Packaging with paper material

Abstract

The invention relates to a package (10) comprising at least one first piece of packaging material (13), wherein the first piece of packaging material (13) comprises a coated paper (1), the coated paper having a base paper (2) and at least three coatings (3, 4, 5) applied superimposed on the base paper (2), wherein the at least three coatings (3, 4, 5) sequentially, starting from the base paper (2), comprise a first barrier layer (3) comprising at least one hydrophobic polymer, a second barrier layer (4) comprising at least one hydrophilic polymer and a third barrier layer (5) comprising at least one hydrophobic polymer, wherein the package is hermetically closed.

Description

Technical Field

[0001] The present invention relates to a packaging for products using a coated paper material. Background Art

[0002] Packaging is usually referred to as a wrapper or (partial or complete) enclosure of an object or product, especially for protecting the object or product or for better handling thereof. Therefore, packaging material comprises the material forming such packaging or a part of the packaging.

[0003] The packaging material may be constructed, for example, based on paper, plastic and / or metal. The present invention is directed to paper-based packaging materials.

[0004] Packaging materials based on paper are known in principle. However, to date, no fiber / paper-based flexible packaging material is known which is suitable for packaging oxidation-sensitive, moist and greasy objects (especially foods) and which at the same time does not contain halogen-containing compounds or barrier layers composed of aluminum, Al2O3 and / or SiO2, which must be applied by lamination or vapor deposition outside of a paper coating machine.

[0005] Known packaging materials often contain compounds such as polyvinylidene chloride (PVDC; halogen-containing); have an increased tensile strength (which can lead to operational problems in packaging equipment); and cannot be recycled through the paper flow due to an excessively high coating content. In addition, known packaging materials have an excessively high permeability to water, water vapor, oxygen and grease and therefore lead to a short shelf life of the packaged products.

[0006] WO 2018 / 109448 A1 discloses a method for producing packaging, in which a fibrous material (e.g. paper) is provided with a gas barrier film (optionally comprising several layers). Summary of the invention

[0007] It is an object of the present invention to provide an improved package which is particularly suitable for packaging perishable foods.

[0008] This object is achieved by a package as described below, namely by a package which is airtight and at least partially comprises coated paper, the paper comprising a base paper and at least three coating layers applied thereto, wherein the at least three coating layers sequentially, starting from the base paper, comprise a first barrier layer comprising at least one hydrophobic polymer, a second barrier layer comprising at least one hydrophilic polymer and a third barrier layer comprising at least one hydrophobic polymer.

[0009] Paper coated in this way is particularly suitable as a packaging material for oxidation-sensitive, moist and greasy objects, in particular foods, and can even be used to produce packaging by means of ultrasound or heat sealing applications, if necessary. In addition, adhesion promoters between the individual layers can be omitted without disadvantages, and barrier layers based on halogen-containing compounds, aluminum, Al2O3 and / or SiO2 are definitely not present.

[0010] Furthermore, such coated papers can be produced relatively simply and with a low coating weight.

[0011] Hereinafter, the term "comprising" shall also mean "made of".

[0012] Materials that cannot mix with water are called "hydrophobic." Materials that can mix with water are called "hydrophilic." Hydrophobic polymers are also called non-polar polymers, and hydrophilic polymers are also called polar polymers.

[0013] The hydrophobicity or hydrophilicity can be defined, for example, by the logP value. n-octanol-water partition coefficient K ow The log P value is the n-octanol-water partition coefficient K (also commonly used and correct) which is a dimensionless partition coefficient known to those skilled in the art and which gives the proportional relationship between the concentrations of a chemical substance in a two-phase system consisting of n-octanol and water and is therefore a measure of the hydrophobicity or hydrophilicity of a substance. ow The decimal logarithm of . This applies:

[0014] as well as where c o Si is the concentration of the chemical in the octanol-rich phase and C w Si is the concentration of the chemical in the water-rich phase.

[0015] If the material is more soluble in lipid solvents (such as n-octanol), K ow Greater than 1, if the material is more soluble in water, then K ow Less than 1. Accordingly, logP is positive for hydrophobic materials / lipophilic materials and negative for hydrophilic materials / lipophobic materials.

