Method for producing a wax-free twist-wrap paper

Abstract

The invention relates to a method for producing a twist-wrap paper, in which method a first barrier coating composition is applied to one side of a twist-wrap base paper, wherein the first barrier coating composition contains: water and film-forming starch in an amount of at least 65.0% and at most 85.0%; binder in an amount of at least 10.0% and at most 30.0%; and cross-linking agent in an amount of at least 1.0% and at most 5.0%. A second barrier coating composition is applied to the dried first barrier coating composition, wherein the second barrier coating composition comprises: water and film-forming starch in an amount of at least 75.0% and at most 95.0%; binder in an amount of at least 1.0% and at most 5.0%; and kaolin in an amount of at least 4.0% and at most 15.0%. In the dried state, the mass of the first barrier coating composition remaining on the twist-wrap base paper is at least 0.5 g / m2 and at most 3.0 g / m2, and the remaining mass of the second barrier coating composition is at least 1.0 g / m2 and at most 5.0 g / m2, and the finished twist-wrap paper has a weight per unit area of at least 20 g / m2 and at most 65 g / m2, wherein less than 1.0% of the mass of the twist-wrap paper is formed by a wax coating.

Description

[0001] MANUFACTURING METHOD

[0002] A wax-free twist-wrap paper

[0003] FIELD OF THE INVENTION

[0004] The invention relates to a method for producing a twist-wrap paper used for packaging confectionery, which achieves the barrier effect required for such papers even though it is not coated with wax. Furthermore, the invention relates to such a twist-wrap paper.

[0005] BACKGROUND AND STATE OF THE ART

[0006] Twist-wrap papers are papers typically used to package certain food products, especially sweets such as chocolates or confectionery. To package these foods, the food is wrapped in the twist-wrap paper, and the protruding ends of the twist-wrap paper are twisted together to create a sealed package.

[0007] In addition to the mechanical requirements resulting from the industrial processing of twist-wrap papers, the barrier effect against the penetration of grease plays a major role. Furthermore, the packaged food must remain fresh and not stick to the twist-wrap paper.

[0008] These requirements are met in the prior art by a wax coating. Such a twist-wrap paper is described, for example, in EP 2 940 211. However, the use of waxes, particularly mineral oil-based waxes, has ecological disadvantages and entails difficulties in the recycling of twist-wrap papers. Therefore, there is interest in having twist-wrap paper available that does not contain a wax coating but still meets the requirements associated with the application.

[0009] SUMMARY OF THE INVENTION

[0010] The present invention is based on the object of providing a process for producing a twist-wrap paper such that the twist-wrap paper produced by a process according to the invention can be processed industrially, has a good barrier effect and essentially comprises no wax coating.

[0011] This object is achieved by a method for producing a twist-wrap paper according to claim 1 and by a twist-wrap paper according to claim 33. Advantageous further developments are specified in the dependent claims.

[0012] The process according to the invention for producing a twist-wrap paper comprises the following steps AE.

[0013] A - Providing a twist wrap base paper

[0014] B - applying a first barrier coating composition to one side of the twist-wrap base paper, comprising water and film-forming starch in an amount of at least 65.0% and at most 85.0%, binder in an amount of at least 10.0% and at most 30.0%, and crosslinking agent in an amount of at least 1.0% and at most 5.0%, wherein the percentages refer to the mass of solids in the first barrier coating composition,

[0015] C - Drying the first barrier coating composition,

[0016] D - applying a second barrier coating composition to the dried first barrier coating composition from step C, comprising water and film-forming starch in an amount of at least 75.0% and at most 95.0%, binder in an amount of at least 1.0% and at most 5.0%, and kaolin in an amount of at least 4.0% and at most 15.0%, wherein the

[0017] Percentages refer to the mass of solids in the second barrier coating composition,

[0018] E - drying the second barrier coating composition, wherein after drying in step E the mass of the first barrier coating composition remaining on the twist-wrap base paper, based on the area to which the first barrier coating composition was applied in step B, is at least 0.5 g / m 2 and a maximum of 3.0 g / m 2 and after drying in step E, the mass of the second barrier coating composition remaining on the twist-wrap base paper, based on the area to which the second barrier coating composition was applied in step D, is at least 1.0 g / m 2 and a maximum of 5.0 g / m 2 and wherein the twist wrap paper after step E has a basis weight of at least 20 g / m 2 and a maximum of 65 g / m 2and wherein less than 1.0% of the mass of the twist-wrap paper is formed by a wax coating. The first barrier coating composition forms a first barrier coating after drying in step C. The second barrier coating composition forms a second barrier coating after drying in step E. The first and second barrier coatings, regardless of any further intermediate layers, together form a layer with a high barrier effect against the penetration of fats, which is referred to below as the "barrier layer".

