JP2019112143A - Can top - Google Patents

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Publication number
JP2019112143A
JP2019112143A JP2019025444A JP2019025444A JP2019112143A JP 2019112143 A JP2019112143 A JP 2019112143A JP 2019025444 A JP2019025444 A JP 2019025444A JP 2019025444 A JP2019025444 A JP 2019025444A JP 2019112143 A JP2019112143 A JP 2019112143A
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Japan
Prior art keywords
panel
curved
lid
curved portion
peripheral edge
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JP2019025444A
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Japanese (ja)
Inventor
和洋 田口
Kazuhiro Taguchi
和洋 田口
泰浩 花房
Yasuhiro Hanabusa
泰浩 花房
長谷川　貴志
Takashi Hasegawa
貴志 長谷川
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Altemira Can Co Ltd
Container Development Ltd
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Universal Can Corp
Container Development Ltd
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Application filed by Universal Can Corp, Container Development Ltd filed Critical Universal Can Corp
Publication of JP2019112143A publication Critical patent/JP2019112143A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D7/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal
    • B65D7/12—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by wall construction or by connections between walls
    • B65D7/34—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by wall construction or by connections between walls with permanent connections between walls
    • B65D7/36—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by wall construction or by connections between walls with permanent connections between walls formed by rolling, or by rolling and pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B65D17/06—Integral, or permanently secured, end or side closures
    • B65D17/08—Closures secured by folding or rolling and pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
    • B65D2517/0001—Details
    • B65D2517/0058—Other details of container end panel
    • B65D2517/0059—General cross-sectional shape of container end panel
    • B65D2517/0061—U-shaped
    • B65D2517/0062—U-shaped and provided with an additional U-shaped peripheral channel

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)

Abstract

To enhance pressure resistance, for preventing occurrence of bulge failure and leakage during transport.SOLUTION: When a curvature radius R3 of a first curve part 18 is 1.2-4.0 mm, a curvature radius R4 of a second curve part 19 is 0.6-3.0 mm, a maximum length L1 from a common tangent A to the second curve part 19 is 0.3-0.6 mm, a maximum length L2 from a common tangent B of inner bottom surfaces of the second curve part 19 and a counter sink part 5, to the first curve part 18 is 0.4-0.7 mm, and a vertical direction dimension from an apex of a part from a shoulder part 7 to a curl part 8, to a surface of the panel part 2, is a panel depth P. A ratio (P/D1) of a panel depth P to an outer diameter D1 of the panel part 2 is 10.17% or more, whole height of the can top is 7.2 mm or less, and a ratio of an outer diameter D1 of the panel part to an outermost diameter D2 of a wound part when being wound to the can body is 0.69-0.84.SELECTED DRAWING: Figure 1

Description

本発明は、飲料用缶に用いられる缶蓋に係り、特に、内圧が作用する陽圧缶に用いられる缶蓋に関する。
本願は、２０１０年９月２２日に出願された特願２０１０−２１２８５２号に基づき優先権を主張し、その内容をここに援用する。 The present invention relates to a can lid used for a beverage can, and more particularly to a can lid used for a positive pressure can that is subject to an internal pressure.
Priority is claimed on Japanese Patent Application No. 2010-212852, filed September 22, 2010, the content of which is incorporated herein by reference.

内容物としてビールや炭酸飲料等の発泡性飲料を充填する場合、あるいは、お茶やコーヒー等の非発泡性飲料でも充填時に液体窒素が封入される場合など、密封した後に内圧が作用する、いわゆる陽圧缶では、その内圧に耐え得る強度を有することが要求される。例えば、缶蓋の耐圧強度を高めるために、カウンターシンク部の幅を小さくしたり、チャック壁部の形状を工夫したりするなど、種々の提案がなされている。
特許文献１記載の缶蓋は、鉛直方向に対するチャック壁部の傾斜角度を大きくして、カウンターシンク部の直径を小さくするとともに、そのカウンターシンク部の幅を狭くした形状とされている。
また、特許文献２記載の缶蓋は、チャック壁部を複数の湾曲部の連続形状とするとともに、カウンターシンク部の内側のパネル部との間のコーナー部を大きく傾斜させることにより、パネル部の直径を小さくした形状とされている。 When the contents are filled with effervescent beverages such as beer and carbonated drinks, or when non-effervescent beverages such as tea and coffee are filled with liquid nitrogen at the time of filling, so-called positive pressure is exerted after sealing. The pressure vessel is required to have a strength that can withstand the internal pressure. For example, in order to increase the pressure resistance of the can lid, various proposals have been made, such as reducing the width of the counter-sink portion or devising the shape of the chuck wall.
In the can lid described in Patent Document 1, the inclination angle of the chuck wall with respect to the vertical direction is increased to reduce the diameter of the counter sink, and the width of the counter sink is narrowed.
In addition, the can lid described in Patent Document 2 has a chuck wall portion having a continuous shape of a plurality of curved portions, and the corner portion between the panel portion and the inner panel portion of the counter sink portion is largely inclined, It has a reduced diameter.

特許第３８０９１９０号公報Patent No. 3809190 gazette 特表２００７−５２６８５９号公報Japanese Patent Publication No. 2007-526859

ところで、内容物が充填された缶は、殺菌のため熱処理された後、複数本ずつカートンに詰められた状態で各地に輸送されるが、その熱処理時に内圧が高まることにより、缶蓋中央のパネル部が膨出する現象が生じる。その膨出により、缶蓋のタブが缶の上端よりも突出する状態になると、タブを外力から保護できなくなるので、不良品（いわゆるバルジ不良）として処分される。また、パネル部がさらに膨出すると、カウンターシンク部が反転するバックリング現象が生じる場合もある。そのようなバルジ不良やバックリングとなるほどの膨出が生じない場合でも、カートンに詰められて長距離輸送される際に、その振動によりタブがカートンに接触するなどの原因で漏れが生じるおそれがある。
また一方では、材料コストの低減のため、缶蓋の板厚を薄肉化することも求められており、このため、さらなる耐圧性の向上が求められている。 By the way, the can filled with the contents is heat-treated for sterilization and then transported to various places in a state of being packed in a plurality of cartons, but the internal pressure is increased at the time of the heat treatment. The phenomenon of swelling of the part occurs. If the tabs of the can lid project beyond the upper end of the can due to the bulging, the tabs can not be protected from external force, and therefore, they are disposed of as defective products (so-called bulge defects). Further, when the panel portion further bulges, a buckling phenomenon may occur in which the counter sink portion is reversed. Even if such bulge failure or buckling does not occur, when the product is packed in a carton and transported for a long distance, the vibration may cause a leak due to the tab contacting the carton or the like. is there.
On the other hand, in order to reduce the material cost, it is also required to reduce the thickness of the can lid, so that further improvement of the pressure resistance is required.

