Environmentally friendly packaging material, method for manufacturing environmentally friendly packaging material, and third coating color

Abstract

The present invention relates to an environmentally friendly packaging material comprising: a carrier substrate having a first side and a second side facing away from the first side; at least one first coating color layer disposed on the first side and / or second side of the carrier substrate, wherein the at least one first coating color layer comprises at least one inorganic pigment and at least one polymer binder, or the at least one first coating color layer comprises at least one polymer binder and does not contain an inorganic pigment; at least one second coating color layer directly applied to the at least one first coating color layer, wherein the at least one second coating color layer comprises at least one inorganic pigment and at least one polymer binder, or the at least one second coating color layer comprises at least one polymer binder and does not contain an inorganic pigment; and at least one third coating color layer directly or indirectly applied to the at least one second coating color layer, wherein the at least one third coating color layer is a barrier layer and / or a sealable layer.

Description

[Technical Field]

[0001] According to a first aspect, the present invention relates to an environmentally friendly packaging material including a carrier substrate, wherein the carrier substrate has a first side and a second side facing away from the first side, and includes at least one first coating color layer disposed on the first and / or second side of the carrier substrate, at least one second coating color layer directly applied to the at least one first coating color layer, and at least one third coating color layer directly or indirectly applied to the at least one second coating color layer, wherein the third coating color layer is a barrier layer and / or a sealable layer.

[0002] According to a second aspect, the present invention relates to a method for manufacturing environmentally friendly packaging materials.

[0003] According to a third aspect, the present invention relates to an environmentally friendly packaging material that can be manufactured by the method according to the second aspect.

[0004] According to a fourth aspect, the present invention relates to the use of environmentally friendly packaging materials according to the first and / or third aspects for packaging, particularly for consumer goods, food, electronic products and / or tobacco products.

[0005] According to a fifth aspect, the present invention relates to a third coating color used for indirect or direct coating of a second coating color layer, which is applied to a first coating color layer, where the first coating color layer is applied to a carrier substrate. [Background technology]

[0006] Packaging material or wrapping paper generally refers to a paper-based covering, particularly the partial or complete covering of an object, especially for its protection or ease of handling. Therefore, packaging material or wrapping paper includes the paper material that forms such packaging.

[0007] Conventional packaging materials are used particularly for packaging consumer goods, food products, electronic items, and / or tobacco products.

[0008] Packaging materials for consumer goods, food, electronic products, and / or tobacco products protect the packaged products from external influences such as moisture and dirt, while preventing the leakage of ingredients from the packaged products. To achieve this objective, packaging materials for consumer goods, food, electronic products, and / or tobacco products must meet various standards. Among other things, suitable packaging materials should meet mechanical and process-specific requirements and exhibit effective barrier properties against substances such as water, grease, mineral oil, fragrances, and / or oxygen.

[0009] Packaging materials for consumer goods, food, electronic products, and / or tobacco products should have sufficient tear resistance, a suitable coefficient of friction for further processes in printing and packaging machinery, or sufficient flexibility to effectively package the products. Depending on the application, the packaging material may be simple wrapping paper, or it may be used in the manufacture of bags if it is partially or fully coated with a heat and cold sealable coating, and it should also be printable on the outside and retain its protective properties throughout the entire conversion and packaging process.

[0010] Furthermore, for packaging materials used to package consumer goods, food, electronic items and / or tobacco products, particularly fatty consumer goods, food, electronic items and / or tobacco products, it is important to use fluorine-free chemicals to avoid fluorine contamination of packaging products and / or the release of fluorine-containing chemicals into the environment.

[0011] WO2022 / 003472 A1 discloses barrier coating colors for paper and cardboard, which comprise polysaccharides and polycationic polymers.

[0012] WO2022 / 269198A1 discloses a multilayer packaging material that has barrier properties, is biodegradable, and is recyclable.

[0013] JP2003-013391A discloses packaging materials having a biodegradable resin coating.

[0014] US3, 932, 192 discloses the use of pullulan in paper coatings.

[0015] WO2008 / 068779 A2 discloses a packaging material having a water-soluble film.

[0016] Conventional packaging materials, when they are selectively made from plastics, especially fossil fuels, are often not recyclable or are only recyclable to a limited extent, and are often not biodegradable or are only biodegradable to a limited extent.

[0017] Conventional packaging is largely composed of plastic, which decomposes in nature only over a very long period of time, thus contributing significantly to global plastic pollution.

[0018] Therefore, it is necessary to replace conventional plastic-based packaging with environmentally friendly packaging, such as that based on natural materials.

[0019] Furthermore, the corresponding packaging must provide a high level of safety with respect to the packaged product. An important criterion in evaluating the safety of packaging materials is that components of conventional packaging materials, particularly those containing water-soluble components, do not migrate from the packaging material to the respective packaged consumer goods and / or food products, or respective packaged tobacco products, and contaminate them, or migrate only to a very low degree, thereby eliminating or minimizing potential health risks to users when using consumer goods, food products, electronic items, and / or tobacco products packaged in such materials.

[0020] Conventional packaging materials, even when made from natural raw materials, often have limited barrier effects against oxygen, water vapor, mineral oil, aromatic substances, and / or fats. Therefore, in many cases, they are unsuitable or only suitable to a limited extent for packaging consumer goods, food, electronic products, and / or tobacco products.

[0021] Conventional coating colors used to create coating color layers for packaging materials have another problem: even those made from natural raw materials are often unsuitable for large-scale industrial production. Corresponding industrial coating machines for applying coating colors to carrier substrates often achieve material production rates exceeding 1000 meters / minute. However, the viscosity of the coating colors applied by these machines must be within a narrow viscosity range to ensure successful large-scale industrial production of packaging materials. Conventional coating colors, even those made from natural raw materials, often have very high viscosity, making them unsuitable for large-scale industrial packaging production.

[0022] Furthermore, when using conventional coating colors to create coating color layers for packaging materials, it is necessary to ensure that these coating colors, especially those made from natural raw materials, do not have too low a solids content. This is because if they do, they cannot be used economically. This is due to the increased energy required to effectively dry such low-concentration coating colors, and also because the coating application of the corresponding low-concentration coating color layer becomes thinner during the drying process, requiring numerous repetitions of the coating process, thus limiting the economic applicability of the corresponding low-concentration coating color. [Overview of the project]

[0023] definition As used in the context of this invention, the term "coating color" refers, in accordance with the common understanding in the paper technology, to a coating material comprising or consisting of a binder, additives and / or pigments, which is applied or "coated" to the surface of a carrier substrate, particularly the paper surface, using a special coating apparatus for surface finishing or modification of a carrier substrate or carrier paper. Paper thus produced is called "coated paper."

[0024] In the context of the present invention, "coated paper" is understood to mean a carrier substrate including one or more layers applied by coating, i.e., a coating color layer. Suitable layers of such a coated substrate include functional layers and structure-forming layers, such as a leveling layer for smoothing the surface.

[0025] According to the present invention, the term "coating color" is used as a general term for all coatable coating compounds, preparations, and / or solutions used in the paper industry to treat, modify, or finish paper surfaces. The term "coating color layer" refers to a coating color that is applied to a carrier substrate, dried, and forms a film.

[0026] The “paper” according to the present invention is a sheet material essentially composed of plant-derived fibers and formed by dewatering a fiber suspension on a mesh. The resulting fiber web is compressed and dried. Within the scope of the present invention, “cartons” and “cardboard,” which are sheet materials produced by the same method, are also included under the term paper. The distinction between paper, cartons and cardboard is made solely based on their basis weight; here, cardboard has a basis weight of 600 g / m². 2 Larger cartons have a basis weight of 150g / m². 2 Larger than 600g / m² 2 If smaller than or equal to 150 g / m², the paper has a basis weight of 150 g / m². 2 Less than or equal to.

[0027] The molar mass M of a compound is defined by the formula M = m / n, which represents the ratio of the compound's mass m to its amount of substance n, with the unit being g / mol.

[0028] The molar mass of a polymer is usually not constant and is described by its molar mass distribution. To statistically describe the molar mass of a polymer, various mean values ​​of the molar mass distribution can be defined, including viscosity-average, mass-average, and number-average molar masses. The molar mass M of a polymer with number i monomers is... i This is weighted by the relative fractional proportion exhibited by this polymer. Number-average molar mass M n The average molar mass of all polymers in the sample is expressed by the following formula. Here, N i This corresponds to the number of monomers in the sample that have exactly i repeating units. JPEG2026520070000002.jpg20110 Definition of Objective The objective of the present invention is to provide an environmentally friendly packaging material, that is, to provide a biodegradable and / or advantageously recyclable packaging material.

[0029] Furthermore, the present invention aims to provide an environmentally friendly packaging material that reduces the migration of components from the packaging material to products packaged with the packaging material, such as consumer goods, food products, electronic products, and / or tobacco products.

[0030] At the same time, the packaging material of the present invention is intended to prevent, or at least delay, the migration of components, particularly fats and oils, of packaged products such as consumer goods, food, electronic products and / or tobacco products to the outside.

[0031] Furthermore, the present invention aims to ensure that the corresponding environmentally friendly packaging material has high crease resistance and / or sealing properties in order to reliably increase the design freedom of packaging made of packaging material.

[0032] The present invention further aims to enable the economical production of the corresponding environmentally friendly packaging material on a large-scale industrial basis, thereby allowing this environmentally friendly packaging material to be manufactured, for example, by industrial coating machines with a production speed exceeding 1,000 meters per minute.

[0033] Furthermore, the present invention aims to ensure that the corresponding coating color used to manufacture the corresponding coating color layer of environmentally friendly packaging material has a sufficiently high solid content concentration, thereby enabling the drying of these coating colors with low drying energy during the production of the corresponding coating color layer, and eliminating the need for multi-layer coating to apply a sufficiently thick coating color layer. [Brief explanation of the drawing]

[0034] [Figure 1] A schematic representation of the environmentally friendly packaging material according to the present invention is shown. [Figure 2] This shows the visual representation of the surface of the first coating color layer applied to a carrier substrate and dried.

[0035] Environmentally friendly packaging materials The above problem is solved according to a first embodiment of an environmentally friendly packaging material comprising: a carrier substrate having a first side and a second side facing away from the first side; at least one first coating color layer disposed on the first side and / or second side of the carrier substrate, wherein at least one first coating color layer comprises at least one inorganic pigment and at least one polymer binder, or at least one first coating color layer comprises at least one polymer binder and does not contain an inorganic pigment; at least one second coating color layer directly applied to at least one first coating color layer, wherein at least one second coating color layer comprises at least one inorganic pigment and at least one polymer binder, or at least one second coating color layer comprises at least one polymer binder and does not contain an inorganic pigment; and at least one third coating color layer directly or indirectly applied to at least one second coating color layer, wherein at least one third coating color layer is a barrier layer and / or a sealable layer.

[0036] At least one third coating color layer of the environmentally friendly packaging material, which is suitable as a barrier layer, prevents the migration of oxygen, water vapor, grease, mineral oil, and / or aromatic substances through the packaging material, making the packaging material suitable for packaging multiple different products, and also preventing external substances from penetrating the packaged product through at least one third coating color layer.