[0019] The inventors have surprisingly found that this process achieves a good barrier effect, the properties of the twist-wrap paper according to the invention are favorable for industrial processing, and that wax coating can largely be dispensed with. This effect is surprising because, on the one hand, according to the experience of the skilled person, waxes are generally required for coating twist-wrap papers in order to achieve the necessary barrier properties, and, on the other hand, because the skilled person would assume, due to the high proportion of film-forming starch in the two barrier coating compositions, that the barrier layer is too brittle to be suitable for the large deformations during twist wrapping.

[0020] The barrier layer of the twist-wrap paper according to the invention primarily serves as a barrier, particularly against the penetration of grease. Upon application of the first barrier coating composition, the film-forming starch is crosslinked by the crosslinking agent, thus creating a dense film on the twist-wrap base paper as a first barrier coating. This first barrier coating prevents the second barrier coating composition from penetrating deeply into the first barrier coating or the twist-wrap base paper, so that the second barrier coating composition remains on the surface and forms a second barrier coating there.

[0021] The second barrier coating composition comprises kaolin and a binder. The binder of the second barrier coating composition serves to anchor the kaolin in the second barrier coating. The kaolin primarily forms a barrier against the penetration of grease, and it is essential for the invention that the kaolin is located primarily in the second barrier coating and thus further away from the twist-wrap base paper in the thickness direction. In this way, the kaolin forms a very good external barrier against the penetration of grease, eliminating the need for waxes.According to the inventors' findings, it is essential that, based on the entire barrier layer formed by the first and second barrier coatings, the concentration of kaolin is higher in areas farther from the twist-wrap base paper than in the areas closer to the surface of the twist-wrap base paper. This is ensured by the sequential application of the first barrier coating composition in step B, the drying of the first barrier coating composition in step C, and the application of the second barrier coating composition to the first barrier coating in step D, as well as the specific composition of the first barrier coating composition, in particular the presence of the crosslinking agent.

[0022] The twist-wrap paper contains only a small amount of wax, and ideally, no wax coating at all. This makes it easily recyclable and eliminates the need for mineral oil-based components. This results in the ecological advantages of the inventive process for producing twist-wrap paper.

[0023] The twist-wrap base paper in step A has a first and a second side. Depending on the manufacturing process of the twist-wrap base paper, the properties of the two sides of the twist-wrap base paper may differ. In particular, when the twist-wrap base paper is produced on a paper machine, for example a Fourdrinier paper machine, it has a side referred to by those skilled in the art as the wire side and a side referred to by those skilled in the art as the top side. Preferably, the first and second barrier coating compositions are applied to the top side of the twist-wrap base paper.

[0024] The twist-wrap base paper in step A has a machine direction and a cross direction. The machine direction is the direction in which the web of the twist-wrap base paper runs through the machine during production. The cross direction is the orthogonal direction in the web plane of the twist-wrap base paper. The properties of the twist-wrap base paper, especially the mechanical properties, can differ in the machine direction and the cross direction.

[0025] In principle, any state-of-the-art twist-wrap base paper suitable for processing into a twist-wrap paper can be used as the twist-wrap base paper in step A. A high equilibrium moisture content and a high elongation at break in the transverse direction of the twist-wrap base paper are particularly important to enable wrapping and twisting. An example of a suitable twist-wrap base paper is the twist-wrap base paper generally available under product number 10003051 from delfortgroup AG, Traun, Austria.

[0026] The twist-wrap base paper in step A preferably comprises pulp fibers, wherein the pulp fibers are obtained from softwoods, such as spruce, pine, or fir; from hardwoods, such as birch, beech, or eucalyptus; or from other plants, such as hemp, flax, jute, ramie, kenaf, kapok, coconut, abaca, sisal, bamboo, cotton, or esparto grass. Particularly preferably, the pulp fibers are a mixture of pulp fibers from various of these sources.

[0027] The twist-wrap base paper in step A may contain fillers or pigments. Preferably, the total mass of fillers and pigments does not exceed 15.0% of the twist-wrap base paper mass, and more preferably, does not exceed 10.0% of the twist-wrap base paper mass.

[0028] Fillers and pigments that can preferably be used in twist-wrap base paper are calcium carbonate, magnesium carbonate, magnesium hydroxide, magnesium oxide, kaolin, titanium dioxide or mixtures thereof.

[0029] Preferably, the provision of the twist wrap base paper in step A comprises producing the twist wrap base paper in a paper machine, particularly preferably a Fourdrinier paper machine.

[0030] Preferably, the first barrier coating composition in step B is applied in a film press of a paper machine, a bar coater, a curtain coater, a jet coater or a printing device.

[0031] Preferably, the first barrier coating composition in step B is applied to at least 70%, more preferably to at least 90% of the area of ​​one side of the twist wrap base paper.

