EP0064948A2 - Method of making lids with a closing strip which covers at least one pouring hole, particularly for beverage cans - Google Patents

Method of making lids with a closing strip which covers at least one pouring hole, particularly for beverage cans Download PDF

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Publication number
EP0064948A2
EP0064948A2 EP82810184A EP82810184A EP0064948A2 EP 0064948 A2 EP0064948 A2 EP 0064948A2 EP 82810184 A EP82810184 A EP 82810184A EP 82810184 A EP82810184 A EP 82810184A EP 0064948 A2 EP0064948 A2 EP 0064948A2
Authority
EP
European Patent Office
Prior art keywords
hole
adhesive primer
lid
sealing strip
strip
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.)
Granted
Application number
EP82810184A
Other languages
German (de)
French (fr)
Other versions
EP0064948B1 (en
EP0064948A3 (en
Inventor
Oldrich Stanek
Siegfried Bloeck
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.)
Alcan Holdings Switzerland AG
Original Assignee
Alusuisse Holdings AG
Schweizerische Aluminium 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 Alusuisse Holdings AG, Schweizerische Aluminium AG filed Critical Alusuisse Holdings AG
Priority to AT82810184T priority Critical patent/ATE21077T1/en
Publication of EP0064948A2 publication Critical patent/EP0064948A2/en
Publication of EP0064948A3 publication Critical patent/EP0064948A3/en
Application granted granted Critical
Publication of EP0064948B1 publication Critical patent/EP0064948B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/56—Three layers or more
    • B05D7/58—No clear coat specified
    • B05D7/584—No clear coat specified at least some layers being let to dry, at least partially, before applying the next layer
    • 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
    • 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
    • B65D17/505—Flexible tape or foil-like material applied to the external and internal part of the container wall
    • 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
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2202/00—Metallic substrate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2202/00—Metallic substrate
    • B05D2202/20—Metallic substrate based on light metals
    • B05D2202/25—Metallic substrate based on light metals based on Al
    • 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
    • B65D2517/5008—Details of flexible tape or foil-like material with a sealing coat
    • 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
    • B65D2517/5072—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

Definitions

  • the present invention relates to a method for producing lids, in particular for beverage cans.
  • lids are mostly made of aluminum (pure aluminum or aluminum alloy), tinplate or tin-free steel (TFS) and are usually provided with a protective lacquer layer on their inner surfaces, e.g. coated on a phenol-epoxy basis.
  • sealing strips advantageously consist of an aluminum foil with a thickness of approximately 0.9-0.14 mm, the surface of which is to be sealed with a coating of a thermoplastic material, for example with a thickness of approximately 0.015 to 0.03 mm, usually approximately 0.02 mm, is coated, the aluminum surface usually being provided with a thinner phenol-epoxy lacquer layer before the plastic layer is applied.
  • the strip On the outside, the strip is usually still covered with a decorative varnish. strips made of an aluminum-polyamide laminate, especially with a polyamide 12 coating, have proven very successful.
  • the lid material is in tape form or painted in panels and from this the lids are made, in which the pouring and possibly the air holes are punched out. As a result, the cut edges of these holes remain unprotected.
  • the object of the present invention is to remedy this deficiency in the case of lids with punched holes which are covered by a sealed sealing strip and to create lids which are not attacked by the filling material at the cut edges of the holes.
  • This object is achieved in accordance with the method according to the invention in that after the sealing strip has been sealed, its free-standing surface corresponding to the holes and the surface of the lid material surrounding the holes are treated with an adhesive primer from the inside of the lid, this adhesive primer is then dried apply a layer of plastisol to the inner surface of the lid prepared in this way and have it gelled by heat treatment.
  • This heat treatment can at 130 to 175 0 C for 5 sec. To 15 min. for example in an air circulating oven, with infrared radiation or with similar known means.
  • the thickness of the applied plastisol layer is preferably 0.1 to 0.25 mm.
  • Epoxidized polymethyl methacrylate in particular, has proven to be a good adhesive primer.
  • other polyacrylic esters in particular polymethacrylic esters, especially in their epoxidized form, can also be used for this purpose.
  • Such adhesive primers are preferably applied as a 0.05 to 0.5% solution in suitable solvents, for example by spraying, in such an amount that the adhesive primer layer has a thickness of 0.05 to 15, preferably 0.1 up to 2 g per m 2 .
  • suitable solvents for example by spraying, in such an amount that the adhesive primer layer has a thickness of 0.05 to 15, preferably 0.1 up to 2 g per m 2 .
  • methyl ethyl ketone can be used as the solvent for the epoxidizedoolyacrylic esters.
  • the primer solution dries relatively quickly on the inside of the lid. If necessary, the drying process can e.g. accelerate with a warm air shower.
  • the described pretreatment of the area of the lid inner surfaces mentioned has the effect that the plastisol coating adheres perfectly not only to the lacquered surface of the lid material, but also to the exposed plastic coating, in particular the polyamide coating of the sealing strip.
  • the plastisol layer had poor adhesion, especially on the free-standing surface of a sealing strip made of an aluminum-polyamide laminate tet, so that when the strip is torn away, it separates from the plastisol film and this film continues to close the hole (windowing effect), or that pieces of the plastisol film remain on the edge of the hole (feathering), which is unsightly.
  • the area of the sealing strip corresponding to the pouring hole is often embossed with e.g. provided in the form of regularly arranged elevations and depressions.
  • the plastisol in particular can be applied with a stamp-like tool with a work surface lying on one level, thereby ensuring that this application is actually carried out regularly over the entire desired area.
  • the above-mentioned tool can e.g. look like a brush and have a number of steel pins, which are enclosed at one end in a carrier plate, with their shafts penetrate a perforated bottom of a chamber for the plastisol and their flattened tips lie in one and the same plane and form the work surface.
  • the shafts of the pins are conical in the area of the perforated base in such a way that they close the base holes when the tool is at rest.
  • the pins are pushed back through the carrier plate, whereby the holes open and the plastisol flows under pressure along the pins onto the surface to be coated.
  • the illustrated lid 1 (e.g. for beverage cans, in particular beer cans) consists, for example, of tin-free steel and has a drop-shaped pouring or drinking hole 2, the longitudinal axis of which extends radially with respect to the lid.
  • This pouring hole 2 with cutting edge 3 is closed by a sealed sealing strip 4, consisting of an aluminum thin strip 5 with a polyamide 12 coating 6.
  • the width of the sealing seam 7 around the hole is approximately 1 to 2 mm.
  • the strip also has a free-standing grip tab 8 on which the strip can be gripped to be torn away. This tab and the area of the closure strip corresponding to the hole are provided with an embossing 9.
  • the strip material In the area of the hole, the strip material is pushed into the hole in such a way that the inner surface of the strip comes to lie approximately in the same plane as the inner surface of the lid.
  • This area and the surrounding area of the lid material are pre-treated on the inside with the adhesive primer and completely covered with a PVC plastisol layer 10.
  • n modification thereof and in particular in the case of larger pouring holes, it is also possible to only cover the cut edge 3 and its vicinity with the plastisol and to leave the middle part of the area of the sealing strip spanning the hole uncovered.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Closures For Containers (AREA)
  • Containers Opened By Tearing Frangible Portions (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

