EP3619123A1

EP3619123A1 - Packaging system comprising a fiber molding

Info

Publication number: EP3619123A1
Application number: EP18722501.6A
Authority: EP
Inventors: Klaus D. Ende; Hans-Günter DONGES
Original assignee: GEA Food Solutions Germany GmbH
Current assignee: GEA Food Solutions Germany GmbH
Priority date: 2017-05-03
Filing date: 2018-05-03
Publication date: 2020-03-11
Anticipated expiration: 2038-05-03
Also published as: EP3619123B1; WO2018202805A1

Abstract

The invention relates to a packaging system consisting of a packaging container and a separate packaging element for closing the packaging container, wherein the packaging container has a fiber molding as an outer molded structure and a molded single- or multilayer plastic film as a molded insert. The inner face of each lateral wall of the fiber molding is bonded to the insert solely in the upper sub-region of the lateral wall in each case, preferably on the upper edge of each lateral wall or on a peripheral flange optionally provided there. The insert together with the respective remaining regions of the inner face of each lateral wall extending to the base form a contact surface which has substantially the same shape but which is loose, and the fiber molding has at least one gas-venting opening, preferably multiple gas-venting openings, arranged in regular sections at least in the base region.

Description

Packaging system comprising a fiber molding

The present invention relates to a packaging system comprising a packaging container and a separate packaging element for closing the packaging container, in which the packaging container has as an outer, shaped structure a fiber molded part and as a shaped insert a molded single or multilayer plastic film, characterized in that the inside of each Side wall of the fiber molded part in each case only in its upper portion, preferably on the upper edge of each side wall or on any existing there, circumferential flange is integrally connected to the insert, the insert with the remaining areas of the inside of each side wall to the bottom in the Essentially the same shape, but loose contact surface forms and the fiber molding at least in the bottom region has at least one, preferably a plurality of arranged in regular sections degassing.

The provision of packaging systems which are particularly suitable for the packaging of food, in particular of fresh or cooked meat, poultry or fish, meat products such as ham or sausage or non-food products presents a particular challenge. The packaging systems need not just one provide hygienic protection of the product during transport and storage, but also allow for a customer-friendly presentation of the products so that, for example, the product can be inspected by the customer.

In order to obtain the best possible product quality, such as freshness and color, and to extend the shelf life, the products in the packaging systems, preferably consisting of a trough and a lid, are preferably packaged under a protective gas atmosphere in order to minimize the oxygen content in the packaging.

For this it was necessary, among other things, to develop suitably adapted packaging systems which function trouble-free at the required high packaging speeds. The known packaging systems used for this purpose, in particular in the field of the food industry, preferably comprise a recess made of plastic, which is usually not produced from renewable raw materials. Further disadvantages may also be high carbon dioxide emissions and high water consumption in the production and high costs for disposal. The LCA of the packaging system according to the invention is thus improved in particular compared to conventional systems based on plastic trays. This also applies to packaging systems in which the packaging container consists of a cardboard laminated with a plastic film over its entire surface, whose laminated surface faces the filling material. In addition, there may be problems in the use of such packaging containers on the known packaging systems, in particular in the closure of the packaging system, which may require an individual adaptation of the respective system parts. Furthermore, packaging made of corresponding composite materials is much more expensive to dispose of.

It was therefore an object of the present invention to provide a packaging system which does not have the stated disadvantages of the packaging systems of the prior art. In addition, the packaging system should as far as possible be based on renewable raw materials, which are preferably at least recyclable, and can be made largely trouble-free without further adaptation to the usual packaging equipment.

According to the invention, this object is achieved by providing a packaging system comprising a packaging container and a separate packaging element for closing the packaging container, in which the packaging container has as outer, shaped structure a fiber molded part and as shaped insert a correspondingly shaped single or multilayer plastic film, characterized in that the inside of each side wall of the fiber molded part in each case only in its upper portion, preferably on the upper edge of each side wall or on a possibly existing there, circumferential flange, is materially connected to the insert, the insert with the respective remaining areas of the inside of each side wall to the bottom forms a substantially conformal but loose contact surface and the fiber molding at least in the bottom region has at least one, preferably more, arranged in regular sections degassing.

The packaging container of the packaging system according to the invention has, as an outer, shaped structure, a fiber molded part.

Fiber molded parts are characterized by a high stability despite low weight. In particular, bio-based materials which can easily be recycled or composted after use come into consideration for producing the fiber molding according to the invention. For example, the basis for the fiber moldings are substantially crushed cellulosic materials, preferably cellulosic fibers.

In a preferred embodiment, the molded part according to the invention consists of fibers of recycled paper, fresh fibers (pulp), fibers of grasses, in particular bamboo, reeds, miscanthus, maize etc. or mixtures at least two or more of these materials. Corresponding shaped fiber parts are known to the person skilled in the art, for example in the form of egg cartons for the packaging of raw eggs.