[0016] Preferred embodiments of the coated paper are described below:

[0017] Coated paper, wherein the first barrier layer comprises or is made of a substance selected from the group consisting of lipophilic substances, paraffins, especially hard paraffins, waxes, especially microcrystalline waxes, waxes based on plant oils or fats, waxes based on animal oils or fats, vegetable waxes, animal waxes, low molecular weight polyolefins, polyterpenes and mixtures thereof.

[0018] Coated paper in which the passage of substances, in particular hydrophobic substances, is reduced or prevented by a second barrier layer.

[0019] Coated paper, in which the passage of substances, in particular hydrophobic substances, from or through a first barrier layer into or out of a third barrier layer is reduced or prevented.

[0020] Coated paper in which the passage of substances, in particular hydrophobic substances, from the third barrier layer into the first barrier layer or through the third barrier layer into the first barrier layer is prevented.

[0021] Coated paper, wherein the passage of substances selected from the group consisting of lipophilic substances, paraffins, especially hard paraffins, waxes, especially microcrystalline waxes, waxes based on plant oils or fats, waxes based on animal oils or fats, vegetable waxes, animal waxes, low molecular weight polyolefins, polyterpenes and mixtures thereof is reduced or prevented.

[0022] In particular, the passage of these substances can be reduced or prevented by a suitable type and amount of the at least one hydrophilic polymer of the second barrier layer.

[0023] Coated paper, wherein the third barrier layer is free of substances which, apart from unavoidable or tolerated contamination, are not allowed to come into direct contact with foodstuffs, in particular substances selected from the group consisting of lipophilic substances, paraffins, in particular hard paraffins, waxes, in particular microcrystalline waxes, waxes based on plant oils or fats, waxes based on animal oils or fats, vegetable waxes, animal waxes, low molecular weight polyolefins, polyterpenes and mixtures thereof.

[0024] Hard paraffins, in particular hard paraffins of natural origin or synthetic origin, microcrystalline waxes, low molecular weight polypropylenes, natural waxes, low molecular weight polyolefins, polyterpenes and mixtures thereof are defined in particular in BfR No. 25 of June 1, 2019 (Federal Institute for Risk Assessment of the German Federal Ministry of Food and Agriculture) or in a corresponding version.

[0025] This prevents: a) the passage of these substances into the third barrier layer and / or the passage from the third barrier layer to the outside, especially into the contact material, especially contact with greasy foods; and b) the barrier properties of the layers, especially the first barrier layer, the second barrier layer and / or the third barrier layer, are maintained by reducing or preventing the passage of these substances, otherwise the barrier properties will be changed or completely lost due to the passage of these substances; c) the passage of substances from the contact material into the first barrier layer and / or the resulting changes to the first barrier layer.

[0026] The base paper used in the coated paper is in principle not restricted.The term "base paper" covers any paper material including thick paper or board.

[0027] Preferably, the base paper has a unit area weight of 20 to 120 g / m 2 , preferably 40 to 100 g / m 2 .

[0028] Furthermore, it is preferred that the paper has a long fiber content of 10 to 80%, preferably a long fiber content of 20 to 50%, and a short fiber content of 20 to 90% by weight, preferably a short fiber content of 50 to 80% by weight.

[0029] Long fibers are understood to be fibers having a fiber length of 2.6 to 4.4 mm, and short fibers are understood to be fibers having a fiber length of 0.7 to 2.2 mm.

[0030] Furthermore, 0 to 20%, preferably 0 to 5%, of fillers, for example GCC known under the trade name Hydrocarb 60 or Hydroplex 60, PCC known under the trade name PreCarb 105, natural kaolin and / or talc, and also customary auxiliaries such as retention aids and / or sizes, may be contained.

[0031] The advantages of this base paper lie on the one hand in its great flexibility and on the other hand in its good processability on existing packaging equipment, while maintaining high machine availability and achieving the necessary puncture resistance.

