EP3821075B1 - Packaging system - Google Patents

Description

The present invention relates to a packaging system (1), in particular a food packaging system, comprising or consisting of A) a first paper layer (2) comprising particulate activated carbon, having a front side and a back side opposite the front side, B) one on the front side and/or back side of the Paper layer (2) or a first barrier layer (4) arranged on at least one side of a carrier paper (3), consisting of or comprising a binder and a pigment, and C) a second barrier layer (5) arranged on the first barrier layer (4). of or comprising an acrylate copolymer and a wax. The present invention also relates to the use of a packaging system according to the invention as packaging and a method for producing a packaging system according to the invention. Further aspects of the present invention emerge from the following description and the claims.

Groceries are commonly sold in packaging made from paperboard, cardboard and/or paper. High demands are placed on the packaging, especially in the case of fatty foods. When conventional paper-based packaging is used, fat from the food can penetrate the packaging material in the case of food containing fat. This can cause the packaging material to soften and tear, or cause a Contamination of other items with the grease occurs when they come into contact with the packaging.

A wood-free "sandwich paper" is often used to package fatty foods, which has a certain grease resistance due to the greasy grinding of the fibers. However, the grease resistance of these sandwich papers is often not sufficient.

A composite packaging material is often used as a grease-resistant alternative to greaseproof paper. A composite packaging material can consist, for example, of a composite material formed from paper and a plastic and/or aluminum foil. If there is no polyethylene (PE) coating, fluorocarbons can be used as water repellent chemicals. For example, paper is coated on one side with polyethylene, often in an energy-intensive extrusion process, or with aluminum foil. These composite packaging materials are characterized by high grease resistance. However, if these composite packaging materials are used for paper recycling, these materials disrupt the recycling process considerably. Due to the film layer, the composite packaging materials cannot be fiberized sufficiently well during the recycling process and so-called wet-strength specks form. The specks are the remains of the plastic or aluminum foil to which paper fibers are still attached. These specks have to be laboriously removed during the recycling process. The necessary separation of the flakes in the pulp preparation process results in a not inconsiderable loss of pulp, which is withdrawn from the process. It is also not possible to compost these composites, since the plastic or aluminum foils used do not biodegrade.

document WO 2010/042162 A1 discloses a coated paper or paperboard having a multilayer coating to improve oil and grease resistance properties, oxygen barrier properties and water vapor barrier properties.

In the DE 10 2014 119 572 A1 describes a packaging paper for foodstuffs with a basis weight of between 20 g/m ² and 40 g/m ² and with a mass fraction of filler which is less than 20% based on the mass of the uncoated paper. The packaging paper has a coating on at least one side, which comprises a vegetable oil encapsulated in a polymer, talc and a binder.

In the U.S. 2015/0274350 A1 describes packaging made of paper or cardboard, which has at least one barrier layer and can be produced by emulsion polymerisation, the emulsion polymerisation taking place in the presence of at least one carbohydrate compound.

In addition to the grease resistance of packaging materials, resistance to water and water vapor permeability are also very important. If, for example, moist goods are to be stored in the packaging for a longer period of time, then it must be ensured that the goods do not dry out during storage. At the same time, it must also be ensured that the moist goods do not soften the packaging and damage the packaging as a result. When storing dry goods, such as oatmeal or muesli, on the other hand, it must be ensured that the goods remain dry and do not soften during storage.

When storing food in packaging, especially shipping packaging, it must also be ensured that the food does not absorb any smells or tastes from other foods or environmental influences, such as vehicle exhaust fumes, or if the food itself has an intense smell and/or taste, does not give this off to the environment. During storage and in particular during transport, it may be necessary to protect the packaged goods from mechanical influences, for example in the case of chocolate shavings as packaged goods.

For ecological reasons, materials that are made entirely or partially from recycled fibers are often used for the production of packaging materials. The problem with the use of recycled fibers is the high proportion of newsprint, which is usually printed with inks containing mineral oil. Despite special cleaning steps and treatment of the recycled fibers, a proportion of mineral oil substances that cannot be completely avoided remains in the recycled fibers. Packaging made from recycled fibers can contain approximately 100 ppm to 500 ppm mineral oil residues.

In food packaging in particular, but also in other products that may contain recycled fibers that come into contact with food, for example, the problem arises that the mineral oil substances can migrate from the packaging into the food. However, the intake of mineral oil substances such as "mineral oil saturated hydrocarbons" (MOSH) and/or "mineral oil aromatic hydrocarbons" (MOAH) through consumption of the food should be avoided, as even the smallest amounts can cause damage to health, such as cancer .

The object of the invention is therefore to eliminate the disadvantages outlined above and to meet the packaging requirements outlined above.

In particular, packaging should be made available that can be fed into paper recycling in its entirety without the packaging having to be processed beforehand (e.g. separating plastic or metal foils) or the recycling process being impaired by the formation of specks or other rejects, such as foils. In addition, the packaging material should be designed in such a way that it is suitable for contact with food and has low water and water vapor permeability, high fat resistance and a high barrier effect against flavorings. In addition, it should be possible for at least part of the packaging to be produced partially or completely from recycled fibers, thereby at least sufficiently reducing the migration of mineral oil substances from the packaging material into another product in a safe and simple manner.

1. A) einer ersten Papierschicht (2) umfassend partikuläre Aktivkohle, aufweisend eine Vorderseite und eine der Vorderseite gegenüberliegende Rückseite, wobei die Papierschicht aus einem Massenanteil von größer gleich 50 % Recyclingfasern besteht, bezogen auf die Gesamtmasse der Fasern in der Papierschicht,
2. B) einer auf der Vorderseite und/oder Rückseite der Papierschicht (2) oder auf mindestens einer Seite eines Trägerpapiers (3) angeordneten ersten Barriereschicht (4), bestehend aus oder umfassend ein Bindemittel und ein Pigment, und
3. C) einer auf der ersten Barriereschicht (4) angeordneten zweiten Barriereschicht (5), bestehend aus oder umfassend ein Acrylat-Copolymer und ein Wachs.

According to the invention, these objects are achieved by a packaging system (1), in particular a food packaging system, comprising or consisting of

1. A) a first paper layer (2) comprising particulate activated carbon, having a front side and a back side opposite the front side, the paper layer consisting of a mass fraction of greater than or equal to 50% recycled fibers, based on the total mass of the fibers in the paper layer,
2. B) a first barrier layer (4) arranged on the front and/or back of the paper layer (2) or on at least one side of a backing paper (3), consisting of or comprising a binder and a pigment, and
3. C) a second barrier layer (5) arranged on the first barrier layer (4), consisting of or comprising an acrylate copolymer and a wax.

