EP0221842B1 - Pour opening in a container cover with a pull tab , and production of this opening - Google Patents

Pour opening in a container cover with a pull tab , and production of this opening Download PDF

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Publication number
EP0221842B1
EP0221842B1 EP86810401A EP86810401A EP0221842B1 EP 0221842 B1 EP0221842 B1 EP 0221842B1 EP 86810401 A EP86810401 A EP 86810401A EP 86810401 A EP86810401 A EP 86810401A EP 0221842 B1 EP0221842 B1 EP 0221842B1
Authority
EP
European Patent Office
Prior art keywords
opening
rolled flange
flange
pull tab
container cover
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
Application number
EP86810401A
Other languages
German (de)
French (fr)
Other versions
EP0221842A1 (en
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 AT86810401T priority Critical patent/ATE47818T1/en
Publication of EP0221842A1 publication Critical patent/EP0221842A1/en
Application granted granted Critical
Publication of EP0221842B1 publication Critical patent/EP0221842B1/en
Expired 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
    • B65D53/08—Flexible adhesive strips adapted to seal filling or discharging apertures
    • 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
    • B65D2517/008—Materials of container end panel
    • B65D2517/0085—Foil-like, e.g. paper or cardboard
    • B65D2517/0086—Foil-like, e.g. paper or cardboard laminated
    • 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
    • B65D2517/008—Materials of container end panel
    • B65D2517/0085—Foil-like, e.g. paper or cardboard
    • B65D2517/0088—Foil-like, e.g. paper or cardboard with plastic overmoulded onto foil
    • 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
    • B65D2517/501—Details of flexible tape or foil-like material with the tape, or one layer thereof, being folded to cover both the top and bottom of 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
    • B65D2517/5032—Laminated
    • 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

Abstract

1. Method of producing a finished pour opening in a container cover formed from aluminium as a light and gas barrier and from plastics material as protective and sealing layers, having a cutting edge, which is protected from corrosion, along the punched rough opening, characterized in that a) the rough opening (9) is punched-out ; b) a rolled flange (11) is produced along the rough opening (9) in such a manner that the cutting edge (19) abuts, or almost abuts, the root (17) of the rolled flange (11) ; c) the rolled flange (11) is flattened in a calibration station (13), and an accurately defined, calibrated, finished opening (99) is produced ; and d) the rolled flange (11) is thereby flattened until the protective layer (15), which is applied to the cover (1), is displaced from the interior of the rolled flange (11) between the cutting edge (19) and the root (17) in such a manner that the edge (19) is covered with the displaced protective layer (15) and is sealed against corrosion.

Description

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung einer kalibrierten Ausgussöffnung in einem Behälterdeckel gemäss Oberbegriff des Patentanspruches I.The present invention relates to a method for producing a calibrated pouring opening in a container lid according to the preamble of claim I.

Die Erfindung betrifft weiter einen Behälterdeckel für einen Behälter mit einer Aufreisslasche gemäss Oberbegriff des Patentanspruches 5.The invention further relates to a container lid for a container with a tear tab according to the preamble of claim 5.

Aufreissbare Trink- oder Ausgussöffnungen an Behälterdeckeln von Behältern für drucklose Füllgüter, z.B. Fruchtsäfte, sind bekannt. Bei Verwendung von Behälterdeckeln aus einem Verbundmaterial, bei dem Aluminium als Licht- und Gasschranke zwischen Kunststoff- oder Papierschichten eingebettet ist, besteht die Gefahr, dass durch die Säure im Füllgut das entlang der Ausgussöffnung freigelegte Aluminium korrodiert und den Inhalt der Verpackung kontaminiert. Um diese Korrosion zu verhindern, schlägt die deutsche Offenlegungsschrift Nr. 3 321 572 vor, die Ausgussöffnung von innen mit einer Kunststoffolie abzudecken, so dass der Fruchtsaft bzw. dessen Säure nicht in Kontakt mit der freigelegten Kante bzw. dem freigelegten Aluminium im Deckel in Berührung gelangen kann.Tearable drinking or pouring openings on container lids of containers for unpressurized filling goods, e.g. Fruit juices are known. When using container lids made of a composite material, in which aluminum is embedded as a light and gas barrier between plastic or paper layers, there is a risk that the acid in the filling material corrodes the aluminum exposed along the pouring opening and contaminates the contents of the packaging. In order to prevent this corrosion, German Offenlegungsschrift No. 3 321 572 suggests covering the pouring opening from the inside with a plastic film so that the fruit juice or its acid does not come into contact with the exposed edge or the exposed aluminum in the lid can reach.

