EP3260597B1 - Multi-layer fibre product with an inhibited migration rate of aromatic or saturated hydrocarbons and method for producing the same - Google Patents

Description

The present invention relates to a process for the production of a multi-ply fiber product, in particular a foodstuff packaging, with a compared to recycled fibers based fiber products reduced migration behavior of aromatic hydrocarbons, in particular aromatic mineral oil hydrocarbons (MOAH) and / or saturated hydrocarbons, in particular saturated mineral oil hydrocarbons (MOSH ), in which two or more fibrous layers are produced from a pulp suspension. The inventive method is characterized in that in at least one fibrous layer of the fiber product, a mineral filter material selected from the group of bentonites and / or saponites is added. The pulp product of the present invention has an inhibited migration rate, i. the migration of MOAH and / or MOSH compounds from the pulp product (e.g., cardboard or paper) to the food is inhibited or completely prevented.

Food packaging often consists of cardboard or paper and thus of vegetable fibers. These fibers can be obtained mechanically or chemically from plants or as so-called "secondary fibers" from waste paper. The food comes into direct contact with the product packaging, which is particularly problematic if the food packaging contains mineral oils that can migrate into the food. These include, in particular, saturated mineral oil hydrocarbons (MOSH) and aromatic mineral oil hydrocarbons (MOAH). Even small amounts of these substances can lead to health problems in the consumption of foodstuffs, up to serious diseases such as cancer.

Particularly susceptible to the transfer of mineral oil components of recycled packaging are durable foods, such as pasta or rice. Particularly vulnerable are recycled fiber-containing and / or printed folding cartons or recycled corrugated cardboard. A major cause and authoritative source of mineral oil constituents in the food chain is the use of mineral oil containing newsprint inks Recycling cycle in food packaging from secondary fibers arrive. In addition, there are other entry paths of MOSH / MOAH in the manufacturing and processing process, for example due to the use of lubricants in primary production. However, the migration of MOAH and MOSH into foodstuffs to be packaged does not only occur in fiber products made from recycled fibers, but also in virgin fibers, which are stored or transported in recycled packaging.

In the case of hydrocarbons, food contamination is often due to outgassing of the packaging materials and deposition on the food surface. Although there are inner packaging made of polyethylene or polypropylene, however, their manufacture is just as complex as the use of other functional barriers, which are not migration-tight. Other functional barriers, such as the application of aluminum layers or polyethylene terephthalate (PET), are considered to be migration-tight. The disadvantage, however, is that the production of aluminum foil is cost and energy intensive and also negatively affects the recycling process. In addition, migration-proof packaging promotes the growth of microorganisms in food, which reduces their shelf life.

While short-chain MOSH and MOAH compounds generally do not pose a problem because they evaporate in the drying process of paper and board making, the long-chain compounds are very migratory and therefore remain permanently in the fiber product. However, there are also MOSH and MOAH, which do not evaporate due to the molecular weight in the drying process of paper or board production, but remain in the fiber product but are still capable of migration. For example, for secondary fibrous cartons having a gray backside with a volume of between 1.3 and 1.45 cm ³ / g contents of 50 to 500 ppm MOSH and / or MOAH can be detected. The extent to which migration of MOSH and MOAH compounds from the packaging to the food actually takes place depends on a large number of influencing factors. These include, for example, the packaging design, in particular the ratio of mass of the packaging to mass of the food, the starting content of MOSH and MOAH in the packaging material, the storage temperature, the storage life, the particle size or specific surface of the food to be packaged, the polarity of the food and the Presence of diffusion-tight intermediate packaging.

In order to prevent or at least reduce a possible transfer of aromatic hydrocarbons and / or saturated hydrocarbons to a food, has been described in the WO 2012/175309 A1 proposed the use of a filter layer of activated carbon for the packaging product described therein. For incorporation of activated carbon into the filter material, the migration value should be lowered to 0.6 mg / kg of food. However, the use of activated carbon as filter material has significant disadvantages. This includes, for example, the entry of deep black pigments in the manufacturing process and ultimately the final product. Furthermore, a blackening of the circulating waters within the production process by unretained, ie retained on the forming screen particles are observed. The black coloration of the pulp layer caused by the activated carbon is therefore undesirable, even if the layer is not visible from the outside. For example, when the cardboard is torn, fine carbon dust could be released, even if the filter material is part of an inner fibrous layer.