Bei Deckeln aus Aluminiumlegierungen oder Eisenmaterial wie Weissblech oder zinnfreiem Stahl mit mindestens einem ausgestanzten Ausgiessloch und gegebenenfalls mindestens ein Luftloch, welche Löcher durch einen heissaufgesiegelten, wegreissbaren Verschlussstreifen agbedeckt sind, wird auf die Deckelinnenseite der Bereich der Löcher 2 mit einem Haftprimer vorbehandelt und darauf mit einer Plastisol-Beschichtung 10 versehen, wodurch die Schnittkanten 3 der Löcher vor einem Angriff durch das Füllgut geschützt werden.In the case of lids made of aluminum alloys or iron material such as tinplate or tin-free steel with at least one punched-out pouring hole and possibly at least one air hole, which holes are covered by a heat-sealed, tear-off sealing strip, the area of the holes 2 is pretreated on the inside of the lid with an adhesive primer and then with a Plastisol coating 10 provided, whereby the cut edges 3 of the holes are protected from attack by the product.

Description

Die vorliegende Erfindung bezieht sich auf ein Verfahren zur Herstellung von Deckeln insbesondere für Getränkedosen. Solche Deckel werden meistens aus Aluminium (Reinaluminium oder Aluminiumlegierung), Weissblech oder zinnfreiem Stahl (tin free steel, TFS) hergestellt und sind üblicherweise mindestens auf ihren Innenflächen mit einer Schutzlackschicht z.B. auf Phenol-Epoxid-Basis überzogen.The present invention relates to a method for producing lids, in particular for beverage cans. Such lids are mostly made of aluminum (pure aluminum or aluminum alloy), tinplate or tin-free steel (TFS) and are usually provided with a protective lacquer layer on their inner surfaces, e.g. coated on a phenol-epoxy basis.

Es ist bekannt, solche Deckel mit einem Ausgiessloch bzw. einer Ausgiesslöchergruppe und gegebenenfalls mit mindestens einem Luftloch zu versehen.It is known to provide such covers with a pouring hole or a pouring hole group and, if appropriate, with at least one air hole.

