカール部８を缶胴１のフランジ部４の外方から鉤状に折り返しながら抱き合わせるようにして巻き込む。   The winding is performed as follows. First, as shown in FIG. 2A, the flange portion 4 of the can body 1 placed on a lifter (not shown) is covered with the curled portion 8 of the can lid 2, and the chuck 11 is fitted to the can lid 2 from above. Then, in a state where the can body 1 and the can lid 2 are sandwiched between the chuck 11 and the lifter, the first seaming roll 12A is approached from the outside in the radial direction, and the curled portion 8 of the can lid 2 is The flange portion 4 of the can body 1 is integrally curled to the outside, and the curled portion 8 of the can lid 2 is wound around the outside of the flange portion 4 of the can body 1 so as to be entangled and folded.

次いで、図２（ｂ）に示すように、第２シーミングロール１２Ｂにより、その巻き込み部分をさらに半径方向外方から押しつぶすように押圧する。これにより、図３に示すように、コンパウンド９を缶胴１と缶蓋２との間に圧縮状態に介在させた二重巻締め部１３が構成される。なお、第２シーミングロール１２Ｂは、図２（ｂ）に示すように半径方向内方に向けて突出する段差部１２ｃを上部に有している。この第２シーミングロール１２Ｂの段差部１２ｃによって、二重巻締め部１３の上部に段差形状が形成される。   Next, as shown in FIG. 2B, the second seaming roll 12B is pressed so as to further crush the entrained portion from the outside in the radial direction. Thereby, as shown in FIG. 3, the double winding fastening part 13 which comprised the compound 9 in the compression state between the can body 1 and the can lid 2 is comprised. In addition, the 2nd seaming roll 12B has the level | step-difference part 12c which protrudes toward radial inside as shown in FIG.2 (b) in the upper part. A step shape is formed on the upper portion of the double tightening portion 13 by the step portion 12c of the second seaming roll 12B.

この二重巻締め部１３を図１に拡大して示す。缶胴２１は、フランジ部４が巻締めによって押しつぶされることにより、胴体部３の上端から半径方向外方に折り返されてなるボディーフック２２が胴体部３の半径方向外側にほぼ缶軸方向に沿って配置されている。   This double winding tightening part 13 is expanded and shown in FIG. In the can body 21, the flange portion 4 is crushed by tightening, so that a body hook 22 that is folded back outward in the radial direction from the upper end of the body portion 3 extends substantially radially outward of the body portion 3 along the can axis direction. Are arranged.

缶蓋２３は、パネル部５からチャックウォール２４までの部分が胴体部３の内側に入り込んでいる。カール部８が巻締めによって成形されることにより、チャックウォール２４の上端から連続しボディーフック２２の折り返し部分を覆うシーミングパネル２５と、このシーミングパネル２５の外周縁から下方に向けて延びボディーフック２２の半径方向外側に配置されたシーミングウォール２８と、このシーミングウォール２８の下端から折り返されボディーフック２２と缶胴２１の胴体部３との間に下方から入り込んで上方に向けて延びるカバーフック３１とが設けられている。   In the can lid 23, a portion from the panel unit 5 to the chuck wall 24 enters the inside of the body unit 3. By forming the curled portion 8 by tightening, a seaming panel 25 that continues from the upper end of the chuck wall 24 and covers the folded portion of the body hook 22, and a body that extends downward from the outer peripheral edge of the seaming panel 25. A seaming wall 28 disposed on the radially outer side of the hook 22, and is folded back from the lower end of the seaming wall 28 to enter between the body hook 22 and the body part 3 of the can body 21 from below and extend upward. A cover hook 31 is provided.