本発明は、このような事情に鑑みてなされたもので、耐圧性を高めて、バルジ不良や輸送時の漏えいの発生を防止することができる缶蓋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 it is an object of the present invention to provide a can lid capable of enhancing the pressure resistance and preventing the occurrence of bulge failure and leakage during transportation.

本発明の缶蓋は、タブが取り付けられるパネル部の外周縁に、上方に向けた環状凹部を形成するカウンターシンク部が連続して形成されるとともに、該カウンターシンク部の外周縁から上方に向かうにしたがって漸次拡径するチャック壁部が形成され、該チャック壁部から半径方向外方に広がるショルダー部を介して外周縁部を下方かつ半径方向内方に向けて折り返してなるカール部が連続形成された缶蓋において、前記ショルダー部は上方に向けて凸となる円弧状に湾曲形成されるとともに、前記チャック壁部は、半径方向内方に向けて凸となる第１湾曲部と、半径方向外方に向けて凸となる第２湾曲部とが前記カウンターシンク部の外周縁から前記ショルダー部の内周縁にかけて順に形成され、前記第１湾曲部外面の曲率半径が１．２ｍｍ〜４．０ｍｍ、前記第２湾曲部外面の曲率半径が０．６ｍｍ〜３．０ｍｍであり、前記ショルダー部外面と前記第１湾曲部外面との共通接線が前記パネル部外面となす角度θが５５°〜７０°であり、前記共通接線から前記第２湾曲部外面までの最大距離が０．３ｍｍ〜０．６ｍｍとされ、前記第２湾曲部外面と前記カウンターシンク部の内底面との共通接線から前記第１湾曲部外面までの最大距離が０．４ｍｍ〜０．７ｍｍとされ、かつ、前記ショルダー部からカール部にかけた部分の頂点からパネル部表面までの鉛直方向寸法をパネル深さとしたときの前記パネル部の外径に対する前記パネル深さの比率が１０．１７％以上でかつ缶蓋の全体高さが７．２ｍｍ以下であり、缶体に巻き締めたときの巻き締め部の最外径Ｄ２に対する前記パネル部の外径Ｄ１の比が０．６９〜０．８４であることを特徴とする。   In the can lid of the present invention, a counter-sink portion forming an annular recess directed upward is continuously formed on the outer peripheral edge of the panel portion to which the tab is attached, and is directed upward from the outer peripheral edge of the counter-sink portion The chuck wall is formed to gradually expand in diameter according to the shape, and a curled portion formed by folding the outer peripheral edge downward and radially inward via the shoulder extending radially outward from the chuck wall is continuously formed In the can lid, the shoulder portion is curved in an arc shape convex upward, and the chuck wall portion is a first curved portion convex inward in the radial direction, and a radial direction A second curved portion convex outward is formed in order from the outer peripheral edge of the counter sink portion to the inner peripheral edge of the shoulder portion, and the curvature radius of the outer surface of the first curved portion is 1.2 m. The radius of curvature of the outer surface of the second curved portion is 0.6 mm to 3.0 mm, and the angle θ formed by the common tangent of the outer surface of the shoulder portion and the outer surface of the first curved portion with the outer surface of the panel portion is 55 ° to 70 °, and the maximum distance from the common tangent to the outer surface of the second curved portion is 0.3 mm to 0.6 mm, and the outer surface of the second curved portion and the inner bottom surface of the counter sink portion are common The maximum distance from the tangent to the outer surface of the first curved portion is 0.4 mm to 0.7 mm, and the vertical dimension from the top of the portion of the shoulder portion to the curled portion to the surface of the panel portion is the panel depth When the ratio of the panel depth to the outer diameter of the panel portion is 10.17% or more, and the entire height of the can lid is 7.2 mm or less, the maximum of the tightening portion when being tightened to the can The above-mentioned pattern for the outer diameter D2 The ratio of the outer diameter D1 of the pole tip is characterized in that it is a 0.69 to 0.84.

つまり、タブが缶の上端より上方に突出するのは、パネル部が上方に持ち上がるように変位することによるものであり、したがって、このパネル部の変位を抑制することにより、バルジ不良や輸送時の漏れを防止することができる。このため、本発明の缶蓋では、パネル部の外径とパネル深さとの比率を１０．１７％以上とすることにより、パネル部の外径に対するパネル深さを比較的大きい設計として、パネル部が膨出してもタブが缶の上端から突出しにくくした。その効果を得るには１０．１７％以上必要であるが、缶蓋の全体高さが７．２ｍｍを超えると、充填時の缶蓋供給の際にトラブルが発生したり、充填速度の高速化を妨げるなどの不都合が生じる。
また、チャック壁部については、半径方向内方に凸となる第１湾曲部と半径方向外方に凸となる第２湾曲部とにより、内圧が作用すると、湾曲部の曲率を拡大又は縮小することによって変形を吸収して、パネル部の膨出やバックリングの発生を防止することができる。 That is, the reason why the tab protrudes above the upper end of the can is because the panel portion is displaced so as to be lifted upward. Therefore, by suppressing the displacement of the panel portion, bulge failure or transportation It is possible to prevent leakage. Therefore, in the can lid of the present invention, by setting the ratio of the outer diameter of the panel portion to the panel depth to be 10.17% or more, the panel portion is designed to have a relatively large panel depth with respect to the outer diameter of the panel portion. Even if the bulging, the tab did not easily protrude from the top of the can. 10.17% or more is required to obtain the effect, but if the overall height of the can lid exceeds 7.2 mm, problems may occur when supplying the can lid at the time of filling, or the filling speed may be increased. Problems such as preventing
Further, with regard to the chuck wall portion, the curvature of the curved portion is expanded or reduced when the internal pressure acts by the first curved portion convex in the radial direction and the second curved portion convex in the radial direction. Thus, the deformation can be absorbed, and the occurrence of bulging or buckling of the panel portion can be prevented.

また、本発明の缶蓋において、前記パネル部から前記カウンターシンク部に至るコーナー部は、前記パネル部に隣接状態の内側屈曲部と、前記カウンターシンク部の内側壁部に隣接状態の外側屈曲部と、これら両屈曲部の間を連結する傾斜部とから構成されているとよい。
コーナー部に傾斜部を有する分、パネル部の外周縁がカウンターシンク部から離間させられる。したがって、カウンターシンク部及びその外側のチャック壁部の形状、寸法を変えることなく、パネル部の外径を小さくすることができ、パネル部の膨出をさらに抑制することができる。 Further, in the can lid according to the present invention, the corner portion extending from the panel portion to the counter sink portion is an inner bending portion adjacent to the panel portion and an outer bending portion adjacent to the inner side wall portion of the counter sink portion. And an inclined portion connecting between the two bent portions.
The outer peripheral edge of the panel portion is separated from the counter sink portion by having the inclined portion at the corner portion. Therefore, the outer diameter of the panel portion can be reduced without changing the shapes and dimensions of the counter sink portion and the chuck wall portion outside the counter sink portion, and the expansion of the panel portion can be further suppressed.

