EP0321394B1 - Closing unit made of tin-plate, process for making it and container provided with such a closing unit - Google Patents

Closing unit made of tin-plate, process for making it and container provided with such a closing unit 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)
French (fr)
Other versions
EP0321394A1 (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 AT88810796T priority Critical patent/ATE72188T1/en
Publication of EP0321394A1 publication Critical patent/EP0321394A1/en
Application granted granted Critical
Publication of EP0321394B1 publication Critical patent/EP0321394B1/en
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.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Cartons (AREA)
  • Vehicle Step Arrangements And Article Storage (AREA)
  • Making Paper Articles (AREA)

Abstract

The closure unit can be manufactured in a single deep-drawing operation. During the course of a predetermined stroke of the single deep-drawing operation, such as the downward stroke up to a lower dead-center position, a blank is punched out, a ring or marginal rim and a collar are formed, a central opening is punched out and a section extending peripherally to the cut edge is downwardly extended. During the upward stroke predetermined sections of the extended collar are rolled and subsequently squeezed together.

Description

Gegenstand der vorliegenden Erfindung ist eine Verschlusseinheit aus Blech für sterilisierbare Behälter gemäss Oberbegriff des Patentanspruches 1.The present invention relates to a closure unit made of sheet metal for sterilisable containers according to the preamble of patent claim 1.

Gegenstand der Erfindung ist weiter ein Verfahren zur Herstellung einer Verschlusseinheit aus Blech gemäss Oberbegriff des Patentanspruches 6.The invention further relates to a method for producing a closure unit from sheet metal according to the preamble of patent claim 6.

Gegenstand der vorliegenden Erfindung ist auch ein Behälter mit einer Verschlusseinheit aus Blech.The present invention also relates to a container with a closure unit made of sheet metal.

Verschlusseinheiten der genannten Gattung mit einer die Behälteröffnung überspannenden, vom Haltering der Verschlusseinheit abschälbaren Membrane finden Verwendung auf Gebinden zur Verpackung von Lebensmitteln und technischen Produkten.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.

Aus der US-Patentschrift 4,253,584 ist eine solche Verschlusseinheit mit einem Deckelring für eine Konservendose aus beschichtetem Aluminium oder Weissblech bekannt. Zum Schutz der durch das Ausstanzen der Ausschüttöffnung freigelegten ungeschützten Schnittkante wird diese nach oben und aussen in die Siegelebene für die Membran umgelegt. Die ungeschützte Schnittkante befindet sich nun ausserhalb des Füllgutes und kann dieses nicht kontaminieren. Ein Schutz vor Korrosion durch äussere Einflüsse, z.B. beim Abfüllen des Behälters oder durch Feuchtigkeit der Luft, ist nicht gewährleistet.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. To protect the unprotected cut edge exposed by punching out the pouring opening, it is folded upwards and outwards into the sealing plane for the membrane. 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.

Zur Erhöhung der Festigkeit des entlang der Schüttöffnung gebildeten Siegelrandes wird entlang der Oeffnung durch die umgelegte Schnittkante ein hohler Randwulst gebildet. Dieser hohle Randwulst bewirkt aber, dass beim Aufsiegeln der Membrane auf die Oeffnung die Versiegelung nur auf der schmalen, ausserhalb des hohlen Wulstes befindlichen Ringfläche mit dem notwendigen hohen Siegeldruck erfolgen kann; im Bereich des hohlen Wulstes können die Siegelfläche und die aufzusiegelnde Membrane nicht in genügendem Masse gegeneinander gepresst werden, damit ein sicherer, für die Sterilisation geeigneter Verschluss entsteht.To increase the strength of the sealing edge formed along the pouring opening, a hollow bead is formed along the opening through the folded cutting edge. However, 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.

Dieser bekannte Deckelring hat weiter den Nachteil, dass beim Aufbördeln des Ringes auf einen Behälterrand die meist wenige Hunderstelmillimeter dicke Membrane und insbesondere die gegen das Zentrum auf die Oberfläche der Membrane zurückgelegte Aufreisslasche durch die Relativbewegung des Andrucktellers der Bördelmaschine zu Beginn des Bördelvorganges dermassen beschädigt werden kann, dass ein Aufreissen der Membrane danach nicht mehr gewährleistet ist.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.

