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JP2020132252A - Can lid - Google Patents

Can lid Download PDF

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Publication number
JP2020132252A
JP2020132252A JP2019031435A JP2019031435A JP2020132252A JP 2020132252 A JP2020132252 A JP 2020132252A JP 2019031435 A JP2019031435 A JP 2019031435A JP 2019031435 A JP2019031435 A JP 2019031435A JP 2020132252 A JP2020132252 A JP 2020132252A
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JP
Japan
Prior art keywords
layer
lid
score line
panel
panel portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2019031435A
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Japanese (ja)
Inventor
正博 塩谷
Masahiro Shiotani
正博 塩谷
泰知 堀江
Yasutomo Horie
泰知 堀江
理央 宮下
Rio Miyashita
理央 宮下
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Daiwa Can Co Ltd
Original Assignee
Daiwa Can Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daiwa Can Co Ltd filed Critical Daiwa Can Co Ltd
Priority to JP2019031435A priority Critical patent/JP2020132252A/en
Priority to CN202080010462.5A priority patent/CN113329944A/en
Priority to PCT/JP2020/003448 priority patent/WO2020174997A1/en
Priority to TW109105814A priority patent/TW202031559A/en
Publication of JP2020132252A publication Critical patent/JP2020132252A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
    • B21D51/44—Making closures, e.g. caps
    • 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
    • B65D17/28—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness
    • B65D17/40—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness characterised by having the line of weakness extending circumferentially of the container mouth

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers Opened By Tearing Frangible Portions (AREA)

Abstract

To provide a can lid exhibiting an excellent anticorrosive property, that is capable of acquiring safety of the can lid after being unsealed.SOLUTION: There is provided a can lid 1 comprising a multi-layer part 14 formed on at least one of an inner side panel part 5 and an outer side panel part 7. A tip part 20 of a folded-back part 19 of a second layer 16 and a third layer 17 forms a protection part for a fracture end formed to a first layer 15 by opening the can lid 1, and a gap D1 between the second layer 16 and an end part 15A on a score line 4 side of the first layer 15 in an axial line direction of the can lid 1 is narrower than a gap D2 between the second layer 16 and an end part 15B on an opposite side of the score line 4 of the first layer 15.SELECTED DRAWING: Figure 3

Description

この発明は、全面開口タイプの缶蓋に関し、特に、開蓋後における破断端を安全にした缶蓋に関するものである。 The present invention relates to a fully open type can lid, and more particularly to a can lid in which a fractured end is made safe after the lid is opened.

この種の缶蓋の一例が特許文献１ないし３に記載されている。特許文献１に記載された缶蓋は、内容物に対する耐食性のある樹脂被膜が形成された金属板によって構成されている。その缶蓋は円板状のパネル部を備え、パネル部の外周部に易破断線であるスコア線が環状に形成されている。パネル部の半径方向でスコア線より内側の内側パネル部が開口片となっている。その内側パネル部の外周縁部と、半径方向でスコア線より外側の外側パネル部の内周縁部とのそれぞれに、パネル部を２回、折り畳んで重層部が形成されている。それらの重層部における２つの折り返し部のうち、スコア線側に位置する折り返し部がいわゆる保護部となっており、それらの保護部に、缶蓋を開封することによって生じた破断端が接近して配置されるように各重層部が構成されている。具体的には、缶蓋の軸線方向への各重層部の潰し量を大きくすることによって各重層部の高さが可及的に低く設定されている。また、内側パネル部と外側パネル部とは、ほぼ同一の平面上に形成されている。 An example of this type of can lid is described in Patent Documents 1 to 3. The can lid described in Patent Document 1 is composed of a metal plate on which a resin film having corrosion resistance to the contents is formed. The can lid is provided with a disk-shaped panel portion, and a score line, which is an easy breaking line, is formed in an annular shape on the outer peripheral portion of the panel portion. The inner panel portion inside the score line in the radial direction of the panel portion is an opening piece. A multi-layered portion is formed by folding the panel portion twice at each of the outer peripheral edge portion of the inner panel portion and the inner peripheral edge portion of the outer panel portion outside the score line in the radial direction. Of the two folded parts in those multi-layered parts, the folded part located on the score line side is a so-called protective part, and the broken end generated by opening the can lid approaches the protected part. Each layered portion is configured to be arranged. Specifically, the height of each layered portion is set as low as possible by increasing the amount of crushing of each layered portion in the axial direction of the can lid. Further, the inner panel portion and the outer panel portion are formed on substantially the same plane.

特許文献２や特許文献３に記載された缶蓋では、パネル部の半径方向で外周部は、その中央部に対して容器の内側に傾斜して形成されている。その外周部にパネル部の外形に倣った環状のスコア線が形成されている。また、特許文献２に記載された缶蓋では、缶蓋を開封することによって生じた破断端を保護するループ部が、パネル部の半径方向でスコア線を挟んだ両側にそれぞれに形成されている。特許文献３に記載された缶蓋では、パネル部の半径方向でスコア線よりも外側部分に上記のループ部が形成されている。それらのループ部は、特許文献１に記載された重層部と同様に、パネル部を２回、折り畳んで構成されており、それらのループ部における２つの折り返し部のうち、スコア線側に位置する折り返し部がいわゆる保護部となっている。 In the can lids described in Patent Documents 2 and 3, the outer peripheral portion of the panel portion in the radial direction is formed so as to be inclined inward of the container with respect to the central portion thereof. An annular score line that follows the outer shape of the panel portion is formed on the outer peripheral portion. Further, in the can lid described in Patent Document 2, loop portions for protecting the fractured ends generated by opening the can lid are formed on both sides of the panel portion in the radial direction with the score line sandwiched. .. In the can lid described in Patent Document 3, the above loop portion is formed in a portion outside the score line in the radial direction of the panel portion. Similar to the multi-layered portion described in Patent Document 1, those loop portions are configured by folding the panel portion twice, and are located on the score line side of the two folded portions in the loop portions. The folded part is a so-called protective part.