Die im Recherchenbericht genannte EP-A 1 0 090 057 betrifft einen formfesten Verschlussdeckel aus Blech für sterilisierbare Dosen mit einem Befestigungsring, auf dem ein Membranteil aufgesiegelt ist. Die Siegelfläche wird gebildet aus dem die Schnittkante für die zentrale Oeffnung enthaltenden zurückgefalteten Randbereich sowie einer radial ausserhalb liegenden Ringfläche am Befestigungsring. Die Schnittkante soll durch die Siegelverbindung nach aussen durch die Deckel-Membrane luftdicht abgedeckt werden.EP-A 1 0 090 057 mentioned in the search report relates to a dimensionally stable sealing cover made of sheet metal for sterilizable cans with a fastening ring on which a membrane part is sealed. The sealing surface is formed from the folded-back edge area containing the cut edge for the central opening and a radially outer ring surface on the fastening ring. The cut edge should be covered airtight by the sealing connection to the outside through the cover membrane.

Eine direkte Beschichtung der korrosionsgefährdeten Kante erfolgt nicht, so dass bei deren Herstellung oder nach dem Aufreissen des Membrandeckels an die ungeschützte Kante gelangende Stoffe, z.B. Citrussäfte, sofort Korrosion erzeugen und nach kurzer Zeit den Inhalt kontaminieren können. Nebst den genannten ungenügenden Eigenschaften bezüglich des Korrosionsschutzes ist der bekannte Deckel nicht geeignet, aus einem nicht formfesten Verbundmaterial hergestellt zu werden.The edge, which is at risk of corrosion, is not coated directly, so that when it is manufactured or after the membrane cover has been torn open, substances reaching the unprotected edge, e.g. Citrus juices, generate corrosion immediately and can contaminate the contents after a short time. In addition to the inadequate properties mentioned with regard to corrosion protection, the known cover is not suitable for being produced from a non-dimensionally stable composite material.

Die weiter im Recherchenbericht genannte GB-A 2 022 474 betrifft ebenfalls einen formfesten Alu-oder Weissblech-Deckelring, der mit einer in der Praxis äusserst dünnen Korrosionsschutzschicht geschützt ist.GB-A 2 022 474, which is also mentioned in the search report, also relates to a dimensionally stable aluminum or tinplate cover ring which is protected with an extremely thin corrosion protection layer in practice.

Die scharfe Schnittkante wird zwecks Schutz vor Korrosion durch das Füllgut nach aussen umgelegt. Die Kante bleibt auch nach dem Aufsiegeln einer Deckmembrane völlig ungeschützt und ist der Korrosion durch die Luftfeuchtigkeit oder beim Abfüllen entwichenen Füllgutes ausgesetzt.The sharp cutting edge is folded outwards for protection against corrosion by the product. The edge remains completely unprotected even after a cover membrane has been sealed and is exposed to corrosion caused by air humidity or contents which have escaped during filling.

Die Aufgabe der vorliegenden Erfindung besteht nun darin, eine kalibrierte, d.h. genau masshaltige Ausgussöffnung mit beliebiger Querschnittsform für einen Behälter zu schaffen, deren Kanten gegen Korrosion durch das Füllgut geschützt sind. Eine weitere Aufgabe der Erfindung besteht in der Schaffung einer Ausgussöffnung, die es erlaubt, nach dem Aufreissen einen Wiederverschluss einzufügen, z.B. in Form eines Kunststoffteils oder einer verformten Aufreisslasche, die selbst als Wiederverschluss dient.The object of the present invention is now to provide a calibrated, i.e. To create a precisely dimensioned pouring opening with any cross-sectional shape for a container, the edges of which are protected against corrosion by the filling material. Another object of the invention is to provide a pouring spout which allows a reclosure to be inserted after tearing, e.g. in the form of a plastic part or a deformed pull tab, which itself serves as a reclosure.

