EP1912865B1 - Reclosable microwave-suitable packaging - Google Patents

Reclosable microwave-suitable packaging Download PDF

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Publication number
EP1912865B1
EP1912865B1 EP06805636A EP06805636A EP1912865B1 EP 1912865 B1 EP1912865 B1 EP 1912865B1 EP 06805636 A EP06805636 A EP 06805636A EP 06805636 A EP06805636 A EP 06805636A EP 1912865 B1 EP1912865 B1 EP 1912865B1
Authority
EP
European Patent Office
Prior art keywords
micro
perforation
packaging
packaging according
area
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.)
Not-in-force
Application number
EP06805636A
Other languages
German (de)
French (fr)
Other versions
EP1912865A2 (en
Inventor
Friedrich Kastner
Stefan Zoister
Gyula Madai
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.)
Mondi AG
Original Assignee
Mondi 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 Mondi AG filed Critical Mondi AG
Priority to PL06805636T priority Critical patent/PL1912865T3/en
Priority to SI200630643T priority patent/SI1912865T1/en
Publication of EP1912865A2 publication Critical patent/EP1912865A2/en
Application granted granted Critical
Publication of EP1912865B1 publication Critical patent/EP1912865B1/en
Priority to CY20101100564T priority patent/CY1110110T1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B65D77/22—Details
    • B65D77/225—Pressure relief-valves incorporated in a container wall, e.g. valves comprising at least one elastic element
    • 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
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package
    • B65D81/3446—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package specially adapted to be heated by microwaves
    • B65D81/3461—Flexible containers, e.g. bags, pouches, envelopes
    • 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
    • B65D2205/00—Venting means
    • B65D2205/02—Venting holes
    • 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
    • B65D2205/00—Venting means
    • B65D2205/02—Venting holes
    • B65D2205/025—Venting holes having a removable label, sticker or adhesive foil covering the hole
    • 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
    • B65D2581/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D2581/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within
    • B65D2581/3437—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within specially adapted to be heated by microwaves
    • B65D2581/3439—Means for affecting the heating or cooking properties
    • B65D2581/345—Chemical browning agents or aroma adding agents, e.g. smoked flavour