[0032] Due to the barrier effect of the coated paper against the passage of oxygen, the packaging according to the invention provides particular advantages in the packaging of products which are particularly sensitive to oxidation or are packaged in an atmosphere with a particularly high oxygen content in order to extend their shelf life. The common point of both cases is that the packaging can maintain a high gradient of oxygen concentration relative to the environment of the packaging for a relatively long time. For this reason, the packaging is particularly well suited if the oxygen content of the atmosphere in the inner cavity of the packaging is very low, for example below 3% or even a maximum of 2%, or, on the contrary, if the oxygen content of the atmosphere in the inner cavity of the packaging is very high, for example above 60% or even 70% and more. Both ranges differ greatly from the oxygen content in the usual ambient air (typically about 20.95%).

[0033] In order to assist the barrier effect for the passage of gases, the package is preferably closed gas-tightly by means of at least one sealing seam, at which the packaging materials are fused to one another.

[0034] In a first variant, the package has only a first packaging material piece and, for example, the first packaging material piece is sealed with itself after being folded back on itself. Such packages, which can be produced, for example, on a soft bag packaging machine or a chamber vacuum packaging machine (including so-called conveyor belt vacuum packaging machines), are particularly easy to produce because they require particularly few sealing seams.

[0035] In a second variant, in addition to the first material sheet, the package also includes a second packaging material piece, wherein the two packaging material pieces are sealed to each other. The second packaging material piece can here have a plastic material, in particular a stretchable plastic material (e.g. polyurethane, PU). Alternatively, the second packaging material piece has the same coated paper as the first packaging material piece.

[0036] The packaging with the variant of the first packaging material part and the second packaging material part can be produced on a tray sealer or a stretch wrapper, for example. The first packaging material part with the coated paper can be used as a tray or as a lid for closing a tray.

[0037] Preferably, in the first packaging material piece or in the second packaging material piece (if present), the side of the base paper provided with the coating faces the inner cavity of the package. However, alternatively, it is also conceivable that the side of the base paper applied with the coating is away from the inner cavity of the package.

[0038] The first barrier layer comprises at least one hydrophobic polymer. This barrier layer preferably acts as a barrier for water vapor and thus protects the packaged product from drying out. The barrier layer also serves to protect the hydrophilic barrier from moisture, since this barrier can only fully function in a dry state.

[0039] At least one hydrophobic polymer preferably comprises a polymer based on polyacrylate and / or polyolefin. Suitable polymers include in particular polymethyl acrylate, polymethyl methacrylate, polyethyl acrylate, polyethyl methacrylate, poly(n-, iso-, tert-)butyl acrylate, poly(n-, iso-, tert-)butyl methacrylate, polycyclohexyl acrylate, polyethylhexyl acrylate and copolymers thereof, grafted polymers, and copolymers with styrene, acrylonitrile, methyl styrene or vinyl toluene, styrene-butadiene copolymers, polyvinyl acetate (partially saponified), polyesters, polyamides, polyurethanes, polyethers, polyethylene imine, and / or polyethylene amine.

[0040] In addition to the hydrophobic polymers, waxes may also be provided. Suitable waxes include compounds such as paraffin waxes or natural mixtures or pure substances of short-chain to medium-chain hydrocarbons, which are colloquially referred to as "waxes". Suitable waxes are, for example, heneicosane, docosane, tricosane, tetracosane, pentacosane, hexacosane, heptacosane, octacosane, nonacosane, triacontan, triacontan, dotriacontan, tricatriacontan, tetratriacontan, pentatriacontan, hexatriacontan, heptatriacontan, octatriacontan, nonacosane; lignite wax, natural waxes (carnauba wax, beeswax, candelilla wax), waxes produced by hydrogenation or partial hydrogenation of vegetable and animal oils or fats, and metal soaps, for example calcium stearate.

[0041] Suitable polymers and polymer / wax mixtures are known, inter alia, under the trade names CHT Coat 230, Vapor Coat 2200, Vapor Coat 1300, Bim BA 8510, Bim BA 8888, Cartaseal VWF, Cartaseal SWF, Sealcoat SL 251, Rhobarr 320, B-Coat SP1, B-Coat WB 100, B-Coat 50 / 3, Chemipearl S 300, Ultraseal W-951, Ultraseal W-952, Ukaphob HR 530, Induprint SE 2555, Wükoseal 630, Extomine BG-EM 52%, Eurika Coat 3624, Aquacer 1061 and Epotal SP 106.

[0042] The at least one hydrophobic polymer is preferably contained in the first barrier layer in an amount of 1 to 100% by weight, particularly preferably 50 to 99.5% by weight or 50 to 100% by weight, relative to the total weight of the first barrier layer.