本発明の缶蓋によれば、パネル部の外径に対するパネル深さを比較的大きい設計としてタブが缶の上端から突出しにくくしている。また、チャック壁に半径方向内方に凸となる第１湾曲部と半径方向外方に凸となる第２湾曲部とを設けたことにより、内圧に対する変形を吸収することができる。これらの相乗作用により、耐圧性を高めて、バルジ不良やバックリング、輸送時の漏えいの発生を防止することができる。   According to the can lid of the present invention, the tab is difficult to protrude from the upper end of the can by designing the panel depth relatively to the outer diameter of the panel portion relatively large. Further, by providing the chuck wall with the first curved portion that is convex inward in the radial direction and the second curved portion that is convex outward in the radial direction, deformation against the internal pressure can be absorbed. By these synergetic actions, pressure resistance can be enhanced to prevent bulge failure, buckling, and occurrence of leakage during transportation.

本発明の実施形態における缶蓋の要部の縦断面図である。It is a longitudinal cross-sectional view of the principal part of the can lid in the embodiment of the present invention. 図１における缶蓋を缶体に巻き締めた状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the state which wound and tightened the can lid in FIG. 1 to the can. 缶蓋の振動漏れ試験を実施する際のカートンの積載状態を示すモデル図である。It is a model figure which shows the loading state of the carton at the time of implementing the vibration leak test of a can lid.

以下、本発明に係る缶蓋の実施形態を図面を参照しながら説明する。
この実施形態の缶蓋１は、図１及び図２に示すように、その中央部分に配置される円板状をなすパネル部２と、パネル部２の外周縁からコーナー部３を介して連続し下方に向けた環状凹部４を形成するカウンターシンク部５と、カウンターシンク部５の外周縁から上方に向けてほぼ拡径しながら延在するチャック壁部６と、チャック壁部６の外周縁から連なるショルダー部７と、ショルダー部７に連続するカール部８とから構成されている。 Hereinafter, an embodiment of a can lid according to the present invention will be described with reference to the drawings.
The can lid 1 of this embodiment, as shown in FIGS. 1 and 2, is continuous from the outer peripheral edge of the panel portion 2 through the corner portion 3 with a disc-shaped panel portion 2 disposed in the central portion thereof. A counter-sink portion 5 forming an annular recess 4 directed downward, a chuck wall portion 6 extending while enlarging substantially from the outer peripheral edge of the counter-sink portion 5 upward, and an outer peripheral edge of the chuck wall portion 6 And a curled portion 8 continuous with the shoulder portion 7.

パネル部２は、全体としては円板状に形成され、その中心にタブが取り付けられるとともに、上面に、このタブを起こすことによって開口され飲み口となるスコア及びそのスコアの周辺を補強するビード、タブを起こす際の指掛け部を形成するための凹部等（いずれも図示略）が形成されていることにより、若干の凹凸が形成される。   The panel portion 2 is formed in a disk shape as a whole, and a tab is attached to the center thereof, and on the upper surface, a bead which is opened by raising the tab and becomes a spout and a bead for reinforcing the periphery of the score By forming a recess or the like (not shown) for forming a finger hook when raising the tab, some unevenness is formed.

パネル部２とカウンターシンク部５との間のコーナー部３は、パネル部２の外周縁に連なる上向き凸状の内側屈曲部１１と、カウンターシンク部５の内側壁部１２に連なる上向き凸状の外側屈曲部１３と、これら両屈曲部１１，１３の間を連結する傾斜部１４とが連続して形成された形状とされている。   The corner portion 3 between the panel portion 2 and the counter sink portion 5 is an upwardly convex inner bent portion 11 connected to the outer peripheral edge of the panel portion 2 and an upward convex shape connected to the inner side wall portion 12 of the counter sink portion 5. It is set as the shape in which the outer side bending part 13 and the inclination part 14 which connects between these both the bending parts 11 and 13 were formed continuously.

カウンターシンク部５では、コーナー部３に連なる内側壁部１２が鉛直下方に向かうに従ってわずかに拡径するように延びており、その内側壁部１２の下縁から内側湾曲部１５及びその外側に外側湾曲部１６が連続している。これら湾曲部１５，１６は、カウンターシンク部５の底部を半分ずつ形成するように、内側湾曲部１５は、下方かつ半径方向内方に向けて凸となる形状とされ、外側湾曲部１６は、下方かつ半径方向外方に向けて凸となる形状とされている。そして、その外側湾曲部１６から上方に向けて若干拡径しながら外側壁部１７が延びており、これら内側壁部１２、内側湾曲部１５、外側湾曲部１６、外側壁部１７によってほぼＵ字状の断面のカウンターシンク部５が構成されている。
この場合、内側湾曲部１５及び外側湾曲部１６とも、その内周面の曲率半径Ｒ１，Ｒ２はほぼ同じ寸法に形成されている。また、内側壁部１２及び外側壁部１７が下方に向かうにしたがって徐々に接近するように傾斜していることにより、環状凹部４は、下方に向かうにしたがって徐々に幅が狭くなっている。 In the counter-sink portion 5, the inner side wall portion 12 connected to the corner portion 3 extends so as to slightly expand in diameter as it goes vertically downward, and from the lower edge of the inner side wall portion 12 to the inner curved portion 15 and the outer side thereof. The curved portion 16 is continuous. The inner curved portion 15 is formed to be convex downward and radially inward so that the curved portions 15 and 16 form the bottom of the counter sink portion 5 in half, and the outer curved portion 16 is formed by It is shaped to be convex downward and radially outward. Then, the outer wall 17 extends slightly upward from the outer curved portion 16 and the U-shape is substantially U-shaped by the inner sidewall 12, the inner curved portion 15, the outer curved portion 16, and the outer wall 17. The counter-sink part 5 of the cross section of the cross section is comprised.
In this case, the curvature radiuses R1 and R2 of the inner peripheral surface of both the inner curved portion 15 and the outer curved portion 16 are formed to have substantially the same dimensions. In addition, since the inner side wall portion 12 and the outer side wall portion 17 are inclined so as to gradually approach as they go downward, the annular recess 4 is gradually narrowed in width as it goes downward.

