US20190359398A1 - Container lid comprising metal body and synthetic resin liner - Google Patents

Container lid comprising metal body and synthetic resin liner Download PDF

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Publication number
US20190359398A1
US20190359398A1 US16/485,004 US201816485004A US2019359398A1 US 20190359398 A1 US20190359398 A1 US 20190359398A1 US 201816485004 A US201816485004 A US 201816485004A US 2019359398 A1 US2019359398 A1 US 2019359398A1
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US
United States
Prior art keywords
layer
peripheral edge
outer peripheral
central portion
region
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.)
Abandoned
Application number
US16/485,004
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English (en)
Inventor
Shunpei SHIMOJI
Hidenori Kondo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Closures Co Ltd
Original Assignee
Nippon Closures 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 Nippon Closures Co Ltd filed Critical Nippon Closures Co Ltd
Assigned to NIPPON CLOSURES CO., LTD. reassignment NIPPON CLOSURES CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KONDO, HIDENORI, SHIMOJI, Shunpei
Publication of US20190359398A1 publication Critical patent/US20190359398A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • B65D53/00—Sealing or packing elements; Sealings formed by liquid or plastics material
    • B65D53/04—Discs
    • 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
    • B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
    • B65D41/32—Caps or cap-like covers with lines of weakness, tearing-strips, tags, or like opening or removal devices, e.g. to facilitate formation of pouring openings
    • B65D41/34—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt

