EP2347972B1 - Resealable packaging - Google Patents

Resealable packaging Download PDF

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Publication number
EP2347972B1
EP2347972B1 EP11151841.1A EP11151841A EP2347972B1 EP 2347972 B1 EP2347972 B1 EP 2347972B1 EP 11151841 A EP11151841 A EP 11151841A EP 2347972 B1 EP2347972 B1 EP 2347972B1
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EP
European Patent Office
Prior art keywords
film
layer
sealing film
packaging according
sealing
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EP11151841.1A
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German (de)
French (fr)
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EP2347972A1 (en
Inventor
Josef Ferber
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Amcor Flexibles Kreuzlingen AG
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Amcor Flexibles Kreuzlingen AG
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Publication of EP2347972A1 publication Critical patent/EP2347972A1/en
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    • 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
    • B65D2577/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks, bags
    • B65D2577/10—Container closures formed after filling
    • B65D2577/20—Container closures formed after filling by applying separate lids or covers
    • B65D2577/2041—Pull tabs
    • B65D2577/205—Pull tabs integral with the closure

Definitions

  • the invention relates to a resealable packaging according to one of claims 1 to 13 and a prefabricated multi-layer film according to claim 14.
  • Such resealable film packaging are known per se and are used, for example, for the packaging of wet wipes.
  • the advantage of this packaging is that the contents are protected from drying out thanks to the resealability.
  • Such a film packaging is for example from WO 2005/123535 A1 known. This has predetermined breaking lines extending through the top film from above and through the sealing film from below in the form of perforations or notches at which the top film detaches from the sealing film while the area provided with pressure-sensitive adhesive remains. Also from the EP 1 103 488 A1 and the US 2005/0276525 A1 a pack with such a reclosable packaging in a very simple embodiment is known.
  • the general problem with the previously known packaging is that the packaging closed before the first opening is tight against moisture permeability, but that it does not have sufficient tightness against gases, such as in particular oxygen, nitrogen or CO 2 .
  • This type of packaging is therefore hardly suitable for permanently protecting perishable foods such as sausage or cheese. This is especially true because such foods are usually packaged in a gas atmosphere and it is particularly important for the shelf life that the protected gas does not escape as far as possible.
  • U.S. 4,735,335 discloses a tape with lids for flat edged thermoplastic containers comprising a first tape made of aluminum and a second thermoplastic tape.
  • the object of the present invention is first of all to propose a resealable packaging with a high gas density which can be produced with simple means, which offers the goods packaged therein great protection and which is easy and convenient for the user to handle.
  • a method for applying the film cover to a tray in the context of the production of a packaging according to the invention is to be proposed.
  • the invention is initially based on the essential idea that the upper film forms a reliably stabilizing layer that is attached to the film cover mechanical rigidity there. According to the invention, this requirement is realized in that the upper film is homogeneous throughout and has no predetermined breaking line up to the outer edge of the edge strip. This upper film, which is "undamaged" over the entire packaging, offers the highest possible stability. According to the invention, the top film is formed by a single stable layer of oriented polypropylene film with a thickness between 38 g / m2 and 42 g / m2, which can also be printed and / or lacquered with a label specific to the product.
  • the further fundamental idea that is essential to the invention lies in the special distribution of different adhesives within the adhesive layer.
  • This distribution is such that the adhesive layer has an inner central area in which the upper film is permanently bonded to the sealing film by means of a permanent adhesive.
  • an outer edge area is also provided, in which, at least in the sections where the upper film is to detach from the sealing film, the upper film and the sealing film are releasably and resealably glued to one another by means of a pressure-sensitive adhesive, in particular a PSA ("Pressure Sensitive Adhesive").
  • PSA Pressure Sensitive Adhesive
  • the predetermined breaking line in the foil stack of the sealing foil is now provided between the edge area and the central area, so that the permanent adhesive is located within the predetermined breaking line and the pressure sensitive adhesive is located outside the predetermined breaking line.
  • the predetermined breaking line would thus correspond to the boundary between the pressure-sensitive adhesive and the permanent adhesive. Care must be taken that the predetermined breaking line does not come into contact with the edge area provided with adhesive. On the other hand, it would be unproblematic if it ends at the outer edge of the central area and thus a little bit in the permanent adhesive. In this way, when the packaging is torn open, the upper film remains adhered to the sealing film in the central area.
  • the predetermined breaking line is formed by an embossing made in the sealing film, which softens the stack of layers Sealing foil cut through at least up to the barrier layer.
  • This can be introduced mechanically or, in a special embodiment, from below by means of a laser beam into the stack of upper film and sealing film.
  • the packaging according to the invention is optimized with regard to its gas density in the originally closed state. This enables the food stored in the packaging to have a long shelf life.
  • the layer stack forming the sealing film has a specially designed barrier layer which has a particular density with respect to the diffusion of oxygen, nitrogen or carbon dioxide.
  • a barrier layer For the construction of such a barrier layer, it is advisable to vapor-deposit a metallization onto a plastic layer.
  • a plastic layer For example, an aluminum layer with a thickness between 5 nm and 10 nm can be vapor-deposited onto a layer of PET (polyethylene terephthalate) will. It can be advantageous if this metallization forms the top layer of the sealing film.
  • the predetermined breaking lines are then ideally brought up to the metallization "from below” so carefully that it is not penetrated, but is at most embossed and thus remains gas-tight.
  • the metallization can be covered by a further layer of polyamide.
  • the vapor-deposited metallization within the barrier layer can also be replaced by a likewise vapor-deposited oxide layer, in particular a layer of metal oxide, such as AlO x , or a layer of semiconductor oxide, in particular SiO x .
  • a correspondingly thicker plastic layer, in particular made of polyamide, can be provided as the barrier layer.
  • the "film sandwich", i.e. the stack, made up of the upper film and the sealing film can be finished in advance as a film composite and delivered to the packaging machine in a pre-assembled roll for further use.
