JP7506027B2 - A container lid with a metal body and a synthetic resin liner - Google Patents

A container lid with a metal body and a synthetic resin liner Download PDF

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JP7506027B2
JP7506027B2 JP2021082410A JP2021082410A JP7506027B2 JP 7506027 B2 JP7506027 B2 JP 7506027B2 JP 2021082410 A JP2021082410 A JP 2021082410A JP 2021082410 A JP2021082410 A JP 2021082410A JP 7506027 B2 JP7506027 B2 JP 7506027B2
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俊平 下地
英典 近藤
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Nippon Closures Co Ltd
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本発明は、円形状の天面壁とこの天面壁の周縁から垂下する円筒形状のスカート壁とを有する金属薄板製本体及び本体の天面壁の内面に配設された合成樹脂製ライナーを備えた容器蓋に関する。 The present invention relates to a container lid equipped with a sheet metal body having a circular top wall and a cylindrical skirt wall hanging down from the periphery of the top wall, and a synthetic resin liner disposed on the inner surface of the top wall of the body.

アルミニウム基合金の如き金属薄板から形成され、円筒形状の口頸部の上端部には外巻カールが形成され、口頸部の外周面には雌螺条とその下方に位置する係止あご部が形成されている、一般にボトル缶と称されている容器に特に適する容器蓋として、下記特許文献１及び２には、円形状の天面壁とこの天面壁の周縁から垂下する円筒形状のスカート壁とを有する金属薄板製本体及び本体の天面壁内面に配設された合成樹脂製ライナーを備えた容器蓋が開示されている。本体のスカート壁の上端部には環状凹部が形成されている。ライナーは天面壁の内面に供給された硬質合成樹脂材料を型押成形することによって成形された第一層及びこの第一層の下面に供給された軟質合成樹脂材料を型押成形することによって成形された第二層とから構成されている。ライナーの第一層は、本体の天面壁の内面に沿って延在する円形状の中央部及び本体の天面壁の外周縁部及びスカート壁の上端部に沿って延在する円環形状の外周縁部を有し、ライナーの第二層は第一層の中央部に積層されている。 As a container lid particularly suitable for containers generally called bottle cans, which are formed from a metal sheet such as an aluminum-based alloy, have an outward curl at the top end of the cylindrical neck, and have a female thread and a locking jaw located below it on the outer periphery of the neck, the following Patent Documents 1 and 2 disclose a container lid equipped with a metal sheet body having a circular top wall and a cylindrical skirt wall hanging down from the periphery of the top wall, and a synthetic resin liner disposed on the inner surface of the top wall of the body. An annular recess is formed at the upper end of the skirt wall of the body. The liner is composed of a first layer formed by embossing a hard synthetic resin material supplied to the inner surface of the top wall, and a second layer formed by embossing a soft synthetic resin material supplied to the underside of the first layer. The first layer of the liner has a circular center portion that extends along the inner surface of the top wall of the body and an annular outer edge portion that extends along the outer edge of the top wall of the body and the upper end of the skirt wall, and the second layer of the liner is laminated to the center of the first layer.

特開２０１５－３３２５公報JP 2015-3325 A 特開２０１６－２６９６１公報JP 2016-26961 A

而して、本発明者等の経験によれば、上述した形態の従来の容器蓋には、第二層を型押成形する際に第二層を成形するための合成樹脂が充分円滑に所要とおりに流動せず、所要形状の第二層を型押成形することができないことがある、という解決すべき問題が存在することが判明している。 The inventors' experience has revealed that the conventional container closures described above have a problem to be solved: when the second layer is embossed, the synthetic resin used to form the second layer does not flow smoothly enough as required, making it impossible to emboss the second layer into the required shape.

本発明は、上記事実に鑑みてなされたものであり、その主たる課題は、所要形状の第二層を確実に型押成形することができる、新規且つ改良された容器蓋を提供することである。 The present invention was made in consideration of the above facts, and its main objective is to provide a new and improved container lid that can reliably emboss the second layer into the required shape.