[0032] Preferably, drying in step C is carried out by contact with a heated surface, by contact with hot air, by infrared radiation or by microwave radiation.

[0033] Preferably, the second barrier coating composition is applied in step D in a film press of a paper machine, a bar coater, a curtain coater, a jet coater or a printing device.

[0034] Preferably, the second barrier coating composition is applied in step D to at least 70%, particularly preferably to at least 90%, of the area of ​​one side of the twist-wrap base paper such that it is applied at least partially, but not necessarily directly, to the first barrier coating. In a preferred embodiment of the process according to the invention, exactly two barrier coating compositions are applied, with the two barrier coating compositions particularly preferably being applied directly to one another—with drying in step C as an intermediate step. This means, for example, that particularly preferably no further coating compositions are applied between the first and second barrier coating compositions.

[0035] Preferably, drying in step E is carried out by contact with a heated surface, by contact with hot air, by infrared radiation or by microwave radiation.

[0036] Preferably, the first barrier coating composition comprises the film-forming starch in an amount of at least 67.0% and at most 83.0%, and more preferably in an amount of at least 70.0% and at most 80.0%, wherein the percentages are based on the mass of solids in the first barrier coating composition.

[0037] The film-forming starch in both the first and second barrier coating compositions can be selected by the skilled person from those film-forming starches known to him from the prior art for creating a barrier against fats and oils. The film-forming starch can be a mixture of different film-forming starches and can be the same or different in the two barrier coating compositions.

[0038] Preferably, the first barrier coating composition comprises the binder in an amount of at least 12.0% and at most 28.0%, and more preferably in an amount of at least 15.0% and at most 25.0%, wherein the percentages refer to the mass of solids in the first barrier coating composition.

[0039] The binder in both the first and second barrier coating compositions is or preferably comprises a styrene-butadiene copolymer, a styrene-acrylate copolymer, or a mixture thereof, and particularly preferably a styrene-1,3-butadiene latex. The binder may also be a mixture of different polymers and may be the same or different in the two barrier coating compositions.

[0040] Preferably, the first barrier coating composition comprises the crosslinking agent in an amount of at least 1.5% and at most 4.5%, and more preferably in an amount of at least 2.0% and at most 4.0%, wherein the percentages are based on the mass of solids in the first barrier coating composition.

[0041] The crosslinking agent is preferably or comprises glyoxal or potassium zirconium carbonate. Preferably, the first barrier coating composition has a solids content of at least 5.0% and at most 15.0%, particularly preferably at least 8.0% and at most 13.0%, based in each case on the mass of the first barrier coating composition.

[0042] Preferably, the first barrier coating composition has a pH of at least 8 and at most 10. Preferably, the pH is adjusted by adding sodium hydroxide to the first barrier coating composition.

[0043] Preferably, the second barrier coating composition comprises the film-forming starch in an amount of at least 78.0% and at most 92.0%, more preferably at least 83.0% and at most 90.0%, wherein the percentages refer to the mass of solids in the second barrier coating composition.

[0044] Preferably, the second barrier coating composition comprises the binder in an amount of at least 1.5% and at most 4.5%, more preferably at least 2.0% and at most 4.0%, wherein the percentages relate to the mass of solids in the second barrier coating composition.

[0045] Preferably, the second barrier coating composition comprises the kaolin in an amount of at least 6.0% and at most 13.0%, more preferably at least 7.0% and at most 11.0%, wherein the percentages refer to the mass of solids in the second barrier coating composition.

[0046] The kaolin is preferably in the form of small particles and has a particle size distribution such that 90% of the total particle volume is formed by particles having a size (D 90) of less than 3.0 pm, more preferably less than 2.5 pm and most preferably less than 2.0 pm.

[0047] Preferably, the second barrier coating composition has a solids content of at least 10.0% and at most 20.0%, particularly preferably at least 12.0% and at most 18.0%, in each case based on the mass of the second barrier coating composition.

[0048] Preferably, after drying in step E, the mass of the first barrier coating composition remaining on the twist-wrap base paper, based on the area to which the first barrier coating composition was applied in step B, is at least 0.6 g / m 2 and a maximum of 1.8 g / m 2 and particularly preferably at least 0.8 g / m 2 and a maximum of 1.5 g / m 2 .

[0049] Preferably, after drying in step E, the mass of the second barrier coating composition remaining on the twist-wrap base paper, based on the area to which the second barrier coating composition was applied in step D, is at least 1.2 g / m 2 and a maximum of 2.7 g / m 2 and particularly preferably at least 1.4 g / m 2 and a maximum of 2.5 g / m 2 .

[0050] The basis weight of the twist wrap paper after step E is preferably at least 25 g / m 2 and a maximum of 60 g / m 2 and particularly preferably at least 33 g / m 2 and a maximum of 55 g / m 2 This basis weight allows for a particularly favorable combination of material consumption for the twist-wrap base paper and that for the barrier layer to achieve the desired barrier properties of the twist-wrap paper. The basis weight can be determined according to ISO 536:2019.