[0037] At least one third coating color layer of the environmentally friendly packaging material, adapted as a sealable layer, ensures that the environmentally friendly packaging material can be used in the manufacture of bags.

[0038] The polymer binders or inorganic pigments used in the first and second coating color layers are each derived from natural raw materials, thus ensuring the advantageous environmental compatibility of the packaging material according to the present invention. In particular, since the environmentally friendly packaging material according to the present invention is advantageously biodegradable and / or recyclable, it greatly contributes to reducing global plastic pollution.

[0039] Furthermore, by applying a combination of at least one first coating color layer, at least one second coating color layer, and at least one third coating color layer to the carrier substrate in the order described above, an effective barrier effect of the environmentally friendly packaging material is ensured. As a result, the migration of components of the packaging material to products packaged by the packaging material, such as consumer goods, food, electronic products, and / or tobacco products, is effectively reduced, thereby advantageously reducing the risk of health hazards to users of the packaging material from contaminated products.

[0040] In particular, the packaging material according to the present invention prevents the migration of oxygen, water vapor, grease, mineral oil, and / or aromatic substances through the packaging material, and is therefore suitable for packaging multiple different products.

[0041] Using at least three coating color layers on a carrier substrate according to the present invention significantly increases the barrier effect compared to known packaging materials having two or only one coating color layer on a carrier substrate.

[0042] Therefore, the environmentally friendly packaging material according to the present invention functions as at least an equivalent alternative to conventional plastic-based packaging materials such as unprinted plastics, printed plastics, or coated plastics.

[0043] At least one first, second, or third coating color layer is required to be effectively applied to the carrier substrate. In particular, the first, second, and / or third coating color layers are first, second, and / or third coating color layers applied using an aqueous dispersion or solution.

[0044] Herein, at least one first coating color layer, particularly one directly applied to a carrier substrate, ensures that a second coating color layer subsequently applied directly to the first coating color layer provides a favorably uniform coating, or each second coating color layer directly applied to the first coating color layer ensures that a third coating color layer subsequently applied directly or indirectly provides a favorably uniform coating.

[0045] Furthermore, by applying at least one first coating color layer to the carrier substrate, or by applying at least one second coating color layer to the first coating color layer, the application weight of at least one third coating color layer can be advantageously reduced, and no adverse properties of the packaging material are observed.

[0046] In particular, at least one first coating color layer includes at least one front-side first coating color layer located on the first side of the carrier substrate, or at least one first coating color layer includes at least one back-side first coating color layer located on the second side of the carrier substrate, or at least one first coating color layer includes at least one front-side first coating color layer located on the first side of the carrier substrate and at least one back-side first coating color layer located on the second side of the carrier substrate.

[0047] In particular, at least one second coating color layer includes at least one front second coating color layer applied directly to at least one front first coating color layer, or at least one second coating color layer includes at least one back second coating color layer applied directly to at least one back first coating color layer, or at least one second coating color layer includes at least one front second coating color layer applied directly to at least one front first coating color layer, and at least one back second coating color layer applied directly to at least one back first coating color layer.

[0048] In particular, at least one third coating color layer includes at least one front-side third coating color layer applied directly or indirectly to at least one front-side second coating color layer, or at least one third coating color layer includes at least one back-side third coating color layer applied directly or indirectly to at least one back-side second coating color layer, or at least one third coating color layer includes at least one front-side third coating color layer applied directly or indirectly to at least one front-side second coating color layer, or at least one back-side third coating color layer applied directly or indirectly to at least one back-side second coating color layer.

[0049] Therefore, depending on whether the first, second, and third coating color layers are arranged on one side or both sides of the carrier substrate, at least three layers or at least six layers can be present in the environmentally friendly packaging material.

[0050] According to one embodiment, the environmentally friendly packaging material satisfies at least one, preferably at least two, more preferably at least three, even more preferably at least four, even more preferably at least five, even more preferably at least six, even more preferably at least seven, and even more preferably at least eight of the following defined conditions: a) The roughness of the environmentally friendly packaging material is 1 μm to 10 μm, preferably 1 μm to 8 μm, more preferably 2 μm to 6 μm, and most preferably 3 μm to 5 μm; b) The oxygen permeability at a temperature of 23 °C ± 2 °C and a relative humidity of 0% according to the standard DIN ISO 15105-2 is less than 10 cm 3 / m 2 / day, preferably less than 8 cm 3 / m 2 / day, more preferably less than 5 cm 3 / m 2 / day, and most preferably less than 1 cm 3 / m 2 / day; c) The water vapor transmission rate according to the standard ISO 15106-2 is less than 30 g / m 2 , preferably 25 g / m 2 ; d) The fold resistance of the outer fold of the environmentally friendly packaging material after folding at a load of 330 g / cm, and / or the fold resistance of the inner fold of the environmentally friendly packaging material after folding at a load of 330 g / cm; e) Grease resistance according to the standard DIN 53116; f) Aroma resistance by the hexane vapor transmission test (HVTR) is less than 10 g / m 2 / day; g) The KIT value determined according to the standard Tappi T 559 is greater than 6, preferably greater than 8, more preferably greater than 10, and most preferably 12 or greater; h) Sealing property according to the standard DIN 55529 (2012). In particular, the environmentally friendly packaging material has a roughness of 1 μm to 10 μm, preferably 1 μm to 8 μm, more preferably 2 μm to 6 μm, and most preferably 3 μm to 5 μm.

[0051] This achieves the technical advantage that a suitable primer reduces the average roughness of the base paper, creating a desirable holdout characterized by a coating that covers the surface and a defined surface energy, thereby allowing the coated barrier layer to be optimally formed. Furthermore, the primer promotes adhesion between the base paper and the barrier layer, which can be important for subsequent seal coatings.

[0052] In particular, environmentally friendly packaging materials are manufactured according to the standard DIN ISO15105-2, at a temperature of 23°C ± 2°C and a relative humidity of 0% (10 cm²). 3 / m 2 Less than / day, preferably 8cm 3 / m 2 Smaller than / day, preferably 5cm 3 / m 2 Less than / day, most preferably 1cm 3 / m 2 It has an oxygen permeability lower than / day.

[0053] This achieves a technical advantage: due to its favorable oxygen barrier properties, it allows perishable products, such as food, to be stored advantageously for longer periods using environmentally friendly packaging materials.

[0054] In particular, environmentally friendly packaging materials have a water vapor transmission rate of 30 g / m³. 2 Smaller than 25 g / m², preferably 25 g / m² 2 It is smaller than that. In particular, the water vapor transmission rate is determined by the standard ISO 15106-2.

[0055] This provides a technical advantage: environmentally friendly packaging materials have a beneficial barrier effect against water.

[0056] In particular, the environmentally friendly packaging material has fold resistance at the outer fold of the environmentally friendly packaging material after being bent under a load of 330 g / cm, and / or the environmentally friendly packaging material has fold resistance at the inner fold of the environmentally friendly packaging material after being bent under a load of 330 g / cm.

[0057] This achieves the technical advantage that the corresponding fold resistance enables the use of the packaging material in wrap-around packaging. In particular, the fold resistance of the outer and / or inner folds after bending is determined by visual analysis and evaluation of the folds under a scanning electron microscope, optionally followed by a grease test according to standard DIN 53116.

[0058] In particular, the environmentally friendly packaging material has grease resistance according to standard DIN 53116.

[0059] This provides a technical advantage in that environmentally friendly packaging materials are favorably suited for packaging fatty foods. The grease resistance test performed according to the DIN 53116 standard is also known as the Palm Kernel Oil Grease Test (PKOFT).

[0060] In particular, environmentally friendly packaging materials have an aroma resistance of 10 g / m² as measured by the hexane vapor permeation test (HVTR). 2 Less than / day

[0061] This achieves the technical advantage of enabling effective odor resistance in environmentally friendly packaging materials.

[0062] In particular, the hexane vapor permeation test (HVTR) is performed by gravimetric measurement using a beaker according to standard DIN 53122-1, where the beaker is filled with n-hexane and the sample is fixed in the beaker with its coated side facing the n-hexane. Hexane loss is determined by repeatedly weighing the beaker over a defined area over a 24-hour period.

[0063] In particular, environmentally friendly packaging materials have a KIT value greater than 6, preferably greater than 8, more preferably greater than 10, and most preferably greater than or equal to 12, according to the Tappi T 559 standard.

[0064] Here, a KIT value greater than 6, preferably greater than 8, more preferably greater than 10, and most preferably greater than or equal to 12, as determined by the standard Tappi T 559, characterizes the particularly advantageous barrier properties of the environmentally friendly packaging material, thereby ensuring that the fatty components of the food do not penetrate the packaging material to the outside, especially in the case of packaged fatty foods.

[0065] As a result, the packaging material is particularly suitable for packaging food, especially fatty foods, and meets existing legal standards for food packaging in Europe and / or individual European countries.

[0066] In particular, environmentally friendly packaging materials have sealability according to the DIN55529 (2012) standard.

[0067] Specifically, coated paper was sealed perpendicular to the grain direction at a temperature range of 100°C to 200°C at 3.3 bar (0.33 MPa) for 0.3 seconds, and the seal strength was measured.

[0068] This achieves the technical advantage that the packaging material is not only suitable as wrapping paper or a wrapper, but can also be used to manufacture closed packaging such as bags.

[0069] In particular, environmentally friendly packaging materials are adapted to be either heat-sealable or cold-sealable. Heat-sealable packaging materials are understood to be made by joining two layers of packaging material using localized heat and / or pressure. Cold-sealable packaging materials involve applying a cold-sealable adhesive to the section of packaging material to be sealed using a pressure process. In particular, environmentally friendly packaging materials are also adapted to be ultrasonically sealable.

[0070] According to one embodiment, the environmentally friendly packaging material is suitable as a biodegradable environmentally friendly packaging material.

[0071] This achieves a technical advantage in that the corresponding biodegradable packaging material can be biologically broken down and thus decomposed by organisms over a longer period after disposal, thus removing packaging material from the ever-increasing amount of packaging waste.

[0072] In particular, the rapid biodegradability of packaging materials under aerobic conditions is demonstrated by testing in the OECD 301(AF) test series. For the purposes of this invention, packaging materials are defined as "biodegradable" and thus exhibit inherent or basic biodegradability if they show at least 40% biodegradability when measured by OECD 301F, or at least 20% biodegradability when measured by OECD 302C (MITI-II test). This corresponds to the limit value of OECD 302 C according to the "OECD Guidelines for Testing Chemicals Revised March 23, 2006, Preface Section 3 Part 1". Packaging materials are considered rapidly biodegradable if they meet the threshold of at least 60% when measured by OECD 301F.

[0073] According to one embodiment, the environmentally friendly packaging material is conformed as a recyclable environmentally friendly packaging material, wherein the recyclable environmentally friendly packaging material conforms in particular to standard PTS-RH 021:2012-Category II and / or standard Aticelca UNI 11743:2019 (certification body Aticelca) and / or standard 501:2019 (Aticelca).

[0074] When recycling packaging materials, it is also appropriate to remove the printing ink from the packaging materials. Recyclability can be evaluated, for example, using the INGEDE method 11, in which case the packaging material according to the present invention preferably achieves a value of more than 50 using the INGEDE method 11, and most preferably achieves a value of more than 70.

