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EP0919482A1 - Metalldose und Verfahren zur Herstellung derselben - Google Patents

Metalldose und Verfahren zur Herstellung derselben Download PDF

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Publication number
EP0919482A1
EP0919482A1 EP98305031A EP98305031A EP0919482A1 EP 0919482 A1 EP0919482 A1 EP 0919482A1 EP 98305031 A EP98305031 A EP 98305031A EP 98305031 A EP98305031 A EP 98305031A EP 0919482 A1 EP0919482 A1 EP 0919482A1
Authority
EP
European Patent Office
Prior art keywords
shell
opening
metallic
annular flange
annular
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.)
Withdrawn
Application number
EP98305031A
Other languages
English (en)
French (fr)
Inventor
Seizi Kawamata
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.)
Nihon Seikan KK
Original Assignee
Nihon Seikan KK
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 Nihon Seikan KK filed Critical Nihon Seikan KK
Publication of EP0919482A1 publication Critical patent/EP0919482A1/de
Withdrawn legal-status Critical Current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
    • B65D7/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal
    • B65D7/02—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by shape
    • B65D7/04—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by shape of curved cross-section, e.g. cans of circular or elliptical cross-section
    • 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
    • B65D2251/00—Details relating to container closures
    • B65D2251/0003—Two or more closures
    • B65D2251/0006—Upper closure
    • B65D2251/0018—Upper closure of the 43-type
    • B65D2251/0021—Upper closure of the 43-type of the B65D43/16-type
    • 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
    • B65D2251/00—Details relating to container closures
    • B65D2251/0003—Two or more closures
    • B65D2251/0068—Lower closure
    • B65D2251/0093—Membrane