Definitions

  • the invention relates to a package for food, ready meals, animal feed, non-food products, such as cold-hot packs, packaged refreshment wipes, detergents, cleaning agents and the like, which is suitable for use in the microwave, in the oven or in a water bath.
  • non-food products such as cold-hot packs, packaged refreshment wipes, detergents, cleaning agents and the like
  • Packaging is understood to be rigid, semi-rigid or flexible packaging. Such packages tend to burst or rupture due to the expansion of content and expansion of air and gases associated with heating. To a limited extent, this risk can be reduced by using packaging that is significantly larger than the volume of the product. Furthermore, the water present in the product is converted into steam when heated. This steam can not or hardly escape through the usual sealed packaging, so it is not possible crispy heating of ready meals.
  • a package which has a multilayer structure.
  • the outer layer and the inner layer are heat-fusible merge together.
  • a connecting part by which the outer layer is connected to an inner layer by a connecting means and a region where the outer layer is not connected to the inner layer so that a communicating passage having an exit opening to the outer space is formed.
  • On the inside means are provided which connect the interior with the communicating passage.
  • the exit opening is with a Adhesive layer provided that breaks when a certain pressure in the interior of the package breaks. This ensures a certain overpressure in the package when heated in the microwave, and also ensures controlled release of the overpressure above a certain value.
  • a package of an unopened heatable, in particular microwave heatable material which has at least one sealing region which becomes locally permeable when a certain internal pressure is exceeded, said sealing region has at least one Soll dielassabêt forming a throttle for the package contents, and in the form of a channel-like Passage is formed, and comprises a packaging interior facing the tip, which is preferably sealed.
  • valve construction Disadvantage of this valve construction is that the valve opens easily not only in the case of overpressure induced by heating, but also under mechanical pressure. Furthermore, the passage is not exactly dimensioned. In addition, there is the possibility that migrated during production, autoclaving, sterilization, storage or heating filling material from the package into the valve, the contents presses the valve then prematurely and can escape into the surrounding space of the microwave oven. But there is also the possibility that the valve is clogged by the infiltrated contents and the steam can not escape to the extent necessary. The valve must also be placed in the area of a sealed seam and can not be freely applied in another area of the film.
  • a package which has an absorber for the moisture escaping on heating, which makes a crisper preparation possible. Without a valve, through which excess steam can escape, the absorber is used up too quickly.
  • All these packages can not be closed again after opening and can therefore not be stored after opening and removing part of the contents, for example in the refrigerator WO 2005/007531 and WO 01/92000 show more packaging.
  • the object of the invention was to provide a suitable for heating in the microwave, in the oven or in a water bath packaging in the one hand, the construction of a defined pressure and a controlled escape of steam is possible and makes a steam cooking possible.
  • the invention therefore relates to a packaging suitable for heating in a microwave oven, in an oven or in a water bath, consisting of a multilayer film material which has at least one region which becomes permeable when an internal pressure generated by the heating is exceeded, characterized in that this region is formed is permeable by a micro perforation, which is covered by a lacquer coating, and when heated, the paint coating overlying the microperforated area and the microperforation is closed by the cooling paint when the packaging is cooled.
  • the microperforation can be introduced by needling or by means of a laser beam in the film material.
  • the shape of the microperforated area may vary and may have, for example, the shape of a circle, rectangle, square, trapezium, triangle, an elliptical or semi-elliptical shape, but also the shape of defined characters, symbols, lines, letters, inscriptions and the like.
  • the shape of the micro-perforation may be in the form of a circle, a slit, a rectangle, a square and the like.
  • the arrangement of the circles, slits, rectangles or squares and the like of the micro-perforation may optionally give a logo and the like.
  • the dimensions of the microperforation in its longitudinal and / or widthwise extent may be 10 ⁇ m to 1.5 mm, preferably 50 ⁇ m to 1 mm. If appropriate, at least in the microperforated area, a further film can be laminated by means of a varnish or adhesive varnish softenable by the action of heat which has microperforations offset from the first microperforations. This achieves a temporally and spatially offset opening of the microperforated valve.
  • the microperforated valve can be applied anywhere on the package.
  • the microperforated area is covered with a varnish coating.
  • the paint coating may be aqueous or solid paint systems, in particular also a paint system based on polyester acrylate or epoxy acrylate rosin, acrylate, alkyd, melamine, PVA, PVC, isocyanate, urethane, butadiene, styrene or their copolymers which may be conventional or reactive curing (chemical or radiation curing).
  • the lacquer or the microperforation covering label, hot stamping foil or covering lacquer coating may also contain energy absorbing additives such as metallic additives, graphite, energy absorbing pigments or particles and the like.
  • energy absorbing additives such as metallic additives, graphite, energy absorbing pigments or particles and the like.
  • particles and pigments come into question whose molecular components come into resonance by the incident microwave radiation and are put into thermal oscillation or in which currents are induced by the incident microwave radiation.
  • These are understood in particular to mean pigments or particles which contain molecular water, such as water glass or zeolites.
  • known conductive polymers can also be used.
  • the paint coating can be prepared by known coating or printing processes, by gravure, flexographic printing, screen printing, offset printing, Digital printing, smooth roll, raster or line screening method, each with co-rotation or reverse run, curtain coating and the like are applied to the microperforated area.
  • the paint layer lying above the microperforated area becomes brittle and therefore permeable, and the resulting steam can escape.
  • the packaging cools, the microperforation is closed again by the cooling paint.
  • the packaging can be sealed again and, for example, stored until further use, optionally with cooling.
  • the film material of the packaging is two or more layers.
  • the outer layer preferably consists of a film of plastic, for example polyester, such as oriented PET amorphous PET, polyolefins such as polypropylene, cast-PP, blown, stretched, biaxially oriented PP films, or polyethylene, polystyrene, polycarbonate, cellophane, polyamide, polyvinyl chloride or their copolymers.
  • polyester such as oriented PET amorphous PET, polyolefins such as polypropylene, cast-PP, blown, stretched, biaxially oriented PP films, or polyethylene, polystyrene, polycarbonate, cellophane, polyamide, polyvinyl chloride or their copolymers.
  • coextruded or laminated plastic composite films or composites with paper can be used.
  • the thickness of the outer layer is preferably 8-200 ⁇ m.
  • the inner layer preferably consists of a sealable medium, for example of plastic films of polyolefins, such as polyethylene, polypropylene, EVOH, EVA, and / or its copolymers or terpolymers, polystyrene, polycarbonate, cellophane, polyamide, polyvinyl chloride.
  • the inner layer can also be formed by extrusion coating or painting the outer film with one of the plastics mentioned.
  • the thickness of the inner layer is preferably 0.5-100 ⁇ m.
  • Intermediate layers may optionally be located between the outer and inner layers.
  • interlayers may include, for example, barrier layers such as alumina layers or silicon oxide layers, organic barrier layers such as polyamide layers, absorber layers, for example gas absorber layers such as O 2 , CO 2 absorber layers, water vapor absorber layers, ethylene absorber layers, printed layers, layers providing increased flexibility or strength or stiffness, and the like be.
  • barrier layers such as alumina layers or silicon oxide layers
  • organic barrier layers such as polyamide layers
  • absorber layers for example gas absorber layers such as O 2 , CO 2 absorber layers, water vapor absorber layers, ethylene absorber layers, printed layers, layers providing increased flexibility or strength or stiffness, and the like be.
  • the entire layer composite of the packaging according to the invention may optionally comprise a plurality of intermediate layers and combinations of these intermediate layers, wherein the layers either each have good adhesion to each other or may be interconnected by adhesive aids such as adhesives.
  • a feature can be applied around this area on the film material and the covering material in each case, such that when it becomes permeable, it shows a clear change in the appearance.
  • two different colored features can be applied, which form a mixed color in the covered state. After opening the valve, the two layers are separated, the pure colors appear.
  • one or more absorber layers can be provided for the water vapor formed during the heating.
  • absorber layers for example, hydrophilic polymers, such as EVA, highly filled with zeolites polymers, silica gel, nonwovens, or tissue have embedded the hydrophilic polymers, zeolite-coated nonwovens or tissue in question.
  • the absorber layer may be applied to the inner layer by printing processes.
  • the absorber layer can also be fixed to the inner layer with a thin sealing layer or membrane.
  • the fixation layer or the membrane may have a predetermined breaking point. When a defined pressure in the package is exceeded, the membrane is stretched and ruptures at the predetermined breaking point, whereby the absorber layer is exposed and the resulting water vapor can be absorbed.
  • such an additional membrane may also contain flavoring substances, for example smoking substances, or the like, which are then released when the defined pressure is exceeded by opening the membrane.
  • flavoring substances for example smoking substances, or the like
  • encapsulated aroma substances can also be introduced in the valve region, which are released when the valve is opened.
  • the packaging may have a preferably recloseable opening aid, for example a laser perforation, a tear thread, wherein this opening can then be resealed by applying a label.
  • a recloseable opening aid for example a laser perforation, a tear thread, wherein this opening can then be resealed by applying a label.
  • the packaging may be in the form of a bag, a bag, a stand-up pouch, a tray, sachet, pouch or in the form of a sealing film for containers.