特開２００６−２６４７０７号公報Japanese Unexamined Patent Publication No. 2006-264707 特公平４−５５９４１号公報Special Fair 4-55941 Gazette 特開昭６０−２０４４５２号公報Japanese Unexamined Patent Publication No. 60-204452

特許文献１に記載されているように、缶蓋を開封することによって生じた破断端と保護部として機能する折り返し部とを接近して配置するために、缶蓋の軸線方向への各重層部の潰し量を大きくすると、重層部の変形に追従して樹脂被膜が変形することができず、樹脂被膜に割れや亀裂などの欠損が生じる可能性がある。特に、このような欠損が缶蓋の内面に生じると、缶蓋の内面品位が低下し、また、露出した金属板と内容物とが接触して金属板が腐食する可能性がある。一方、重層部の潰し量を小さくすると、保護部として機能する折り返し部から破断端が離隔してしまい、安全性が低下する可能性がある。なお、特許文献２および３に記載された缶蓋であっても、パネル部を折り畳んでループ部を形成し、そのループ部の折り返し部によって破断端を保護するように構成されているため、特許文献１と同様の課題がある。 As described in Patent Document 1, each layered portion in the axial direction of the can lid is arranged so that the fractured end generated by opening the can lid and the folded portion that functions as a protective portion are arranged close to each other. If the amount of crushing is increased, the resin coating cannot be deformed following the deformation of the multi-layered portion, and the resin coating may be cracked or cracked. In particular, when such a defect occurs on the inner surface of the can lid, the quality of the inner surface of the can lid is deteriorated, and the exposed metal plate and the contents may come into contact with each other to corrode the metal plate. On the other hand, if the amount of crushing of the multi-layered portion is reduced, the fractured end is separated from the folded portion that functions as a protective portion, which may reduce safety. Even in the can lids described in Patent Documents 2 and 3, the panel portion is folded to form a loop portion, and the folded portion of the loop portion is configured to protect the broken end. There is a problem similar to that of Document 1.

この発明は、上記の技術的課題に着目してなされたものであって、開封後における缶蓋の安全性を確保できると共に、耐食性が良好な缶蓋を提供することを目的とするものである。 The present invention has been made by paying attention to the above technical problems, and an object of the present invention is to provide a can lid which can ensure the safety of the can lid after opening and has good corrosion resistance. ..

この発明は、上記の目的を達成するために、円板状のパネル部と、前記パネル部の半径方向で前記パネル部の周縁部よりも内側に前記周縁部に沿って形成された環状のスコア線と、前記スコア線の内側の部分である内側パネル部と、前記スコア線の外側の部分である外側パネル部と、前記内側パネル部に固着された開封操作用のタブと、前記内側パネル部と前記外側パネル部との少なくともいずれか一方に、前記スコア線と隣接しかつ前記パネル部を折り畳んで形成された重層部とを備え、前記重層部は、前記スコア線から前記半径方向に延びる第１層と、前記第１層を前記半径方向で前記スコア線側に折り返して形成された第２層と、前記第２層を前記半径方向で前記スコア線とは反対側に折り返して形成された第３層とを有している缶蓋において、前記第２層と前記第３層との折り返し部の先端部が、前記缶蓋を開封することによって前記第１層に形成された破断端の保護部を成しており、かつ、前記缶蓋の軸線方向で、前記第２層と前記第１層における前記スコア線側の端部との間隔が、前記第２層と前記第１層における前記スコア線とは反対側の端部との間隔よりも狭いことを特徴としている。 In the present invention, in order to achieve the above object, a disc-shaped panel portion and an annular score formed along the peripheral edge portion inward of the peripheral edge portion of the panel portion in the radial direction of the panel portion. A line, an inner panel portion that is an inner portion of the score line, an outer panel portion that is an outer portion of the score line, a tab for opening operation fixed to the inner panel portion, and the inner panel portion. And at least one of the outer panel portion includes a layered portion adjacent to the score line and formed by folding the panel portion, and the layered portion extends in the radial direction from the score line. A first layer, a second layer formed by folding the first layer toward the score line in the radial direction, and a second layer formed by folding the second layer in the radial direction on the opposite side of the score line. In a can lid having a third layer, a tip portion of a folded portion between the second layer and the third layer is a broken end formed in the first layer by opening the can lid. The distance between the second layer and the end of the first layer on the score line side in the axial direction of the can lid, which forms a protective portion, is in the second layer and the first layer. It is characterized in that it is narrower than the distance from the end opposite to the score line.

この発明では、前記重層部は、前記外側パネル部に形成されていてよい。 In the present invention, the layered portion may be formed on the outer panel portion.

この発明では、前記外側パネル部と前記内側パネル部とは、前記スコア線を境界として屈曲して形成されていてよい。 In the present invention, the outer panel portion and the inner panel portion may be formed by bending with the score line as a boundary.