チャック壁部６は、カウンターシンク部５の外側壁部１７の上端縁に連続し半径方向内方に向けて凸となるように湾曲した第１湾曲部１８と、第１湾曲部１８の上端縁に連続し半径方向外方に向けて凸となるように湾曲した第２湾曲部１９とからなる形状とされており、これら第１湾曲部１８及び第２湾曲部１９の連続形状により、全体としては上方に向けて拡径する形状とされている。
ショルダー部７は、チャック壁部６の第２湾曲部１９の上端縁（外周縁）に連続し、上方に向けて凸となるように湾曲しながら拡径して半径方向外方に延びている。この場合、チャック壁部６の第２湾曲部１９は、その内周面（缶蓋１としては外面）を斜め上方に向けた状態に湾曲していることから、全体としては下方から上方に向かうにしたがって漸次拡径する形状とされており、この第２湾曲部１９に連続するショルダー部７も下方から上方に向けて拡径している。
カール部８は、ショルダー部７の外周縁に連続して半径方向外方に延在し、その外周縁部を下方かつ半径方向内方に向けて折り返してなる形状とされている。 The chuck wall portion 6 is continuous with the upper end edge of the outer wall portion 17 of the counter sink portion 5 and is curved so as to be convex radially inward, and the upper end edge of the first curved portion 18 And the second curved portion 19 curved so as to be convex outward in the radial direction. The continuous shape of the first curved portion 18 and the second curved portion 19 makes it as a whole. Is shaped to expand in the upward direction.
The shoulder portion 7 is continuous with the upper end edge (outer peripheral edge) of the second curved portion 19 of the chuck wall 6 and extends radially outward while curving so as to be convex upward. . In this case, since the second curved portion 19 of the chuck wall 6 is curved in such a manner that the inner peripheral surface (the outer surface as the can lid 1) is directed obliquely upward, the entire second curved portion 19 moves upward from below. The shoulder portion 7 continuous with the second curved portion 19 is also expanded in diameter from the lower side to the upper side.
The curled portion 8 extends radially outward continuously from the outer peripheral edge of the shoulder portion 7 and has a shape in which the outer peripheral edge portion is folded downward and radially inward.

一方、この缶蓋１が巻き締められる缶体２１は、有底筒状の胴部（図示略）から縮径したネック部２２の上端に、屈曲部２３を介して外向きのフランジ部２４が連続して形成された形状とされている。
この缶体２1に缶蓋１が被せられると、缶体２１の屈曲部２３に缶蓋１のショルダー部７における外周面（缶蓋１としては内面）側の凹面が対向するように配置され、フランジ部２４の上面にショルダー部７からカール部８にかけた裏面が対向して配置される。そして、その状態で、缶蓋１のカール部８を缶体２１のフランジ部２４と一体に巻き込みながら円周方向に沿って巻き締めると、カール部８の巻き込み部の中に折り返された状態のフランジ部２４が入り込んで缶蓋１と缶体２１とが相互に相手を挟み込んでなる二重巻き締め部２５が形成される。 On the other hand, in the can body 21 in which the can lid 1 is wound and tightened, the flange portion 24 facing outward through the bent portion 23 is provided at the upper end of the neck portion 22 reduced in diameter from the bottomed cylindrical body (not shown). It is made into the shape formed continuously.
When the can lid 1 is put on the can 21, the concave portion on the outer peripheral surface (the inner surface as the can lid 1) side of the shoulder portion 7 of the can lid 1 is arranged to face the bent portion 23 of the can 21 The back surface of the shoulder portion 7 and the curled portion 8 is disposed opposite to the upper surface of the flange portion 24. Then, in this state, when the curled portion 8 of the can lid 1 is wound along the circumferential direction while being wound integrally with the flange portion 24 of the can body 21, a state in which it is folded back into the wound portion of the curled portion 8 A double-wound tightening portion 25 in which the can lid 1 and the can body 21 sandwich each other is formed by the flange portion 24 entering.

このように構成される缶蓋１において、公称径が２０４（缶体２１に缶蓋１を巻き締めた後の巻き締め部２５の最外径Ｄ２が５６．５〜５６．７ｍｍ、巻き締め前の缶蓋１のカール部８の最外径が６２．０〜６２．４ｍｍ）の場合、パネル部２の外径Ｄ１は、４０．０〜４８．６９ｍｍとされ、パネル深さＰは、４．２５〜５．０５ｍｍとされる。パネル深さＰとは、缶蓋１を缶体２１に巻き締める前のショルダー部７からカール部８にかけた部分の頂点からパネル部２表面までの鉛直方向寸法をいう。また、カウンターシンク部５の内底面を形成している両湾曲部１５，１６の曲率半径（缶蓋１としての外面側の曲率半径）Ｒ１，Ｒ２は、両方とも０．１５〜０．７５ｍｍとされる。その範囲であれば、両湾曲部１５，１６とも同じ曲率半径としてもよいし、異なる曲率半径としてもよい。
また、第１湾曲部１８外面の曲率半径Ｒ３は１．２ｍｍ〜４．０ｍｍ、第２湾曲部１９外面の曲率半径Ｒ４は０．６ｍｍ〜３．０ｍｍに設定される。また、ショルダー部７外面の曲率半径Ｒ５は１．２ｍｍ〜４．０ｍｍに設定される。そして、ショルダー部７外面と第１湾曲部１８外面との共通接線Ａがパネル部２外面となす角度θが５５°〜７０°とされ、共通接線Ａから第２湾曲部１９外面までの最大距離Ｌ１が０．３ｍｍ〜０．６ｍｍとされる。また、第２湾曲１９部外面とカウンターシンク部５の内底面における外側湾曲部１６との共通接線Ｂから第１湾曲部１８外面までの最大距離Ｌ２が０．４ｍｍ〜０．７ｍｍとされている。 In the can lid 1 configured in this manner, the nominal diameter is 204 (the outermost diameter D2 of the tightening portion 25 after the can lid 1 is wound and tightened on the can 21 is 56.5 to 56.7 mm, before the tightening) When the outermost diameter of the curled portion 8 of the can lid 1 is 62.0 to 62.4 mm, the outer diameter D1 of the panel portion 2 is 40.0 to 48.69 mm, and the panel depth P is 4 It is set to .25-5.05 mm. The panel depth P refers to the dimension in the vertical direction from the top of the portion of the shoulder 7 to the curled portion 8 before the can lid 1 is wound and tightened on the can 21 to the surface of the panel 2. Further, the radius of curvature (curvature radius on the outer surface side as the can lid 1) R1, R2 of both the curved portions 15, 16 forming the inner bottom surface of the counter sink portion 5 is both 0.15 to 0.75 mm. Be done. Within this range, both the curved portions 15 and 16 may have the same radius of curvature, or may have different radii of curvature.
The curvature radius R3 of the outer surface of the first curved portion 18 is set to 1.2 mm to 4.0 mm, and the curvature radius R4 of the outer surface of the second curved portion 19 is set to 0.6 mm to 3.0 mm. The curvature radius R5 of the outer surface of the shoulder portion 7 is set to 1.2 mm to 4.0 mm. Then, an angle θ formed by the common tangent line A of the shoulder portion 7 outer surface and the first curved portion 18 outer surface with the panel portion 2 outer surface is 55 ° to 70 °, and the maximum distance from the common tangent line A to the second curved portion 19 outer surface L1 is 0.3 mm to 0.6 mm. Further, the maximum distance L2 from the tangent line B common to the outer curved portion 16 at the outer surface of the second curved portion 19 and the inner bottom surface of the counter sink 5 to the outer surface of the first curved portion 18 is 0.4 mm to 0.7 mm. .