[0043] Preferably, the first barrier layer is hydrophobic as a whole.

[0044] The first barrier layer may also contain additives such as thickeners, for example acrylate-based thickeners, surfactants, for example sulfosuccinates, extensional rheological aids, for example polyacrylamide, carboxymethylcellulose, polyvinyl alcohol, and / or crosslinking agents, such as aldehydes and polyvalent aldehydes, zirconates, polyvalent epoxides, epichlorohydrin resins and / or hydrazides.

[0045] These additives are preferably contained in an amount of 0.1 to 1 wt % respectively, relative to the total weight of the first barrier layer.

[0046] The coating amount of the first barrier layer is preferably 1 to 20 g / m 2 And particularly preferably 5 to 10 g / m 2 This amount refers to the dried first barrier layer in the final product.

[0047] The second barrier layer comprises at least one hydrophilic polymer.This barrier layer preferably acts as a barrier for oxygen and thus protects the packaged product from oxidation.

[0048] The hydrophilic polymer preferably comprises a polymer based on polyvinyl alcohol. Suitable polymers are in particular polymers based on vinyl alcohol or copolymers composed of ethylene and vinyl alcohol.

[0049] Suitable polymers are known under the trade names Exceval AQ 4104, Exceval HR 3010, Sealcoat HS25 and MichemFlexB 1001, among others.

[0050] The at least one hydrophilic polymer is preferably contained in the second barrier layer in an amount of 1 to 100% by weight, particularly preferably 50 to 99.5% by weight or 50 to 100% by weight, relative to the total weight of the second barrier layer.

[0051] Preferably, the second barrier layer is hydrophilic as a whole.

[0052] The second barrier layer may also contain additives such as thickeners, for example acrylate-based thickeners, surfactants, for example sulfosuccinates, extensional rheological aids, for example acrylate-based extensional rheological aids, and / or crosslinking agents, such as aldehydes and polyvalent aldehydes, zirconates, polyvalent epoxides, epichlorohydrin resins and / or hydrazides.

[0053] These additives are preferably contained in an amount of 0.1 to 1% by weight, respectively, relative to the total weight of the second barrier layer.

[0054] The coating amount of the second barrier layer is preferably 1 to 20 g / m 2 And particularly preferably 1 to 10 g / m 2 This amount refers to the dried second barrier layer in the final product.

[0055] The third barrier layer comprises at least one hydrophobic polymer.This barrier layer preferably acts as a barrier for water vapor and thus protects the packaged product from drying out.

[0056] The at least one hydrophobic polymer comprised in the third barrier layer is preferably a thermoplastic polymer, so that this layer thereby becomes sealable.

[0057] “Sealing” is preferably understood to mean the joining of two layers of coated paper by means of a local action of heat (in the case of “heat sealing”) or by means of ultrasound.

[0058] At least one hydrophobic polymer preferably comprises a polymer based on polyacrylate and / or polyolefin. Suitable polymers include in particular polymethyl acrylate, polymethyl methacrylate, polyethyl acrylate, polyethyl methacrylate, poly(n-, iso-, tert-)butyl acrylate, poly(n-, iso-, tert-)butyl methacrylate, polycyclohexyl acrylate, polyethylhexyl acrylate and copolymers thereof, grafted polymers, and copolymers with styrene, acrylonitrile, methyl styrene or vinyl toluene, styrene-butadiene copolymers, polyvinyl acetate (partially saponified), polyesters, polyamides, polyurethanes, polyethers, polyethylene imine, and / or polyethylene amine.

[0059] In addition to the hydrophobic polymers, waxes may also be provided. Suitable waxes include compounds such as paraffin waxes or natural mixtures or pure substances of short-chain to medium-chain hydrocarbons, which are colloquially referred to as "waxes". Suitable waxes are, for example, heneicosane, docosane, tricosane, tetracosane, pentacosane, hexacosane, heptacosane, octacosane, nonacosane, triacontan, triacontan, dotriacontan, tricatriacontan, tetratriacontan, pentatriacontan, hexatriacontan, heptatriacontan, octatriacontan, nonacosane; lignite wax, natural waxes (carnauba wax, beeswax, candelilla wax), waxes produced by hydrogenation or partial hydrogenation of vegetable and animal oils or fats, and metal soaps, for example calcium stearate.