[0051] The thickness of the twist-wrap paper after step E can be important for industrial processing and in particular for twisting the twist-wrap paper. Preferably, the thickness is at least 30 μm and at most 70 μm, particularly preferably at least 35 μm and at most 60 μm. The thickness can be determined according to ISO 534:2011.

[0052] The air permeability of the twist-wrap paper after step E is important for the barrier effect and is particularly low. The air permeability according to Bendtsen is preferably at most 10 ml / min, particularly preferably at most 7 ml / min. The air permeability according to Bendtsen can be determined according to ISO 5636-3:2013.

[0053] The barrier layer on the twist-wrap base paper after step E creates a barrier against the penetration of fats and oils. This barrier effect can be characterized according to TAPPI Method T 559 cm-22 and is specified as a "kit level" with an integer value from 0 to 12. Preferably, the "kit level" of the side of the twist-wrap paper to which the barrier coating compositions were applied in steps B or D, in an area where the barrier coating compositions were applied, is at least 7, more preferably at least 8, and most preferably at least 9.

[0054] A significant advantage of the twist-wrap paper according to step E is that it comprises little or no wax coating. Preferably, the mass of a wax coating makes up less than 0.5%, and more preferably less than 0.1%, of the mass of the twist-wrap paper. In a particularly preferred embodiment of the twist-wrap paper, the twist-wrap paper does not comprise a wax coating.

[0055] The process for producing the twist-wrap paper can preferably comprise further steps in which further coating compositions are applied to one or both sides of the twist-wrap base paper or the twist-wrap paper is printed. In this preferred variant of the process, such further coating compositions can be applied before the application of the first barrier coating composition in step B, i.e., between steps A and B, after the application of the first barrier coating composition in step B, i.e., between steps B and C or steps C and D, or after the application of the second barrier coating composition in step D, i.e., between steps D and E or after step E.

[0056] However, it is not according to the invention to combine the application of the two barrier coating compositions in steps B and D into one coating process or to omit the drying in step C, because, according to the inventors' findings, this does not achieve a higher concentration of kaolin in the thickness direction in a region of the barrier layer that is farther away from the twist-wrap base paper than in a region of the barrier layer that is closer to the twist-wrap base paper. In this case, according to the inventors' findings, a sufficient barrier effect cannot be achieved.

[0057] The invention also relates to a twist-wrap paper that can be produced by the process according to the invention. The twist-wrap paper according to the invention comprises a twist-wrap base paper and a barrier layer, wherein the barrier layer is applied to one side of the twist-wrap base paper, and has a basis weight of at least 1.5 g / m 2 and a maximum of 8.0 g / m 2based on the area to which the barrier layer is actually applied, and wherein the barrier layer comprises the following components: film-forming starch in an amount of at least 65.0% and at most 93.0%, binder in an amount of at least 4.0% and at most 16.0%, kaolin in an amount of at least 2.0% and at most 8.0%, and crosslinking agent in an amount of at least 0.3% and at most 3.0%, wherein the percentages refer to the mass of the barrier layer, and wherein the barrier layer comprises a first and a second coating area arranged one above the other such that the first coating area is closer to the twist-wrap base paper than the second coating area, and the concentration of kaolin in the second coating area is higher than in the first coating area, and wherein the twist-wrap paper has a basis weight of at least 20 g / m 2 and a maximum of 65 g / m 2and less than 1.0% of the mass of the twist wrap paper is formed by a wax coating.

[0058] The twist-wrap paper according to the invention thus has a structure as it results from carrying out the method described above. In particular, the "first coating region" of the barrier layer can be formed by a "first barrier coating" as it results when the first barrier coating composition applied in step B has dried after step C. Similarly, the "second coating region" of the barrier layer can be formed by a "second barrier coating" as it results when the second barrier coating composition applied in step D has dried after step E. However, the first and second barrier coatings cannot necessarily be clearly demarcated from one another on the finished product.Nevertheless, the twist-wrap paper according to the invention is structurally characterized in that it has a first and a second coating region, which differ in particular in that the concentration of kaolin is higher in the second coating region, which is further away from the twist-wrap base paper, than in the first coating region, which is closer to the twist-wrap base paper.

[0059] The kaolin near the surface allows fats and oils to be better kept away from the paper structure, eliminating the need for the wax coating used in conventional twist-wrap papers.

[0060] In a preferred embodiment of the twist wrap paper, the twist wrap paper is a twist wrap paper obtainable by a method according to one of the embodiments described above.

