EP0321394B1 - Ensemble de fermeture en tôle, procédé pour sa fabrication et récipient muni d'un tel ensemble de fermeture - Google Patents

Ensemble de fermeture en tôle, procédé pour sa fabrication et récipient muni d'un tel ensemble de fermeture Download PDF

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Publication number
EP0321394B1
EP0321394B1 EP88810796A EP88810796A EP0321394B1 EP 0321394 B1 EP0321394 B1 EP 0321394B1 EP 88810796 A EP88810796 A EP 88810796A EP 88810796 A EP88810796 A EP 88810796A EP 0321394 B1 EP0321394 B1 EP 0321394B1
Authority
EP
European Patent Office
Prior art keywords
closure
portions
opening
sealing
annular surface
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.)
Expired - Lifetime
Application number
EP88810796A
Other languages
German (de)
English (en)
Other versions
EP0321394A1 (fr
Inventor
Horst Zumsteg
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.)
Amcor Flexibles Rorschach AG
Original Assignee
Alcan Rorschach AG
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 Alcan Rorschach AG filed Critical Alcan Rorschach AG
Priority to AT88810796T priority Critical patent/ATE72188T1/de
Publication of EP0321394A1 publication Critical patent/EP0321394A1/fr
Application granted granted Critical
Publication of EP0321394B1 publication Critical patent/EP0321394B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B65D17/50—Non-integral frangible members applied to, or inserted in, preformed openings, e.g. tearable strips or plastic plugs
    • B65D17/501—Flexible tape or foil-like material
    • B65D17/502—Flexible tape or foil-like material applied to the external part of the container wall only
    • 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
    • B21D51/383—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures scoring lines, tear strips or pulling tabs
    • 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
    • B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
    • B65D2517/0001—Details
    • B65D2517/001—Action for opening container
    • B65D2517/0013—Action for opening container pull-out tear panel, e.g. by means of a tear-tab
    • 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
    • B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
    • B65D2517/0001—Details
    • B65D2517/0058—Other details of container end panel
    • B65D2517/0059—General cross-sectional shape of container end panel
    • B65D2517/0061—U-shaped
    • 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
    • B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
    • B65D2517/50—Non-integral frangible members applied to, or inserted in, a preformed opening
    • B65D2517/5002—Details of flexible tape or foil-like material
    • B65D2517/5013—Details of flexible tape or foil-like material the tape covering almost the whole of the container end panel
    • 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
    • B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
    • B65D2517/50—Non-integral frangible members applied to, or inserted in, a preformed opening
    • B65D2517/5002—Details of flexible tape or foil-like material
    • B65D2517/5024—Material
    • B65D2517/5027—Single layer
    • B65D2517/5029—Single layer and connected to container by local areas of adhesive
    • 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
    • B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
    • B65D2517/50—Non-integral frangible members applied to, or inserted in, a preformed opening
    • B65D2517/504—Details of preformed openings
    • B65D2517/5043—Details of preformed openings provided with a flange
    • B65D2517/5051—Up-turned flange, i.e. extending away from container
    • B65D2517/5054—Up-turned flange, i.e. extending away from container rolled or folded back, e.g. to avoid sharp edges
    • 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
    • B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
    • B65D2517/50—Non-integral frangible members applied to, or inserted in, a preformed opening
    • B65D2517/5072—Details of hand grip, tear- or lift-tab
    • B65D2517/5083—Details of hand grip, tear- or lift-tab with means facilitating initial lifting of tape, e.g. lift or pull-tabs
    • 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
    • B65D2577/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks, bags
    • B65D2577/10—Container closures formed after filling
    • B65D2577/20—Container closures formed after filling by applying separate lids or covers
    • B65D2577/2041—Pull tabs
    • B65D2577/205—Pull tabs integral with the closure