[0060] Suitable polymers and polymer / wax mixtures are known, inter alia, under the trade names Vapor Coat 1300, Bim BA 8888, Cartaseal SWF, Sealcoat SL 251, Rhobarr 320, B-Coat SP1, B-Coat WB 100, B-Coat 50 / 3, Chemipearl S 300, Ultraseal W-951, Ultraseal W-952, Wükoseal 630, Eurika Coat 3624 and Epotal SP 106.

[0061] The at least one hydrophobic polymer is preferably contained in the third barrier layer in an amount of 1 to 100% by weight, particularly preferably 50 to 100% by weight or 50 to 99.5% by weight, relative to the total weight of the third barrier layer.

[0062] Preferably, the third barrier layer is hydrophobic as a whole.

[0063] The third barrier layer may also contain additives such as thickeners, for example acrylate-based thickeners, surfactants, for example sulfosuccinates, extensional rheological additives, for example acrylate-based extensional rheological additives, waxes, for example fatty acid or fatty acid amide-based waxes, additives for reducing wear sensitivity and increasing slip, such as layered silicates, in particular magnesium silicate hydrate or aluminosilicates, and / or crosslinkers, such as aldehydes and polyvalent aldehydes, zirconates, polyvalent epoxides, epichlorohydrin resins and / or hydrazides.

[0064] These additives are preferably contained in an amount of 0 to 50% by weight, preferably 0 to 30% by weight, respectively, relative to the total weight of the third barrier layer.

[0065] The coating amount of the third barrier layer is preferably 1 to 20 g / m 2 And particularly preferably 5 to 10 g / m 2 This amount refers to the dried third barrier layer in the final product.

[0066] In a special embodiment, if the packaged product contains fats and oils in addition to water, the third barrier layer should not contain low molecular weight, fat-soluble components, except for the minimum amount that allows contact with fat-containing foods. As a result, waxes for improving the water vapor barrier are largely excluded, and polymer systems must be used, which even in the absence of waxes constitute an acceptable water vapor barrier and are ideally heat-sealable. For example, copolymers of non-polar monomers (such as ethylene) with acrylic acid and other ethylenically unsaturated carboxylic acids are suitable for this, which in addition to the water vapor barrier also have a certain fat barrier. Known products are, for example, Cartaseal SWF, Wükoseal 630 and Sealcoat SL 251. The first barrier layer can still contain wax, because the second barrier layer with its functions for oxygen barrier, grease barrier and mineral oil barrier also forms an excellent barrier to waxes, which generally have strong non-polar characteristics.

[0067] In a preferred embodiment of the coated paper according to the present invention, a pre-coating layer comprising at least an inorganic pigment and a polymer binder is provided between the base paper and the first barrier layer.

[0068] Inorganic pigments include especially silicates, preferably phyllosilicates and very particularly preferably kaolin.

[0069] The polymer binder preferably comprises a polyacrylate-based polymer binder.

[0070] Suitable polymer binders are in particular acrylate-based or styrene / butadiene-based binders. In principle, all polymers which can be used as binders for pigment coatings in the paper industry are suitable. Starch-based binders are also possible.

[0071] Suitable polymer binders are known, inter alia, under the trade names Acronal 305S, Ligos K 4079, Acronal S728, XZ94346.01, XZ94346.00.

[0072] The pre-coating layer preferably comprises 1 to 70% by weight, preferably 5 to 50% by weight, of polymer binder. The amounts refer to the dried pre-coating layer in the final product.

[0073] The pre-coating layer preferably also comprises 50 to 95% by weight, preferably 80 to 90% by weight, of inorganic pigments. The amounts refer to the dried pre-coating layer in the final product.

[0074] Furthermore, the pre-coating layer may contain additives such as thickeners, for example acrylate-based thickeners, surfactants and / or rheology modifiers. The use of cross-linking agents is also contemplated. Preferably, the pre-coating layer contains a zirconium-based cross-linking agent and is itself cross-linked with formaldehyde.