Definitions

  • the present invention relates generally to a can and a method of manufacturing the same. More particularly, it relates to a metallic can including a can shell with an opening on one end or at the top and an annular flange formed as an integral part of the can shell on its inner side wall in the neighborhood of the opening of the can shell for attaching a separator film or foil sheet to the said annular flange to seal the can hermetically, and a method of manufacturing such a metallic can.
  • swipe as used herein should be understood to mean any tool that may be used to remove any extra part of a content on a spoon or like by rubbing that part off, when the content is taken out of a can by using the spoon.
  • a conventional metallic can that has an annular flange on the inner wall side of the can shell in the neighborhood of the opening on one end thereof for attaching a separator film or foil sheet to the said annular flange.
  • the annular flange is provided separately from the can shell during the can manufacturing process, and is then fitted around the inner side wall of the can shell and secured thereto.
  • annular flange and the can shell are made of a different material and are produced separately from each other. This increases the usage of the material.
  • the can manufacturing process involves two different steps, i.e., the step of forming an annular flange and the step of attaching it to the can shell formed separately from it.
  • An additional disadvantage, which is associated with the above disadvantage, is that the manufacturing costs for the final metallic can products must be increased.
  • an object of the present invention is to provide a metallic can that includes an annular flange formed on the inner side wall of a can shell near the opening of the can shell as an integral part thereof by adding the process for forming the said annular flange into the manufacturing process of said can.
  • One aspect of the present invention is to provide a metallic can product that includes an annular flange that is formed on the inner side wall of a can shell near the top opening of the can shell as an integral part thereof.
  • Another aspect of the present invention is to provide a method of manufacturing a metallic can product, including the steps of reducing the diameter of the area of a formed metallic can shell delimiting an opening on one end thereof by elongating that area outwardly in parallel with the axis of the can shell for thereby providing a reduced-diameter opening, pressing the portion of the can shell wall located near the reduced-diameter opening inwardly toward the center of the can shell for thereby providing an annular projection extending from the inner can shell wall inwardly toward the center of the can shell, and flattening the annular projection by pressing it in the direction parallel with the axis of the can shell for thereby providing the annular flange on the inner can shell wall as an integral part of the can shell.
  • an annular flange may be formed as an integral part of a metallic can shell on the portion of its inner side wall located near the top opening, and this formation may be performed as a part of the existing manufacturing process during which a metallic can shell is formed.
  • metallic can including the integral annular flange, may be produced efficiently in the successive manner on the same production line used in the existing manufacturing process.
  • material may be saved, and the manufacturing cost may be reduced accordingly.
  • the area of the can shell delimiting the top opening may be reduced diametrically by elongating that area outwardly in parallel with the axis of the can shell.
  • the thickness of the area delimiting the opening can remain unchanged, and no deformation such as wrinkles can occur on that area.
  • annular projection may be formed by elongating the part of the can shell wall located near the opening by pressing that part inwardly toward the center of the can shell, such that the annular projection extends from the inner side wall inwardly toward the center of the can shell. Therefore, no deformation such as wrinkles can occur on the outer can shell side wall.
  • annular projection may be flattened by applying the pressure upon it in the transverse direction.
  • the annular flange thus obtained has the double construction including the upper and lower parts formed like a U shape. Thus, it has the highly strong construction.
  • the method according to the present invention avoids that the area of the can shell delimiting the opening be unnecessarily thickened, or any deformation such as wrinkles that would affect the appearance of the outer side wall of the can shell. Rather, the highly strong annular flange can make the opening area more strong enough to resist any external force. Thus, the method of the present invention allows for use of any can material that is comparatively thin.
  • the method according to the present invention may include an additional step of curling the area of the can shell delimiting the reduced-diameter opening in the usual manner known per se, before or after the step of forming the annular projection.
  • the method according to the present invention may include an additional step of mounting a bottom plate on the area of the can shell delimiting an opening on the other end or bottom in the usual manner also known per se, following the preceding steps described above.
  • the metallic can that may be obtained as described above, it includes the annular flange formed as an integral part of the can shell and extending inwardly from the inner side wall located near the opening.
  • the annular flange may be formed from the base can material, it can save material.
  • the area of the can shell delimiting the opening can be strengthened, and no deformation such as wrinkles can occur on the outer can shell wall. Thus, the good appearance can be retained.
  • a first preferred embodiment of a metallic can according to the present invention is described by referring to Figs. 1 and 3.
  • the metallic can generally shown by 4, includes a can shell 1 having an opening 2 on one end or at the top, and an annular flange 3 that is formed as an integral part of the can shell 1 such that the annular flange 3 extends from the inner wall of the can shell 1 inwardly toward the center of the can shell in the neighborhood of the opening 2.
  • the can 4 includes a bottom plate 16 on the other end thereof opposite the opening 2, and a separator sheet 5, such as film, foil and the like, covering the opening 2 and having its peripheral margin attached to the annular flange 3 by any adhesive or like.
  • the content is thus hermetically enclosed inside the can shell 1.
  • the opening 2 may be closed by a can cover.
  • the closure may be performed by pressing the can cover 6 onto the can shell (Fig. 3).
  • the part designated by 7 in Fig. 3 is a sealing band formed on the lower side of the peripheral wall 20 of the can cover 6, that is to say, a sealing band 7 is formed under the thinner wall portion 25 of the peripheral wall 20.
  • the cover 6 can only be removed from the can shell 1 by detaching the sealing band 7 from the entire can cover 6.
  • a thin blank 8 for producing a metallic can may be formed to a cylindrical can shell 1 in the usual manner (Fig. 2 (b)).
  • the peripheral area of the can shell 1 which delimits an opening 2a on one end thereof may then be elongated outwardly in parallel with the axis of the can shell, that is, in the direction of arrow 9 in Fig. 2 (b). This elongation may occur by reducing the diameter of the opening 2a until a reduced diameter opening 2 can be obtained (Fig. 2 (c)).
  • a curled portion 10 may be formed by curling the peripheral edge delimiting the opening 2 (Fig. 2 (d)). Then, the part of the can shell wall located nearer to the opening 2 may be pressed in the direction of arrow 11, that is, in the direction in which it can be elongated in such a manner as to be pushed from the can shell wall inwardly toward the center of the can shell.
  • An annular U-shape recess 12a may thus be formed (Fig. 2 (e)). When it is viewed from the side of the inner can shell wall, the annular U-shape recess 12a is the annular projection 12b (Fig. 2 (e)).
  • annular projection 12b may be sandwiched between lower mold 13 and an upper mold 14, and may be pressed by the upper mold 14 against the lower mold 13 in the direction of arrow 15 (Fig. 2 (e)).
  • An annular flange 3 may thus be obtained as an integral part of the inner can shell wall (Fig. 2 (f)).
  • a metallic can 4 may be completed (Fig. 2 (f)).
  • the annular flange 3 is formed like a double construction having upper and lower parts pressed tightly like the U shape.
  • the step of curling the peripheral margin 10 as described above may be performed, following me step of forming the annular flange 3.
  • a bottom plate 16 may be mounted to the bottom opening on the side opposite the side on which the opening 2 is provided, and this mounting may be performed in the conventional, usual manner.
  • a can shell may be now finished according to the request.
  • the metallic can 4 obtained as described above may be used as follows.
  • the peripheral margin of the separator film 5 (for example, aluminum foil) may be attached to the annular flange 3 of the metallic can 4 by adhesive or like.
  • the separator film 5 covers the opening 2 of the can shell, sealing it or the content therein hermetically as shown in Fig. 3.
  • a cover 6 with an integrally formed scraper (for example, as described in the applicant's co-pending European patent application claiming priority from Japanese patent application no. 9-335913, the contents of which are incorporated herein by reference) or any other conventional cover may be mounted onto the opening 2 by pressing the cover upon the opening 2.
  • a set of a can 4 with the separator film 5 attached to the annular flange 3, a cover 6 mounted on the can 4 and a bottom plate 16 is offered to the commercial market.
  • a user of this set may use a metallic can 4 by putting a content into the can shell through the bottom open side opposite the opening 2, mounting the bottom plate 16 onto the bottom open end by curling, and keeping the content hermetic as shown in Fig. 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
EP98305031A 1997-11-27 1998-06-25 Metalldose und Verfahren zur Herstellung derselben Withdrawn EP0919482A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP326013/97 1997-11-27
JP32601397 1997-11-27