The migration value or rate indicates the amount (expressed in mg) that migrates within 10 days at a defined temperature (for example, from 40 ° or 60 ° C) to one kilogram of food. The determination of mineral oil levels in food is considered to be extremely demanding, as it is a complex mixture that must be quantified as the sum of all components. In most cases, gas chromatographic analyzes are used, but they give very broad signals. The simplest method for determining MOSH and MOAH involves the use of liquid chromatography gas chromatography flame ionization detection, LC-GC-FID (Federal Institute for Risk Assessment, BfR, determination of hydrocarbons from mineral oil (MOSH or MOAH) or plastics (POSH, PAO) in Packaging materials and dry foods by means of solid phase extraction and GC-FID, www.bfr.bund.de). An HPLC separation of MOSH and MOAH fractions can be carried out by means of normal phase chromatography, wherein the fractions are further separated by GC and detected with a FID. The content of mineral oil components correlates with the proportion of recycled fibers in the packaging carton, wherein cardboard packaging with a high mineral oil content does not necessarily lead to increased loads in the food. For example, barriers used in children's nutritional products (e.g., inner bags) may protect against migration of MOSH and MOAH into the food. Conspicuously high loads, however, can be detected, for example, in cereal bar, biscuit and biscuit packaging (F. Armellini, Institute for Environmental and Food Safety of the Province of Vorarlberg, Mineral Oil Components in Food (2012)).

In papermaking and paperboard production, microparticle systems are frequently used in which small amounts of bentonite are used to improve the mechanical, optical and printing properties of the fiber product. That's how it describes EP 0 235 893 B2 a manufacturing process for paper or paperboard by forming a aqueous cellulose suspension containing after dewatering an organic polymer material and bentonite to inorganic material. There is an addition of bentonite in an amount of 0.03 to 0.5 wt .-%, based on the dry weight of the suspension. The aim here is to improve the retention of fibrous materials in order to ultimately accelerate the dewatering of pulp suspensions. The retention of fillers in papermaking and board making is also part of the process of US 3,052,595 B. In this case, 1 to 20 wt .-% bentonite are used, to the suspension additionally an acrylamide polymer is added. The filler retention is due to the activity of the acrylamide polymer and is enhanced by the addition of a small amount of bentonite.

The improvement of the drainage and retention properties through the use of bentonite is also part of the EP 0 017 353 B2 , where in addition to a polymer bentonite with a proportion of between 0.02 to 2% based on the dry weight of the suspension is used. Similar approaches also describe the DE 10 2011 001 617 A1 . DE 35 41 163 A1 and DE 695 34 985 T2 ,

The WO 2014/108844 is another example where a retention system is used to make a multi-ply paper or paperboard product using bentonite at a dosage of 2.4 kg / t based on dry weight. Again, a polyvinylamine is used. The aim of this system is to improve retention without increasing drainage. This should decouple retention and drainage.

A similar procedure also describes the WO 2008/052970 A1 for producing a multilayer fibrous web of cellulosic fibers. In this case, a retention agent is used which belongs to the group of polyacrylamides, polymethacrylamides, polymers containing vinylamine units and / or the microparticle system. Suitable inorganic components of the microparticle system are, for example, bentonite, colloidal silicic acid, silicates and / or calcium carbonate. Depending on the type and activation, the bentonite has a specific surface area of 60 to 800 m ² / g. In the papermaking process, the bentonite is added to the cellulosic suspension, typically in the form of an aqueous bentonite slurry. This bentonite slurry may contain up to 10% by weight of bentonite. The addition of the retention agent takes place in the paper production process before shearing of the paper stock, between two shear stages or after the last shearing of the paper stock. The addition of retention aids and / or dewatering agents to the paper stock is preferably carried out under turbulent flow of the aqueous formulations of the process chemicals. Again, the goal of retention, paper webs with to obtain an improved formation, especially in multi-layer fibrous webs.