Definitions

  • the present invention relates to a closure unit made of sheet metal for sterilisable containers according to the preamble of patent claim 1.
  • the invention further relates to a method for producing a closure unit from sheet metal according to the preamble of patent claim 6.
  • the present invention also relates to a container with a closure unit made of sheet metal.
  • Closure units of the type mentioned with a membrane that spans the container opening and can be peeled off from the retaining ring of the closure unit are used on containers for packaging food and technical products.
  • Such a closure unit with a cover ring for a tin can made of coated aluminum or tinplate is known from US Pat. No. 4,253,584.
  • the unprotected cutting edge is now outside the product and cannot contaminate it. Protection against corrosion external influences, e.g. when filling the container or due to moisture in the air, are not guaranteed.
  • a hollow bead is formed along the opening through the folded cutting edge.
  • this hollow edge bead means that when the membrane is sealed onto the opening, the sealing can only take place on the narrow ring surface located outside the hollow bead with the necessary high sealing pressure; In the area of the hollow bead, the sealing surface and the membrane to be sealed cannot be pressed against one another to a sufficient extent, so that a secure closure suitable for sterilization is created.
  • This known cover ring has the further disadvantage that when the ring is flanged onto a container edge, the membrane, which is usually a few hundredths of a millimeter thick, and in particular the tear-open tab that is placed against the center on the surface of the membrane, can be damaged to such an extent by the relative movement of the pressure plate of the flanging machine at the beginning of the flanging process that the membrane cannot be torn open afterwards.
  • a closure unit which, similar to the American one mentioned above, has a hollow rim in the area of the opening, which, when the membrane is sealed, also prevents the membrane from being able to be connected to the cover ring in a sterilization-proof manner on the entire sealing surface.
  • the flap is folded twice so that at most one layer is damaged by the flanging machine and the one underneath can survive the flanging process undamaged.
  • a sealing unit for packaging containers is also known from Swiss patent specification 563 284, in which the membrane is sealed onto the cut edge of the container opening which is folded upwards and outwards.
  • Containers with a discharge opening that does not span the entire cross-section of the container are not suitable for packaging food, in particular they are unusable for packaging food that is not pourable but is dimensionally stable.
  • a closure lid for sterilizable cans is also known, in which the cut edge of the opening is also folded upwards and outwards into the plane of the sealing surface.
  • the sealing surface is not only formed by the folded section, but the region of the end surface lying outside the cut edge is deformed by deep drawing in such a way that its surface comes to lie in the plane of the folded cut edge, thereby increasing the sealing surface.
  • This closure cover also has the disadvantage that the pull tab can be damaged by the pressure plate of the flanging machine.
  • the two-part sealing surface means that both sides of the container must be coated with a sealable lacquer.
  • the invention seeks to remedy this.
  • the invention solves the problem of creating a closure unit made of sheet metal for sterilizable containers, in which the unprotected cut edge of the opening can neither corrode by the filling material nor by external influences, and in which the cross section the usable pouring opening through the sealing surface is reduced essentially only by the amount of the sealing surface.
  • Another object of the invention is to design the closure unit in such a way that the tear-open tab on the membrane cannot be damaged by the rotating pressure plate of the flanging machine.
  • the invention as characterized in claims 6 to 9, also solves the problem of creating a method with which a closure unit with a protected cutting edge can be produced.
  • the closure unit according to the invention it is possible to achieve perfect protection of the cut edge against both internal and external influences without the need for an additional corrosion-resistant coating. At the same time, it is possible to make essentially the entire ring surface usable as a sealing surface, since there is no rolled edge preventing proper sealing.
  • the three sections, which abut one another and, depending on the type of coating, are glued to one another form a dimensionally stable, essentially 100% usable sealing surface for the sealing membrane.
  • the raised peripheral apex of the fold area of the two upper sections prevents damage to the tear-open tab lying on the membrane without hindering the flanging process on conventional machines.
  • the raised fold area also ensures simple, precise centering of the membrane before sealing and prevents it from being accidentally sealed onto the collar-shaped part of the closure unit. This creates a perfect prerequisite for a safe detachment of the membrane.
  • the method according to the invention enables the closure unit to be produced in a single deep-drawing stroke which includes all the deformations and cuts.
  • the closure unit 1 has a retaining ring 3 that can be flanged onto a container edge 2 and an annular surface 5 for sealing a closure membrane 7.
  • the retaining ring 3 has a shape like that for the production of a flange connection with the flange edge 2 of a container 11 shown in broken lines.
  • the edge 3 of the retaining ring can have a shape which differs from the shape shown in the figures.
  • a tear tab 13 is attached to the membrane 7 and has been bent upwards and folded over onto the surface of the membrane 7.
  • the sections 21, 23 and the section 25 adjoining the cut edge become as explained in detail later, produced by rolling in the radially outer region 10 of the closure unit 1 adjoining the cutting edge 17 and by subsequently compressing it. After compression, the three sections 21, 23, 25 lie parallel to one another and in contact with one another, as can be seen in FIG.
  • the peripheral folding or folding area 27 of the sections 23 and 27 is bent upwards in such a way that the apex S is higher by the amount b than the surface of the section 23 forming the annular surface 5.
  • the distance b is larger than that double thickness 2s of the sealing membrane 7.
  • a possible production route for the closure unit 1 is explained below with reference to FIGS. 2 to 7.
  • the blanks for the closure unit 1 are punched out from a sheet metal strip 4 or from a sheet metal plate and then provided with a flanged edge 3 by deep drawing, each of which can be designed according to the shape of the edge 2 of the container 11 accordingly.
  • a rondelle 9 is punched out to form the central cutout opening 19 (FIG. 3) and the peripheral section 10 is folded down in a cylindrical manner.
  • the cylindrical section 10 is then rolled in until the cutting edge 17 comes into contact with the collar 6 below the flanged edge 3 and is passed in a spiral along the now completely closed bead 18 until the bead 18 has an overlap of approximately half (in broken lines in FIG. 6).
  • the bead 18 is now squeezed together until the three sections 21, 25, 23 lie flat and well on top of one another.
  • the deformation steps according to FIGS. 2 to 5 take place on the way of the tool to the bottom dead center; the deformation steps according to Figures 6 and 7 during the upward stroke.
  • the deformation or squeezing tool 22 does not reach all the way to the collar or section 6 on the retaining ring 3, so that the peripheral fold 27 is folded up between the sections 23 and 25 and the vertex S thereof by the amount b above the surface of the sealing surface forming the Section 25 comes to rest.
  • the retaining ring 2 can be made of aluminum, white or TFS (Tin Free Steel) sheet.
  • the outside (in FIG. 2 above) has, if necessary, a protective layer against corrosion from the environmental conditions made of polypropylene film or another protective lacquer. Compatibility with the contents does not have to be checked, since the outer coating cannot come into contact with the contents at any point.
  • the inside (bottom in FIG. 2) preferably has a sealable coating, since it has to form the adhesive or sealing surface for the membrane 7 and, if this is made of plastic, a sealing function instead of a separately injected one even when the closure unit is flared Componds 20 takes over.
  • a plastic film or another sealable lacquer can be used as coatings e.g. Polypropylene.