  • the packaging machine which advantageously also forms and fills the trays during the packaging process, can then cover the filled trays with the prefabricated multilayer composite film in a step serving to close the trays and seal them on the edge strips of the trays.
  • Such a procedure is particularly effective and inexpensive.
  • Particularly biocompatible plastics, such as PLA (“polylactide”) can also be used within the framework of this film composite.
  • an appropriately prefabricated multilayer composite film is necessary for this, which is suitable for application to a preformed shell and thus for the production of packaging according to the invention insofar as it provides the necessary structuring within the adhesive layer with regard to the distribution of permanent adhesive and pressure sensitive adhesive, but also the formation of a tear corner at the front in includes.
  • Such a multilayer composite film accordingly comprises the top film and the sealing film provided with predetermined breaking lines.
  • Upper film and Sealing foils are now glued to one another by means of the various adhesives in such a way that a permanent adhesive is present in those areas that represent the central areas in the later finished packaging, which permanently connects the upper foil and the sealing foil Later packaging represent edge areas, releasably and resealably connected by means of a pressure-sensitive adhesive. Accordingly, tear tabs and connecting sections can be provided from the start.
  • a packaging method for a food in particular in slices offers the following steps: First, in a first step, the composite material used to produce the shells is arranged in several over their edge area connected shells.
  • the composite material advantageously has a sealing layer, in particular made of polyethylene. Shaping takes place in particular by means of a deep-drawing process.
  • the bowls shaped in this way are then equipped with the food.
  • the shells that are still connected and equipped are then covered with the prefabricated multilayer composite film and specifically sealed on the edge strip. Finally, the filled and closed shells are separated in a cutting process.
  • FIG. 1 a section through a simple resealable packaging in the closed state without any goods to be packaged inserted therein is shown schematically.
  • This packaging has a shell 1 made of a composite material with a carrier layer made of plastic or aluminum and has a surrounding edge strip 2.
  • the shell 1 is closed by a multilayer film cover 3.
  • the closure takes place by means of a seal, with a sealing layer 4 located on the edge strip 2 being heat-sealed against a likewise sealable film 14, which covers the film lid 3 as the lowest layer, by means of a sealing seam 5.
  • the sealing layer 4 and the film 14 are advantageously made of polyethylene.
  • the foil lid 3 consists of a stabilizing upper film 6 and the sealing layer 4 overlying and individual as stack layers one by means of the edge strip 2 formed sealing film 7.
  • the upper film 1 a stable carrier layer of oriented respectively oriented polypropylene of a thickness of between 38 g / m 2 and 42 g / m 2 .
  • the sealing film 7 is therefore sealed with its underside onto the edge region 2 of the shell 1.
  • the top film 6 is connected to the sealing film 7 by means of an adhesive layer 8, a predetermined breaking line 9 being provided in the sealing film 7, for example by means of a laser beam, on which the top film 6 detaches from the edge areas of the sealing film 7 when the packaging is torn open.
  • the predetermined breaking line 9 is formed by an embossing made in the sealing film and cuts through the sealing film up to the barrier layer. It ends at the boundary between the adhesive and the Permanent glue.
  • the upper film 6 is homogeneously continuous up to the outer edge of the edge strip 2 and accordingly has no predetermined breaking line.
  • the sealing film 7 is a composite of a sealable polyethylene film 14 located below and a film layer 15 made of polyethylene terephthalate (PET) applied over it.
  • a layer 16 made of polyamide is provided over the PET film, through which the predetermined breaking line 9 passes.
  • the adhesive layer 8 has an inner central area 10 in which the upper film 6 is permanently bonded to the sealing film 7 with a permanent adhesive. With this permanently adhesive bond, the sealing film 7 remains attached to the upper film 6 in the frame of the central area as soon as the packaging is opened and tears open at the predetermined breaking line 9 ( Figure 2b ).
  • the adhesive layer 8 has an outer edge area 11, with the exception of a connecting section 12 ( Figure 5 ) a pressure sensitive adhesive (PSA) is provided in the edge area which enables reclosure.
  • PSA pressure sensitive adhesive
  • the exemplary embodiments described are provided with a metallization 17 which forms a barrier layer and which is vapor-deposited as a thin film on the PET film layer 15 located below.
  • the packages are each shown in the opened state, in which the layer formed by the pressure-sensitive adhesive has separated into layers 13a and 13b.
  • the predetermined breaking line 9 formed by laser cutting extends from below to the metallization 17, which should not be completely penetrated.
  • the metallization 17 only tears open at the breaking line 9 when it is opened for the first time.
  • FIG. 5 a plan view of a finished package is now shown as it is cut out from an arrangement of several packages.
  • the central area 18 having the permanent adhesive can be seen, which is delimited by the predetermined breaking line 19.
  • the predetermined breaking line 19 is formed by a laser cut which extends between the points 20 and 21 around a large part of the central area 18.
  • the laser cut takes out the connecting section 12, in which the upper film and the sealing film are permanently connected by means of the permanent adhesive.
  • the edge region 22, indicated by hatching is formed, in which the pressure-sensitive adhesive (PSA) enabling reclosure is provided.
  • PSA pressure-sensitive adhesive
  • the upper film forms a tear-open tab 23, with no adhesive being located between the sealing film and the tear-open tab formed by the upper film, but the sealing film being sealed to the edge area. In this way, the pull tab 23 can be easily lifted off.
  • the area of the circumferential seal between the shell and the sealing film is denoted by 24.
  • trough-like depressions (not shown) can be made which, due to the bottom that is recessed with respect to the edge, form areas which are excluded from the seal. In this way, tearing open the sealing film is simplified.
  • FIG. 6 a prefabricated multilayer composite film is shown for application to, in this case, six preformed trays.
  • the central areas 25, which are connected by means of the permanent adhesive, can be seen.
  • the edge regions 26 connected by means of pressure-sensitive adhesive are shown.
  • the shells that are still connected and equipped are covered with this prefabricated multilayer composite film and specifically sealed onto the edge strip 27. Finally, the filled and closed shells are separated in a cutting process.

Description

Die Erfindung betrifft eine wiederverschließbare Verpackung gemäß einem der Ansprüche 1 bis 13 und eine vorgefertigte mehrlagige Folie gemäß Anspruch 14.The invention relates to a resealable packaging according to one of claims 1 to 13 and a prefabricated multi-layer film according to claim 14.