[0061] In a preferred embodiment of the twist-wrap paper, the first coating region comprises a film-forming starch in an amount of at least 65.0% and at most 85.0%, a binder in an amount of at least 10.0% and at most 30.0%, and a crosslinking agent in an amount of at least 1.0% and at most 5.0%, wherein the percentages relate to the mass of the first coating region, and the basis weight of the first coating region, based on the area on which the first coating region is located, is at least 0.5 g / m 2 and a maximum of 3.0 g / m 2and wherein the second coating region comprises a film-forming starch in an amount of at least 75.0% and at most 95.0%, a binder in an amount of at least 1.0% and at most 5.0%, and kaolin in an amount of at least 4.0% and at most 15.0%, wherein the percentages relate to the mass of the second coating region, and the area-related mass of the second coating region, based on the area on which the second coating region is located, is at least 1.0 g / m 2 and a maximum of 5.0 g / m 2 amounts.

[0062] Preferably, the first coating area is arranged directly on the second coating area, which may mean that there are no further layers between these two coating areas.

[0063] The area-related mass of the barrier layer, based on the area to which the barrier layer is applied, is preferably at least 1.5 g / m2 and a maximum of 8.0 g / m 2 and particularly preferably at least 2.0 g / m 2 and a maximum of 7.0 g / m 2 .

[0064] The barrier layer comprises a film-forming starch, wherein preferably at least 70.0% and at most 90.0% and particularly preferably at least 75.0% and at most 85.0% of the mass of the barrier layer is formed by the film-forming starch.

[0065] The barrier layer comprises a binder, wherein preferably at least 5.0% and at most 15.0% and particularly preferably at least 7.0% and at most 13.0% of the mass of the barrier layer is formed by the binder.

[0066] The barrier layer comprises kaolin, wherein preferably at least 3.0% and at most 7.0% and particularly preferably at least 4.0% and at most 6.5% of the mass of the barrier layer is formed by kaolin.

[0067] The barrier layer comprises a crosslinking agent, wherein preferably at least 0.5% and at most 2.5% and particularly preferably at least 0.7% and at most 2.0% of the mass of the barrier layer is formed by the crosslinking agent.

[0068] The basis weight of the twist wrap paper is preferably at least 25 g / m 2 and a maximum of 60 g / m 2 and particularly preferably at least 33 g / m 2 and a maximum of 55 g / m 2 .

[0069] The thickness of the twist-wrap paper is preferably at least 30 μm and at most 70 μm, particularly preferably at least 35 μm and at most 60 μm. The Bendtsen air permeability of the twist-wrap paper is preferably at most 10 ml / min, particularly preferably at most 7 ml / min.

[0070] The “kit level” of the side of the twist-wrap paper on which the barrier layer is located is preferably at least 7, particularly preferably at least 8 and most particularly preferably at least 9 in an area in which the barrier layer is located.

[0071] The mass of a wax coating in the twist-wrap paper preferably makes up less than 0.5% and more preferably less than 0.1% of the mass of the twist-wrap paper. In a particularly preferred embodiment of the twist-wrap paper, the twist-wrap paper does not comprise a wax coating.

[0072] The twist-wrap paper can be provided with additional coatings on one or both sides if required and can also be printed.

[0073] DESCRIPTION OF AN EMBODIMENT OF THE INVENTION

[0074] In the following, an embodiment of the method for producing a twist-wrap paper according to the invention and the twist-wrap paper according to the invention thus obtainable will be described.

[0075] The twist wrap base paper used was the twist wrap base paper available from delfortgroup AG, Traun, Austria, under product number 10003051.

[0076] A first barrier coating composition was applied to the top surface of the twist-wrap base paper in the film press of the paper machine, step B.

[0077] The first barrier coating composition consisted of 90 wt% water and 10 wt% solids. The solids of the first barrier coating composition were formed by 20 wt% synthetic binder, 75.5 wt% film-forming starch, and 3.5 wt% crosslinking agent.

[0078] After application of the first barrier coating composition, the coated twist-wrap base paper was dried by contact with heated drying cylinders (step C), so that the first barrier coating composition formed a first barrier coating. The mass of the first barrier coating based on the area to which the first barrier coating was applied was 1.2 g / m 2 . In a jet coating system, a second barrier coating composition was applied over the entire surface of the dried first barrier coating composition, step D.

[0079] The second barrier coating composition consisted of 87 wt% water and 13 wt% solids. The solids of the second barrier coating composition were composed of 85 wt% of a film-forming starch, 3.5 wt% of a crosslinking agent, and 11.5 wt% kaolin.

[0080] After application of the second barrier coating composition, the coated twist-wrap base paper was dried by a combination of infrared radiation and contact with hot air (step E), so that the second barrier coating composition formed a second barrier coating and the twist-wrap paper was obtained. The mass of the second barrier coating based on the area to which the second barrier coating was applied was 1.6 g / m 2 .