本発明者等は、鋭意検討及び実験の結果、第一層の中央部の所要部位に半径方向外方に向かって厚さが漸次低減する円環形状の厚さ変動領域を存在せしめると、第二層を型押成形する際に第二層を成形するための合成樹脂材料が充分円滑に流動せしめることができることを見出した。 As a result of extensive research and experimentation, the inventors have discovered that by creating a ring-shaped thickness variation region in a required area in the center of the first layer, where the thickness gradually decreases radially outward, the synthetic resin material used to form the second layer can flow sufficiently smoothly when the second layer is embossed.

即ち、本発明によれば、上記主たる課題を達成する容器蓋として、
円形状の天面壁及び該天面壁の周縁から垂下する円筒形状のスカート壁を有する金属薄板製本体と、該本体の該天面壁の内面に配設された合成樹脂製ライナーとを備え、
該ライナーは該天面壁の内面に供給された硬質合成樹脂材料を型押成形することによって成形された第一層及び該第一層の下面に供給された軟質合成樹脂材料を型押成形することによって成形された第二層から構成されており、
該ライナーの該第一層は、該本体の該天面壁の内面に沿って延在する円形状の中央部と該本体の該天面壁の外周縁部内面及び該スカート壁の上端部内面に沿って延在する円環形状の外周縁部とを有し、
該ライナーの該第二層は、該第一層の該中央部に積層されており、円形状の薄肉中央部と円環形状の厚肉外周縁部とを有し、該厚肉外周縁部が容器の口頸部に密接される、
容器蓋において、
該第一層の該中央部には半径方向外方に向かって厚さが漸次低減する円環形状の厚さ変動領域が存在し、該厚さ変動領域の外周縁は該第二層の該厚肉外周縁部の内周縁に近接してその半径方向内側に位置する、
ことを特徴とする容器蓋が提供される。 That is, according to the present invention, as a container lid that achieves the above-mentioned main object,
The container is provided with a metal sheet body having a circular top wall and a cylindrical skirt wall extending downward from the periphery of the top wall, and a synthetic resin liner disposed on the inner surface of the top wall of the container,
The liner is composed of a first layer formed by embossing a hard synthetic resin material supplied to the inner surface of the top wall, and a second layer formed by embossing a soft synthetic resin material supplied to the lower surface of the first layer,
The first layer of the liner has a circular central portion extending along the inner surface of the top wall of the body and an annular outer peripheral portion extending along the inner surface of the outer peripheral portion of the top wall of the body and the inner surface of the upper end portion of the skirt wall,
the second layer of the liner is laminated to the central portion of the first layer, and has a circular thin-walled central portion and a ring-shaped thick-walled outer peripheral portion, the thick-walled outer peripheral portion being in close contact with the mouth and neck portion of the container;
In the container lid,
a thickness varying region having a circular ring shape, the thickness of which gradually decreases radially outward, is present in the central portion of the first layer, and an outer peripheral edge of the thickness varying region is located radially inward of and adjacent to an inner peripheral edge of the thick-walled outer peripheral portion of the second layer;
A container lid is provided.

該第二層の該厚肉外周縁部の半径方向内側領域には下方に突出する環状突出部が存在するのが好都合である。該第二層の該薄肉中央部における該厚さ変動領域に対向する領域では該厚さ変動領域の厚さ変動に応じて厚さが半径方向外方に向かって漸次増大するのが望ましい。該厚さ変動領域は水平に対して０．５乃至３．０度の傾斜角度で傾斜するのが好適である。口頸部の先端には外巻カールが形成されている金属薄板製容器に適用され、該ライナーの該第二層の該環状突出部の外周面が該外巻カールの内周面上端部に密接されると共に該環状突出部よりも半径方向外側に位置する該厚肉外周縁部の半径方向外側領域の下面が該外巻カールの上面乃至外周面に密接されるのが好都合である。
 The second layer preferably has an annular protrusion protruding downward in a radially inner region of the thick outer peripheral edge. In a region of the second layer facing the thickness variation region in the thin central portion, the thickness desirably increases gradually radially outward in accordance with the thickness variation of the thickness variation region. The thickness variation region is preferably inclined at an inclination angle of 0.5 to 3.0 degrees with respect to the horizontal. The present invention is applied to a sheet metal container having an outward curl formed at the tip of the mouth and neck, and the outer peripheral surface of the annular protrusion of the second layer of the liner is preferably in close contact with the upper end of the inner peripheral surface of the outward curl, and the lower surface of the radially outer region of the thick outer peripheral edge located radially outward of the annular protrusion is in close contact with the upper surface to the outer peripheral surface of the outward curl.