Derartige wiederverschließbare Folienverpackungen sind an sich bekannt und werden beispielsweise für die Verpackung von Feuchttüchern benutzt. Der Vorteil dieser Verpackungen liegt darin, dass der Inhalt durch die Wiederverschließbarkeit vor Austrocknung geschützt ist. Eine solche Folienverpackungen ist beispielsweise aus der WO 2005/123535 A1 bekannt. Diese weist von oben durch die Oberfolie und von unten durch die Abdichtfolie hindurchreichende Sollbruchlinien in Form von Perforationen respektive von Einkerbungen auf, an denen sich die Oberfolie von der Abdichtfolie unter Verbleib des mit Haftkleber versehenen Bereiches löst. Auch aus der EP 1 103 488 A1 und dem US 2005/0276525 A1 ist eine Packung mit einer solchermaßen wiederverschließbaren Verpackung in recht einfacher Ausführungsform bekannt.Such resealable film packaging are known per se and are used, for example, for the packaging of wet wipes. The advantage of this packaging is that the contents are protected from drying out thanks to the resealability. Such a film packaging is for example from WO 2005/123535 A1 known. This has predetermined breaking lines extending through the top film from above and through the sealing film from below in the form of perforations or notches at which the top film detaches from the sealing film while the area provided with pressure-sensitive adhesive remains. Also from the EP 1 103 488 A1 and the US 2005/0276525 A1 a pack with such a reclosable packaging in a very simple embodiment is known.

Das generelle Problem bei den bislang bekannten Verpackungen liegt darin, dass die vor dem ersten Öffnen verschlossene Verpackung zwar dicht gegenüber Feuchtigkeitsdurchlass ist, dass sie jedoch keine ausreichende Dichtigkeit gegenüber Gasen, wie insbesondere Sauerstoff, Stickstoff oder CO2, aufweist. Diese Art der Verpackung ist somit kaum geeignet, um verderbliche Lebensmittel, wie Wurst oder Käse, dauerhaft zu schützen. Dies gilt vor allem deshalb, weil derartige Lebensmittel meist in Gasatmosphäre verpackt sind und es für die Haltbarkeit besonders wichtig ist, dass das schütze Gas möglichst nicht entweicht.The general problem with the previously known packaging is that the packaging closed before the first opening is tight against moisture permeability, but that it does not have sufficient tightness against gases, such as in particular oxygen, nitrogen or CO 2 . This type of packaging is therefore hardly suitable for permanently protecting perishable foods such as sausage or cheese. This is especially true because such foods are usually packaged in a gas atmosphere and it is particularly important for the shelf life that the protected gas does not escape as far as possible.

Ein weiterer Augenmerk liegt auch auf der Herstellung und Verarbeitung des mehrschichtigen Foliendeckels und in dem Prozess des Verpackens an sich. Ein solcher Prozess ist in der WO 01/04020 A1 offenbart, wo der mehrschichtige Foliendeckel unmittelbar vor dem Aufbringen auf der Schale aus zwei einzelnen Folienlagen zusammen laminiert wird. Bei einem solch einfachen laminierenden Prozess ist es kaum möglich, dem Foliendeckel eine individuelle Funktionalität bezüglich des späteren Öffnens und der Wiederverschließbarkeit zu geben.Another focus is on the manufacture and processing of the multilayer film lid and the packaging process itself. One such process is in the WO 01/04020 A1 discloses where the multilayer film lid is laminated together from two individual film layers immediately prior to being applied to the tray. With such a simple laminating process, it is hardly possible to give the foil lid an individual functionality with regard to later opening and resealability.

Die US 4 735 335 offenbart ein Band mit Deckeln für flachkantige, thermoplastische Behälter, umfassend ein erstes Band aus Aluminium und ein zweites thermoplastisches Band.the U.S. 4,735,335 discloses a tape with lids for flat edged thermoplastic containers comprising a first tape made of aluminum and a second thermoplastic tape.

Aufgabe der vorliegenden Erfindung ist es zunächst, eine wiederverschließbare Verpackung hoher Gasdichte vorzuschlagen, die sich mit einfachen Mitteln herstellen lässt, die dem darin verpackten Gut einen großen Schutz bietet und die vom Benutzer einfach und komfortabel zu handhaben ist. Zudem ist es Aufgabe der Erfindung, eine maschinell einfach zu verwendende Folie vorzuschlagen, mit der sich die erfindungsgemäße Verpackung realisieren lässt. Außerdem soll ein Verfahren zur Aufbringung des Foliendeckels auf eine Schale im Rahmen der Herstellung einer erfindungsgemäßen Verpackung vorgeschlagen werden.The object of the present invention is first of all to propose a resealable packaging with a high gas density which can be produced with simple means, which offers the goods packaged therein great protection and which is easy and convenient for the user to handle. In addition, it is the object of the invention to propose a film that is easy to use by machine and with which the packaging according to the invention can be realized. In addition, a method for applying the film cover to a tray in the context of the production of a packaging according to the invention is to be proposed.

Diese Aufgaben werden durch die wiederverschließbare Verpackung gemäß Anspruch 1 und die Folie nach Anspruch 14 gelöst. Besondere Ausführungsformen sind in den jeweiligen Unteransprüchen genannt.These objects are achieved by the resealable packaging according to claim 1 and the film according to claim 14. Special embodiments are mentioned in the respective subclaims.

Der Erfindung liegt zunächst der wesentliche Gedanke zu Grunde, dass die Oberfolie eine zuverlässig stabilisierende Schicht bildet, die dem Foliendeckel eine mechanische Steifigkeit gibt. Diese Anforderung wird erfindungsgemäß dadurch realisiert, dass die Oberfolie durchgängig homogen ist und bis zum Außenrand des Randstreifens keine Sollbruchlinie aufweist. Diese über die gesamte Verpackung "unverletzte" Oberfolie bietet die höchst mögliche Stabilität. Dabei wird die Oberfolie erfindungsgemäss von einer einzigen stabilen Schicht aus orientierter Polypropylen-Folie mit einer Stärke zwischen 38 g/m2 und 42 g/m2 gebildet, die produktspezifisch zusätzlich mit einem Label bedruckt und/oder lackiert sein kann.The invention is initially based on the essential idea that the upper film forms a reliably stabilizing layer that is attached to the film cover mechanical rigidity there. According to the invention, this requirement is realized in that the upper film is homogeneous throughout and has no predetermined breaking line up to the outer edge of the edge strip. This upper film, which is "undamaged" over the entire packaging, offers the highest possible stability. According to the invention, the top film is formed by a single stable layer of oriented polypropylene film with a thickness between 38 g / m2 and 42 g / m2, which can also be printed and / or lacquered with a label specific to the product.