Definitions

  • This invention relates to a container lid comprising a body made of a thin metal plate, the body having a circular top panel wall, and a cylindrical skirt wall extending downwardly from the peripheral edge of the top panel wall; and a synthetic resin liner disposed on the inner surface of the top panel wall of the body.
  • Containers are formed from thin metal plates such as aluminum-based alloys.
  • an outward curl is formed in an upper end part of a cylindrical mouth-neck section, and an internal thread and a locking jaw located below it are formed on the outer peripheral surface of the mouth-neck section.
  • Patent Documents 1 and 2 shown below disclose container lids each comprising a body made of a thin metal plate, the body having a circular top panel wall, and a cylindrical skirt wall extending downwardly from the peripheral edge of the top panel wall; and a synthetic resin liner disposed on the inner surface of the top panel wall of the body.
  • An annular concavity is formed in an upper end part of the skirt wall of the body.
  • the liner is composed of a first layer formed by press-molding a rigid synthetic resin material supplied to the inner surface of the top panel wall, and a second layer formed by press-molding a flexible 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 panel wall of the body, and a toroidal outer peripheral edge portion extending along an outer peripheral edge part of the top panel wall of the body and along the upper end part of the skirt wall.
  • the second layer of the liner is laminated to the central portion of the first layer.
  • Patent Document 1 JP-A-2015-3325
  • Patent Document 2 JP-A-2016-26961
  • the conventional container lid of the above-described form has been found to pose the following problems to be solved: (1) When the second layer is press-molded, it is highly likely that a radially inner region in the outer peripheral edge portion of the first layer, namely a part in the outer peripheral edge portion which is adjacent to the central portion, will be damaged. (2) When the second layer is to be press-molded, the synthetic resin for forming the second layer fails to flow sufficiently smoothly and as required, so that the second layer of a required shape may fail to be press-molded.
  • the present invention has been accomplished in the light of the above facts. Its first challenge is to provide a novel and improved container lid which is maximally freed from a situation where the radially inner region in the outer peripheral edge portion of the first layer is damaged when the second layer is press-molded, without other problems, such as a considerable increase in the consumption of the material used, being raised.
  • a second challenge facing the present invention is to provide a novel and improved container lid in which the second layer of the required shape can be press-molded reliably.
  • the present inventors Upon in-depth studies and experiments, the present inventors have recognized the following cause of the situation where the radially inner region of the outer peripheral edge portion of the first layer is damaged when the second layer is press-molded:
  • the thickness of the radially inner region of the outer peripheral edge portion which should normally be the same as the thickness of a radially outer region of the central portion adjacent thereto, is actually too small.
  • the radially inner region of the outer peripheral edge portion of the first layer does not have sufficient resistance against contact under a considerable pressing force exerted by a mold component for press-molding the second layer.
  • the inventors have found that the first challenge can be solved by making the thickness of the radially inner region of the outer peripheral edge portion of the first layer larger than the thickness of the radially outer region of the central portion to render a step existent at a boundary between the central portion and the outer peripheral edge portion (the first challenge can also be solved even if no step is made present by similarly increasing the thickness the radially outer region of the central portion; this measure, however, will increase the amount of the material necessary for formation of the first layer).
  • the present inventors have found, upon in-depth studies and experiments, that when a toroidal thickness varying region whose thickness gradually decreases radially outwardly is rendered present in the central portion of the first layer, the synthetic resin material for forming the second layer can be flowed sufficiently smoothly during press molding of the second layer.
  • a container lid for solving the above first challenge, a container lid comprising a body made of a thin metal plate, the body having a circular top panel wall, and a cylindrical skirt wall extending downwardly from the peripheral edge of the top panel wall; and a synthetic resin liner disposed on the inner surface of the top panel wall of the body,
  • the liner being composed of a first layer formed by press-molding a rigid synthetic resin material supplied to the inner surface of the top panel wall, and a second layer formed by press-molding a flexible synthetic resin material supplied to the lower surface of the first layer,
  • the first layer of the liner having a circular central portion extending along the inner surface of the top panel wall of the body; and a toroidal outer peripheral edge portion extending along the inner surface of an outer peripheral edge part of the top panel wall of the body and along the inner surface of an upper end part of the skirt wall, and
  • the second layer of the liner being laminated to the central portion of the first layer
  • the wall thickness of a radially inner region of the outer peripheral edge portion of the first layer of the liner is larger than the wall thickness of a radially outer region of the central portion of the first layer, and a step is present at a boundary between the central portion and the outer peripheral edge portion.