缶蓋２３には、カバーフック３１の上端よりも上方であってシーミングウォール２８の上部に、内周面の上方側が小径となる第１段差部３２が、半径方向の突出量Ｈ１が蓋材の板厚の１／１６以上１／２以下となるように形成されている。また缶胴２１には、この第１段差部３２の内側であってボディーフック２２の上部に、内周面の上方側が小径となる第２段差部３３が、半径方向の突出量Ｈ２が蓋材の板材の板厚の１／１６以上１／２以下となるように形成されている。なお、ここでいう「内周面」および「外周面」とは、缶軸を基準とした内周面および外周面を指す。   The can lid 23 has a first step portion 32 having a small diameter on the upper side of the inner peripheral surface above the seaming wall 28 above the upper end of the cover hook 31, and a protruding amount H1 in the radial direction is a lid material. It is formed to be 1/16 or more and 1/2 or less of the plate thickness. Further, the can body 21 has a second step portion 33 having a small diameter on the upper side of the inner peripheral surface inside the first step portion 32 and above the body hook 22, and a protruding amount H2 in the radial direction is a lid material. It is formed so as to be 1/16 or more and 1/2 or less of the thickness of the plate material. Here, the “inner peripheral surface” and “outer peripheral surface” refer to an inner peripheral surface and an outer peripheral surface based on the can shaft.

この二重巻締め部１３の内部に、缶蓋２３の内面に塗布されていたコンパウンド９が缶胴２１との間で圧縮状態に介在させられることにより、缶胴２１と缶蓋２３との間が密封状態となっている。   The compound 9 applied to the inner surface of the can lid 23 is interposed between the can body 21 and the can lid 23 inside the double winding portion 13 in a compressed state. Is in a sealed state.

容器内圧が上昇した場合、缶胴２１に対して缶蓋２３が上方（図１に矢印で示す方向に）へ押し上げられてしまうと、缶蓋２３のシーミングパネル２５と缶胴２１の折り返し部分との間に隙間が生じ、密封性が損なわれるおそれがある。これに対して、このような二重巻締め部構造によれば、板厚が０．２３５ｍｍ以下と薄く変形しやすい蓋材を使用しても、缶蓋２３のカバーフック３１の先端と缶胴２１に形成された第２段差部３３の内面とが干渉するため、缶蓋２３が缶胴２１に対して押し上げられにくいので、缶胴２１と缶蓋２３との間に隙間が生じにくく、良好な密閉性を維持することができる。   When the internal pressure of the container rises, if the can lid 23 is pushed upward (in the direction indicated by the arrow in FIG. 1) with respect to the can body 21, the seaming panel 25 of the can lid 23 and the folded portion of the can body 21 There is a possibility that a gap is formed between the two and the sealing performance is impaired. On the other hand, according to such a double tightening portion structure, the tip of the cover hook 31 of the can lid 23 and the can body can be formed even if a thin lid member having a thickness of 0.235 mm or less is used. Since the inner surface of the second stepped portion 33 formed on the 21 interferes, the can lid 23 is difficult to be pushed up with respect to the can body 21, and a gap is not easily generated between the can body 21 and the can lid 23, which is good. High sealing performance can be maintained.

図４に、本発明の第２の実施形態に係る缶の二重巻締め部構造を示す。本実施形態では、シーミングウォール２８の下部であって缶胴２１のボディーフック２２の下端よりも下方に、シーミングウォール２８の内周面の下方側が小径となる下部段差部３４が、半径方向の突出量Ｈ３が蓋材の板厚の１／１６以上１／２以下となるように形成されている。したがって、下部段差部３４に缶胴２１のボディーフック２２の先端が係止されることにより、缶蓋２３の持ち上がりが防止される。この下部段差部３４は、第２シーミングロール１２Ｂの下部に突出する段差部１２ｄを形成しておくことにより、第１段差部３２と同様に形成することができる。   In FIG. 4, the double winding part structure of the can which concerns on the 2nd Embodiment of this invention is shown. In the present embodiment, a lower step portion 34 having a small diameter on the lower side of the inner peripheral surface of the seaming wall 28 is provided in the radial direction below the seaming wall 28 and below the lower end of the body hook 22 of the can body 21. The protrusion amount H3 is formed to be 1/16 or more and 1/2 or less of the plate thickness of the lid member. Therefore, when the tip of the body hook 22 of the can body 21 is locked to the lower step portion 34, the can lid 23 is prevented from being lifted. The lower stepped portion 34 can be formed in the same manner as the first stepped portion 32 by forming a stepped portion 12d that protrudes below the second seaming roll 12B.