Surprisingly, it has been shown in our own investigations that the combination of a first barrier layer, consisting of or comprising a binder and a pigment, and a second barrier layer, consisting of or comprising an acrylate copolymer and a wax, to extremely low water vapor permeability and to leads to particularly high water and grease resistance. In addition, the particulate activated carbon inside the paper layer reduces or prevents the migration of organic materials, such as mineral oil substances, odorous substances or flavorings, through the first paper layer. Mineral oil substances (MOSH and/or MOAH), which are already contained within the paper layer due to the use of recycled fibers, are prevented from to migrate out of the paper layer. At the same time, passage of organic materials, such as mineral oil substances, odorous substances or flavoring substances, is reduced or prevented through the first paper layer. Since the use of foils, in particular no plastic or aluminum foils, can be dispensed with, the packaging system is also recyclable. During defibration in the recycling process, a packaging system according to the invention forms a pulp without the formation of specks or other rejects. The packaging system according to the invention can thus be completely fed into paper recycling (pulp recycling).

In the packaging system according to the invention, the use of extruded, glued-on foils or metal foils that are vapor-deposited or glued on is preferably completely dispensed with, since the individual layers of the packaging system according to the invention are produced by the application of dispersions. The individual layers of the packaging system according to the invention are not extruded and preferably also do not contain any further extruded, glued or vapor-deposited films.

A packaging system according to the invention is preferred, wherein the activated carbon is formed at least partially from a vegetable material, in particular coconut shells. Such an activated carbon has particularly good mineral oil absorption properties.

In a preferred embodiment, the activated carbon can be provided in granular form. The fineness of grinding can be about 80%, for example about 45 mm. The water content when the activated carbon is packaged can preferably be at most 10%, in particular 7%. The ash content can be a maximum of 3%, preferably 1%. Acidic components of the activated carbon can be a maximum of 3%, preferably 0.8%. In addition, the water-soluble fraction can be a maximum of 0.2%, in particular 0.05%. The pH of the activated carbon can range from 5 to 7 and is preferably 6.5. Furthermore, the minimum iodine number can be 900 mg/g, in particular 950 mg/g. The specific surface area (BET) of the activated carbon particles can be around 1000 m ² /g.

In an alternative embodiment of the present invention, an alternative filter material for binding mineral oil substances can be used instead of particulate activated carbon. Furthermore, different filter materials can be used simultaneously, e.g. B. a combination of activated carbon and another filter material.

A packaging system according to the invention is preferred in which the activated carbon has an average particle diameter d50 in the range between 1 μm and 100 μm. Activated carbon particles can easily penetrate a fiber layer. At the same time (possibly through additives) an undesired escape of the activated carbon from the first paper layer can be prevented. Furthermore, activated carbon can bind mineral oil substances and other organic compounds almost permanently, at least during the usual service life of the packaging system (usually less than two years). It goes without saying that the activated carbon can be, in particular, an activated carbon suitable for food.

The activated carbon can be distributed (almost) evenly in the paper layer. In principle, a partial penetration of the paper layer is sufficient. In order to prevent the activated charcoal from escaping from the paper layer, the proportion of activated charcoal in an inner area of the paper layer can preferably be greater than on the outer surfaces.

A packaging system according to the invention is preferred, wherein the mass fraction of particulate activated carbon in the first paper layer (2) is 0.1 to 20%, preferably 0.3 to 10%, particularly preferably 0.5 to 5%, more preferably 0. Is 5 to 3%, based on the total mass of the first paper layer.

Our own investigations have shown that the migration of mineral oil substances from the packaging material is further reduced with an increasing proportion of particulate activated carbon in the first paper layer. It has also been shown that even small amounts (approx. 0.1%) of particulate activated carbon already bring about a reduction in the migration of mineral oil substances (MOSH and MOAH). With mass fractions of less than 0.1%, however, a sufficient effect is often not obtained. With higher amounts of particulate activated carbon, the migration of mineral oil substances is increased further, but our own investigations have shown that the stability of the first paper layer often decreases with mass fractions of more than 20%. Amounts of about 1 to 2% have proven particularly advantageous.

A packaging system according to the invention is preferred, wherein at least one further layer (2.1, 2.2, 6, 6.1) connected to the first paper layer is provided.

It is particularly preferred here that the at least one further layer is a further paper layer comprising activated carbon (4.1) or the further layer is a protective layer (6, 6.1).

A packaging system according to the invention is preferred, wherein the mass fraction of particulate activated carbon in the further paper layer (4.1) is 0.1 to 20%, preferably 0.3 to 10%, particularly preferably 0.5 to 5%, more preferably 0. Is 5 to 3%, based on the total mass of the other paper layer.

A packaging system according to the invention is preferred, wherein two further layers (2.1, 2.2) connected to the first paper layer are provided, and preferably the first paper layer (2) with the two further paper layers (2.1, 2.2) is designed as a single-ply corrugated board. It goes without saying that, according to other variants of the invention, two- or multi-layer corrugated cardboard and/or different corrugated types, such as B corrugated, C corrugated, F corrugated, etc., can also be provided.

A packaging system according to the invention is preferred, wherein the packaging system has a migration value of MOSH and MOAH of at least less than 2 mg/kg, preferably less than or equal to 0.6 mg/kg, more preferably less than or equal to 0.4 mg/kg. The migration is preferably determined by using modified polyphenylene oxides (MPPO) ( ^Tenax® ) according to DIN EN 14338:2004-03. Here, the modified polyphenylene oxide (MPPO; Tenax ^® ) is regarded as a substitute food test. In this case, the second barrier layer of the packaging system according to the invention is covered with modified polyphenylene oxide (MPPO; ^Tenax® ) and stored in a conventional oven at 40° C. for 10 days. After storage, the polyphenylene oxide (MPPO; Tenax ^® ) is extracted with hexane for chromatography. The migration value of MOSH and MOAH in this extract is determined using GC-FID.

In a preferred embodiment of the present invention, the wax in the second barrier layer is a saturated hydrocarbon wax.

Our own investigations have shown that when waxes from saturated hydrocarbons are used, packaging systems with particularly high grease resistance and water resistance can be obtained. In addition, it has been shown that acrylate copolymers are particularly compatible with waxes made from saturated hydrocarbons and a uniform and stable second barrier layer can therefore be formed. Especially when heat sealing when the barrier layer is heated to temperatures above 90 °C, no undesired segregation or cluster formation occurs with a mixture of acrylate copolymer and wax from saturated hydrocarbons.

According to the invention, preference is given to packaging systems in which the wax has a melting point above 40.degree. C., preferably above 50.degree. C., particularly preferably above 60.degree.

