DE202018106618U1 - Foil for the production of a packaging tray - Google Patents

Abstract

Film (2) for producing a packaging tray (4) with a plastically deformable carrier layer (14) containing amorphous and / or glycol-modified polyethylene terephthalate, characterized in that on a top side (16) of the deformable carrier layer (14) comprises a lacquer layer a sealing wax (18) is provided.

Description

The invention relates to a film for producing a packaging tray according to the preamble of claim 1, a packaging tray, in particular a packaging tray which can be closed by a cover film, and a packaging produced with the packaging tray, in particular a food packaging. In this case, the packaging shell has a plastically deformable carrier layer containing amorphous polyethylene terephthalate and / or glycol-modified polyethylene terephthalate.

Such films are particularly common in the production of packaging, especially food packaging. The films are thereby used in the form of rolls or in a sheet format in appropriate packaging systems, which form the desired packaging trays from the material supply provided in this form and optionally separate. The plastic deformation of the relevant film areas can be done for example by deep drawing.

Subsequently, the packaging trays produced in this way, for example, within the same packaging system, filled with a product and sealed in a further step by means of a cover sheet. In this case, the cover film is usually connected to a peripheral edge of the packaging shell, such as by producing an adhesive, welding or sealing compound. Depending on the type of connection, the product packaging produced in this way can either be tightly closed or be manually opened by removing the cover film. In addition, reclosing of the product packaging, such as provided by a reusable adhesive area.

Out WO2016 / 144308A1 is a food packaging known which has a packaging shell and a peelable attached thereto closing foil. In order to be able to recycle the packaging tray as simply and completely as possible, it is produced in one layer from an amorphous polyethylene terephthalate (APET). In order to produce a heat-seal connection with a sealing edge formed on the packaging shell, the closing film additionally comprises an inner layer of polyester copolymer lacquer layer, which can be heat-sealed with the APET of the packaging shell, in addition to an APET layer and a layer of oriented PET.

In particular, in the packaging of foodstuffs, it is important regardless of the connection, that the cover sheet is circumferentially tightly connected to the packaging shell to ensure a certain shelf life of the recorded product can. In the case of the known food packaging, in particular fat-containing droplets or minute particles prove to be problematical, which can reach between the cover film and the packaging tray during the filling of the packaging tray into the connecting region to be produced. For some food products, in particular meat or sausage products, in the packaging of which critical amounts of these fatty droplets or very small particles may already be present in the ambient air of the packaging to be produced or are released from the product itself, said food packaging is therefore only conditionally or not at all suitable.

In order to be able to produce a secure connection between the packaging shell and cover film in the heat sealing process even with such food products despite the possible fat deposits, packaging trays are known which have a layer of a material at least in the connection region, which also in the presence of fat easily by heat sealing with the cover film connect, such as polyethylene. However, the disadvantage of these multilayered packaging trays is again that they can only be recycled insufficiently.

The object of the invention is to avoid the disadvantages mentioned in a generic film or a packaging shell to be produced therefrom and both to ensure a secure and tight connection by heat sealing and to allow as complete as possible recycling.

This object is achieved by a film having the features of claim 1. In this case, a lacquer layer of a sealing lacquer is provided on an upper side of the deformable carrier layer. By using such a film, it is possible to produce a packaging shell by plastic deformation, which can be easily and safely connected by heat-sealing with different lower-side material layers of cover sheets. In this way, the packaging tray produced from the film can also be used for the packaging of high-fat or during the packaging process strongly fat-secreting food products, such as sausage and meat products. At the same time, a packaging tray produced from such a film can be recycled in a particularly simple and almost complete manner since, in addition to the carrier layer produced from amorphous polyethylene terephthalate or with glycol-modified polyethylene terephthalate, in the Essentially only has the applied sealing wax.

In a particularly advantageous embodiment, the lacquer layer is applied over the entire top surface of the carrier layer nationwide. As a result, the film can be produced particularly easily, wherein the sealing wax can be applied for example in a gravure or flexographic printing or doctor systems. In any case, the film can be rolled up easily after its production, in which case the film rolls produced in this way can in turn be used in a particularly simple and flexible manner also in different packaging systems or for different packaging sizes and shapes. As a result of the blanket and even extension of the lacquer layer, a consistently high quality of the compound to be produced, in particular by heat sealing, can be ensured regardless of the final position of the region of the foil that can be connected with a closing foil.

It is advantageous if the sealing wax is formed by a lacquer which is selected from the group consisting of water-based sealing lacquers, solvent-based sealing lacquers, solvent-free sealing lacquers, biological sealing lacquers and / or polymer-based sealing lacquers. In this way, a particularly uniform application of the lacquer layer on the carrier layer can be ensured.