  • a container lid for solving the above second challenge, a container lid comprising a body made of a thin metal plate, the body having a circular top panel wall, and a cylindrical skirt wall extending downwardly from the peripheral edge of the top panel wall; and a synthetic resin liner disposed on the inner surface of the top panel wall of the body,
  • the liner being composed of a first layer formed by press-molding a rigid synthetic resin material supplied to the inner surface of the top panel wall; and a second layer formed by press-molding a flexible synthetic resin material supplied to the lower surface of the first layer,
  • the first layer of the liner having a circular central portion extending along the inner surface of the top panel wall of the body; and a toroidal outer peripheral edge portion extending along the inner surface of an outer peripheral edge part of the top panel wall of the body and along the inner surface of an upper end part of the skirt wall, and
  • the second layer of the liner being laminated to the central portion of the first layer
  • the step preferably measures 0.05 to 0.40 mm.
  • the second layer has a circular thin-walled central portion, and a toroidal thick-walled outer peripheral edge portion; an annular protrusion protruding downward is present in a radially inner region of the thick-walled outer peripheral edge portion; and the outer peripheral edge of the thickness varying region of the first layer is located radially inwardly of the inner peripheral edge of the annular protrusion.
  • the thickness varying region of the first layer is located opposite a radially outer region of the thin-walled central portion of the second layer; and the thickness of the radially outer region of the thin-walled central portion of the second layer gradually increases radially outwardly in accordance with thickness variations of the thickness varying region of the first layer.
  • the thickness varying region desirably inclines at an inclination angle of 0.5 to 3.0 degrees relative to the horizontal.
  • the container lid is applied to a container made of a thin metal plate, the container having an outward curl formed at the leading end of a mouth-neck section thereof, an outer peripheral surface of the annular protrusion of the second layer of the liner is brought into intimate contact with an upper end part of the inner peripheral surface of the outward curl; and a lower surface of a radially outer region of the thick-walled outer peripheral edge portion located radially outwardly of the annular projection is brought into intimate contact with an upper surface to an outer peripheral surface of the outward curl.
  • upper and lower used herein and in the “Claims” refer, respectively, to the upper and lower positions in the upright state of the container lid (namely, each of the states illustrated in FIGS. 1 to 3 ).
  • the wall thickness of the radially inner region of the outer peripheral edge portion of the first layer of the liner is larger than the wall thickness of the radially outer region of the central portion, and the step is present at the boundary between the central portion and the outer peripheral edge portion.
  • the wall thickness of the radially inner region of the outer peripheral edge portion of the first layer of the liner can be rendered a sufficient thickness, without an excessive increase in the amount of the material necessary for molding of the first layer.
  • the toroidal thickness varying region whose thickness gradually decreases radially outwardly is present in the central portion of the first layer.
  • the flow of the material during press molding of the second layer is promoted owing to the presence of the thickness varying region.
  • the second layer of the required shape can be press-molded reliably.
  • FIG. 1 is a front view, partly in cross section, showing a preferred embodiment of a container lid configured in accordance with the present invention.
  • FIG. 2 is an enlarged view showing a part of FIG. 1 on an enlarged scale.
  • FIG. 3 is a front view, partly in cross section, showing a state in which the container lid shown in FIG. 1 is mounted on a mouth-neck section of a container made of a thin plate to seal the mouth-neck section.
  • FIG. 4 is an enlarged view showing a part of FIG. 3 on an enlarged scale.
  • a container lid entirely indicated at 2 which has been configured in accordance with the present invention, comprises a body 4 made of a thin metal plate and a liner 6 made of a synthetic resin.
  • the body 4 which can be formed from a suitable thin metal plate such as a thin plate of an aluminum-based alloy, has a circular top panel wall 8 , and a cylindrical skirt wall 10 extending downwardly from the peripheral edge of the top panel wall 8 .
  • a boundary region between the top panel wall 8 and the skirt wall 10 is in an arcuate shape as viewed in a cross section.
  • An annular concavity 12 continuously extending in a circumferential direction is formed in an upper end part of the skirt wall 10 .
  • a plurality of slits (notches) 14 extending in the circumferential direction are formed at intervals in the circumferential direction.
  • a circumferential breakable line 16 is disposed, whereby the skirt wall 10 is divided into a main portion 18 located above the circumferential breakable line 16 , and a tamper-evident bottom portion 20 located below the circumferential breakable line 16 .
  • the circumferential breakable line 16 in the illustrated embodiment is composed of a plurality of slits 22 extending in the circumferential direction at intervals in the circumferential direction, and a plurality of bridge portions 24 left between these slits 22 .
  • the tamper-evident bottom portion 20 is connected to the main portion 18 via the plurality of bridge portions 24 .
  • the liner 6 is composed of a first layer 26 and a second layer 28 .
  • the first layer 26 is formed by press-molding a synthetic resin material supplied to the inner surface of the top panel wall 8 of the body 4 . More detailedly, the body 4 is held in an inverted state on a rest (not shown), a synthetic resin material in a softened molten state is supplied to the middle of the top panel wall 8 , and a press-molding member (not shown) of a required shape is pressed against the synthetic resin material at a required pressure, whereby the first layer 26 is formed. It is important that the first layer 26 be molded from a rigid synthetic resin excellent in gas barrier properties, such as polyethylene or polypropylene.