[0075] This achieves the technical advantage of enabling appropriately recyclable and environmentally friendly packaging materials to be advantageously reused after use, resulting in improved packaging sustainability. In particular, recyclable packaging materials can be incorporated into the packaging cycle.

[0076] According to one embodiment, at least one first coating color layer comprises a single first coating color layer which is located on the first or second side of the carrier substrate.

[0077] This achieves a technical advantage by reducing the manufacturing effort of the packaging material by using only a single first coating color layer.

[0078] According to an alternative embodiment, at least one first coating color layer comprises a first coating color layer disposed on the first or second side of a carrier substrate, and the at least one first coating color layer comprises at least one further first coating color layer applied to the first coating color layer, wherein the first coating color layer and the at least one further first coating color layer comprise at least one inorganic pigment and at least one polymer binder, or the first coating color layer and the at least one further first coating color layer comprise at least one polymer binder and not an inorganic pigment.

[0079] This achieves the technical advantage of increasing the barrier effect of the packaging material depending on the application, and further reducing the application weight of the second or third coating color layer applied on top of the multiple first coating color layers, by using multiple first coating color layers between the carrier substrate and at least one second coating color layer.

[0080] According to one embodiment, at least one second coating color layer comprises a single second coating color layer which is applied directly to at least one first coating color layer.

[0081] This achieves a technical advantage in reducing the manufacturing effort of packaging materials by using only a single second coating color layer.

[0082] According to an alternative embodiment, at least one second coating color layer includes a second coating color layer applied directly to at least one first coating color layer, and at least one second coating color layer includes at least one further second coating color layer applied to the second coating color layer.

[0083] This achieves the technical advantage that, depending on the application, the use of multiple second coating color layers can increase the barrier effect of the packaging material and result in a reduction in the weight of the applied first or third coating color layer.

[0084] According to one embodiment, at least one third coating color layer comprises a single third coating color layer which is applied directly or indirectly to at least one second coating color layer.

[0085] This achieves the technical advantage of reducing the manufacturing effort of packaging materials by using only a single third coating color layer.

[0086] According to an alternative embodiment, at least one third coating color layer comprises a third coating color layer applied directly or indirectly to at least one second coating color layer, and at least one third coating color layer comprises at least one further third coating color layer applied to the third coating color layer.

[0087] This achieves the technical advantage of increasing the barrier effect of the packaging material and, if necessary, reducing the weight of the applied first or second coating color layer by using multiple third coating color layers, depending on the application.

[0088] According to one embodiment, the carrier substrate includes pulp, in which the carrier substrate particularly includes cellulose fibers.

[0089] This achieves the technical advantages of being able to be effectively used as packaging, on the one hand, because the pulp or cellulose fibers are made from natural and environmentally friendly materials, and on the other hand, because the pulp or cellulose fibers ensure sufficient structural stability of the environmentally friendly packaging material.

[0090] In particular, pulp, especially cellulose fibers, is the sole component of carrier base materials for environmentally friendly packaging materials.

[0091] According to one embodiment, at least one pulp, particularly cellulose fibers, comprises a weight fraction of at least 70% by weight, preferably at least 75% by weight, more preferably at least 80% by weight, and most preferably at least 85% by weight, based on the total weight of the components of the environmentally friendly packaging material.

[0092] According to one embodiment, the carrier substrate includes long fiber pulp and / or short fiber pulp.

[0093] This achieves the technical advantage of ensuring particularly favorable structural properties of the packaging material by using long-fiber pulp and / or short-fiber pulp. Here, long-fiber pulp is understood to mean, in particular, pulp derived from coniferous trees, or in particular, pulp containing fibers with a fiber length of 0.5 mm to 4.4 mm, or 0.7 mm to 3.5 mm, or 2.6 mm to 4.4 mm. Here, short-fiber pulp is understood to mean, in particular, pulp derived from hardwoods, or in particular, pulp containing fibers with a fiber length of 0.5 to 2.2 mm, or 0.7 mm to 2.2 mm, or especially preferably 0.5 to 1.5 mm.

[0094] According to one embodiment, the long fiber pulp has a weight fraction of 10% to 80% by weight, preferably 20% to 50% by weight, based on a fiber mixture of long fiber pulp and short fiber pulp.

[0095] According to one embodiment, the short fiber pulp has a weight fraction of 20% to 90% by weight, preferably 50% to 80% by weight, based on a fiber mixture of long fiber pulp and short fiber pulp.

[0096] This achieves a technical advantage in that the corresponding weight ratio of long-fiber pulp or short-fiber pulp ensures that the packaging material possesses favorable properties.

[0097] Preferably, cellulose fibers from a) wood, such as hardwoods or conifers, b) annual plants and herbs, such as cup plants, hemp, and straw, c) treated paper waste, or d) treated waste paper, or mixtures thereof, are used in the production of the carrier substrate. The properties of the carrier substrate can be set by known methods, particularly by the type of cellulose fiber, the treatment of the cellulose fiber, such as pulping, extraction, and purification and mixing of the cellulose fiber.

[0098] According to one embodiment, the carrier substrate includes virgin fibers, primary fibers, secondary fibers, and / or recycled fibers.

[0099] This achieves a technical advantage in that the use of recycled fibers ensures a desirable environmental footprint for the carrier substrate, because there is no need to process new plants; instead, previously used carrier substrates can be reprocessed in a closed-loop system. Virgin fibers produced from new plants may make up a lower proportion in the carrier substrate than recycled fibers.

[0100] According to one embodiment, the carrier substrate is 20 g / m² 2 From 120g / m 2 It has a basis weight of preferably 40 g / m². 2 From 100g / m 2 It has a basis weight of [amount].

[0101] This achieves a technical advantage in that the basis weight of the carrier substrate mentioned above ensures that the packaging material possesses favorable properties.

[0102] According to one embodiment, the carrier substrate is selected from the group including uncoated paper, single-sided coated paper, and double-sided coated paper.

[0103] This achieves the technical advantage of allowing for the advantageous selection of carrier substrates according to the desired application of environmentally friendly packaging materials.

[0104] According to one embodiment, at least one polymer binder of at least one first coating color layer and / or at least one second coating color layer is selected from the group including natural binders, modified natural binders, synthetic binders, other binders and mixtures thereof, preferably a) The natural binder is selected from the group comprising natural polymers, more preferably natural cellulosic polymers, even more preferably cellulose, natural lignin-based polymers and / or natural starch-based polymers, more preferably starch, protein, more preferably casein, polysaccharides, more preferably pullulan, chitosan and / or alginic acid, and mixtures thereof; b) The modified natural binder is selected from the group comprising modified starch, carboxymethylcellulose, hydroxyethylcellulose, and mixtures thereof; c) The synthetic binder is selected from the group comprising butadiene styrene, styrene acrylate, butadiene acrylonitrile, butadiene methyl methacrylate and mixtures thereof, more preferably styrene acrylate; and d) The other binder is selected from the group comprising acrylic acid esters, polyvinyl alcohol, polyvinyl acetate and mixtures thereof, more preferably polyvinyl alcohol.

[0105] This achieves the technical advantage that the corresponding polymer binder enables the favorable production of at least one first and / or second coating color layer and ensures favorable barrier properties of at least one first and / or second coating color layer.

[0106] According to one embodiment, at least one first coating color layer contains at least one polymer binder in an amount of 1% to 70% by weight, preferably 5% to 50% by weight, based on the dry mass of each of the at least one first coating color layer; and / or, at least one second coating color layer contains at least one polymer binder in an amount of 1% to 70% by weight, preferably 5% to 50% by weight, based on the dry mass of each of the at least one second coating color layer.

[0107] This achieves a technical advantage in that, through the weight ratio of the corresponding polymer binder, at least one advantageous first coating color layer or at least one advantageous second coating color layer can be obtained.

[0108] According to one embodiment, at least one inorganic pigment in at least one first coating color layer and / or at least one second coating color layer is selected from the group comprising calcined kaolin, kaolin, kaolinite, hydrated magnesium silicate, silicon dioxide, bentonite, calcium carbonate, aluminum hydroxide, aluminum oxide, bauxite, aluminum sulfate, titanium dioxide, barium sulfate, talc, and mixtures thereof, preferably calcined kaolin, kaolinite, talc, and / or calcium carbonate, particularly pulverized calcium carbonate (GCC) and / or precipitated calcium carbonate (PCC), and most preferably pulverized calcium carbonate (GCC) and / or precipitated calcium carbonate (PCC) and / or kaolin.

[0109] This offers the technical advantage of achieving favorable properties in the first and / or second coating color layers using corresponding inorganic pigments.

[0110] According to one embodiment, at least one first coating color layer contains 50% to 95% by weight, preferably 80% to 90% by weight, of at least one inorganic pigment, based on the dry mass of each of the at least one first coating color layer; and / or at least one second coating color layer contains 50% to 95% by weight, preferably 80% to 90% by weight, of at least one inorganic pigment, based on the dry mass of each of the at least one second coating color layer.

[0111] This achieves the technical advantage that the corresponding weight ratio of the inorganic pigment ensures that the first and / or second coating color layers have favorable properties.

[0112] According to one embodiment, the ratio of polymer binder to inorganic pigment in at least one first coating color layer is 1:5 to 5:1, preferably 1:4 to 4:1, more preferably 1:3 to 3:1, even more preferably 1:2 to 2:1, and most preferably about 1:1, and / or the ratio of polymer binder to inorganic pigment in at least one second coating color layer is 1:4 to 4:1, preferably 1:4 to 1:2, and most preferably 1:4 to 1:3.

[0113] This achieves a technical advantage in that the corresponding ratio of polymer binder to inorganic pigment enables favorable properties of the first and / or second coating color layers.

[0114] Preferably, the inorganic pigment of at least one first coating color layer and / or second coating color layer is formed in a platelet-like form.

[0115] According to one embodiment, at least one inorganic pigment in at least one first coating color layer and / or at least one second coating color layer has an aspect ratio of 5:100, preferably 15:100, and more preferably 20:80.

[0116] According to one embodiment, at least one inorganic pigment in at least one first coating color layer and / or at least one second coating color layer has a particle size distribution of 0.5 μm to 3.0 μm.

[0117] According to one embodiment, the third coating color layer comprises at least one polysaccharide, at least one rheological aid, at least one Sealcoat MB46HE, and a mixture thereof, preferably a) At least one polysaccharide is selected from the group comprising hemicellulose, cellulose, starch, alginic acid, chitosan, pullulan, dextran, agarose and mixtures thereof, more preferably pullulan, chitosan and / or alginic acid, and most preferably exclusively pullulan; b) At least one rheological adjuvant is selected from the group including: b-1) Sugar alcohols selected from the group including diglycerol, triglycerol, fructose, ribose, xylose, D-mannitol, triacetin, and mixtures thereof: b-2) Polyols selected from the group comprising pentaerythritol, dipentaerythritol, polyvinyl alcohol, xylitol, sorbitol and mixtures thereof, more preferably xylitol and / or sorbitol, and most preferably xylitol; b-3) Diols selected from the group comprising methylpentanediol, 1,2-propanediol, 1,4-butanediol, 2-hydroxy-1,3-propanediol, 3-methyl-1,3-butanediol, 3,3-dimethyl-1,2-butanediol, and mixtures thereof; b-4) Glycols selected from the group comprising polyethylene glycol 300, polyethylene glycol 400, alkoxylated polyethylene glycol, and mixtures thereof; b-5) Caprolactam, cyclotrimethylolpropane, resin esters, erucamide and mixtures thereof, This includes mixtures of subgroups b-1) to b-5).