The water-based sealing lacquers may be in particular vinyl-based, acrylic-based, polyamide-based, polyester-based, rubber-based, gum-based, polyurethane-based, starch-based, protein-based, in particular casein-based, lignin-based, polyvinyl alcohol-based and / or polyethylene copolymer base.

The solvent-based sealants or adhesives may in particular be vinyl-based, acrylic-based, polyamide-based, polyester-based, rubber-based, gum-based, polyurethane-based, nitrocellulose-based, cellulose acetate-based, polyisobutylene-based, and / or polyethylene copolymerizate base.

The solvent-free sealing lacquers or adhesives may in particular be vinyl-based, acrylic-based, polyamide-based, polyester-based, rubber-based, gum-based, polyurethane-based, nitrocellulose-based, cellulose acetate-based, polyisobutylene-based, and / or polyethylene copolymerizatebasis.

The biological sealing lacquers or adhesives may in particular be starch-based, dextrin-based, protein-based, lignin-based, natural rubber-based, gelatin-based, nitrocellulose-based, cellulose acetate-based and / or based on PLA, anhydride-modified ethylene acrylate copolymer, anhydride-modified ethylene vinyl acetate copolymer, ethylene acrylic acid Copolymer and / or ethylene vinyl acetate copolymer be prepared.

The polymer-based sealing lacquers or adhesives can be produced in particular by acrylates, vinyl acetates or based on epoxy resin or polyurethane.

In a particularly preferred embodiment, the sealing lacquer is produced from a water-based lacquer selected from the group consisting of vinyl-based, acrylic-based, polyester-based and / or polyurethane-based lacquers. By using such a sealing lacquer, it is possible to ensure a sufficiently stable or tight connection of the packaging shell produced from the foil with a closing foil.

In addition, it is favorable if the carrier layer has a content of polyethylene terephthalate of at least 90% by weight, in particular of at least 95% by weight, in order to be able to recycle a particularly high proportion of the packaging tray produced from the film.

In this case, it is particularly preferred if the carrier layer is made entirely of polyethylene terephthalate, with the exception of additives having a proportion of not more than 3% by weight, so that a packaging tray produced from the film can be substantially completely recycled, except for the additives used in each case.

Advantageously, the sealing wax has a layer thickness of 1 to 10 .mu.m, in order to ensure a trouble-free heat-sealing process and sufficient stability of the heat-seal connection produced.

In addition, the stated object is achieved by a packaging shell, which is made of a film in one of the aforementioned embodiments, wherein a receiving area for a product is produced by plastic deformation of the film. As a result of the plastic deformation of the film, a receptacle suitable for the respective product to be picked up can thus be made available. This ensures, for example, that the recorded product is held stable position while having a favorable appearance for sale.

It is advantageous if the receiving area is formed by a deep-drawn portion of the film. By making the In a conventional thermoforming process, even relatively complex shapes can be produced inexpensively and in a short processing time.

In a further advantageous embodiment, a peripheral sealing edge is formed, which can be circumferentially connected by means of heat sealing with a sealable against the sealing wax material or paint. Due to the formation of such a sealing edge, it is possible to ensure a particularly high level of tightness of the produced heat-seal connection between the lacquer layer of sealing wax provided on the side of the packaging shell and the material or lacquer of the closing foil cooperating therewith.

Furthermore, the stated object is achieved by a packaging having a packaging shell in one of the aforementioned embodiments and a product accommodated therein, wherein a cover film is attached to the sealing edge by means of a heat-sealing connection. By using the packaging tray with the sealing wax provided thereon and the heat seal compound produced with the aid thereof, this packaging is relatively insensitive to grease or lubricant-containing particles and droplets which can settle in the connection region during the production of the connection between sealing edge and cover film.

Advantageously, the heat seal compound is formed peelable. For example, additives may be provided for this purpose in the connection region between sealing edge and cover film which are part of the sealable material or paint on the part of the packaging shell and / or on the cover film and act as a disruptive product in the connection region. In this way, a simple manual opening of the package is made possible.

Alternatively, it is advantageous if the heat-sealing connection is designed as a permanently fixed connection. In this way, a particularly dense and stable connection between the packaging shell and the cover film can be ensured.

In a further alternative embodiment, the heat-sealing connection is formed at least as part of a resealable connection. In this case, for example, a particularly tightly closed part of the connection can be separated when the packaging is opened for the first time. Subsequently, reclosing over the same or an adjacently formed part of the connection is possible, on which, for example, corresponding, reusable adhesives are provided.

It is in any case favorable if the heat-sealing connection between the sealing wax of the packaging tray and a material layer is made on a lower side of the cover film, which is selected from a material of the group consisting of PE, PP, PET and sealing wax. In this way, a particularly dense and stable connection between the underside of the cover sheet and the sealing wax of the packaging shell can be produced.