また、図５に示すように、上述の第１段差部３２および第２段差部３３とともに、下部段差部３４が形成されていてもよい。この場合、第１段差部３２，第２段差部３３にカバーフック３１の先端が係止されるとともに、下部段差部３４に缶胴２１のボディーフック２２の先端が係止されることにより、缶蓋２３の持ち上がりがより効果的に防止される。   As shown in FIG. 5, a lower stepped portion 34 may be formed together with the first stepped portion 32 and the second stepped portion 33 described above. In this case, the tip of the cover hook 31 is locked to the first step portion 32 and the second step portion 33, and the tip of the body hook 22 of the can body 21 is locked to the lower step portion 34. Lifting of the lid 23 is more effectively prevented.

図６に、本発明の第３の実施形態に係る缶の二重巻締め部構造を示す。本実施形態では、缶胴２１の胴体部３に、カバーフック３１の上端よりも上方に、外周面の上方側が大径となる缶胴側段差部３５が、半径方向の突出量Ｈ４が蓋材の板厚の１／１６以上１／２以下となるように形成されている。また、缶蓋２３のチャックウォール２４においても、缶胴２１の缶胴側段差部３５の内周側に、外周面の上方側が大径となる缶蓋側段差部３６が、半径方向の突出量Ｈ５が蓋材の板厚の１／１６以上１／２以下となるように形成されている。缶胴側段差部３５，缶蓋側段差部３６に缶蓋２３のカバーフック３１の先端が係止されることにより、缶蓋２３の持ち上がりがさらに効果的に防止される。これら缶胴側段差部３５，缶蓋側段差部３６は、チャック１１に段差を形成しておくことにより形成することができる。   In FIG. 6, the double winding part structure of the can which concerns on the 3rd Embodiment of this invention is shown. In the present embodiment, the body portion 3 of the can body 21 has a can body side step portion 35 having a large diameter on the upper side of the outer peripheral surface above the upper end of the cover hook 31, and a protrusion amount H 4 in the radial direction is a lid material. It is formed to be 1/16 or more and 1/2 or less of the plate thickness. In the chuck wall 24 of the can lid 23, the can lid side stepped portion 36 having a large diameter on the upper side of the outer peripheral surface is provided on the inner peripheral side of the can barrel side stepped portion 35 of the can barrel 21. H5 is formed to be 1/16 or more and 1/2 or less of the plate thickness of the lid. When the tip of the cover hook 31 of the can lid 23 is locked to the can body side step portion 35 and the can lid side step portion 36, the can lid 23 can be prevented from being lifted more effectively. The can body side stepped portion 35 and the can lid side stepped portion 36 can be formed by forming a step on the chuck 11.

また、図７に示すように、第１段差部３２および第２段差部３３とともに、缶胴側段差部３５および缶蓋側段差部３６、さらに下部段差部３４が形成されていてもよい。この場合、これらの段差部３３〜３６が形成されていることにより、缶蓋２３のカバーフック３１の先端が内外周の両側から押さえられ、缶蓋２３の持ち上がりがより効果的に防止される。また、缶胴２１のボディーフック２２の先端によっても、缶蓋２３の持ち上がりが防止される。   Further, as shown in FIG. 7, a can body side step portion 35, a can lid side step portion 36, and a lower step portion 34 may be formed together with the first step portion 32 and the second step portion 33. In this case, since the step portions 33 to 36 are formed, the tip of the cover hook 31 of the can lid 23 is pressed from both the inner and outer peripheral sides, and the can lid 23 is prevented from being lifted more effectively. Further, the lift of the can lid 23 is also prevented by the tip of the body hook 22 of the can body 21.

以上説明したように、本発明の缶の二重巻締め部構造によれば、巻締め工程で形成される段差形状が缶蓋と缶胴とを係止させ、これらの相対移動を防止するので、容器内圧が上昇した場合などであっても、缶胴と缶蓋との間における高い密封性を維持することができる。
なお、本発明は前記実施形態の構成のものに限定されるものではなく、細部構成においては、本発明の趣旨を逸脱しない範囲において種々の変更を加えることが可能である。 As described above, according to the double winding part structure of the can of the present invention, the step shape formed in the winding process locks the can lid and the can body, and prevents their relative movement. Even when the internal pressure of the container is increased, high sealing performance between the can body and the can lid can be maintained.
In addition, this invention is not limited to the thing of the structure of the said embodiment, In a detailed structure, it is possible to add a various change in the range which does not deviate from the meaning of this invention.