Die Erfindung, wie sie in den Ansprüchen gekennzeichnet ist, löst diese Aufgabe mit einem Verfahren gemäss den kennzeichnenden Merkmalen des Patentanspruches 1 sowie mit einem Behälterdeckel gemäss den kennzeichnenden Merkmalen des Patentanspruches 5.The invention, as characterized in the claims, achieves this object with a method according to the characterizing features of patent claim 1 and with a container lid according to the characterizing features of patent claim 5.

In überraschender Weise gelingt es mit dem erfindungsgemässen Verfahren, in zwei Arbeitsgängen einerseits die Rohröffnung auszustanzen und einen Rollbördel zu bilden und andererseits die Kante des Rollbördels mit dem auf dem Deckel aufgebrachten Kunststoff gegen Korrosion zu versiegeln, den Bördel abzuflachen und gleichzeitig einen im voraus bestimmten masshaltigen Querschnitt der Fertigöffnung beizubehalten.Surprisingly, the method according to the invention succeeds in punching out the pipe opening and forming a roll flange in two work steps on the one hand and sealing the edge of the roll flange with the plastic applied to the lid against corrosion, flattening the flange and at the same time flattening a predetermined one Maintain cross-section of the finished opening.

Es ist auch möglich, eine Aufreisslasche aufzusiegeln, die in die fertige Ausgussöffnung eingreift und diese teilweise hintergreift, und welche nach dem Aufreissen als Wiederverschluss dienen kann.It is also possible to seal a tear-open tab which engages in the finished pouring opening and partially engages behind it, and which can serve as a reclosure after the tear-open.

Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den abhängigen Ansprüchen beschrieben.Further advantageous embodiments of the invention are described in the dependent claims.

Anhand illustrierter Ausführungsbeispiele wird die Erfindung näher erläutert. Es zeigen:

  • Figur 1 eine schematische Darstellung der Herstellung eines Deckels mit einer Aufreisslasche,
  • Figur 2 die Ausgussöffnung nach der Bildung des Rollbördels,
  • Figur 3 die Ausgussöffnung nach dem Abflachen, Kalibrieren und Versiegeln der Schnittkante,
  • Figur 4 die Ausgussöffnung mit einer aufgesiegelten flachen Aufreisslasche,
  • Figur 5 einen Ausschnitt aus der Ausgussöffnung mit einer steckbaren Aufreisslasche und
  • Figur 6 eine Draufsicht auf einen Deckel mit einer dreieckigen Ausgussöffnung und einer darauf gesiegelten Aufreisslasche.
The invention is explained in more detail on the basis of illustrated exemplary embodiments. Show it:
  • FIG. 1 shows a schematic representation of the production of a cover with a tear-open tab,
  • FIG. 2 shows the pouring opening after the rolling flange has been formed,
  • FIG. 3 the pouring opening after flattening, calibrating and sealing the cut edge,
  • FIG. 4 shows the pouring opening with a sealed, flat pull tab,
  • 5 shows a section of the pouring opening with a plug-in tear tab and
  • Figure 6 is a plan view of a lid with a triangular pouring opening and a tear tab sealed thereon.

In der schematischen Darstellung der Arbeitsgänge bei der Herstellung eines Deckels 1 für einen Behälter, z.B. eine Fruchtsaft-Packung, wird ein auf einer Rolle 3 aufgewickelter Streifen 5 eines mehrschichtigen Materials schrittweise durch eine erste Arbeitsstation 7 gefördert, in der eine Rohöffnung 9 aus dem Streifen 5 ausgestanzt und gleichzeitig ein Bördel 11 entlang der Fertigöffnung 99 erzeugt wird.In the schematic representation of the operations in the manufacture of a lid 1 for a container, e.g. a fruit juice pack, a strip 5 of a multilayer material wound on a roll 3 is conveyed step by step through a first work station 7, in which a raw opening 9 is punched out of the strip 5 and at the same time a bead 11 is produced along the finished opening 99.