[0118] This achieves the technical advantage of ensuring a desirable compromise between the optimal viscosity of the third coating color for production and the corresponding drying properties of the applied third coating color layer by using at least one polysaccharide in the third coating color layer. It also achieves the technical advantage of enabling its application on a large-scale industrial basis, as the rheological additives are environmentally friendly and ensure a favorable viscosity setting for the third coating color.

[0119] In particular, the third coating color layer is a sealing layer and contains at least one thermoplastic polymer. Such a sealing layer is especially useful when at least one hydrophobic polymer in the third coating color layer does not contain a thermoplastic polymer, i.e., it is not heat-sealable.

[0120] The sealing layer preferably comprises a thermoplastic polymer based on polyacrylate, a styrene / butadiene copolymer, and / or a polyolefin. Preferred polymers include, in particular, acrylates, polymethacrylates, polymethyl acrylates, polymethyl methacrylates, polyethyl acrylates, polyethyl methacrylates, poly(n-, iso-, tert-)butyl acrylates, poly(n-, iso-, tert-)butyl methacrylates, polycyclohexyl methacrylates, polyethylhexyl acrylates and their copolymers, graft polymers, and copolymers with styrene, acrylonitrile, methylstyrene, and / or vinyltoluene. Suitable polymers are known, in particular, under the trademarks Vapor Coat 1300, BimBA 8888, Cartaseal SWF, Rhobarr 320, B-Coat WB 100, B-Coat 50 / 3, Chemipearl S300, Ultraseal W-952, Wukoseal 630, EurikaCoat 3624, Epotal SP 106, Hypod 2000, Extomine BS-OF 40%, Aquaseal X2200, Cartaseal SCR, CHT Coat 8080, Sealcoat MB46HE, and Extomine BG-EM 48%.

[0121] According to one embodiment, at least one polysaccharide in the third coating color layer has a number average degree of polymerization X n The number mean of the degree of polymerization is at least 150, where X n This is determined by the following formula:X n =M n / M m , here, M n This corresponds to the number average of the molar masses of at least one polysaccharide, M m This corresponds to the molar mass of at least one monomer unit of a polysaccharide.

[0122] According to one embodiment, at least one polysaccharide in the third coating color layer has a number average degree of polymerization X nThe value is at least 175, preferably at least 200, more preferably at least 250, even more preferably at least 300, even more preferably at least 400, even more preferably at least 500, even more preferably at least 600, even more preferably at least 700, and most preferably at least 800.

[0123] This is the number average of the degree of polymerization of at least one polysaccharide X n This is desirable, thereby achieving the technical advantage of ensuring favorable manufacturability of the third coating color layer, because the third coating color layer ensures that the corresponding third coating produced from it has a favorable viscosity. Furthermore, this has a favorable effect with respect to the gas barrier properties of the third coating color layer.

[0124] According to one embodiment, at least one polysaccharide in the third coating color layer has different average degrees of polymerization X n It holds.

[0125] According to one embodiment, at least one polysaccharide in at least one third coating color layer has a number-average molar mass M n is 1 x 10 5 g / mol and 8 × 10 5 The concentration is between g / mol, preferably 2 × 10⁻⁶. 5 g / mol and 6 × 10⁻⁶ 5 The range is between g / mol, most preferably 3 × 10 5 g / mol and 4 × 10⁻⁶ 5 It is between g / mol.

[0126] According to one embodiment, the third coating color layer contains at least one rheological auxiliaries, particularly polyols, in an amount of 10% to 95% by weight, preferably 2% to 35% by weight, more preferably 5% to 25% by weight, and most preferably 10% to 20% by weight, based on the total dry mass of the third coating color layer.

[0127] This achieves a technical advantage in that a predetermined weight ratio of at least one rheological auxiliaries, particularly polyols, in the third coating color for the production of the third coating color layer allows for the setting of a favorable viscosity. Furthermore, the rheological auxiliaries, particularly polyols, act as plasticizers.

[0128] According to one embodiment, the third coating color layer contains at least one polysaccharide in an amount of 10% to 95% by weight, preferably 10% to 40% by weight, more preferably 10% to 25% by weight, even more preferably 10% to 19.9% ​​by weight, even more preferably 12% to 18% by weight, and most preferably 15% to 18% by weight, based on the total dry mass of the third coating color layer.

[0129] This achieves the technical advantage that a desirable compromise is ensured between the optimal viscosity of the third coating color for the production of the third coating color layer and the corresponding drying properties of the applied third coating color, depending on the corresponding weight range of at least one polysaccharide.

[0130] According to one embodiment, a polysaccharide, preferably pullulan, is present in a crystalline or semi-crystalline form in the third coating color layer to provide a barrier layer, which provides a particularly high barrier effect against fats, oxygen, and aromatic substances.

[0131] This achieves the technical advantage that the crystalline or semi-crystalline structure of the polysaccharide or pullulan provides a favorable barrier within the third coating color layer.

[0132] According to one embodiment, the third coating color layer contains polyvinyl alcohol as a rheological aid, where the third coating color layer preferably contains only polyvinyl alcohol.

[0133] This achieves the technical advantage of obtaining a favorable third coating color layer.

[0134] According to one embodiment, the environmentally friendly packaging material comprises up to 5% by weight, more preferably up to 2.5% by weight, even more preferably up to 1% by weight, more preferably up to 0.1% by weight, and most preferably up to 0.01% by weight of plastic, where plastic is defined as a polymer that can function as a main structural component of the final product, and may have additives and other substances added, but excludes naturally occurring polymers that have not been chemically modified.

[0135] This results in a technical advantage: environmentally friendly packaging materials can be favorably recycled due to their very low plastic content.

[0136] According to one embodiment, the environmentally friendly packaging material has first, second, and third coating color layers, based on the total weight of the environmentally friendly packaging material, comprising up to 50% by weight, preferably up to 40% by weight, more preferably up to 30% by weight, and most preferably up to 15% by weight.

[0137] This achieves a technical advantage in that it favorably reduces the production cost of environmentally friendly packaging materials by using the first, second, and third coating color layers with low weight ratios.

[0138] According to one embodiment, the first and / or second and / or third coating color layer comprises at least one auxiliary substance, wherein the at least one auxiliary substance preferably comprises a natural surfactant and most preferably a saponin and / or a phospholipid.

[0139] In particular, the surfactant contains a water-soluble nonionic ethoxylated alcohol, with a solid content between 4% and 15%, and the surfactant is preferably of the formula RO(CH2CH2O) x It has H, where the substituent R is iso-C 13 H 27 Selected as such, with substituent x being 8 or more; or substituent R being iso-C 10 Selected as such, the substituent x is selected from the group containing 5, 6, 7, 8, or 11.

[0140] According to one embodiment, the natural surfactant is present in an amount of 0.05% to 3% by weight, preferably 0.1% to 1.0% by weight, based on the total dry mass of each coating color layer.

[0141] This achieves the technical advantage of obtaining advantageously uniform first, second, or third coating colors for the production of first, second, or third coating color layers.

[0142] According to one embodiment, at least one first coating color layer and / or at least one second coating color layer and / or at least one third coating color layer contains at least one additive selected from the group consisting of viscosity modifiers, preferably viscosity reducers such as dicyandiamide, polyethylene glycol and / or urea, or preferably viscosity increasers such as alginic acid, carboxymethylcellulose and / or acrylic acid esters; dispersants, preferably salts of polyphosphate, sodium triphosphate, sodium pyrophosphate and / or polycarboxylic acid; defoamers; wetting strength enhancers, preferably melamine formaldehyde resin, urea formaldehyde resin, formalin and / or glyoxal; preservatives, preferably antimicrobial additives and / or antifungal additives; lubricants, preferably polyglycol; pH adjusters, preferably sodium hydroxide and / or ammonia; dyes; fluorescent whitening agents; conductive agents and mixtures thereof.

[0143] According to one embodiment, at least one additive is present in the first, second and / or third coating color layers in an amount ranging from 0.01% to 5% by weight, preferably from 0.1% to 2% by weight, based on the respective dry mass of each coating color layer.

[0144] This achieves a technical advantage in that it enables favorable optimization of the applicability and / or properties of at least one first and / or second and / or third coating color layer.

[0145] According to one embodiment, at least one third coating color layer comprises an inorganic pigment, which is preferably selected from the group comprising natural calcium carbonate (GCC, pulverized calcium carbonate), precipitated calcium carbonate (PCC), aluminum oxide, aluminum hydroxide, silica, particularly precipitated and calcined silica, diatomaceous earth, magnesium carbonate, titanium oxide, bentonite, and clay, and is preferably clay, talc, or kaolin.

[0146] Preferably, the inorganic pigment of at least one third coating color layer is formed in a platelet-like form.

[0147] According to one embodiment, at least one inorganic pigment of at least one third coating color layer has an aspect ratio of 5:100, preferably 15:100, and more preferably 20:80.

[0148] According to one embodiment, at least one inorganic pigment in at least one third coating color layer has a particle size distribution of 0.5 μm to 3.0 μm.

[0149] According to one embodiment, at least one third coating color layer has a pigment volume concentration (PVC) lower than the critical pigment volume concentration (CPVC) in order to obtain a continuous three-dimensional film.

[0150] Preferably, the pigment volume concentration (PVC) is 5% to 55% by volume, and particularly 15% to 30% by volume.

[0151] Preferably, the critical pigment volume concentration (CPVC) is 50% to 70% by volume, and particularly 55% to 65% by volume.

[0152] This results in a third coating color layer having a relatively low pigment volume concentration (PVC) below the critical pigment volume concentration (CPVC), allowing the binder to effectively embed the pigment within the third coating color layer, thereby achieving the technical advantage of a continuous third coating color layer without visible voids. This layer nevertheless possesses advantageous properties. For further details, see WO2022 / 103458 A1.

[0153] According to one embodiment, the inorganic pigment of at least one third coating color layer is present in a range of 1% to 30% by weight, preferably 2% to 30% by weight, based on the total dry mass of the third coating color layer.

[0154] This achieves a technical advantage in that the addition of inorganic pigments enables a particularly favorable viscosity for the third coating color, thereby improving the processability of the third coating color when manufacturing the third coating color layer.

[0155] According to one embodiment, at least one third coating color layer is polymer-free, and in particular casein-free.

[0156] According to one embodiment, the environmentally friendly packaging material is conforming as a food-safe, environmentally friendly packaging material, where the food-safe, environmentally friendly packaging material particularly satisfies standards EN1186 and / or EN13130.

[0157] European standards EN1186 and / or EN13130 ​​establish clear rules regarding the acceptable migration of packaging material components into food. Since the food-grade packaging materials according to the present invention conform to the relevant standards, sufficient food safety is guaranteed.

[0158] According to one embodiment, the packaging material is adapted as a foldable packaging material.