１，２１ 缶胴
２ （巻締め前の）缶蓋
３ 胴体部
４ フランジ部
５ パネル部
６ カウンターシンク部
７ チャックウォール
８ カール部
９ コンパウンド
１１ チャック
１２Ａ 第１シーミングロール
１２Ｂ 第２シーミングロール
１２ｃ 段差部
１３ 二重巻締め部
２２ ボディーフック
２３ （巻締め後の）缶蓋
２４ チャックウォール
２５ シーミングパネル
２８ シーミングウォール
３１ カバーフック
３２ 第１段差部
３３ 第２段差部
３４ 下部段差部
３５ 缶胴側段差部
３６ 缶蓋側段差部 1, 21 Can body 2 (before tightening) Can lid 3 Body portion 4 Flange portion 5 Panel portion 6 Counter sink portion 7 Chuck wall 8 Curl portion 9 Compound 11 Chuck 12A First seaming roll 12B Second seaming roll 12c Step portion 13 Double winding portion 22 Body hook 23 Can lid 24 (after winding) Chuck wall 25 Seaming panel 28 Seaming wall 31 Cover hook 32 First step portion 33 Second step portion 34 Lower step portion 35 Can Body side step part 36 Can lid side step part

Claims (3)

板厚が０．２３５ｍｍ以下の蓋材を用いて形成した缶蓋を缶胴に巻締めてなる、缶の二重巻締め部構造であって、
前記缶胴には、有底円筒状の胴体部の上端から折り返されてなり前記胴体部の半径方向外側に配置されたボディーフックが設けられ、
前記缶蓋には、前記缶胴の前記胴体部内に入り込んだチャックウォールと、このチャックウォールの上端から連続し前記ボディーフックの折り返し部分を覆うシーミングパネルと、このシーミングパネルの外周縁から下方に向けて伸び前記ボディーフックの半径方向外側に配置されたシーミングウォールと、このシーミングウォールの下端から折り返されてなり前記ボディーフックと前記胴体部との間に下方から入り込んで上方に向けて延びるカバーフックとが設けられ、
前記カバーフックの上端よりも上方であって前記缶蓋の前記シーミングウォールの上部に、内周面の上方側が小径となる第１段差部が、半径方向の突出量が前記蓋材の前記板厚の１／１６以上１／２以下となるように形成されているとともに、この第１段差部の内周側に位置する前記缶胴の前記ボディーフックの上部に、内周面の上方側が小径となる第２段差部が、前記カバーフックの上端よりも上方で半径方向の突出量が前記蓋材の前記板厚の１／１６以上１／２以下となるように形成されていることを特徴とする缶の二重巻締め部構造。 The can is a double-clamping portion structure of a can formed by winding a can lid formed using a lid material having a thickness of 0.235 mm or less around a can body,
The can body is provided with a body hook that is folded from the upper end of the bottomed cylindrical body portion and is arranged on the radially outer side of the body portion,
The can lid includes a chuck wall that has entered the body portion of the can body, a seaming panel that is continuous from an upper end of the chuck wall and covers a folded portion of the body hook, and a lower portion from the outer peripheral edge of the seaming panel. A seaming wall disposed radially outward of the body hook, and folded from the lower end of the seaming wall, and enters from between the body hook and the body portion from below to face upward. An extending cover hook is provided,
A first step portion having a small diameter on the upper side of the inner peripheral surface is located above the upper end of the cover hook and above the seaming wall of the can lid, and the protruding amount in the radial direction is the plate of the lid member. It is formed to be 1/16 or more and 1/2 or less of the thickness, and the upper side of the inner peripheral surface has a small diameter on the upper part of the body hook of the can body located on the inner peripheral side of the first stepped portion. The second step portion is formed so that the amount of protrusion in the radial direction above the upper end of the cover hook is 1/16 or more and 1/2 or less of the plate thickness of the lid member. The double winding part structure of the can. 板厚が０．２３５ｍｍ以下の蓋材を用いて形成した缶蓋を缶胴に巻締めてなる、缶の二重巻締め部構造であって、
前記缶胴には、有底円筒状の胴体部の上端から折り返されてなり前記胴体部の半径方向外側に配置されたボディーフックが設けられ、
前記缶蓋には、前記缶胴の前記胴体部内に入り込んだチャックウォールと、このチャックウォールの上端から連続し前記ボディーフックの折り返し部分を覆うシーミングパネルと、このシーミングパネルの外周縁から下方に向けて伸び前記ボディーフックの半径方向外側に配置されたシーミングウォールと、このシーミングウォールの下端から折り返されてなり前記ボディーフックと前記胴体部との間に下方から入り込んで上方に向けて延びるカバーフックとが設けられ、
前記缶蓋の前記シーミングウォールの下部であって前記缶胴の前記ボディーフックの下端よりも下方に、前記シーミングウォールの内周面の下方側が小径となる下部段差部が、半径方向の突出量が前記蓋材の前記板厚の１／１６以上１／２以下となるように形成されていることを特徴とする缶の二重巻締め部構造。 The can is a double-clamping portion structure of a can formed by winding a can lid formed using a lid material having a thickness of 0.235 mm or less around a can body,