Claims (10)

1. Système de fermeture en tôle mince pour des récipients stérilisables (11), comportant une partie annulaire de soutien (3) prévue pour être fixée par sertissage sur le récipient (11) et présentant une surface annulaire de soudage (5) pour recevoir une membrane (7) qui recouvre l'ouverture (19) du récipient et qui est pourvue d'une patte de déchirure (13), l'arête de découpe (17) de l'ouverture (19) étant repliée dans la surface annulaire (5), caractérisé en ce que la surface annulaire (5) est constituée par trois parties repliées ensemble (21, 23, 25) sensiblement parallèles et superposées, l'arête de découpe (17) étant disposée entre la partie (23) qui constitue la surface de soudage (5) et la partie (21) située en bas.
2. Système de fermeture selon la revendication 1, caractérisé en ce que les trois parties superposées (21, 23, 25) sont étroitement en appui à plat l'une sur l'autre, dans une zone de recouvrement avec la membrane (7).
3. Système de fermeture selon l'une des revendications 1 ou 2, caractérisé en ce que l'arête de découpe (17) est située en regard du fond du pli formé entre la partie supérieure (23) et la partie inférieure (21).
4. Système de fermeture selon l'une des revendications 1 à 3, caractérisé en ce que le bord périphérique (27) du pli des deux parties supérieures (23, 25) est recourbé vers le haut.
5. Système de fermeture selon la revendication 4, caractérisé en ce que le sommet (S) du repli (27) est en saillie au-dessus de la surface annulaire (5), d'une hauteur (b) qui est supérieure au double de l'épaisseur (s) de la membrane (7).
6. Procédé de fabrication pour réaliser un système de fermeture (1) en tôle mince, comportant une partie annulaire de soutien (3) et une surface annulaire (5) qui entoure l'ouverture centrale (19) et qui est formée par trois parties superposées (21, 23, 25) qui sont repliées ensemble à plat, pour recevoir une membrane (7) fixée par soudage, caractérisé en ce qu'on réalise en une seule passe d'emboutissage l'ensemble des opérations de mise en forme et de découpage à la presse du flan primitif (4) destiné à la confection du système de fermeture (1).
7. Procédé selon la revendication 6, caractérisé en ce que:
a)   On découpe à la presse le flan destiné à la confection du système de fermeture,
b)   On forme en périphérie une bordure annulaire de soutien (3) et on emboutit en forme de cuvette la partie centrale,
c)   On découpe à la presse le fond de la partie en cuvette, pour réaliser l'ouverture (19),
d)   On forme par enroulement les parties (21, 23, 25), et
e)   On les écrase à plat