Bentonite is also used in the production of a dashed paper, as described for example in US Pat EP 2 395 148 A1 , It mentions bentonite as the main constituent of the coating material, the application medium or the coating color. This should improve the surface finish and also the printability of the papers.

Bentonite is also used for impurity binding or Störstoffmaskierung. For example, describes the EP 0 760 406 A2 a method for masking dye particles in papermaking by retention of adherent particles on the cellulose fibers. The use of bentonite for impurity binding is also part of the DE 10 2005 039 850 A1 as well as the DE 10 2004 060 587 A1 , Bentonite is added to the paper pulp or fiber pulp in order to achieve bonding of the impurities to the bentonite. By adding bentonite, adhesive substances are so wetted that they are no longer sticky and no longer tend to adhere to process machines (contaminant masking). Other impurities are in turn bound due to their polarity to the fibers and thereby disposed of with the paper web from the process (impurity binding). The microparticle systems known in the state of the art thereby only bring about an improvement in the retention and discharge of contaminants, but not in connection with avoiding the reduction of mineral oil constituents in a finished pulp product, for example a food carton. The use of bentonite in a finished fiber product for migration inhibition of MOAH and / or MOSH in a food has not been described in the prior art.

Thus, the WO 2012/175309 A1 with respect to the problem underlying this invention, namely the reduction of the migration behavior of MOAH compounds and MOSH compounds, the closest prior art. For migration inhibition is proposed therein to use activated carbon in a fibrous layer of a fiber product. However, the associated side effects (see above) should be avoided.

Against this background, it is an object of the present invention to provide an alternative method for producing a multi-ply fiber product, which has a compared to recycled fiber-based fiber products reduced migration behavior of mineral oil-containing hydrocarbons.

This object is achieved by a method having the features of claim 1 and a migration-inhibiting fibrous product having the features of claim 10. Preferred embodiments can be found in the subclaims again.

The inventive method is directed to the production of a migration-inhibiting multilayer fiber product, in particular a food packaging, with respect to a recycling fiber-based fiber product reduced migration behavior of aromatic hydrocarbons, especially aromatic mineral oil hydrocarbons (MOAH) and / or saturated hydrocarbons, in particular saturated mineral oil hydrocarbons (MOSH), in which two or more fiber layers are produced from a pulp suspension. According to the invention it is provided that in at least one fibrous layer, a mineral filter material selected from the group of bentonites and / or saponites is added.

Preferably, a filter material based on a modified bentonite component is used. The mineral filter material can be registered in different ways in the fiber product or applied to the fiber product. In a first variant it is provided that the mineral filter material, ie either a bentonite and / or saponite, the pulp suspension is added before the formation of the pulp layers. Preferably, depending on the particular individual layer of the fibrous product (eg folding carton) 3 to 25 wt .-% filter material, based on the oven-dry pulp, the pulp suspension is added. Preferably, the mineral filter material is added as a dry product or as a pigment suspension, preferably with a solids content of 3 to 40 wt .-%, preferably between 3 to 25 wt .-%, added. In a preferred variant, at least 20% by weight of mineral filter material, based on the dry weight, are admixed. Preferably, not more than 25% by weight, preferably not more than 40% by weight, of mineral filter material, ie bentonite and / or saponite, is added to the fibrous layer or introduced into the fibrous product. The entry of the mineral filter material can take place in one or more fibrous layers. In this case, the dosage may be different in the individual or in all layers of the fiber product. An intermediate layer denotes an additional layer which is inserted during the production process and which is arranged between two fibrous layers of the fibrous product and which comprises mineral filter material. Preferably, the mineral filter material is incorporated into one or more fibrous layers or into a single intermediate layer facing the food to be packaged of the finished product package. The addition of the mineral filter material according to the invention into the food-attracted fibrous layer has proven to be the most effective Method for reducing the migration behavior of mineral oil hydrocarbons (MOAH) and / or saturated mineral oil hydrocarbons (MOSH). Typically, food-grade sheet is the cardboard backside of a carton box. The entry of the mineral filter material is therefore preferably in a fibrous layer, which faces the food to be packaged, while other fibrous layers of the fibrous products do not contain the mineral filter material. It is preferably provided that at least one fibrous layer of the fibrous product contains no mineral filter material or only in such amounts as are present anyway during the production process (for example for the removal of contaminants).