この発明では、前記缶蓋は、両面のうちの少なくともいずれか一方の面に耐食性のある合成樹脂被膜が形成された金属板から形成されており、前記合成樹脂被膜は塗膜によって形成されていてよい。 In the present invention, the can lid is formed of a metal plate having a corrosion-resistant synthetic resin film formed on at least one of both sides, and the synthetic resin film is formed of a coating film. Good.

この発明によれば、パネル部を三層に折り畳んで重層部が形成されており、その三層のうち、第２層と第３層との折り返し部の先端部が、缶蓋を開封することによって生じた第１層の破断端に被さった状態になることにより前記破断端の保護部として機能するようになっている。具体的には、内側パネル部と外側パネル部との少なくともいずれか一方に、重層部が形成されている。外側パネル部に重層部が形成されている場合と、内側パネル部に重層部が形成されている場合と、あるいは外側パネル部と内側パネル部との両方に重層部が形成されている場合とのいずれの場合であっても、軸線方向で第２層と第１層におけるスコア線側の端部との間隔が、第２層と第１層におけるスコア線とは反対側の端部との間隔よりも狭く設定されている。つまり、缶蓋を開封することによって生じた第１層の破断端のいわゆる保護性を特には損なうことなく、各折り返し部の曲率半径を大きくしたり、重層部の全体の潰し量を小さくしたりすることができる。その結果、缶蓋の内面に割れや亀裂などの欠損が生じにくくなり、内面に欠損が生じることによる内面品位の低下を抑制できると共に、缶蓋の耐食性を向上できる。また、先端部と第１層の破断端とが接近しているため、つまり、上記の破断端は先端部によって保護されるため、破断端に指などが単独で接触しにくくなり、安全性が向上する。 According to the present invention, the panel portion is folded into three layers to form a multi-layer portion, and among the three layers, the tip portion of the folded portion of the second layer and the third layer opens the can lid. By covering the fractured end of the first layer caused by the above, it functions as a protective portion of the fractured end. Specifically, a multi-layer portion is formed on at least one of the inner panel portion and the outer panel portion. When a multi-layered portion is formed on the outer panel portion, when a multi-layered portion is formed on the inner panel portion, or when a multi-layered portion is formed on both the outer panel portion and the inner panel portion. In any case, the distance between the end of the second layer and the first layer on the score line side in the axial direction is the distance between the second layer and the end of the first layer on the opposite side of the score line. Is set narrower than. That is, the radius of curvature of each folded portion can be increased or the total amount of crushing of the layered portion can be reduced without particularly impairing the so-called protective property of the fractured end of the first layer caused by opening the can lid. can do. As a result, defects such as cracks and cracks are less likely to occur on the inner surface of the can lid, deterioration of inner surface quality due to defects on the inner surface can be suppressed, and corrosion resistance of the can lid can be improved. Further, since the tip portion and the fractured end of the first layer are close to each other, that is, the above-mentioned fractured end is protected by the tip portion, it becomes difficult for a finger or the like to come into contact with the fractured end independently, and safety is improved. improves.

この発明に係る缶蓋の一例を示す正面図である。It is a front view which shows an example of the can lid which concerns on this invention. この発明に係る缶蓋をその中心を通る直線に沿って切断した断面図である。It is sectional drawing which cut the can lid which concerns on this invention along the straight line passing through the center. この発明に係る缶蓋の外周部の一部を拡大して示す断面図である。It is sectional drawing which shows the part of the outer peripheral part of the can lid which concerns on this invention enlarged.

つぎに、この発明に係る缶蓋を具体例に基づいて説明する。その缶蓋は果物や魚肉、野菜などの食品を内容物として充填する図示しない缶容器の開口部を密封するものである。上記の缶蓋は、内容物を取り出しやすく、また、缶容器を開封して缶蓋の開口片を取り除いた後に、缶容器を器として使用できるようにするために、缶蓋のほぼ全面を開口できるように構成されたいわゆるフルオープンタイプの缶蓋である。さらに、上記の缶蓋は、内容物と接触することによる腐食を抑制するために、少なくとも内容物と接触する内面に、耐食性のある合成樹脂被膜が施されたアルミニウムやスチール、あるいは、アルミ合金等の従来知られている金属板を素材としており、その金属板からプレス成形される。なお、上述した缶容器は、缶胴に底部が一体に構成されているツーピース缶や、缶胴と底部とは別体として構成されているスリーピース缶であってよい。合成樹脂被膜は従来知られている耐食性のある合成樹脂被膜と同様に構成されており、一例として、ポリエステル系樹脂であるポリエチレンテレフタレート樹脂の塗膜によって構成されている。 Next, the can lid according to the present invention will be described based on a specific example. The can lid seals the opening of a can container (not shown) filled with foods such as fruits, fish meat, and vegetables as contents. The above can lid opens almost the entire surface of the can lid so that the contents can be easily taken out and the can container can be used as a container after opening the can container and removing the opening piece of the can lid. It is a so-called fully open type can lid that is configured so that it can be used. Further, in order to suppress corrosion due to contact with the contents, the above-mentioned can lid is made of aluminum, steel, aluminum alloy, etc., in which at least the inner surface in contact with the contents is coated with a corrosion-resistant synthetic resin film. The material is a conventionally known metal plate, and the metal plate is press-molded. The can container described above may be a two-piece can in which the bottom is integrally formed with the can body, or a three-piece can in which the can body and the bottom are separately formed. The synthetic resin film is configured in the same manner as the conventionally known corrosion-resistant synthetic resin film, and as an example, it is composed of a coating film of polyethylene terephthalate resin which is a polyester resin.