公称径が２０２（巻き締め部２５の最外径Ｄ２が５３．６〜５４．４ｍｍ、巻き締め前の缶蓋１のカール部８の最外径が５９．２〜５９．６ｍｍ）の場合は、パネル部２の外径Ｄ１は、３８．０〜４６．３６ｍｍとされ、パネル深さＰは、３．８〜４．７９ｍｍとされる。カウンターシンク部５の内底面における両湾曲部１５，１６の曲率半径Ｒ１，Ｒ２は、２０４の場合と同様、両方とも０．１５〜０．７５ｍｍとされる。また、ショルダー部７外面の曲率半径Ｒ５、ショルダー部７外面と第１湾曲部１８外面との共通接線Ａがパネル部２外面となす角度θ、共通接線Ａから第２湾曲部１９外面までの最大距離Ｌ１、第２湾曲部１９外面とカウンターシンク部５の内底面における外側湾曲部１６との共通接線Ｂから第１湾曲部１８外面までの最大距離Ｌ２も２０４の場合と同様の寸法設定とされる。   When the nominal diameter is 202 (the outermost diameter D2 of the winding portion 25 is 53.6 to 54.4 mm, and the outermost diameter of the curled portion 8 of the can lid 1 before the winding is 59.2 to 59.6 mm) The outer diameter D1 of the panel portion 2 is 38.0 to 46.36 mm, and the panel depth P is 3.8 to 4.79 mm. The radii of curvature R1 and R2 of the curved portions 15 and 16 on the inner bottom surface of the counter sink 5 are both 0.15 to 0.75 mm, as in the case of 204. The radius of curvature R5 of the outer surface of the shoulder portion 7, the angle θ between the outer surface of the shoulder portion 7 and the outer surface of the first curved portion 18 with the outer surface of the panel portion 2, the maximum from the common tangent A to the outer surface of the second curved portion 19 The distance L 1, and the maximum distance L 2 from the common tangent B of the second curved portion 19 outer surface and the outer curved portion 16 at the inner bottom surface of the counter sink 5 to the first curved portion 18 outer surface Ru.

公称径が２０６（巻き締めた後の巻き締め部２５の最外径Ｄ２が５９．２〜５９．４ｍｍ、巻き締め前の缶蓋１のカール部８の最外径が６４．５〜６４．９ｍｍ）の場合は、パネル部２の外径Ｄ１は、４２．０〜４８．９ｍｍとされ、パネル深さＰは、４．３〜５．０５ｍｍとされる。カウンターシンク部５の内底面における両湾曲部１５，１６の曲率半径Ｒ１，Ｒ２は、両方とも０．１５〜０．７５ｍｍとされる。ショルダー部７外面の曲率半径Ｒ５、ショルダー部７外面と第１湾曲部１８外面との共通接線Ａがパネル部２外面となす角度θ、共通接線Ａから第２湾曲部１９外面までの最大距離Ｌ１、第２湾曲部１９外面とカウンターシンク部５の内底面における外側湾曲部１６との共通接線Ｂから第１湾曲部１８外面までの最大距離Ｌ２も２０４の場合と同様の寸法設定とされる。   Nominal diameter 206 (the outermost diameter D2 of the tightening portion 25 after tightening is 59.2 to 59.4 mm, the outermost diameter of the curled portion 8 of the can lid 1 before tightening is 64.5 to 64. In the case of 9 mm), the outer diameter D1 of the panel portion 2 is 42.0 to 48.9 mm, and the panel depth P is 4.3 to 5.05 mm. The curvature radii R1 and R2 of both the curved portions 15 and 16 on the inner bottom surface of the counter sink portion 5 are both 0.15 to 0.75 mm. The radius of curvature R5 of the outer surface of the shoulder portion 7, the angle θ that the common tangent line A between the outer surface of the shoulder portion 7 and the outer surface of the first curved portion 18 forms with the outer surface of the panel portion 2, the maximum distance L1 from the common tangent line A to the outer surface of the second curved portion 19 The maximum distance L2 from the tangent B common to the outer curved portion 16 on the outer surface of the second curved portion 19 and the inner bottom surface of the counter sink 5 to the outer surface of the first curved portion 18 is also dimensioned similarly to the case of 204.

いずれの場合も、内圧によってパネル部２が図１の鎖線で示すようにわずかに膨出するが、その膨出変形によってタブが缶の上端面から突出しないようにするためには、パネル部２の外径Ｄ１に対するパネル深さＰの比率（Ｐ／Ｄ１）が重要な要因であり、これを１０．１７％以上とすることが好ましい。１０．１７％未満の場合は、内圧によってパネル部２が膨出したときに、タブの一部が缶の上端から突出し易く、一方、この比率（Ｐ／Ｄ１）が大きくなり過ぎることにより、缶蓋１の全体高さｈが７．２ｍｍを超えると、巻き締め機において缶体２１に缶蓋１を供給するときのパスラインを高さが大きくなった分、調整する必要があるとともに、供給時にジャム発生などの不都合が生じ易く、また、缶体２１の上方に送られた缶蓋１が缶体２１のフランジ部２４に載置されるまでのストロークも大きくなり、その分、高速充填を妨げるおそれがある。したがって、この缶蓋１の全体高さｈは７．２ｍｍ以内が好ましい。   In either case, the panel portion 2 slightly bulges as shown by the chain line in FIG. 1 by the internal pressure, but in order to prevent the tab from protruding from the upper end face of the can by the bulge deformation, the panel portion 2 The ratio (P / D1) of the panel depth P to the outer diameter D1 of the above is an important factor, and it is preferable to make it 10.17% or more. If the ratio is less than 10.17%, when the panel portion 2 bulges due to the internal pressure, a part of the tab tends to protrude from the upper end of the can, while the ratio (P / D1) becomes too large. When the overall height h of the lid 1 exceeds 7.2 mm, it is necessary to adjust the pass line for supplying the can lid 1 to the can 21 in the tightening machine by the increased height, and At the same time, problems such as jamming are likely to occur, and the stroke until the can lid 1 sent above the can 21 is placed on the flange 24 of the can 21 also becomes large, and high-speed filling There is a risk of interference. Therefore, the overall height h of the can lid 1 is preferably within 7.2 mm.

