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WO2024256573A1 - Matériau d'emballage respectueux de l'environnement - Google Patents

Matériau d'emballage respectueux de l'environnement Download PDF

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Publication number
WO2024256573A1
WO2024256573A1 PCT/EP2024/066431 EP2024066431W WO2024256573A1 WO 2024256573 A1 WO2024256573 A1 WO 2024256573A1 EP 2024066431 W EP2024066431 W EP 2024066431W WO 2024256573 A1 WO2024256573 A1 WO 2024256573A1
Authority
WO
WIPO (PCT)
Prior art keywords
coating
coating layer
packaging material
layer
environmentally friendly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/EP2024/066431
Other languages
German (de)
English (en)
Inventor
Dominik HOFERER
Georg Streif
Gerrit ROOSEN
Andreas GRANIECZNY
Markus WILDBERGER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koehler Innovation and Technology GmbH
Original Assignee
Koehler Innovation and Technology GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koehler Innovation and Technology GmbH filed Critical Koehler Innovation and Technology GmbH
Publication of WO2024256573A1 publication Critical patent/WO2024256573A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/42—Applications of coated or impregnated materials
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/54—Starch
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/60—Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/84—Paper comprising more than one coating on both sides of the substrate
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/16—Sizing or water-repelling agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/10—Packing paper

Definitions

  • the present invention relates to an environmentally friendly packaging material comprising a carrier substrate which has a first side and a second side facing away from the first side, at least one first coating layer which is arranged on the first and/or second side of the carrier substrate, at least one second coating layer which is applied directly to the at least one first coating layer, and at least one third coating layer which is applied directly or indirectly to the at least one second coating layer, wherein the third coating layer is a barrier layer and/or a sealable layer.
  • the present invention relates to a method for producing an environmentally friendly packaging material.
  • the present invention relates to an environmentally friendly packaging material producible by a method according to the second aspect.
  • the present invention relates to a use of an environmentally friendly packaging material according to the first and/or third aspect as packaging, in particular for consumer goods, food, electronic articles and/or tobacco products.
  • the present invention relates to a third coating color for the indirect or direct coating of a second coating color layer which is applied to a first coating color layer, wherein the first coating color layer is applied to a carrier substrate.
  • a packaging material or packaging paper generally refers to a paper cover, in particular a partial or complete cover, of an object, in particular for its protection or for better handling. Consequently, a packaging material or packaging paper includes the paper material that forms such a packaging.
  • Conventional packaging material is used primarily as packaging for consumer goods, food, electronic items and/or tobacco products.
  • a packaging material for packaging consumer goods, food, electronic items and/or tobacco products protects the packaged goods from external influences such as moisture or dirt, on the one hand, and prevents components of the packaged goods from escaping to the outside, on the other.
  • packaging materials for packaging consumer goods, food, electronic items and/or tobacco products must meet various criteria. Suitable packaging materials should, among other things, meet mechanical and process-specific requirements and have effective barrier properties against, for example, water, fat, mineral oils, flavorings and/or oxygen.
  • a packaging material for packaging consumer goods, food, electronics and/or tobacco products should also have sufficient tear resistance, a friction coefficient adapted to further processing, e.g. in a printing and packaging machine, and sufficient flexibility to be able to package the goods to be packaged effectively.
  • a packaging material can be a simple wrapping paper or, if it is partially or fully coated with a heat and cold sealable coating, can be used to make bags, be printable from the outside and not lose its protective effect during the entire conversion and packaging process.
  • fluorine-free chemicals are used in order to fluorine contamination of the packaged goods and/or to avoid the release of fluorine-containing chemicals into the environment.
  • WO 2022/003472 A1 discloses a barrier coating for paper and cardboard which comprises a polysaccharide and a polycationic polymer.
  • WO 2022/269198 A1 discloses a multilayer packaging material which has barrier properties, is biodegradable and recyclable.
  • JP 2003-013391 A discloses packaging material having a biodegradable resin coating.
  • WO 2008/068779 A2 discloses a packaging material with a water-soluble film.
  • packaging materials if they optionally consist of plastic, especially fossil raw materials, are often not or only partially recyclable, and are also often not or only partially biodegradable.
  • the packaging must provide a high level of safety with regard to the goods to be packaged.