図１は、この発明に係る缶蓋１の一例を示す正面図である。図２は、この発明に係る缶蓋１をその中心を通る直線に沿って切断した断面図である。図１および図２に示すように、缶蓋１は円板状のパネル部２を備えており、パネル部２の外周部の全体には、缶蓋１を図示しない缶胴に巻き締めるためのフランジ部３が形成されている。パネル部２のうち、缶蓋１の半径方向でフランジ部３よりも内側には、パネル部２の円周方向の全周に亘って易破断線であるスコア線４が形成されている。パネル部２のうち、スコア線４によって区画された内側部分がこの発明の内側パネル部に相当する開口片５となっている。半径方向で開口片５の上面における一方側に偏って缶蓋１の開封操作用のタブ６が取り付けられている。パネル部２のうち、スコア線４の外側部分とフランジ部３との間の部分が外側パネル部７となっている。 FIG. 1 is a front view showing an example of a can lid 1 according to the present invention. FIG. 2 is a cross-sectional view of the can lid 1 according to the present invention cut along a straight line passing through the center thereof. As shown in FIGS. 1 and 2, the can lid 1 is provided with a disc-shaped panel portion 2, and the can lid 1 is wound around a can body (not shown) on the entire outer peripheral portion of the panel portion 2. The flange portion 3 is formed. Within the panel portion 2 in the radial direction of the can lid 1 and inside the flange portion 3, a score line 4 which is an easy break line is formed over the entire circumference of the panel portion 2 in the circumferential direction. Of the panel portion 2, the inner portion partitioned by the score line 4 is the opening piece 5 corresponding to the inner panel portion of the present invention. A tab 6 for opening the can lid 1 is attached to one side of the upper surface of the opening piece 5 in the radial direction. Of the panel portion 2, the portion between the outer portion of the score line 4 and the flange portion 3 is the outer panel portion 7.

ここでスコア線４の形状および開口片５の形状について説明すると、スコア線４は所定の残厚が生じるようにパネル部２に形成したＶ字状断面の切り込み線もしくは窪み線であって、破断がスムーズに進行するように滑らかな曲線として形成されている。このスコア線４はパネル部２から開口片５を除去できるようにするために、パネル部２の外形に倣った環状に形成されている。したがって、スコア線４に沿って破断を進行させて開口片５を除去することによって生じる開口部の形状は開口片５の外形と同様の形状になる。なお、スコア線４は缶蓋１の外面に形成されている。これにより、パネル部２にスコア線４を形成することによる缶蓋１の内面の合成樹脂被膜の損傷を抑制することができる。 Here, the shape of the score line 4 and the shape of the opening piece 5 will be described. The score line 4 is a cut line or a recess line having a V-shaped cross section formed in the panel portion 2 so as to generate a predetermined residual thickness, and is broken. Is formed as a smooth curve so that The score line 4 is formed in an annular shape that follows the outer shape of the panel portion 2 so that the opening piece 5 can be removed from the panel portion 2. Therefore, the shape of the opening formed by removing the opening piece 5 by proceeding the fracture along the score line 4 becomes the same shape as the outer shape of the opening piece 5. The score line 4 is formed on the outer surface of the can lid 1. As a result, damage to the synthetic resin film on the inner surface of the can lid 1 due to the formation of the score line 4 on the panel portion 2 can be suppressed.

タブ６はテコ作用によってスコア線４の一部に破断を生じさせ、その後に開口片５を引き上げることによってスコア線４に沿って破断を進行させて缶蓋１から開口片５を切り離すものである。したがって、タブ６の一方の端部には、開封操作時にタブ６を引き上げるために指を掛ける指掛け部８が形成されており、他方の端部には、開口片５を押し下げてスコア線４の一部に破断を生じさせる押し下げ部９が形成されている。指掛け部８はここに示す例では、環状に形成されている。押し下げ部９は開口片５におけるスコア線４の近傍にまで延びており、スコア線４の近傍の開口片５に接触もしくは可及的に接近して設けられている。また、タブ６の長さ方向で押し下げ部９側に貫通孔が形成されている。これに対してパネル部２における貫通孔に対応する箇所に、パネル部２の外面側に突出したリベット部１０が形成されている。貫通孔にリベット部１０を挿入し、貫通孔から突出したリベット部１０の上部をカシメることにより、パネル部２にタブ６が取り付けられている。 The tab 6 causes a break in a part of the score line 4 by a lever action, and then pulls up the opening piece 5 to proceed the break along the score line 4 and separate the opening piece 5 from the can lid 1. .. Therefore, one end of the tab 6 is formed with a finger hook 8 on which a finger is hooked to pull up the tab 6 during the opening operation, and the opening piece 5 is pushed down on the other end of the score line 4. A push-down portion 9 that causes a break is partially formed. In the example shown here, the finger hook portion 8 is formed in an annular shape. The pushing-down portion 9 extends to the vicinity of the score line 4 in the opening piece 5, and is provided in contact with or as close as possible to the opening piece 5 in the vicinity of the score line 4. Further, a through hole is formed on the push-down portion 9 side in the length direction of the tab 6. On the other hand, a rivet portion 10 projecting to the outer surface side of the panel portion 2 is formed at a portion corresponding to the through hole in the panel portion 2. The tab 6 is attached to the panel portion 2 by inserting the rivet portion 10 into the through hole and caulking the upper portion of the rivet portion 10 protruding from the through hole.