[0159] This achieves the technical advantage that the foldable packaging material can be easily and advantageously folded around the product to be packaged during the packaging process, and further, the technical advantage that the correspondingly folded packaging material retains its folded shape after the packaging process, ensuring effective packaging of the product to be packaged.

[0160] According to one embodiment, the environmentally friendly packaging material has a basis weight of 150 g / m². 2 Smaller than 120 g / m², preferably 120 g / m² 2 Smaller than that, and even more preferably 100g / m² 2 Smaller than this, where the basis weight of the environmentally friendly packaging material is most preferably 70 and 80 g / m². 2 It is between these two points.

[0161] This achieves a technical advantage in obtaining a favorable packaging material suitable for use as wrapping paper.

[0162] According to one embodiment, each of the first and / or second and / or third coating color layers has a basis weight of 20 g / m². 2 Smaller than 15 g / m², preferably 15 g / m² 2 Smaller than the first and / or second coating color layer, each preferably has a basis weight of 3 g / m². 2 From 15g / m 2 That is the case.

[0163] This achieves the technical advantage of providing an effective first and / or second and / or third coating color layer. The correspondingly lower basis weight of the first and / or second and / or third coating color layer ensures, in particular, that there are fewer soluble components available in the overall packaging material.

[0164] In particular, at least one first coating color layer and / or at least one second coating color layer have a basis weight of 10 g / m². 2 Smaller than 8 g / m², preferably 8 g / m² 2 Smaller than 4 g / m², most preferably 4 g / m² 2 That is the case.

[0165] In particular, the basis weight of at least one first coating color layer is 1 g / m². 2 From 10g / m 2 Preferably 2 g / m 2 From 6g / m 2 That is the case.

[0166] In particular, the basis weight of at least one second coating color layer is 5 g / m². 2 From 20g / m 2 Preferably 8 g / m 2 From 12g / m 2 That is the case.

[0167] In particular, at least one third coating color layer has a basis weight of 20 g / m². 2 Smaller than 15 g / m², preferably 15 g / m² 2 Smaller than and at least one third coating color layer, most preferably 3 g / m² 2 From 15g / m 2 This is the basis weight.

[0168] According to one embodiment, at least one third coating color layer comprises at least one preservative, the preservative preferably comprising a diol, most preferably bronopol.

[0169] This achieves the technical advantage of longer durability for at least one third coating color layer.

[0170] Preferably, at least one third coating color layer does not contain dozine and / or guanidine salts as preservatives, however, unavoidable trace amounts of dozine and / or guanidine salts may be present in at least one third coating color layer.

[0171] This makes it possible to meet particularly stringent environmental standards, such as Demeter-compliant packaging.

[0172] According to one embodiment, the environmentally friendly packaging material has at least one intermediate layer disposed between at least one second coating color layer and at least one third coating color layer.

[0173] In particular, at least one intermediate layer comprises at least one binder and at least one pigment, in particular at least one inorganic pigment.

[0174] This achieves a technical advantage in that, depending on the material selection, the intermediate layer can favorably improve the structural stability and barrier effect of the packaging material.

[0175] The same preferred selections apply to the inorganic pigments and binders of the intermediate layer as to the inorganic pigments and binders of the first and second coating color layers.

[0176] According to one embodiment, the environmentally friendly packaging material has at least one coating layer located on the outside of at least one third coating color layer.

[0177] According to one embodiment, the coating layer comprises at least one of the following components selected from coating color, ink, sealing medium, and adhesive.

[0178] The packaging material according to the present invention may be metallized in the nanometer range, for example, with Al2O3 or Al. Preferably, the packaging material according to the present invention is further characterized in that at least one coating layer contains a metal, particularly aluminum, and / or a metal oxide, particularly aluminum oxide and / or silicon oxide.

[0179] The additional layer can, in particular, reduce the permeability of the packaging material according to the present invention to other gases and / or form a barrier to liquids or viscous substances such as fats, oils, and hydrocarbons.

[0180] At least one coating layer, in particular: a) For example, it may include at least one hydrophobic polymer based on polyacrylate, styrene / butadiene copolymer and / or polyolefin; b) may include, for example, at least one hydrophilic polymer based on polyvinyl alcohol; c) May comprise at least one inorganic pigment and one binder; d) May include amorphous and crystalline regions; e) may contain or consist of substances selected from the group including lipophilic substances, paraffins, especially hard paraffins, waxes, especially microcrystalline waxes, waxes based on vegetable oils or fats, vegetable waxes, animal waxes, low molecular weight polyolefins, polyterpenes, and mixtures thereof; f) To reduce or prevent the migration of substances, especially hydrophobic substances (e.g., the substances described in item e) above), for example, to prevent or reduce the migration of substances from the base layer to food, especially fatty foods; g) At least heat-sealable or cold-sealable; h) May include at least one adhesive; i) may include or consist of at least one thermoplastic material, in particular a heat-sealable material.

[0181] This achieves the technical advantage of ensuring that the coating layer effectively protects the third coating color layer from external influences.

[0182] According to one embodiment, at least one first, second, and third coating color layer is located on the first side of the carrier substrate of the environmentally friendly packaging material, and in particular, the back side coating color layer is located on the second side of the carrier substrate.

[0183] In particular, at least one back-side coating color layer includes a starch layer.

[0184] This achieves the technical advantage that the back coating color layer allows for the possibility of labeling or printing on the back side or second side of the carrier substrate of the environmentally friendly packaging material.

[0185] According to one embodiment, the environmentally friendly packaging material is suitable as an unbonded environmentally friendly packaging material, as an environmentally friendly packaging material with one side bonded, and / or as an environmentally friendly packaging material with both sides bonded, wherein this bonding particularly includes starch bonding.

[0186] According to one embodiment, the carrier substrate is particularly suited as a satin-finish carrier substrate.

[0187] Manufacturing methods for environmentally friendly packaging materials According to a second aspect, the present invention relates to a method for manufacturing an environmentally friendly packaging material, comprising the following process steps: A step of providing a carrier substrate having a first side and a second side facing away from the first side; The step of placing at least one first coating color layer on the first and / or second side of a carrier substrate, wherein the at least one first coating color layer comprises at least one inorganic pigment and at least one polymer binder, or the at least one first coating color layer comprises at least one polymer binder and does not contain an inorganic pigment; A step of drying at least one first coating color layer in order to obtain at least one dried first coating color layer disposed on the first and / or second side of the carrier substrate; A step of directly applying at least one second coating color layer to at least one dried first coating color layer, wherein the at least one second coating color layer comprises at least one inorganic pigment and at least one polymer binder, or wherein the at least one second coating color layer comprises at least one polymer binder and does not contain an inorganic pigment; A step of drying at least one second coating color layer in order to obtain at least one dried second coating color layer placed on at least one dried first coating color layer; The steps include: applying at least one third coating color indirectly or directly to at least one dried second coating color layer; and To obtain at least one third coating color layer to be placed on at least one dried second coating color layer, the step involves drying at least one third coating color, where the third coating color layer is a barrier layer and / or a sealable layer.

[0188] This achieves a technical advantage in that it provides a favorable production of environmentally friendly packaging materials.

[0189] According to one embodiment, the application of at least one first coating color and / or at least one second coating color and / or at least one third coating color is performed by a large-scale industrial coating machine, which has a production speed particularly higher than 1000 meters / minute.

[0190] This offers a technical advantage: large quantities of packaging materials can be supplied in a short amount of time.

[0191] According to one embodiment, the application of the first and / or second and / or third coating color is carried out by a curtain coating process or a doctor blade coating process.

[0192] The application of the first and / or second and / or third coating color is preferably carried out using a double-curtain coating process in which the operating speed of the coating machine is at least 200 m / min.

[0193] This process is particularly advantageous from an economic standpoint because it results in uniform application across the entire paper web.

[0194] In a curtain coating process, a curtain of freely falling coating dispersions is formed. The coating dispersions are in the form of thin films (curtains) and are "poured" onto a substrate by free fall in order to coat it with the substrate. DE10 196 052 TI discloses the use of a curtain coating process in the production of information recording materials, in which a multilayer recording layer is realized by coating a substrate with a curtain consisting of multiple coating dispersion films.

[0195] According to one embodiment, drying of the first and / or second and / or third coating color is carried out at a temperature between 20°C and 300°C, preferably between 90°C and 140°C, and most preferably between 105°C.

[0196] According to one embodiment, the drying of the first and / or second and / or third coating color is carried out over a period of 10 seconds to 15 minutes, preferably 1 minute to 5 minutes, most preferably 2 minutes 30 seconds or 3 minutes.

[0197] According to one embodiment, the drying of the first and / or second and / or third coating color is carried out at a curing pressure of 0.2 bar (0.02 MPa) to 3 bar (0.3 MPa), preferably at a curing pressure of 0.9 bar (0.09 MPa) to 1.1 bar (0.11 MPa).

[0198] According to one embodiment, the first and / or second and / or third coating color is degassed under stirring for a period of 2 to 10 minutes, preferably 4 minutes, before application.

[0199] According to one embodiment, the application of the first and / or second and / or third coating color layer is carried out at a temperature between 15°C and 30°C.

[0200] According to one embodiment, after applying the first and / or second and / or third coating color, the application weight of each of the first and / or second and / or third coating colors is at least 6 g / m². 2 This is achieved.

[0201] The embodiments listed for the packaging material according to the first aspect are also embodiments for the manufacturing method of the packaging material according to the second aspect, and vice versa.

[0202] Environmentally friendly packaging materials that can be manufactured using this method According to a third aspect, the present invention is solved by an environmentally friendly packaging material that can be manufactured by the method according to the second aspect.

[0203] The embodiments listed for the packaging material according to the first embodiment and the manufacturing method of the packaging material according to the second embodiment are also embodiments for the packaging material according to the third embodiment.

[0204] Use of environmentally friendly packaging materials According to the fourth aspect, the present invention is solved by using environmentally friendly packaging materials according to the first and / or third aspects, particularly for packaging consumer goods, food products, electronic products and / or tobacco products.

[0205] Packaging includes, in particular, wrapping, tube bags, lids on cups, or trays.

[0206] In particular, the packaging is suitable as inner packaging and can be used, for example, as a substitute for metallized inner packaging.

[0207] The packaging is suitable for a variety of applications in the tobacco industry, particularly for demanding tobacco products. It can be used as both secondary and primary packaging for tobacco products, such as bulk tobacco volume bags, tobacco pouches, and coating barriers for tobacco inner liners.

[0208] The embodiments listed with respect to the packaging material according to the first embodiment and the manufacturing method of the packaging material according to the second embodiment are also embodiments of the use of the packaging material according to the fourth embodiment.

[0209] Third coating color According to a fifth aspect, the present invention relates to a third coating color for indirectly or directly coating a second coating color layer applied to a first coating color layer, wherein the first coating color layer is applied to a carrier substrate, and the third coating color comprises, based on the total dry mass of the third coating color, 10% to 95% by weight of at least one polysaccharide; based on the total dry mass of the third coating color, 10% to 90% by weight of at least one rheological auxiliaries, particularly polyols; and at least one liquid, particularly water; the third coating color has a viscosity between 150 mPas and 1300 mPas, the viscosity of the third coating color being determined by the weight ratio of the at least one polysaccharide to the at least one rheological auxiliaries, particularly polyols.

