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EP0160975A2 - Cold or heat sealable multilayer film for a packaging with a tearable and reclosable opening - Google Patents

Cold or heat sealable multilayer film for a packaging with a tearable and reclosable opening Download PDF

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Publication number
EP0160975A2
EP0160975A2 EP85105604A EP85105604A EP0160975A2 EP 0160975 A2 EP0160975 A2 EP 0160975A2 EP 85105604 A EP85105604 A EP 85105604A EP 85105604 A EP85105604 A EP 85105604A EP 0160975 A2 EP0160975 A2 EP 0160975A2
Authority
EP
European Patent Office
Prior art keywords
layer
cold
film according
multilayer film
cover layer
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
EP85105604A
Other languages
German (de)
French (fr)
Other versions
EP0160975A3 (en
EP0160975B1 (en
Inventor
Alfons Dr. Lamping
Beat Karth
Werner Hiltbrunner
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.)
Nyffeler Corti AG
Original Assignee
Nyffeler Corti 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 Nyffeler Corti AG filed Critical Nyffeler Corti AG
Publication of EP0160975A2 publication Critical patent/EP0160975A2/en
Publication of EP0160975A3 publication Critical patent/EP0160975A3/en
Application granted granted Critical
Publication of EP0160975B1 publication Critical patent/EP0160975B1/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
    • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/10—Container closures formed after filling
    • B65D77/20—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers
    • B65D77/2024—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers the cover being welded or adhered to the container
    • B65D77/2068—Means for reclosing the cover after its first opening
    • B65D77/2096—Adhesive means
    • 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
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/52—Details
    • 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
    • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/10—Container closures formed after filling
    • B65D77/20—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers
    • B65D77/2024—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers the cover being welded or adhered to the container
    • B65D77/2028—Means for opening the cover other than, or in addition to, a pull tab
    • B65D77/2032—Means for opening the cover other than, or in addition to, a pull tab by peeling or tearing the cover from the container
    • B65D77/2044—Means for opening the cover other than, or in addition to, a pull tab by peeling or tearing the cover from the container whereby a layer of the container or cover fails, e.g. cohesive failure
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1303—Paper containing [e.g., paperboard, cardboard, fiberboard, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1303—Paper containing [e.g., paperboard, cardboard, fiberboard, etc.]
    • Y10T428/1307—Bag or tubular film [e.g., pouch, flexible food casing, envelope, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1334—Nonself-supporting tubular film or bag [e.g., pouch, envelope, packet, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1334—Nonself-supporting tubular film or bag [e.g., pouch, envelope, packet, etc.]
    • Y10T428/1338—Elemental metal containing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1334—Nonself-supporting tubular film or bag [e.g., pouch, envelope, packet, etc.]
    • Y10T428/1341—Contains vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/1355—Elemental metal containing [e.g., substrate, foil, film, coating, etc.]
    • Y10T428/1359—Three or more layers [continuous layer]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/1379—Contains vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/14—Layer or component removable to expose adhesive
    • Y10T428/1424—Halogen containing compound
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/14—Layer or component removable to expose adhesive
    • Y10T428/1452—Polymer derived only from ethylenically unsaturated monomer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • Y10T428/2813—Heat or solvent activated or sealable
    • Y10T428/2817—Heat sealable
    • Y10T428/2826—Synthetic resin or polymer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • Y10T428/2848—Three or more layers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31725—Of polyamide
    • Y10T428/3175—Next to addition polymer from unsaturated monomer[s]
    • Y10T428/31757—Polymer of monoethylenically unsaturated hydrocarbon
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/3188—Next to cellulosic
    • Y10T428/31895—Paper or wood
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/3188—Next to cellulosic
    • Y10T428/31895—Paper or wood
    • Y10T428/31906—Ester, halide or nitrile of addition polymer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31909—Next to second addition polymer from unsaturated monomers
    • Y10T428/31913—Monoolefin polymer
    • Y10T428/31917—Next to polyene polymer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31909—Next to second addition polymer from unsaturated monomers
    • Y10T428/31913—Monoolefin polymer
    • Y10T428/3192—Next to vinyl or vinylidene chloride polymer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31909—Next to second addition polymer from unsaturated monomers
    • Y10T428/31924—Including polyene monomers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31935—Ester, halide or nitrile of addition polymer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31938—Polymer of monoethylenically unsaturated hydrocarbon