また、パネル部２には、当該パネル部２の剛性を向上させるビード部１１が形成されている。ビード部１１は、図１に示す例では、スコア線４に沿いかつ押し下げ部９側に開口した円弧状であって、缶蓋１の外面側にパネル部２から突出して形成されている。パネル部２における指掛け部８に対応する箇所には、つまり、缶蓋１の高さ方向で指掛け部８の下側には、缶蓋１の内面側に窪んでおり、指掛け部８に指を掛けやすくする指掛け用凹部１２が形成されている。さらに、缶蓋１の開口初期操作時におけるタブ６の引き上げを容易にするための補助スコア線１３が、半径方向でリベット部１０の内側に形成されている。補助スコア線１３は、図１に示すように、リベット部１０の外周に沿って湾曲した部分から図１の横方向（パネル部２の円周方向）に円弧状に延びている。 Further, the panel portion 2 is formed with a bead portion 11 for improving the rigidity of the panel portion 2. In the example shown in FIG. 1, the bead portion 11 has an arc shape that is open along the score line 4 and on the push-down portion 9 side, and is formed so as to protrude from the panel portion 2 on the outer surface side of the can lid 1. The portion of the panel portion 2 corresponding to the finger hook portion 8, that is, the lower side of the finger hook portion 8 in the height direction of the can lid 1, is recessed on the inner surface side of the can lid 1, and the finger is placed on the finger hook portion 8. A finger hook recess 12 is formed to facilitate hooking. Further, an auxiliary score line 13 for facilitating the pulling up of the tab 6 at the initial operation of opening the can lid 1 is formed inside the rivet portion 10 in the radial direction. As shown in FIG. 1, the auxiliary score line 13 extends in an arc shape in the lateral direction (circumferential direction of the panel portion 2) of FIG. 1 from a portion curved along the outer circumference of the rivet portion 10.

図３は、この発明に係る缶蓋の外周部の一部を拡大して示す断面図である。図３に示すように、外側パネル部７には、パネル部２を折り畳んで重層部１４が形成されている。重層部１４はスコア線４から半径方向で外側に延びる下層１５と、下層１５をスコア線４側に折り返して下層１５の上側に位置する中間層１６と、中間層１６をスコア線４とは反対に折り返して中間層１６の上側に位置する上層１７とによって構成されている。上層１７に滑らかに連続してフランジ部３が形成されている。なお、下層１５がこの発明の第１層に相当し、中間層１６がこの発明の第２層に相当し、上層１７がこの発明の第３層に相当している。 FIG. 3 is an enlarged cross-sectional view showing a part of the outer peripheral portion of the can lid according to the present invention. As shown in FIG. 3, the outer panel portion 7 is formed with a multi-layer portion 14 by folding the panel portion 2. The layered portion 14 has a lower layer 15 extending outward in the radial direction from the score line 4, an intermediate layer 16 located above the lower layer 15 by folding the lower layer 15 toward the score line 4, and the intermediate layer 16 opposite to the score line 4. It is composed of an upper layer 17 located above the intermediate layer 16 by folding back. The flange portion 3 is formed smoothly and continuously on the upper layer 17. The lower layer 15 corresponds to the first layer of the present invention, the intermediate layer 16 corresponds to the second layer of the present invention, and the upper layer 17 corresponds to the third layer of the present invention.

下層１５と開口片５とはスコア線４を境界あるいは屈曲点として屈曲して形成されている。具体的には、下層１５は開口片５に対して図示しない缶容器の内側に傾斜して形成されている。つまり、下層１５と開口片５とは同一平面もしくは同一の直線上に形成されていない。中間層１６と上層１７と開口片５とは、図３に示す例では、互いにほぼ平行に設定されている。下層１５と中間層１６とは第１折り返し部１８によって滑らかに接続されており、中間層１６と上層１７とは第２折り返し部１９によって滑らかに接続されている。したがって、軸線方向における下層１５と中間層１６との間隔は、半径方向で内側から外側に向かって次第に広くなっている。また、軸線方向における重層部１４の厚さあるいは高さは、半径方向で内側から外側に向かって次第に高くなっている。各折り返し部１８，１９の曲率半径はほぼ同じ曲率半径に設定され、または、第１折り返し部１８の曲率半径が第２折り返し部１９の曲率半径よりも大きく設定されている。 The lower layer 15 and the opening piece 5 are formed by bending the score line 4 as a boundary or a bending point. Specifically, the lower layer 15 is formed so as to be inclined inside a can container (not shown) with respect to the opening piece 5. That is, the lower layer 15 and the opening piece 5 are not formed on the same plane or the same straight line. In the example shown in FIG. 3, the intermediate layer 16, the upper layer 17, and the opening piece 5 are set substantially parallel to each other. The lower layer 15 and the intermediate layer 16 are smoothly connected by the first folded portion 18, and the intermediate layer 16 and the upper layer 17 are smoothly connected by the second folded portion 19. Therefore, the distance between the lower layer 15 and the intermediate layer 16 in the axial direction gradually increases from the inside to the outside in the radial direction. Further, the thickness or height of the layered portion 14 in the axial direction gradually increases from the inside to the outside in the radial direction. The radius of curvature of each of the folded portions 18 and 19 is set to be substantially the same radius of curvature, or the radius of curvature of the first folded portion 18 is set to be larger than the radius of curvature of the second folded portion 19.