Der weitere erfindungswesentliche Grundgedanke liegt in der speziellen Verteilung verschiedener Kleber innerhalb der Kleberschicht. Diese Verteilung ist derart, dass die Kleberschicht einen innen liegenden Zentralbereich aufweist, in dem die Oberfolie vermittels eines Permanentklebers dauerhaft mit der Abdichtfolie verklebt ist. Erfindungsgemäß ist weiter ein außen liegender Randbereich vorgesehen, in dem zumindest in den Abschnitten, wo sich die Oberfolie von der Abdichtfolie lösen soll, Oberfolie und Abdichtfolie vermittels eines Haftklebers, insbesondere eines PSA ("Pressure Sensitive Adhesive") lösbar und wiederverschließbar aufeinander geklebt sind. Ein solcher Haftkleber ermöglicht das mehrmalige Wiederverschließen der Verpackung durch Aufeinanderlegen von Oberfolie und Abdichtfolie.The further fundamental idea that is essential to the invention lies in the special distribution of different adhesives within the adhesive layer. This distribution is such that the adhesive layer has an inner central area in which the upper film is permanently bonded to the sealing film by means of a permanent adhesive. According to the invention, an outer edge area is also provided, in which, at least in the sections where the upper film is to detach from the sealing film, the upper film and the sealing film are releasably and resealably glued to one another by means of a pressure-sensitive adhesive, in particular a PSA ("Pressure Sensitive Adhesive"). Such a pressure-sensitive adhesive enables the packaging to be reclosed several times by laying the top film and sealing film on top of one another.

Die Sollbruchlinie im Folienstapel der Abdichtfolie ist nun zwischen dem Randbereich und dem Zentralbereich vorgesehen, so dass sich innerhalb der Sollbruchlinie der Permanentkleber und außerhalb der Sollbruchlinie der Haftkleber befindet. Die Sollbruchlinie entspräche damit der Grenze zwischen dem Haftkleber und dem Permanentkleber. Dabei ist darauf zu achten, dass die Sollbruchlinie nicht auf den mit Haftkleber versehenen Randbereich stößt. Es wäre hingegen unproblematisch, wenn sie am äußeren Rand des Zentralbereiches und damit noch ein wenig im Permanentkleber mündet. Auf diese Weise bleibt beim Aufreißen der Verpackung die Oberfolie mit der Abdichtfolie im Zentralbereich verhaftet.The predetermined breaking line in the foil stack of the sealing foil is now provided between the edge area and the central area, so that the permanent adhesive is located within the predetermined breaking line and the pressure sensitive adhesive is located outside the predetermined breaking line. The predetermined breaking line would thus correspond to the boundary between the pressure-sensitive adhesive and the permanent adhesive. Care must be taken that the predetermined breaking line does not come into contact with the edge area provided with adhesive. On the other hand, it would be unproblematic if it ends at the outer edge of the central area and thus a little bit in the permanent adhesive. In this way, when the packaging is torn open, the upper film remains adhered to the sealing film in the central area.

Vorteilhaft ist es, dass die Sollbruchlinie erfindungsgemäß von einer in der Abdichtfolie eingebrachten Prägung gebildet wird, weiche den Schichtenstapel der Abdichtfolie zumindest bis zur Barriereschicht durchtrennt. Diese kann mechanisch oder auch in einer besonderen Ausführungsform von unten mittels eines Laserstrahles in den Stapel aus Oberfolie und Abdichtfolie eingebracht werden.It is advantageous that, according to the invention, the predetermined breaking line is formed by an embossing made in the sealing film, which softens the stack of layers Sealing foil cut through at least up to the barrier layer. This can be introduced mechanically or, in a special embodiment, from below by means of a laser beam into the stack of upper film and sealing film.

Eine solche Anordnung von durchgängiger Oberfolie und an der Klebergrenze mündender Sollbruchlinie hat im Gegensatz zu den bislang bekannten gattungsgemäßen Verpackungen den großen Vorteil der erhöhten Gasdichte. Es hat sich nämlich heraus gestellt, dass der Haftkleber wegen der Kapillarwirkung insbesondere gegen den Durchtritt von N2 oder CO2 nicht gasdicht ist und es über den Weg einer als Schlitz oder Perforierung ausgebildeten Sollbruchlinie durch die Schicht des Haftklebers hindurch zu einem unerwünschten Gasaustausch kommt. Da dieser Weg gegen den Durchtritt von Feuchtigkeit verschlossen ist, hat dieses Problem die Funktionalität der bekannten gattungsgemäßen Verpackungen bislang noch nicht beeinträchtigt. So waren die gattungsgemäßen Verpackungen im Hinblick auf eine möglichst kleine aber dennoch komfortable Entnahmeöffnung und damit auf eine geringe Verdunstung im geöffneten Zustand optimiert. Aus diesem Grunde war es bei den bekannten Verpackungen notwendig, eine Sollbruchlinie nicht nur "von unten" durch die Abdichtfolie, sondern auch "von oben" durch die Oberfolie vorzusehen, was nicht nur die Fertigung erschwert, sondern vor allem auch die Gasdichte stark mindert. Hingegen sind die erfindungsgemäßen Verpackungen bezüglich ihrer Gasdichte im original verschlossenen Zustand optimiert. Auf diese Weise ist eine lange Haltbarkeit der in der Verpackung gelagerten Lebensmittel möglich.Such an arrangement of a continuous upper film and a predetermined breaking line opening at the adhesive boundary has the great advantage of increased gas density in contrast to the previously known generic packaging. It has been found that the pressure-sensitive adhesive is not gas-tight due to the capillary action, in particular against the passage of N 2 or CO 2 , and an undesired gas exchange occurs via a predetermined breaking line designed as a slot or perforation through the layer of the pressure-sensitive adhesive. Since this path is closed against the passage of moisture, this problem has not yet impaired the functionality of the known generic packaging. Thus, the generic packaging was optimized with regard to the smallest possible but nevertheless comfortable removal opening and thus low evaporation in the open state. For this reason, it was necessary in the known packaging to provide a predetermined breaking line not only "from below" through the sealing film, but also "from above" through the upper film, which not only complicates production, but also greatly reduces the gas density. In contrast, the packaging according to the invention is optimized with regard to its gas density in the originally closed state. This enables the food stored in the packaging to have a long shelf life.