Definitions

  • the invention relates to a cold-sealable or heat-sealable multilayer film for reclosable packaging, which can be used both as a sealing membrane for preformed containers and even for the formation of containers, and which results in hermetically sealed closures during cold or heat sealing, which after being opened for the first time opens several times from ' Can be closed by hand.
  • Cold-sealable or heat-sealable multilayer films which serve as sealing membranes for containers or can even be formed into containers, are already known.
  • Conventional multilayer films of this type have the disadvantage that packaging made therefrom either cannot be closed again at all after opening, or at least cannot be simply put together by hand.
  • cold-sealable films can be closed by hand, but only with the use of relatively high pressure and only by pressing two cold-sealable coated surfaces against one another.
  • the cold seal coatings also have the disadvantage that they are slightly sticky and therefore cannot be brought into contact with any filling material, e.g. not with dusting goods.
  • the object of the invention is therefore to provide a cold or heat-sealable multilayer film for reclosable packaging which, after the cold or heat-seal connection has been opened for the first time, without any particular effort by simply pressing the opened part onto any point of the multilayer film or onto a suitable surface of another object , e.g. of the open container edge, can be closed one or more times.
  • the invention relates to a cold or heat-sealable multilayer film for reclosable packaging, which is characterized in that it has a permanent adhesive layer on a carrier film, which has a cover layer made of a material with low elongation at break and tear resistance on the side facing away from the carrier film.
  • This material can itself be cold-sealable or heat-sealable, so that no special sealing layer is required. Otherwise, a cold or heat seal layer made of conventional cold or heat seal media is applied to the cover layer.
  • the multilayer film shown in FIG. 1 consists of a carrier film 1, a permanently adhesive layer 2, a cover layer 3 and a sealing layer 4.
  • Suitable materials for the carrier film 1 are, for example, polyester, such as polyethylene terephthalate, polyamide, biaxially oriented polypropylene, cellophane, polyvinyl chloride, Metals, such as aluminum, and paper.
  • the permanently adhesive layer 2 consists, for example, of hot melt adhesives based on ethylene-vinyl acetate copolymers, styrene-butadiene-styrene block copolymers, styrene-isoprene-styrene block copolymers or polyacrylates or other suitable pressure-sensitive adhesives.
  • the cover layer 3 consists of a material with low elongation at break and tear resistance of a suitable layer thickness.
  • Preferred materials of this type are polyethylene, polypropylene, polyamide, polyvinyl chloride, polycarbonate, polystyrene, hot melts based on ethylene-vinyl acetate copolymers, cellular glass and metals such as aluminum.
  • cover layer 3 itself is sealable, as is the case with polyethylene, a separate seal layer is not necessary. Otherwise, a sealing layer 4 made of conventional cold or heat sealing media is applied to the cover layer.
  • a multilayer film of the type shown in Fig. 1 is used as a sealing membrane on the opening of a preformed container 5, e.g. of a cup, sealed and later completely or partially separated from the container edge with the aid of a tear-off tab, the cover layer 3 tears at the beginning of the opening process. As the sealing seam tears open, the covering layer 3 remains on the container edge due to its low tear resistance in the area of the sealing seam. The permanent adhesive layer 2 is thereby exposed. To close the container again, simply place the seam surfaces on top of each other and press them lightly against each other.
  • the multilayer film itself serves as packaging material for an object 6.
  • the packaging is shown in the unopened state in FIG. 2a, in the opened and reclosed state in FIG. 2b.
  • the multilayer film comprising a carrier film 1, a permanently adhesive layer 2, a covering layer 3 of a material of low elongation at break and tear propagation resistance, as well as optionally a seal layer 4.
  • a carrier film 1 a permanently adhesive layer 2
  • a covering layer 3 of a material of low elongation at break and tear propagation resistance as well as optionally a seal layer 4.
  • For the individual layers can ig same materials as in the embodiment of F. 1 can be used.
  • Fig. 2b a part of the packaged item, e.g. chocolate, already removed, and the folding closure is closed again at another point.
  • the covering layer 3 with an adhesive layer 5 on the side facing the permanently adhesive layer 2, in order to avoid cohesive failure of the layer 2 and to obtain a non-adhesive side of the torn seam.
  • Suitable abhesive materials for layer 5 are e.g. Silicones.
  • predetermined breaking points in the form of weakening lines can be created in the cover layer along the desired tear line, e.g. with the help of suitable sealing tools. This also makes it possible to keep the tearing force of the cover layer lower than the cohesive force of the sealing seam.
  • the carrier film of the multilayer film according to the invention is available for decorative purposes and can, for example be printed. This creates the possibility of using the multilayer film peeled off from the opened packaging due to its self-adhesive properties for other purposes, for example sticking it onto other substrates.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wrappers (AREA)
  • Laminated Bodies (AREA)
  • Packages (AREA)