  • a decisive criterion in assessing the safety of packaging material is that components, in particular water-soluble components of corresponding conventional packaging materials do not migrate, or only to an extremely small extent, from the packaging materials into the respective packaged consumer goods and/or foodstuffs, or into the respective packaged tobacco products, and contaminate them, so that when a user uses consumer goods, foodstuffs, electronic items and/or tobacco products packaged in packaging materials, possible health risks to the user can be excluded or minimized.
  • packaging materials even if they are made from natural raw materials, often have only a limited barrier effect against oxygen, water vapor, mineral oils, flavorings and/or fat, so that in many cases they are not suitable or only suitable to a limited extent as packaging for consumer goods, food, electronic items and/or tobacco products.
  • coating color used in the context of the present invention refers, in accordance with the general understanding in the field of paper technology, to coating materials containing or consisting of binders, additives and/or pigments which are applied or “coated” onto a substrate surface, in particular a paper surface, using special coating devices for surface finishing or modification of a carrier substrate or carrier paper. Papers produced in this way are referred to as “coated papers”.
  • a “coated paper” is understood to mean a carrier substrate which comprises one or more layers applied by coating, i.e. coating color layers. Possible layers of such a coated carrier substrate are functional layers and structure-forming layers, such as leveling layers for smoothing the surface.
  • coating color is used as a generic term for all spreadable coating materials, preparations and/or solutions in the paper industry for treating, modifying or refining a paper surface.
  • coating color layer refers to the coating color applied to the carrier substrate and dried and filmed.
  • a “paper” according to the present invention is a sheet material that consists essentially of fibers of plant origin and is formed by dewatering a fiber suspension on a sieve. The resulting fiber fleece is compacted and dried. Within the scope of the present invention, the papers produced in the same way The flat materials "cardboard” and “paperboard” are also subsumed under paper. A distinction is made between paper, cardboard and paperboard only on the basis of the basis weight, with cardboard having a basis weight of more than 600 g/m 2 , cardboard having a basis weight of more than 150 g/m 2 and less than or equal to 600 g/m 2 and paper having a basis weight of less than or equal to 150 g/m 2 .
  • the molar mass of a polymer is usually not constant, but is described by a molar mass distribution.
  • Various average values for the molar mass distribution can be defined in order to statistically describe the molar mass of a polymer, including the viscosity average, the mass average, and the number average of the molar mass.
  • the molar mass Mj of the polymer with a number i of monomers is weighted by the relative number proportion that this polymer has.
  • the number average M n of the molar mass describes the average of the molar masses of all polymers in a sample according to the formula shown below. Ni corresponds to the number of monomers in the sample with exactly i repeating units:
  • the object of the present invention is to provide a packaging material which is environmentally friendly, i.e. to provide a packaging material which is biodegradable and/or which is advantageously recyclable.
  • the present invention aims at a corresponding environmentally friendly packaging material having a reduced migration of components of the packaging material into goods packaged by the packaging material, such as consumer goods, food, electronic articles and/or tobacco products.
  • the packaging material of the present invention is intended to prevent or at least slow down the migration of components, in particular fats and oils, of the packaged goods, such as consumer goods, foodstuffs, electronic articles and/or tobacco products, to the outside.
  • the present invention aims at ensuring that a corresponding environmentally friendly packaging material has a high kink resistance and/or sealability in order to ensure a high degree of freedom in the design of the packaging made from the packaging material.
  • the present invention further aims to enable a corresponding environmentally friendly packaging material to be produced economically on a large industrial scale, so that this environmentally friendly packaging material can be produced, for example, by industrial coating machines with production speeds of more than 1000 meters per minute.
  • the present invention further aims to ensure that corresponding coating colors, which are used to produce the corresponding coating color layers of the environmentally friendly packaging material, have sufficiently high solids concentrations so that these coating colors can be dried with low drying energy during the production of the corresponding coating color layers and multiple layer applications are not necessary in order to apply a sufficiently thick coating color layer.
  • an environmentally friendly packaging material comprising a carrier substrate, which has a first side and a second side facing away from the first side; at least one first coating layer which is arranged on the first side and/or second side of the carrier substrate, wherein the at least one first coating layer comprises at least one inorganic pigment and at least one polymeric binder, or wherein the at least one first coating layer comprises at least one polymeric binder and no inorganic pigment; at least one second coating layer which is applied directly to the at least one first coating layer, wherein the at least one second coating layer comprises at least one inorganic pigment and at least one polymeric binder, or wherein the at least one second coating layer comprises at least one polymeric binder and no inorganic pigment; at least one third coating layer which is applied directly or indirectly to the at least one second coating layer, wherein the at least one third coating layer is a barrier layer and/or a sealable layer.