More preferably, the fiber molding is a molded fiber part of bio-based materials that are easy to recycle or compost after use, in particular fibers from recycled paper, fresh fibers (pulp), fibers from grasses, especially bamboo, reeds, miscanthus, corn etc. or Mixtures of at least two or more of these materials.

Therefore, the packaging system according to the invention consists at least partially of renewable resources, whereby less oil reserves are consumed. Thus, the plastic content of a packaging container according to the invention can be reduced compared to packaging containers made of conventional plastics by up to 70 percent. In addition, the fiber molding and the respective liner can be easily separated from each other, which facilitates disposal and recycling and produces less environmental problems. This is not possible even with the use of cardboard laminated with plastic films. Further, the fibrous moldings based on renewable raw materials can be recycled to the external structure of the packaging containers of the invention.

The packaging container according to the invention comprises, as an outer, shaped structure, a fiber molded part which can have any container shape, preferably a trough-shaped configuration. The opening of the fiber molding may be polygonal, preferably triangular, rectangular, square or round. The fiber molding may be divided by partitions into at least two compartments. The side walls of the fiber molding can straight or preferably more or less conically tapered to the ground, whereby the packaging container according to the invention is better stackable.

The shaped insert essentially corresponds to the shape of the fiber molding and is therefore preferably also trough-shaped. If the fiber molding has compartments, the molded insert has corresponding compartments.

Preferably, the fiber molding has a height of 1, 5 cm to 10 cm, more preferably 2 cm to 8 cm. The width and length of a rectangular shaped fiber part may preferably be 3 cm to 30 cm, more preferably 10 cm to 20 cm. The volume of the fiber molding is preferably 20 to 1500 cm ³ , more preferably 100 to 1000 cm ³ , particularly preferably 500 to 800 cm ³ .

The fibrous molding used as the outer structure of the packaging container according to the invention preferably has at the upper edge of the side walls a circumferential flange as part of the fiber molding. Such a flange can be carried out in various ways, for example as a single or double fold.

The fiber molding may further comprise one or more ribs which increase the stability, in particular the rigidity, of the fiber molding and the packaging system based thereon.

Furthermore, the fiber molding may include one or more elements that facilitate unstacking of two or more fiber mold parts, thereby facilitating handling on appropriate packaging and filling machines.

Fiber moldings can preferably be produced by the so-called fiber casting process. For this purpose, carefully prepared paper fibers of e.g. Corrugated cardboard residues, newspapers, cardboard waste and / or paper, virgin fibers (pulp), fibers of grasses, in particular bamboo, reed, miscanthus, corn etc. or mixtures of at least two or more of these materials, in the so-called pulper with the aid of water to a pulp processed, depending on the materials, eg the recycled cellulose waste cellulose fibers of different quality including wood pulp and possibly fresh cellulose fibers into a suspension, the so-called porridge processed. The suspension is pumped onto screens, from which the liquid is sucked off by vacuum and the fiber mixture is retained on the sieves. The remaining fibers gradually take on the shape of the screen, so that with the help of the contour of the sieve arbitrarily shaped components can be produced. Accordingly, the desired shape of the fiber molding is produced as the outer structure of the packaging container according to the invention. According to the method, the wet fiber moldings are then dried on a drying line preferably with heated air to the desired moisture content of the moldings, usually 5%. If the fiber moldings then do not yet meet the necessary technical requirements, they can be further solidified in a press under the action of heat and thus experience an increase in stability. It goes without saying that such fiber moldings after their use, such as e.g. as the outer structure of a packaging container according to the invention, can be easily freed from the deposit and recycled again.

The molded fiber parts can thereby be obtained in a simple manner in different grammages (material thicknesses) as well as in different surface finishes (eg smoothing). The fibrous molding of the packaging container according to the invention may also be printed in order to convey, if necessary, product and consumer information or to serve for decoration. A pressure may be applied to the outside of the fiber molding and / or on the sidewalls and / or on the floor. In another embodiment, the molding is made of cardboard or corrugated board, which is brought into the desired shape using heat, moisture and the action of mechanical energy.

The inventive design of the outer, shaped structure of the packaging container as a shaped fiber part, in particular as a molded part allows the formation of a stable edge or flange. This makes it possible to use the packaging container according to the invention on already existing packaging machines and filling devices, which so far could only receive and process corresponding plastic packaging. The extremely flexible design of the fiber molding, in particular the molded part, allows in a simple manner, the production of standardized sizes and shapes, in particular rounded corners of the packaging, as they are usually used on existing equipment. Thus, the existing packaging machines and filling devices can be operated without complicated conversion processes.

The packaging system according to the invention based on molded fiber parts, in particular molded fiber parts, makes it possible to produce lightweight packaging with high stability, in particular rigidity and good stacking and EntStapelfähigkeit. By introducing ribbing in the fiber molding, the rigidity can be further increased while reducing the total weight.

The production of the packaging system based on molded fiber parts thus makes it possible, with a significantly improved eco-balance compared to corresponding packaging systems based on plastic, to obtain their advantages.