第２折り返し部１９の先端部２０は、スコア線４の上側であって、半径方向でスコア線４とほぼ同一の半径位置、もしくは、半径方向でスコア線４より僅かに外側に位置している。第２折り返し部１９の先端部２０は、要は、缶蓋１を開封することによって生じた下層１５の内周縁部１５Ａに形成される破断端に被さった状態になるように構成されている。そして、図３に示すように、缶蓋１の軸線方向において、下層１５の内周縁部１５Ａは、下層１５の外周縁部１５Ｂよりも先端部２０側つまり中間層１６に接近して構成されている。そのため、前記軸線方向で下層１５の内周縁部１５と中間層１６との間隔Ｄ１は、下層１５の外周縁部１５と中間層１６との間隔Ｄ２よりも狭い。言い換えれば、下層１５と中間層１６とによって形成される空間における前記軸線方向の高さは、前記半径方向で内側から外側に向かって次第に高くなっている。なお、第２折り返し部１９が、この発明の第２層と第３層との折り返し部に相当しており、第２折り返し部１９の先端部２０が、この発明の保護部に相当している。 The tip portion 20 of the second folded-back portion 19 is above the score line 4 and is located at a radial position substantially the same as the score line 4 in the radial direction or slightly outside the score line 4 in the radial direction. .. The tip portion 20 of the second folded-back portion 19 is configured so as to cover the fractured end formed on the inner peripheral edge portion 15A of the lower layer 15 generated by opening the can lid 1. Then, as shown in FIG. 3, in the axial direction of the can lid 1, the inner peripheral edge portion 15A of the lower layer 15 is configured closer to the tip portion 20 side, that is, the intermediate layer 16 than the outer peripheral edge portion 15B of the lower layer 15. There is. Therefore, the distance D1 between the inner peripheral edge portion 15 of the lower layer 15 and the intermediate layer 16 in the axial direction is narrower than the distance D2 between the outer peripheral edge portion 15 and the intermediate layer 16 of the lower layer 15. In other words, the height in the axial direction in the space formed by the lower layer 15 and the intermediate layer 16 gradually increases from the inside to the outside in the radial direction. The second folded-back portion 19 corresponds to the folded-back portion of the second layer and the third layer of the present invention, and the tip portion 20 of the second folded-back portion 19 corresponds to the protective portion of the present invention. ..

ついで、上記構成の缶蓋１の作用について説明する。図示しない缶容器を開封するために、タブ６の指掛け部８に指を掛けてタブ６を引き起こすと、開口片５のうち、スコア線４よりも内側の部分に押し下げ部９が押し当てられる。そして、押し下げ部９を支点とし、リベット部１０を作用点とした第２種のテコ作用によってリベット部１０の近傍に形成された補助スコア線１３に破断が生じる。タブ６を更に引き起こすと、リベット部１０を支点とし、押し下げ部９を作用点とした第１種のテコ作用が生じ、押し下げ部９の近傍のスコア線４に破断が生じると共に、開口片５の一部が押し下げ部９によって缶容器の内側に折り曲げられる。これに続いて、軸線方向で缶蓋１の上側にタブ６を持ち上げると、スコア線４に沿って破断が次第に進行し、ついには缶蓋１から開口片５が切り離される。こうして缶蓋１のほぼ全面が開封される。 Next, the action of the can lid 1 having the above configuration will be described. When a finger is hung on the finger hook 8 of the tab 6 to raise the tab 6 in order to open the can container (not shown), the push-down portion 9 is pressed against the portion of the opening piece 5 inside the score line 4. Then, the auxiliary score line 13 formed in the vicinity of the rivet portion 10 is broken by the second type of lever action with the push-down portion 9 as the fulcrum and the rivet portion 10 as the action point. When the tab 6 is further raised, the first type of lever action occurs with the rivet portion 10 as the fulcrum and the push-down portion 9 as the action point, the score line 4 in the vicinity of the push-down portion 9 is broken, and the opening piece 5 A part is bent inside the can container by the push-down portion 9. Subsequently, when the tab 6 is lifted above the can lid 1 in the axial direction, the break gradually progresses along the score line 4, and finally the opening piece 5 is separated from the can lid 1. In this way, almost the entire surface of the can lid 1 is opened.

このように、この発明の缶蓋１では、スコア線４の溝幅を広げるようにスコア線４を変形させてある状態からスコア線４に破断を生じさせて缶蓋１を開封する。そのため、従来に比較して小さい荷重でスコア線４を破断させることができる。つまり、開封しやすく、いわゆる開蓋性を向上させた缶蓋１を得ることができる。また、軸線方向において、下層１５の内周縁部１５Ａは下層１５の外周縁部１５Ｂよりも中間層１６に接近させて構成されている。そのため、缶蓋１を開封すると、上記の先端部２０は、開封によって生じた下層１５の内周縁部１５Ａに形成された破断端に被さった状態になる。先端部２０がいわゆる保護部として機能するため、上記の破断端に直接、指などが触れにくくなり、開封後の缶容器の安全性が向上する。なお、上記の破断端に指が触れるとしても、それらは互いに接近して設けられているため、指との接触面積が増大することとなり、破断端による指などの損傷を抑制できる。 As described above, in the can lid 1 of the present invention, the score line 4 is broken from the state in which the score line 4 is deformed so as to widen the groove width of the score line 4, and the can lid 1 is opened. Therefore, the score line 4 can be broken with a smaller load than in the conventional case. That is, it is possible to obtain a can lid 1 that is easy to open and has improved so-called openability. Further, in the axial direction, the inner peripheral edge portion 15A of the lower layer 15 is configured to be closer to the intermediate layer 16 than the outer peripheral edge portion 15B of the lower layer 15. Therefore, when the can lid 1 is opened, the tip portion 20 is in a state of covering the broken end formed on the inner peripheral edge portion 15A of the lower layer 15 generated by the opening. Since the tip portion 20 functions as a so-called protective portion, it becomes difficult for a finger or the like to directly touch the broken end, and the safety of the can container after opening is improved. Even if a finger touches the above-mentioned fractured end, since they are provided close to each other, the contact area with the finger increases, and damage to the finger or the like due to the fractured end can be suppressed.