[0210] This achieves the technical advantage that the corresponding third coating color is particularly suitable for the production of environmentally friendly packaging materials with advantageous barrier properties.

[0211] By setting the viscosity of the third coating color between 150 mPas and 1300 mPas, based on the weight ratio of at least one polysaccharide to at least one rheological auxiliaries, particularly polyols, it is possible to ensure a very high production throughput of manufactured packaging materials by using large-scale industrial coating machines, depending on the type of coating used.

[0212] Furthermore, the third coating color can be used in a coating curtain process, which is only possible when the viscosity of the applied coating color is very low, due to its advantageously set viscosity characteristics.

[0213] According to one embodiment, the viscosity of the third coating color is determined by the weight ratio of at least one polysaccharide to at least one rheological aid, particularly a polyol, and the viscosity of the coating color is the number average of the degree of polymerization X n It is set by at least one different polysaccharide.

[0214] This offers the technical advantage of achieving viscosity adjustment of the third coating color, as the viscosity of the third coating color can be set not only by adding at least one polysaccharide and at least one rheological aid, particularly a polyol, in different weight ratios, but also by changing the degree of polymerization ratio of at least one polysaccharide.

[0215] According to one embodiment, the viscosity of the third coating color is between 200 mPas and 400 mPas or between 800 mPas and 1300 mPas.

[0216] This achieves the technical advantage that a viscosity of the third coating color between 200 mPas and 400 mPas allows the third coating color to be used in the curtain coating process, and a viscosity of the third coating color between 800 mPas and 1300 mPas allows the third coating color to be used in the doctor blade coating process.

[0217] According to one embodiment, at least one polysaccharide of the third coating color has a number average degree of polymerization X n The number mean of the degree of polymerization is at least 150, where X n This is determined by the following formula: X n =M n / M m , here, M n This corresponds to the number average of the molar masses of at least one polysaccharide, M m This corresponds to the molar mass of at least one monomer unit of a polysaccharide.

[0218] According to one embodiment, the third coating color is in the form of an aqueous solution, an aqueous dispersion, or an aqueous emulsion.

[0219] According to one embodiment, the weight fraction of at least one polysaccharide of the third coating color is such that after drying the third coating color, the paper coated with the third coating color obtains a third coating color layer and at the same time satisfies at least one, preferably at least two, more preferably at least three, even more preferably at least four, even more preferably at least five, even more preferably at least six, even more preferably at least seven, even more preferably at least eight of the conditions defined below: a) The roughness of the environmentally friendly packaging material is 1 μm to 10 μm, preferably 1 μm to 8 μm, more preferably 2 μm to 6 μm, and most preferably 3 μm to 5 μm; b) The oxygen permeability at a temperature of 23 °C ± 2 °C and a relative humidity of 0% according to the standard DIN ISO 15105-2 is less than 10 cm 3 / m 2 / day, preferably less than 8 cm 3 / m 2 / day, more preferably less than 5 cm 3 / m 2 / day, and most preferably less than 1 cm 3 / m 2 / day; c) The water vapor transmission rate according to the standard ISO 535 is less than 30 g / m 2 preferably 25 g / m 2 ; d) The fold resistance of the outer fold of the environmentally friendly packaging material after folding at a load of 330 g / cm, and / or the fold resistance of the inner fold of the environmentally friendly packaging material after folding at a load of 330 g / cm; e) Grease resistance according to the standard DIN 53116; f) Aroma resistance by the hexane vapor transmission test (HVTR) is less than 10 g / m 2 / day; g) The KIT value determined by standard Tappi T 559 is greater than 6, preferably greater than 8, more preferably greater than 10, and most preferably 12 or greater; h) Sealing performance according to standard DIN55529 (2012).

[0220] The embodiments listed with respect to the packaging material according to the first embodiment, the embodiments listed with respect to the method for manufacturing the packaging material according to the second embodiment, and the embodiments listed with respect to the use of the packaging material according to the fourth embodiment are also embodiments with respect to the third coating color according to the fifth embodiment, and vice versa.

[0221] Figures 1 and 2 Please refer to the attached Figure 1, which shows a schematic representation of the environmentally friendly packaging material according to the present invention.

[0222] As defined in the first aspect of the present invention and as shown in Figure 1, an environmentally friendly packaging material includes a carrier substrate, the carrier substrate having a first side (also called the front side) and a second side (also called the back side) facing away from the first side.

[0223] The invention further includes at least one first coating color layer positioned on the first and / or second side of the carrier substrate, and Figure 1 shows only variations of the arrangement of at least one first coating color layer on the first side (front side) of the carrier substrate. Alternatively or in addition, the invention also includes the arrangement of at least one first coating color layer on the second side (back side) of the carrier substrate. Although Figure 1 shows only variations of a single first coating color layer, the invention naturally also includes variations of multiple first coating color layers, with one layer positioned on top of another.

[0224] The invention further includes at least one second coating color layer applied directly to at least one first coating color layer, i.e., without an intermediate layer, and Figure 1 shows only variations of the arrangement of at least one second coating color layer on the first side (front side) of the carrier substrate. Alternatively or in addition, the invention also includes arrangements of at least one second coating color layer placed directly on the corresponding first coating color layer on the second side (back side) of the carrier substrate. Although Figure 1 shows only variations of a single second coating color layer, the invention naturally also includes variations of multiple second coating color layers, one on top of another.

[0225] The invention further includes at least one third coating color layer applied directly to at least one second coating color layer, i.e., without an intermediate layer in between, or indirectly, i.e., via an intermediate layer in between, where Figure 1 shows only variations of the arrangement of at least one third coating color layer on the first side (front side) of the carrier substrate. Alternatively or in addition, the invention also includes arrangements of at least one third coating color layer placed directly or indirectly on the corresponding second coating color layer on the second side (back side) of the carrier substrate. Although Figure 1 shows only variations of a single third coating color layer, the invention naturally also includes variations of multiple third coating color layers, one on top of another.

[0226] As shown in Figure 1, the environmentally friendly packaging material according to the present invention optionally includes a back layer disposed on the second side (back side) of the carrier substrate, in which case at least one first, second, and third coating color layer is disposed on the first side (front side) of the carrier substrate.

[0227] Figures 2A to 2L show visual representations of the surface of the first coating color layer applied to a carrier substrate and dried, the surface of which was pretreated by a burnout test and then subjected to image analysis using ImageJ software.

[0228] example In the comparative examples and embodiments described in detail below, different packaging materials are manufactured by applying an aqueous solution of the respective coating color to a carrier substrate to form a composite structure with the corresponding coating color layer, and such packaging materials or composite structures are subsequently referred to as "coated paper." Furthermore, the parameters of the corresponding packaging materials were also investigated and evaluated in the comparative examples and embodiments described in detail below.

[0229] Measurement method The following measurement methods were used in the experiments described in detail below.

[0230] The basis weight or coating weight of each layer was determined by weighing the difference between the uncoated carrier substrate and the carrier substrate coated with the layer.

[0231] Viscosity was determined using a Brookfield viscometer at 23°C and a speed of 100 rpm, with a dry content of 4%.

[0232] The oxygen permeability (OTR) of each packaging material was determined at room temperature (23°C ± 2°C) according to the standard DIN ISO 15105-2.

[0233] The fold resistance of the outer or inner folds of each packaging material was determined by visual analysis of the outer or inner folds using a scanning electron microscope after bending them under a load of 330 g / cm.

[0234] The grease resistance of each packaging material was tested using the palm kernel oil grease test in accordance with standard 513116.

[0235] The aroma resistance of each packaging material was determined by gravimetric measurement of hexane vapor transmission rate (HVTR) based on a hexane permeability test over a 24-hour period. The hexane vapor transmission test (HVTR) was performed gravimetrically using a beaker according to standard DIN 53122-1, with the beaker filled with n-hexane and the sample fixed in the beaker with its coating side facing the n-hexane. Hexane loss was determined by repeatedly weighing the beaker over a defined area over a 24-hour period.

[0236] The water vapor transmission rate of each packaging material was determined according to the ISO 15106-2 standard.

[0237] The KIT value for each packaging material was determined according to the Tappi T 559 standard.

[0238] The sealing properties of each packaging material were determined according to standard DIN 55529 (2012), where coated paper was sealed perpendicular to the grain direction at a temperature range of 100°C to 200°C at 3.3 bar for 0.3 seconds, and the seal strength was measured.

[0239] When a qualitative evaluation of parameters determined using relevant measurement methods is performed, the evaluation is based on the classification of "Poor (-)", "Average (0)", "Good (+)", or "Very Good (++)", respectively.

[0240] Manufacturing process To produce each packaging material, a suitable coating color in an amount of 5-10 ml was applied at room temperature to the first side of a cellulose DIN A3 size carrier substrate using an Errixen (RK K303 multi-coater) film pulping apparatus with a doctor blade. The doctor blade used and, consequently, the wet film application were adjusted to the dry mass of the coating color to achieve the desired coating weight of each coating color layer.

[0241] After the application of each coating color, the packaging material was fixed to the cardboard with a magnet to prevent the paper from rolling up and dried in a convection oven manufactured by Memmert (settings: 50% flap; 50% fan) at a temperature of 105°C for a period of 3 minutes to obtain the corresponding coating color layer.

[0242] When multiple coating color layers are applied to the carrier substrate, the corresponding coating and drying processes were repeated in order to apply each coating color layer sequentially to the carrier substrate or to each previously applied dried coating color layer.

[0243] Here, at least one first coating color layer directly applied to the carrier substrate contains at least one polymer binder such as styrene acrylate and at least one inorganic pigment such as pulverized calcium carbonate, or contains at least one polymer binder such as styrene acrylate and does not contain an inorganic pigment. After drying, the at least one first coating color directly applied forms the first coating color layer.

[0244] At least one second coating color is directly applied to the at least one dried first coating color layer according to the experiments described below and then dried to obtain at least one second coating color layer.

[0245] At least one third coating color is directly or indirectly applied to the at least one dried second coating color layer according to the experiments described below and then dried to obtain at least one third coating color layer.

[0246] The polysaccharides used in the exemplary embodiments for the third coating color exclusively include "food grade" pullulan obtained from Hayashibara Co., Ltd. and used without pretreatment.

[0247] The polyvinyl alcohol designated Baumeister HS 25 used in the exemplary embodiment for the third coating color was purchased and used without pretreatment. The substance designated MB46HE used in the exemplary embodiment for the third coating color was purchased and used without pretreatment.

[0248] To prepare the third coating color, pullulan was dissolved in distilled water while stirring, and at least one polyol, particularly xylitol and / or sorbitol, was added depending on the specific experiment. The third coating color was then degassed for 4 minutes using a Hauschild speed mixer at a stirring speed of 2000 revolutions per minute.

[0249] Baumeister HS 25 and the specified polyvinyl alcohol substance MB46HE were applied directly to the second coating color layer.

[0250] Evaluation of at least one first coating color layer using burnout tests and image analysis. Before at least one second coating color layer is applied to at least one first coating color layer, sample pretreatment is performed, particularly using a burnout test, and then image analysis is performed using the freeware software ImageJ to enable evaluation of the surface quality of at least one first coating color layer.