The insert of the packaging container according to the invention is preferably made of a single-layer or multi-layer, preferably heat-sealable plastic film of thermoplastic polymers.

Preferably, the insert is made of a multilayer plastic film comprising the following layer sequence:

(a) a filler-oriented, preferably heat-sealable layer (a) composed of at least one thermoplastic olefin homo- or copolymers, cyclo-olefin copolymers or mixtures thereof,

(b) a primer layer (b),

(c) optionally a layer (c) composed of at least one homo- and / or

copolyamide

(d) at least one barrier layer (d)

(c) optionally a further layer (c) composed of at least one homo- and / or copolyamide, another adhesion promoter layer (b),

optionally a layer (f) composed of at least one thermoplastic olefin homo- or copolymers, a cyclo-olefin copolymer or mixtures thereof or of at least one homo- or copolyamide or mixtures thereof,

optionally a further adhesion promoter layer (b), and

a directed to the fiber molding, preferably heat-sealable

Outer layer (s) constructed of at least one thermoplastic olefin homo- or copolymers, cyclo-olefin copolymers or mixtures thereof.

Preferably, the multilayer plastic film used in addition to the layer sequence described above, in particular (a) to (e), a further layer sequence comprising

(f) optionally a further layer (f) composed of at least one thermoplastic olefin homo- or copolymer, a cyclo-olefin copolymer or mixtures thereof or of at least one homo- or copolyamide or mixtures thereof,

(b) a further adhesion promoter layer (b),

(c) optionally a further layer (c) composed of at least one homo- and / or copolyamide,

(d) at least one barrier layer (d)

(b) if appropriate, have a further adhesion promoter layer (b) which directly adjoins the optionally present layer (f) with the optionally present layer (f) and the layer (e) remains as the outer layer.

According to the invention, the plastic film which is used as insert is stretched in the longitudinal and / or transverse direction in a drawing ratio of at least 1: 1, 5, preferably at least 1: 2, particularly preferably 1: 2 to 1: 4, since such a multilayer plastic film characterized by a particularly high puncture resistance.

Despite such a biaxial orientation, the biaxially oriented, multilayer plastic film only has a shrinkage of at most 5%, preferably of <3%, since it is fixed after stretching.

The insert film preferably has a thickness of from 30 to 400 μm, more preferably from 50 to 350 μm, even more preferably from 70 to 300 μm, most preferably from 80 to 250 μm and in particular from 90 to 220 μm or from 100 to 200 μm. As already stated, the multilayer plastic film used as insert can preferably have more than 2, more preferably 5 or more layers. Also particularly preferred as a liner is a plastic film having 5 to 1 1 layers, most preferably 5 to 10 layers.

Preferably, the insert used according to the invention is not inflatable, does not consist of segments and is not composed of several plastic webs. Preferably, the insert consists only of a, preferably thermoformed by thermoforming plastic sheet.

Particularly preferably, the insert is based on a multilayer plastic film, which is composed essentially of thermoplastic polymers.

The insert of the packaging tray according to the invention preferably consists of a multilayer plastic film comprising a transparent film composite with preferably at least one optionally multi-layer heat seal layer based on at least one thermoplastic polymer, at least one transparent layer of a thermoplastic polymer having a specific functionality and optionally from necessary adhesion promoter layers thermoplastic polymer.

As a layer having a specific functionality, the transparent film composite or the multilayer plastic film serving as insert for the packaging container according to the invention may have at least one preferably transparent barrier layer (c), preferably a barrier layer against gases, such as oxygen or water vapor, against migration of low molecular weight Shares and / or against taste or odor impairment or moisture, which is optionally connected in each case via a primer layer with the adjacent layers.

Preferably, the plastic film used as the insert of the packaging container according to the invention has an oxygen permeability according to DIN 53380-3 of less than 10.00 cm ³ / (m ² -d-bar) at 23 ° C. and 50% r. F. on. The oxygen permeability of the insert is preferably at most 8 cm ³ / (m ² -d-bar), preferably at most 7 or 6 cm ³ / (m ² -d-bar), more preferably at most 5, 4 or 3 cm ³ / (m ² -d-bar), more preferably at most 2, 1 or 0.5 cm ³ / (m ² -d-bar), most preferably at most 0.4, 0.3 or 0.2 cm ³ / (m ² -d -bar) and in particular at most 0.1, 0.09 or 0.08 cm ³ / (m ² -d-bar) (each at 23 ° C and 50% RH).

According to the invention, the values of the water vapor permeability of the plastic film used as the insert of the packaging container according to the invention preferably correspond at most to those mentioned above Oxygen permeability values, wherein the water vapor permeability according to DIN ISO 53 122 is determined.

Any plastic film, in particular known from the field of food technology, can be used with the above-listed layer sequences as a plastic film used as a liner.

For a liner, it is particularly preferable to use a multilayer plastic film comprising at least the polymer layers (a) to (e) and optionally (f). The polyolefin layers (a) and (e) preferably each form the outer layer of the insert. Particularly preferably, both outer layers of the plastic film are heat-sealable.