本明細書及び特許請求の範囲において使用する語句「上」及び「下」は、容器蓋の正立状態（即ち図１乃至図３に図示する状態）における上及び下を意味する。 The terms "upper" and "lower" used in this specification and claims refer to the upper and lower sides of the container lid in its upright position (i.e., the position shown in Figures 1 to 3).

第一層の中央部には半径方向外方に向かって厚さが漸次低減する円環形状の厚さ変動領域が存在し、この厚さ変動領域の外周縁は第二層の該厚肉外周縁部の内周縁に近接してその半径方向内側に位置する本発明の容器蓋においては、厚さ変動領域の存在によって第二層を型押成形する際に材料の流動が助長され、所要形状の第二層を確実に型押成形することができる。 In the container closure of the present invention, in which a ring-shaped thickness variation region exists in the center of the first layer, the thickness of which gradually decreases radially outward, and the outer periphery of this thickness variation region is located close to and radially inward of the inner periphery of the thick outer periphery of the second layer, the presence of the thickness variation region promotes the flow of material when the second layer is embossed, and the second layer can be reliably embossed into the required shape.

本発明に従って構成された容器蓋の好適実施形態の、一部を断面で示す正面図。1 is a front view, partially in section, of a preferred embodiment of a container lid constructed in accordance with the present invention; 図１の一部を拡大して示す拡大図。FIG. 2 is an enlarged view showing a part of FIG. 1 . 図１に示す容器蓋を薄板製容器の口頸部に装着して口頸部を密封した状態の、一部を断面で示す正面図。2 is a front view, partially in cross section, of the container lid shown in FIG. 1 attached to the mouth and neck of a thin plate container to seal the mouth and neck. 図３の一部を拡大して示す拡大図。FIG. 4 is an enlarged view showing a part of FIG. 3 .

以下、本発明に従って構成された容器蓋の好適実施形態を図示している添付図面を参照して、更に詳細に説明する。 The present invention will now be described in more detail with reference to the accompanying drawings, which show a preferred embodiment of a container lid constructed in accordance with the present invention.

図１を参照して説明すると、本発明に従って構成された、全体を番号２で示す容器蓋は、金属薄板製本体４と合成樹脂製ライナー６とを備えている。 Referring to FIG. 1, a container lid constructed in accordance with the present invention and generally designated by the number 2, comprises a sheet metal body 4 and a synthetic resin liner 6.

アルミニウム基合金薄板の如き適宜の金属薄板から形成することができる本体４は、円形状の天面壁８及びこの天面壁８の周縁から垂下する円筒形状のスカート壁１０を有する。天面壁８とスカート壁１０との境界領域は横断面において円弧形状である。スカート壁１０の上端部には周方向に連続して延びる環状凹部１２が形成されている。また、この環状凹部１２の直ぐ下方の領域においては、周方向に間隔をおいて周方向に延びる複数個のスリット（切り込み）１４が形成され、かかるスリット１４の下方に位置する領域が半径方向内方に変位されている。スカート壁１０の下端部には周方向破断可能ライン１６が配設されていて、スカート壁１０は周方向破断可能ライン１６よりも上方の主部１８と周方向破断可能ライン１６よりも下方のテンパーエビデント裾部２０とに区画されている。図示の実施形態における周方向破断可能ライン１６は、周方向に間隔をおいて周方向に延びる複数個のスリット２２とかかるスリット２２間に残留せしめられた複数個の橋絡部２４とから構成されており、タンパーエビデント裾部２０は複数個の橋絡部２４を介して主部１８に接続されている。かような本体４自体は周知の形態であり、それ故に本体４の詳細な説明は本明細書においては省略する。 The main body 4, which can be formed from an appropriate metal sheet such as an aluminum-based alloy sheet, has a circular top wall 8 and a cylindrical skirt wall 10 that hangs down from the periphery of the top wall 8. The boundary region between the top wall 8 and the skirt wall 10 has an arc shape in cross section. An annular recess 12 that extends continuously in the circumferential direction is formed at the upper end of the skirt wall 10. In addition, in the region immediately below the annular recess 12, a plurality of slits (cuts) 14 that extend in the circumferential direction at intervals in the circumferential direction are formed, and the region located below the slits 14 is displaced radially inward. A circumferential breakable line 16 is disposed at the lower end of the skirt wall 10, and the skirt wall 10 is divided into a main portion 18 above the circumferential breakable line 16 and a temper evident hem portion 20 below the circumferential breakable line 16. In the illustrated embodiment, the circumferential breakable line 16 is composed of a plurality of circumferentially extending slits 22 spaced apart from one another and a plurality of bridging portions 24 remaining between the slits 22, and the tamper-evident skirt portion 20 is connected to the main portion 18 via the plurality of bridging portions 24. Such a body 4 itself is a well-known form, and therefore a detailed description of the body 4 is omitted in this specification.