Diese Löcher werden dann durch einen aufgesiegelten und wegreissbaren Verschlussstreifen zugedeckt. Solche Verschlussstreifen bestehen vorteilhafterweise aus einer Aluminiumfolie mit einer Dicke von etwa 0,9 - 0,14 mm, die auf ihre zu versiegelnde Fläche mit einem Ueberzug aus einem thermoplastischem Kunststoff z.B.. mit einer Dicke von etwa 0,015 bis 0,03 mm, üblicherweise etwa 0,02 mm, überzogen ist, wobei meistens vor dem Aufbringen der Kunststoffschicht die Aluminiumoberfläche zunächst mit einer dünneren Phenol-Epoxid-Lackschicht versehen ist. Auf der Aussenseite ist der Streifen üblicherweise noch mit einer Dekorationslackierung überzogen. Sehr bewährt haben sich Streifen aus einem Aluminium-Polyamid-Laminat, insbesondere mit Polyamid-12-Beschichtung.These holes are then covered by a sealed and tear-away sealing strip. Such sealing strips advantageously consist of an aluminum foil with a thickness of approximately 0.9-0.14 mm, the surface of which is to be sealed with a coating of a thermoplastic material, for example with a thickness of approximately 0.015 to 0.03 mm, usually approximately 0.02 mm, is coated, the aluminum surface usually being provided with a thinner phenol-epoxy lacquer layer before the plastic layer is applied. On the outside, the strip is usually still covered with a decorative varnish. Strips made of an aluminum-polyamide laminate, especially with a polyamide 12 coating, have proven very successful.

Aus Fabrikationsgründen wird das Deckelmaterial in Bandform oder in Tafeln lackiert und hieraus werden die Deckel gefertigt, in welchen dann die Ausgiess- und gegebenenfalls die Luftlöcher ausgestanzt werden. Dies hat zur Folge, dass die Schnittkanten dieser Löcher ungeschützt bleiben.For manufacturing reasons, the lid material is in tape form or painted in panels and from this the lids are made, in which the pouring and possibly the air holes are punched out. As a result, the cut edges of these holes remain unprotected.

Diese ungeschützten Schnittkanten der Löcher sind abträglich, da sie unter dem Einfluss des Füllgutes insbesondere eines C02-haltigen Füllgutes einem Korrosionsangriff unterworfen sind, wobei die Korrosionsprokukte zu einem Verderb des Füllgutes führen können. Solche Erscheinungen treten in mässigem Umfang bereits bei Deckeln aus Aluminiumlegierungen, im vergrösserten Masse aber bei Deckeln aus Eisenmaterial (Weissblech oder TFS) hervor. Z.B. wird Bier bereits bei einem Eisengehalt von 1 mg Fe-Ionen pro Liter und manche Cola-Getränke bei 1,5 mg Fe pro Liter trüb.These unprotected cut edges of the holes are detrimental, since under the influence of the filling material, in particular a filling material containing CO 2 , they are subject to a corrosion attack, the corrosion products being able to spoil the filling material. Such phenomena occur to a moderate extent already with lids made of aluminum alloys, but to an increased extent with lids made of iron material (tinplate or TFS). For example, beer already becomes cloudy with an iron content of 1 mg Fe ions per liter and some cola drinks with 1.5 mg Fe per liter.

Aufgabe der vorliegenden Erfindung ist es, bei Deckeln mit ausgestanzten Löchern, die durch einen aufgesiegelten Verschlussstreifen abgedeckt werden, diesen Mangel zu beheben und derartige Deckel zu schaffen, welche an den Schnittkanten der Löcher durch das Füllgut nicht angegriffen werden.The object of the present invention is to remedy this deficiency in the case of lids with punched holes which are covered by a sealed sealing strip and to create lids which are not attacked by the filling material at the cut edges of the holes.

Diese Aufgabe wird nach dem erfindungsgemässen Verfahren dadurch gelöst, dass man nach dem Aufsiegeln des Verschlussstreifens, dessen den Löchern'entsprechende freistehende Oberfläche sowie die die Löcher umgebende Fläche des Deckelmaterials von der Innenseite des Deckels her mit einem Haftprimer behandelt, diesen Haftprimer trocknet, worauf man auf die so vorbereitete Deckelinnenfläche eine Plastisolschicht aufträgt, und diese durch eine Wärmebehandlung gelieren lässt.This object is achieved in accordance with the method according to the invention in that after the sealing strip has been sealed, its free-standing surface corresponding to the holes and the surface of the lid material surrounding the holes are treated with an adhesive primer from the inside of the lid, this adhesive primer is then dried apply a layer of plastisol to the inner surface of the lid prepared in this way and have it gelled by heat treatment.