Abstract

Eine kalt- oder heißsiegelbare Mehrschichtfolie umfaßt eine auf eine Trägerfolie aufgebrachte, permanent klebende Schicht, die auf der der Trägerfolie abgewandten Seite eine Abdeckschicht aus einem Material mit geringer Reißdehnung und Weiterreißfestigkeit aufweist. Sofern die Abdeckschicht nicht selbst kalt- oder heißsiegelbar ist, wird sie mit einer entsprechend Kalt- oder Heißsiegelschicht versehen. Die Mehrschichtfolie kann als Verschlußmembran für vorgeformte Behälter verwendet oder aber selbst zu Behältern geformt werden.A cold-sealable or heat-sealable multilayer film comprises a permanently adhesive layer applied to a carrier film and having a cover layer made of a material with low elongation at break and tear resistance on the side facing away from the carrier film. If the cover layer is not itself cold or heat sealable, it is provided with a corresponding cold or heat seal layer. The multilayer film can be used as a sealing membrane for preformed containers or can itself be shaped into containers.

Description

Die Erfindung betrifft eine kalt- oder heißsiegelbare Mehrschichtfolie für wiederverschließbare Verpackungen, die sowohl als Verschlußmembran für vorgeformte Behälter als auch selbst zur Formung von Behältern verwendet werden kann und bei der Kalt- oder Heißversiegelung hermetisch dichte Verschlüsse ergibt, die nach erstmaligem öffnen mehrmals wieder von'Hand verschlossen werden können.The invention relates to a cold-sealable or heat-sealable multilayer film for reclosable packaging, which can be used both as a sealing membrane for preformed containers and even for the formation of containers, and which results in hermetically sealed closures during cold or heat sealing, which after being opened for the first time opens several times from ' Can be closed by hand.