図１と共に図２を参照して説明を続けると、ライナー６は第一層２６及び第二層２８から構成されている。第一層２６は、上記本体４の天面壁８の内面に供給された合成樹脂材料を型押成形することによって成形される。更に詳しくは、本体４を倒立状態にして基台（図示していない）上に保持し、天面壁８の中央部に軟化溶融状態の合成樹脂材料を供給し、かかる合成樹脂材料に所要形状の型押部材（図示していない）を所要圧力で押圧することによって成形される。第一層２６は、ポリエチレン或いはポリプロピレンの如きガスバリア性に優れた硬質合成樹脂から成形されていることが重要である。然るに、第一層２６は密封層を構成する第二層２８よりもガスバリア性が高い。第二層２８は第一層２６の下面に供給された合成樹脂材料を型押成形することによって成形される。更に詳しくは、第一層２６が成形された本体４を倒立状態にして基台（図示していない）上に保持し、第一層２６の中央部に軟化溶融状態の合成樹脂材料を供給し、かかる合成樹脂材料を所要形状の型押部材（図示していない）を所要圧力で押圧することによって成形される。第二層２８は、ポリエチレン或いはエラストマーの如きシール性に優れた軟質合成樹脂から成形されていることが重要である。 Continuing the explanation with reference to FIG. 2 together with FIG. 1, the liner 6 is composed of a first layer 26 and a second layer 28. The first layer 26 is formed by embossing a synthetic resin material supplied to the inner surface of the top wall 8 of the main body 4. More specifically, the main body 4 is held in an inverted state on a base (not shown), a softened and molten synthetic resin material is supplied to the center of the top wall 8, and a embossing member (not shown) of a required shape is pressed against the synthetic resin material with a required pressure to form the first layer 26. It is important that the first layer 26 is formed from a hard synthetic resin with excellent gas barrier properties, such as polyethylene or polypropylene. However, the first layer 26 has a higher gas barrier property than the second layer 28 constituting the sealing layer. The second layer 28 is formed by embossing a synthetic resin material supplied to the lower surface of the first layer 26. More specifically, the main body 4 on which the first layer 26 has been molded is held in an inverted position on a base (not shown), and a softened and molten synthetic resin material is supplied to the center of the first layer 26, which is then molded by pressing the synthetic resin material with a required shape using a stamping member (not shown) at the required pressure. It is important that the second layer 28 is molded from a soft synthetic resin with excellent sealing properties, such as polyethylene or elastomer.