In a further advantageous embodiment, the cover film has a material structure from the group consisting of OPP (oriented polypropylene) / PE (polyethylene), OPP / PP (polypropylene), OPET (oriented polyethylene terephthalate) / PE, OPET / PP, OPA (oriented polyamide) / PE, OPA / PP, PA (Polyamide) / PE, PA / PP, PA / Sealing Wax, OPA / Sealing Wax, PET / Sealing Wax, OPP / Sealing Wax, OPET / PE / Sealing Wax, OPP / PE / Sealing Wax, OPA / PE / Sealing wax and OPET / OPET / sealing wax on. By using such a material structure, on the one hand, a trouble-free sealing process and, on the other hand, a sufficiently high stability of the cover film can be ensured.

The packaging is preferably designed as a food packaging with a food product accommodated therein. In this case, the food packaging is particularly suitable for safe packaging of foods that give off a relatively high fat content of the ambient air or directly in the connection area during the packaging process, such as sausage or meat products.

In a particularly advantageous embodiment, the ingested food product is formed by sausage or meat products, cheese or milk products, pasta, fruits, vegetables or seafood. Here, the food packaging and the food product received therein form a coordinated unit, which has improved properties in terms of shelf life and marketing and after consumption of the food product, at least for the most part can be recycled.

It should be noted that all features described above of the article according to the invention are interchangeable or combinable, provided that an exchange or a combination of the same is not excluded for technical reasons.

• 1 eine perspektivische Ansicht einer aus einer erfindungsgemäßen Folie hergestellten Verpackungsschale vor der Anbringung einer Deckfolie,
• 2 einen Schnitt durch einen Abschnitt eines herzustellenden Verbindungsbereichs zwischen der Verpackungsschale und der Deckfolie nach 1 und
• 3 eine perspektivische Ansicht einer aus der Verpackungsschale und der Deckfolie nach 1 hergestellte Lebensmittelverpackung mit einem darin aufgenommenen Lebensmittelprodukt.

In the figures, an exemplary embodiment of the invention is shown. Show it:

• 1 3 a perspective view of a packaging tray produced from a film according to the invention before the application of a cover film,
• 2 a section through a portion of a connection region to be produced between the packaging tray and the cover sheet after 1 and
• 3 a perspective view of one of the packaging tray and the cover sheet after 1 produced food packaging with a food product incorporated therein.

1 shows one from a slide 2 Packing tray produced by plastic deformation 4 , The plastic deformation can be produced by any known and suitable method, such as by partial deep drawing of the film 2 , In any case, this is a recording area 6 trained, in which a product can be included. Around an access opening 8th of the recording area 6 around is a sealing edge 10 formed, on which a cover sheet twelve can be attached to close the receiving area.

2 shows a portion of a connection region to be made between the seal edge 10 the packaging tray 4 and the cover sheet twelve , As can be seen from this, the film has 2 a material structure with a carrier layer 14 on, at the top 16 a layer of a sealing wax 18 is applied. Here is the sealing wax 18 preferably closed over the entire surface of the top 16 and applied with a layer thickness of 1 to 10 microns. The application of the sealing wax 18 on the carrier layer 14 can be made by any known and suitable method, such as by a gravure or flexographic printing or a doctor blade system.

The carrier layer 14 is made of an amorphous polyethylene terephthalate (A-PET) and / or of a glycol-modified polyethylene terephthalate (G-PET) or of a GAG-PET. Preferably, the carrier layer has a content of at least 90% by weight, in particular 95% by weight, of polyethylene terephthalate or is, apart from the additives used, in a proportion of not more than 3% by weight completely formed from polyethylene terephthalate, after use as complete as possible recycling of the carrier layer 14 used material.

The sealing wax 18 is selected from a varnish selected from the group consisting of water-based sealing waxes, solvent-based sealing waxes, solvent-free sealing waxes, biological sealing waxes and / or polymer-based sealing waxes. Preferably, the sealing varnish is made from a water-based varnish selected from the group consisting of vinyl-based, acrylic-based, polyester-based, and / or polyurethane-based varnishes.

The cover sheet twelve for closing the packaging tray 4 according to 2 a material structure with multiple layers, with a bottom 20 the cover sheet twelve through an underside layer 22 made of PE, PP, PET or a sealing wax. In any case, the material is the bottom layer 22 so selected that it with the sealing wax 18 the packaging tray 4 is sealable in a conventional heat sealing process.