Diese Wärmebehandlung kann bei 130 bis 1750C während 5 sec. bis 15 min. z.B. in einem Luftumwälzofen, mit Infrarotstrahlung oder mit ähnlichen bekannten Mitteln vorgenommen werden. Die Dicke der aufgetragenen Plastisolschicht beträgt vorzugsweise 0,1 bis 0,25 mm.This heat treatment can at 130 to 175 0 C for 5 sec. To 15 min. for example in an air circulating oven, with infrared radiation or with similar known means. The thickness of the applied plastisol layer is preferably 0.1 to 0.25 mm.

Als Haftprimer hat sich vor allem epoxidiertes Polymethylmethacrylat als günstig erwiesen. Zu diesem Zweck können aber auch weitere Polyacrylester, insbesondere Polymethacrylester, vor allem in ihrer epoxydierten Form verwendet werden.Epoxidized polymethyl methacrylate, in particular, has proven to be a good adhesive primer. However, other polyacrylic esters, in particular polymethacrylic esters, especially in their epoxidized form, can also be used for this purpose.

Solche Haftprimer werden vorzugsweise als 0,05 bis 0,5%-ige Lösung in geeigneten Lösungsmitteln, z.B. durch Aufspritzen, aufgetragen, und zwar in einer solchen Menge, dass die Haftprimerschicht eine Dicke von 0,05 bis 15, vorzugsweise von 0,1 bis 2 g pro m2, aufweist. Für die epoxidiertenoolyacrylester kann z.B. Methyläthylketon als Lösungsmittel verwendet werden.Such adhesive primers are preferably applied as a 0.05 to 0.5% solution in suitable solvents, for example by spraying, in such an amount that the adhesive primer layer has a thickness of 0.05 to 15, preferably 0.1 up to 2 g per m 2 . For example, methyl ethyl ketone can be used as the solvent for the epoxidizedoolyacrylic esters.

Auf der Deckelinnenfläche trocknet die Haftprimerlösung relativ schnell. Wenn nötig kann man den Trocknungsvorgang z.B. mit einer Warmluftdusche beschleunigen.The primer solution dries relatively quickly on the inside of the lid. If necessary, the drying process can e.g. accelerate with a warm air shower.

Die geschilderte Vorbehandlung des genannten Bereichs der Deckelinnenflächen wirkt sich dahingehend aus, dass der Plastisol-Ueberzug nicht nur an der lackierten Oberfläche des Deckelmaterials, sondern ebenfalls am freiliegenden Kunststoff-Ueberzug, insbesondere Polyamid-Ueberzug des Verschlussstreif,ens einwandfrei haftet.The described pretreatment of the area of the lid inner surfaces mentioned has the effect that the plastisol coating adheres perfectly not only to the lacquered surface of the lid material, but also to the exposed plastic coating, in particular the polyamide coating of the sealing strip.

Damit wird erreicht, dass jede Gefahr eines Unterwanderns des Füllgutes zwischen Plastisolschicht und Verschlussstreifen bis zur Schnittkante eliminiert wird, ferner dass beim Wegreissen des Verschlussstreifens der auf ihm haftende Bereich der Plastisolbeschichtung einwandfrei bis zu der Lochkante mitgerissen wird.This ensures that any danger of the filling material between the plastisol layer and the sealing strip being undermined up to the cut edge is eliminated, and that when the sealing strip is torn away, the area of the plastisol coating adhering to it is properly carried away to the perforated edge.

Es wurde nämlich bei Vorversuchen festgestellt, dass ohne diese Vorbehandlung mit einem Haftprimer diePlastisolschicht vor allem auf der freistehenden Oberfläche eines Verschlussstreifens aus einem Aluminium-Polyamid-Laminat schlecht haftet, so dass beim Wegreissen des Streifens dieser sich vom Plastisolfilm trennt und dieser Film das Loch weiterhin schliesst (Windowing-Effekt), bzw. dass am Lochrand Fetzen des Plastisolfilms hängen bleiben (feathering), was unansehnlich ist.It was namely found in preliminary tests that without this pretreatment with an adhesive primer, the plastisol layer had poor adhesion, especially on the free-standing surface of a sealing strip made of an aluminum-polyamide laminate tet, so that when the strip is torn away, it separates from the plastisol film and this film continues to close the hole (windowing effect), or that pieces of the plastisol film remain on the edge of the hole (feathering), which is unsightly.

Im weiteren wird oftmals der dem Ausgiessloch entsprechende Flächenbereich des Verschlussstreifens mit einer Prägung z.B. in Form von regelmäsesig angeordneten Erhöhungen und Vertiefungen versehen.Furthermore, the area of the sealing strip corresponding to the pouring hole is often embossed with e.g. provided in the form of regularly arranged elevations and depressions.