[0081] After drying in step E, the first and second barrier coatings together formed the barrier layer of the twist wrap paper.

[0082] The twist wrap paper had a basis weight of 40 g / m 2 , measured according to ISO 536:2019, and a thickness of 47.5 pm, measured according to ISO 534:2011. The air permeability according to Bendtsen was less than 5 ml / min, measured according to ISO 5636-3:2013.

[0083] The kit level was determined according to TAPPI T 559 cm-22 for the barrier layer side of the twist wrap paper and was 10.

[0084] The twist-wrap paper did not include a wax coating.

[0085] By analyzing the paper cross-section using time-of-flight secondary ion mass spectrometry (TOF-SIMS), it was clearly determined from the distribution of aluminum and silicon across the paper cross-section that the concentration of kaolin - an aluminum silicate - was higher in an area of ​​the barrier layer further away from the surface of the twist-wrap base paper than in an area of ​​the barrier layer closer to the surface of the twist-wrap base paper.

[0086] With these properties, the twist-wrap paper according to the invention was very well suited for use as twist-wrap paper, which was confirmed by industrial tests. Since the twist-wrap paper according to the invention did not contain a wax coating, it can also be easily recycled.

Claims

CLAIMS i. A method for producing a twist-wrap paper, comprising the following steps AE: A - Providing a twist wrap base paper B - applying a first barrier coating composition to one side of the twist wrap base paper, wherein the first barrier coating composition comprises water and - film-forming starch in an amount of at least 65.0% and at most 85.0%, - Binder in an amount of at least 10.0% and at most 30.0%, and - crosslinking agent in an amount of at least 1.0% and at most 5.0%, in each case based on the mass of solids in the first barrier coating composition, C - Drying the first barrier coating composition, D - applying a second barrier coating composition to the dried first barrier coating composition from step C, wherein the second barrier coating composition comprises water and - film-forming starch in an amount of at least 75.0% and at most 95.0%, - Binder in a quantity of at least 1.0% and at most 5.0%, and - kaolin in an amount of at least 4.0% and at most 15.0%, in each case based on the mass of solids in the second barrier coating composition, E - drying the second barrier coating composition, wherein after drying in step E the mass of the first barrier coating composition remaining on the twist-wrap base paper, based on the area to which the first barrier coating composition was applied in step B, is at least 0.5 g / m 2 and a maximum of 3.0 g / m 2and after drying in step E, the mass of the second barrier coating composition remaining on the twist-wrap base paper, based on the area to which the second barrier coating composition was applied in step D, is at least 1.0 g / m 2 and a maximum of 5.0 g / m 2 and wherein the twist wrap paper after step E has a basis weight of at least 20 g / m 2 and a maximum of 65 g / m 2 and wherein less than 1.0% of the mass of the twist wrap paper is formed by a wax coating.

2. The method of claim 1, wherein the first and second barrier coating compositions are applied to the top surface of the twist wrap base paper.

3. The method according to claim 1 or 2, wherein the twist-wrap base paper in step A comprises cellulose fibers, wherein the cellulose fibers are obtained from coniferous woods, in particular spruce, pine or fir; from deciduous woods, in particular birch, beech or eucalyptus; or from other plants, in particular hemp, flax, jute, ramie, kenaf, kapok, coconut, abaca, sisal, bamboo, cotton or from esparto grass, wherein the cellulose fibers are preferably a mixture of cellulose fibers from various of these sources.

4. A process according to any one of the preceding claims, wherein the twist-wrap base paper in step A contains fillers or pigments, the mass of the fillers or pigments in total amounting to no more than 15.0% of the mass of the twist-wrap base paper, preferably no more than 10.0% of the mass of the twist-wrap base paper.

5. A process according to claim 4, wherein the fillers or pigments are formed by calcium carbonate, magnesium carbonate, magnesium hydroxide, magnesium oxide, kaolin, titanium dioxide or mixtures thereof.

6. The method according to any one of the preceding claims, wherein providing the twist wrap base paper in step A comprises producing the twist wrap base paper in a paper machine, preferably in a Fourdrinier paper machine.

7. A process according to any one of the preceding claims, wherein the application of the first barrier coating composition in step B is carried out in a film press of a paper machine, a bar coater, a curtain coater, a jet coater or a printing device.

8. A process according to any one of the preceding claims, wherein the first barrier coating composition in step B is applied to at least 70%, preferably to at least 90% of the area of one side of the twist-wrap base paper. 9- A process according to any one of the preceding claims, wherein the drying in step C is carried out by contact with a heated surface, by contact with hot air, by infrared radiation or by microwave radiation.

10. A process according to any one of the preceding claims, wherein the application of the second barrier coating composition in step D is carried out in a film press of a paper machine, a bar coater, a curtain coater, a jet coater or a printing device.