Aus der englischen Patentanmeldung 2166409 ist weiter eine Verschlusseinheit bekannt, welche ähnlich der oben genannten amerikanischen im Bereich der Oeffnung einen hohlen Randwulst aufweist, der beim Aufsiegeln der Membrane ebenfalls verhindert, dass die Membrane auf der gesamten Siegelfläche sterilisationsfest mit dem Deckelring verbunden werden kann.From the English patent application 2166409, a closure unit is also known 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.

Zur Verhinderung der Beschädigung der Aufreisslasche durch den Andruck der Bördelmaschine wird die Lasche zweifach umgelegt derart, dass durch die Bördelmaschine höchstens eine Schicht beschädigt und die darunterliegende den Bördelvorgang unbeschädigt überstehen kann.To prevent the tear-open tab from being damaged by the pressure of the flanging machine, 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.

Aus der Schweizer Patentschrift 563 284 ist weiter eine Verschlusseinheit für Verpackungsbehälter bekannt, bei der die Membrane auf die nach oben und aussen umgelegte Schnittkante der Behälteröffnung aufgesiegelt wird. Dadurch dass die Behälteröffnung im zentralen Teil der Verschlusseinheit angeordnet und in einem Abstand von deren mit der Dose zu verbindenden Rand angeordnet ist, kann verhindert werden, dass die Aufreisslasche beim Aufdeckeln verletzt wird. Die Schnittkante ist hingegen gegen Korrosion nicht geschützt.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. By opening the container Arranged in the central part of the closure unit and arranged at a distance from its edge to be connected to the can, the tear-open tab can be prevented from being damaged when the lid is opened. The cut edge, however, is not protected against corrosion.

Behälter mit einer nicht den gesamten Behälterquerschnitt überspannenden Ausschüttöffnung eignen sich nicht für die Verpackung von Lebensmitteln, insbesondere sind sie unbrauchbar für die Verpackung von Lebensmitteln, die nicht schüttfähig sondern formfest sind.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.

Aus der europäischen Patentanmeldung 0090957 ist weiter ein Verschlussdeckel für sterilisierbare Dosen bekannt, bei dem die Schnittkante der Oeffnung ebenfalls nach oben und aussen in die Ebene der Siegelfläche umgelegt ist. Die Siegelflache wird dabei nicht nur vom umgelegten Abschnitt gebildet, sondern der peripher ausserhalb der Schnittkante liegende Bereich der Endfläche ist durch Tiefziehen derart verformt, dass dessen Oberfläche in der Ebene der umgelegten Schnittkante zu liegen kommt und dadurch eine Vergrösserung der Siegelflache erlangt wird.From European patent application 0090957 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.

Auch dieser Verschlussdeckel hat den Nachteil, dass die Aufreisslasche durch den Andruckteller der Bördelmaschine beschädigt werden kann. Zudem bedingt die zweiteilige Siegelfläche, dass beide Seiten des Behälters mit einem siegelfähigen Lack beschichtet sein müssen.This closure cover also has the disadvantage that the pull tab can be damaged by the pressure plate of the flanging machine. In addition, the two-part sealing surface means that both sides of the container must be coated with a sealable lacquer.

Hier will die Erfindung Abhilfe schaffen.The invention seeks to remedy this.

Die Erfindung, wie sie in den Ansprüchen 1 bis 5 gekennzeichnet ist, löst die Aufgabe, eine Verschlusseinheit aus Blech für sterilisierbare Behälter zu schaffen, bei der die ungeschützte Schnittkante der Oeffnung weder durch das Füllgut noch durch äussere Einflüsse korrodieren kann und bei der der Querschnitt der nutzbaren Schüttöffnung durch die Siegelfläche im wesentlichen nur um den Betrag der Siegelfläche verkleinert wird. Eine weitere Aufgabe der Erfindung besteht darin, die Verschlusseinheit derart auszubilden, dass die Aufreisslasche an der Membrane durch den rotierenden Andruckteller der Bördelmaschine nicht beschädigt werden kann.The invention, as characterized in claims 1 to 5, 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.