Falls bei dem Prägevorgang Verletzungen oder Schwächungen des Kunststoff- insb. des Polyamid-Ueberzugs entstehen sollten, so werden diese Stellen durch die Plastisolschicht zugedeckt. Wiederum ist dies vor allem von Bedeutung, wenn solche Streifen auf Deckeln aus Weissblech oder zinnfreiem Stahl eingesetzt werden, weil dann die Korrosionsgefahr durch Bildung von galvanischen Elementen bestehen kann, dies im Gegensatz zur Verwendung von Aluminiumdeckelh.If injuries or weakenings of the plastic, in particular of the polyamide coating, occur during the embossing process, these areas are covered by the plastisol layer. Again, this is particularly important if such strips are used on covers made of tinplate or tin-free steel, because then there is a risk of corrosion due to the formation of galvanic elements, in contrast to the use of aluminum covers.

Für einen einwandfreien Kantenschutz mit Plastisol wird eine gute Voraussetzung geschafft, wenn dieses bis zur Siegelnaht gelangt. Daher wird zweckmässigerweise die Siegelnaht so gelegt, dass sie bis zur Lochkante reicht. Damit wird verhindert, dass Lufttaschen zwischen der Plastisolschicht und der Siegelnaht eingeschlossen werden.A good prerequisite is created for perfect edge protection with plastisol if it reaches the sealed seam. It is therefore advisable to place the sealing seam so that it extends to the edge of the hole. This prevents air pockets from being trapped between the plastisol layer and the sealed seam.

Nach einer Weiterbildung der Erfindung hat es sich als vorteilhaft erwiesen, vor dem Auftragen des Plastisols vorzugsweise bereits vor dem Auftragen des Haftprimers den das Loch abdeckenden Bereich des Verschlussstreifens in das Loch einzudrücken, derart, dass die Streifeninnenfläche etwa in derselben Ebene wie die eigentliche Deckelinnenfläche zu liegen kommt, wodurch in der Nähe der Schnittkante eine leichte Vertiefung, entsprechend der Dicke des Deckelmaterials, entsteht. Vorteil davon ist es, dass vor allem das Plastisol mit einem stempelartigen Werkzeug mit in einer Ebene liegender Arbeitsfläche aufgetragen werden kann und dabei gewährt wird, dass dieser Auftrag tatsächlich regelmässig auf dem ganzen gewünschten Bereich erfolgt. Beim Heisssiegeln des Verschlussstreifens kommt es nämlich oft vor, dass dessen das Deckelloch überspannende Bereich infolge der Temperaturgradienten nicht glatt bleibt, sondern sich mehr oder weniger nach aussen oder nach innen unregelmässig ausbeult. Für die Beschichtung mit dem Plastisol sind solche unregelmässigen Verformungen ungünstig, vor allem, wenn sich auf der Deckelinnenseite eine muldenförmige Vertiefung gebildet hat, in welche die aufgetragene Plastisolmenge zusammenlaufen kann, wodurch der angestrebte Schutz der Schnittkanten nicht mehr mit Sicherheit gewährleistet wird. Solche unerwünschten Verformungsarten werden durch das beschriebene Eindrücken des Streifens in das Deckelloch vermieden.According to a development of the invention, it has proven to be advantageous to press the area of the sealing strip covering the hole into the hole before the plastisol is applied, preferably before the adhesive primer is applied, such that the inner surface of the strip is approximately in the same plane as the actual inner surface of the cover lie comes, which creates a slight depression near the cut edge, corresponding to the thickness of the lid material. The advantage of this is that the plastisol in particular can be applied with a stamp-like tool with a work surface lying on one level, thereby ensuring that this application is actually carried out regularly over the entire desired area. When the sealing strip is heat-sealed, it often happens that its area spanning the cover hole does not remain smooth as a result of the temperature gradients, but bulges more or less irregularly outwards or inwards. Such irregular deformations are disadvantageous for coating with the plastisol, especially if a trough-shaped depression has formed on the inside of the lid, into which the amount of plastisol applied can converge, as a result of which the desired protection of the cut edges is no longer guaranteed with certainty. Such undesirable types of deformation are avoided by the described pressing of the strip into the cover hole.

Das vorerwähnte Werkzeug kann z.B. wie eine Bürste aussehen und eine Anzahl Stahlstifte aufweisen, die an einem Ende in einer Trägerplatte eingefasst sind, mit ihrem Schaft einen durchlochten Boden einer Kammer für das Plastisol durchdringgen und deren abgeflachte Spitzen in ein und derselben Ebene liegen und die Arbeitsfläche bilden. Dabei sind die Schafte der Stifte im Bereich des gelochten Bodens konisch ausgebildet, derart, dass sie die Bodenlöcher im Ruhezustand des Werkzeugs verschliessen. Für einen Beschichtungsvorganr werden die Stifte durch die Trägerplatte zurückverschoben, wodurch sich die Löcher öffnen und das Plastisol unter Druck entlang der Stifte auf die zu beschichtende Oberfläche ausfliesst.The above-mentioned tool can e.g. look like a brush and have a number of steel pins, which are enclosed at one end in a carrier plate, with their shafts penetrate a perforated bottom of a chamber for the plastisol and their flattened tips lie in one and the same plane and form the work surface. The shafts of the pins are conical in the area of the perforated base in such a way that they close the base holes when the tool is at rest. For a coating process, the pins are pushed back through the carrier plate, whereby the holes open and the plastisol flows under pressure along the pins onto the surface to be coated.