第一層２６は本体４の天面壁８の内面に沿って延在する円形状の中央部３０と本体４の天面壁８の外周縁部内面及びスカート壁１０の上端部内面に沿って延在する円環形状の外周縁部３２を有する。中央部３０には半径方向外方に向かって厚さが漸次低減する（従って、下面が半径方向外方に向かって上方に傾斜して延びる）円環形状の厚さ変動領域３４が存在し、この厚さ変動領域３４の外周縁は第二層２８の後述する厚肉外周縁部３８の内周面（従って後述する環状突出部４０の内周縁）に近接してその半径方向内側に位置することが重要である。厚さ変動領域３４の下面の水平に対する傾斜角度αは０．５乃至３．０度であるのが好適である。図２に明確に図示するとおり、第一層２６の中央部３０における厚さ変動領域３４よりも半径方向内側領域では厚さが変動しないのが好適である。図示の実施形態においては、第一層２６の中央部３０における厚さ変動領域３４よりも半径方向外側領域でも厚さが変動しない。第一層２６の外周縁部３２の半径方向内側領域の肉厚は中央部３０の半径方向外側領域の肉厚よりも大きく、中央部３０と外周縁部３２との境界には０．０５乃至０．４０ｍｍ程度であるのが好適である段差ｓが存在する。 The first layer 26 has a circular central portion 30 extending along the inner surface of the top wall 8 of the main body 4 and an annular outer peripheral edge portion 32 extending along the inner surface of the outer peripheral edge portion of the top wall 8 of the main body 4 and the inner surface of the upper end portion of the skirt wall 10. The central portion 30 has a ring-shaped thickness variation region 34 whose thickness gradually decreases radially outward (therefore, the lower surface extends at an upward inclination radially outward), and it is important that the outer peripheral edge of this thickness variation region 34 is located radially inwardly of the inner peripheral surface of the thick outer peripheral edge portion 38 of the second layer 28 described later (therefore, the inner peripheral edge of the annular protrusion 40 described later). The inclination angle α of the lower surface of the thickness variation region 34 with respect to the horizontal is preferably 0.5 to 3.0 degrees. As clearly shown in FIG. 2, it is preferable that the thickness does not vary in the radially inner region of the thickness variation region 34 in the central portion 30 of the first layer 26. In the illustrated embodiment, the thickness does not vary even in the radially outer region of the thickness variation region 34 in the central portion 30 of the first layer 26. The thickness of the radially inner region of the outer peripheral edge portion 32 of the first layer 26 is greater than the thickness of the radially outer region of the central portion 30, and there is a step s at the boundary between the central portion 30 and the outer peripheral edge portion 32 that is preferably about 0.05 to 0.40 mm.

第一層２６の中央部３０に積層される第二層２８は、円形状の薄肉中央部３６と円環形状の厚肉外周縁部３８とを有する。外周縁部３８の半径方向内側領域には下方に突出する環状突出部４０が存在する。 The second layer 28, which is laminated on the central portion 30 of the first layer 26, has a circular, thin-walled central portion 36 and a ring-shaped, thick-walled outer peripheral edge portion 38. The radially inner region of the outer peripheral edge portion 38 has an annular protrusion 40 that protrudes downward.

本発明に従って構成された容器蓋２においては、ライナー６を構成する第一層２６の外周縁部３２の半径方向内側領域の肉厚は中央部３０の半径方向外側領域の肉厚よりも大きく、中央部３０と外周縁部３２との境界には段差ｓが存在する、換言すれば第一層２６の外周縁部３２の半径方向内側領域の肉厚が比較的大きい故に、第二層２８を成形する際に型押部材が第一層２６の外周縁部３２の半径方向内側領域に作用するが、これによって第一層２６の外周縁部３２が破損されてしまうことが可及的に回避される。第一層２６の中央部３０の半径方向外側領域の肉厚は比較的小さく、従って第一層２６を成形するための合成樹脂材料量が過剰に増大してしまうことはない。更に、本発明に従って構成された容器蓋２においては、第一層２６の中央部３０には半径方向外方に向かって厚さが漸次低減する厚さ変動領域３４が存在する故に、第二層２８を型押成形する際に合成樹脂材料が充分円滑に半径方向外方に向けて流動し、所要形状の第二層２８を充分確実に成形することができる。 In the container lid 2 constructed according to the present invention, the thickness of the radially inner region of the outer peripheral edge 32 of the first layer 26 constituting the liner 6 is greater than the thickness of the radially outer region of the central portion 30, and a step s exists at the boundary between the central portion 30 and the outer peripheral edge 32. In other words, since the thickness of the radially inner region of the outer peripheral edge 32 of the first layer 26 is relatively large, when the second layer 28 is molded, the embossing member acts on the radially inner region of the outer peripheral edge 32 of the first layer 26, but this prevents the outer peripheral edge 32 of the first layer 26 from being damaged as much as possible. The thickness of the radially outer region of the central portion 30 of the first layer 26 is relatively small, so the amount of synthetic resin material required to mold the first layer 26 does not increase excessively. Furthermore, in the container lid 2 constructed according to the present invention, the central portion 30 of the first layer 26 has a thickness variation region 34 in which the thickness gradually decreases radially outward, so that when the second layer 28 is embossed, the synthetic resin material flows radially outward sufficiently smoothly, and the second layer 28 can be molded in the required shape with sufficient certainty.