Our own investigations have shown that very good results can be obtained when using waxes with a melting point of over 30 °C. Surprisingly, however, it could be shown that the resistance of the packaging system to mechanical stress can be increased when using waxes with a melting point of more than 40.degree. This resistance is further increased with even higher melting points of the waxes. Our own investigations have also shown that the optimal melting point of the wax is in the range of 60 to 80 °C if the packaging systems are also to be used at temperatures between 6 °C and 30 °C. If the packaging systems are also to be used at higher temperatures, it can make sense to use a wax with a higher melting point.

According to the invention, preference is given to packaging systems in which the wax has a melting point of less than 100°C, preferably less than 90°C, particularly preferably less than 80°C.

According to the invention, preference is given to packaging systems in which the wax has a melting point in the range from 40°C to 100°C, preferably in the range from 50°C to 90°C, particularly preferably in the range from 60°C to 80°C.

According to the invention, preference is given to packaging systems in which the proportion by mass of the wax in the second barrier layer is 5 to 60%, preferably 15 to 50%, particularly preferably 20 to 40%, based on the total mass of the second barrier layer.

Our own investigations have surprisingly shown that with a wax mass fraction of less than 5%, the barrier properties against fat, oil and moisture decrease disproportionately while with a wax mass fraction of over 60%, excellent barrier properties can be obtained, but the mechanical resistance of the barrier layer decreases disproportionately. Our own investigations have shown that particularly good packaging systems with optimal barrier and mechanical properties can be obtained if the proportion of wax is 20 to 40%.

Packaging systems are preferred according to the invention, in which the wax based on saturated hydrocarbons contains or consists of one, two, three or more than three alkanes selected from the group consisting of heneicosane, docosane, tricosane, tetracosane, pentacosane, hexacosane, heptacosane, octacosane, nonacosane, Triacontane, hentriacontane, dotriacontane, tritriacontane, tetratriacontane, pentatriacontane, hexatriacontane, heptatriacontane, octatriacontane and nonatriacontane, preferably selected from the group consisting of hexacosane, heptacosane, octacosane, nonacosane and triacontane. According to the invention, particular preference is given to packaging systems in which the wax based on saturated hydrocarbons is a wax based on octacosane.

1. a) mindestens 26 Kohlenstoff-Atome, vorzugsweise mindestens 28 Kohlenstoff-Atome umfasst
   und/oder
2. b) maximal 39 Kohlenstoff-Atome, vorzugsweise maximal 33 Kohlenstoff-Atome enthält. Erfindungsgemäß bevorzugt sind Verpackungssysteme, wobei das Wachs Kohlenwasserstoffe umfasst oder daraus besteht, die 26 bis 39 Kohlenstoff-Atome, vorzugsweise 28 bis 33 Kohlenstoff-Atome umfasst.

According to the invention, preference is given to packaging systems in which the wax comprises or consists of hydrocarbons

1. a) comprises at least 26 carbon atoms, preferably at least 28 carbon atoms
   and or
2. b) contains a maximum of 39 carbon atoms, preferably a maximum of 33 carbon atoms. According to the invention, preference is given to packaging systems in which the wax comprises or consists of hydrocarbons which comprise 26 to 39 carbon atoms, preferably 28 to 33 carbon atoms.

According to the invention, packaging systems are preferred which do not comprise any degraded starch, starch and/or amylopectins in the first paper layer (2), in the carrier paper (3), in the first barrier layer (4) and/or in the second barrier layer (5) and in particular contains no carbohydrates.

According to the invention, the acrylate copolymer in the second barrier layer is particularly preferably a copolymer with an average molar mass in the range from 50,000 to 150,000 g/mol, preferably in the range from 80,000 to 130,000 g/mol. particularly preferably in the range from 90,000 to 100,000 g/mol. The mean molar mass is determined with the aid of gel permeation chromatography (GPC) with tetrahydrofuran (THF; tetramethylene oxide; 1,4-epoxybutane; oxacyclopentane) as the solvent, polystyrene as the standard and detection using an RI detector (refractive index detector).

Our own investigations have shown that acrylate copolymers with an average molar mass of more than 50,000 g/mol or more than 80,000 g/mol form a particularly stable second barrier layer, especially if they are mixed with wax.

According to the invention, the acrylate copolymer in the second barrier layer is particularly preferably a copolymer produced using two, three, four, five, six or all of the monomers selected from the group consisting of methyl acrylate, methyl methacrylate, butyl acrylate, butyl methacrylate, 2-ethylhexyl ester, 2-ethylhexyl methacrylate and styrene.

The properties of the resulting acrylate copolymer can be optimized by selecting the monomers used to prepare the acrylate copolymer. Our own investigations have surprisingly shown that an acrylate copolymer made from methyl acrylate, methyl methacrylate, butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate and/or styrene has particularly good barrier properties and is combined with the wax or In particular, it is compatible with the wax based on saturated hydrocarbons. Without wishing to be bound by any theory, it is currently assumed that the compatibility of wax and acrylate copolymer is a result of the optimally matching polarities of both substances. If the differences between the polarities of the binder and wax are too great, compatibility decreases and segregation can even occur. Our own investigations have shown that acrylate copolymers and wax, and in particular acrylate copolymers that are produced from the monomers described above, with wax based on saturated hydrocarbons have an optimal ratio of the polarities of the two substances.

In addition to methyl acrylate, methyl methacrylate, butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate and styrene, other monomers may have been used to produce the acrylate copolymer or the copolymer was produced from two, three, four, five, six or all monomers selected from the group consisting of methyl acrylate, methyl methacrylate, butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate and styrene.

According to the invention, the acrylate copolymer is particularly preferably a random copolymer. Acrylate copolymers can also be produced as block copolymers, for example. However, it has been shown that when block acrylate copolymers are used, phases are formed in which blocks of the same monomer units agglomerate. This phase formation in block copolymers can be disadvantageous according to the invention.

It is preferred according to the invention if the mass fraction of the acrylate copolymer, which is present in the second barrier layer in addition to the wax, is 40 to 95% in the second barrier layer, preferably 50 to 85%, particularly preferably 60 to 80%, based on the total mass of the second barrier layer.

Our own investigations have shown that a content of acrylate copolymer, which is present in the second barrier layer alongside the wax, below a mass fraction of 40% leads to packaging systems in which the mechanical stability of the second barrier layer decreases disproportionately. With an acrylate copolymer content of more than 95% by mass, the mechanical resistance of the second barrier layer is sufficiently high, but it has been shown that the barrier properties against fat, oil and moisture decrease disproportionately. Our own investigations have shown that particularly good packaging systems with optimal barrier and mechanical properties can be obtained if the content of acrylate copolymer is 20 to 40% by mass.

It has also been found that the second barrier layer has the property of being heat sealable. This makes it possible for packaging systems according to the invention to be sealed by heat sealing.