The polyolefin layers (a), (e) and optionally (f) of the multilayer film according to the invention are based, identically or differently, on a thermoplastic polyolefin, olefin copolymers or mixtures thereof.

Polyolefins and olefin copolymers in the context of the present invention are preferably selected from the group comprising polyethylenes (PE) - in particular low density polyethylenes between 0.86 and 0.93 g / cm ³ (LDPE), linear low density polyethylenes between 0.86 and 0.94 g / cm ³ (LLDPE) containing, in addition to ethylene as the comonomer, one or more α-olefins having more than 3 carbon atoms, high density polyethylenes between 0.94 and 0.97 g / cm ³ (HDPE) or ethylene Copolymers with an α-olefin having 4 or more carbon atoms (mPE), polypropylenes (PP), polyisobutylenes (PI), polybutylene (PB), ethylene-acrylic acid copolymers (EAA), ethylene-methacrylic acid copolymers (EMAA), ethylene Vinyl acetate copolymers having preferably 60-99 mol% of ethylene (EVA), ethylene-propylene copolymers with preferably 1-10 mol% of ethylene (EPCo) and olefin-based copolymers whose molecules are crosslinked via ionic bonds and mixtures from in each case at least two of the stated type of polymer s.

The plastic film used as a liner of the packaging container according to the invention preferably has, as already mentioned, at least one barrier layer (d). The skilled person is familiar with suitable polymers with which the desired barrier effect, in particular gas or aroma barrier, can be achieved.

Suitable polymers are ethylene-vinyl alcohol copolymers (EVOH), polyvinylidene chloride (PVDC) and vinylidene chloride copolymers, preferably with a proportion of vinylidene chloride of 80% or more, optionally also as a blend with other polymers, such as ethylene / vinyl acetate copolymers ( EVA). If the plastic film comprises several barrier layers (d), the barrier layers are based (d) preferably each, same or different, on ethylene-vinyl alcohol copolymers.

In order to protect the barrier layer (d), if necessary, against the effects of moisture, it may in each case be provided with an intermediate layer (c). These intermediate layers (c) protect the barrier layer (d), if necessary, against damage during thermoforming.

These intermediate layers (c) are preferably each based, identically or differently, on a polyamide, copolyamide or mixtures thereof. Polyamides (PA) and copolyamides (CoPA) for the purposes of the present invention are preferably aliphatic or (partially) aromatic. Preference is given to aliphatic polyamides. Preferably, the polyamides or copolyamides have a melting point in the range of 160 to 240 ° C, more preferably 170 to 220 ° C. Preferably, at least one polyamide or copolyamide is selected from the group consisting of PA 4, PA 6, PA 7, PA 8, PA 9, PA 10, PA 1 1, PA 12, PA 4,2, PA 6,6, PA 6 , 8, PA 6.9, PA 6.10, PA 6.12, PA 7.7, PA 8.8, PA 9.9, PA 10.9, PA 12.12, PA 6 / 6.6, PA 6,6 / 6, PA 6T, and PA 61. PA 6 is particularly preferred. A detailed description of polyamides and copolyamides can be found in Kunststoff-Handbuch Volume VI, Polyamides, Carl Hanser Verlag Munich, 1966; and Melvin I. Kohan, Nylon Plastics Handbook, Carl Hanser Verlag Munich, 1995, the contents of which are fully incorporated by reference.

Certain PA or CoPA can also be used as an oil or fat barrier and are known to those skilled in the art.

The multilayer plastic film used according to the invention can preferably also have one or more adhesion promoter layers (b). Suitable adhesion promoter polymers are known to the person skilled in the art.

The adhesion promoter layers (b) are preferably based, identically or differently, on a mixture of preferably modified polyolefins and / or olefin copolymers, preferably selected from the group consisting of PE and PP modified with carboxyl groups and / or cyclic anhydride groups, in particular polyethylenes modified with maleic anhydride groups, Polypropylene and ethylene-vinyl acetate copolymers. Preferred are maleic anhydride modified PE, COOH modified PE, acid modified ethylene / vinyl acetate, acid modified ethylene / (meth) acrylate copolymers or anhydride modified ethylene (meth) acrylate copolymers, anhydride modified ethylene vinyl acetate copolymers or a polymer blend containing at least two of the aforementioned polymers. Maleic anhydride modified polymers or copolymers are particularly preferred. The multilayer plastic film used as insert can have, in particular, up to 9, 10, or 11 layers, for example 5, 6, 7, 8, 9, 10 or 11 layers, the two outer, sealable layers preferably being based on PE ,

In special cases, the multilayer plastic film used as a liner can also comprise a paper layer as an outer layer, the bond between the multilayer plastic film and the paper layer being provided via a laminating layer. The person skilled in laminating layers and the materials suitable for it are known. The otherwise preferably transparent plastic film preferably has a paper layer which is directed as an insert against the filling material and preferably has a basis weight of 20 g / m ² - 100 g / m ² .