11. A process according to any one of the preceding claims, wherein the second barrier coating composition in step D is applied to at least 70%, preferably to at least 90% of the area of one side of the twist-wrap base paper so that it is applied at least partially, but not necessarily directly, to the first barrier coating.

12. The method according to any one of the preceding claims, wherein exactly two barrier coating compositions are applied, wherein the two barrier coating compositions are preferably applied directly to one another, with drying in step C as an intermediate step.

13. A method according to any one of the preceding claims, wherein the drying in step E is carried out by contact with a heated surface, by contact with hot air, by infrared radiation or by microwave radiation.

14. A process according to any one of the preceding claims, wherein the first barrier coating composition comprises the film-forming starch in an amount of at least 67.0% and at most 83.0%, preferably in an amount of at least 70.0% and at most 80.0%, in each case based on the mass of solids in the first barrier coating composition.

15. A process according to any one of the preceding claims, wherein the first barrier coating composition comprises the binder in an amount of at least 12.0% and at most 28.0%, preferably in an amount of at least 15.0% and at most 25.0%, in each case based on the mass of solids in the first barrier coating composition.

16. A method according to any one of the preceding claims, wherein the binder in the first and / or in the second barrier coating composition is a sty- rol-butadiene copolymer, a styrene-acrylate copolymer or a mixture thereof, preferably a styrene-1,3 butadiene latex.

17. A process according to any one of the preceding claims, wherein the first barrier coating composition comprises the crosslinking agent in an amount of at least 1.5% and at most 4.5%, preferably in an amount of at least 2.0% and at most 4.0%, in each case based on the mass of solids in the first barrier coating composition.

18. A process according to any one of the preceding claims, wherein the crosslinking agent comprises glyoxal or potassium zirconium carbonate.

19. A process according to any one of the preceding claims, wherein the first barrier coating composition has a solids content of at least 5.0% and at most 15.0%, preferably of at least 8.0% and at most 13.0%, in each case based on the mass of the first barrier coating composition.

20. A method according to any one of the preceding claims, wherein the first barrier coating composition has a pH of at least 8 and at most 10.

21. A process according to any one of the preceding claims, wherein the second barrier coating composition comprises the film-forming starch in an amount of at least 78.0% and at most 92.0%, preferably at least 83.0% and at most 90.0%, in each case based on the mass of solids in the second barrier coating composition.

22. A process according to any one of the preceding claims, wherein the second barrier coating composition comprises the binder in an amount of at least 1.5% and at most 4.5%, preferably at least 2.0% and at most 4.0%, in each case based on the mass of solids in the second barrier coating composition.

23. A process according to any one of the preceding claims, wherein the second barrier coating composition comprises the kaolin in an amount of at least 6.0% and at most 13.0%, preferably at least 7.0% and at most 11.0%, in each case based on the mass of solids in the second barrier coating composition. 24- Process according to one of the preceding claims, in which the kaolin is in the form of particles and has a particle size distribution such that 90% of the total particle volume is formed by particles having a size (D 90 ) of less than 3.0 pm, preferably less than 2.5 pm and particularly preferably less than 2.0 pm.

25. A process according to any one of the preceding claims, wherein the second barrier coating composition has a solids content of at least 10.0% and at most 20.0%, preferably of at least 12.0% and at most 18.0%, in each case based on the mass of the second barrier coating composition.

26. A process according to any one of the preceding claims, wherein after drying in step E, the mass of the first barrier coating composition remaining on the twist wrap base paper, based on the area to which the first barrier coating composition was applied in step B, is at least 0.6 g / m 2 and a maximum of 1.8 g / m 2 , preferably at least 0.8 g / m 2 and a maximum of 1.5 g / m 2 amounts.

27. A process according to any one of the preceding claims, wherein after drying in step E, the mass of the second barrier coating composition remaining on the twist wrap base paper, based on the area to which the second barrier coating composition was applied in step D, is at least 1.2 g / m 2 and a maximum of 2.7 g / m 2 , preferably at least 1.4 g / m 2 and a maximum of 2.5 g / m 2 amounts.

28. A method according to any one of the preceding claims, wherein the basis weight of the twist wrap paper after step E is at least 25 g / m 2 and a maximum of 60 g / m 2 , preferably at least 33 g / m 2 and a maximum of 55 g / m 2 amounts.

29. Method according to one of the preceding claims, wherein the thickness of the twist-wrap paper after step E is at least 30 pm and at most 70 pm, preferably at least 35 pm and at most 60 pm.

30. A method according to any one of the preceding claims, wherein the Bendtsen air permeability of the twist-wrap paper after step E is at most 10 ml / min, preferably at most 7 ml / min.