また、チャック壁部６が第１湾曲部１８及び第２湾曲部１９により構成されているため、外力が加わった場合においても、各湾曲部１８，１９の曲率が拡大または縮小することで外力による変形を吸収し、缶蓋１の変形を抑制することが可能になり、パネル部２の膨出、又はバックリングの発生を抑えることができる。
特に、缶蓋１が膨出変形し、カウンターシンク部５が反転しようとした場合に、第１湾曲部１８外面の曲率半径Ｒ３が１．２ｍｍ〜４．０ｍｍ、第２湾曲部１９外面の曲率半径Ｒ４が０．６ｍｍ〜３．０ｍｍに設定されているため、バックリング時の応力集中を避けることができる。第１湾曲部１８の曲率半径Ｒ３が１．２ｍｍ未満、あるいは第２湾曲部１９の曲率半径Ｒ４が０．６ｍｍ未満であると、バックリング強度が高まり、バックリングは起こりにくくなるが、湾曲部形成のためのプレス加工が厳しくなるとともに、万一バックリングした場合に応力集中し易く、このため亀裂が入り易く、内容物が漏出するおそれがある。一方、第１湾曲部１８の曲率半径Ｒ３が４．０ｍｍを超え、あるいは第２湾曲部１９の曲率半径Ｒ４が３．０ｍｍを超えると、バックリング時の衝撃を緩衝するためのバネ作用が低下してしまう。
また、第１湾曲部１８及び第２湾曲部１９が交互に逆方向に湾曲しているため、これら湾曲部１８，１９が缶の半径方向内方あるいは半径方向外方のいずれに変形しても、弾性変形によるバネ作用によって、変形を吸収することができ、膨出変形又はバックリングが生じにくくなる。また、仮に、缶内圧が上昇し、カウンターシンク部５が反転した場合においても、その変形速度を両湾曲部１８，１９の弾性により緩和させながら変形し、すなわち、この部分に作用するエネルギーを緩和させることが可能になり、亀裂が発生することを抑制することができ、内容物の漏出を抑えることが可能なる。 Further, since the chuck wall 6 is constituted by the first curved portion 18 and the second curved portion 19, even when an external force is applied, the curvature of each of the curved portions 18 and 19 is expanded or reduced by the external force. It is possible to absorb the deformation and to suppress the deformation of the can lid 1 and to suppress the occurrence of the bulging or buckling of the panel portion 2.
In particular, when the can lid 1 is bulgingly deformed and the counter-sink portion 5 tries to reverse, the curvature radius R3 of the outer surface of the first curved portion 18 is 1.2 mm to 4.0 mm, and the curvature of the outer surface of the second curved portion 19 Since the radius R4 is set to 0.6 mm to 3.0 mm, stress concentration during buckling can be avoided. If the radius of curvature R3 of the first curved portion 18 is less than 1.2 mm, or the radius of curvature R4 of the second curved portion 19 is less than 0.6 mm, the buckling strength is increased and buckling hardly occurs, but the curved portion As the pressing for forming becomes severe, stress concentration is likely to occur in the event of buckling, and therefore cracking is likely to occur, and the contents may leak. On the other hand, if the radius of curvature R3 of the first curved portion 18 exceeds 4.0 mm or the radius of curvature R4 of the second curved portion 19 exceeds 3.0 mm, the spring action for cushioning the impact during buckling is reduced. Resulting in.
In addition, since the first curved portion 18 and the second curved portion 19 are alternately curved in opposite directions, the curved portions 18 and 19 may be deformed either radially inward or radially outward of the can. By the spring action by elastic deformation, deformation can be absorbed, and bulging deformation or buckling is less likely to occur. In addition, even if the internal pressure of the can rises and the counter-sink portion 5 is reversed, it is deformed while being relaxed by the elasticity of the both curved portions 18 and 19, that is, the energy acting on this portion is relaxed. It is possible to prevent the occurrence of cracks and to suppress the leakage of contents.

この場合、ショルダー部７外面と第１湾曲部１８外面との共通接線Ａがパネル部２外面となす角度θが５５°〜７０°としたが、この角度θが小さいと、パネル部２が小径となって耐圧強度は高まるが、パネル部２の径が小さくなり、小径となったパネル部２に設けた飲み口も同様に小さくなり、内容物の注ぎ性が著しく低下する。また、角度θが大きいと、パネル部２の径が大きくなり、耐圧強度の低下を招く。したがって、この角度θは、５５°〜７０°が好ましい。
また、共通接線Ａから第２湾曲部１９外面までの最大距離Ｌ１が０．３ｍｍ〜０．６ｍｍとしたが、この距離Ｌ１が大きいとパネル部２の膨出は小さくなるが、バックリング強度は低下する。距離Ｌ１が小さいと缶体２１との隙間が大きくなって密封性を損なうおそれがある。このため、距離Ｌ１は０．３ｍｍ〜０．６ｍｍとするのがよい。
さらに、第２湾曲１９部外面とカウンターシンク部５の内底面における外側湾曲部１６との共通接線Ｂから第１湾曲部１８外面までの最大距離Ｌ２は０．４ｍｍ〜０．７ｍｍとしたが、この距離Ｌ２が小さいと耐圧強度が低下し、大きいとカウンターシンク部５を狭めることになって巻き締め不良となり易い。このため、この距離Ｌ２は０．４ｍｍ〜０．７ｍｍとするのがよい。 In this case, although the angle θ formed by the common tangent line A between the outer surface of the shoulder portion 7 and the outer surface of the first curved portion 18 with the outer surface of the panel portion 2 is 55 ° to 70 °, if this angle θ is small, the panel portion 2 has a small diameter As a result, the pressure resistance strength is increased, but the diameter of the panel portion 2 is reduced, the spout provided on the panel portion 2 having a smaller diameter is similarly reduced, and the pourability of the content is significantly reduced. Further, when the angle θ is large, the diameter of the panel portion 2 becomes large, and the pressure resistance strength is lowered. Therefore, the angle θ is preferably 55 ° to 70 °.
In addition, although the maximum distance L1 from the common tangent A to the outer surface of the second curved portion 19 is 0.3 mm to 0.6 mm, the bulging of the panel portion 2 is reduced when the distance L1 is large, but the buckling strength is descend. If the distance L1 is small, the gap with the can 21 may be large, and the sealing performance may be impaired. Therefore, the distance L1 is preferably 0.3 mm to 0.6 mm.
Furthermore, the maximum distance L2 from the tangent line B common to the outer curved portion 16 at the outer surface of the second curved portion 19 and the inner bottom surface of the counter sink 5 to the outer surface of the first curved portion 18 is 0.4 mm to 0.7 mm, When the distance L2 is small, the pressure resistance strength is reduced, and when it is large, the counter-sink portion 5 is narrowed, which tends to cause a winding failure. Therefore, the distance L2 is preferably 0.4 mm to 0.7 mm.