Dabei ist es im Hinblick auf die hohe Gasdichtigkeit besonders vorteilhaft, wenn der die Abdichtfolie bildende Schichtstapel eine besonders konzipierte Barriereschicht aufweist, die eine besondere Dichte gegenüber der Diffusion von Sauerstoff, Stickstoff oder Kohlendioxyd aufweist. Für den Aufbau einer solchen Barriereschicht bietet es sich an, auf eine Kunststoffschicht eine Metallisierung aufzudampfen. Beispielsweise kann auf eine Lage PET (Polyethylenterphthalat) eine Aluminiumschicht einer Dicke zwischen 5 nm und 10 nm aufgedampft werden. Dabei kann es von Vorteil sein, wenn diese Metallisierung die oberste Schicht der Abdichtfolie ausbildet. Die Sollbruchlinien werden dann idealerweise so vorsichtig "von unten" an die Metallisierung herangeführt, dass diese nicht durchdrungen sondern allenfalls angeprägt wird und damit gasdicht bleibt. Die Metallisierung kann in einer besonders vorteilhaften Ausführungsform von einer weiteren Lage Polyamid bedeckt sein.With regard to the high gas tightness, it is particularly advantageous if the layer stack forming the sealing film has a specially designed barrier layer which has a particular density with respect to the diffusion of oxygen, nitrogen or carbon dioxide. For the construction of such a barrier layer, it is advisable to vapor-deposit a metallization onto a plastic layer. For example, an aluminum layer with a thickness between 5 nm and 10 nm can be vapor-deposited onto a layer of PET (polyethylene terephthalate) will. It can be advantageous if this metallization forms the top layer of the sealing film. The predetermined breaking lines are then ideally brought up to the metallization "from below" so carefully that it is not penetrated, but is at most embossed and thus remains gas-tight. In a particularly advantageous embodiment, the metallization can be covered by a further layer of polyamide.

Die aufgedampfte Metallisierung innerhalb der Barriereschicht kann auch durch eine ebenfalls aufgedampfte Oxydschicht, insbesondere eine Schicht aus Metalloxyd, wie AlOx, oder eine Schicht aus Halbleiteroxyd, insbesondere SiOx, ersetzt werden. Alternativ dazu kann als Barriereschicht eine entsprechend stärker dimensionierte Kunststoffschicht, insbesondere aus Polyamid, vorgesehen werden.The vapor-deposited metallization within the barrier layer can also be replaced by a likewise vapor-deposited oxide layer, in particular a layer of metal oxide, such as AlO x , or a layer of semiconductor oxide, in particular SiO x . As an alternative to this, a correspondingly thicker plastic layer, in particular made of polyamide, can be provided as the barrier layer.

Eine weitere Besonderheit der erfindungsgemäßen Verpackung liegt darin, dass das "Foliensandwich", also der Stapel, aus Oberfolie und Abdichtfolie im Vorhinein als Folienverbund fertiggestellt werden und in einer vorkonfektionierten Rolle zur weiteren Verwendung an die Verpackungsmaschine geliefert werden kann. Die Verpackungsmaschine, die vorteilhafterweise während des Verpackungsprozess auch die Schalen formt und befüllt, kann dann in einem dem Verschließen der Schalen dienenden Schritt die gefüllten Schalen mit der vorgefertigten mehrlagigen Verbundfolie überdecken und diese an den Randstreifen der Schalen versiegeln. Eine solche Vorgehensweise ist besonders effektiv und kostengünstig. Im Rahmen dieses Folienverbundes können auch besonders biokompatible Kunststoffe, wie PLA ("Polylactid"), eingesetzt werden.Another special feature of the packaging according to the invention is that the "film sandwich", i.e. the stack, made up of the upper film and the sealing film can be finished in advance as a film composite and delivered to the packaging machine in a pre-assembled roll for further use. The packaging machine, which advantageously also forms and fills the trays during the packaging process, can then cover the filled trays with the prefabricated multilayer composite film in a step serving to close the trays and seal them on the edge strips of the trays. Such a procedure is particularly effective and inexpensive. Particularly biocompatible plastics, such as PLA ("polylactide"), can also be used within the framework of this film composite.

Allerdings ist dazu eine entsprechend vorgefertigte mehrlagige Verbundfolie notwendig, die zur Aufbringung auf eine vorgeformte Schale und damit zur Herstellung einer erfindungsgemäßen Verpackung insofern geeignet ist, als sie die notwendige Strukturierung innerhalb der Kleberschicht bezüglich der Verteilung von Permanentkleber und Haftkleber aber auch die Ausbildung einer Aufreißecke vorn herein beinhaltet. Eine solche mehrlagige Verbundfolie umfasst entsprechend die Oberfolie und die mit Sollbruchlinien versehene Abdichtfolie. Oberfolie und Abdichtfolie sind nun derart mittels der verschiedenen Kleber aufeinandergeklebt, dass in denjenigen Bereichen, die bei der späteren fertigen Verpackung die Zentralbereiche darstellen, ein Permanentkleber vorhanden ist, der Oberfolie und Abdichtfolie unlöslich verbindet Hingegen sind die Oberfolie und die Abdichtfolie in den Bereichen, die bei der späteren Verpackung Randbereiche darstellen, mittels eines Haftklebers lösbar und wiederverschließbar verbunden. Entsprechend können Aufreißlaschen und Verbindungsabschnitte von vorn herein vorgesehen werden.However, an appropriately prefabricated multilayer composite film is necessary for this, which is suitable for application to a preformed shell and thus for the production of packaging according to the invention insofar as it provides the necessary structuring within the adhesive layer with regard to the distribution of permanent adhesive and pressure sensitive adhesive, but also the formation of a tear corner at the front in includes. Such a multilayer composite film accordingly comprises the top film and the sealing film provided with predetermined breaking lines. Upper film and Sealing foils are now glued to one another by means of the various adhesives in such a way that a permanent adhesive is present in those areas that represent the central areas in the later finished packaging, which permanently connects the upper foil and the sealing foil Later packaging represent edge areas, releasably and resealably connected by means of a pressure-sensitive adhesive. Accordingly, tear tabs and connecting sections can be provided from the start.