The can body is provided with a body hook that is folded from the upper end of the bottomed cylindrical body portion and is arranged on the radially outer side of the body portion,
The can lid includes a chuck wall that has entered the body portion of the can body, a seaming panel that is continuous from an upper end of the chuck wall and covers a folded portion of the body hook, and a lower portion from the outer peripheral edge of the seaming panel. A seaming wall disposed radially outward of the body hook, and folded from the lower end of the seaming wall, and enters from between the body hook and the body portion from below to face upward. An extending cover hook is provided,
A lower stepped portion having a small diameter on the lower side of the inner peripheral surface of the seaming wall is located below the bottom end of the seaming wall of the can lid and below the lower end of the body hook of the can body. A double tightening portion structure of a can, wherein the structure is formed so that the amount is 1/16 or more and 1/2 or less of the plate thickness of the lid. 板厚が０．２３５ｍｍ以下の蓋材を用いて形成した缶蓋を缶胴に巻締めてなる、缶の二重巻締め部構造であって、
前記缶胴には、有底円筒状の胴体部の上端から折り返されてなり前記胴体部の半径方向外側に配置されたボディーフックが設けられ、
前記缶蓋には、前記缶胴の前記胴体部内に入り込んだチャックウォールと、このチャックウォールの上端から連続し前記ボディーフックの折り返し部分を覆うシーミングパネルと、このシーミングパネルの外周縁から下方に向けて伸び前記ボディーフックの半径方向外側に配置されたシーミングウォールと、このシーミングウォールの下端から折り返されてなり前記ボディーフックと前記胴体部との間に下方から入り込んで上方に向けて延びるカバーフックとが設けられ、
前記カバーフックの上端よりも上方であって前記缶蓋の前記チャックウォールの上部に、外周面の上方側が大径となる缶蓋側段差部が、半径方向の突出量が前記蓋材の前記板厚の１／１６以上１／２以下となるように形成されているとともに、この缶蓋側段差部の外周側に位置する前記缶胴の前記胴体部の上部に、外周面の上方側が大径となる缶胴側段差部が、前記カバーフックの上端よりも上方で半径方向の突出量が前記蓋材の前記板厚の１／１６以上１／２以下となるように形成されていることを特徴とする缶の二重巻締め部構造。 The can is a double-clamping portion structure of a can formed by winding a can lid formed using a lid material having a thickness of 0.235 mm or less around a can body,
The can body is provided with a body hook that is folded from the upper end of the bottomed cylindrical body portion and is arranged on the radially outer side of the body portion,
The can lid includes a chuck wall that has entered the body portion of the can body, a seaming panel that is continuous from the upper end of the chuck wall and covers the folded portion of the body hook, and a lower portion from the outer peripheral edge of the seaming panel. A seaming wall disposed radially outward of the body hook, and folded from the lower end of the seaming wall, and enters from between the body hook and the body portion from below to face upward. An extending cover hook is provided,
A can lid side step portion having a large diameter on the upper side of the outer peripheral surface is located above the upper end of the cover hook and above the chuck wall of the can lid, and the protruding amount in the radial direction is the plate of the lid material. It is formed to be 1/16 or more and 1/2 or less of the thickness, and the upper side of the outer peripheral surface has a large diameter on the upper part of the body part of the can body located on the outer peripheral side of the step part on the can lid side. The can barrel side step portion is formed so that the protruding amount in the radial direction above the upper end of the cover hook is 1/16 or more and 1/2 or less of the plate thickness of the lid member. The double winding structure of the can.
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