図３及び図４には、容器蓋２が適用される容器の口頸部４２も図示されている。クロム酸処理鋼薄板、ブリキ薄板或いはアルミニウム基合金薄板の如き適宜の金属薄板から形成することができる、それ自体は周知の形態である容器の口頸部４２は、全体として略円筒形状であり、上方に向かって外径が漸次減少する上端部には外巻カール４４が形成されている。口頸部４２の主部外周面には雄螺条４６とかかる雄螺条４６の下方に位置する係止あご部４８とが形成されている。 3 and 4 also show the mouth and neck portion 42 of the container to which the container lid 2 is applied. The mouth and neck portion 42 of the container, which can be formed from a suitable metal sheet such as a chromated steel sheet, a tinplate sheet, or an aluminum-based alloy sheet, and which is a well-known form, is generally cylindrical overall, with an outward curl 44 formed at the upper end portion, the outer diameter of which gradually decreases toward the top. A male thread 46 and a locking jaw portion 48 located below the male thread 46 are formed on the outer periphery of the main portion of the mouth and neck portion 42.

容器の口頸部４２に容器蓋２を装着して口頸部４２を密封する際には、口頸部４２に容器蓋２を被嵌して下方に押圧しライナー６の第二層２８を口頸部４２の頂部に密接せしめた状態、更に詳しくは第二層２８の環状突出部４０の外周面及び環状突出部４０よりも半径方向外側に位置する厚肉外周縁部３８の半径方向外側領域の下面を口頸部４０の外巻カール４４の内周面上端乃至上面に密接した状態、を維持しながら、本体４の天面壁８の外周縁部及びスカート壁１０の上端部を図３及び図４に図示するとおりの形状に変形する。かくすると、ライナー６の第二層２８の環状突出部４０の外周面が外巻カール４４の内周面上端部に密接されると共に環状突出部４０よりも半径方向外側に位置する厚肉外周縁部３８の半径方向外側領域の下面が外巻カール４４の上面乃至外周面に密接される。そして又、容器の口頸部４２に形成されている雄螺条４６に沿って本体４のスカート壁１０の主部１８を変形して雌螺条を形成し、本体４のスカート壁１０におけるタンパーエビデント裾部２０の下端部を半径方向内方に変形して容器の口頸部４２における係止あご部４８に係止する。 When the container lid 2 is attached to the mouth and neck portion 42 of the container to seal the mouth and neck portion 42, the container lid 2 is fitted over the mouth and neck portion 42 and pressed downward to bring the second layer 28 of the liner 6 into close contact with the top of the mouth and neck portion 42, more specifically, the outer peripheral surface of the annular protrusion 40 of the second layer 28 and the lower surface of the radially outer region of the thick outer peripheral edge portion 38 located radially outside the annular protrusion 40 are kept in close contact with the upper end or upper surface of the inner peripheral surface of the outward curl 44 of the mouth and neck portion 40, while maintaining the outer peripheral edge portion of the top wall 8 of the main body 4 and the upper end of the skirt wall 10 are deformed into the shape shown in Figures 3 and 4. In this way, the outer peripheral surface of the annular protrusion 40 of the second layer 28 of the liner 6 is in close contact with the upper end of the inner peripheral surface of the outward curl 44, and the lower surface of the radially outer region of the thick outer peripheral edge portion 38 located radially outside the annular protrusion 40 is in close contact with the upper or outer peripheral surface of the outward curl 44. In addition, the main portion 18 of the skirt wall 10 of the main body 4 is deformed along the male thread 46 formed on the mouth and neck portion 42 of the container to form a female thread, and the lower end of the tamper-evident bottom portion 20 on the skirt wall 10 of the main body 4 is deformed radially inward to engage with the locking jaw portion 48 on the mouth and neck portion 42 of the container.