Abstract

The invention relates to a packaging suited for heating in microwave ovens, ovens or double boilers, which is comprised of a multilayer film material having at least one area that is rendered permeable when an internal pressure generated by the microwave heating is exceeded. The invention is characterized in that this area is formed by a microperforation that is covered by a label or by a hot stamping film or by a varnish coating.

Description

Die Erfindung betrifft eine Verpackung für Lebensmittel, Fertiggerichte, Tierfutter, Non-Food-Produkte, wie Cold-Hot-Packs, verpackte Erfrischungstücher, Waschmittel, Reinigungsmittel und dergleichen, die zur Verwendung in der Mikrowelle, im Ofen oder im Wasserbad geeignet ist.The invention relates to a package for food, ready meals, animal feed, non-food products, such as cold-hot packs, packaged refreshment wipes, detergents, cleaning agents and the like, which is suitable for use in the microwave, in the oven or in a water bath.

Lebensmittel oder Fertiggerichte, die in einer Verpackung erwärmt werden, insbesondere in einem Mikrowellenofen oder einem Ofen oder einem Wasserbad, sind bekannt.
Unter Verpackungen werden starre, halbstarre oder flexible Verpackungen verstanden.
Derartige Verpackungen neigen aufgrund der mit der Erwärmung einhergehenden Ausdehnung des Inhalts und der Ausdehnung von Luft und Gasen zum Aufplatzen oder Bersten.
In beschränktem Maße kann diese Gefahr durch Verwendung von Verpackungen, die deutlich größer dimensioniert sind als das Volumen des Füllguts, vermindert werden.
Femer wird das im Füllgut vorhandene Wasser bei der Erwärmung in Dampf umgewandelt. Dieser Dampf kann durch die üblichen versiegelten Verpackungen nicht oder nur schwer entweichen, es ist daher kein knuspriges Erwärmen von Fertiggerichten möglich.Foods or ready meals that are heated in a package, especially in a microwave oven or oven or water bath, are known.
Packaging is understood to be rigid, semi-rigid or flexible packaging.
Such packages tend to burst or rupture due to the expansion of content and expansion of air and gases associated with heating.
To a limited extent, this risk can be reduced by using packaging that is significantly larger than the volume of the product.
Furthermore, the water present in the product is converted into steam when heated. This steam can not or hardly escape through the usual sealed packaging, so it is not possible crispy heating of ready meals.

Aus der EP 661 219 B1 ist eine Verpackung bekannt, die einen mehrlagigen Aufbau aufweist. Dabei sind die Außenlage und die Innenlage wärmefrei miteinander verschmelzbar. Ferner ist ein Verbindungsteil vorgesehen, durch den die Außenschicht mit einer Innenschicht durch ein Verbindungsmittel miteinander verbunden ist und ein Bereich, in dem die Außenschicht nicht mit der Innenschicht verbunden ist, sodass ein kommunizierender Durchgang gebildet wird, der eine Ausgangsöffnung zum Außenraum aufweist.
An der Innenseite sind Mittel vorgesehen, die den Innenraum mit dem kommunizierenden Durchgang verbinden. Die Ausgangsöffnung ist mit einer Klebeschicht versehen, die bei Überschreiten eines bestimmten Drucks im Innenraum der Verpackung aufbricht.
Dadurch wird ein bestimmter Überdruck in der Verpackung bei der Erwärmung in der Mikrowelle gewährleistet, ferner wird ein kontrolliertes Entweichen des Überdrucks ab einem bestimmten Wert gewährleistet.From the EP 661 219 B1 a package is known which has a multilayer structure. The outer layer and the inner layer are heat-fusible merge together. Further, there is provided a connecting part by which the outer layer is connected to an inner layer by a connecting means and a region where the outer layer is not connected to the inner layer so that a communicating passage having an exit opening to the outer space is formed.
On the inside means are provided which connect the interior with the communicating passage. The exit opening is with a Adhesive layer provided that breaks when a certain pressure in the interior of the package breaks.
This ensures a certain overpressure in the package when heated in the microwave, and also ensures controlled release of the overpressure above a certain value.

Aus der WO 03/051745 A ist eine Verpackung eines ungeöffnet erwärmbaren, insbesondere mikrowellenerhitzbaren Gutes bekannt, die mindestens einen Versiegelungsbereich aufweist, der bei Überschreitung eines bestimmten Innendrucks lokal durchlässig wird, wobei dieser Versiegelungsbereich mindestens einen Solldurchlassabschnitt aufweist, der eine Drossel für den Verpackungsinhalt bildet, und der in Form eines kanalartigen Durchlasses ausgebildet ist, und eine dem Verpackungsinnenraum zugewandte Spitze umfasst, die vorzugsweise umsiegelt ist.From the WO 03/051745 A a package of an unopened heatable, in particular microwave heatable material is known, which has at least one sealing region which becomes locally permeable when a certain internal pressure is exceeded, said sealing region has at least one Solldurchlassabschnitt forming a throttle for the package contents, and in the form of a channel-like Passage is formed, and comprises a packaging interior facing the tip, which is preferably sealed.