Mit einer solchen Verbundfolie bietet sich ein Verpackungsverfahren für ein insbesondere in Scheiben vorliegendes Lebensmittel, wie einen Stapel von Käse- oder Wurstscheiben, mit nachfolgenden Schritten an: Zunächst wird in einem ersten Schritt das zur Herstellung der Schalen eingesetzte Verbundmaterial zu einer Anordnung mehrerer über ihren Randbereich verbundener Schalen geformt. Dabei weist das Verbundmaterial vorteilhafterweise eine Siegelschicht, insbesondere aus Polyethylen, auf. Das Formen geschieht insbesondere durch einen Tiefziehprozess. In einem weiteren Schritt werden dann die derart geformten Schalen mit dem Lebensmittel bestückt. Die noch verbundenen und bestückten Schalen werden nachfolgend mit der vorgefertigten mehrlagigen Verbundfolie überdeckt und gezielt auf den Randstreifen versiegelt. Zuletzt werden die gefüllten und verschlossenen Schalen in einem Schneidvorgang vereinzelt.With such a composite film, a packaging method for a food in particular in slices, such as a stack of cheese or sausage slices, offers the following steps: First, in a first step, the composite material used to produce the shells is arranged in several over their edge area connected shells. The composite material advantageously has a sealing layer, in particular made of polyethylene. Shaping takes place in particular by means of a deep-drawing process. In a further step, the bowls shaped in this way are then equipped with the food. The shells that are still connected and equipped are then covered with the prefabricated multilayer composite film and specifically sealed on the edge strip. Finally, the filled and closed shells are separated in a cutting process.

Nachfolgend wird die Erfindung anhand der Figuren 1 bis 5 näher erläutert. Es zeigen:

Figur 1:
ein Schnitt durch eine einfache Verpackung,
Figur 2:
eine Verpackung mit einer weiteren Folienlage in Schnittansicht,
Figur 3:
eine Verpackung mit metallisierter Zwischenschicht in Schnittansicht,
Figur 4:
eine Verpackung mit metallisierter Zwischenschicht und weiterer Folienlage in Schnittansicht,
Figur 5:
eine Verpackung in Draufsicht und
Figur 6:
eine Verbundfolie.
The invention is based on the Figures 1 to 5 explained in more detail. Show it:
Figure 1:
a section through a simple package,
Figure 2:
a packaging with another layer of film in a sectional view,
Figure 3:
a packaging with a metallized intermediate layer in a sectional view,
Figure 4:
a packaging with a metallized intermediate layer and another layer of film in a sectional view,
Figure 5:
a packaging in plan view and
Figure 6:
a composite film.

In Figur 1 ist zunächst ein Schnitt durch eine einfache wiederverschließbare Verpackung in geschlossenem Zustand ohne darin eingelegtes zu verpackendes Gut schematisch dargestellt. Diese Verpackung weist eine Schale 1 aus einem Verbundmaterial mit einer Trägerschicht aus Kunststoff oder Aluminium auf und hat einen umgebenden Randstreifen 2. Die Schale 1 ist von einem mehrschichtigen Foliendeckel 3 verschlossen. Der Verschluss geschieht durch eine Versiegelung, wobei eine auf dem Randstreifen 2 befindliche Siegelschicht 4 gegen eine den Foliendeckel 3 als unterste Schicht bedeckende ebenfalls siegelfähige Folie 14 vermittels einer Siegelnaht 5 heißgesiegelt wird. Die Siegelschicht 4 und die Folie 14 sind vorteilhafterweise aus Polyethylen.In Figure 1 a section through a simple resealable packaging in the closed state without any goods to be packaged inserted therein is shown schematically. This packaging has a shell 1 made of a composite material with a carrier layer made of plastic or aluminum and has a surrounding edge strip 2. The shell 1 is closed by a multilayer film cover 3. The closure takes place by means of a seal, with a sealing layer 4 located on the edge strip 2 being heat-sealed against a likewise sealable film 14, which covers the film lid 3 as the lowest layer, by means of a sealing seam 5. The sealing layer 4 and the film 14 are advantageously made of polyethylene.

Der Foliendeckel 3 besteht aus einer stabilisierenden Oberfolie 6 und eine auf dem Randstreifen 2 vermittels der Siegelschicht 4 aufliegende und als Stapel einzelner Schichten ausgebildete Abdichtfolie 7. Erfindungsgemäss ist die Oberfolie 1 eine stabile Trägerschicht aus orientiertem respektive verstreckten Polypropylen einer Stärke zwischen 38 g/m2 und 42 g/m2. Die Abdichtfolie 7 ist daher mit ihrer Unterseite auf den Randbereich 2 der Schale 1 aufgesiegelt.The foil lid 3 consists of a stabilizing upper film 6 and the sealing layer 4 overlying and individual as stack layers one by means of the edge strip 2 formed sealing film 7. According to the invention the upper film 1 a stable carrier layer of oriented respectively oriented polypropylene of a thickness of between 38 g / m 2 and 42 g / m 2 . The sealing film 7 is therefore sealed with its underside onto the edge region 2 of the shell 1.

Die Oberfolie 6 ist mit der Abdichtfolie 7 vermittels einer Kleberschicht 8 verbunden, wobei in der Abdichtfolie 7 eine beispielsweise mittels eines Laserstrahles in die Verbundfolie eingebrachte Sollbruchlinie 9 vorgesehen ist, an der sich beim Aufreißen der Verpackung die Oberfolie 6 von Randbereichen der Abdichtfolie 7 löst. Die Sollbruchlinie 9 wird von einer in der Abdichtfolie eingebrachten Prägung gebildet und durchtrennt die Abdichtfolie bis zur Barriereschicht. Sie mündet an der Grenze zwischen dem Haftkleber und dem Permanentkleber. Die Oberfolie 6 ist bis zum Außenrand des Randstreifens 2 homogen durchgängig und weist entsprechend keine Sollbruchlinie auf.The top film 6 is connected to the sealing film 7 by means of an adhesive layer 8, a predetermined breaking line 9 being provided in the sealing film 7, for example by means of a laser beam, on which the top film 6 detaches from the edge areas of the sealing film 7 when the packaging is torn open. The predetermined breaking line 9 is formed by an embossing made in the sealing film and cuts through the sealing film up to the barrier layer. It ends at the boundary between the adhesive and the Permanent glue. The upper film 6 is homogeneously continuous up to the outer edge of the edge strip 2 and accordingly has no predetermined breaking line.