[0075] These additives are preferably contained in an amount of 0 to 2% by weight respectively. The amounts refer to the dried pre-coating layer in the final product.

[0076] The coating amount of the pre-coating layer is preferably 1 to 10 g / m 2 And particularly preferably 2 to 6 g / m 2 The amounts refer to the dried pre-coat layer in the final product.

[0077] If such a precoating layer (also called primer) is applied, this has the advantage that the paper surface is sealed and the further barrier layer applied thereon does not migrate into the paper. In addition, the precoating layer reduces the average roughness depth of the base paper and provides an advantageous holdout, characterized by a comprehensive coating and a defined surface energy, so that the applied barrier layer can be optimally formed. In addition, the precoating layer imparts layer adhesion between base paper and barrier layer, which can be important for subsequent sealing applications.

[0078] In a further preferred embodiment, the coated paper is characterized in that a sealing layer is provided on the third barrier layer, the sealing layer comprising at least one thermoplastic polymer.

[0079] Such a sealing layer is particularly useful in this case if the at least one hydrophobic polymer in the third barrier layer does not comprise a thermoplastic polymer, ie is not heat sealable.

[0080] The sealing layer preferably comprises a thermoplastic polymer based on polyacrylates, styrene / butadiene copolymers and / or polyolefins.

[0081] Suitable polymers are, in particular, acrylic acid esters, sodium polymethacrylate, polymethyl acrylate, polymethyl methacrylate, polyethyl acrylate, polyethyl methacrylate, poly(n-, iso- and tert-butyl acrylate), poly(n-, iso- and tert-butyl methacrylate), polycyclohexyl acrylate, polyethylhexyl acrylate and copolymers thereof, graft polymers, and copolymers with styrene, acrylonitrile, methylstyrene or vinyltoluene.

[0082] Suitable polymers are known, inter alia, under the trade names Vapor Coat 1300, BimBA 8888, Cartaseal SWF, Rhobarr 320, B-Coat WB 100, B-Coat 50 / 3, Chemipearl S300, Ultraseal W-952, Wükoseal 630, EurikaCoat 3624, Epotal SP 106, Hypod 2000, Extomine BS-OF 40%, Aquaseal X2200, Cartaseal SCR, CHT Coat 8080, Seacoat MB46HE and Extomine BG-EM48%.

[0083] The at least one thermoplastic polymer in the sealing layer is preferably contained in an amount of 1 to 100% by weight, particularly preferably 70 to 100% by weight or 70 to 99.5% by weight, relative to the total weight of the sealing layer.

[0084] The sealing layer can also contain additives such as thickeners, for example based on acrylates, surfactants, for example sulfosuccinates, extensional rheological additives, for example based on acrylates, waxes, additives for reducing wear sensitivity and increasing slip, such as layered silicates, in particular magnesium silicate hydrate or aluminum silicates, and / or crosslinkers.

[0085] These additives are preferably contained in an amount of 0 to 50% by weight, preferably 0 to 30% by weight, respectively, relative to the total weight of the sealing layer.

[0086] The coating amount of the sealing layer is preferably 1 to 10 g / m 2 And particularly preferably 1 to 5 g / m 2 This amount refers to the dried sealant layer in the final product. BRIEF DESCRIPTION OF THE DRAWINGS

[0087] In the following, embodiments of the present invention are explained in more detail with the aid of the accompanying drawings. In the accompanying drawings:

[0088] Figure 1 shows a fragment of coated paper used in the present invention,

[0089] Figure 2 A first embodiment of a package according to the invention is shown,

[0090] Figure 3 A second embodiment of a package according to the invention is shown,

[0091] Figure 4 A third embodiment of a package according to the invention is shown, and

[0092] Figure 5 A fourth embodiment of a package according to the invention is shown. DETAILED DESCRIPTION

[0093] Figure 1 The cross section of a fragment of the coated paper 1 used in the present invention is shown. The paper 1 comprises a base paper 2, for example having a basis weight of 20 to 120 g / m 2 or a stronger paper material, such as cardboard or thick paper. At least three different coatings are arranged on the base paper in an overlapping manner, more precisely starting from the base paper 2, in the order of a first barrier layer 3, a second barrier layer 4 and a third barrier layer 5. Here, the first barrier layer 3 comprises at least one hydrophobic polymer, while the second barrier layer 4 has at least one hydrophilic polymer and the third barrier layer 5 again comprises at least one hydrophobic polymer. As an alternative, Figure 1 It is shown that a sealing layer 6 can be additionally arranged on the third barrier layer 5, which sealing layer is fusible under the influence of pressure and / or heat and can have, in particular, at least one thermoplastic polymer. Optionally, a pre-coating layer 7 is also arranged between the base paper 2 and the first barrier layer 3, which pre-coating layer 7 can include inorganic pigments and a polymer binder.