Nachteil dieser Ventilkonstruktion ist, dass das Ventil nicht nur bei durch Erwärmung induziertem Überdruck von innen, sondern auch bei mechanischem Druck leicht öffnet. Femer ist der Durchgangskanal nicht exakt dimensionierbar. Außerdem besteht die Möglichkeit, dass während der Herstellung, Autoklavierung, Sterilisation, Lagerung oder Erwärmung Füllgut aus der Verpackung ins Ventil migriert, das Füllgut drückt das Ventil dann vorzeitig auf und kann in den umgebenden Raum des Mikrowellenofens austreten. Es besteht aber auch die Möglichkeit, dass das Ventil durch das eingedrungene Füllgut verstopft wird und der Dampf nicht im notwendigen Ausmaß entweichen kann. Das Ventil muss zudem im Bereich einer Siegelnaht angebracht werden und kann nicht frei in einem anderen Bereich der Folie aufgebracht werden.Disadvantage of this valve construction is that the valve opens easily not only in the case of overpressure induced by heating, but also under mechanical pressure. Furthermore, the passage is not exactly dimensioned. In addition, there is the possibility that migrated during production, autoclaving, sterilization, storage or heating filling material from the package into the valve, the contents presses the valve then prematurely and can escape into the surrounding space of the microwave oven. But there is also the possibility that the valve is clogged by the infiltrated contents and the steam can not escape to the extent necessary. The valve must also be placed in the area of a sealed seam and can not be freely applied in another area of the film.

Aus der WO 04/13015 A ist eine Verpackung bekannt, die einen Absorber für die beim Erwärmen entweichende Feuchtigkeit aufweist, wodurch eine knusprigere Zubereitung möglich ist. Ohne Ventil, durch das überschüssiger Dampf entweichen kann, wird der Absorber aber zu schnell aufgebraucht.From the WO 04/13015 A For example, a package is known which has an absorber for the moisture escaping on heating, which makes a crisper preparation possible. Without a valve, through which excess steam can escape, the absorber is used up too quickly.

Alle diese Verpackungen können nach dem Öffnen nicht mehr wieder verschlossen werden und können daher nach dem Öffnen und der Entnahme eines Teils des Inhalts nicht gelagert werden, beispielsweise im Kühlschrank WO 2005/007531 und WO 01/92000 zeigen weitere Verpackungen.All these packages can not be closed again after opening and can therefore not be stored after opening and removing part of the contents, for example in the refrigerator WO 2005/007531 and WO 01/92000 show more packaging.

Aufgabe der Erfindung war es, eine für die Erwärmung in der Mikrowelle, im Ofen oder im Wasserbad geeignete Verpackung bereitzustellen, in der einerseits der Aufbau eines definierten Überdrucks und ein kontrolliertes Entweichen des Dampfes möglich ist und eine Dampfgarung möglich macht.The object of the invention was to provide a suitable for heating in the microwave, in the oven or in a water bath packaging in the one hand, the construction of a defined pressure and a controlled escape of steam is possible and makes a steam cooking possible.

Gegenstand der Erfindung ist daher eine zur Erwärmung im Mikrowellenofen, im Ofen oder im Wasserbad geeignete Verpackung, bestehend aus einem mehrlagigen Folienmaterial, die mindestens einen Bereich aufweist, der bei Überschreiten eines durch die Erhitzung erzeugten Innendrucks durchlässig wird, dadurch gekennzeichnet, dass dieser Bereich gebildet wird durch eine Mikroperforation, die durch eine Lackbeschichtung abgedeckt ist, und bei Erwärmung die über dem mikroperforierten Bereich liegende Lackbeschichtung durchlässig wird und bei Abkühlung der Verpackung die Mikroperforation durch den sich abkühlenden Lack wieder verschlossen wird.The invention therefore relates to a packaging suitable for heating in a microwave oven, in an oven or in a water bath, consisting of a multilayer film material which has at least one region which becomes permeable when an internal pressure generated by the heating is exceeded, characterized in that this region is formed is permeable by a micro perforation, which is covered by a lacquer coating, and when heated, the paint coating overlying the microperforated area and the microperforation is closed by the cooling paint when the packaging is cooled.

Die Mikroperforation kann durch Nadeln oder mittels eines Laserstrahls in das Folienmaterial eingebracht werden.
Die Form des mikroperforierten Bereichs kann variieren und beispielsweise die Form eines Kreises, Rechtecks, Quadrats, Trapezes, Dreiecks, eine elliptische oder halbelliptische Form, aber auch die Form von definierten Zeichen, Symbolen, Linien, Buchstaben, Schriftzügen und dergleichen aufweisen.
Die Form der Mikroperforation kann die Form eines Kreises, eines Schlitzes, eines Rechtecks, eines Quadrats und dergleichen bilden.
Die Anordnung der Kreise, Schlitze, Rechtecke oder Quadrate und dergleichen der Mikroperforation kann gegebenenfalls ein Logo und dergleichen ergeben.The microperforation can be introduced by needling or by means of a laser beam in the film material.
The shape of the microperforated area may vary and may have, for example, the shape of a circle, rectangle, square, trapezium, triangle, an elliptical or semi-elliptical shape, but also the shape of defined characters, symbols, lines, letters, inscriptions and the like.
The shape of the micro-perforation may be in the form of a circle, a slit, a rectangle, a square and the like.
The arrangement of the circles, slits, rectangles or squares and the like of the micro-perforation may optionally give a logo and the like.