Ein Ausführungsbeispiel der Erfindung ist in den Figuren abgebildet: es zeigen

  • Fig. l: Einen Deckel mit gestanztem Ausgiessloch
  • Fig. 2: Einen Deckel mit aufgesiegeltem Verschlussstreifen
  • Fig. 3: Den Deckel nach Fig. 2 von der Innenseite gesehen, mit der Plastisolbeschichtung.
  • Fig. 4: Den Deckel im Querschnitt
An embodiment of the invention is shown in the figures: show it
  • Fig. L: A lid with a punched pouring hole
  • F ig. 2: A lid with the sealing strip sealed on
  • F ig. 3: The lid according to FIG. 2 seen from the inside, with the plastisol coating.
  • Fig. 4: The lid in cross section

Der abgebildete Deckel 1 (z.B. für Getränkedosen, insb. Bierdosen), besteht zum Beispiel aus zinnfreiem Stahl und weist ein tropfenförmiges Ausgiess-, bzw. Trinkloch 2, dessen Längsachse in Bezug auf den Deckel radial verläuft.The illustrated lid 1 (e.g. for beverage cans, in particular beer cans) consists, for example, of tin-free steel and has a drop-shaped pouring or drinking hole 2, the longitudinal axis of which extends radially with respect to the lid.

Dieses Ausgiessloch 2 mit Schnittkante 3 ist durch einen aufgesiegelten Verschlussstreifen 4 geschlossen, bestehend aus einem Aluminiumdünnband 5 mit Polyamid-12-Ueberzug 6. Rings um das Loch beträgt die Breite der Siegelnaht 7 etwa 1 bis 2 mm. Der Streifen weist ferner eine freistehende GriffLasche 8 an der der Streifen zum Wegreissen angefasst werden kann. Diese Lasche sowie der dem Loch entsprechende Bereich les Verschlussstreifens sind mit einer Prägung 9 versehen.This pouring hole 2 with cutting edge 3 is closed by a sealed sealing strip 4, consisting of an aluminum thin strip 5 with a polyamide 12 coating 6. The width of the sealing seam 7 around the hole is approximately 1 to 2 mm. The strip also has a free-standing grip tab 8 on which the strip can be gripped to be torn away. This tab and the area of the closure strip corresponding to the hole are provided with an embossing 9.

lm Bereich des Loches ist das Streifenmaterial ins Loch eingeirückt, derart, dass die Innenoberfläche des Streifens etwa .n der selben Ebene wie die Deckelinnenoberfläche zu liegen kommt. Dieser Bereich sowie der Umgebungsbereich des Deckelmaterials sind auf der Innenseite mit dem Haftprimer vorbenandelt und mit einer PVC-Plastisolschicht 10 vollständig ubgedeckt.In the area of the hole, the strip material is pushed into the hole in such a way that the inner surface of the strip comes to lie approximately in the same plane as the inner surface of the lid. This area and the surrounding area of the lid material are pre-treated on the inside with the adhesive primer and completely covered with a PVC plastisol layer 10.

:n Abwandlung-davon, und insbesondere bei grösseren Ausgiess- .öchern, ist es auch möglich, lediglich die Schnittkante 3 und deren Nähe mit dem Plastisol abzudecken und den mittleven Teil des das Loch überspannenden Bereichs des Verschlussstreifens unbedeckt zu belassen.: n modification thereof, and in particular in the case of larger pouring holes, it is also possible to only cover the cut edge 3 and its vicinity with the plastisol and to leave the middle part of the area of the sealing strip spanning the hole uncovered.

Claims (8)