  • the first layer 26 is higher in gas barrier properties than the second layer 28 constituting a sealing layer.
  • the second layer 28 is formed by press-molding a synthetic resin material supplied to the lower surface of the first layer 26 . More detailedly, the body 4 having the first layer 26 formed therein is held in an inverted state on the rest (not shown), a synthetic resin material in a softened molten state is supplied to the middle of the first layer 26 , and a press-molding member (not shown) of a required shape is pressed against the synthetic resin material at a required pressure, whereby the second layer 28 is formed. It is important that the second layer 28 be molded from a flexible synthetic resin excellent in sealing properties, such as polyethylene or elastomer.
  • the first layer 26 has a circular central portion 30 extending along the inner surface of the top panel wall 8 of the body 4 , and a toroidal outer peripheral edge portion 32 extending along the inner surface of an outer peripheral edge part of the top panel wall 8 of the body 4 and along the inner surface of an upper end part of the skirt wall 10 . It is important that a toroidal thickness varying region 34 whose thickness gradually decreases radially outwardly (accordingly, its lower surface extends in an upwardly inclined manner toward the outside in the radial direction) be present in the central portion 30 (the outer peripheral edge of the thickness varying region 34 is preferably situated near an annular protrusion 40 (to be described later) of the second layer 28 and radially inwardly thereof).
  • the inclination angle ⁇ of the lower surface of the thickness varying region 34 relative to the horizontal is preferably 0.5 to 3.0 degrees.
  • the wall thickness of a radially inner region of the outer peripheral edge portion 32 of the first layer 26 is larger than the wall thickness of a radially outer region of the central portion 30 , and a step s, which preferably has a dimension of the order of 0.05 to 0.40 mm, is present at a boundary between the central portion 30 and the outer peripheral edge portion 32 .
  • the second layer 28 laminated to the central portion 30 of the first layer 26 has a circular thin-walled central portion 36 , and a toroidal thick-walled outer peripheral edge portion 38 .
  • the annular protrusion 40 protruding downward is present.
  • the wall thickness of the radially inner region of the outer peripheral edge portion 32 of the first layer 26 constituting the liner 6 is larger than the wall thickness of the radially outer region of the central portion 30 , and the step s is present at the boundary between the central portion 30 and the outer peripheral edge portion 32 .
  • the wall thickness of the radially inner region of the outer peripheral edge portion 32 of the first layer 26 is relatively large.
  • the wall thickness of the radially outer region of the central portion 30 of the first layer 26 is relatively small, so that the amount of the synthetic resin material for forming the first layer 26 does not excessively increase.
  • the thickness varying region 34 whose thickness gradually decreases radially outwardly is present in the central portion 30 of the first layer 26 .
  • FIGS. 3 and 4 show a mouth-neck section 42 of a container to which the container lid 2 is applied.
  • the mouth-neck section 42 of the container of a shape well known per se, which can be formed from a suitable thin metal plate such as a chromated thin steel plate, a thin tinplate, or a thin plate of an aluminum-based alloy, is in a nearly cylindrical shape as a whole, and has an outward curl 44 formed in an upper end part whose outer diameter gradually decreases upwardly.
  • An external thread 46 and a locking jaw 48 located below the external thread 46 are formed in an outer peripheral surface of a main part of the mouth-neck section 42 .
  • the container lid 2 In mounting the container lid 2 on the mouth-neck section 42 of the container to seal the mouth-neck section 42 , the container lid 2 is fitted onto the mouth-neck section 42 , and pressed downward to create a state in which the second layer 28 of the liner 6 is brought into intimate contact with the top of the mouth-neck section 42 , more detailedly, a state in which 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-walled outer peripheral edge portion 38 located radially outwardly of the annular protrusion 40 are brought into intimate contact with the upper end of the inner peripheral surface to the upper surface of the outward curl 44 of the mouth-neck section 42 .
  • the main portion 18 of the skirt wall 10 of the body 4 is deformed along the external thread 46 formed in the mouth-neck section 42 of the container to form an internal thread, while a lower end part of the tamper-evident bottom portion 20 in the skirt wall 10 of the body 4 is deformed radially inwardly and locked to the locking jaw 48 in the mouth-neck section 42 of the container.
  • the fingers are hooked onto the skirt wall 8 of the body 4 to rotate the container lid 2 in an opening direction, namely, in a counterclockwise direction as viewed from above in FIG. 3 .
  • the internal thread formed in the main portion 18 of the skirt wall 10 is moved along the external thread 46 of the mouth-neck section 42 , whereupon the container lid 2 is moved upward relative to the mouth-neck section 42 .
  • the tamper-evident bottom portion 20 of the skirt wall 10 whose lower end part has been locked to the locking jaw 48 of the mouth-neck section 42 , is inhibited from moving upward.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
US16/485,004 2017-02-15 2018-02-01 Container lid comprising metal body and synthetic resin liner Abandoned US20190359398A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2017025771A JP7141812B2 (ja) 2017-02-15 2017-02-15 金属製本体及び合成樹脂製ライナーを備えた容器蓋
JP2017-025771 2017-02-15
PCT/JP2018/003432 WO2018150896A1 (ja) 2017-02-15 2018-02-01 金属製本体及び合成樹脂製ライナーを備えた容器蓋