For concentrating the mineral filter material in the fiber structure of the fibrous layer preferably a polyacrylamide, a polyethyleneimine or a polyvinylamine are added to the pulp suspension in addition. Preferably, polyacrylamide is added at a weight fraction of 0.005 to 0.05% and / or a polyethyleneimine and / or a polyvinylamine, in each case preferably with a weight fraction of 0.025 to 0.2%. Also advantageous is a combination of 50 to 500 ppm of polyacrylamide, based on the oven-dry amount of solids, in combination with 250 to 2000 ppm polyethyleneimine or polyvinylamine, based on the oven-dry amount of solids, proved to be advantageous.

The addition of the mineral filter material in the pulp suspension can be done between each process stage of pulp processing or within the constant part of a paper or board machine. It must be ensured that a sufficient concentration of the filter material is present in the finished fiber product so that the migration value for MOSH is less than 2 mg / kg of food and / or the migration value for MOAH is less than 0.5 mg / kg of food.

Dosing in the constant part of the paper or board machine or in front of the sheet-forming zone has proved to be particularly advantageous since the loss of filter pigments at the metering points is the lowest in this case.

In a further variant it is provided that the mineral filter material is metered between the individual fiber layers of the multilayer fiber product. For this purpose, the mineral filter material is preferably sprayed into the sheet-forming zone of the at least one fibrous layer. This preferably takes place with the aid of a spray tube of the sheet-forming zone of the paper or board machine, preferably bentonite and / or saponite suspensions having a solids content of from 3 to 40% being used. To the pulp suspension is sprayed between the individual layers before Vergautschung. In a preferred variant of this method, cone jet nozzles are used, which enable a homogeneous distribution of the mineral filter material over the transverse profile of the fiber product.

In a further variant it is provided that the mineral filter material is applied directly to the surface of the at least one fibrous layer of the fiber product. This can be done for example as an application in the form of a coating color. In this variant, the mineral filter material is present as a coating color pigment, with pigment fractions of 20 to 60% have proved advantageous, since these are easier to handle due to their rheological properties. For binding the filter pigments, it is also possible to use starch or polymer dispersions. Binder proportions of between 10 and 20%, based on the oven-dried pigment, are preferably used. The filter material may be applied as a "coating color" to a food-facing side of the fiber product by means of a roller blade, a doctor blade, an air brush or a curtain coater, i. the cardboard or paper.

Of course, it is possible that one or more of these process variants are used and that the entry or application types can be combined with each other in any form. It is crucial that sufficient amounts of the filter material are present in or on the fibrous structure in order to reduce or prevent migration of MOAH and / or MOSH from the packaging into the food to be packaged.