さらに、上記構成の缶蓋１では、図３に示すように、缶蓋１の軸線方向で、中間層１６と下層１５の内周縁部１５Ａとの間隔Ｄ１が、中間層１６と下層１５の外周縁部１５Ｂとの間隔Ｄ２よりも狭くなるように構成されている。換言すると、軸線方向における下層１５と中間層１６との間隔は、半径方向で内側から外側に向かって次第に広くなっている。そのため、先端部２０による破断端の保護性を損なわない範囲で、第１折り返し部１８の曲率半径と第２折り返し部１９の曲率半径とをそれぞれ大きくすることができる。その結果、金属板や合成樹脂被膜の変形量やひずみを小さくできるので、金属板や合成樹脂被膜の割れや亀裂などの欠損が生じにくくなり、缶蓋１の内面品位が向上する。また、金属板の露出が抑制されるから缶蓋１の耐食性を向上できる。なお、スコア線４の破断端のうち、開口片５に形成される破断端は開口片５と共に取り除かれるため、特には問題とならない。 Further, in the can lid 1 having the above configuration, as shown in FIG. 3, the distance D1 between the intermediate layer 16 and the inner peripheral edge portion 15A of the lower layer 15 is set outside the intermediate layer 16 and the lower layer 15 in the axial direction of the can lid 1. It is configured to be narrower than the distance D2 from the peripheral edge portion 15B. In other words, the distance between the lower layer 15 and the intermediate layer 16 in the axial direction gradually increases from the inside to the outside in the radial direction. Therefore, the radius of curvature of the first folded portion 18 and the radius of curvature of the second folded portion 19 can be increased as long as the protection of the fractured end by the tip portion 20 is not impaired. As a result, the amount of deformation and strain of the metal plate and the synthetic resin coating can be reduced, so that cracks and cracks in the metal plate and the synthetic resin coating are less likely to occur, and the inner surface quality of the can lid 1 is improved. Further, since the exposure of the metal plate is suppressed, the corrosion resistance of the can lid 1 can be improved. Of the broken ends of the score line 4, the broken ends formed in the opening piece 5 are removed together with the opening piece 5, so that there is no particular problem.

この発明は上述した実施形態に限定されないのであって、この発明の目的を達成する範囲で適宜に変更してよい。例えば、半径方向で開口片５の外周縁部に、開口片５に形成されるスコア線４の破断端を保護する重層部１４が形成されていてもよい。その場合には、半径方向で第２層と第３層との折り返し部の先端部が、第１層におけるスコア線４側の端部と半径方向で同じ位置、もしくは、半径方向でスコア線４より僅かに内側に位置していればよい。第２層と第３層との折り返し部の先端部は、要は、缶蓋１を開封することによって第１層におけるスコア線４側の端部に形成される破断端に、被さった状態になるように構成されていればよい。 The present invention is not limited to the above-described embodiment, and may be appropriately modified as long as the object of the present invention is achieved. For example, a layered portion 14 that protects the broken end of the score line 4 formed in the opening piece 5 may be formed on the outer peripheral edge portion of the opening piece 5 in the radial direction. In that case, the tip of the folded portion of the second layer and the third layer in the radial direction is at the same position in the radial direction as the end on the score line 4 side in the first layer, or the score line 4 in the radial direction. It suffices to be located slightly inward. The tip of the folded portion of the second layer and the third layer is, in short, covered with the fractured end formed at the end of the first layer on the score line 4 side by opening the can lid 1. It suffices if it is configured to be.

１…缶蓋、 ２…パネル部、 ４…スコア線、 ５…開口片（内側パネル部）、 ６…タブ、 ７…外側パネル部、 １４…重層部、 １５…下層（第１層）、 １５Ａ…下層の内周縁部（第１層におけるスコア線側の端部）、 １５Ｂ…下層の外周縁部（第１層におけるスコア線とは反対側の端部）、 １６…中間層（第２層）、 １７…上層（第３層）、 １９…第２折り返し部（半径方向で第２層と第３層との折り返し部）、 ２０…第２折り返し部の先端部、 Ｄ１…軸線方向で下層の内周縁部と中間層の内周縁部との間隔（軸線方向で第２層と第１層におけるスコア線側の端部との間隔）、 Ｄ２…軸線方向で下層の外周縁部と中間層の外周縁部との間隔（軸線方向で第２層と第１層におけるスコア線とは反対側の端部との間隔）。 1 ... can lid, 2 ... panel part, 4 ... score line, 5 ... opening piece (inner panel part), 6 ... tab, 7 ... outer panel part, 14 ... layered part, 15 ... lower layer (first layer), 15A ... Inner peripheral edge of the lower layer (end on the score line side in the first layer), 15B ... Outer peripheral edge of the lower layer (end opposite to the score line in the first layer), 16 ... Intermediate layer (second layer) ), 17 ... Upper layer (third layer), 19 ... Second folded part (folded part between the second layer and the third layer in the radial direction), 20 ... The tip of the second folded part, D1 ... Lower layer in the axial direction Distance between the inner peripheral edge of the inner peripheral edge of the middle layer and the inner peripheral edge of the intermediate layer (distance between the outer peripheral edge of the second layer and the end of the first layer on the score line side in the axial direction), D2 ... Distance from the outer peripheral edge of the layer (distance between the second layer and the end on the first layer opposite to the score line in the axial direction).