[0094] Figure 2 A product 11 , such as a perishable food product, is received in an inner cavity 12 of the package 10 .

[0095] The package 10 has a first piece of packaging material 13, which in this embodiment forms a lid of the package 10. The first piece of packaging material 13 comprises a Figure 1 The coated paper 1 or the corresponding Figure 1 The coated paper 1 is made of a coated paper 1. The side of the coated paper 1 where the base paper 2 is located faces away from the inner cavity 12 of the package 10.

[0096] The package 10 also has a second packaging material element 14. The second packaging material element 14 can be a stretched tray made of plastic material.

[0097] The first packaging material piece 13 and the second packaging material piece 14 are connected to one another by a sealing seam 16 extending along an edge 15 of the package 10. The sealing seam 16 is circumferential and gas-tight, so that the package 10 is also closed as a whole gas-tightly, ie airtightly.

[0098] The inner cavity 12 of the package 10 may be evacuated or purged with an exchange gas (or an exchange gas mixture) such that the oxygen content of the atmosphere in the inner cavity 12 is below 3% or above 60%.

[0099] Figure 3A second embodiment of a package 10 according to the invention is shown. This package 10 also has a first packaging material piece 13 and a second packaging material piece 14, which are sealed to one another by means of a sealing seam 16. The package 10 is thus closed airtight. At least one of the two packaging material pieces 13, 14 is a coated paper 1. Here, as already described according to Figure 2 As described in the embodiment of FIG. 1 , the oxygen content in the inner cavity 12 of the package 10 can be less than 3% or greater than 60%.

[0100] Figure 4 A third embodiment of a package 10 according to the invention is shown, here in the form of a bag, as can be produced, for example, on a chamber vacuum packaging machine or a conveyor belt vacuum packaging machine. Figure 4 The package 10 is made of a single piece of packaging material 13, which is folded back on itself so that the third barrier layer 5 or the sealing layer 6 is located on the inside. The package 10 is hermetically closed by means of a sealing seam 16 at the neck of the bag. Here, the oxygen content in the inner cavity 12 of the package 10 can also be below 3% or above 60%.

[0101] at last, Figure 5 A fourth embodiment of a package according to the invention is shown. This form of package 10 can be produced, for example, on a soft bag packaging machine. Figure 5 The package 10 has a first packaging material piece 13 and a second packaging material piece 14, which correspond to Figure 1 of coated paper 1. Alternatively, according to Figure 5 The package 10 comprises only a single first packaging material piece 13 which is folded back on itself. The sealing seam 16 ensures the airtight closure of the package 10 .

[0102] The coated paper used in packaging may have, in particular (individually or cumulatively) the following features:

[0103] The first barrier layer comprises or is made of a substance selected from the group consisting of lipophilic substances, paraffins, especially hard paraffins, waxes, especially microcrystalline waxes, waxes based on plant oils or fats, waxes based on animal oils or fats, vegetable waxes, animal waxes, low molecular weight polyolefins, polyterpenes and mixtures thereof.

[0104] The passage of substances, in particular hydrophobic substances, is reduced or prevented by the second barrier layer.

[0105] The passage of substances, especially hydrophobic substances, from the first barrier layer into the third barrier layer or out of the third barrier layer or through the first barrier layer into the third barrier layer or out of the third barrier layer is reduced or prevented.

[0106] - preventing the passage of substances, in particular hydrophobic substances, from the third barrier layer into the first barrier layer or through the third barrier layer into the first barrier layer.

[0107] - reducing or preventing the passage of substances selected from the group consisting of lipophilic substances, paraffins, especially hard paraffins, waxes, especially microcrystalline waxes, waxes based on plant oils or fats, waxes based on animal oils or fats, vegetable waxes, animal waxes, low molecular weight polyolefins, polyterpenes and mixtures thereof.