Die Erfindung, wie sie in den Ansprüchen 6 bis 9 gekennzeichnet ist, löst auch die Aufgabe, ein Verfahren zu schaffen, mit dem eine Verschlusseinheit mit geschützter Schnittkante erzeugt werden kann.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.

Überraschenderweise gelingt es mit der erfindungsgemässen Verschlusseinheit, einen einwandfreien Schutz der Schnittkante sowohl gegen Einflüsse von innen als auch von aussen zu erlangen, ohne dass dazu ein zusätzlicher korrosionsfester Überzug angebracht werden muss. Gleichzeitig gelingt es, im wesentlichen die gesamte Ringfläche als Siegelflache nutzbar zu machen, da kein eine einwandfreie Versiegelung verhindernder Rollrand vorhanden ist. Die drei satt aneinander anliegenden und, je nach Art der Beschichtung, miteinander verklebten Abschnitte bilden eine formstabile, im wesentlichen 100%-ig nutzbare Siegelfläche für die Verschlussmembran.Surprisingly, with 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.

Der hochgezogene periphere Scheitel des Faltbereiches der beiden oberen Abschnitte verhindert eine Beschädigung der auf der Membran liegenden Aufreisslasche, ohne dabei den Bördelvorgang auf herkömmlichen Maschinen zu behindern. Der hochgezogene Faltenbereich bewirkt zudem eine einfache präzise Zentrierung der Membran vor dem Siegeln und verhindert das unbeabsichtigte Ansiegeln derselben am kragenförmigen Teil der Verschlusseinheit. Eine einwandfreie Voraussetzung für ein sicheres Ablösen der Membrane wird dadurch geschaffen.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.

Das erfindungsgemässe Verfahren ermöglicht die Herstellung der Verschlusseinheit in einem einzigen, sämtliche Verformungen und Schnitte beinhaltenden Tiefziehhub.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.

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

Figur 1
einen Querschnitt durch den Bördelrand und die Siegelfläche einer Verschlusseinheit und
Figuren 2-7
die Verformungsstufen während der Herstellung der Verschlusseinheit

The invention is explained in more detail on the basis of illustrated exemplary embodiments. Show it:
Figure 1
a cross section through the flanged edge and the sealing surface of a closure unit and
Figures 2-7
the stages of deformation during the manufacture of the closure unit

Die Verschlusseinheit 1 weist einen auf einen Gebinderand 2 aufbördelbaren Haltering 3 und eine Ringfläche 5 zum Aufsiegeln einer Verschlussmembran 7 auf. In der Figur 1 hat der Haltering 3 eine Gestalt wie die für die Herstellung einer Bördelverbindung mit dem in gebrochenen Linien dargestellten Bördelrand 2 eines Behälters 11 aus Weissblech vorliegt. Bei Behältern aus Aluminium, Kunststoff, Papier oder einem Verbund aus verschiedenen Materialien kann der Rand 3 des Halteringes eine von der in den Figuren dargestellten Gestalt abweichende aufweisen. An der Membrane 7 ist eine Aufreisslasche 13 angebracht, die nach oben umgebogen und auf die Oberfläche der Membrane 7 umgelegt worden ist.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. In FIG. 1, 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. In the case of containers made of aluminum, plastic, paper or a composite of different materials, 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.

Ueber der Ringfläche 5, die zur Aufsiegelung der Membrane 7 dient, ist ebenfalls in gebrochenen Linien andeutungsweise der rotierende Andruckteller 15 einer Bördelmaschine dargestellt.Above the annular surface 5, which is used to seal the membrane 7, the rotating pressure plate 15 of a flanging machine is also shown in broken lines.

Die Schnittkante 17, entstanden bei der Ausstanzung des zentralen Teiles der Verschlusseinheit 1 zur Bildung einer Entnahme- oder Schüttöffnung 19 liegt geschützt zwischen den Abschnitten 21, 23 der Verschlusseinheit 1. Die Abschnitte 21, 23 sowie der an die Schnittkante anschliessende Abschnitt 25 werden, wie später im Einzelnen erläutert, durch Einrollen des an die Schnittkante 17 anschliessenden, radial aussenliegenden Bereiches 10 der Verschlusseinheit 1 und durch nachträgliches Zusammendrücken erzeugt. Nach dem Zusammendrücken liegen die drei Abschnitte 21, 23, 25 wie aus Figur 1 ersichtlich parallel zueinander und sich gegenseitig berührend.The cut edge 17, formed during the punching out of the central part of the closure unit 1 to form a removal or pouring opening 19, is protected between the sections 21, 23 of the closure unit 1. 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.