The present invention also relates to a migration-inhibiting multilayer fiber product produced by the process according to the invention, in particular a food packaging, having a reduced migration behavior of aromatic hydrocarbons, in particular aromatic mineral oil hydrocarbons (MOAH) and / or saturated hydrocarbons, for a fibrous product to be packaged against recycled fiber-based fiber products , in particular saturated mineral oil hydrocarbons (MOSH), wherein the fiber product consists of two or more fibrous layers. The fibrous product according to the invention is characterized in that at least one fibrous layer of the multilayer fibrous product comprises a mineral filter material selected from the group of bentonites and / or saponites. The entry or application of the mineral filter material preferably takes place at the food-attracting fibrous layer of the fibrous product, ie at the inside of the foodstuff packaging. In another Variant is provided that an intermediate layer, which comprises the mineral material according to the invention, is disposed between two fibrous layers of the manufacturing process. Preferably, the fibrous layer of the multi-ply fiber product contains mineral filter material with a migration value for MOSH less than 2 mg / kg of food and / or a migration value for MOAH less than 0.5 mg / kg of food. In a preferred variant, the migration inhibition is so strong that the migration value for MOSH is less than 1 mg / kg of food and / or the migration value for MOAH is less than 0.25 mg / kg of food. The mineral filter material is preferably present in the fibrous layer at a weight fraction of from 3 to 40% by weight. The use of a modified montmorillonite as bentonite has proved to be particularly advantageous for the migration behavior. A variant of the fiber product according to the invention provides that the mineral filter material is contained in at least one, preferably several fibrous layers. The invention further relates to the use of such a multilayer fiber product, in particular a food package, for reducing the migration of aromatic hydrocarbons, in particular aromatic mineral oil hydrocarbons (MOAH) and / or saturated hydrocarbons, in particular saturated mineral oil hydrocarbons (MOSH), in a to be packaged Foods.

The entry or application of the mineral filter material on the food-facing side offers significant advantages, since the material is fully recyclable and the introduction of the filter material is parallel to the production of the paper or cardboard. As a result, no further value creation step is required.

When using bentonite and / or saponite, as compared to a filter layer of activated carbon, there is no entry of deep black pigments during the production process, which ultimately end up in the finished product. As a result, the typical presentation of a recycled cardboard and its color will remain even at high mixing ratios of bentonite and / or saponite. Also, blackening of circulating waters within the papermaking process is avoided by unretained (i.e., not retained on the forming screen) particles. In addition, observed when using bentonite and / or saponite an advantageous interaction with retention aids, such as polyacrylamide, which leads to an increase in the fine and filler retention.

The invention will be explained in more detail in the following embodiments. One embodiment variant provides for a four-ply cardboard in which the mineral filter material is applied or registered in one or more fibrous layers. Typically, such a box consists of an insert, a back with a backsize, a protective layer and a cover layer with top coat. In a three-ply cardboard, the protective layer is missing, so that it consists of a cover layer with top coat, an insert and a back with backside stroke. The mineral filter material can thus be located in the fiber structure of the insert or the back. In one variant, the reverse side coat of the back can also be provided with a coating pigment which contains a bentonite and / or saponite. Alternatively, the filter material according to the invention can also be integrated between the insert and the back in the fiber structure.

In one embodiment, two layers of a four-ply paperboard were spiked with a modified montmorillonite-based bentonite. Depending on the individual layer, 5 to 15% of bentonite, based on the oven-dry fiber mass, was added to the pulp suspension. The migration behavior was analyzed analytically. In this case, the cardboard with the filter material and a standard quality without filter material was compared with respect to the migration of MOAH. The migration was tested on the basis of a test food substitute (modified polyphenylene oxide MPPO, Tenax®) after 10 days at a temperature of 60 °

It was found that at comparable MOAH contents of about 60 to 85 ppm, based on the paperboard composition, no migration of MOAH C16-C35 was detectable in the case of the pattern offset with the filter material. The analysis was based on a detection limit of 0.01 mg / dm ² . In the standard quality, in turn, a migration between 0.14 and 0.15 mg / dm ^{2 was} found. The aim should be a migration limit of 0.5 mg MOAH / kg food or less than 2 mg MOSH per kg food.

The result of the investigation is in Fig. 1 shown. It can be clearly seen that the MOAH migration (C16-C35) in the filter cardboard samples according to the invention could be reduced almost completely in comparison to conventional folding boxboard. The migration limit is determined on the basis of an EU cube model describing a cube-shaped package with an edge length of 1 dm filled with 1 kg of food. As a result, according to this model, 6 dm ^{2 of} packaging material faces one kg of food.