Dabei können die Dimensionen der Mikroperforation in deren Längs- und/oder Breitenerstreckung 10 µm bis 1,5 mm, vorzugsweise 50 µm bis 1 mm betragen. Gegebenenfalls kann zumindest im mikroperforierten Bereich eine weitere Folie über einen bei Wärmeeinwirkung erweichbaren Lack oder Klebelack kaschiert sein, die zu den ersten Mikroperforationen versetzte Mikroperforationen aufweist.
Dadurch wird eine zeitlich und örtlich versetzte Öffnung des mikroperforierten Ventils erreicht.The dimensions of the microperforation in its longitudinal and / or widthwise extent may be 10 μm to 1.5 mm, preferably 50 μm to 1 mm. If appropriate, at least in the microperforated area, a further film can be laminated by means of a varnish or adhesive varnish softenable by the action of heat which has microperforations offset from the first microperforations.
This achieves a temporally and spatially offset opening of the microperforated valve.

Das mikroperforierte Ventil kann an jeder beliebigen Stelle der Verpackung aufgebracht werden.The microperforated valve can be applied anywhere on the package.

Der mikroperforierte Bereich wird mit einer Lackbeschichtung abgedeckt.The microperforated area is covered with a varnish coating.

Die Lackbeschichtung kann ein wässriges als auch festes Lacksysteme, insbesondere auch ein Lacksystem auf Basis Polyester-Acrylat oder Epoxyacrylat Kolophonium-, Acrylat-, Alkyd-, Melamin-, PVA-, PVC-, Isocyanat-, Urethansysteme, Butadien, Styrolsystem oder deren Copolymere sein, die konventionell oder reaktiv härtend (chemisch oder strahlungshärtend) sein können.The paint coating may be aqueous or solid paint systems, in particular also a paint system based on polyester acrylate or epoxy acrylate rosin, acrylate, alkyd, melamine, PVA, PVC, isocyanate, urethane, butadiene, styrene or their copolymers which may be conventional or reactive curing (chemical or radiation curing).

Gegebenenfalls kann der Lack oder das die Mikroperforation abdeckende Etikett, die Heißprägefolie oder die abdeckende Lackbeschichtung auch energieabsorbierende Zusatzstoffe, wie metallische Zusatzstoffe, Graphit, energieabsorbierende Pigmente oder Partikel und dergleichen enthalten. Insbesondere kommen Partikel und Pigmente in Frage, deren molekulare Bestandteile durch die einfallende Mikrowelleneinstrahlung in Resonanz kommen und in thermische Schwingung versetzt werden oder bei denen durch die einfallende Mikrowellenstrahlung Ströme induziert werden.
Darunter werden insbesondere Pigmente oder Partikel verstanden, die molekulares Wasser beinhalten, wie Wasserglas oder Zeolithe. Femer können auch bekannte leitfähige Polymere verwendet werden.Optionally, the lacquer or the microperforation covering label, hot stamping foil or covering lacquer coating may also contain energy absorbing additives such as metallic additives, graphite, energy absorbing pigments or particles and the like. In particular, particles and pigments come into question whose molecular components come into resonance by the incident microwave radiation and are put into thermal oscillation or in which currents are induced by the incident microwave radiation.
These are understood in particular to mean pigments or particles which contain molecular water, such as water glass or zeolites. Furthermore, known conductive polymers can also be used.

Die Lackbeschichtung kann durch bekannte Beschichtungs- oder Druckverfahren, durch Tiefdruck, Flexodruck, Siebdruck, Offsetdruck, Digitaldruck, Glattwalzen-, Raster- oder Linienrasterverfahren, jeweils mit Mit- oder Gegenlauf, Curtain Coating und dergleichen auf den mikroperforierten Bereich aufgebracht werden.The paint coating can be prepared by known coating or printing processes, by gravure, flexographic printing, screen printing, offset printing, Digital printing, smooth roll, raster or line screening method, each with co-rotation or reverse run, curtain coating and the like are applied to the microperforated area.

Bei Erwärmung in der Mikrowelle wird die über dem mikroperforierten Bereich liegende Lackschicht spröde und damit durchlässig, der entstehende Dampf kann entweichen.
Bei Abkühlung der Verpackung wird die Mikroperforation durch den sich abkühlenden Lack wieder verschlossen.When heated in the microwave, the paint layer lying above the microperforated area becomes brittle and therefore permeable, and the resulting steam can escape.
When the packaging cools, the microperforation is closed again by the cooling paint.

Dadurch kann die Verpackung wieder abgedichtet werden und beispielsweise bis zur weiteren Verwendung, gegebenenfalls unter Kühlung, gelagert werden.As a result, the packaging can be sealed again and, for example, stored until further use, optionally with cooling.