Claims (4)

円板状のパネル部と、
前記パネル部の半径方向で前記パネル部の周縁部よりも内側に前記周縁部に沿って形成された環状のスコア線と、
前記スコア線の内側の部分である内側パネル部と、
前記スコア線の外側の部分である外側パネル部と、
前記内側パネル部に固着された開封操作用のタブと、
前記内側パネル部と前記外側パネル部との少なくともいずれか一方に、前記スコア線と隣接しかつ前記パネル部を折り畳んで形成された重層部とを備え、
前記重層部は、前記スコア線から前記半径方向に延びる第１層と、前記第１層を前記半径方向で前記スコア線側に折り返して形成された第２層と、前記第２層を前記半径方向で前記スコア線とは反対側に折り返して形成された第３層とを有している缶蓋において、
前記第２層と前記第３層との折り返し部の先端部が、前記缶蓋を開封することによって前記第１層に形成された破断端の保護部を成しており、かつ、
前記缶蓋の軸線方向で、前記第２層と前記第１層における前記スコア線側の端部との間隔が、前記第２層と前記第１層における前記スコア線とは反対側の端部との間隔よりも狭い
ことを特徴とする缶蓋。 With a disk-shaped panel
An annular score line formed along the peripheral edge of the panel in the radial direction of the panel and inside the peripheral edge of the panel.
The inner panel part, which is the inner part of the score line,
The outer panel part, which is the outer part of the score line,
A tab for opening operation fixed to the inner panel and
At least one of the inner panel portion and the outer panel portion is provided with a multi-layer portion adjacent to the score line and formed by folding the panel portion.
The layered portion includes a first layer extending from the score line in the radial direction, a second layer formed by folding the first layer toward the score line side in the radial direction, and the second layer having the radius. In a can lid having a third layer formed by folding back in the direction opposite to the score line.
The tip of the folded portion of the second layer and the third layer forms a protective portion of a broken end formed in the first layer by opening the can lid, and also
In the axial direction of the can lid, the distance between the second layer and the end of the first layer on the score line side is the end of the second layer and the first layer opposite to the score line. A can lid characterized by being narrower than the distance between the can lid. 請求項１に記載の缶蓋において、
前記重層部は、前記外側パネル部に形成されている
ことを特徴とする缶蓋。 In the can lid according to claim 1,
The layered portion is a can lid, which is formed on the outer panel portion. 請求項１または２に記載の缶蓋において、
前記外側パネル部と前記内側パネル部とは、前記スコア線を境界として屈曲して形成されている
ことを特徴とする缶蓋。 In the can lid according to claim 1 or 2.
A can lid characterized in that the outer panel portion and the inner panel portion are formed by bending with the score line as a boundary. 請求項１ないし３のいずれか一項に記載の缶蓋において、
前記缶蓋は、両面のうちの少なくともいずれか一方の面に耐食性のある合成樹脂被膜が形成された金属板によって形成されており、
前記合成樹脂被膜は塗膜によって形成されている
ことを特徴とする缶蓋。 In the can lid according to any one of claims 1 to 3.
The can lid is formed of a metal plate having a corrosion-resistant synthetic resin coating formed on at least one of both sides.
A can lid characterized in that the synthetic resin film is formed of a coating film.
JP2019031435A 2019-02-25 2019-02-25 Can lid Pending JP2020132252A (en)

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JP2019031435A JP2020132252A (en) 2019-02-25 2019-02-25 Can lid
CN202080010462.5A CN113329944A (en) 2019-02-25 2020-01-30 Can lid
PCT/JP2020/003448 WO2020174997A1 (en) 2019-02-25 2020-01-30 Can lid
TW109105814A TW202031559A (en) 2019-02-25 2020-02-24 Can lid

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CN113928681A (en) * 2021-10-28 2022-01-14 珠海博瑞特包装科技有限公司 Double-edge-protection full-open cover

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JPS60204452A (en) * 1984-03-30 1985-10-16 谷内　啓二 Vessel cover with safe opening edge
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JPH01182248A (en) * 1987-12-25 1989-07-20 Toyo Seikan Kaisha Ltd Easy-opening can lid and its manufacture
JPH0455941B2 (en) * 1988-12-27 1992-09-04 Keiji Yanai
JP2006264707A (en) * 2005-03-22 2006-10-05 Daiwa Can Co Ltd Easily-openable can lid
JP2016078923A (en) * 2014-10-21 2016-05-16 東洋製罐株式会社 Can-top

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JPS54128869U (en) * 1978-02-16 1979-09-07
JPS60204452A (en) * 1984-03-30 1985-10-16 谷内　啓二 Vessel cover with safe opening edge
JPS61273344A (en) * 1985-05-22 1986-12-03 東洋製罐株式会社 Easy-open cover having excellent opening property and corrosion resistance
JPH01182248A (en) * 1987-12-25 1989-07-20 Toyo Seikan Kaisha Ltd Easy-opening can lid and its manufacture
JPH0455941B2 (en) * 1988-12-27 1992-09-04 Keiji Yanai
JP2006264707A (en) * 2005-03-22 2006-10-05 Daiwa Can Co Ltd Easily-openable can lid
JP2016078923A (en) * 2014-10-21 2016-05-16 東洋製罐株式会社 Can-top

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