8. Procédé selon la revendication 7, caractérisé en ce qu'on réalise par découpage à la presse une ouverture (19) de diamètre inférieur à celui de la partie en forme de cuvette, et en ce qu'on étire par emboutissage en forme de cylindre la face annulaire qui entoure l'ouverture et qui comprend les trois parties (21, 23, 25).
9. Procédé selon l'une des revendications 7 ou 8, caractérisé en ce qu'on écrase à plat les trois parties enroulées (21, 23, 25) en agissant seulement dans leur partie centrale, et en ce qu'on recourbe vers le haut le bord du repli périphérique (27).
10. Récipient pourvu d'un système de fermeture, caractérisé en ce qu'il est réalisé suivant le procédé conforme à la revendication 6.
EP88810796A 1987-12-14 1988-11-21 Ensemble de fermeture en tôle, procédé pour sa fabrication et récipient muni d'un tel ensemble de fermeture Expired - Lifetime EP0321394B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88810796T ATE72188T1 (de) 1987-12-14 1988-11-21 Verschlusseinheit aus blech, verfahren zu deren herstellung und behaelter mit einer verschlusseinheit.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4867/87 1987-12-14
CH4867/87A CH674829A5 (fr) 1987-12-14 1987-12-14

Publications (2)

Publication Number Publication Date
EP0321394A1 EP0321394A1 (fr) 1989-06-21
EP0321394B1 true EP0321394B1 (fr) 1992-01-29

Family

ID=4283938

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88810796A Expired - Lifetime EP0321394B1 (fr) 1987-12-14 1988-11-21 Ensemble de fermeture en tôle, procédé pour sa fabrication et récipient muni d'un tel ensemble de fermeture

Country Status (7)

Country Link
US (2) US4915254A (fr)
EP (1) EP0321394B1 (fr)
AT (1) ATE72188T1 (fr)
CH (1) CH674829A5 (fr)
DE (1) DE3868254D1 (fr)
ES (1) ES2030898T3 (fr)
GR (1) GR3004329T3 (fr)

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EP0990590A1 (fr) * 1998-10-02 2000-04-05 Union Deutsche Lebensmittelwerke GmbH Boíte
US6601727B2 (en) 2000-11-09 2003-08-05 Rasselstein Hoesch Gmbh Can lid
DE10197223B4 (de) * 2001-03-29 2013-04-18 Industrias Alimentarias De Navarra, S.A. Dichtung für Konserven, insbesondere Eingemachtes

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PT1905698E (pt) * 2006-09-29 2010-06-24 Soudronic Ag Embalagem com uma tampa de abertura fácil, tampa de abertura fácil e anel de tampa de abertura fácil
EP2052984B1 (fr) * 2007-10-25 2010-12-15 IMPRESS Group B.V. Méthode pour préparer et former un couvercle et couvercle
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CA2840938C (fr) * 2011-07-21 2019-07-02 Crown Packaging Technology, Inc. Boites metalliques a opercule detachable
US9267705B2 (en) 2013-03-05 2016-02-23 A. O. Smith Corporation Membrane seal for water heater tank spuds
EP3279105A1 (fr) * 2016-08-02 2018-02-07 Amcor Flexibles Singen GmbH Bague de couvercle
CN113345743B (zh) * 2021-05-13 2023-06-30 南京越坤电气自动化有限公司 一种双向式灭弧罩固定片生产装置

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US4540105A (en) * 1984-08-13 1985-09-10 General Can Company, Inc. Closure opening having protective bead
US4557398A (en) * 1984-08-17 1985-12-10 International Paper Company End closure structure for a container
US4544080A (en) * 1984-10-25 1985-10-01 General Can Company, Inc. Closure having reinforced pull tab

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0990590A1 (fr) * 1998-10-02 2000-04-05 Union Deutsche Lebensmittelwerke GmbH Boíte
US6601727B2 (en) 2000-11-09 2003-08-05 Rasselstein Hoesch Gmbh Can lid
DE10197223B4 (de) * 2001-03-29 2013-04-18 Industrias Alimentarias De Navarra, S.A. Dichtung für Konserven, insbesondere Eingemachtes

Also Published As

Publication number Publication date
CH674829A5 (fr) 1990-07-31
EP0321394A1 (fr) 1989-06-21
ATE72188T1 (de) 1992-02-15
US4915254A (en) 1990-04-10
US5020955A (en) 1991-06-04
DE3868254D1 (de) 1992-03-12
ES2030898T3 (es) 1992-11-16
GR3004329T3 (fr) 1993-03-31

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