[0251] Sample preprocessing using burnout tests:

[0252] First, using a smooth doctor blade, 10% ammonium chloride reagent is applied to at least one first-coating color layer of a dry, A4-sized paper sample. To evaluate pigment application, the reagent is applied to the side with the first-coating color layer. After the reagent is absorbed by the paper, the paper fibers are carbonized in a drying oven at approximately 200°C for 2–5 minutes. During this process, the paper fibers blacken. Fibers covered with white pigment are not visible as dark spots, while uncovered paper fibers appear dark. The heat is applied uniformly across the entire surface of the sample paper to prevent uneven blackening.

[0253] Image analysis using ImageJ (freeware software):

[0254] The pre-processed A4-sized test sheet is scanned at a resolution of 600 dpi. It is then cropped to a size of, for example, 3400 × 4000 pixels, corresponding to a sample size of approximately 14 cm × 17 cm (see Figures 2A and 2G); here, an enlarged section of 100 × 100 pixels corresponding to a sample size of, for example, 0.4 × 0.4 cm is also shown (see Figures 2B and 2H). After the image is converted to a grayscale image (8-bit representation), it is converted to a binary image (see Figures 2C and 2D, and Figures 2I and 2J). This enables particle detection, i.e., image-analytical identification of particles and their pixel count, using the freeware software ImageJ (see Figures 2E, 2F, 2K, and 2L). In line coating, production-related variability exists, such as air inclusion, poor wetting, and variations in pigment-binder ratios, which can result in missing line defects with significantly different appearances in shape and size; therefore, no limitations or sorting are performed in particle detection. By using the software settings (size: 0-infinity and circularity: 0.00-1.00), particles of any shape and size can be detected. This determines the coverage, including production-related variability.

[0255] Comparative Examples 1a and 1b In the context of Comparative Example 1a, the second coating color is 1 g / m². 2 The starch is directly applied to the paper substrate, and after drying, the basis weight is 4-6 g / m². 2 A second coating color layer was formed. The second coating color contains 75.7% by weight of platelet kaolin (Capim NP) as an inorganic pigment, 22.7% by weight of styrene acrylate (Aronal S 305) as a polymer binder, and 0.2% by weight of sodium hydroxide, 0.17% by weight of a synthetic thickener (Acroflex VX 559), 1.14% by weight of ammonium zirconium carbonate (Allicross AZC), and 0.1% by weight of an antifoaming agent (BYK LP 6009).

[0256] In the context of Comparative Example 1b, the first coating color is applied directly onto an uncoated paper substrate, and after drying, the basis weight is 4 g / m². 2 A first coating color layer is formed, and the second coating color is applied directly onto the dried first coating color layer, with a basis weight of 4-6 g / m² after drying. 2 A second coating color layer was formed. The composition of the second coating color in Comparative Example 1b corresponds to the composition of the second coating color in Comparative Example 1a.

[0257] However, in Comparative Example 1b, a different first coating color was used than in Comparative Example 1a, which contained 49.09% by weight of pulverized calcium carbonate (Hydrocarb 60) as an inorganic pigment, 49.11% by weight of styrene acrylate (Aronal S305) as a polymer binder, as well as 0.09% by weight of sodium hydroxide, 0.29% by weight of a synthetic thickener (Acroflex VX559), and 1.48% by weight of ammonium zirconium carbonate.

[0258] Therefore, Comparative Example 1b differs from Comparative Example 1a due to the presence of the first coating color layer.

[0259] As shown in Table 1 below, the composite structures according to Comparative Example 1a and Comparative Example 1b were examined for oxygen permeability, roughness, water vapor transmission rate, and Cobb oil value by referring to the description of the above method.

Table 1

[0260] Comparative Example 2 and Embodiment 2 In the context of Comparative Example 2, the composite structure of Comparative Example 1a was used, and in the context of Embodiment 2, the composite structure of Comparative Example 1b was used, where a third coating color was applied to each composite structure and, after drying, a basis weight of 8 g / m 2 was used to form a third coating color layer, where the third coating color exclusively contains polyvinyl alcohol (Baumeister HS25).

[0261] Therefore, Embodiment 2 differs from Comparative Example 2 only in the presence of the first coating color layer.

[0262] As shown in Table 2 below, the composite structures according to Comparative Example 2 and Embodiment 2 were examined for oxygen permeability, deviation of oxygen permeability, hexane vapor transmission rate (HVTR), grease resistance (PKOFT), KIT value, and sealing property by referring to the description of the above method.

Table 2

[0263] However, a difference occurs in the deviation of the oxygen permeability of each composite structure, whereby the low value of 12% according to Embodiment 2 is advantageous compared to the high value of 31% according to Comparative Example 2.

[0264] Therefore, the oxygen barrier effect of the composite structure according to Embodiment 2 (having the first coating color layer) is greater than that of the composite structure according to Comparative Example 2 (without the first coating color layer).

[0265] Comparative Example 3 and Embodiment 3 In the context of Comparative Example 3, the composite structure of Comparative Example 1a was used, and in the context of Embodiment 3, the composite structure of Comparative Example 1b was used. The third coating color was applied to each composite structure, and after drying, the basis weight was 8 g / m². 2 A third coating color layer is formed, and here the third coating color consists exclusively of MB46E.

[0266] Therefore, Embodiment 3 differs from Comparative Example 3 only in the presence of the first coating color layer.

[0267] As shown in Table 3 below, the composite structures according to Comparative Example 3 and Embodiment 3 were examined with respect to hexane vapor permeability (HVTR), deviation of hexane vapor permeability (HVTR), MW-HVTR, KIT value, and sealing performance, referring to the description of the method above. [Table 3] As can be seen from Table 3, the hexane vapor permeability (HVTR), KIT value, and sealing performance of the composite structure according to Comparative Example 3 and the composite structure according to Embodiment 3 are similarly average, or even very good, respectively.

[0268] However, there are differences in the variability of hexane vapor permeability in each composite structure, and the lower value of 11% in Embodiment 3 is advantageous compared to the higher value of 37% in Comparative Example 3. Embodiment 3: 13 g / m 2 The corresponding low HVTR-MW value of / day is 25 g / m², according to Comparative Example 3. 2 This is also advantageous when compared to the HVTR-MW value per day.

[0269] Therefore, the fragrance barrier effect or mineral oil barrier effect of the composite structure according to Embodiment 3 (having the first coating color layer) is greater than that of the composite structure according to Comparative Example 3 (without the first coating color layer).

[0270] Comparative Example 4 and Embodiment 4 In the context of Embodiment 4, the first coating color is applied directly onto an uncoated paper substrate, and after drying, it has a basis weight of 4 g / m². 2 A first coating color layer is formed, and a second coating color layer is applied directly onto the dried first coating color layer, with a basis weight of 4 g / m² after drying. 2 A second coating color layer was formed. The compositions of the first and second coating color layers in Embodiment 4 are the same, containing clay as an inorganic pigment and further containing a polymer binder.

[0271] The third coating color is applied immediately onto the dried second coating color layer, and after drying, it has a basis weight of 9 g / m². 2 A third coating color layer was formed. The third coating color contains an aqueous mixture consisting of 11.2% by weight of pullulan and 4.8% by weight of xylitol (xylitol containing 30% solids), based on the dry mass of the third coating color layer.

[0272] Comparative Example 4 differs from Embodiment 4 only in that the composite structure of Comparative Example 4 does not have a first coating color layer.

[0273] As shown in Table 4 below, the composite structures according to Comparative Example 4 and Embodiment 4 were examined with respect to the fold resistance of the inner and outer folds, grease resistance (PKOFT), seal strength, and oxygen permeability (OTR) with reference to the method described above. [Table 4] Comparative Example 5 and Embodiment 5 Embodiment 5 is identical to Embodiment 4, and Comparative Example 5 is identical to Comparative Example 4, except that the third coating color contains sorbitol as a rheological aid instead of xylitol.

[0274] Comparative Example 5 differs from Embodiment 5 only in that the composite structure of Comparative Example 5 does not have a first coating color layer.

[0275] As shown in Table 5 below, the composite structures according to Comparative Example 5 and Embodiment 5 were examined with respect to the fold resistance of the inner and outer folds, grease resistance (PKOFT), seal strength, and oxygen permeability (OTR) with reference to the method described above. [Table 5] In conclusion, it can be stated that by using two coating color layers between the carrier substrate and the third coating color layer, the barrier effect of multiple parameters of the environmentally friendly packaging material against oxygen, water, grease, and / or aromatic substances can be improved for multiple different materials of the third coating color layer.

[0276] Furthermore, by using two coating color layers between the carrier substrate and the third coating color layer, it is possible to advantageously reduce the application weight of each of the first, second, and / or third coating color layers without impairing the barrier effect of the environmentally friendly packaging material, thereby reducing the manufacturing cost of the environmentally friendly packaging material.

[0277] Furthermore, a suitable environmentally friendly packaging material having three different coating color layers that can be advantageously folded and sealed allows for the formation of multiple different packaging options.

[0278] Evaluation of the surface quality of at least one coating color layer Figures 2A to 2L show a visual representation of the surface of the first coating color layer applied to a carrier substrate and dried, where the surface is pretreated using the burnout test described above and then subjected to image analysis using the ImageJ software described above.

[0279] The first coating color used herein comprises 75.7% by weight of platelet kaolin (Capim NP) as an inorganic pigment, 22.7% by weight of styrene acrylate (Aronal S 305) as a polymer binder, and 0.2% by weight of sodium hydroxide, 0.17% by weight of a synthetic thickener (Acroflex VX 559), 1.14% by weight of ammonium zirconium carbonate (Allicross AZC), and 0.1% by weight of an antifoaming agent (BYK LP 6009).

[0280] In further experiments, a first coating paint (S1*) with the following composition was used: 75.9% pigment (layered silicate), 22.8% latex (styrene-butadiene latex), and 1.3% rheological modifier (0.2% acrylate-based thickener, 1.1% zirconium-based crosslinking agent).

[0281] Figures 2A to 2F show the surface of a single layer of the first coating color. Figures 2G to 2L show paper after two applications of the first coating color, where Figures 2G to 2L show the surface of the outermost layer of the two layers of the first coating color.

[0282] Before at least one second coating color layer, particularly one having the same composition as the first coating color layer or the first coating color layer S1*, is applied to at least one first coating color layer or the first coating color layer S1*, sample pretreatment is performed by a burnout test, and subsequently, image analysis is performed using the software ImageJ to enable evaluation of the surface quality of at least one first coating color layer.

[0283] The sections shown in Figures 2A, 2C, 2E, 2G, 2I, and 2K represent the entire sample, approximately 14 cm × 17 cm in size, or each section containing 3400 × 4000 pixels.

[0284] The sections shown in Figures 2B, 2D, 2F, 2H, 2J, and 2L are enlarged views of each section of the overall sample, which measures approximately 0.4 cm × 0.4 cm in size, or represent 100 × 100 pixels in each section.

[0285] The sections shown in Figures 2A, 2B, 2G, and 2H represent grayscale images in 8-bit representation after the burnout test has been performed.