According to the invention, it is particularly preferred if the mass fraction of the acrylate copolymer in the second barrier layer is 40 to 95% and the mass fraction of the wax in the second barrier layer is 5 to 60%, and it is even more preferred if the mass fraction of the acrylate copolymer in the second barrier layer is 50 to 85% and the mass fraction of the wax in the second barrier layer is 15 is to 50% and it is even more preferred if the mass fraction of the acrylate copolymer in the second barrier layer is 60 to 80% and the mass fraction of the wax in the second barrier layer is 20 to 40%.

In addition to the acrylate copolymer, other polymers or additives can also be contained in the second barrier layer. It is preferred according to the invention if the second barrier layer consists of acrylate copolymer, wax and a mass fraction of at most 10%, preferably at most 5%, of other substances that are not acrylate copolymer or wax, based on the total mass of the second barrier layer.

A packaging system according to the invention is preferred, wherein the mass per unit area of the second barrier layer is in the range from 2.5 to 7.4 g/m ² , preferably in the range from 2.8 to 6.5 g/m ² , more preferably in the range from 2.9 to 5.2 g/m ² .

A packaging system according to the invention is preferred, wherein the second barrier layer is a dispersion layer.

In the context of the present invention, a dispersion layer is understood as meaning a layer which has been produced from a dispersion, usually an aqueous dispersion. It is therefore preferred according to the invention if the second barrier layer was produced from a dispersion. In a dispersion layer, the individual polymer molecules are not distributed homogeneously, but can be present in separate phases in some cases, with individual phases being able to be present separately from one another. It is spoken of a quasi close order. The presence of phases is a result of the manufacturing process in which the layers are made from a dispersion in which the polymers are already present in disperse phases. After removing the dispersion medium, mostly water, no film is formed.

In the context of the present invention, a film is understood to mean a very thin (<1 mm) sheet of metal or plastic which has constant strength along its entire dimension and contains a long-range order of the molecular structure. In the case of plastic films, the constant strength is a result of the polymer molecules that are homogeneously distributed in the film. The main characteristic of plastic films is their ability to be wrapped on or around objects and to conform to their shape. An inventive Packaging system is preferred, wherein the first barrier layer and/or the second barrier layer are not formed as a film.

The main difference between a film and a dispersion layer according to the present invention is that a film is also durable as a standalone layer, i.e. without a base paper, while a dispersion layer is not stable as a standalone layer, i.e. not without a support medium.

A packaging system according to the invention is preferred, wherein the pigment in the first barrier layer is an organic pigment, an inorganic pigment or a mixture of organic pigment and inorganic pigment.

A packaging system according to the invention is particularly preferred wherein the pigment in the first barrier layer is an inorganic pigment selected from the list consisting of calcined kaolin, kaolin, kaolinite, magnesium silicate hydrate, silica, bentonite, calcium carbonate, aluminum hydroxide, alumina and boehmite.

A packaging system according to the invention is particularly preferred, in which the pigment in the first barrier layer is in the form of flakes.

Our own investigations, in which non-platelet-shaped pigments were compared with platelet-shaped pigments, surprisingly showed that the use of platelet-shaped pigments leads to particularly good properties of the first barrier layer or of the corresponding packaging system. When using flaky pigments in the first barrier layer, the individual flakes of the pigment are stacked on top of each other in an offset manner, resulting in a very dense layered structure that has a high barrier effect. Pigments that are not in the form of platelets do not form these layered structures. Platelet-shaped (also referred to as flake-shaped or flake-like) is understood to mean particles that have a significantly larger diameter than thickness.

It is particularly preferred according to the invention if the platelet-shaped pigment has a (preferably average) aspect ratio of 5 to 100, preferably 15 to 100, more preferably 20 to 80. The aspect ratio (also "aspect ratio" or "shape factor ") is the quotient between the diameter and the thickness of the platelet of inorganic pigment before mixing with the other components. An aspect ratio of 15 means that the diameter of the platelet is 15 times greater than the thickness of the platelet.

A packaging system according to the invention is preferred in which the mass fraction of the pigment in the first barrier layer is 5 to 60%, preferably 15 to 40%, particularly preferably 20 to 40%, based on the total mass of the first barrier layer.

A packaging system according to the invention is preferred, wherein the binder in the first barrier layer is an acrylate polymer or acrylate copolymers.

A packaging system according to the invention is preferred, wherein the binder in the first barrier layer is an anionic acrylate polymer or an anionic acrylate copolymer.

A packaging system according to the invention is preferred, wherein the binder in the first barrier layer is a copolymer made using one, two, three or all monomers selected from the group consisting of butyl methacrylate, butyl acrylate, methacrylonitrile, acrylonitrile, α-methylstyrene and styrene.

A packaging system according to the invention is preferred wherein the binder in the first barrier layer is a copolymer made using butyl acrylate, acrylonitrile and styrene.

A packaging system according to the invention is preferred, wherein the mass per unit area of the first barrier layer is in the range from 1.5 to 6.4 g/m ² , preferably in the range from 1.8 to 5.5 g/m ² , more preferably in the range from 1.9 to 4.2 g/m ² .

In addition to the binder and the pigment, other polymers or additives can also be contained in the second barrier layer. It is preferred according to the invention if the first barrier layer consists of an acrylate polymer or acrylate copolymer, a pigment and a mass fraction of at most 5%, preferably at most 2.5% of other substances (eg additives) that are not acrylate polymers or acrylate -Copolymers or pigments, based on the total mass of the second barrier layer.

1. A) einer ersten Papierschicht (2) umfassend partikuläre Aktivkohle, aufweisend eine Vorderseite und eine der Vorderseite gegenüberliegende Rückseite,
2. B) einer auf der Vorderseite und/oder Rückseite der Papierschicht (2) angeordneten ersten Barriereschicht (4), bestehend aus oder umfassend ein Bindemittel und ein Pigment und
3. C) einer auf der ersten Barriereschicht (4) angeordneten zweiten Barriereschicht (5), bestehend aus oder umfassend ein Acrylat-Copolymer und ein Wachs.

In one embodiment of the packaging system according to the invention, the packaging system comprises or the packaging system consists of

1. A) a first paper layer (2) comprising particulate activated carbon, having a front side and a back side opposite the front side,
2. B) a first barrier layer (4) arranged on the front and/or back of the paper layer (2), consisting of or comprising a binder and a pigment and
3. C) a second barrier layer (5) arranged on the first barrier layer (4), consisting of or comprising an acrylate copolymer and a wax.

In this configuration, the first barrier layer (4) and the second barrier layer (5) are present as a laminate with the first paper layer (2) and optionally further paper layers or further layers. For this purpose, the first barrier layer (4) is usually applied directly to one side of the paper layer (2) and then coated with the second barrier layer (5).