In einer Arbeitsstation 13 wird mit einem beheizten Kalibrierwerkzeug der Querschnitt der Fertigöffnung 99 festgelegt und gleichzeitig der anfänglich im Querschnitt im wesentlichen kreisrunde Bördel 11 abgeflacht, und zwar so weit, bis durch die Erwärmung der Kunststoff-Film 15 auf dem Deckel 1 schmilzt und zwischen der Wurzel 17 des Bördels 11 und der Schnittkante 19 am Ende des Bördels 11 herausgedrängt wird und dort die Schnittkante 19 mit Kunststoff abdeckt.In a work station 13, the cross section of the finished opening 99 is fixed with a heated calibration tool and, at the same time, the flare 11, which is initially circular in cross section, is flattened, until the plastic film 15 melts on the lid 1 by heating and between the Root 17 of the flange 11 and the cutting edge 19 is pushed out at the end of the flange 11 and there covers the cutting edge 19 with plastic.

In der Arbeitsstation 18 wird auf die in der beschriebenen Weise vorbereitete Fertigöffnung 99 entlang der beim Abflachen gebildeten Siegelfläche A eine Aufreisslasche 21 aufgesiegelt, welche vonIn the work station 18, a tear-open flap 21 is sealed onto the finished opening 99 prepared in the manner described along the sealing surface A formed during the flattening, which of

einer Rolle 25 in einem Trägerband 27 unter ein Siegelwerkzeug 29 in die Arbeitsstation 19 gefördert wird. Die Aufreisslaschen 21 könnten selbstverständlich auch einzeln zugeführt werden.a roll 25 in a carrier belt 27 is conveyed under a sealing tool 29 into the work station 19. The tear tabs 21 could of course also be fed individually.

Die Werkzeuge der drei Arbeitsstationen 7, 13, 18 können in einer einzigen Presse 31 bzw. einem einzigen Mehrfachwerkzeug angeordnet sein, von der in Figur 1 nur gerade die obere 33 und die untere Wange 35 angedeutet sind.The tools of the three work stations 7, 13, 18 can be arranged in a single press 31 or a single multiple tool, of which only the upper 33 and the lower cheek 35 are indicated in FIG. 1.

Die Ausbildung der Werkzeuge zum Stanzen und Erzeugen des Bördels 11 (erste Arbeitsstation 7), zum Kalibrieren und Abflachen des Bördels 11 (zweite Arbeitsstation 13) sowie zum Aufsiegeln der Aufreisslasche 15 auf den Bördel 11 sind nicht Gegenstand der Erfindung und werden daher auch nicht näher beschrieben.The design of the tools for punching and producing the flange 11 (first work station 7), for calibrating and flattening the flange 11 (second work station 13) and for sealing the tear-open tab 15 onto the flange 11 are not the subject of the invention and are therefore not further described described.

Die in Figur 2 dargestellte halbfertige Öffnung 9 nach dem ersten Arbeitsgang weist einen Durchmesser D auf, der grösser ist als der kalibrierte Durchmesser d nach dem zweiten Arbeitsgang. Die Kante 19 berührt die Wurzel 17 nicht, d.h. der Bördel 11 ist nicht geschlossen, weil die dünne, als Licht-und Dampfsperre dienende Aluminiumschicht 37 im Streifen 5 nicht in der Lage ist, die von den Kunststoffbeschichtungen 39 auf der Aussenseite und 15 auf der Innenseite ausgehende Rückstellkraft aufzuheben und den Bördel 11 vollständig eingerollt zu halten. Je kleiner nämlich der Radius r des Bördels 11 und je dünner die Aluminiumschicht 37 gewählt werden, umso schlechter behalten die Bördel 11 die Einrollung bei, weshalb durch das Bördeln ein Kantenschutz, wie bei reinen Alubehältern sonst üblich, nicht mehr gewährleistet ist.The semi-finished opening 9 shown in FIG. 2 after the first operation has a diameter D that is larger than the calibrated diameter d after the second operation. The edge 19 does not touch the root 17, i.e. the flange 11 is not closed because the thin aluminum layer 37 serving as a light and vapor barrier in the strip 5 is not able to cancel out the restoring force emanating from the plastic coatings 39 on the outside and 15 on the inside and completely rolls up the flange 11 to keep. The smaller the radius r of the flange 11 and the thinner the aluminum layer 37, the worse the flange 11 will retain the curl, which is why edge protection, as is usually the case with pure aluminum containers, is no longer guaranteed.