Particularly preferred as a liner is a multilayer plastic film which is heat-sealable, highly transparent and suitable for food, which has at most a shrinkback of <5% and also a barrier to gases, such as oxygen and / or water vapor, against moisture, against migration of low molecular weight fractions and / or against taste or odor impairment and / or against fats and oils.

The insert according to the invention from the described plastic films is adapted by deep drawing exactly to the shape of the fiber molded part, but only, as already stated, in the upper part of the inner surface of each side, preferably on the corresponding upper edge, particularly preferably mounted on the peripheral flange. The insert preferably consists of a compact plastic film without passages, such as perforations.

After filling the packaging container according to the invention with filling material, it is closed with a packaging element for closing the container (the closure element), preferably a lid. This closure element, preferably the lid, of the packaging system according to the invention is preferably based on a heat-sealable, single-layer or multilayer plastic film. If the closure element, preferably the lid, is constructed from a multilayer plastic film, it can also have a pressure-sensitive pressure-sensitive adhesive layer, at least in the region of the sealed seam, as a reclosable device.

In a preferred embodiment, the plastic film used as closure element is multi-layered, wherein at least one layer is based on a polyester, copolyester or mixtures thereof. The multilayer plastic film of this element preferably comprises the layers: a sealing layer directed towards the filling material, preferably a heat-sealing layer (g) composed of at least one thermoplastic olefin homo- or copolymers, cyclo-olefin copolymers or mixtures thereof, optionally a bonding agent layer (b),

optionally a layer (c) composed of at least one homo- and / or copolyamide,

optionally at least one inner barrier layer (d)

optionally a further layer (c) composed of at least one homo- and / or copolyamide,

optionally a further adhesion promoter layer (b), and

a layer (h) composed of a polyester, copolyester or one of their mixtures, preferably as outer layer.

According to the invention, the plastic film used as the closure element is stretched in the longitudinal and / or transverse direction in a drawing ratio of at least 1: 1.5, preferably at least 1: 2, more preferably 1: 2 to 1: 4, resulting in the multilayered plastic film characterized by a particularly high puncture resistance.

The plastic film used as a cover element preferably has a thickness between 20 and 350 μm, more preferably between 30 and 300 μm, even more preferably between 35 and 250 μm, most preferably between 40 and 200 μm and in particular 45 to 150 μm or 50 to 120 μm on.

Particularly preferably, the multilayer plastic film used as sealing element, which is sealable, highly transparent, possibly reclosable and suitable for food, virtually no shrinkage, in particular at most a shrinkback of <5%, preferably a barrier to gases, such as oxygen or water vapor against Moisture, against migration of low molecular weight fractions, against taste or odor impairment and / or against fats and oils.

Preferably, the plastic film used as a closure element has an oxygen permeability according to DIN 53380-3 of less than 10.00 cm ³ / (m ² -d-bar) at 23 ° C and 50% RH. The oxygen permeability is preferably at most 8 cm ³ / (m ² -d-bar), preferably at most 7 or 6 cm ³ / (m ² -d-bar), more preferably at most 5, 4 or 3 cm ³ / (m ² -d more preferably at most 2, 1 or 0.5 cm ³ / (m ² -d-bar), most preferably at most 0.4, 0.3 or 0.2 cm ³ / (m ² -d-bar and in particular at most 0.1, 0.09 or 0.08 cm ³ / (m ² -d-bar) (each at 23 ° C and 50% RH). The multilayer plastic film used as a closure element also has at most a water vapor permeability which corresponds to the above-mentioned values of the oxygen permeability, wherein the water vapor permeability according to DIN ISO 53 122 is determined.

The packaging system according to the invention preferably comprises not only the packaging container according to the invention comprising the fiber molded part and the insert described above, but also a preferably transparent closure element, preferably a lid, of a preferably multilayered, optionally resealable plastic film with optionally the said barrier properties for closing the packaging container. Suitable barrier layers have already been disclosed above in connection with description of the multilayer plastic film used as a liner according to the invention.

Particularly preferably, the closure element consists of an at least two-layer plastic film. The material of this plastic film and the multilayer plastic film used as a liner may be the same or different. Preferably, any plastic film known to a person skilled in the art, in particular from the field of food technology, which preferably has a polyester layer, can be used for the lid. The plastic film of the closure element may optionally be printed.

Particularly preferably, the plastic film of the closure element comprises a heat-sealable layer (g) which is preferably based on the same polymer as the heat-sealable layers (a) or (e) of the plastic film from which the insert is made or at least in the same type of polymer. Suitable polymers for producing the layers (b), (c), (d) and (f) optionally present in the plastic film of the closure element have already been disclosed above in connection with the description of the plastic film used as a liner.