1. A) einer ersten Papierschicht (2) umfassend partikuläre Aktivkohle, aufweisend eine Vorderseite und eine der Vorderseite gegenüberliegende Rückseite,
2. B) auf mindestens einer Seite eines Trägerpapiers (3) angeordneten ersten Barriereschicht (4), bestehend aus oder umfassend ein Bindemittel und ein Pigment und
3. C) einer auf der ersten Barriereschicht (4) angeordneten zweiten Barriereschicht (5), bestehend aus oder umfassend ein Acrylat-Copolymer und ein Wachs.

In an alternative embodiment of the packaging system according to the invention, the packaging system comprises or the packaging system consists of

1. A) a first paper layer (2) comprising particulate activated carbon, having a front side and a back side opposite the front side,
2. B) on at least one side of a carrier paper (3) arranged first barrier layer (4), consisting of or comprising a binder and a pigment and
3. C) a second barrier layer (5) arranged on the first barrier layer (4), consisting of or comprising an acrylate copolymer and a wax.

In this embodiment, the packaging system comprises a first paper layer (2) and a possibly spatially separate laminate made of a carrier paper (3), a first barrier layer (4) and a second barrier layer (5). In this embodiment, there is no laminate between the first paper layer and the laminate consisting of carrier paper (3), first and second barrier layer (4, 5).

For example, the packaging system can consist of a folding carton, which includes or consists of a first paper layer (2) and an inner bag contained in the folding carton, which consists of a carrier paper (3) and a first and second barrier layer (4, 5) arranged thereon. The inner bag can be freely removable (e.g. together with the contents of the bag) or fixed in the carton, for example by (possibly partially) gluing or connecting the inner bag to the carton.

In the context of the present invention, a distinction is made between the paper layer (2) comprising particulate activated carbon and the backing paper (3). Both layers or paper differ only in the presence of particulate activated carbon. The other components can be identical or can differ from one another. The following statements on the backing paper therefore also apply to the paper layer (2), with the paper layer additionally containing particulate activated carbon.

In the context of the present invention, the term carrier paper is used as a generic term, which also includes carrier cardboard and carrier cardboard. A backing paper is a flat material that essentially consists of fibers of mostly vegetable origin and is formed by dewatering a fiber suspension. The basis weight should not be restricted by the term backing paper.

A packaging system according to the invention is preferred in which the carrier paper is paper, cardboard or cardboard. If the backing paper is cardboard, it can, for example, be in the form of solid cardboard or corrugated cardboard (e.g. single-wall or double-wall). It goes without saying that, according to other variants of the invention, two- or multi-layer corrugated cardboard and/or different corrugated types, such as B corrugated, C corrugated, F corrugated, etc., can also be provided.

A packaging system according to the invention is particularly preferred, wherein the carrier paper is a paper with a basis weight in the range from 30 to 150 g/m ² , a cardboard with a basis weight of more than 150 g/m ² and less than 225 g/m ² or is paperboard with a basis weight of more than 225 g/m ² .

A packaging system according to the invention is particularly preferred, wherein the carrier paper is a paper with a basis weight in the range from 25 to 80 g/m ² , preferably with a basis weight in the range from 30 to 60 g/m ² is, more preferably having a basis weight in the range of 35 to 50 g/m ² .

A packaging system according to the invention is very particularly preferred, wherein the carrier paper is a paper with a basis weight in the range from 25 to 80 g/m ² , preferably with a basis weight in the range from 30 to 60 g/m ² , particularly preferably with a basis weight is in the range 35 to 50 g/m ² and the paper layer (2) is board with a basis weight of more than 150 g/m ² and less than 225 g/m ² or paperboard with a basis weight of more than is 225 ^gsm .

A packaging system according to the invention is preferred, wherein the paper layer (2) is cardboard or paperboard. If the paper layer (2) is cardboard, it can, for example, be in the form of solid cardboard or corrugated cardboard (e.g. single-wall or double-wall). It goes without saying that, according to other variants of the invention, two- or multi-layer corrugated cardboard and/or different corrugated types, such as B corrugated, C corrugated, F corrugated, etc., can also be provided.

A packaging system according to the invention is preferred in which the carrier paper contains no organic or inorganic pigments. In one embodiment, the carrier paper is base paper.

A packaging system according to the invention is preferred, wherein the carrier paper contains a cellulose with a Schopper-Riegler degree in the range from 24 to 54°SR, preferably in the range from 29 to 49°SR, particularly preferably in the range from 34 to 44°SR.

A packaging system according to the invention is preferred, wherein the carrier paper has a short-fiber pulp with a Schopper-Riegler grade of at least 30°SR and/or a long-fiber pulp with a Schopper-Riegler grade of at least 24°SR.

A packaging system according to the invention is preferred, wherein the carrier paper comprises or consists of a cellulose that comprises a short-fiber cellulose and a long-fiber cellulose. A mass ratio between short-fiber pulp and long-fiber pulp in the range from 2:1 to 1:2, preferably in the range from 1.5:1 to 1:1.5, particularly preferably about 1:1 is preferred.

Our own investigations have shown that the combination of a short-fiber pulp and a long-fiber pulp with the Schopper-Riegler grades used according to the invention leads to a particularly dense paper which has a very high barrier effect against fat. This barrier effect can be improved even further if the Schopper-Riegler degree is in the ranges marked as preferred or particularly preferred or has the values marked as preferred or particularly preferred.

Our own investigations have shown that particularly good properties of the resulting packaging system are obtained if the base paper is made from a mixture of short-fiber cellulose and long-fiber cellulose and this mixture is leveled again before the base substrate is manufactured in order to achieve the desired schopper -Riegler degree in the range from 24 to 54°SR, preferably in the range from 29 to 49°SR, particularly preferably in the range from 34 to 44°SR. The short-fiber and long-fiber cellulose used before grinding can have a Schopper-Riegler degree that is outside the preferred range. The Schopper-Riegler grade of the short-fiber pulp and long-fiber pulp used is preferably smaller before the beating than after the beating.

In one embodiment, the packaging system according to the invention is a packaging system in which the short-fiber pulp consists entirely or partially, preferably at least to a mass fraction of more than 50%, based on the total mass of the short-fiber pulp, of fibers from hardwoods, preferably made of birch fibers, beech fibers or eucalyptus fibers and the long-fiber pulp consists entirely or partially, preferably at least more than 50%, based on the total mass of the long-fiber pulp, of fibers from coniferous trees, preferably pine fibers, spruce fibers or fir fibers.

A packaging system according to the invention is preferred, wherein the carrier paper comprises a mass fraction of at least 70% short-fiber pulp, preferably between 70 and 75% short-fiber pulp, based on the total mass of short-fiber pulp and long-fiber pulp.

A packaging system according to the invention is preferred in which the backing paper consists of virgin fibers or has a mass fraction of greater than or equal to 50%, preferably greater than or equal to 80%, particularly preferably greater than 95% of fresh fibers, based on the total mass of the fibers in the backing paper.