[0286] The sections shown in Figures 2C, 2D, 2I, and 2J each represent the binary image converted from their respective 8-bit representations.

[0287] The sections shown in Figures 2E, 2F, 2K, and 2L each display the detection results of dark areas without pigment coating, based on their respective binary images and using ImageJ software.

[0288] The ImageJ software allows output of the area fraction of particles within a sample section.

[0289] As can be seen from Figure 2F, the area ratio of particles in the sample section is approximately 36% of that of the uncoated base paper when a corresponding single first coating color layer is applied.

[0290] According to Figure 2L, the area ratio of particles in the sample section is approximately 4% of the base paper when the corresponding first coating color layer is applied twice, and therefore is significantly better than when the first coating color layer is applied only once to the base paper.

[0291] Therefore, the base paper coverage can be increased from approximately 64% with a single application of the first coating color layer to approximately 96% with two applications of the first coating color layer, resulting in a more favorable quality for the packaging material.

Claims

1. A carrier substrate having a first side and a second side facing away from the first side; At least one first coating color layer disposed on the first and / or second side of the carrier substrate, wherein the at least one first coating color layer comprises at least one inorganic pigment and at least one polymer binder, or the at least one first coating color layer comprises at least one polymer binder and does not contain an inorganic pigment; At least one second coating color layer is applied directly to the at least one first coating color layer, wherein the at least one second coating color layer comprises at least one inorganic pigment and at least one polymer binder, or the at least one second coating color layer comprises at least one polymer binder and does not contain an inorganic pigment; At least one third coating color layer is applied directly or indirectly to the at least one second coating color layer, wherein the at least one third coating color layer is a barrier layer and / or a sealable layer. Environmentally friendly packaging material equipped with these features.

2. The aforementioned environmentally friendly packaging material meets the following conditions: a) The roughness of the environmentally friendly packaging material is 1 μm to 10 μm, preferably 1 μm to 8 μm, more preferably 2 μm to 6 μm, and most preferably 3 μm to 5 μm; b) Oxygen permeability at a temperature of 23°C ± 2°C and relative humidity of 0% according to standard DIN ISO 15105-2 is 10 cm ３ / m ２ Smaller than / day, preferably 8 cm ３ / m ２ Smaller than / day, and more preferably 5cm ３ / m ２ Less than / day, and most preferably 1 cm ３ / m ２ / Less than a day; c) The water vapor transmission rate according to specification ISO 535 is less than 30 g / m ２ and preferably less than 25 g / m ２ ; d) The fold resistance of the outer fold of the environmentally friendly packaging material after bending with a load of 330 g / cm, and / or the fold resistance of the inner fold of the environmentally friendly packaging material after bending with a load of 330 g / cm; e) Grease resistance according to standard DIN 53116; f) Aroma tolerance measured by hexane vapor permeation test (HVTR) is 10 g / m². ２ / Less than a day; g) The KIT value determined by standard Tappi T 559 is greater than 6, preferably greater than 8, more preferably greater than 10, and most preferably 12 or greater; h) Sealing performance according to standard DIN 55529 (2012) The environmentally friendly packaging material according to claim 1, which satisfies at least one, preferably at least two, more preferably at least three, even more preferably at least four, even more preferably at least five, even more preferably at least six, even more preferably at least seven, and even more preferably at least eight of the above.

3. The at least one polymer binder of the at least one first coating color layer and / or the at least one second coating color layer is selected from the group including natural binders, modified natural binders, synthetic binders, other binders and mixtures thereof, preferably, a) The natural binder is selected from the group comprising natural polymers, more preferably natural cellulosic polymers, even more preferably cellulose, natural lignin polymers and / or natural starch polymers, more preferably starch, protein, more preferably casein, polysaccharides, more preferably pullulan, chitosan and / or alginic acid, and mixtures thereof; b) The modified natural binder is selected from the group comprising modified starch, carboxymethylcellulose, hydroxyethylcellulose, and mixtures thereof; c) The synthetic binder is selected from the group comprising butadiene styrene, styrene acrylate, butadiene acrylonitrile, butadiene methyl methacrylate, and mixtures thereof, and is more preferably styrene acrylate; d) The other binder is selected from the group comprising acrylic acid esters, polyvinyl alcohol, polyvinyl acetate and mixtures thereof, and is more preferably polyvinyl alcohol. The environmentally friendly packaging material according to claim 1 or 2.

4. The at least one first coating color layer contains 1% to 70% by weight, preferably 5% to 50% by weight, of the at least one polymer binder, based on the dry mass of each of the at least one first coating color layers, and / or The environmentally friendly packaging material according to claim 1 or 2, wherein the at least one second coating color layer contains 1% to 70% by weight, preferably 5% to 50% by weight, of the at least one polymer binder based on the dry mass of each of the at least one second coating color layers.

5. The environmentally friendly packaging material according to claim 1 or 2, wherein the at least one inorganic pigment of the at least one first coating color layer and / or the at least one second coating color layer is selected from the group comprising calcined kaolin, kaolin, kaolinite, hydrated magnesium silicate, silicon dioxide, bentonite, calcium carbonate, aluminum hydroxide, aluminum oxide, bauxite, aluminum sulfate, titanium dioxide, barium sulfate, talc, and mixtures thereof, preferably calcined kaolin, kaolin, kaolinite, talc, and / or calcium carbonate, particularly pulverized calcium carbonate (GCC) and / or precipitated calcium carbonate (PCC), and most preferably pulverized calcium carbonate (GCC) and / or precipitated calcium carbonate (PCC) and / or kaolin.

6. The at least one first coating color layer contains 50% to 95% by weight, preferably 80% to 90% by weight, of the at least one inorganic pigment, and / or based on the dry mass of each of the at least one first coating color layers. The at least one second coating color layer contains 50% to 95% by weight, preferably 80% to 90% by weight, of the at least one inorganic pigment, based on the dry mass of each of the at least one second coating color layers. The environmentally friendly packaging material according to claim 1 or 2.

7. The ratio of the polymer binder to the inorganic pigment in the at least one first coating color layer is 1:5 to 5:1, preferably 1:4 to 4:1, more preferably 1:3 to 3:1, even more preferably 1:2 to 2:1, and most preferably about 1:1, and / or The ratio of the polymer binder to the inorganic pigment in the at least one second coating color layer is 1:4 to 4:1, preferably 1:4 to 1:2, and most preferably 1:4 to 1:

3. The environmentally friendly packaging material according to claim 1 or 2.

8. The third coating color layer comprises at least one polysaccharide, at least one rheological aid, at least one Sealcoat MB46HE, and a mixture thereof, preferably a) The at least one polysaccharide is selected from the group comprising hemicellulose, cellulose, starch, alginic acid, chitosan, pullulan, dextran, agarose, and mixtures thereof, more preferably pullulan, chitosan, and / or alginic acid, and most preferably exclusively pullulan; b) The at least one rheological adjuvant is: b-1) Sugar alcohols selected from the group comprising diglycerol, triglycerol, fructose, ribose, xylose, D-mannitol, triacetin, and mixtures thereof: b-2) A polyol selected from the group comprising pentaerythritol, dipentaerythritol, polyvinyl alcohol, xylitol, sorbitol and mixtures thereof, more preferably xylitol and / or sorbitol, and most preferably xylitol; b-3) Diols selected from the group comprising methylpentanediol, 1,2-propanediol, 1,4-butanediol, 2-hydroxy-1,3-propanediol, 3-methyl-1,3-butanediol, 3,3-dimethyl-1,2-butanediol, and mixtures thereof; b-4) Glycols selected from the group comprising polyethylene glycol 300, polyethylene glycol 400, alkoxylated polyethylene glycol, and mixtures thereof; b-5) Caprolactam, cyclotrimethylolpropane, resin esters, erucamide and mixtures thereof Selected from the group including, Here, a mixture of subgroups b-1) to b-5) is included. The environmentally friendly packaging material according to claim 1 or 2.

9. The environmentally friendly packaging material according to claim 8, wherein the third coating color layer contains 10% to 95% by weight, preferably 2% to 35% by weight, more preferably 5% to 25% by weight, and most preferably 10% to 20% by weight of at least one rheological aid, particularly a polyol, based on the total dry mass of the third coating color layer.

10. The environmentally friendly packaging material according to claim 8, wherein the third coating color layer contains 10% to 95% by weight, preferably 10% to 40% by weight, more preferably 10% to 25% by weight, more preferably 10% to 19.9% ​​by weight, even more preferably 12% to 18% by weight, and most preferably 15% to 18% by weight of the at least one polysaccharide, based on the total dry mass of the third coating color layer.

11. The environmentally friendly packaging material according to claim 8, wherein the third coating color layer contains polyvinyl alcohol as a rheological aid, and preferably the third coating color layer contains exclusively polyvinyl alcohol.

12. The environmentally friendly packaging material according to claim 1 or 2, wherein the at least one third coating color layer preferably contains an inorganic pigment selected from the group including natural calcium carbonate (GCC, pulverized calcium carbonate), precipitated calcium carbonate (PCC), aluminum oxide, aluminum hydroxide, silica, particularly precipitated and calcined silica, diatomaceous earth, magnesium carbonate, titanium oxide, bentonite, and clay, and is preferably clay, talc, or kaolin.

13. The following are the process steps: A step of providing a carrier substrate having a first side and a second side facing away from the first side; The step of arranging at least one first coating color layer on the first and / or second side of the carrier substrate, wherein the at least one first coating color layer comprises at least one inorganic pigment and at least one polymer binder, or the at least one first coating color layer comprises at least one polymer binder and does not contain an inorganic pigment; A step of drying the at least one first coating color layer in order to obtain at least one dried first coating color layer disposed on the first and / or second side of the carrier substrate; A step of directly applying at least one second coating color layer to the at least one dried first coating color layer, wherein the at least one second coating color layer comprises at least one inorganic pigment and at least one polymer binder, or the at least one second coating color layer comprises at least one polymer binder and does not contain an inorganic pigment; A step of drying the at least one second coating color layer in order to obtain at least one dried second coating color layer disposed on the at least one dried first coating color layer; The steps include: applying at least one third coating color indirectly or directly to the at least one dried second coating color layer; and To obtain at least one third coating color layer disposed on the at least one dried second coating color layer, the at least one third coating color is dried, wherein the third coating color layer is a barrier layer and / or a sealable layer. A method for manufacturing environmentally friendly packaging materials.

14. Use of the environmentally friendly packaging material according to claim 1 or 2, particularly for consumer goods, food products, electronic products and / or tobacco products, as packaging.

15. A third coating color for indirectly or directly coating a second coating color layer applied to a first coating color layer, wherein the first coating color layer is applied to a carrier substrate, and the third coating color is: Based on the total dry mass of the third coating color, at least one polysaccharide is added in an amount of 10% to 95% by weight; Based on the total dry mass of the third coating color, at least one rheological auxiliaries, particularly polyols, in an amount of 10% to 90% by weight; and At least one liquid, especially water; Includes, The third coating color has a viscosity between 150 mPas and 1300 mPas, and the viscosity of the third coating color is determined by the weight ratio of the at least one polysaccharide to the at least one rheological aid, particularly a polyol. Third coating color.

Images