Kalt- oder heißsiegelbare Mehrschichtfolien, die als Verschlußmembranen für Behälter dienen oder selbst zu Behältern geformt werden können, sind bereits bekannt. Herkömmliche Mehrschichtfolien dieser Art haben jedoch den Nachteil, daß daraus hergestellte Verpackungen nach dem öffnen entweder überhaupt nicht wieder verschlossen werden können oder aber zumindest nicht durch einfaches Zusammenfügen von Hand. Kaltsiegelbare Folien lassen sich zwar bis zu einem gewissen Grad von Hand verschliessen, jedoch nur unter Anwendung von verhältnismäßig hohem Druck und nur durch Gegeneinanderpressen zweier kaltsiegelbar beschichteter Flächen. Den Kaltsiegelbeschichtungen haftet außerdem der Nachteil an, daß sie leicht klebrig sind und deshalb nicht mit jedem beliebigen Füllgut in Kontakt gebracht werden können, z.B. nicht mit stäubenden Gütern.Cold-sealable or heat-sealable multilayer films, which serve as sealing membranes for containers or can even be formed into containers, are already known. Conventional multilayer films of this type, however, have the disadvantage that packaging made therefrom either cannot be closed again at all after opening, or at least cannot be simply put together by hand. To a certain extent, cold-sealable films can be closed by hand, but only with the use of relatively high pressure and only by pressing two cold-sealable coated surfaces against one another. The cold seal coatings also have the disadvantage that they are slightly sticky and therefore cannot be brought into contact with any filling material, e.g. not with dusting goods.

Aufgabe der Erfindung ist es daher, eine kalt- oder heißsiegelbare Mehrschichtfolie für wiederverschließbare Verpackungen bereitzustellen, die nach erstmaligem öffnen der Kalt- oder Heißsiegelverbindung ohne besondere Kraftanstrengung durch einfaches Andrücken des geöffneten Teiles an eine beliebige Stelle der Mehrschichtfolie oder an eine geeignete Fläche eines anderen Gegenstandes, z.B. des offenen Behälterrandes, ein- bis mehrmals wieder verschlossen werden kann.The object of the invention is therefore to provide a cold or heat-sealable multilayer film for reclosable packaging which, after the cold or heat-seal connection has been opened for the first time, without any particular effort by simply pressing the opened part onto any point of the multilayer film or onto a suitable surface of another object , e.g. of the open container edge, can be closed one or more times.

Gegenstand der Erfindung ist eine kalt- oder heißsiegelbare Mehrschichtfolie für wiederverschließbare Verpackungen, die dadurch gekennzeichnet ist, daß sie auf einer Trägerfolie eine permanent klebende Schicht aufweist, die auf der der Trägerfolie abgewandten Seite eine Abdeckschicht aus einem Material mit geringer Reißdehnung und Weiterreißfestigkeit aufweist. Dieses Material kann selbst kalt-oder heißsiegelbar sein, so daß keine besondere Siegelschicht erforderlich ist. Andernfalls wird auf die Abdeckschicht eine Kalt- oder Heißsiegelschicht aus herkömmlichen Kalt- oder Heißsiegelmedien aufgebracht.The invention relates to a cold or heat-sealable multilayer film for reclosable packaging, which is characterized in that it has a permanent adhesive layer on a carrier film, which has a cover layer made of a material with low elongation at break and tear resistance on the side facing away from the carrier film. This material can itself be cold-sealable or heat-sealable, so that no special sealing layer is required. Otherwise, a cold or heat seal layer made of conventional cold or heat seal media is applied to the cover layer.

Im folgenden wird die Erfindung anhand bevorzugter Ausführungsformen unter Bezug auf die Zeichnung näher erläutert. Es zeigen:

  • Fig. 1 einen schematischen Querschnitt durch eine erfindungsgemäße Mehrschichtfolie in Form einer Verschlußmembran auf einem vorgeformten Behälter in teilweise geöffnetem Zustand;
  • Fig. 2a einen schematischen Querschnitt durch eine erfindungsgemäße Mehrschichtfolie, die selbst zum Verpacken eines Gegenstandes dient;
  • Fig. 2b einen schematischen Querschnitt durch die Verpackung von Fig. 2a, nachdem diese geöffnet und wieder verschlossen worden ist.
The invention is explained in more detail below on the basis of preferred embodiments with reference to the drawing. Show it:
  • Figure 1 is a schematic cross section through a multilayer film according to the invention in the form of a sealing membrane on a preformed container in a partially opened state.
  • 2a shows a schematic cross section through a multilayer film according to the invention, which itself serves for packaging an object;
  • Fig. 2b shows a schematic cross section through the package of Fig. 2a after it has been opened and closed again.