1. Verfahren zur Herstellung eines Dosendeckels mit mindestens einem durch einen aufgesiegelten Verschlussstreifen verschlossenen Ausgiessloch und gegebenenfalls mindestens einem Luftloch,
dadurch gekennzeichnet,
dass man nach Aufsiegeln des eine Siegelfläche aus Polyamid aufweisenden Verschlussstreifens dessen Innenfläche sowie den umgebenden Bereich der Innenfläche des Deckelmaterials mit einem aus einer Lösung eines Polyacrylesters bestehenden Haftprimer vorbehandelt, diesen Haftprimer trocknet und auf den so vorbereiteten Bereich der Deckelinnenfläche eine Plastisolschicht aufträgt und durch eine Wärmebehandlung gelieren lässt.1. Method for producing a can lid with at least one pouring hole closed by a sealed sealing strip and optionally at least one air hole,
characterized,
that after sealing the sealing strip having a sealing surface made of polyamide, its inner surface and the surrounding area of the inner surface of the lid material are pretreated with an adhesive primer consisting of a solution of a polyacrylic ester, this adhesive primer is dried and a plastisol layer is applied to the area of the inner lid surface prepared in this way and by heat treatment jellies. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Haftprimer aus einer Lösung eines Polymethacrylesters insbesondere von Polymethylmethacrylat besteht.2. The method according to claim 1, characterized in that the adhesive primer consists of a solution of a polymethacrylic ester, in particular of polymethyl methacrylate. 3. Verfahren nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, dass die Polyacrylester, bzw. Polymethylester bzw. das Polymethylmethacrylat in ihrer epoxidierten Form eingesetzt werden.3. The method according to any one of claims 1 and 2, characterized in that the polyacrylic esters or polymethyl esters or the polymethyl methacrylate are used in their epoxidized form. 4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass man die Wärmebehandlung der aufgetragenen Plastisolschicht bei 130 bis 1750C während 5 sec. bis 15 min. durchführt.4. The method according to any one of claims 1 to 3, characterized in that the heat treatment of the applied plastisol layer at 130 to 175 0 C for 5 sec. To 15 min. carries out. 5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Haftprimer-Lösung in einer solchen Menge aufgetragen wird, dass die verbleibende Haftprimerschicht eine Dicke von 0,05 bis 15, vorzugsweise 0,1 bis 2 g pro m2 aufweist.5. The method according to any one of claims 1 to 4, characterized in that the adhesive primer solution is applied in such an amount that the remaining adhesive primer layer has a thickness of 0.05 to 15, preferably 0.1 to 2 g per m 2 . 6. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass vor dem Auftragen der Plastisolschicht, vorzugsweise bereits vor der Vorbehandlung mit dem Haftprimer den dem Loch entsprechenden Bereich des Verschlussstreifens in das Loch eingedrückt wird, derart, dass die Innenoberfläche des Streifens etwa in der Ebene der Deckelinnenoberfläche zu liegen kommt.6. The method according to claim 1, characterized in that before the application of the plastisol layer, preferably before the pretreatment with the adhesive primer, the region of the sealing strip corresponding to the hole is pressed into the hole such that the inner surface of the strip is approximately in the plane of the The inner surface of the lid comes to rest. 7. Verfahren nach einem der Ansprüche 1 bis 6, dadurch-gekennzeichnet, dass beim Aufsiegeln des Verschlussstreifens die Siegelnaht so angeordnet wird, dass sie bis zur Lochkante reicht.7. The method according to any one of claims 1 to 6, characterized in that when the sealing strip is sealed, the sealing seam is arranged so that it extends to the edge of the hole. 8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass der Verschlussstreifen aus Aluminiumdünnband mit heissiegelfähiger Polyamidbeschichtung, insbesondere aus Polyamid-12, besteht.8. The method according to any one of claims 1 to 7, characterized in that the sealing strip consists of thin aluminum strip with a heat-sealable polyamide coating, in particular of polyamide-12.
EP82810184A 1981-05-07 1982-05-03 Method of making lids with a closing strip which covers at least one pouring hole, particularly for beverage cans Expired EP0064948B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82810184T ATE21077T1 (en) 1981-05-07 1982-05-03 PROCESS FOR THE MANUFACTURE OF LIDS WITH A CLOSING STRIP COVERING AT LEAST ONE POURING HOLE, ESPECIALLY FOR BEVERAGE CANS.

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH2962/81A CH653929A5 (en) 1981-05-07 1981-05-07 METHOD FOR PRODUCING A CAN LID WITH AT LEAST ONE POUR HOLE CLOSED BY A SEALED SEALING STRIP.
CH2962/81 1981-05-07
DE3118639A DE3118639C2 (en) 1981-05-07 1981-05-11 Method of manufacturing a metal can lid with a pouring hole and sealing strip therefor

Publications (3)

Publication Number Publication Date
EP0064948A2 true EP0064948A2 (en) 1982-11-17
EP0064948A3 EP0064948A3 (en) 1983-06-01
EP0064948B1 EP0064948B1 (en) 1986-07-30

Family

ID=25691838

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82810184A Expired EP0064948B1 (en) 1981-05-07 1982-05-03 Method of making lids with a closing strip which covers at least one pouring hole, particularly for beverage cans

Country Status (5)