In Fig. 2 a simplified process schematic is shown to show preferred metering points for introducing the mineral filter material of the present invention into the pulp layer in the area of the constant part of a papermaking machine. The The introduction of the mineral filter material therefore preferably takes place in front of the machine chest, before the use of white water, before the headbox pump is pressurized, before the pressure sorter or in front of the headbox. Of course, one or more combinations of these metering points for the filter material in the process flow are possible.

Fig. 3 shows a variant of a multi-ply fiber product 1 in the form of a carton in cross section. The fibrous product 1 comprises a cover layer 3 with an outer cover coat 2, a protective layer 4, an insert 5 and a back 6 with an adjoining backsheet 7. The fibrous product 1 comprises the cover layer 3, the protective layer 4, the insert 5 and / or the back 6 one or more fibrous layers. The back 6 of the fiber product 1 is usually the food-facing fibrous layer and is mixed with a mineral filter material 9 (bentonite) in migration-inhibiting concentrations for MOAH and / or MOSH. The bentonite compound is preferably present with a MOAH and MOSH weight content of 3 to 40 wt .-% in the fibrous layer of the back 6. Additionally or alternatively, a further fibrous layer, preferably the insert 5, be offset with a filter material 9 in this concentration range, while the remaining fibrous layers contain no or possibly production-related concentrations (eg due to the removal of impurities) of bentonite as a mineral filter material 9.

Fig. 4 shows a further variant of a fibrous product 1 (cardboard) in cross-section, which comprises a cover layer 3 with a top coat 2, a protective layer 4, an insert 5 and a back 6 with a backsheet 7. In addition to the back 6 contains in this embodiment, the backside line 7 a mineral filter material 9. Alternatively, only the backsheet 7 may be offset with a mineral filter material 9.

Fig. 5 shows a further variant of a fibrous product 1 (cardboard) in cross-section, which also has a cover layer 3 with a top coat 2, a protective layer 4, an insert 5 and a back 6 with a backsheet 7. The back 6 is offset in this embodiment with a mineral filter material 9. In addition, a mineral filter material 9 is integrated as an intermediate layer 8 between the insert 5 and the back 6 in the fiber structure. The intermediate layer 8 is preferably located to the food-facing side of the fiber product 1 between two adjacent pulp layers. In a variant it is provided that only the intermediate layer 8 contains the mineral filter material (eg bentonite and / or saponite) in migration-inhibiting concentrations, but not the fibrous layers 3, 4, 5, 6. In the shown Variant, the mineral filter material 9 consists of a montmorillonite with a concentration of about 25 wt .-%.

The multi-layer migration-resistant fiber-fabric product according to the invention leads to a significant reduction or even complete reduction of the migration value for MOAH and MOSH under the limit values which are to be evaluated as safe from a health point of view. Thus, the fiber product according to the invention is particularly suitable as food packaging, since hazardous mineral oil-containing hydrocarbons and their evaporation are prevented on or in the food by preventing the migration.

Claims (15)