A packaging system according to the invention is preferred, wherein the paper layer consists of recycled fibers or has a mass fraction of greater than or equal to 65%, particularly preferably greater than 85%, of recycled fibers, based on the total mass of the fibers in the paper layer.

In the context of the present invention, fresh fibers are understood as meaning a pulp which is obtained directly from the plant starting material (usually wood or grass). Fresh fibers are to be distinguished from recycled fibers that have previously been used at least once in other paper or cardboard products, i.e. that consist of waste paper, waste cardboard and/or waste cardboard.

The backing paper, the first barrier layer and the second barrier layer can also contain the additives customarily used in papermaking, such as sizing agents, pigments (in addition to the pigments already described above), optical brighteners, biocides, dispersing agents, release agents, antifoams, retention aids, Fixing agents, flocculants, deaerators, wetting agents, leveling agents, slime control agents or thickeners. The additives are usually used to adjust the properties of the coating compositions used to produce the respective layer (e.g. defoamers or retention aids) or to adjust the properties of the resulting layer (e.g. optical brighteners).

A packaging system according to the invention is preferred, in which case the backing paper has further layers on the back. For example, the back can be coated with a starch layer, preferably modified starch, particularly preferably modified corn starch. The properties of the packaging system can be improved by coating the back. For example, it is thus possible to ensure that the packaging system can be printed on the back.

A packaging system is preferred according to the invention, the packaging system having a fat permeability with turpentine oil according to Tappi 454 om-10 of at least 1300 s, preferably at least 1500 s, particularly preferably at least 1800 s on the second barrier layer.

A packaging system is preferred according to the invention, the packaging system on the second barrier layer being based on Tappi 454 om-10 water resistance greater than 240 seconds, preferably greater than 400 seconds, more preferably greater than 600 seconds.

A packaging system is preferred according to the invention, wherein the packaging system has a water vapor permeability according to DIN 53122-1 at a climate of 23 ° C and 85% humidity of less than or equal to 300 g / (m ² d), preferably less than or equal to 250 g / (m ² d ), particularly preferably less than or equal to 125 g/(m ² d).

Surprisingly, it has been shown that the packaging system according to the invention not only has very high resistance to fat, but also low water vapor permeability. Low water vapor permeability in packaging is desirable for food, since the packaged food does not dry out prematurely and stays fresh for longer.

A packaging system is preferred according to the invention, wherein the packaging system has a fat permeability of at least level 5, preferably at least level 3, particularly preferably at least level 1; measured according to method DIN 53116.

Our own research has shown that packaging systems according to the invention can have a KIT value in excess of 12 and thus exhibit excellent bed resistance, which is in the same range as the grease resistance of packaging systems coated with plastic or aluminum foil.

A packaging system is preferred according to the invention, the packaging system having a sealing strength at 500 kPa, 150° C. and 1 s of greater than or equal to 3.0 N/15mm, preferably a sealing strength of greater than or equal to 3.5 N/15mm, particularly preferably greater equal to 4.2 N/15mm.

A packaging system is preferred according to the invention, wherein the mass per unit area of the packaging system is in the range from 30 to 800 g/m ² , preferably in the range from 35 to 600 g/m ² , particularly preferably in the range from 40 to 250 g/m ² .

A packaging system is preferred according to the invention, the packaging system being a paper with a mass per unit area in the range from 30 to 150 g/m ² , a cardboard with a basis weight of more than 150 g/m ² and less than 225 g/m ² or is a paperboard with a basis weight of more than 225 g/m ² .

A packaging system is preferred according to the invention, the packaging system having a sealing strength at 500 kPa, 150° C. and 1 s of greater than or equal to 3.0 N/15mm, preferably a sealing strength of greater than or equal to 3.5 N/15mm, particularly preferably greater equal to 4.2 N/15mm.

A packaging system is preferred according to the invention, the packaging system having a migration value of mineral oil substances, in particular MOSH and MOAH, of at least less than 0.6 mg/kg, preferably at least less than 0.3 mg/kg, particularly preferably at least less than 0 .1mg/kg. The migration value is the amount (in mg) that migrates into one kg of food within 10 days at 40 °C.

According to the invention, preference is given to a packaging system in which the packaging system has a Bekk smoothness, determined according to ISO 5627, in the range from 100 to 1200 s on the second barrier layer. Contrary to ISO 5627, in this case the Bekk smoothness is not determined on both sides of the packaging system, but only on the second barrier layer of the packaging system.

A packaging system is preferred according to the invention, wherein the packaging system contains no fluorine-containing compounds, in particular no fluorinated organic compounds.

A further aspect of the present invention relates to the use of a packaging system according to the invention as packaging material, in particular for food (in particular convenience products), electronic products, agricultural products (e.g. seeds, fertilizers), animal feed, animal feed, washing powder, pharmaceutical products, building materials (e.g. cement, gypsum, paste powder), body care products or cosmetics.

Convenience products is a generic term for ready-made products or meals such as canned food, frozen food, microwave complete meals, baking mixes, instant puddings and instant soups. These products are often ready to eat or simply require further processing. Depending on the intended use and condition, finished products only have to be thawed and heated before consumption.

According to the invention, it is particularly preferred to use it for packaging dry, moist and/or frozen foods, such as baked goods, pre-baked rolls, baking ingredients, fruit, vegetables, roasted and/or deep-fried goods, snack goods, sandwiches, bread, burgers, rice, noodles, frozen foods -French fries, frozen creamy vegetables, breaded schnitzel, meat products, fish products, ready meals, baking mixes, mashed potatoes, instant soups, instant pasta dishes, sausage products, salad containers, salad bowls and/or cheese.

A further aspect of the present invention relates to packaging, in particular food packaging, comprising a packaging system according to the invention.

1. a) Reduzierung der Wasserdampfdurchlässigkeit nach DIN 53122-1 auf einen Wert von kleiner gleich 300 g/(m²d)
   und/oder
2. b) Reduzierung der Fettdurchlässigkeit mit Terpetinöl nach Tappi 454 auf einen Wert von mindestens 1300 s
   und/oder
3. c) Reduzierung des Migrationswerts von MOSH und MOAH auf kleiner als 0,6 mg/kg.

Another aspect of the present invention relates to the use of a packaging system according to the invention in packaging, preferably in food packaging, for

1. a) Reduction of water vapor permeability according to DIN 53122-1 to a value of less than or equal to 300 g/(m ² d)
   and or
2. b) Reduction of the fat permeability with turpetine oil according to Tappi 454 to a value of at least 1300 s
   and or
3. c) Reduction of the migration value of MOSH and MOAH to less than 0.6 mg/kg.