The preferably present layer (h) of the cover plastic film is based on at least one polyester or at least one copolyester, which is preferably selected from the group comprising polyethylene terephthalate (PET), in particular c-PET, a-PET, CoPET, PBT and CoPBT. If appropriate, the polyester or copolyester layer can also be oriented. By "PET" is meant polyethylene terephthalates made from ethylene glycol and terephthalic acid. Furthermore, amorphous PET (a-PET) and crystalline PET (c-PET) can be used. "CoPET" refers to copolyesters which, in addition to ethylene glycol and terephthalic acid, also contain other monomers, such as, for example, branched or aromatic diols. "CoPBT" refers to polybutylene terephthalates. Preferably, the polyester or copolyester used has an intrinsic viscosity of preferably 0.1 to 2.0 dl / g, more preferably 0.3 to 1, 5 dl / g, in particular from 0.6 to 1, 0 dl / g, wherein the method for determining the intrinsic viscosity is known in the art. A detailed description of suitable PET, PBT, polycarbonates (PC) and copolycarbonates (CoPC) is in the Kunststoffhandbuch Volume 3/1 - engineering thermoplastics: polycarbonates, polyacetals, polyesters, cellulose esters; Carl Hanser Verlag, 1992, the contents of which are incorporated by reference.

The plastic film as a closure element very particularly preferably comprises a preferably at least two-layered plastic film which has a layer based on PE or oriented PET (oPET), the heat-sealing layer made of PE facing the filling material as closure element. Possibly. is the plastic film of the closure element, preferably the lid, resealable via a pressure-sensitive adhesive layer.

The plastic film of the closure element can also comprise a paper layer, wherein the bond between the preferably multilayer plastic film and the paper layer is given via a laminating layer. The person skilled in the art is familiar with suitable materials for laminating layers. This paper layer of the closure element can have a cut-out in the form of a window for viewing. The closure element, preferably the lid, of the packaging system according to the invention may consist of a composite of a preferably multilayer plastic film and a paper web, wherein the paper web optionally has a cutout in the form of a window.

The layers of the preferably used multilayer plastic films and serving as a closure element, preferably multilayer plastic film may optionally with additives selected from the group comprising antioxidants, antiblocking agents, antifog agents, antistatic agents, antimicrobial agents, light stabilizers, UV absorbers, UV filters, Dyes, color pigments, stabilizers, preferably heat stabilizers, process stabilizers and UV and / or light stabilizers, preferably based on at least one sterically hindered amine (HALS), peel additives or process aids doped.

To produce the packaging container according to the invention, the described plastic film as a plastic film, preferably under heat and applying a vacuum or pressure exerted in the already existing fiber molding deep drawn until the plastic film substantially the same shape with the structure on the inner walls to the bottom and on the inside of the Forming fiber part forms a loose contact surface and does not shrink back, at the same time a degassing between the plastic film insert and the fiber molded part via the located at least in the bottom region of the cardboard structure degassing or degassing occurs. Alternatively, the plastic film web can also be at least partially already brought into the shape of the insert before it is deep drawn into the fiber molding until the final molding.

Preferably, the method for producing the packaging system according to the invention is carried out so that initially serving as insert plastic film web, preferably under heat, as long under vacuum and / or pressure exerted in the fiber molded part deep until the plastic film substantially with the Formed fiber form equal to the inside of the side walls up to and over the bottom of the fiber molding a loose contact surface and does not shrink back, at the same time a degassing between the insert and the fiber molding over the located at least in the bottom region of the fiber molding degassing or degassing,

the fiber molded part is materially connected, preferably by heat sealing or pressing, in the upper portion, preferably on the upper edge of the inside of each side wall circumferentially or on the existing circumferential flange with the insert

and after filling of the packaging container, if appropriate with gas exchange with the closure element, preferably a lid, from one of said plastic films with the over the entire edge or the flange of the fiber molded part circumferentially protruding part of the insert of plastic film is sealed by sealing.

The integral connection of the insert with the fiber molded part does not take place via tabs.

In order to be able to dissipate the air to be displaced into the fiber molded part during deep drawing of the insert, the fiber molded part preferably has at least one, preferably several, degassing openings arranged in regular intervals in the bottom region.

The number of vent openings preferably depends on the size of the fiber molding.

The vent openings can have any shape. The degassing openings are preferably in the form of slots, which preferably have a length of 0.5 cm to 10 cm, more preferably 1 cm to 5 cm.

These degassing openings of the fiber molded part are preferably arranged in the optionally present edges between the individual side walls and the possibly existing floor area or in the possibly existing floor. In a particularly preferred embodiment, the vent openings of the fiber molding, preferably in the form of slots, at regular intervals in the edges between the bottom and the side walls, preferably complementary to the Gasabführungsvorrichtungen, ie

Luftabführungsvorrichtungen, the respective forming tool, arranged when the fiber molding is designed in the form of a trough.

In order to bond the insert with the fiber molding in the specified range, the preferably sealable plastic film by sealing, d. H. under the action of heat and pressure, by crimping, by compression or by gluing, e.g. be bonded by gluing with a self-adhesive film portion, in particular a double-sided self-adhesive film portion. Preference is given to heat-sealing with sealing tools. In this case, the cohesive connection between the fiber molding and the insert takes place in that the insert and the fiber molding are pressed against each other in the predetermined range under heating.