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US20190359398A1 true US20190359398A1 (en) 2019-11-28

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US16/485,004 Abandoned US20190359398A1 (en) 2017-02-15 2018-02-01 Container lid comprising metal body and synthetic resin liner

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US (1) US20190359398A1 (ja)
EP (1) EP3584192B1 (ja)
JP (1) JP7141812B2 (ja)
KR (1) KR102592793B1 (ja)
CN (1) CN110167848B (ja)
WO (1) WO2018150896A1 (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210237943A1 (en) * 2018-10-31 2021-08-05 Daiwa Can Company Cap
US11794450B2 (en) * 2020-12-18 2023-10-24 Altria Client Services Llc Polymer-laminated metal lid

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114423688B (zh) * 2019-09-25 2024-05-28 日本山村硝子株式会社 盖
KR102443711B1 (ko) * 2022-02-07 2022-09-16 세왕금속공업(주) 씰 라이너 분리형 병마개

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JP4829422B2 (ja) * 2001-05-10 2011-12-07 東洋製罐株式会社 滑剤落下防止手段を備えた容器蓋
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
CN101044068B (zh) * 2004-07-30 2011-04-27 希尔甘控股公司 用于容器的pt-封闭装置
WO2006068230A1 (ja) * 2004-12-22 2006-06-29 Universal Can Corporation キャップ材、キャップ付容器、キャップ材の製造方法及びキャップ材の成形装置
JP4960604B2 (ja) * 2005-05-30 2012-06-27 日本クラウンコルク株式会社 酸素吸収性を有する容器蓋
US7946436B2 (en) * 2005-10-10 2011-05-24 Rieke Corporation Beverage container with threaded plastic drinking sleeve
FR2900143B1 (fr) * 2006-04-24 2010-08-13 Alcan Packaging Capsules Procede de capsule et capsule de bouchage correspondante
JP4994172B2 (ja) * 2007-09-26 2012-08-08 日本クラウンコルク株式会社 容器用のキャップ
JP4911792B2 (ja) * 2009-05-23 2012-04-04 ユニバーサル製缶株式会社 ライナー付きキャップ及びキャップ付きボトル
EP2522591A1 (fr) * 2011-05-09 2012-11-14 Amcor Flexibles Capsules France Capsule de bouchage à vis
JP6137958B2 (ja) * 2013-06-19 2017-05-31 ユニバーサル製缶株式会社 ライナ付キャップの製造方法
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JP6626622B2 (ja) 2014-06-27 2019-12-25 日本クロージャー株式会社 金属製キャップとその製造方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210237943A1 (en) * 2018-10-31 2021-08-05 Daiwa Can Company Cap
US11834228B2 (en) * 2018-10-31 2023-12-05 Daiwa Can Company Cap
US11794450B2 (en) * 2020-12-18 2023-10-24 Altria Client Services Llc Polymer-laminated metal lid

Also Published As

Publication number Publication date
EP3584192A4 (en) 2021-02-24
CN110167848A (zh) 2019-08-23
KR20190118550A (ko) 2019-10-18
JP7141812B2 (ja) 2022-09-26
WO2018150896A1 (ja) 2018-08-23
CN110167848B (zh) 2022-02-15
KR102592793B1 (ko) 2023-10-20
EP3584192A1 (en) 2019-12-25
JP2018131234A (ja) 2018-08-23
EP3584192B1 (en) 2022-03-30
JP2021120301A (ja) 2021-08-19

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