容器の内容物を消費するために口頸部４２を開封する際には、本体４のスカート壁８に指を掛けて容器蓋２を開方向、即ち図３において上方から見て反時計方向に回動する。かくすると、スカート壁１０の主部１８に形成されている雌螺条が口頸部４２の雄螺条４６に沿って移動する故に容器蓋２は口頸部４２に対して上方に移動される。他方、スカート壁１０のタンパーエビデント裾部２０はその下端部が口頸部４２の係止あご部４８に係止されている故に上方への移動が阻止され、スカート壁１０に形成されている周方向破断可能ライン１６における橋絡部２４に応力が生成されて橋絡部２４が破断される。しかる後においては、タンパーエビデント裾部２０を残して容器蓋２は回転と共に上方に移動して口頸部４２から離脱され、口頸部４２が開封される。 When opening the mouth and neck portion 42 to consume the contents of the container, the user places his/her fingers on the skirt wall 8 of the main body 4 and rotates the container lid 2 in the opening direction, i.e., counterclockwise as viewed from above in FIG. 3. In this way, the female thread formed on the main portion 18 of the skirt wall 10 moves along the male thread 46 of the mouth and neck portion 42, so that the container lid 2 moves upward relative to the mouth and neck portion 42. On the other hand, the tamper-evident hem portion 20 of the skirt wall 10 is prevented from moving upward because its lower end is engaged with the engaging jaw portion 48 of the mouth and neck portion 42, and stress is generated in the bridge portion 24 at the circumferential breakable line 16 formed on the skirt wall 10, causing the bridge portion 24 to break. After that, the container lid 2 moves upward with the rotation, leaving the tamper-evident hem portion 20 behind, and is detached from the mouth and neck portion 42, and the mouth and neck portion 42 is opened.

２：容器蓋
４：本体
６：ライナー
８：天面壁
１０：スカート壁
２６：第一層
２８：第二層
３０：第一層の中央部
３２：第一層の外周縁部
３４：厚さ変動領域
３６：第二層の薄肉中央部
３８：第二層の厚肉外周縁部
４０：環状突出部
４２：容器の口頸部 Description of the Reference Numerals 2: Container lid 4: Main body 6: Liner 8: Top wall 10: Skirt wall 26: First layer 28: Second layer 30: Central portion of first layer 32: Outer peripheral edge portion of first layer 34: Thickness varying region 36: Thin-walled central portion of second layer 38: Thick-walled outer peripheral edge portion of second layer 40: Annular protrusion 42: Mouth and neck portion of container

Claims (5)