Country Link
US (1) US4461605A (en)
EP (1) EP0064948B1 (en)
JP (1) JPS57194948A (en)
CH (1) CH653929A5 (en)
DE (1) DE3118639C2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0088725A2 (en) * 1982-03-05 1983-09-14 Schweizerische Aluminium Ag Method of manufacturing a can closure
WO2008107323A1 (en) * 2007-03-02 2008-09-12 Crown Packaging Technology, Inc Metal containers

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3233106C2 (en) * 1982-09-02 1986-01-09 Schweizerische Aluminium Ag, Chippis Method of making a can end
US4562936A (en) * 1985-02-12 1986-01-07 The Procter & Gamble Company Easy-open laminated container with optional reclosing means and method of making
USRE33893E (en) * 1985-08-27 1992-04-21 Minnesota Mining And Manufacturing Company Reclosable closure assembly for container
US4781323A (en) * 1985-08-27 1988-11-01 Minnesota Mining And Manufacturing Company Reclosable closure assembly for container
DE3824949A1 (en) * 1988-07-22 1990-01-25 Becker Emil & Adolf Gmbh Co Gearing for sectional or roller shutter doors
US4946061A (en) * 1989-09-25 1990-08-07 Shell Oil Company Reclosable opening device for a container
US5103550A (en) * 1989-12-26 1992-04-14 Aluminum Company Of America Method of making a food or beverage container
US5692635A (en) * 1990-06-06 1997-12-02 American National Can Company Easy open closure
US5622745A (en) * 1994-11-16 1997-04-22 The West Company, Incorporated Method of reducing particulates from metal closures
DE10108009A1 (en) * 2001-02-20 2002-08-29 Schmalbach Lubeca lid cover
MX2013012320A (en) * 2011-04-20 2014-05-27 Dayton Systems Group Inc Seal for elevated temperature applications and method of forming same.
ES2810864T3 (en) * 2017-04-05 2021-03-09 Gregor Anton Piech Metal can lid
JP7242193B2 (en) * 2018-04-27 2023-03-20 大和製罐株式会社 Tubs, can lids and methods of manufacturing can lids

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3339788A (en) * 1965-10-22 1967-09-05 Nat Can Corp Container
GB1219989A (en) * 1968-05-22 1971-01-20 Alfred Kenneth Unsworth Can ends
DE2114961A1 (en) * 1970-06-08 1971-12-16 Continental Can Co., Inc., New York, N.Y. (V.StA.) Easy-to-open container, especially a can, and a method for its manufacture
FR2203742A1 (en) * 1972-10-18 1974-05-17 Rausing Anders
US4170314A (en) * 1978-10-11 1979-10-09 The Continental Group, Inc. Container closure

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE644299A (en) * 1963-02-25
US3292828A (en) * 1964-09-17 1966-12-20 Nat Can Corp Easy opening can end
US3981652A (en) * 1974-08-05 1976-09-21 Usm Corporation Machine for partly coating articles
DE2519709B2 (en) * 1974-09-18 1979-07-12 The Continental Group, Inc., New York, N.Y. (V.St.A.) opening device on a cover, in particular made of metal, and a method for its production
US4311741A (en) * 1978-03-30 1982-01-19 Minnesota Mining And Manufacturing Company Polyester films with improved processability and tear resistance
US4215791A (en) * 1979-08-06 1980-08-05 Minnesota Mining And Manufacturing Company Easy open closure system
CA1172995A (en) * 1981-03-02 1984-08-21 Hiroshi Ueno Easily openable vessel closure and process for preparation thereof
US4378074A (en) * 1981-05-18 1983-03-29 Minnesota Mining And Manufacturing Company Easy open closure system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3339788A (en) * 1965-10-22 1967-09-05 Nat Can Corp Container
GB1219989A (en) * 1968-05-22 1971-01-20 Alfred Kenneth Unsworth Can ends
DE2114961A1 (en) * 1970-06-08 1971-12-16 Continental Can Co., Inc., New York, N.Y. (V.StA.) Easy-to-open container, especially a can, and a method for its manufacture
FR2203742A1 (en) * 1972-10-18 1974-05-17 Rausing Anders
US4170314A (en) * 1978-10-11 1979-10-09 The Continental Group, Inc. Container closure

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0088725A2 (en) * 1982-03-05 1983-09-14 Schweizerische Aluminium Ag Method of manufacturing a can closure
EP0088725A3 (en) * 1982-03-05 1984-05-09 Schweizerische Aluminium Ag Method of manufacturing a can closure
WO2008107323A1 (en) * 2007-03-02 2008-09-12 Crown Packaging Technology, Inc Metal containers

Also Published As

Publication number Publication date
US4461605A (en) 1984-07-24
EP0064948B1 (en) 1986-07-30
DE3118639C2 (en) 1986-03-27
CH653929A5 (en) 1986-01-31
EP0064948A3 (en) 1983-06-01
JPS57194948A (en) 1982-11-30
DE3118639A1 (en) 1982-11-18

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