Das Folienmaterial der Verpackung ist zwei- oder mehrlagig.
Die äußere Schicht besteht vorzugsweise aus einer Folie aus Kunststoff, beispielsweise Polyester, wie orientiertes PET amorphes PET, Polyolefine wie Polypropylen, Cast-PP, geblasenen, gereckte, biaxial gereckte PP-Folien, oder Polyethylen, Polystyrol, Polycarbonat, Zellglas, Polyamid, Polyvinylchlorid oder deren Copolymere. Es können aber coextrudierte oder laminierte Kunststoffverbundfolien oder Verbunde mit Papier verwendet werden. Femer ist es möglich beschichtete Folien, biologisch abbaubare Folien, Aluminiumfolien und dergleichen zu verwenden. Die Dicke der äußeren Schicht beträgt vorzugsweise 8 - 200 µm.The film material of the packaging is two or more layers.
The outer layer preferably consists of a film of plastic, for example polyester, such as oriented PET amorphous PET, polyolefins such as polypropylene, cast-PP, blown, stretched, biaxially oriented PP films, or polyethylene, polystyrene, polycarbonate, cellophane, polyamide, polyvinyl chloride or their copolymers. However, coextruded or laminated plastic composite films or composites with paper can be used. Furthermore, it is possible to use coated films, biodegradable films, aluminum foils and the like. The thickness of the outer layer is preferably 8-200 μm.

Die innere Schicht besteht vorzugsweise aus einem siegelfähigen Medium, beispielsweise aus Kunststofffolien aus Polyolefinen, wie Polyethylen, Polypropylen, aus EVOH, EVA, und/oder dessen Copolymeren oder Terpolymeren, Polystyrol, Polycarbonat, Zellglas, Polyamid, Polyvinylchlorid. Die innere Schicht kann aber auch durch eine Extrusionsbeschichtung oder Lackierung der äußeren Folie mit einem der genannten Kunststoffe gebildet werden.
Die Dicke der inneren Schicht beträgt vorzugsweise 0,5 -100 µm.The inner layer preferably consists of a sealable medium, for example of plastic films of polyolefins, such as polyethylene, polypropylene, EVOH, EVA, and / or its copolymers or terpolymers, polystyrene, polycarbonate, cellophane, polyamide, polyvinyl chloride. The inner layer can also be formed by extrusion coating or painting the outer film with one of the plastics mentioned.
The thickness of the inner layer is preferably 0.5-100 μm.

Zwischen der äußeren und der inneren Schicht können gegebenenfalls Zwischenschichten situiert sein. Derartige Zwischenschichten können beispielsweise Barriereschichten, wie Aluminiumoxidschichten oder Siliciumoxidschichten, organische Barriereschichten, wie Polyamidschichten, Absorberschichten, beispielsweise Gasabsorberschichten wie O2-, CO2-Absorberschichten, Wasserdampfabsorberschichten, Ethylenabsorberschichten, bedruckte Schichten, Schichten, die erhöhte Flexibilität oder Festigkeit oder Steifigkeit verleihen und dergleichen sein.
Der gesamte Schichtverbund der erfindungsgemäßen Verpackung kann gegebenenfalls mehrere Zwischenschichten und Kombinationen dieser Zwischenschichten umfassen, wobei die Schichten entweder jeweils gute Haftung zueinander aufweisen oder durch Hafthilfsmittel, wie Klebemittel untereinander verbunden sein können.Intermediate layers may optionally be located between the outer and inner layers. Such interlayers may include, for example, barrier layers such as alumina layers or silicon oxide layers, organic barrier layers such as polyamide layers, absorber layers, for example gas absorber layers such as O 2 , CO 2 absorber layers, water vapor absorber layers, ethylene absorber layers, printed layers, layers providing increased flexibility or strength or stiffness, and the like be.
The entire layer composite of the packaging according to the invention may optionally comprise a plurality of intermediate layers and combinations of these intermediate layers, wherein the layers either each have good adhesion to each other or may be interconnected by adhesive aids such as adhesives.

Zum Nachweis der Öffnung des mirkoperforierten Ventils kann um diesen Bereich auf dem Folienmaterial und dem Abdeckmaterial jeweils ein Merkmal aufgebracht sein, dass bei Durchlässigwerden eine deutliche Änderung des Erscheinungsbildes zeigt.
Dabei können beispielsweise zwei unterschiedliche farbige Merkmale aufgebracht werden, die in abgedeckten Zustand eine Mischfarbe bilden. Nach Öffnen des Ventils werden die beiden Schichten getrennt, es erscheinen die reinen Farben.In order to detect the opening of the micro-perforated valve, a feature can be applied around this area on the film material and the covering material in each case, such that when it becomes permeable, it shows a clear change in the appearance.
In this case, for example, two different colored features can be applied, which form a mixed color in the covered state. After opening the valve, the two layers are separated, the pure colors appear.

Femer kann vorgesehen sein, zum Nachweis des Öffnens des Ventils auf den sich trennenden Schichten partielle Informationen aufzubringen, die sich dann nach dem Öffnen zu einer verständlichen Informationen, beispielsweise einem Schriftzug, beispielsweise "open" oder "offen" und dergleichen ergänzen. Dies kann unter Verwendung von Hilfsschichten mit unterschiedlicher Haftfestigkeit erfolgen.Furthermore, provision can be made for proving the opening of the valve to apply partial information to the separating layers, which then, after opening, supplement themselves with understandable information, for example lettering, for example "open" or "open" and the like. This can be done using auxiliary layers with different adhesive strength.