Publications (1)

Publication Number Publication Date
EP0919482A1 true EP0919482A1 (de) 1999-06-02

Family

ID=18183129

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98305031A Withdrawn EP0919482A1 (de) 1997-11-27 1998-06-25 Metalldose und Verfahren zur Herstellung derselben

Country Status (1)

Country Link
EP (1) EP0919482A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1800770A1 (de) * 2005-12-23 2007-06-27 Crown Packaging Technology, Inc Dosenkörper mit einer auf einem Flansch oder Stufe gelegten Dichtungsmasse und Verfahren zur Herstellung eines solchen Dosenkörpers

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB532834A (en) * 1939-09-21 1941-01-31 Benger S Food Ltd Improvements in cartons, canisters and the like
FR2154624A1 (de) * 1971-09-27 1973-05-11 Metal Box Co Ltd
FR2192946A1 (de) * 1972-07-17 1974-02-15 Continental Can Co
GB2072131A (en) * 1980-03-25 1981-09-30 Alusuisse Metal cans with membrane closures
FR2639561A1 (fr) * 1988-11-29 1990-06-01 Carnaud Sa Procede de fabrication d'un emballage metallique a opercule souple et emballage metallique correspondant

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB532834A (en) * 1939-09-21 1941-01-31 Benger S Food Ltd Improvements in cartons, canisters and the like
FR2154624A1 (de) * 1971-09-27 1973-05-11 Metal Box Co Ltd
FR2192946A1 (de) * 1972-07-17 1974-02-15 Continental Can Co
GB2072131A (en) * 1980-03-25 1981-09-30 Alusuisse Metal cans with membrane closures
FR2639561A1 (fr) * 1988-11-29 1990-06-01 Carnaud Sa Procede de fabrication d'un emballage metallique a opercule souple et emballage metallique correspondant

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1800770A1 (de) * 2005-12-23 2007-06-27 Crown Packaging Technology, Inc Dosenkörper mit einer auf einem Flansch oder Stufe gelegten Dichtungsmasse und Verfahren zur Herstellung eines solchen Dosenkörpers
WO2007071682A1 (en) * 2005-12-23 2007-06-28 Crown Packaging Technology, Inc Can body with a sealing compound placed on a step or flange and method of forming such a can body

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