EP4180349A1 - Can lid and manufacturing method therefor - Google Patents

Can lid and manufacturing method therefor Download PDF

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Publication number
EP4180349A1
EP4180349A1 EP21838754.6A EP21838754A EP4180349A1 EP 4180349 A1 EP4180349 A1 EP 4180349A1 EP 21838754 A EP21838754 A EP 21838754A EP 4180349 A1 EP4180349 A1 EP 4180349A1
Authority
EP
European Patent Office
Prior art keywords
plate thickness
lid
panel
chuck wall
tool
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
EP21838754.6A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP4180349A4 (en
Inventor
Tomomi Kobayashi
Yuki Yamamura
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.)
Toyo Seikan Group Holdings Ltd
Original Assignee
Toyo Seikan Group Holdings 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 Toyo Seikan Group Holdings Ltd filed Critical Toyo Seikan Group Holdings Ltd
Publication of EP4180349A1 publication Critical patent/EP4180349A1/en
Publication of EP4180349A4 publication Critical patent/EP4180349A4/en
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • B65D43/00—Lids or covers for rigid or semi-rigid containers
    • 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
    • B65D7/42—Details of metal walls
    • B65D7/44—Reinforcing or strengthening parts or members
    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/28—Deep-drawing of cylindrical articles using consecutive dies