Die in Fig. 1 gezeigte Mehrschichtfolie besteht aus einer Trägerfolie 1, einer permanent klebenden Schicht 2, einer Abdeckschicht 3 und einer Siegelschicht 4.The multilayer film shown in FIG. 1 consists of a carrier film 1, a permanently adhesive layer 2, a cover layer 3 and a sealing layer 4.

Geeignete Materialien für die Trägerfolie 1 sind z.B. Polyester, wie Polyethylenterephthalat, Polyamid, biaxial orientiertes Polypropylen, Zellglas, Polyvinylchlorid, Metalle, wie Aluminium, und Papier.Suitable materials for the carrier film 1 are, for example, polyester, such as polyethylene terephthalate, polyamide, biaxially oriented polypropylene, cellophane, polyvinyl chloride, Metals, such as aluminum, and paper.

Die permanent klebende Schicht 2 besteht beispielsweise aus Heißschmelzklebern auf Basis von Ethylen-Vinylacetat-Copolymeren, Styrol-Butadien-Styrol-Blockcopolymeren, Styrol-Isopren-Styrol-Blockcopolymeren oder Polyacrylaten oder anderen geeigneten Haftklebstoffen.The permanently adhesive layer 2 consists, for example, of hot melt adhesives based on ethylene-vinyl acetate copolymers, styrene-butadiene-styrene block copolymers, styrene-isoprene-styrene block copolymers or polyacrylates or other suitable pressure-sensitive adhesives.

Die Abdeckschicht 3 besteht aus einem Material geringer Reißdehnung und Weiterreißfestigkeit von geeigneter Schichtdicke. Bevorzugte Materialien dieser Art sind Polyethylen, Polypropylen, Polyamid, Polyvinylchlorid, Polycarbonat, Polystyrol, Hot-melts auf Basis von Ethylen-Vinylacetat-Copolymeren, Zellglas und Metalle, wie Aluminium.The cover layer 3 consists of a material with low elongation at break and tear resistance of a suitable layer thickness. Preferred materials of this type are polyethylene, polypropylene, polyamide, polyvinyl chloride, polycarbonate, polystyrene, hot melts based on ethylene-vinyl acetate copolymers, cellular glass and metals such as aluminum.

Wenn das Material der Abdeckschicht 3 selbst siegelfähig ist, wie dies bei Polyethylen der Fall ist, erübrigt sich eine gesonderte Siegelschicht. Andernfalls wird auf die Abdeckschicht eine Siegelschicht 4 aus herkömmlichen Kalt-oder Heißsiegelmedien aufgebracht.If the material of the cover layer 3 itself is sealable, as is the case with polyethylene, a separate seal layer is not necessary. Otherwise, a sealing layer 4 made of conventional cold or heat sealing media is applied to the cover layer.

Wird eine Mehrschichtfolie der in Fig. 1 gezeigten Art als Verschlußmembran auf die öffnung eines vorgeformten Behälters 5, z.B. eines Bechers, aufgesiegelt und später mit Hilfe einer Abreißlasche ganz oder teilweise vom Behälterrand getrennt, so reißt zu Beginn des öffnungsvorgangs die Abdeckschicht 3 ein. Bei fortschreitendem Aufreißen der Siegelnaht bleibt die Abdeckschicht 3 infolge ihrer geringen Weiterreißfestigkeit im Bereich der Siegelnaht auf dem Behälterrand zurück. Dadurch wird die permanent klebende Schicht 2 freigelegt. Um den Behälter wieder zu verschließen, müssen lediglich die Nahtflächen wieder aufeinandergelegt und leicht gegeneinander gedrückt werden.If a multilayer film of the type shown in Fig. 1 is used as a sealing membrane on the opening of a preformed container 5, e.g. of a cup, sealed and later completely or partially separated from the container edge with the aid of a tear-off tab, the cover layer 3 tears at the beginning of the opening process. As the sealing seam tears open, the covering layer 3 remains on the container edge due to its low tear resistance in the area of the sealing seam. The permanent adhesive layer 2 is thereby exposed. To close the container again, simply place the seam surfaces on top of each other and press them lightly against each other.

