US20230256500A1 - Can lid and manufacturing method therefor - Google Patents

Can lid and manufacturing method therefor Download PDF

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Publication number
US20230256500A1
US20230256500A1 US18/014,950 US202118014950A US2023256500A1 US 20230256500 A1 US20230256500 A1 US 20230256500A1 US 202118014950 A US202118014950 A US 202118014950A US 2023256500 A1 US2023256500 A1 US 2023256500A1
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US
United States
Prior art keywords
lid
plate thickness
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
US18/014,950
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English (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
Assigned to TOYO SEIKAN GROUP HOLDINGS, LTD. reassignment TOYO SEIKAN GROUP HOLDINGS, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: YAMAMURA, YUKI, KOBAYASHI, TOMOMI
Publication of US20230256500A1 publication Critical patent/US20230256500A1/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
    • 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
    • B65D17/06—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
    • 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 t 2 >t 1 holds, where t 1 represents a plate thickness of the center panel part, and t 2 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.
  • FIG. 1 is an explanatory view showing a partial cross section of a can lid.
  • FIG. 2 is an explanatory view showing a manufacturing process of a can lid.
  • FIG. 3 is an explanatory view showing a shape body in the manufacturing process ( FIG. 3 at (a) is a shape body shaped by step S 1 to step S 3 , FIG. 3 at (b) and (c) each is a shape body shaped by step S 4 , and FIG. 3 at (d) is a can lid finally obtainable).
  • FIG. 4 is an explanatory view showing a blank stamping step ( FIG. 4 at (a) is before stamping, and FIG. 4 at (b) is after stamping).
  • FIG. 5 is an explanatory view of an outer circumferential part drawing step ( FIG. 5 at (a) is during drawing, and FIG. 5 at (b) is drawing completed).
  • FIG. 6 is an explanatory view of a panel part drawing step ( FIG. 6 at (a) is at the time of start of drawing, and FIG. 6 at (b) is at the time of completion of drawing).
  • FIG. 7 is an explanatory view of a panel part pressing down step ( FIG. 7 at (a) is at the time of start of pressing down, and FIG. 7 at (b) is during pressing down).
  • FIG. 8 is an explanatory view of a panel part pressing down step ( FIG. 8 at (a) is pressing down completed, and FIG. 8 at (b) is shaped product extraction).
  • FIG. 9 is an explanatory view showing an example of addition of ironing at the panel part drawing step.
  • FIG. 10 is an explanatory view showing an example of another shape of an embodiment of the present invention.
  • FIG. 11 is a view showing the measurement position of a plate thickness of the middle part of the chuck wall part
  • FIG. 11 at (a) is a view showing the measurement position of another embodiment of FIG. 10
  • FIG. 11 at (b) is a view showing the measurement position of an embodiment.
  • a can lid 1 in accordance with an embodiment of the present invention has a center panel part 1 A, a panel wall part 1 B, a chuck wall radius part 1 C, a chuck wall part 1 D, and a curl part 1 E.
  • the center panel part 1 A 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 r 1 At an outer edge of the center panel part 1 A, there is a curve portion r 1 .
  • a portion extending downward linearly from a terminal of the curve portion r 1 is the panel wall part 1 B.
  • a portion which is a curve portion r 2 to be shaped under the panel wall part 1 B, and includes the bottom of an annular groove part Cs to be shaped at an outer circumference of the center panel part 1 A is the chuck wall radius part 1 C.
  • a linear or partially curved potion extending upward from an outer upper end of the chuck wall radius part 1 C, a portion from an outer wall of the annular groove part Cs further to a front of a curve of the curl part 1 E, is the chuck wall part 1 D.
  • t 2 >t 1 holds, where t 1 represents a plate thickness of the center panel part 1 A, and t 2 represents a plate thickness of a bottom end of the panel wall part 1 B.
  • the plate thickness t 1 of the center panel part 1 A 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 1 B is a boundary portion between the chuck wall radius part 1 C and the curve portion r 2 .
  • the plate thickness t 2 of the bottom end of the panel wall part 1 B is made larger than the plate thickness t 1 . This enables the can lid 1 with a still higher pressure resistance in addition to a conventional shape design.
  • the plate thickness t 2 By making the plate thickness t 2 larger than 1.01 times the plate thickness t 1 (t 2 >1.01*t 1 ), it is possible to obtain a can lid 1 with a still higher pressure resistance.
  • t 3 represents a plate thickness of the chuck wall radius part 1 C, larger than the plate thickness t 1 , and preferably making the plate thickness t 3 larger than 1.01 times the plate thickness t 1 >1.01*t 1 ), it is possible to obtain a can lid 1 with a high pressure resistance.