1. Method for producing a multi-layer fibrous material product (1), in particular a foodstuff packaging, having reduced migration of aromatic hydrocarbons, in particular mineral oil aromatic hydrocarbons (MOAH) and/or saturated hydrocarbons, in particular mineral oil saturated hydrocarbons (MOSH), in comparison with fibrous material products based on recycled fibres, in which method two or more fibrous material layers (3, 4, 5, 6) are produced from a fibrous material suspension, characterised in that a mineral filter material (9) selected from the group of bentonite and/or saponite is added to at least one fibrous material layer (3, 4, 5, 6) or to an intermediate layer (8) arranged between two fibrous material layers (3, 4, 5, 6), the dose of the mineral filter material (9) in the relevant fibrous material layer (3, 4, 5, 6) being measured such that the migration value for MOSH is less than 2 mg per kg of foodstuff and/or the migration value for MOAH is less than 0.5 mg per kg of foodstuff.
2. Method according to claim 1, characterised in that the mineral filter material (9) is added to the fibrous material suspension before the fibrous material layers (3, 4, 5, 6) are formed.
3. Method according to either claim 1 or claim 2, characterised in that the mineral filter material (9) is added to the fibrous material suspension as a dry product or as a pigment suspension, preferably having a solids content of from 3 to 40 wt.%, preferably of from 3 to 25 wt.%.
4. Method according to any of claims 1 to 3, characterised in that the mineral filter material (9) is sprayed in the sheet-forming region of the at least one fibrous material layer (3, 4, 5, 6).
5. Method according to any of claims 1 to 4, characterised in that the mineral filter material (9) is applied to the surface of the at least one fibrous material layer (3, 4, 5, 6).
6. Method according to claim 5, characterised in that the mineral filter material (9) is applied to the fibrous material layer (3, 4, 5, 6) as a coating colour pigment, preferably having a pigment content of from 20 to 60 wt.%.
7. Method according to any of claims 1 to 6, characterised in that the mineral filter material (9) is added to or applied onto a fibrous material layer (6, 7) of a foodstuff packaging that faces the foodstuff.
8. Method according to any of claims 1 to 7, characterised in that, in addition to the mineral filter material (9), a polyacrylamide, preferably in a percentage by weight of from 0.005 to 0.05%, and/or a polyethyleneimine and/or a polyvinylamine, each in a percentage by weight of from 0.025 to 0.2%, are added.
9. Method according to any of claims 1 to 8, characterised in that the dose of mineral filter material (9) in the relevant fibrous material layer (3, 4, 5, 6) is measured such that the migration value for MOSH is less than 1 mg per kg of foodstuff and/or the migration value for MOAH is less than 0.25 mg per kg of foodstuff.
10. Multi-layer fibrous material product (1), in particular foodstuff packaging, having reduced migration of aromatic hydrocarbons, in particular mineral oil aromatic hydrocarbons (MOAH) and/or saturated hydrocarbons, in particular mineral oil saturated hydrocarbons (MOSH), for a foodstuff to be packaged in comparison with fibrous material products based on recycled fibres, the fibrous material product consisting of two or more fibrous material layers (3, 4, 5, 6), characterised in that at least one fibrous material layer (3, 4, 5, 6) or an intermediate layer (8) of the multi-layer fibrous material product (1) arranged between two fibrous material layers (3, 4, 5, 6) comprises a mineral filter material (9) selected from the group of bentonite and/or saponite, the dose of the mineral filter material (9) in the relevant fibrous material layer (3, 4, 5, 6) being measured such that the migration value for MOSH is less than 2 mg per kg of foodstuff and/or the migration value for MOAH is less than 0.5 mg per kg of foodstuff.
11. Fibrous material product (1) according to claim 10, characterised in that the mineral filter material (9) is present in the fibrous material layer (3, 4, 5, 6) in a percentage by weight of from 3 to 40 wt.%.
12. Fibrous material product (1) according to either claim 10 or claim 11, characterised in that the bentonite in the mineral filter material (9) is a modified montmorillonite.
13. Fibrous material product (1) according to any of claims 10 to 12, characterised in that the mineral filter material (9) is contained in at least one fibrous material layer (3, 4, 5, 6) in concentrations that inhibit the migration of MOAH and/or MOSH, such that the migration value for MOSH is less than 2 mg per kg of foodstuff and/or the migration value for MOAH is less than 0.5 mg per kg of foodstuff.
14. Fibrous material product (1) according to any of claims 10 to 13, characterised in that the mineral filter material (9) is applied to the surface of the underside of a fibrous material layer (6) in the form of an underside coating (7) in concentrations that inhibit the migration of MOAH and/or MOSH, such that the migration value for MOSH is less than 2 mg per kg of foodstuff and/or the migration value for MOAH is less than 0.5 mg per kg of foodstuff.
15. Use of a multi-layer fibrous material product (1), in particular a foodstuff packaging, according to any of claims 10 to 14, for reducing the migration of aromatic hydrocarbons, in particular mineral oil aromatic hydrocarbons (MOAH) and/or saturated hydrocarbons, in particular mineral oil saturated hydrocarbons (MOSH), into a foodstuff to be packaged.

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