In der Figur 3 ist durch das Zusammendrücken des Bördels 11 die kreisringförmige Siegelfläche A entstanden und der Durchmesser auf d verkleinert worden. Je nachdem wie gross der Durchmesser des Bördels 11 gewählt wird, kann beim Kalibrieren die Breite A der Siegelfläche auf dem Bördel 11 beeinflusst werden. Es ist somit möglich, durch die Wahl des Durchmessers d des Kalibrierwerkzeuges verschieden breite Siegelflächen A herzustellen. Die Kunststoffbeschichtung 15, die die Oberseite des Deckels 1 bildet und im Bördel 11 innen zu liegen kommt, ist innerhalb des Bördels 11 aufgeschmolzen und hat beim Herausquellen die Kante 19 vollständig abgedeckt, so dass austretendes Füllgut keine Korrosion der Aluminiumschicht 37 bewirken kann.In FIG. 3, the annular sealing surface A has been created by compressing the flange 11 and the diameter has been reduced to d. Depending on how large the diameter of the flange 11 is chosen, the width A of the sealing surface on the flange 11 can be influenced during calibration. It is thus possible to produce sealing surfaces A of different widths by choosing the diameter d of the calibration tool. The plastic coating 15, which forms the top of the lid 1 and comes to rest inside the flange 11, is melted inside the flange 11 and has completely covered the edge 19 when it swells out, so that emerging contents cannot cause corrosion of the aluminum layer 37.

Der auf diese Weise versiegelte Bördel 11 ändert beim Aufsiegeln der Aufreisslasche 21 seine geometrische Gestalt im wesentlichen nicht mehr, so dass in die nun kalibrierte Fertigöffnung 99 je nach dem Aufreissen der Lasche 21 ein Verschluss zum Wiederverschliessen einsetzbar ist.The flange 11 sealed in this way essentially no longer changes its geometrical shape when the tear-open tab 21 is sealed, so that a closure for reclosing can be inserted into the now calibrated finished opening 99, depending on the tear-open of the tab 21.

In Figur 4 ist eine flache Aufreisslasche 21 aufgesiegelt, deren Beschichtung 43 mit der die Siegefläche A bildenden Kunststoffschicht 39 eine sichere, jedoch schälbare Verbindung eingeht. Je nachdem, aus welchem Material die Kunststoffschicht 15 besteht, findet auch dort eine gute schälbare Verbindung mit der Aufreisslasche 21 statt, die jedoch weniger haftet als die Verbindung mit der Schicht 39. Als Verschluss zum Wiederverschliessen der Fertigöffnung kann ein Kunststoffteil verwendet werden, das separat mit dem Behälter geliefert wird.In FIG. 4, a flat tear-open tab 21 is sealed, the coating 43 of which forms a secure but peelable connection with the plastic layer 39 forming the sieve surface A. Depending on the material of which the plastic layer 15 is made, there is also a good peelable connection with the tear-open tab 21, which, however, is less adhesive than the connection with the layer 39. A plastic part can be used as a closure for reclosing the finished opening, which separately is supplied with the container.

Anstelle der flachen Aufreisslasche 21 kann auch eine Aufreisslasche 21 mit einem Verschlussteil 20 gemäss Figur 5 verwendet werden. Die Aufreisslasche 21 mit dem Verschlussteil 20 kann ebenfalls aus einem Verbundmaterial bestehen, wobei die Dicke der Aluminium- und Kunststoffschicht so gross gewählt wird, dass eine genügende Eigenstabilität erreicht werden kann, die ein mehrmaliges Einsetzen in die Fertigöffnung 99 gewährleistet. Beim Einsatz einer sehr dünnen, nur dem dichten Verschluss dienenden verformten Aufreisslasche 21 kann in die Aufreisslasche 21 im Bereich der Fertigöffnung 99 bereits vor dem Aufsiegeln ein Kunststoffwiederverschluss eingesetzt oder eingelegt sein. Es ist auch möglich, beim Aufsiegeln der Aufreisslasche 21 den zentralen, über der Fertigöffnung 99 liegenden Teil mittels eines Stempels napfartig nach unten zu drücken und so den Verschlussteil 20 auszubilden.Instead of the flat tear-open tab 21, a tear-open tab 21 with a closure part 20 according to FIG. 5 can also be used. The tear-open tab 21 with the closure part 20 can also consist of a composite material, the thickness of the aluminum and plastic layer being chosen so large that sufficient inherent stability can be achieved which ensures repeated insertion into the finished opening 99. If a very thin, deformed tear tab 21 serving only for the tight closure is used, a plastic reclosure can be inserted or inserted into the tear tab 21 in the area of the finished opening 99 before sealing. It is also possible, when the tear-open tab 21 is sealed, to press the central part, which is above the finished opening 99, downward by means of a stamp and thus form the closure part 20.