Der periphere Umlege- oder Faltbereich 27 der Abschnitte 23 und 27 ist nach oben umgebogen, derart, dass der Scheitel S um den Betrag b höher zu liegen kommt als die die Ringfläche 5 bildende Oberfläche des Abschnittes 23. Der Abstand b ist dabei grösser als die doppelte Dicke 2s der Verschlussmembrane 7.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.

Anhand der Figuren 2 bis 7 wird nachfolgend ein möglicher Herstellungsweg der Verschlusseinheit 1 erklärt. Aus einem Blechband 4 oder aus einer Blechplatte werden die Zuschnitte für die Verschlusseinheit 1 ausgestanzt und anschliessend durch Tiefziehen mit einem Bördelrand 3 versehen, der je nach Gestalt des Randes 2 des Behälters 11 entsprechend ausgebildet sein kann.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.

In einem zweiten Schritt wird eine Rondelle 9 zur Bildung der zentralen Ausschnittöffnung 19 ausgestanzt (Fig. 3) und der periphere Abschnitt 10 zylinderförmig nach unten umgelegt. Der zylindrische Abschnitt 10 wird anschliessend eingerollt bis die Schnittkante 17 in Anlage mit dem Kragen 6 unterhalb dem Bördelrand 3 gelangt und spiralförmig dem nun vollständig geschlossenen Wulst 18 entlang weitergeleitet, bis der Wulst 18 etwa zur Hälfte eine Überlappung aufweist (in gebrochenen Linien in Fig. 6). Der Wulst 18 wird nun so lange zusammengequetscht, bis die drei Abschnitte 21, 25, 23 flach und satt aufeinanderliegen. Die Verformungsschritte gemäss den Figuren 2 bis 5 erfolgen auf dem Weg des Werkzeuges bis zum unteren Totpunkt; die Verformungsschritte gemäss den Figuren 6 und 7 beim Aufwärtshub.In a second step, 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.

Vorzugsweise reicht das Verformungs- oder Quetschwerkzeug 22 nicht ganz bis zum Kragen oder Abschnitt 6 am Haltering 3, so dass die periphere Falte 27 zwischen den Abschnitten 23 und 25 nach oben umgelegt und deren Scheitel S um den Betrag b über der die Siegelfläche bildenden Oberfläche des Abschnittes 25 zu liegen kommt.Preferably, 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.

Der Haltering 2 kann aus Aluminium, Weiss- oder TFS- (Tin Free Steel) Blech hergestellt werden. Die Aussenseite (in Figur 2 oben) weist, falls notwendig, eine Schutzschicht gegen Korrosion durch die Umweltbedingungen aus Polypropylenfilm oder einem anderen Schutzlack auf. Eine Verträglichkeit mit dem Füllgut muss nicht geprüft werden, da die Aussenbeschichtung an keiner Stelle in Kontakt mit dem Inhalt gelangen kann.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.

Die Innenseite (in Figur 2 unten) weist vorzugsweise eine siegelfähige Beschichtung auf, da sie die Klebe- oder Siegelfläche für die Membrane 7 zu bilden hat und allenfalls, wenn diese aus Kunststoff besteht, auch beim Aufbördeln der Verschlusseinheit eine abdichtende Funktion anstelle eines separat eingespritzten Componds 20 übernimmt.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.

Als Beschichtungen können z.B. Polypropylen, ein Kunststoffilm oder ein anderer siegelfähiger Lack verwendet werden.As coatings e.g. Polypropylene, a plastic film or another sealable lacquer can be used.