  • t 1 >t 4 holds, where t 4 represents a plate thickness of a middle part of the chuck wall part 1 D, 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 1 D 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 1 B and the chuck wall radius part 1 C of the annular groove part Cs to be shaped at the outer circumference of the center panel part 1 A, 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 1 E.
  • the plate thicknesses of the panel wall part 1 B and the chuck wall radius part 1 C of the annular groove part Cs to be shaped at the outer circumference of the center panel part 1 A can be made larger than the original plate thickness of the material to be processed (the plate thickness t 1 of the center panel part 1 A). 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 S 1 , an outer circumferential part drawing step S 2 , a panel part drawing step S 3 , and a panel part pressing down step S 4 as shown in FIG. 2 .
  • a shape body M 1 shown in FIG. 3 at (a) is shaped by the step S 1 to the step S 3 , and in the step S 4 , the shape body M 1 is subjected to press down processing of a panel part p (a processed part to be processed into the center panel part 1 A).
  • shape bodies M 2 and M 3 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 U 1 and an outer tool U 2 .
  • the lower tool L includes a fixed inner tool L 1 , a movable inner tool L 2 , a movable outer tool L 3 , and a fixed outer tool L 4 .
  • 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 U 2 and a processing surface b of the fixed outer tool L 4 due to descent of the upper tool U shapes a shape body M 01 in a disk shape.
  • the upper tool U descends.
  • a lower surface c of the outer tool U 2 and an upper surface d of the movable outer tool L 3 sandwich an outer circumferential part of a shape body M 02 .
  • the outer circumferential part of the shape body M 02 is subjected to drawing processing by a processing surface e of the movable inner tool L 2 .
  • descent of the upper tool U causes the lower surface c of the outer tool U 2 to press down the movable outer tool L 3 , so that a drawing processing on a shape body M 03 progresses by a processing surface f of the outer tool U 2 and a processing surface g of the movable inner tool L 2 as shown in FIG. 5 at (b).
  • center panel part 1 A is shaped in the panel part p sandwiched between the lower surface of the inner tool U 1 and the upper surface of the fixed inner tool L 1 . 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 1 B and the chuck wall radius part 1 C are shaped by pressing down the panel part p which is the processed part to be processed into the center panel part 1 A and the processed part to be processed into the chuck wall radius part 1 C 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 1 B and the chuck wall radius part 1 C. Further, pressing down of the panel part p causes the processed parts to be processed into the panel wall part 1 B and the chuck wall radius part 1 C 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 L 10 with an ironing convex part k 1 is used. Then, the shape body is ironed between an inner processing surface k 2 of the outer tool U 2 of the upper tool U and the ironing convex part k 1 .
  • ironing can be added to the middle part of the chuck wall part 1 D.
  • a plate thickness of a part of the chuck wall part 1 D 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 S 4 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.
  • t 5 is a plate thickness of the upper end of the panel wall part 1 B.
  • Example 1 the plate thickness t 2 is larger than 1.01 times the plate thickness t 1 .
  • Example 2 and the plate thickness t 3 are larger than 1.01 times the plate thickness t 1 .
  • the plate thickness t 4 is reduced by ironing, so that the metal portion of the processed part to be processed into the panel wall 1 B and the chuck wall radius part 1 C 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 t 2 and t 3 .
  • 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.
  • t 1 >t 4 holds, where t 4 represents the plate thickness of the middle part of the chuck wall part 1 D, 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 1 D 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 t 4 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)
US18/014,950 2020-07-10 2021-06-08 Can lid and manufacturing method therefor Pending US20230256500A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2020-119375 2020-07-10
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

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US20230256500A1 true US20230256500A1 (en) 2023-08-17

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US18/014,950 Pending US20230256500A1 (en) 2020-07-10 2021-06-08 Can lid and manufacturing method therefor

Country Status (6)

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US (1) US20230256500A1 (ja)
EP (1) EP4180349A1 (ja)
JP (1) JP2022016093A (ja)
CN (1) CN115768694A (ja)
TW (1) TW202216543A (ja)
WO (1) WO2022009585A1 (ja)

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
JP5956341B2 (ja) 2010-09-22 2016-07-27 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

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JP2022016093A (ja) 2022-01-21
WO2022009585A1 (ja) 2022-01-13
TW202216543A (zh) 2022-05-01
EP4180349A1 (en) 2023-05-17
CN115768694A (zh) 2023-03-07

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