Selbstverständlich kann die Fertigöffnung 99 einen anderen als runden Querschnitt aufweisen. Es eignen sich insbesondere auch dreieckige Querschnitte, da diese sich leicht öffnen lassen, wenn die Aufreisslasche 21 über einer Ecke hochgezogen und von der Siegelung abgeschält wird (Figur 6).Of course, the finished opening 99 can have a cross-section other than round. Triangular cross sections are also particularly suitable, since they can be easily opened if the tear-open tab 21 is pulled up over a corner and peeled off from the seal (FIG. 6).

Die äussere Gestalt des Deckels I, in Figur 6 ist ein rechteckiger dargestellt, ist für die Erfindung unwesentlich, da dieser erst nach Fertigstellung des Verschlusses aus dem Streifen 5 ausgestanzt und - falls notwendig - mit einem Rand 45 versehen wird.The outer shape of the cover I, a rectangular one in FIG. 6, is insignificant for the invention, since it is only punched out of the strip 5 after completion of the closure and - if necessary - provided with an edge 45.

Der Deckel I kann beispielsweise aus einem Streifen 5 aus einem der nachfolgend angegebenen Verbundmaterialien bestehen: 100 - 300 um Hart-PVC (Schicht 15)

  • 15 - 50 um Aluminium (Schicht 37)
  • 25 - 80 um LDPE (Schicht 39)
The cover I can consist, for example, of a strip 5 made of one of the composite materials specified below: 100-300 μm rigid PVC (layer 15)
  • 15 - 50 µm aluminum (layer 37)
  • 25-80 µm LDPE (layer 39)

Als Bindemittel zur Aluminiumschicht kann ein Kunstharz-Kaschierkleber oder ein Primer verwendet werden.A synthetic resin laminating adhesive or a primer can be used as a binder for the aluminum layer.

Die Aufreisslasche 21 kann beispielsweise aus dem folgenden Verbundmaterial hergestellt sein:The tear tab 21 can be made, for example, from the following composite material:

50 - 80 um hitzebeständig schutzlackierte Aluminiumfolie (aussen),

  • als Binder ein Primer,
  • 25 - 80 um LDPE und
  • eine Heissklebelackierung.
50 - 80 um heat-resistant protective lacquered aluminum foil (outside),
  • as a binder a primer,
  • 25 - 80 um LDPE and
  • a hot glue coating.

Es ist selbstverständlich möglich, die schälbare und die unlösbaren Verbindungen statt durch Versiegeln mit Wärme mit einem entsprechend wirkenden Kleber, der nicht erwärmt werden muss, zu erzeugen.It is of course possible to produce the peelable and the non-detachable connections instead of by sealing with heat with a correspondingly acting adhesive, which does not have to be heated.

Claims (11)