1. (i) Herstellen oder Bereitstellen einer Papierpulpe umfassen Aktivkohle,
2. (ii) Erzeugen einer Papierschicht aus der hergestellten oder bereitgestellten Papierpulpe,
3. (iii) optional Herstellen oder Bereitstellen eines Trägerpapiers,
4. (iv) Herstellen oder Bereitstellen eines ersten Barrierestrichs umfassend ein Bindemittel und ein Pigment
5. (v) Auftragen des hergestellten oder bereitgestellten ersten Barrierestrichs auf eine Seite des Papierträgers oder auf eine Seite der Papierschicht und anschließendes Trocknen des Barrierestrichs, sodass eine erste Barriereschicht resultiert
6. (vi) Herstellen oder Bereitstellen eines zweiten Barrierestrichs umfassend ein Acrylat-Copolymer und ein Wachs
   und
7. (vii) Auftragen des hergestellten oder bereitgestellten zweiten Barrierestrichs auf die in Schritt v hergestellte erste Barriereschicht und anschließendes Trocknen des zweiten Barrierestrichs, sodass eine zweite Barriereschicht resultiert.

A further aspect of the present invention relates to a method for producing a packaging system, preferably a packaging system according to the invention, comprising the following steps

1. (i) making or providing a paper pulp include activated carbon,
2. (ii) creating a paper layer from the produced or provided paper pulp,
3. (iii) optionally producing or providing a backing paper,
4. (iv) producing or providing a first barrier coating comprising a binder and a pigment
5. (v) Applying the prepared or provided first barrier coat to one side of the paper support or to one side of the paper layer and then drying the barrier coat, resulting in a first barrier layer
6. (vi) producing or providing a second barrier coat comprising an acrylate copolymer and a wax
   and
7. (vii) Application of the second barrier coating produced or provided to the first barrier coating produced in step v and subsequent drying of the second barrier coating, resulting in a second barrier coating.

A further aspect of the present invention relates to a packaging system produced by a method according to the invention.

Within the scope of the present invention, several of the aspects described above as preferred are preferably realized simultaneously; the combinations of such aspects and the corresponding features resulting from the appended claims are particularly preferred.

With regard to the coating composition used in a method according to the invention for producing a packaging system, reference is made here to the statements on the composition of the individual layers. The coating compositions are designed in such a way that the layers present in a packaging system according to the invention result therefrom. The coating compositions are usually in the form of an aqueous dispersion and contain the constituents or compounds (e.g. monomers or crosslinking agents) present in the individual layers, which react to form the constituents.

In addition, the coating compositions can also contain the additives commonly used in papermaking, such as biocides, dispersants, release agents, defoamers or thickeners, which are added to adjust the properties of the coating composition and in the from the Coating composition prepared layer usually remain. In this case, additives customarily used in papermaking can be used in the customary amounts.

To apply the coating composition to the base paper or a layer already present on the base paper (e.g. first barrier layer), the person skilled in the art knows various techniques which are referred to as brushing, for example: blade coating, coating with a film press, cast coating, curtain coating ("curtain coating "), squeegee painting, air knife painting or spray painting. All of these known, aforementioned painting techniques are suitable for applying the coating composition according to the invention to a backing paper, preferably a backing paper which comprises one or more precoats or intermediate coats or which also does not comprise any precoat or intermediate coat. According to the invention, preference is given to curtain coating ("curtain coating") or application by means of a roller blade (roller blade coating).

Further embodiments result from the exemplary embodiments explained in more detail in the figures and the example. In the figures show:
Figures 1 to 9 schematic of possible layer structures of packaging systems according to the invention.

figure 1 shows a packaging system 1 according to the invention, which consists of a first paper layer (2) comprising particulate activated carbon, a first barrier layer (4) and a second barrier layer (5). The paper layer (2) has a front side and a back side opposite the front side, and on the front side of the paper layer (2) there is a first barrier layer 4) which comprises or consists of a binder and a pigment. A second barrier layer (5), which comprises or consists of an acrylate copolymer and a wax, is arranged (5) on the first barrier layer (4). The three layers of the packaging system are connected to form a laminate.

figure 2 shows a packaging system 1 according to the invention, which consists of a first paper layer (2) comprising particulate activated carbon, a carrier paper (3), a first barrier layer (4) and a second barrier layer (5). The backing paper (3) has a front side and a back side opposite the front side, and a first barrier layer (4) is arranged on the front side of the backing paper (3). comprises or consists of a binder and a pigment. A second barrier layer (5), which comprises or consists of an acrylate copolymer and a wax, is arranged (5) on the first barrier layer (4). The three layers 3, 4 and 5 are connected to form a laminate which, together with the first paper layer (2), forms the packaging system (1) according to the invention. The first paper layer (2) and the laminated composite of layers 3, 4 and 5 are not connected to one another. The laminate composite of the layers 3, 4 and 5 can be an inner bag, for example, while the first paper layer forms an outer box, for example folding box board.

figure 3 shows a packaging system 1 according to the invention, which consists of a first paper layer (2) comprising particulate activated carbon, a second paper layer (2.1) comprising particulate activated carbon, a third paper layer (2.2) comprising particulate activated carbon, a carrier paper (3), a first barrier layer (4) and a second barrier layer (5). The backing paper (3) has a front side and a back side opposite the front side, and a first barrier layer (4), which comprises or consists of a binder and a pigment, is arranged on the front side of the backing paper (3). A second barrier layer (5), which comprises or consists of an acrylate copolymer and a wax, is arranged (5) on the first barrier layer (4). The three layers 3, 4 and 5 are connected to form a laminate which, together with the first paper layer (2), forms the packaging system (1) according to the invention. The first paper layer (2), the second paper layer (2.1) and the third paper layer (2.2) form a composite which, in the illustrated embodiment, is a laminate composite.

figure 4 equals to figure 3 with the exception that the composite of the first paper layer (2), second paper layer (2.1) and third paper layer (2.2) is not a laminate composite, but a single-ply corrugated cardboard, in which the first paper layer (2) is the outer cover , the second layer of paper (2.1) forms the flute, for example B flute, C flute, F flute, etc., and the third paper layer (2.2) forms the inner lining of the corrugated cardboard.

figure 5 shows the interconnected system figure 1 with the difference that an additional protective layer (6) is arranged on the outside of the first paper layer. The protective layer (6) contains no activated carbon.

figure 6 shows the interconnected system figure 5 with the difference that an additional layer (6.1) is arranged between the first barrier layer (4) and the first paper layer (2).

figure 7 shows the interconnected system figure 2 with the difference that an additional protective layer (6) is arranged on the outside of the first paper layer. The protective layer (6) contains no activated carbon.

figure 8 shows the interconnected system figure 7 with the difference that an additional protective layer (6.1) is arranged on the inside of the first paper layer. The protective layer (6.1) does not contain any activated carbon.

figure 9 shows the interconnected system figure 1 with the difference that on the back of the first paper layer an additional first barrier layer (4.1) consisting of or comprising a binder and a pigment, and on this additional first barrier layer (4.1) an additional second barrier layer (5.1) consisting of or comprising an acrylate copolymer and a wax.