次に、このように構成した缶蓋１について、そのパネル部２の外径Ｄ１、パネル深さＰ等の各部寸法を変えた種々のサンプルを作成し、振動漏れ試験、耐圧試験等を実施した。
使用した缶蓋及び缶体は、その公称径が２０４、２０２、２０６の三種類とした。缶蓋の板厚Ｔは、２０４の場合が０．２１５〜０．２３０ｍｍ、２０２の場合が０．２１５〜０．２３０ｍｍ、２０６の場合が０．２１５〜０．２５０ｍｍとした。カウンターシンク部５の内底面の曲率半径は、内側湾曲部も外側湾曲部も同じ曲率半径としたので、各表ではＲとして統一した。また、第１湾曲部の曲率半径Ｒ３、第２湾曲部の曲率半径Ｒ４、ショルダー部の曲率半径Ｒ５、共通接線Ａの角度θ、共通接線Ａからの最大距離Ｌ１、共通接線Ｂからの最大距離Ｌ２は、前述した数値範囲内のものとした。
表１は公称径２０４、表２が公称径２０２、表３が公称径２０６の場合をそれぞれ示している。 Next, with respect to the can lid 1 configured as described above, various samples in which the dimensions of each portion such as the outer diameter D1 of the panel portion 2 and the panel depth P were changed were created and the vibration leakage test, pressure resistance test and the like were performed. .
The can lids and cans used had three nominal diameters of 204, 202 and 206. The plate thickness T of the can lid was 0.215 to 0.230 mm in the case of 204, 0.215 to 0.230 mm in the case of 202, and 0.215 to 0.250 mm in the case of 206. The radius of curvature of the inner bottom surface of the counter-sink portion 5 is the same as the radius of curvature of the inner curved portion and the outer curved portion, and therefore, is unified as R in each table. Further, the radius of curvature R3 of the first curved portion, the radius of curvature R4 of the second curved portion, the radius of curvature R5 of the shoulder portion, the angle θ of the common tangent A, the maximum distance L1 from the common tangent A, and the maximum distance from the common tangent B L2 was within the aforementioned numerical range.
Table 1 shows the nominal diameter 204, Table 2 shows the nominal diameter 202, and Table 3 shows the nominal diameter 206.

振動漏れ試験は、株式会社振研製の三方向同時振動試験装置を用い、図３に示すように、内容物を充填した缶３１を２４缶カートン３２に入れ、その上にダミー用の缶３３を入れたカートン３４を２ケース載せ、さらにその上に錘３５を載せた状態とする。これらカートン３２，３４は、２４個並べた缶を周回するように組み立てられており、その周回方向には一箇所にのみ折り込み部３２ａ，３４ａが形成される。そして、各カートン３２，３４の折り込み部３２ａ，３４ａを同じ方向に合わせた状態に配置する。錘３５は、５１ｋｇ、振動数は１０Ｈｚ、振幅は５ｍｍ、振動方向は上下方向のみとし、５分毎に漏れ発生を確認し、カートン３２内のいずれかの缶３１で漏れが生じた時間により評価した。３０分以上漏れが発生しなかったものを良品とする。図３の符号３６はカートン３２，３４の周囲に配置されるガイドである。   In the vibration leak test, using the three-way simultaneous vibration test apparatus manufactured by Shoken Co., Ltd., as shown in FIG. 3, cans 31 filled with contents are put in 24 cans carton 32 and cans for dummy 33 are placed thereon. Two cartons 34 loaded are placed on top of which two weights 35 are placed. These cartons 32 and 34 are assembled so as to circulate 24 cans, and the folding portions 32a and 34a are formed at only one place in the circulation direction. Then, the folded portions 32a and 34a of the cartons 32 and 34 are arranged in the same direction. The weight 35 is 51 kg, the frequency is 10 Hz, the amplitude is 5 mm, the vibration direction is vertical only, and the occurrence of a leak is confirmed every 5 minutes, and the time when the leak occurs in any can 31 in the carton 32 did. A product that has not leaked for 30 minutes or more is considered good. Reference numeral 36 in FIG. 3 is a guide disposed around the cartons 32, 34.

耐圧試験は、空の缶体に缶蓋を巻き締めた状態とし、缶体を中間部で切断した後、有限会社フローリスエンタープライズ製の耐圧試験装置を使用し、１００ｋＰａ／３０秒の昇圧速度で水圧をかけて、缶蓋の一部が部分的に突出する角出しと呼ばれるバックリング現象やスコア割れが生じたときの圧力を測定した。５７０ｋＰａまでバックリングやスコア割れが生じなかったものを良品とする。
総合判定は、これら振動漏れ試験及び耐圧試験で良品とされ、かつ、缶蓋の全体高さが７．２ｍｍ以内のものを○、これらのうちのいずれかの基準を満たさなかったものを×とした。 In the pressure test, the can lid is wound around an empty can, and after cutting the can at the middle part, using a pressure testing device manufactured by Floris Enterprise Ltd., the water pressure is increased at a pressure increase rate of 100 kPa / 30 seconds. The pressure was measured when a buckling phenomenon called score out where a part of the can lid partially protrudes and a score crack occurred. A product with no buckling or score breakage up to 570 kPa is considered good.
The comprehensive judgment was made good in these vibration leakage test and pressure resistance test, and those with an overall height of the can lid of 7.2 mm or less as ○, those without any of these criteria as × did.