Femer können auf der dem Innenraum der Verpackung zugewandten Seite der inneren Schicht eine oder mehrere Absorberschichten für den bei der Erwärmung entstehenden Wasserdampf vorgesehen sein. Als derartige Absorberschichten kommen beispielsweise hydrophile Polymere, wie EVA, mit Zeolithen hochgefüllte Polymere, Silicagel, Vliese, oder Gewebe die hydrophile Polymere eingelagert haben, mit Zeolith beschichtete Vliese oder Gewebe in Frage.Furthermore, on the side of the inner layer facing the interior of the packaging, one or more absorber layers can be provided for the water vapor formed during the heating. As such absorber layers, for example, hydrophilic polymers, such as EVA, highly filled with zeolites polymers, silica gel, nonwovens, or tissue have embedded the hydrophilic polymers, zeolite-coated nonwovens or tissue in question.

In einer Ausführungsform kann die Absorberschicht durch Druckverfahren auf die innere Schicht aufgebracht sein.In one embodiment, the absorber layer may be applied to the inner layer by printing processes.

Die Absorberschicht kann aber auch mit einer dünnen Siegelschicht bzw. Membran an der inneren Schicht fixiert sein. Die Fixierungsschicht bzw. die Membran kann eine Sollbruchstelle aufweisen. Bei Überschreiten eines definierten Drucks in der Verpackung wird die Membran gedehnt und reißt an der Sollbruchstelle auf, wodurch die Absorberschicht freigelegt wird und der entstehende Wasserdampf absorbiert werden kann.However, the absorber layer can also be fixed to the inner layer with a thin sealing layer or membrane. The fixation layer or the membrane may have a predetermined breaking point. When a defined pressure in the package is exceeded, the membrane is stretched and ruptures at the predetermined breaking point, whereby the absorber layer is exposed and the resulting water vapor can be absorbed.

Anstelle der Absorberschicht können unter einer derartigen evt. zusätzlichen Membran auch Aromastoffe, beispielsweise Räucherstoffe, oder dergleichen vorhanden sein, die dann bei Überschreiten eines definierten Drucks durch Öffnen der Membran freigesetzt werden.
Zur Erzeugung eines charakteristischen Aromas können auch im Ventilbereich gekapselte Aromastoffe eingebracht sein, die bei Öffnen des Ventils freigesetzt werden.Instead of the absorber layer, such an additional membrane may also contain flavoring substances, for example smoking substances, or the like, which are then released when the defined pressure is exceeded by opening the membrane.
In order to produce a characteristic aroma, encapsulated aroma substances can also be introduced in the valve region, which are released when the valve is opened.

Ferner kann die Verpackung eine vorzugsweise wiederverschließbare Öffnungshilfe, beispielsweise eine Laserperforation, einen Aufreißfaden aufweisen, wobei diese Öffnung dann durch Aufbringen eines Etiketts wiederverschlossen werden kann.
Bei Einbringen einer Laserperforation kann durch Modulation der Laserenergie in einem Arbeitsgang sowohl die Mikroperforation des Ventils als auch die Öffnungshilfe eingebracht werden.Furthermore, the packaging may have a preferably recloseable opening aid, for example a laser perforation, a tear thread, wherein this opening can then be resealed by applying a label.
When introducing a laser perforation, both the microperforation of the valve and the opening aid can be introduced by modulation of the laser energy in a single operation.

Als Öffnungshilfe kommen aber auch reißverschluss- oder gleitverschluss-artige Einrichtungen in Frage, die selbst wiederverschließbar sind.As an opening aid but also zipper or sliding closure-like devices come into question, which are self-resealable.

Die Verpackung kann in Form eines Beutels, einer Tasche, eines Standbeutels, eines Tabletts, Sachet, Pouch oder in Form einer Siegelfolie für Behälter ausgebildet sein.The packaging may be in the form of a bag, a bag, a stand-up pouch, a tray, sachet, pouch or in the form of a sealing film for containers.

Claims (11)