Im Ausführungsbeispiel nach Figur 1 ist die Abdichtfolie 7 ein Verbund einer unten liegenden siegelfähigen Polyethylen Folie 14 und einer darüber aufgebrachten Folienlage 15 aus Polyethylenterephthalat (PET). Im Ausführungsbeispiel nach den Figuren 2 ist zusätzlich zu diesen Folienlagen über der PET Folie noch eine Lage 16 aus Polyamid vorgesehen, durch weiche die Sollbruchlinie 9 hindurch geht.In the embodiment according to Figure 1 the sealing film 7 is a composite of a sealable polyethylene film 14 located below and a film layer 15 made of polyethylene terephthalate (PET) applied over it. In the embodiment according to Figures 2 In addition to these film layers, a layer 16 made of polyamide is provided over the PET film, through which the predetermined breaking line 9 passes.

Die Kleberschicht 8 hat einen innen liegenden Zentralbereich 10, in dem die Oberfolie 6 mit einem permanent haftenden Kleber unlösbar mit der Abdichtfolie 7 verklebt ist. Mit dieser permanent haftenden Verklebung verbleibt die Abdichtfolie 7 im Rahmen des Zentralbereiches an der Oberfolie 6 verhaftet, sobald die Verpackung geöffnet wird und an der Sollbruchlinie 9 aufreist (Figur 2b). Zudem hat die Kleberschicht 8 einen außen liegenden Randbereich 11, wobei mit Ausnahme eines Verbindungsabschnittes 12 (Figur 5) im Randbereich ein den Wiederverschluss ermöglichender Haftkleber (PSA, "pressure sensitive adhesive") vorgesehen ist. Die Sollbruchlinie 9 mündet somit an der Grenze zwischen dem Randbereich 11 dem Zentralbereich 10. In Figur 2b ist mit 13a und 13b angedeutet, dass Teile des PSA im Randbereich jeweils an Oberfolie 6 und Abdichtfolie 7 verbleiben.The adhesive layer 8 has an inner central area 10 in which the upper film 6 is permanently bonded to the sealing film 7 with a permanent adhesive. With this permanently adhesive bond, the sealing film 7 remains attached to the upper film 6 in the frame of the central area as soon as the packaging is opened and tears open at the predetermined breaking line 9 ( Figure 2b ). In addition, the adhesive layer 8 has an outer edge area 11, with the exception of a connecting section 12 ( Figure 5 ) a pressure sensitive adhesive (PSA) is provided in the edge area which enables reclosure. The predetermined breaking line 9 thus ends at the border between the edge area 11 and the central area 10 Figure 2b 13a and 13b indicate that parts of the PSA remain in the edge area on the upper film 6 and sealing film 7, respectively.

Entsprechend den Figuren 3 und 4 sind die beschriebenen Ausführungsbeispiele mit einer eine Barriereschicht bildenden Metallisierung 17 versehen, die als dünner Film auf die darunter liegende PET Folienlage 15 aufgedampft ist. Die Verpackungen sind jeweils im geöffneten Zustand gezeigt, in dem sich die von dem Haftkleber gebildete Schicht in die Schichten 13a und 13b getrennt hat. Die durch Laserschneiden gebildete Sollbruchlinie 9 reicht von unten bis an die Metallisierung 17 heran, die nicht komplett durchdrungen sein soll. Die Metallisierung 17 reißt an der Solibruchlinie 9 erst durch das erste Öffnen auf.According to the Figures 3 and 4 the exemplary embodiments described are provided with a metallization 17 which forms a barrier layer and which is vapor-deposited as a thin film on the PET film layer 15 located below. The packages are each shown in the opened state, in which the layer formed by the pressure-sensitive adhesive has separated into layers 13a and 13b. The predetermined breaking line 9 formed by laser cutting extends from below to the metallization 17, which should not be completely penetrated. The metallization 17 only tears open at the breaking line 9 when it is opened for the first time.

In Figur 5 ist nunmehr eine Draufsicht auf eine fertige Verpackung gezeigt, wie sie aus einer Anordnung mehrerer Verpackung ausgeschnitten ist. Zu erkennen ist zunächst der den Permanentkleber aufweisende Zentralbereich 18, der begrenzt ist von der Sollbruchlinie 19. Die Sollbruchlinie 19 wird gebildet von einem Laserschnitt, der sich zwischen den Punkten 20 und 21 um einen Großteil des Zentralbereiches 18 erstreckt. Der Laserschnitt nimmt den Verbindungsabschnitt 12 aus, in dem die Oberfolie und die Abdichtfolie vermittels des Permanentklebers unlösbar verbunden sind. Jenseits der durch die Sollbruchlinie 19 gebildeten Grenze bildet sich der durch Schraffur angedeutete Randbereich 22 aus, in dem der den Wiederverschluss ermöglichende Haftkleber (PSA) vorgesehen ist. Über diesen Bereich kann die Verpackung wiederverschließbar geöffnet werden.In Figure 5 a plan view of a finished package is now shown as it is cut out from an arrangement of several packages. First of all, the central area 18 having the permanent adhesive can be seen, which is delimited by the predetermined breaking line 19. The predetermined breaking line 19 is formed by a laser cut which extends between the points 20 and 21 around a large part of the central area 18. The laser cut takes out the connecting section 12, in which the upper film and the sealing film are permanently connected by means of the permanent adhesive. Beyond the border formed by the predetermined breaking line 19, the edge region 22, indicated by hatching, is formed, in which the pressure-sensitive adhesive (PSA) enabling reclosure is provided. The packaging can be re-opened via this area.

In der dem Verbindungsabschnitt 12 gegenüber liegenden Ecke bildet die Oberfolie eine Aufreißlasche 23 aus, wobei sich zwischen der Abdichtfolie und der von der Oberfolie gebildeten Aufreißlasche kein Kleber befindet, die Abdichtfolie jedoch an den Randbereich angesiegelt ist. So kann die Aufreißlasche 23 bequem abgehoben werden. Der Bereich der umlaufenden Siegelung zwischen Schale und Abdichtfolie ist mit 24 bezeichnet. Im Randbereich der Schale können nicht dargestellte muldenartige Vertiefungen eingebracht werden, die aufgrund des gegenüber dem Rand vertieften Bodens von der Siegelung ausgenommene Bereich bilden. Auf diese Weise wird das Aufreißen der Abdichtfolie vereinfacht.In the corner opposite the connecting section 12, the upper film forms a tear-open tab 23, with no adhesive being located between the sealing film and the tear-open tab formed by the upper film, but the sealing film being sealed to the edge area. In this way, the pull tab 23 can be easily lifted off. The area of the circumferential seal between the shell and the sealing film is denoted by 24. In the edge area of the bowl, trough-like depressions (not shown) can be made which, due to the bottom that is recessed with respect to the edge, form areas which are excluded from the seal. In this way, tearing open the sealing film is simplified.