Bei der in den Fig. 2a und 2b gezeigten Ausführungsform dient die Mehrschichtfolie selbst als Verpackungsmaterial für einen Gegenstand 6. In Fig. 2a ist die Verpackung im ungeöffneten Zustand, in Fig. 2b im geöffneten und wiederverschlossenen Zustand dargestellt.In the embodiment shown in FIGS. 2a and 2b the multilayer film itself serves as packaging material for an object 6. The packaging is shown in the unopened state in FIG. 2a, in the opened and reclosed state in FIG. 2b.

Auch bei dieser Ausführungsform umfaßt die Mehrschichtfolie eine Trägerfolie 1, eine permanent klebende Schicht 2, eine Abdeckschicht 3 aus einem Material von geringer Reißdehnung und Weiterreißfestigkeit sowie gegebenenfalls eine Siegelschicht 4. Für die einzelnen Schichten können dieselben Materialien wie bei der Ausführungsform von Fig. 1 verwendet werden.Also in this embodiment, the multilayer film comprising a carrier film 1, a permanently adhesive layer 2, a covering layer 3 of a material of low elongation at break and tear propagation resistance, as well as optionally a seal layer 4. For the individual layers can ig same materials as in the embodiment of F. 1 can be used.

In Fig. 2b ist ein Teil des verpackten Gegenstandes, z.B. Schokolade, bereits entnommen, und der Faltverschluß ist an einer anderen Stelle wieder verschlossen. In diesem Fall ist es von Vorteil, die Abdeckschicht 3 auf der der permanent klebenden Schicht 2 zugewandten Seite mit einer Abhäsivschicht 5 zu versehen, um einen Kohäsionsbruch der Schicht 2 zu vermeiden und eine nicht-klebende Seite der aufgerissenen Naht zu erhalten. Als Abhäsivmaterialien für die Schicht 5 eignen sich z.B. Silikone.In Fig. 2b a part of the packaged item, e.g. Chocolate, already removed, and the folding closure is closed again at another point. In this case, it is advantageous to provide the covering layer 3 with an adhesive layer 5 on the side facing the permanently adhesive layer 2, in order to avoid cohesive failure of the layer 2 and to obtain a non-adhesive side of the torn seam. Suitable abhesive materials for layer 5 are e.g. Silicones.

Bei allen vorstehend beschriebenen Ausführungsformen und insbesondere in Anwendungsfällen, bei denen die Mehrschichtfolie größeren mechanischen Belastungen standhalten muß, können in der Abdeckschicht entlang der gewünschten Aufreißlinie Sollbruchstellen in Form von Schwächungslinien erzeugt werden, z.B. mit Hilfe von geeigneten Siegelwerkzeugen. Hierdurch gelingt es zusätzlich, die Aufreißkraft der Abdeckschicht niedriger als die Kohäsionskraft der Siegelnaht zu halten.In all the embodiments described above and in particular in applications in which the multilayer film has to withstand greater mechanical loads, predetermined breaking points in the form of weakening lines can be created in the cover layer along the desired tear line, e.g. with the help of suitable sealing tools. This also makes it possible to keep the tearing force of the cover layer lower than the cohesive force of the sealing seam.

Die Trägerfolie der erfindungsgemäßen Mehrschichtfolie steht für dekorative Zwecke zur Verfügung und kann z.B. bedruckt werden. Dies schafft die Möglichkeit, die von der geöffneten Verpackung abgezogene Mehrschichtfolie aufgrund ihrer selbstklebenden Eigenschaften für andere Zwecke zu verwenden, sie z.B. auf andere Substrate aufzukleben.The carrier film of the multilayer film according to the invention is available for decorative purposes and can, for example be printed. This creates the possibility of using the multilayer film peeled off from the opened packaging due to its self-adhesive properties for other purposes, for example sticking it onto other substrates.