円形状の天面壁及び該天面壁の周縁から垂下する円筒形状のスカート壁を有する金属薄板製本体と、該本体の該天面壁の内面に配設された合成樹脂製ライナーとを備え、
該ライナーは該天面壁の内面に供給された硬質合成樹脂材料を型押成形することによって成形された第一層及び該第一層の下面に供給された軟質合成樹脂材料を型押成形することによって成形された第二層から構成されており、
該ライナーの該第一層は、該本体の該天面壁の内面に沿って延在する円形状の中央部と該本体の該天面壁の外周縁部内面及び該スカート壁の上端部内面に沿って延在する円環形状の外周縁部とを有し、
該ライナーの該第二層は、該第一層の該中央部に積層されており、円形状の薄肉中央部と円環形状の厚肉外周縁部とを有し、該厚肉外周縁部が容器の口頸部に密接される、
容器蓋において、
該第一層の該中央部には半径方向外方に向かって厚さが漸次低減する円環形状の厚さ変動領域が存在し、該厚さ変動領域の外周縁は該第二層の該厚肉外周縁部の内周縁に近接してその半径方向内側に位置する、
ことを特徴とする容器蓋。 The container is provided with a metal sheet body having a circular top wall and a cylindrical skirt wall extending downward from the periphery of the top wall, and a synthetic resin liner disposed on the inner surface of the top wall of the container,
The liner is composed of a first layer formed by embossing a hard synthetic resin material supplied to the inner surface of the top wall, and a second layer formed by embossing a soft synthetic resin material supplied to the lower surface of the first layer,
The first layer of the liner has a circular central portion extending along the inner surface of the top wall of the body and an annular outer peripheral portion extending along the inner surface of the outer peripheral portion of the top wall of the body and the inner surface of the upper end portion of the skirt wall,
the second layer of the liner is laminated to the central portion of the first layer, and has a circular thin-walled central portion and a ring-shaped thick-walled outer peripheral portion, the thick-walled outer peripheral portion being in close contact with the mouth and neck portion of the container;
In the container lid,
a thickness varying region having a circular ring shape, the thickness of which gradually decreases radially outward, is present in the central portion of the first layer, and an outer peripheral edge of the thickness varying region is located radially inward of and adjacent to an inner peripheral edge of the thick-walled outer peripheral portion of the second layer;
A container lid characterized by: 該第二層の該厚肉外周縁部の半径方向内側領域には下方に突出する環状突出部が存在する、請求項１記載の容器蓋。 2. The container closure of claim 1 , further comprising a downwardly projecting annular projection at a radially inner region of said thickened outer periphery of said second layer. 該第二層の該薄肉中央部における該厚さ変動領域に対向する領域では該厚さ変動領域の厚さ変動に応じて厚さが半径方向外方に向かって漸次増大する、請求項１又は２記載の容器蓋。 3. The container lid according to claim 1, wherein the thickness of the second layer in the thin-walled central portion in a region facing the thickness varying region gradually increases radially outward in accordance with the thickness variation of the thickness varying region. 該厚さ変動領域は水平に対して０．５乃至３．０度の傾斜角度で傾斜する、請求項１から３までのいずれかに記載の容器蓋。 4. The container lid of claim 1 , wherein the thickness variation region is inclined at an angle of 0.5 to 3.0 degrees with respect to the horizontal. 口頸部の先端には外巻カールが形成されている金属薄板製容器に適用され、該ライナーの該第二層の該環状突出部の外周面が該外巻カールの内周面上端部に密接されると共に該環状突出部よりも半径方向外側に位置する該厚肉外周縁部の半径方向外側領域の下面が該外巻カールの上面乃至外周面に密接される、請求項２記載の容器蓋。 A container lid as described in claim 2, which is applied to a metal sheet container having an outward curl formed at the tip of the mouth and neck, wherein the outer surface of the annular protrusion of the second layer of the liner is in tight contact with the upper end of the inner surface of the outward curl, and the lower surface of the radially outer region of the thick-walled outer edge portion located radially outward from the annular protrusion is in tight contact with the upper surface to the outer surface of the outward curl.
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JP2006327678A (en) 2005-05-30 2006-12-07 Japan Crown Cork Co Ltd Container lid having oxygen absorbing ability
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JP2015003325A (en) 2013-06-19 2015-01-08 ユニバーサル製缶株式会社 Method of producing liner-provided cap, liner-provided cap and cap-provided container
JP2016026961A (en) 2014-06-27 2016-02-18 日本クロージャー株式会社 Metal cap and manufacturing method of the same

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002332059A (en) 2001-05-10 2002-11-22 Toyo Seikan Kaisha Ltd Vessel lid having lubricant drop preventive means
US7611026B1 (en) 2002-08-12 2009-11-03 Rexam Closure Systems Inc. Tamper-evident closure having a sealing disk and package for high-temperature applications
JP2006327678A (en) 2005-05-30 2006-12-07 Japan Crown Cork Co Ltd Container lid having oxygen absorbing ability
JP2015003325A (en) 2013-06-19 2015-01-08 ユニバーサル製缶株式会社 Method of producing liner-provided cap, liner-provided cap and cap-provided container
JP2016026961A (en) 2014-06-27 2016-02-18 日本クロージャー株式会社 Metal cap and manufacturing method of the same

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