[0108] -Except for unavoidable or permitted contamination, the third barrier layer is free of substances that are not allowed to come into direct contact with the food, in particular substances selected from the group consisting of lipophilic substances, paraffins, in particular hard paraffins, waxes, in particular microcrystalline waxes, waxes based on plant oils or fats, waxes based on animal oils or fats, vegetable waxes, animal waxes, low molecular weight polyolefins, polyterpenes and mixtures thereof. The packaging can preferably be used for packaging food fats or oily and / or greasy foods.

Claims

1. A package (10) comprising at least one first packaging material element (13), wherein the first packaging material element (13) comprises a coated paper (1), the coated paper comprising a base paper (2) and at least three coatings (3, 4, 5) applied in an overlapping manner to the base paper (2), wherein the at least three coatings (3, 4, 5) sequentially, starting from the base paper (2), comprise a first barrier layer (3) comprising at least one hydrophobic polymer, a second barrier layer (4) comprising at least one hydrophilic polymer and a third barrier layer (5) comprising at least one hydrophobic polymer, wherein the package is hermetically closed, wherein a precoating layer (7) comprising at least an inorganic pigment and a polymer binder is arranged between the base paper (2) and the first barrier layer (3), wherein no adhesion promoter is present between the individual layers of the coated paper and no barrier layers based on halogen-containing compounds, aluminum, Al2O3 and / or SiO2 are present.

2. The packaging according to claim 1, characterized in that The oxygen content of the atmosphere in the inner cavity (12) of the package (10) is lower than 3% or higher than 60%.

3. The packaging according to claim 1, characterized in that The oxygen content of the atmosphere in the inner cavity (12) of the package (10) is a maximum of 2% or at least 70%.

4. The packaging according to any one of claims 1 to 3, characterized in that The package (10) is sealed airtightly by means of at least one sealed seam (16).

5. The packaging according to claim 4, characterized in that The package (10) has only the first packaging material piece (13), and the first packaging material piece is sealed by itself.

6. The packaging according to claim 4, characterized in that The package (10) is produced on a soft bag packaging machine or a chamber vacuum packaging machine.

7. The packaging according to claim 4, characterized in that The package has a second piece of packaging material (14), and the first piece of packaging material (13) and the second piece of packaging material (14) are sealed to each other.

8. The packaging according to claim 7, characterized in that The second packaging material element (14) comprises a plastic material.

9. The packaging according to claim 8, characterized in that The second packaging material element (14) comprises a stretchable plastic material.

10. The package according to claim 7, characterized in that The second packaging material piece (14) comprises a coated paper (1), the coated paper comprising a base paper (2) and at least three coating layers (3, 4, 5) applied in an overlapping manner on the base paper (2), wherein the at least three coating layers (3, 4, 5) sequentially, starting from the base paper (2), comprise a first barrier layer (3) comprising at least one hydrophobic polymer, a second barrier layer (4) comprising at least one hydrophilic polymer and a third barrier layer (5) comprising at least one hydrophobic polymer.

11. The package according to claim 4, characterized in that The packages (10) are produced on a traysealer or a stretch wrapper.

12. The package according to any one of claims 1 to 3, characterized in that A sealing layer (6) is provided on the third barrier layer (5).

13. The package according to claim 12, characterized in that The sealing layer includes at least one thermoplastic polymer.

14. The package according to any one of claims 1 to 3, characterized in that The base paper (2) has a unit area weight of 20 to 120 g / m 2 .

15. The package according to claim 14, characterized in that The base paper (2) has a unit area weight of 40 to 100 g / m 2 .

16. The package according to any one of claims 1 to 3, characterized in that The first barrier layer (3) comprises at least one hydrophobic polymer based on polyacrylates and / or polyolefins.

17. The package according to any one of claims 1 to 3, characterized in that The second barrier layer (4) comprises at least one hydrophilic polymer based on polyvinyl alcohol.

18. The package according to any one of claims 1 to 3, characterized in that The third barrier layer (5) comprises at least one hydrophobic polymer based on polyacrylates, styrene / butadiene copolymers and / or polyolefins.

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