  1. A packaging, which is suitable for being heated in a microwave oven, in an oven or in a double boiler, consisting of a multi-layer film material, wherein the packaging comprises at least one area, which becomes permeable in the event that an internal pressure generated by means of the microwave heating has been exceeded, wherein this area is formed by means of a micro-perforation, characterized in that the micro-perforation is covered by means of a lacquer coating, and in that the lacquer coating located above the micro-perforated area becomes permeable in response to a heating and in that the micro-perforation is reclosed by means of the cooling lacquer in response to the cooling of the packaging.
  2. The packaging according to claim 1, characterized in that the micro-perforated area comprises the shape of a circle, a rectangle, a square, a trapezoid, a triangle, an elliptical or semi-elliptical shape, but also the shape of defined characters, symbols, letters, scripts and the like, for example.
  3. The packaging according to one of claims 1 or 2, characterized in that the micro-perforation is designed in the shape of a circle, of a slit, of a rectangle, of a square and the like.
  4. The packaging according to one of claims 1 to 3, characterized in that the micro-perforation results in the shape of a logo.
  5. The packaging according to one of claims 1 or 2, characterized in that the micro-perforated area is embodied by means of a lacquer coating on the basis of a mixture or by means of a polyester acrylate or epoxy acrylate colophony system, acrylate system, alkyd system, melamine system, PVA system, PVC system, isocyanate system, urethane system, butadiene, styrol system or the copolymers thereof.
  6. The packaging according to claim 3, characterized in that the lacquer coating includes an energy-absorbing additive.
  7. The packaging according to one of claims 1 to 4, characterized in that provision is made for intermediate layers between outer and inner layer.
  8. The packaging according to claim 5, characterized in that the intermediate layers, barrier layers, absorber layers, browning layers are flexibility or stability or rigidity and/or imprinted layers.
  9. The packaging according to one of claims 1 to 6, characterized in that an absorber layer, which is fixed by means of a membrane comprising a predetermined breaking point, is fixed on the side of the inner layer, which faces the interior of the packaging.
  10. The packaging according to one of claims 1 to 7, characterized in that, in the area of the micro-perforation, different features are applied, which display a considerable change of the optical appearance after the valve has been opened.
  11. A film material for producing packaging according to one of claims 1 to 8, which comprises at least one area, which becomes permeable in the event that an internal pressure generated by means of the microwave heating has been exceeded, wherein this area is formed by means of a micro-perforation, characterized in that the micro-perforation is covered by means of a lacquer coating, and in that the lacquer coating located above the micro-perforated area becomes permeable in response to a heating and in that the micro-perforation is reclosed by means of the cooling lacquer in response to the cooling.
EP06805636A 2005-07-27 2006-07-26 Reclosable microwave-suitable packaging Not-in-force EP1912865B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PL06805636T PL1912865T3 (en) 2005-07-27 2006-07-26 Reclosable microwave-suitable packaging
SI200630643T SI1912865T1 (en) 2005-07-27 2006-07-26 Reclosable microwave-suitable packaging
CY20101100564T CY1110110T1 (en) 2005-07-27 2010-06-17 PACKAGING MAY BE REFLECTED FOR MICROWAVE

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0125705A AT502215A1 (en) 2005-07-27 2005-07-27 RE-LOCKABLE MICROWAVE-SUITABLE PACKAGING
PCT/EP2006/007345 WO2007012468A2 (en) 2005-07-27 2006-07-26 Reclosable microwave-suitable packaging

Publications (2)

Publication Number Publication Date
EP1912865A2 EP1912865A2 (en) 2008-04-23
EP1912865B1 true EP1912865B1 (en) 2010-04-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP06805636A Not-in-force EP1912865B1 (en) 2005-07-27 2006-07-26 Reclosable microwave-suitable packaging

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US (1) US20100276327A1 (en)
EP (1) EP1912865B1 (en)
AT (2) AT502215A1 (en)
CA (1) CA2617078A1 (en)
CY (1) CY1110110T1 (en)
DE (1) DE502006006808D1 (en)
DK (1) DK1912865T3 (en)
ES (1) ES2342845T3 (en)
PL (1) PL1912865T3 (en)
PT (1) PT1912865E (en)
SI (1) SI1912865T1 (en)
WO (1) WO2007012468A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2005250421A1 (en) * 2004-05-27 2005-12-15 Perftech Inc. Packaging material and method for microwave and steam cooking of perishable food product
ITVA20100086A1 (en) * 2010-11-30 2012-05-31 Masterpack S P A THERMO-WELDED BAG FOR PACKAGING FOOD PRODUCTS SUBJECT TO RELEASE OF GAS OR VAPORS AFTER SEALING AND CONTINUOUS TAPE FOR THE FORMATION OF BAGS
DE102019126625B4 (en) * 2019-10-02 2022-02-17 Lang Laser-System Gmbh Packaging for outgassing and/or after-ripening foodstuffs, in particular for roasted coffee and/or coffee beans

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3198260B2 (en) * 1996-11-13 2001-08-13 尾本 等 Packaging material and food and beverage package having pressure regulating valve function
EP1289744B1 (en) * 2000-06-01 2009-10-14 Irene Lin Method for manufacturing an air permeable composite film
ES2256497T3 (en) * 2001-07-23 2006-07-16 International Trex Limited FILM FOR PACKING.
GB2367527B (en) * 2001-07-23 2002-09-11 Abdul Aziz Okhai Packaging film
GB0316708D0 (en) * 2003-07-16 2003-08-20 Dupont Teijin Films Us Ltd Polymeric film
US7543708B2 (en) * 2004-08-23 2009-06-09 United States Gypsum Company Plastic bag for fine powders
DE102004047256A1 (en) * 2004-09-29 2006-04-13 Lang Laser-System Gmbh Film packaging for food with pressure relief valve

Also Published As

Publication number Publication date
CY1110110T1 (en) 2015-01-14
WO2007012468A3 (en) 2007-03-29
PT1912865E (en) 2010-07-01
EP1912865A2 (en) 2008-04-23
ATE465098T1 (en) 2010-05-15
DK1912865T3 (en) 2010-07-26
US20100276327A1 (en) 2010-11-04
SI1912865T1 (en) 2010-09-30
ES2342845T3 (en) 2010-07-15
PL1912865T3 (en) 2010-09-30
DE502006006808D1 (en) 2010-06-02
AT502215A1 (en) 2007-02-15
WO2007012468A2 (en) 2007-02-01
CA2617078A1 (en) 2007-02-01

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