Example:

A folding box board was produced from a paper layer that included particulate activated carbon. The manufacturing process for the production of the paper layer is in EP3175985A1 described. The folding box board has a basis weight of 180 g/m2.

A backing paper was also used, which was made from a 1:1 mixture of short-fiber and long-fiber pulp ground at 39°SR on a paper machine to produce a resin-sized paper web with a mass per unit area of 40 g/m ² became. The paper substrate produced was calendered at a line load of 80 kN/m and a temperature of 80.degree.

A first barrier coating, which was present as an aqueous dispersion, was applied to the produced carrier paper using an air knife, and this barrier coating was then dried using IR and air drying, resulting in a first barrier layer with a weight per unit area of 3 g/m ² . The composition of the first barrier coat (excluding water) is given in Table 1.

A second barrier coating, which was present as an aqueous dispersion, was applied to the first barrier layer produced using a volumetric doctor blade, and this barrier coating was then dried using IR and air drying, resulting in a second barrier layer with a basis weight of 4 g/m ² . The composition of the second barrier coat (excluding water) is given in Table 1.

A bag that fits into the folding carton was made from the laminate produced from carrier paper, first barrier layer and second barrier layer. The inner bag was then placed in the carton box.

The resulting packaging system showed exceptionally good resistance to grease and moisture. A migration of mineral oil or other organic substances through the packaging system or to the inner part of the inner bag could not be observed. Table 1: component trade name component mass fraction First barrier line (plus water): Polyacrylamide, anionically modified Sterocoll BL binder 0.01 to 0.10 aqueous polymer dispersion based on acrylic acid ester, carboxylic acids Sterocoll FS binder 1.0 to 2.5 anionic copolymer based on n-butyl acrylate, acrylonitrile and styrene Acronal S505 binder 65 to 75 kaolin Capim NP pigment 25 to 35 Second barrier line (plus water): Statistical acrylate copolymer made from methyl acrylate, butyl acrylate, 2-ethylhexyl acrylate and styrene as monomers in equal proportions by mass. acrylate copolymer barrier agent 70% octacosane octacosane wax 30%

Claims (15)

1. Packaging system (1), especially food packaging system, comprising or consisting of

   A) a first paper layer (2) comprising particulate activated carbon, having a face and a reverse opposite the face, where the paper layer consists of a mass fraction of not less than 50% of recycled fibres, based on the total mass of the fibres in the paper layer,

   B) a first barrier layer (4) disposed on the face and/or reverse of the paper layer (2) or on at least one side of a carrier paper (3) and consisting of or comprising a binder and a pigment, and

   C) a second barrier layer (5) disposed on the first barrier layer (4) and consisting of or comprising an acrylate copolymer and a wax.
2. Packaging system according to Claim 1, wherein the activated carbon has a mean particle diameter d50 in the range between 1 µm and 100 µm.
3. Packaging system according to either of the preceding claims, wherein two further layers (2.1, 2.2) joined to the first paper layer are provided, and preferably the first paper layer (2) with the two further paper layers (2.1, 2.2) is configured as a single-ply corrugated board.
4. Packaging system according to any of the preceding claims, wherein the wax in the second barrier layer is a wax composed of saturated hydrocarbons.
5. Packaging system according to Claim 4, wherein the wax based on saturated hydrocarbons comprises or consists of one, two, three or more than three alkanes selected from the group consisting of heneicosane, docosane, tricosane, tetracosane, pentacosane, hexacosane, heptacosane, octacosane, nonacosane, triacontane, hentriacontane, dotriacontane, tritriacontane, tetratriacontane, pentatriacontane, hexatriacontane, heptatriacontane, octatriacontane and nonatriacontane.
6. Packaging system according to any of the preceding claims, wherein the mass fraction of the wax in the second barrier layer (5) is 5 to 60%, preferably 15 to 50%, more preferably 20 to 40%, based on the total mass of the second barrier layer.
7. Packaging system according to any of the preceding claims, wherein the acrylate copolymer in the second barrier layer is a copolymer produced using two, three, four, five, six or all monomers selected from the group consisting of methyl acrylate, methyl methacrylate, butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate and styrene.
8. Packaging system according to any of the preceding claims, wherein the pigment in the first barrier layer is an organic pigment, an inorganic pigment or a mixture of organic pigment and inorganic pigment.
9. Packaging system according to any of the preceding claims, wherein the pigment in the first barrier layer is an inorganic pigment selected from the list consisting of calcined kaolin, kaolin, kaolinite, magnesium silicate hydrate, silicon oxide, bentonite, calcium carbonate, aluminium hydroxide, aluminium oxide and boehmite.
10. Packaging system according to any of the preceding claims, wherein the pigment in the first barrier layer is platelet-shaped in form.
11. Packaging system according to any of the preceding claims, wherein the mass fraction of the pigment in the first barrier layer is 5 to 60%, preferably 15 to 40%, more preferably 20 to 40%, based on the total mass of the first barrier layer.
12. Packaging system according to any of the preceding claims, wherein the binder in the first barrier layer is a copolymer produced using one, two, three or all monomers selected from the group consisting of butyl methacrylate, butyl acrylate, methacrylonitrile, acrylonitrile, α-methylstyrene and styrene.
13. Packaging system according to any of the preceding claims, wherein the carrier paper and/or the first paper layer is a paper having a mass per unit area in the range from 30 to 150 g/m², a card having a mass per unit area of more than 150 g/m² and less than 225 g/m² or a board having a mass per unit area of more than 225 g/m².
14. Use of a packaging system according to any of Claims 1 to 13 as packaging material, especially for foods (especially convenience products), electronic products, agricultural products (e.g. seed, fertilizer), animal feed, fodder, detergent powder, pharmaceutical products, building materials (e.g. cement, gypsum, powder paste), personal care products or cosmetics.
15. Method for producing a packaging system according to any of Claims 1 to 13, comprising:

    (i) producing or providing a paper pulp comprising activated carbon,

    (ii) generating a paper layer from the paper pulp produced or provided,

    (iii)optionally producing or providing a carrier paper,

    (iv) producing or providing a first barrier coating comprising a binder and a pigment,

    (v) applying the first barrier coating produced or provided to one side of the paper carrier or to one side of the paper layer and then drying the barrier coating, to give a first barrier layer,

    (vi) producing or providing a second barrier coating comprising an acrylate copolymer and a wax
    and

    (vii)applying the second barrier coating produced or provided to the first barrier layer produced in step (v) and then drying the second barrier coating, to give a second barrier layer.

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