Claims (9)

1. Kalt- oder heißsiegelbare Mehrschichtfolie für wiederverschließbare Verpackungen, gekennzeichnet durch eine auf eine Trägerfolie aufgebrachte, permament klebende Schicht, die auf der der Trägerfolie abgewandten Seite eine Abdeckschicht aus einem Material mit geringerer Reißdehnung und Weiterreißfestigkeit aufweist1. Cold or heat-sealable multilayer film for reclosable packaging, characterized by a permanent adhesive layer applied to a carrier film, which on the side facing away from the carrier film has a cover layer made of a material with lower elongation at break and tear resistance 2. Mehrschichtfolie nach Anspruch 1, dadurch gekennzeichnet daß auf die Abdeckschicht eine Kalt- oder Heißsiegelschicht aufgebracht ist.2. Multi-layer film according to claim 1, characterized in that a cold or heat seal layer is applied to the cover layer. 3. Mehrschichtfolie nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß sie zwischen der permanent klebenden Schicht und der Abdeckschicht eine Abhäsivschicht aufweist.3. Multi-layer film according to claim 1 or 2, characterized in that it has an adhesive layer between the permanent adhesive layer and the cover layer. 4. Mehrschichtfolie nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Trägerfolie aus Polyester, Polyamid, Polyvinylchlorid, biaxial orientiertem Polypropylen, Zellglas, Aluminium oder Papier besteht.4. Multi-layer film according to one of claims 1 to 3, characterized in that the carrier film consists of polyester, polyamide, polyvinyl chloride, biaxially oriented polypropylene, cellular glass, aluminum or paper. 5. Mehrschichtfolie nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die permanent klebende Schicht aus einem Haftkleber besteht.5. Multi-layer film according to one of claims 1 to 4, characterized in that the permanent adhesive layer consists of a pressure sensitive adhesive. 6. Mehrschichtfolie nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Abdeckschicht aus Polyethylen, Polypropylen, Polyamid, Polyvinylchlorid, Poly- carbonat, Polystyrol, Hot-melts, Zellglas oder Aluminium besteht.6. The multilayer film of any one of claims 1 to 5, characterized in that the covering layer of polyethylene, polypropylene, polyamide, polyvinyl chloride, P oly- carbonate, polystyrene, hot-melts, cellophane or aluminum. 7. Mehrschichtfolie nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß sie die Form einer Verschlußmembran für vorgeformte Behälter hat.7. Multi-layer film according to one of claims 1 to 6, characterized in that it has the shape of a ver closing membrane for preformed containers. 8. Mehrschichtfolie nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß sie selbst zu einem Behälter geformt ist.8. Multi-layer film according to one of claims 1 to 6, characterized in that it is itself shaped into a container. 9. Mehrschichtfolie nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die Abdeckschicht entlang der vorgesehenen Aufreißlinie Sollbruchstellen in Form von Schwächungslinien aufweist.9. Multi-layer film according to one of claims 1 to 8, characterized in that the cover layer has predetermined breaking points in the form of lines of weakness along the intended tear line.
EP85105604A 1984-05-07 1985-05-07 Cold or heat sealable multilayer film for a packaging with a tearable and reclosable opening Expired - Lifetime EP0160975B1 (en)

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DE3416755 1984-05-07
DE19843416755 DE3416755A1 (en) 1984-05-07 1984-05-07 COLD OR HOT-SEALABLE MULTILAYER FILM FOR RE-SEALABLE PACKAGING

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US4673601A (en) 1987-06-16
EP0160975A3 (en) 1987-04-15
DE3416755A1 (en) 1985-11-07
EP0160975B1 (en) 1990-03-28

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