Incidentally, the material structure of the cover sheet twelve preferably by OPP / PE, OPP / PP, OPET / PE, OPET / PP, OPA / PE, OPA / PP, PA / PE, PA / PP, PA / sealing wax, OPA / sealing wax, PET / sealing wax, OPP / sealing wax, OPET / PE / sealing wax, OPP / PE / sealing wax, OPA / PE / sealing wax or OPET / OPET / sealing wax.

After filling the receiving area 6 with a food product 24 such as sausage or meat products, cheese, another dairy product, a pasta, fruit, vegetables or seafood can thus by heat sealing the cover sheet twelve with the seal edge 10 a food packaging 26 according to 3 be prepared in the food product 24 hermetically sealed is recorded.

The heat sealing is produced at the edge of the seal 10 an area with a hatch seal shown hatched 28 , This can be designed such that it is made peelable depending on the application, to the cover sheet twelve in a simple way by hand from the packaging tray 4 to deduct. Alternatively, the heat seal compound can form a permanently strong connection to a stable and permanently airtight packaging of the food product received 24 to ensure. Furthermore, the heat seal compound 26 serve for producing a reconnectable connection area, wherein in addition adhesives are provided, which are a repeated or multiple adhesion of the cover sheet twelve on the edge of the seal 10 for periodically closing the food packaging 26 enable.

It should be noted that all the above-described elements and features of the various embodiments of the subject invention are interchangeable or combinable, if one Replacement or a combination thereof for technical reasons is not excluded.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2016/144308 A1 [0004]

Claims (18)

Film (2) for producing a packaging tray (4) with a plastically deformable carrier layer (14) containing amorphous and / or glycol-modified polyethylene terephthalate, characterized in that on a top side (16) of the deformable carrier layer (14) comprises a lacquer layer a sealing wax (18) is provided. Slide after Claim 1 , characterized in that the sealing lacquer (18) over the entire upper side (16) of the carrier layer (14) is applied over the entire area. Slide after Claim 1 or 2 , characterized in that the sealing lacquer (18) is selected from a varnish selected from the group consisting of water-based sealing lacquers, solvent-based sealing lacquers, solvent-free sealing lacquers, biological sealing lacquers and / or polymer-based sealing lacquers. Slide after Claim 3 characterized in that the sealing lacquer (18) is made from a water-based sealing lacquer selected from the group consisting of vinyl-based, acrylic-based, polyester-based and / or polyurethane-based lacquers. Foil after one of the Claims 1 to 4 , characterized in that the carrier layer (14) has a content of polyethylene terephthalate of at least 90 wt .-%, in particular of at least 95 wt .-%. Slide after Claim 5 , characterized in that the carrier layer (14) is completely made of polyethylene terephthalate except for additives with a proportion of at most 3 wt .-%. Foil after one of the Claims 1 to 6 , characterized in that the sealing lacquer (18) has a layer thickness of 1 to 10 microns. Packing tray made of a film according to one of Claims 1 to 7 is manufactured, characterized in that a receiving area (6) for a product by plastic deformation of the film (2) is made. After packaging Claim 8 , characterized in that the receiving area (6) by a deep-drawn portion of the film (2) is formed. After packaging Claim 8 or 9 , characterized in that a peripheral sealing edge (10) is formed, which is circumferentially connectable by means of heat sealing with a relative to the sealing wax (18) sealable material or paint. Packaging with a packaging tray according to one of Claims 8 to 10 and a product accommodated therein, characterized in that at the sealing edge (10) a cover film (12) by means of a heat seal compound (28) is mounted. Packaging after Claim 11 , characterized in that the heat-sealing connection (28) is peelable. Packaging after Claim 11 , characterized in that the heat-sealing connection (28) is designed as a permanently fixed connection. Packaging after Claim 11 , characterized in that the heat-sealing connection (28) is formed at least as part of a resealable connection. Packaging according to one of Claims 11 to 14 characterized in that the heat sealing compound (28) is made between the sealing lacquer (18) of the packaging tray (4) and a layer (22) on a lower surface (20) of the cover sheet (12) made of a material of the group consisting of PE , PP, PET and sealing wax is selected. Packaging after Claim 15 , characterized in that the cover film (12) has a material structure from the group consisting of OPP / PE, OPP / PP, OPET / PE, OPET / PP, OPA / PE, OPA / PP, PA / PE, PA / PP, PA / Sealing wax, OPA / sealing wax, PET / sealing wax, OPP / sealing wax, OPET / PE / sealing wax, OPP / PE / sealing wax, OPA / PE / sealing wax and OPET / OPET / sealing wax. Packaging according to one of Claims 11 to 16 , characterized in that the packaging is designed as food packaging with a food product (24) received therein. Food packaging after Claim 17 , characterized in that the ingested food product (24) is constituted by sausage or meat products, cheese or dairy products, pasta, fruits, vegetables or seafood.

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