In Figur 6 ist eine vorgefertigte mehrlagige Verbundfolie zur Aufbringung auf in diesem Fall sechs vorgeformten Schalen gezeigt. Zu erkennen sind die Zentralbereiche 25, die mittels des Permanentklebers verbunden sind. Zudem sind die mittels Haftkleber verbunden Randbereiche 26 darstellt. Die noch verbundenen und bestückten Schalen werden mit dieser vorgefertigten mehrlagigen Verbundfolie überdeckt und gezielt auf den Randstreifen 27 versiegelt. Zuletzt werden die gefüllten und verschlossenen Schalen in einem Schneidvorgang vereinzelt.In Figure 6 a prefabricated multilayer composite film is shown for application to, in this case, six preformed trays. The central areas 25, which are connected by means of the permanent adhesive, can be seen. In addition, the edge regions 26 connected by means of pressure-sensitive adhesive are shown. The shells that are still connected and equipped are covered with this prefabricated multilayer composite film and specifically sealed onto the edge strip 27. Finally, the filled and closed shells are separated in a cutting process.

Claims (14)

  1. Reclosable packaging for a product to be packaged, in particular for sliced foodstuff, such as slices of cheese or sausage, comprising a tray (1) provided with an edge strip (2) and comprising a multilayer film lid (3) adhering to the edge strip (2), wherein the film lid (3) comprises at least one top film (6) and a sealing film (7) in the form of a layer stack resting on the edge strip (2), wherein top film (6) and sealing film (7) are connected by means of an adhesive layer (8), wherein the sealing film (7) has a predetermined breaking line (9), and wherein the top film (6) detaches from parts of the sealing film (7) within the adhesive layer (8) when the package is torn open,
    and the top film (6)
    is homogeneous throughout up to the outer edge of the edge strip (2), and has no predetermined breaking line up to the outer edge of the edge strip, that the adhesive layer (8) has an inner central region (10) and an outer edge region (11), wherein a permanent adhesive is provided in the central region (10) and, at least in sections of the edge region (11), a pressure-sensitive adhesive enabling reclosure is provided, and wherein the predetermined breaking line (9) is provided between the edge region (11) and the central region (10), and wherein, when the packaging is torn open, the top film (6) remains adhered to the sealing film (7) in the central region (10), characterized in that the top film (6) forms a stable carrier layer and is formed by an oriented or stretched polypropylene film, respectively, having a thickness between 38 g/m2 and 42 g/m2.
  2. The packaging according to claim 1, characterized in that the layer stack of the sealing film (7) has a barrier layer for preventing the passage of gas, the barrier layer being impermeable in particular to air, oxygen and carbon dioxide.
  3. The packaging according to claim 2, characterized in that the barrier layer has a vapor-deposited metal layer (17), in particular of aluminum.
  4. The packaging according to claim 3, characterized in that the barrier layer has an oxide layer, in particular a layer of metal oxide, such as AlOx, or a layer of semiconductor oxide, in particular SiOx, or a plastic layer, in particular of polyamide.
  5. The packaging according to any one of the preceding claims, characterized in that the predetermined breaking line (9) is formed by an embossing introduced into the sealing film (7), which cuts through the sealing film (7), in particular at least as far as the barrier layer, without destroying the barrier layer.
  6. The packaging according to claim 5, characterized in that the predetermined breaking line (9) is formed by a cut made in the stack of top film (6) and sealing film (7) facing the tray by means of a laser beam.
  7. The packaging according to any one of the preceding claims, characterized in that the layer stack of the sealing film (7) has a sealing layer (14), in particular of polyethylene, to be sealed with the edge strip (2), and a stabilising layer (15), in particular of polyester.
  8. The packaging according to any one of the preceding claims, characterized in that the tray (1) is made of a composite material, in particular having a carrier layer of plastic or aluminum, wherein the layer of the composite material facing the inside of the tray is a sealable layer (4).
  9. The packaging according to claim 8, characterized in that the sealing film (7) is sealed onto the edge region (2) of the tray (1) with its underside facing away from the barrier layer.
  10. The packaging according to claim 9, characterized in that trough-like depressions are made in the edge region (2) of the tray, which form regions excluded from the sealing.
  11. The packaging according to any one of the preceding claims, characterized in that the top film forms a tear-open tab (23), wherein there is no adhesive between the sealing film and the tear-open tab (23).
  12. The packaging according to claim 11, characterized in that the outer edge of the sealing film is sealed to the edge region of the tray to allow the tear-open tab formed by the top film to be lifted off.
  13. The packaging according to any one of the preceding claims, characterized in that the top film and the sealing film are bonded in a bonding portion of the edge region by means of the permanent adhesive.
  14. A prefabricated multilayer film for application to a preformed tray for preparing a packaging according to any one of claims 1 to 13, wherein the multilayer film comprises a top film and a sealing film provided with predetermined breaking lines, wherein the top film and the sealing film are bonded by means of a permanent adhesive in predetermined regions which represent the central regions, and that the top film and the sealing film are bonded in other regions, which represent the edge regions, by means of a pressure-sensitive adhesive, characterized in that the top film (6) forms a stable carrier layer and is formed by an oriented or stretched polypropylene film, respectively, having a thickness between 38 g/m2 and 42 g/m2.
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FR2801571B1 (en) 1999-11-26 2002-02-15 Danisco Flexible France RECLOSABLE PACKAGE SHEET AND RECLOSABLE PACKAGE COMPRISING SAME
ES2288592T3 (en) * 2003-02-19 2008-01-16 ALCAN TECHNOLOGY & MANAGEMENT LTD. CONTAINER CONTAINER WITH A CONTAINER SHEET WITH INTEGRATED SYSTEM OF OPENING AND CLOSING AGAIN.
US7717620B2 (en) * 2004-06-11 2010-05-18 Sonoco Development, Inc. Flexible packaging structure with a built-in opening and reclose feature, and method for making same
US7681732B2 (en) * 2008-01-11 2010-03-23 Cryovac, Inc. Laminated lidstock

Also Published As

Publication number Publication date
EP2347972A1 (en) 2011-07-27
ES2899659T3 (en) 2022-03-14
DE102010005554A1 (en) 2011-07-28
DE202011109904U1 (en) 2012-07-02

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