Figure 2019112143
Figure 2019112143

Figure 2019112143
Figure 2019112143

Figure 2019112143
Figure 2019112143

これらの結果から明らかなように、パネル部２の外径Ｄ１に対するパネル深さＰの比率（Ｐ／Ｄ１）が１０．１７％以上である缶蓋においては、振動漏れ試験でも３０分以上という基準を満たしており、また、耐圧試験においても良好な耐圧性を発揮し、さらに缶蓋の全体高さが７．２ｍｍ以下に抑えられていると、充填時のトラブル発生や充填速度低下を招くおそれはない。   As is clear from these results, in the case of a can lid in which the ratio (P / D1) of the panel depth P to the outer diameter D1 of the panel portion 2 is 10.17% or more, the reference of 30 minutes or more is In addition, if the entire height of the can lid is suppressed to 7.2 mm or less, it causes troubles in filling and a decrease in filling speed. It is not.

なお、本発明は上記実施形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲で種々の変更を加えることが可能である。
例えば、パネル部とカウンターシンク部との間のコーナー部を二つの屈曲部の間に傾斜部を形成した形状としたが、パネル部とカウンターシンク部の内側壁部との間を一つの曲率半径の屈曲部で連続させた形状としてもよい。 The present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the present invention.
For example, although the corner portion between the panel portion and the counter sink portion has a shape in which the inclined portion is formed between the two bent portions, one curvature radius between the panel portion and the inner side wall portion of the counter sink portion It is good also as a shape made to be continuous at a bent part.

本発明の缶蓋は、飲料用缶、特に内圧が作用する陽圧缶に好適に用いられる。   The can lid of the present invention is suitably used for a beverage can, in particular, a positive pressure can under an internal pressure.

１ 缶蓋
２ パネル部
３ コーナー部
４ 環状凹部
５ カウンターシンク部
６ チャック壁部
７ ショルダー部
８ カール部
１１ 内側屈曲部
１２ 内側壁部
１３ 外側屈曲部
１４ 傾斜部
１５ 内側湾曲部
１６ 外側湾曲部
１７ 外側壁部
１８ 第１湾曲部
１９ 第２湾曲部
２１ 缶体
２２ ネック部
２３ 屈曲部
２４ フランジ部 DESCRIPTION OF SYMBOLS 1 Can lid 2 panel part 3 corner part 4 annular recessed part 5 counter sink part 6 chuck wall part 7 shoulder part 8 curled part 11 inner bent part 12 inner side wall part 13 outer bent part 14 inclined part 15 inner curved part 16 outer curved part 17 Outer wall portion 18 first curved portion 19 second curved portion 21 can body 22 neck portion 23 bent portion 24 flange portion

Claims (1)

タブが取り付けられるパネル部の外周縁に、上方に向けた環状凹部を形成するカウンターシンク部が連続して形成されるとともに、該カウンターシンク部の外周縁から上方に向かうにしたがって漸次拡径するチャック壁部が形成され、該チャック壁部から半径方向外方に広がるショルダー部を介して外周縁部を下方かつ半径方向内方に向けて折り返してなるカール部が連続形成された缶蓋において、前記ショルダー部は上方に向けて凸となる円弧状に湾曲形成されるとともに、前記チャック壁部は、半径方向内方に向けて凸となる第１湾曲部と、半径方向外方に向けて凸となる第２湾曲部とが前記カウンターシンク部の外周縁から前記ショルダー部の内周縁にかけて順に形成され、前記第１湾曲部外面の曲率半径が１．２ｍｍ〜４．０ｍｍ、前記第２湾曲部外面の曲率半径が０．６ｍｍ〜３．０ｍｍであり、前記ショルダー部外面と前記第１湾曲部外面との共通接線が前記パネル部外面となす角度θが５５°〜７０°であり、前記共通接線から前記第２湾曲部外面までの最大距離が０．３ｍｍ〜０．６ｍｍとされ、前記第２湾曲部外面と前記カウンターシンク部の内底面との共通接線から前記第１湾曲部外面までの最大距離が０．４ｍｍ〜０．７ｍｍとされ、かつ、前記ショルダー部からカール部にかけた部分の頂点からパネル部表面までの鉛直方向寸法をパネル深さとしたときの前記パネル部の外径に対する前記パネル深さの比率が１０．１７％以上でかつ缶蓋の全体高さが７．２ｍｍ以下であり、缶体に巻き締めたときの巻き締め部の最外径Ｄ２に対する前記パネル部の外径Ｄ１の比が０．６９〜０．８４であることを特徴とする缶蓋。   A counter-sink portion forming an annular recess directed upward is continuously formed on the outer peripheral edge of the panel portion to which the tab is attached, and the chuck gradually expands in diameter as it goes upward from the outer peripheral edge of the counter-sink portion A can lid in which a wall portion is formed, and a curled portion formed by folding an outer peripheral edge downwardly and radially inwards via a shoulder portion extending radially outward from the chuck wall is continuously formed. The shoulder portion is curved in an arc shape that is convex upward, and the chuck wall portion is a first curved portion that is convex inward in the radial direction, and a convex that is outward in the radial direction And the second curved portion is sequentially formed from the outer peripheral edge of the counter sink portion to the inner peripheral edge of the shoulder portion, and the curvature radius of the outer surface of the first curved portion is 1.2 mm to 4.0 mm, The radius of curvature of the outer surface of the second curved portion is 0.6 mm to 3.0 mm, and the angle θ formed by the common tangent of the outer surface of the shoulder portion and the outer surface of the first curved portion with the outer surface of the panel portion is 55 ° to 70 ° And the maximum distance from the common tangent to the outer surface of the second curved portion is 0.3 mm to 0.6 mm, and the first tangent from the common tangent of the outer surface of the second curved portion and the inner bottom surface of the counter sink portion The panel portion when the maximum distance to the outer surface of the curved portion is 0.4 mm to 0.7 mm and the vertical dimension from the top of the portion of the shoulder portion to the curled portion to the surface of the panel portion is the panel depth The ratio of the panel depth to the outside diameter is 10.17% or more, and the overall height of the can lid is 7.2 mm or less, and the above relative to the outermost diameter D2 of the wound portion when wound and tightened on the can Panel outside diameter D1 Can lid the ratio is equal to or is from 0.69 to 0.84.
JP2019025444A 2010-09-22 2019-02-15 Can top Pending JP2019112143A (en)

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JP2014019479A (en) * 2012-07-19 2014-02-03 Daiwa Can Co Ltd Can-top
AU2014274115B2 (en) * 2013-05-31 2018-01-18 Crown Packaging Technology, Inc. Beverage can end having an arcuate panel wall and curved transition wall
JP2016084144A (en) * 2014-10-24 2016-05-19 株式会社神戸製鋼所 Can end and can using the same
CN106672390B (en) * 2017-03-07 2018-07-13 苏州斯莱克精密设备股份有限公司 Pressure-resistant basic lid, easy open cover and the pop can with easy open cover
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