Claims (10)

1. Sheet metal closure for sterilisable containers (11), comprising a retainer ring (3), which is flange-mountable on the container (11) and has an annular or sealing surface (5) for the sealing-on of a diaphragm (7), which spans the closable opening (19) and has a pull tab (13), the cut edge (17) of the closable opening (19) being folded into the annular surface (5), characterised in that the annular surface (5) comprises three portions of material (21, 23, 25), which lie above one another in a substantially parallel manner and are folded together, and the cut edge (17) is disposed between the portion (23) forming the sealing surface (5) and the lower portion (21).
2. Closure according to claim 1, characterised in that the three portions (21, 23, 25), which lie above one another, completely abut against one another in a flat manner in the overlapping region with the diaphragm (7).
3. Closure according to one of claims 1 or 2, characterised in that the cut edge (17) terminates at the base of the fold between the upper and lower portions (23, 21).
4. Closure according to one of claims 1 to 3, characterised in that the peripherally disposed fold (27) of the two upper portions (23, 25) is bent upwardly.
5. Closure according to claim 4, characterised in that the top (S) of the fold (27) lies above the annular surface (5) by an amount (b) which is greater than twice the thickness (s) of the diaphragm (7).
6. Method of producing a sheet metal closure (1) with a retainer ring (3) and an annular surface (5), which surrounds the central opening (19), comprising three portions (21, 23, 25), which lie flat above one another and are folded together, for the sealing-on of a diaphragm (7), characterised in that all of the deformations and stampings of the blank (4), which forms the closure (1), are effected in one single deep-drawing operation.
7. Method according to claim 6, characterised in that
a)   the blank for the closure (1) is punched-out;
b)   a retainer ring (3) is moulded-on peripherally, and the central section is drawn-out in a cup-shaped manner;
c)   the opening (19) is punched out of the base of the cup-shaped section;
d)   the portions (21, 23, 25) are rolled-up; and
e)   are pressed flat.

8. Method according to claim 7, characterised in that an opening (19) of smaller diameter than the opening in the cup-shaped section is punched-out, and the surrounding annular surface, comprising the portions (21, 23, 25), is drawn-out cylindrically.
9. Method according to one of claims 7 or 8, characterised in that the rolled-up portions (21, 23, 25) are only pressed flat in the central region, and the peripherally situated fold (27) is folded upwardly.
10. Container having a closure, produced in accordance with the method according to claim 6.
EP88810796A 1987-12-14 1988-11-21 Closing unit made of tin-plate, process for making it and container provided with such a closing unit Expired - Lifetime EP0321394B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88810796T ATE72188T1 (en) 1987-12-14 1988-11-21 SHEET METAL CAP UNIT, METHOD OF MANUFACTURE THEREOF AND CONTAINER WITH A CAP UNIT.

Applications Claiming Priority (2)

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

Publications (2)

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

Family

ID=4283938

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88810796A Expired - Lifetime EP0321394B1 (en) 1987-12-14 1988-11-21 Closing unit made of tin-plate, process for making it and container provided with such a closing unit

Country Status (7)

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

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EP0990590A1 (en) * 1998-10-02 2000-04-05 Union Deutsche Lebensmittelwerke GmbH Can
US6601727B2 (en) 2000-11-09 2003-08-05 Rasselstein Hoesch Gmbh Can lid
DE10197223B4 (en) * 2001-03-29 2013-04-18 Industrias Alimentarias De Navarra, S.A. Gasket for preserves, in particular preserves

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DE29609130U1 (en) * 1996-05-21 1997-09-18 Rasselstein Hoesch GmbH, 56564 Neuwied Easy to open can lid
DE19714982C2 (en) * 1997-04-10 1999-03-25 Alcan Rorschach Ag Process for producing a closure ring with a circumferential sealing surface for sealing a closure membrane and a flange edge for applying the closure ring to the edge of a container, and ring produced according to the method
AU6565600A (en) * 1999-07-22 2001-02-13 Alcan Rorschach A.G. Sealing ring, comprising a sealing diaphragm and production of the same
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US6601727B2 (en) 2000-11-09 2003-08-05 Rasselstein Hoesch Gmbh Can lid
DE10197223B4 (en) * 2001-03-29 2013-04-18 Industrias Alimentarias De Navarra, S.A. Gasket for preserves, in particular preserves

Also Published As

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

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