Accordingly, the insert of the packaging system according to the invention is preferably based on a thermoformed plastic film, preferably thermoformed by deep drawing, which is bonded in a materially bonded manner to the molded fiber part by heat sealing or pressing only in the indicated regions, preferably in the entire circumference.

The insert preferably has a circumferential edge projecting over the entire edge of the fiber molded part as a flange, which serves for closing the packaging tray. This flange as a sealing edge is preferably perpendicular from the upper edge of the side walls.

After filling the packaging container, it can be closed by gas exchange with the closure element, preferably the lid, based on one of said plastic films by sealing with the flange.

In a particularly preferred embodiment

the fiber molding has a plurality of slot-shaped degassing openings in the bottom surface or in the edges between the bottom surface and side walls; and or

the fiber molding has a trough shape; and or

the insert is connected to the peripheral flange of the fiber molding each in an upper portion by sealing; and or

the inserts is introduced by deep drawing in the fiber molding; and / or is the insert of a plastic film with the layer structure (a), (b), (c), (d),

(c), (b), if appropriate (f), if appropriate (f), if appropriate (b), if appropriate (c), if appropriate (d), if appropriate (c), if appropriate (b) and (e); and or the insert has a thickness between 90 and 220 μηη; and or

The plastic film of the insert comprises at least one layer of PE, PA and

EVOH; and or

the closure element, preferably the lid, is made from an at least two-layered plastic film; and or

has the plastic film of the closure element, preferably the lid, a thickness of 45 to 150 μιτι; and or

the plastic film of the closure element, preferably the lid, comprises layers of OPET or PE; and or

the insert of the packaging container is connected to the closure element by heat sealing; and or

the plastic film of the closure element has a resealable

Arrangement based on a pressure-sensitive adhesive layer; and or

the packaging system according to the invention is a packaging for

Food.

The packaging system according to the invention is suitable as a packaging for goods of any kind, preferably foods, luxury foods, animal feed and medical products, in solid or liquid form. The packaging system according to the invention is particularly preferably suitable as packaging for raw or cooked foods such as meat and fish, meat products such as ham or sausage, ready meals, frozen foods, animal feeds, dry powders of all kinds, solid milk products, sweets such as chocolate products, pasta, medical products and decorative articles.

The individual constituents or materials, coatings, paints, etc. of the packaging system according to the invention are each chosen so that they correspond to the requirements for packaging the contents (for example, food suitability for food and luxury goods).

The packaging system according to the invention is preferably sterilizable, pasteurizable and / or microwaveable.

Further details and advantages of the invention will be shown below with reference to Figures 1 to 3. This shows

Figure 1 is a perspective view of an embodiment of a

Fiber molding 2a with degassing. 4

Figure 2 is a perspective view of an embodiment of a

Packaging container 2 made of a molded fiber part 2a and a liner 2b Figure 3 is a perspective view of an embodiment of a packaging system with packaging container 2 made of molded fiber part 2a and insert 2b and the separate packaging element for closing the packaging container. 2

Figure 4 is a perspective view of another embodiment of a

Fiber molding 2a

5 shows a section through the perspective view of the fiber molded part 2a according to FIG. 4.

By way of example, FIGS. 1 to 5 illustrate a two-part packaging system 1 comprising a packaging container 2 and a separate packaging element 3 for closing the packaging container 2, in which the packaging container 2 has a molded fiber structure 2a as an outer, shaped structure and a molded plastic film as a molded insert 2b. The inside of each side wall of the fiber molded part is connected in each case only in its upper portion, preferably on the upper edge of each side wall or on the peripheral flange there present to the insert cohesively. The insert 2b further forms with the respective remaining areas of the inside of each side wall to the bottom substantially conformal, but loose contact surface forms and the fiber molding 2a has at least a plurality of arranged in regular intervals degassing 4 in the bottom region.

The fiber molding may have a fold 5 for better handling on known packaging and filling machines. Further ribs 6 can be provided to increase the stability and elements 7, which facilitate unstacking.

LIST OF REFERENCE NUMBERS

1 packaging system

2 packaging containers

2a fiber molding

2b insert

3 packing element

4 degassing opening

5 fold

6 ribs

7 elements to unstack

Claims

claims:

1 . A two-part packaging system (1) comprising a packaging container (2) and a separate packaging element (3) for sealing the packaging container (2), in which the packaging container (2) has as an outer, shaped structure a fiber molded part (2a) and as a molded insert (2). 2b) has a molded single-layer or multi-layer plastic film, characterized in that the inner side of each side wall of the fiber molded part in each case only in its upper portion, preferably on the upper edge of each side wall or on a possibly existing there circumferential flange with the insert materially connected is the deposit with the remaining one

Areas of the inside of each side wall to the bottom one in the

Has substantially the same shape, but loose contact surface and the fiber molding at least in the bottom region at least one, preferably a plurality of arranged in regular sections degassing openings (4).