1. Method of producing a finished pour opening in a container cover formed from aluminium as a light and gas barrier and from plastics material as protective and sealing layers, having a cutting edge, which is protected from corrosion, along the punched rough opening, characterized in that
a) the rough opening (9) is punched-out;
b) a rolled flange (11) is produced along the rough opening (9) in such a manner that the cutting edge (19) abuts, or almost abuts, the root (17) of the rolled flange (11);
c) the rolled flange (11) is flattened in a calibration station (13), and an accurately defined, calibrated, finished opening (99) is produced; and
d) the rolled flange (11) is thereby flattened until the protective layer (15), which is applied to the cover (1), is displaced from the interior of the rolled flange (11) between the cutting edge (19) and the root (17) in such a manner that the edge (19) is covered with the displaced protective layer (15) and is sealed against corrosion.
2. Method according to claim 1, characterized in that the rough opening (9) is punched-out and the rolled flange (11) is produced by means of a first tool in the first work station (7), and the cutting edge (19) is calibrated, flattened and sealed by a second tool in the second work station (13).
3. Method according to claim 1 or 2, characterized in that a pull tab (21) is sealed onto the flattened rolled flange (11) in a third work station (18), which tab (21) is guided towards the finished opening (99) either on a supporting belt (27) or individually.
4. Method according to claim 3, characterized in that the central portion of the pull tab (21), situated above the finished opening (99), is forced downwardly when the pull tab (21) is being sealed onto the rolled flange (11), and it is deformed to form its insertable closure member.
5. Container cover, formed from aluminium as a light and gas barrier and from plastics material and serving as protective and sealing layers, for a container having a sealed-on pull tab above a pour or drink opening which is provided with a rolled flange, characterized in that the cross-section of the finished pour opening (99) is a calibrated cross-section, the rolled flange (11) has a flat sealing area (A) on at least the outer surface, and the cutting edge (19) of the rough opening (9) is covered by materials of the plastics layer (41) which were forced from the interior of the flange (11) when the latter was being flattened.
6. Container cover according to claim 5, characterized in that the cutting edge (19) is connected to the root (17) of the rolled flange (11) by means of the material of the plastics layer (41) which had emerged.
7. Container cover according to claim 5 or 6, characterized in that the pull tab (21) is detachably connected to the rolled flange (11) along the sealing area (A).
8. Container cover according to claim 7, characterized in that the pull tab (21) is easily detachably connected to the plastics layer (15) which forms the surface of the cover (1).
9. Container cover according to one of claims 5 to 8, characterized in that the central portion (20) of the pull tab (21), in the region of the finished opening (99), engages in said opening in a cup-shaped manner.
10. Container cover according to claim 9, characterized in that at least the layer (39), forming the lower surface of the cover (1), is heat-sealable, and the other layer (15) is formed from a thermoplastic plastics material.
11. Container cover according to one of claims 9 to 11, characterized in that a plastics component part is inserted into the cup-shaped portion (20) of the pull tab (21).
EP86810401A 1985-10-04 1986-09-04 Pour opening in a container cover with a pull tab , and production of this opening Expired EP0221842B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86810401T ATE47818T1 (en) 1985-10-04 1986-09-04 POUR OPENING IN A CONTAINER LID WITH TEAR TAP AND MAKING THIS OPENING.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH429385 1985-10-04
CH4293/85 1985-10-04

Publications (2)

Publication Number Publication Date
EP0221842A1 EP0221842A1 (en) 1987-05-13
EP0221842B1 true EP0221842B1 (en) 1989-11-08

Family

ID=4273396

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86810401A Expired EP0221842B1 (en) 1985-10-04 1986-09-04 Pour opening in a container cover with a pull tab , and production of this opening

Country Status (3)

Country Link
EP (1) EP0221842B1 (en)
AT (1) ATE47818T1 (en)
DE (1) DE3666792D1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5142512B2 (en) * 2006-12-04 2013-02-13 北海製罐株式会社 Can lid
FR3072660B1 (en) 2017-10-20 2019-11-22 Ardagh Mp Group Netherlands B.V. COVER FOR A METAL TANK, INCLUDING A METAL RING AND THERMOSCELLEE PELABLE MEMBRANE
JP7169521B2 (en) * 2019-02-28 2022-11-11 トヨタ自動車株式会社 Sealed batteries and assembled batteries

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2849164A (en) * 1955-12-16 1958-08-26 William C Weisgerber Dispensing cans
US3547305A (en) * 1968-11-15 1970-12-15 Continental Can Co Easy opening container
CH563284A5 (en) * 1972-05-20 1975-06-30 Hesser Ag Maschf
CH629983A5 (en) * 1978-06-06 1982-05-28 Alusuisse METHOD FOR PRODUCING LID RINGS FOR CAN CAN.
US4332846A (en) * 1980-01-28 1982-06-01 National Distillers & Chemical Corp. Can cover
CH654542A5 (en) * 1982-04-05 1986-02-28 Sandherr Packungen Ag LOCKING LID FOR STERILIZABLE CAN.
DE3321572A1 (en) * 1983-06-15 1984-12-20 Robert Bosch Gmbh, 7000 Stuttgart CONTAINER LID WITH OPENING DEVICE

Also Published As

Publication number Publication date
ATE47818T1 (en) 1989-11-15
DE3666792D1 (en) 1989-12-14
EP0221842A1 (en) 1987-05-13

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