Definitions

  • the present invention relates to a can lid and a manufacturing method therefor.
  • a metal can for filling a beverage or the like therein hermetically encloses contents by seaming a can lid to an opening end of a bottomed cylindrical can barrel in a case of a two-piece can.
  • the one with a stay-on tab type opening tab has been generally adopted.
  • the can lid is seamed to the opening end of the can barrel after filling contents in the can barrel. For this reason, generally, the can lid is supplied to a filling destination in a stacked state separately from the can barrel.
  • the can lid has a center panel part to which an opening tab is mounted, and has, on a surrounding side thereof, an annular groove part into which an outer edge projection of an inner tool (seaming chuck) of a seamer is inserted. Further, the can lid has a curl part to be seamed to the opening end of the can barrel at an outer circumference of the annular groove part (see, for example, PTL 1 described below).
  • a panel wall part is shaped as a wall part in a groove at the annular groove part
  • a chuck wall radius part is shaped at a portion extending from the wall part in the groove to an wall part outside the groove at the annular groove part
  • a chuck wall part is shaped at a portion extending from the wall part outside the groove to the curl part.
  • a metal can has been demanded to be reduced in plate thickness as much as possible in order to save material resources and reduce a weight thereof.
  • strength pressure resistance
  • the present invention has been proposed in order to address such a problem. It is an object of the present invention to provide a can lid with a high pressure resistance while meeting a demand for a smaller plate thickness on the basis of a stricter study on the plate thickness, or the like.
  • a can lid in accordance with the present invention includes the following configuration.
  • a can lid having a center panel part, a panel wall part, a chuck wall radius part, a chuck wall part, and a curl part, characterized in that t2 > t1 holds, where t1 represents a plate thickness of the center panel part, and t2 represents a plate thickness of a bottom end of the panel wall part.
  • a can lid having such a feature can provide the can lid with a high pressure resistance while meeting a demand of more reducing a plate thickness, and can attain an improvement of the pressure resistance at the can lid.
  • a can lid 1 in accordance with an embodiment of the present invention has a center panel part 1A, a panel wall part 1B, a chuck wall radius part 1C, a chuck wall part 1D, and a curl part 1E.
  • the center panel part 1A is a generally flat portion of a central portion of the can lid 1, and is provided with a score or an opening tab in a case of a stay-on type.
  • a curve portion r1 At an outer edge of the center panel part 1A, there is a curve portion r1. A portion extending downward linearly from a terminal of the curve portion r1 is the panel wall part 1B. Then, a portion which is a curve portion r2 to be shaped under the panel wall part 1B, and includes the bottom of an annular groove part Cs to be shaped at an outer circumference of the center panel part 1A is the chuck wall radius part 1C. Further, a linear or partially curved potion extending upward from an outer upper end of the chuck wall radius part 1C, a portion from an outer wall of the annular groove part Cs further to a front of a curve of the curl part 1E, is the chuck wall part 1D.
  • t2 > t1 holds, where t1 represents a plate thickness of the center panel part 1A, and t2 represents a plate thickness of a bottom end of the panel wall part 1B.
  • the plate thickness t1 of the center panel part 1A is a value close to an original plate thickness of a material to be processed before shape processing of the can lid 1.
  • the bottom end of the panel wall part 1B is a boundary portion between the chuck wall radius part 1C and the curve portion r2.
  • the plate thickness t2 of the bottom end of the panel wall part 1B is made larger than the plate thickness t1. This enables the can lid 1 with a still higher pressure resistance in addition to a conventional shape design.
  • the plate thickness t2 By making the plate thickness t2 larger than 1.01 times the plate thickness t1 (t2 > 1.01 * t1), it is possible to obtain a can lid 1 with a still higher pressure resistance.
  • the can lid 1 by making a plate thickness t3, where t3 represents a plate thickness of the chuck wall radius part 1C, larger than the plate thickness t1, and preferably making the plate thickness t3 larger than 1.01 times the plate thickness t1 (t3 > 1.01 * t1), it is possible to obtain a can lid 1 with a high pressure resistance.
  • t1 > t4 holds, where t4 represents a plate thickness of a middle part of the chuck wall part 1D, namely, a plate thickness at a position one half a substantial height of the can lid as shown in Fig. 1 . Accordingly, by making the middle part of the chuck wall part 1D thin, relatively less affected by a pressure resistance, it is possible to reduce a weight of the can lid 1 while keeping a prescribed pressure resistance.
  • the can lid 1 by partially increasing the plate thicknesses of the panel wall part 1B and the chuck wall radius part 1C of the annular groove part Cs to be shaped at the outer circumference of the center panel part 1A, it is possible to further increase a pressure resistance in addition to the rationalization of the conventional shape design of the annular groove part Cs and the portion extending therefrom to the curl part 1E.
  • the plate thicknesses of the panel wall part 1B and the chuck wall radius part 1C of the annular groove part Cs to be shaped at the outer circumference of the center panel part 1A can be made larger than the original plate thickness of the material to be processed (the plate thickness t1 of the center panel part 1A). For this reason, it becomes possible to reduce the original plate thickness of the material to be processed as much as possible, so that saving of material resources and weight reduction can be effectively implemented.
  • the manufacturing process of the can lid 1 has a blank stamping step S1, an outer circumferential part drawing step S2, a panel part drawing step S3, and a panel part pressing down step S4 as shown in Fig. 2 .
  • a shape body M1 shown in Fig. 3 at (a) is shaped by the step S1 to the step S3, and in the step S4, the shape body M1 is subjected to press down processing of a panel part p (a processed part to be processed into the center panel part 1A).
  • shape bodies M2 and M3 shown in Fig. 3 at (b) and (c) are shaped, finally resulting in the can lid 1 shown in Fig. 3 at (d).
  • the upper tool U includes an inner tool U1 and an outer tool U2.
  • the lower tool L includes a fixed inner tool L1, a movable inner tool L2, a movable outer tool L3, and a fixed outer tool L4.
  • a material to be processed M is inserted into between the upper tool U and the lower tool L.
  • stamping by a processing surface a of the outer tool U2 and a processing surface b of the fixed outer tool L4 due to descent of the upper tool U shapes a shape body M01 in a disk shape.
  • descent of the upper tool U causes the lower surface c of the outer tool U2 to press down the movable outer tool L3, so that a drawing processing on a shape body M03 progresses by a processing surface f of the outer tool U2 and a processing surface g of the movable inner tool L2 as shown in Fig. 5 at (b).
  • center panel part 1A is shaped in the panel part p sandwiched between the lower surface of the inner tool U1 and the upper surface of the fixed inner tool L1. Subsequently, as shown in Fig. 8 at (b), the upper tool U and the lower tool L are disengaged, and a shaped product of the can lid 1 is taken out.
  • the outermost circumferential part of the shaped product of the can lid 1 is curled into a shape suitable for seaming by a known method, and a sealing compound is applied to an inner surface portion thereof. Further, according to the intended purpose, the panel part is subjected to a step such as rivet processing, score processing, or caulking of a tab, resulting in completion of a can lid.
  • the panel wall part 1B and the chuck wall radius part 1C are shaped by pressing down the panel part p which is the processed part to be processed into the center panel part 1A and the processed part to be processed into the chuck wall radius part 1C is forced into the groove part j. For this reason, a shape process is accomplished without direct touch between the processing surface of the process tool and the panel wall part 1B and the chuck wall radius part 1C. Further, pressing down of the panel part p causes the processed parts to be processed into the panel wall part 1B and the chuck wall radius part 1C to be applied with a compression stress in a direction orthogonal to a plate thickness direction. Accordingly, such plastic deformation as to result in an increase in plate thickness is performed.
  • a die obtained by providing a fixed inner tool L10 with an ironing convex part k1 is used. Then, the shape body is ironed between an inner processing surface k2 of the outer tool U2 of the upper tool U and the ironing convex part k1. As a result, at the panel part drawing step S3, ironing can be added to the middle part of the chuck wall part 1D.
  • ironing when ironing is added to a part (particularly, a central part) of the chuck wall part 1D, a plate thickness of a part of the chuck wall part 1D can be reduced. As a result of this, it is possible to effectively enhance the pressure resistance of the can lid 1 while satisfying a demand for saving material resources and reduction of the weight.
  • the manufacturing process is a method for performing from blank stamping to the shaped product of the can lid 1 by one stroke in upper and lower dies.
  • the series of steps can also be performed in a plurality of stages using different dies.
  • an action of the compression stress in the direction orthogonal to the plate thickness direction due to pressing down of the panel part p in the panel part pressing down step S4 is maximized in a state depicted in Fig. 8 at (a), namely, in a state in which the processed part is forced into the bottom of the groove part j.
  • a following control becomes possible: panel pressing down is divided into a plurality of stages; and at each stage, the panel pressing down is performed with the die including the groove bottom; as a result, the region to be increased in plate thickness is allowed to be wider.
  • the can lid 1 was shaped with the manufacturing process.
  • a plate thickness of each part was measured.
  • the example is shown in Table 1 below.
  • t5 is a plate thickness of the upper end of the panel wall part 1B.
  • the plate thickness t2 is larger than 1.01 times the plate thickness t1.
  • the plate thickness t2 and the plate thickness t3 are larger than 1.01 times the plate thickness t1.
  • the plate thickness t4 is reduced by ironing, so that the metal portion of the processed part to be processed into the panel wall 1B and the chuck wall radius part 1C can be allocated as that much.
  • the action of the compression stress in the direction orthogonal to the plate thickness direction due to pressing down of the panel part p can further increase the plate thicknesses t2 and t3.
  • Such adjustment of the plate thickness could increase the pressure resistance as compared with Comparative Example accomplished by the conventional method in PTL 2.
  • the can lid 1 in accordance with the embodiment of the present invention, it is possible to obtain the can lid 1 with a high pressure resistance while satisfying a demand for more reducing the plate thickness, and it becomes possible to improve the pressure resistance in the can lid 1.
  • Canned goods obtained by seaming the can lid 1 to the can barrel can reduce a weight of a metal can relative to a content weight while ensuring the high pressure resistance.
  • Fig. 11 is a view showing the measurement position of the plate thickness of the middle part of the chuck wall part, where Fig. 11 at (a) is a view showing the measurement position of another embodiment of Fig. 10 , and Fig. 11 at (b) is a view showing the measurement position of an embodiment.
  • t1 > t4 holds, where t4 represents the plate thickness of the middle part of the chuck wall part 1D, namely, the plate thickness at the position at a height one half the substantial height of the can lid. Also in another embodiment, by making thin the middle part of the chuck wall part 1D relatively less affected by the pressure resistance, it is possible to reduce the weight of the can lid 1 while keeping a prescribed pressure resistance.
  • the other embodiment of Fig. 11 at (a) and the embodiment of Fig. 11 at (b) show partial cross sections after seaming the portion of the can lid 1 of Fig. 10 and the portion of the can lid 1 of Fig. 1 to their can barrels, respectively. Even the comparison between state of Figs. 10 and 1 before seaming and states of Fig. 11 after seaming does not indicate a change in substantial height between before and after seaming of the can lid 1. Accordingly, the plate thicknesses t4 of the other embodiment Fig. 11 at (a) and the embodiment Fig. 11 at (b) are roughly at the same position.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
EP21838754.6A 2020-07-10 2021-06-08 CAN LID AND CORRESPONDING MANUFACTURING METHOD Pending EP4180349A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020119375A JP2022016093A (ja) 2020-07-10 2020-07-10 缶蓋及びその製造方法
PCT/JP2021/021682 WO2022009585A1 (ja) 2020-07-10 2021-06-08 缶蓋及びその製造方法