31. A process according to any one of the preceding claims, wherein the kit level, determined according to TAPPI method T 559 cm-22, of the side of the twist-wrap paper after step E to which the barrier coating compositions were applied in steps B and D, respectively, in an area in which the barrier coating compositions were applied is at least 7, preferably at least 8 and particularly preferably at least 9.

32. A method according to any one of the preceding claims, wherein the twist wrap paper according to step E does not comprise a wax coating, or the mass of a wax coating is less than 0.5%, preferably less than 0.1%, of the mass of the twist wrap paper.

33. Twist-wrap paper comprising a twist-wrap base paper and a barrier layer, wherein the barrier layer is applied to one side of the twist-wrap base paper and has a basis weight of at least 1.5 g / m 2 and a maximum of 8.0 g / m 2 based on the area to which the barrier layer is actually applied, and wherein the barrier layer comprises the following components: film-forming starch in an amount of at least 65.0% and at most 93.0%, Binder in an amount of at least 4.0% and at most 16.0%, kaolin in an amount of at least 2.0% and at most 8.0%, and crosslinking agent in an amount of at least 0.3% and at most 3.0%, each based on the mass of the barrier layer, and wherein the barrier layer comprises a first and a second coating area arranged one above the other such that the first coating area is closer to the twist-wrap base paper than the second coating area, wherein the concentration of kaolin in the second coating area is higher than in the first coating area, and wherein the twist-wrap paper has a basis weight of at least 20 g / m 2 and a maximum of 65 g / m 2 and less than 1.0% of the mass of the twist wrap paper is formed by a wax coating.

34. Twist-wrap paper according to claim 33, which is obtainable by a process according to any one of claims 1 to 32.

35. Twist-wrap paper according to claim 33 or 34, wherein the first coating area - a film-forming starch in a quantity of at least 65.0% and at most 85.0%, - a binder in a quantity of at least 10.0% and at most 30.0%, and - a crosslinking agent in an amount of at least 1.0% and at most 5.0%, in each case based on the mass of the first coating area, and the mass per unit area of the first coating area, based on the area on which the first coating area is located, is at least 0.5 g / m 2 and a maximum of 3.0 g / m 2 and wherein the second coating area - a film-forming starch in a quantity of at least 75.0% and at most 95.0%, - a binder in a quantity of at least 1.0% and at most 5.0%, and - kaolin in an amount of at least 4.0% and at most 15.0%, in each case based on the mass of the second coating area, and the mass per unit area of the second coating area, based on the area on which the second coating area is located, is at least 1.0 g / m 2 and a maximum of 5.0 g / m 2 amounts.

36. Twist-wrap paper according to one of claims 33 to 35, wherein the first coating area is arranged directly on the second coating area.

37. Twist-wrap paper according to one of claims 33 to 36, wherein the basis weight of the barrier layer, based on the area to which the barrier layer is applied, is at least 1.5 g / m 2 and a maximum of 8.0 g / m 2 , preferably at least 2.0 g / m 2 and a maximum of 7.0 g / m 2 amounts.

38. Twist-wrap paper according to one of claims 33 to 37, in which at least 70.0% and at most 90.0%, preferably at least 75.0% and at most 85.0% of the mass of the barrier layer is formed by the film-forming starch.

39. Twist-wrap paper according to one of claims 33 to 38, in which at least 5.0% and at most 15.0%, preferably at least 7.0% and at most 13.0% of the mass of the barrier layer is formed by the binder.

40. Twist-wrap paper according to one of claims 33 to 39, in which at least 3.0% and at most 7.0%, preferably at least 4.0% and at most 6.5% of the mass of the barrier layer is formed by kaolin.

41. Twist-wrap paper according to one of claims 33 to 40, in which at least 0.5% and at most 2.5%, preferably at least 0.7% and at most 2.0% of the mass of the barrier layer is formed by the crosslinking agent.

42. Twist-wrap paper according to one of claims 33 to 41, the basis weight of which is at least 25 g / m 2 and a maximum of 60 g / m 2 , preferably at least 33 g / m 2 and a maximum of 55 g / m 2 amounts.

43. Twist-wrap paper according to one of claims 33 to 42, the thickness of which is at least 30 pm and at most 70 pm, preferably at least 35 pm and at most 60 pm.

44. Twist-wrap paper according to one of claims 33 to 43, the air permeability of which according to Bendtsen is at most 10 ml / min, preferably at most 7 ml / min.

45. Twist-wrap paper according to one of claims 33 to 44, wherein the kit level, determined according to the TAPPI method T 559 cm-22, of the side of the twist-wrap paper on which the barrier layer is located, in a region in which the barrier layer is located, is at least 7, preferably at least 8 and particularly preferably at least 9.

46. Twist-wrap paper according to one of claims 33 to 45, which does not comprise a wax coating, or in which the mass of a wax coating constitutes less than 0.5%, preferably less than 0.1%, of the mass of the twist-wrap paper.