2. A packaging system (1) according to claim 1, characterized in that the packaging container (2) is a packaging tray of a

trough-shaped fiber molded part (2 a) as an outer structure and of a molded into a corresponding trough plastic film as insert (2 b), which is attached only on the upper edge of each side wall or on any existing there flange of the trough-shaped fiber molding.

3. A packaging system (1) according to claim 1 or 2, characterized

in that the degassing openings (4) of the fiber molding (2a) take the form of slots at regular intervals in the edges between the bottom and the side walls, preferably complementary to the

Gas discharge of the respective forming tool for the insert (2b) deformed plastic film, are arranged.

4. A packaging system (1) according to one of the preceding claims, characterized in that the insert (2b) of the packaging container (2) is based on a thermoformed plastic film in the specified areas preferably fully with the fiber molded part (2a) by heat sealing or compression is connected cohesively.

5. A packaging system (1) according to one of the preceding claims, characterized in that the fiber molded part (2a) substantially on

crushed cellulose materials, preferably cellulose fibers.

6. A packaging system (1) according to one of the preceding claims, characterized in that it is based on fibers of recycled paper, fresh fibers (pulp), fibers of grasses, especially bamboo, reed, miscanthus, or corn or mixtures of at least two or more based on these materials.

7. A packaging system (1) according to one of the preceding claims, characterized in that the fiber molded part (2a) is printed.

8. A packaging system (1) according to one of the preceding claims, characterized in that the flange of the fiber molding (2a) is designed as a single or double fold.

9. A packaging system (1) according to one of the preceding claims, characterized in that the fiber molded part (2a) has at least one, preferably a plurality of ribs for increasing the stability.

10. A packaging system (1) according to one of the preceding claims, characterized in that the fiber molded part (2a) has at least one element, preferably a recess, which destacking thereof

simplified.

1 1. A packaging system (1) according to one of the preceding claims, characterized in that the fiber molded part (2a) is a molded fiber part.

12. A packaging system (1) according to one of the preceding claims, characterized in that the insert (2b) consists of a thermoformed,

multilayer plastic film comprising a preferably transparent film composite

an optionally multi-layered heat-sealable layer based on at least one thermoplastic polymer,

at least one transparent layer of a thermoplastic polymer having a specific functionality, preferably at least one barrier layer and

optionally from necessary primer layers from a

modified thermoplastic polymer

consists.

13. A Verpackungssystenn (1) according to claim 12, characterized in that the preferably transparent film composite at least one preferably transparent barrier layer against gases, such as oxygen or water vapor, against moisture, against migration of low molecular weight fractions and / or against taste or odor impairment, which is connected in each case via a bonding agent layer with the adjacent layers.

14. A packaging system (1) according to claim 12 or 13, characterized

characterized in that the preferably transparent film composite comprises a paper layer which is directed against the medium and preferably has a basis weight of 20 g / m ² - 100 g / m ² .

15. A packaging system (1) according to one of the preceding claims, characterized in that the system next to the packaging container (2) of a fiber molded part (2a) and a liner (2b) made of a plastic film a separate, preferably transparent, on the packaging container suitable Closure element (3), preferably a lid, made of a preferably multi-layered, optionally recloseable

Contains packaging film.

16. A packaging system (1) according to one of the preceding claims, characterized in that the closure element (3) consists of a composite of an optionally multi-layered, preferably transparent

Plastic film and a paper web, wherein the paper web

optionally has a cutout in the form of a window.

17. A packaging system (1) according to one of the preceding claims, characterized in that the multilayer plastic film of the

Closure element (3) preferably a pressure-sensitive

Pressure-sensitive adhesive layer has a reclosable device.

18. A packaging system (1) according to one of the preceding claims, characterized in that the packaging system is suitable as a packaging for goods of any kind, preferably food, luxury food, animal feed and medical products, in solid or liquid form.

19. A packaging system (1) according to claim 15, characterized in that it is sterilizable as packaging, pasteurisable and / or microwaveable. A method of making a package from a

Packaging system (1) according to any one of claims 1-19, characterized in that for the production of the packaging container (2) serving as insert (2b) plastic film web preferably below

Heat supply as long under vacuum and / or pressure applied in the mechanical fiber molding (2 a) is deep drawn until the plastic film substantially the same shape on the inside of each side wall to and over the bottom of the fiber molding (2 a) a loose contact surface and does not shrink back, wherein at the same time a degassing between the insert (2b) and the fiber molded part (2a) via the at least in the bottom region of the fiber molded part located degassing opening (4) or

Degassing openings (4) takes place,

the insert (2b) with the fiber molding (2a) cohesively in the upper

Part area on the edge or on the possibly circumferential flange of the inside of each side wall with the insert (2b) is joined

and the packaging container (2) after filling optionally with gas exchange with the closure element (3), preferably a lid, based on a plastic film with or over the entire edge of the fiber molded part (2a) circumferentially protruding part of the insert made of plastic film is sealed by sealing.