Publications (2)

Publication Number Publication Date
EP4180349A1 true EP4180349A1 (en) 2023-05-17
EP4180349A4 EP4180349A4 (en) 2024-06-26

Family

ID=79552418

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21838754.6A Pending EP4180349A4 (en) 2020-07-10 2021-06-08 CAN LID AND CORRESPONDING MANUFACTURING METHOD

Country Status (6)

Country Link
US (1) US20230256500A1 (ja)
EP (1) EP4180349A4 (ja)
JP (1) JP2022016093A (ja)
CN (1) CN115768694A (ja)
TW (1) TW202216543A (ja)
WO (1) WO2022009585A1 (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024154371A1 (ja) * 2023-01-18 2024-07-25 拓郎 新宮領 缶蓋シェルとその製造方法並びに成形装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03275443A (ja) 1990-03-10 1991-12-06 Toyo Seikan Kaisha Ltd 耐圧缶用蓋の製造方法および耐圧缶用蓋
WO2012039433A1 (ja) 2010-09-22 2012-03-29 ユニバーサル製缶株式会社 缶蓋
US9573183B2 (en) * 2012-05-18 2017-02-21 Stolle Machinery Company, Llc Container, and selectively formed shell, and tooling and associated method for providing same
JP6988136B2 (ja) * 2017-04-03 2022-01-05 東洋製罐株式会社 シェルの製造方法及び缶蓋の製造方法

Also Published As

Publication number Publication date
WO2022009585A1 (ja) 2022-01-13
US20230256500A1 (en) 2023-08-17
TW202216543A (zh) 2022-05-01
EP4180349A4 (en) 2024-06-26
JP2022016093A (ja) 2022-01-21
CN115768694A (zh) 2023-03-07

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