  • the at least one third coating layer of the environmentally friendly packaging material which is designed as a barrier layer, prevents the migration of oxygen, water vapor, fat, mineral oils and/or flavorings through the packaging material, so that the packaging material is suitable for packaging a large number of different goods, and so that substances from outside cannot penetrate through the at least one third coating layer to the packaged goods.
  • the at least one third coating layer of the environmentally friendly packaging material which is designed as a sealable layer, ensures that the environmentally friendly packaging material can be used to produce bags.
  • the polymeric binder or inorganic pigment used for the first coating layer and for the second coating layer consists of natural raw materials, so that the packaging material according to the present invention is advantageously environmentally friendly.
  • the environmentally friendly packaging material according to the present invention is particularly advantageously bio- biodegradable and/or recyclable, so that the environmentally friendly packaging material according to the present invention contributes significantly to reducing global plastic waste pollution.
  • the combination of the at least one first coating color layer, the at least one second coating color layer and the at least one third coating color layer, which are applied to the carrier substrate in the order mentioned ensures an effective barrier effect of the environmentally friendly packaging material in that migration of components of the packaging material into goods packaged by the packaging material, such as consumer goods, food, electronic items and/or tobacco products, is effectively reduced, so that the risk of a health hazard to users of the packaging material due to correspondingly contaminated goods can be advantageously reduced.
  • the packaging material according to the present invention prevents migration of oxygen, water vapor, fat, mineral oils and/or flavorings through the packaging material, so that the packaging material is suitable for packaging a variety of different goods.
  • the use of a total of at least three coating layers on the carrier substrate according to the present invention significantly increases the barrier effect compared to known packaging materials with two coating layers or with only one coating layer on the carrier substrate.
  • the environmentally friendly packaging material according to the present invention serves as at least an equivalent replacement for conventional plastic-based packaging materials, such as unprinted, printed or coated plastic.
  • At least one first, or at least one second, or at least one third coating layer requires an effective application of the respective minimum at least one first, or at least one second, or at least one third coating color onto the carrier substrate.
  • the at least one first and/or the at least one second and/or the at least one third coating color layer is a first and/or second and/or third coating color layer applied by means of an aqueous dispersion or an aqueous solution.
  • the at least one first coating layer applied directly to the carrier substrate in particular ensures that the second coating layer subsequently applied directly to the first coating layer ensures an advantageously homogeneous coating, or the second coating layer directly applied directly to the first coating layer ensures that the third coating layer subsequently applied directly or indirectly ensures an advantageously homogeneous coating.
  • the application weight of the at least one third coating layer can be advantageously reduced without adverse properties of the packaging material being observed.
  • the at least one first coating color layer comprises at least one front-side first coating color layer which is arranged on the first side of the carrier substrate, or the at least one first coating color layer comprises at least one rear-side first coating color layer which is arranged on the second side of the carrier substrate, or the at least one first coating color layer comprises at least one front-side first coating color layer which is arranged on the first side of the carrier substrate and at least one rear-side first coating color layer which is arranged on the second side of the carrier substrate.
  • the at least one second coating layer comprises at least one front-side second coating layer which is applied directly to the at least one front-side first coating layer, or comprises the at least at least one second coating layer comprises at least one rear second coating layer which is applied directly to the at least one rear first coating layer, or the at least one second coating layer comprises at least one front second coating layer which is applied directly to the at least one front first coating layer, and at least one rear second coating layer which is applied directly to the at least one rear first coating layer.
  • the at least one third coating layer comprises at least one front-side third coating layer which is applied directly or indirectly to the at least one front-side second coating layer, or the at least one third coating layer comprises at least one rear-side third coating layer which is applied directly or indirectly to the at least one rear-side second coating layer, or the at least one third coating layer comprises at least one front-side third coating layer which is applied directly or indirectly to the at least one front-side second coating layer, and at least one rear-side third coating layer which is applied directly or indirectly to the at least one rear-side second coating layer.
  • first, second and third coating layers can be present in the environmentally friendly packaging material.
  • 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, even more preferably at least eight of the following defined conditions: a) a roughness of the environmentally friendly packaging material of 1 to 10 .m, preferably 1 to 8 .m, more preferably 2 to 6 .m and most preferably 3 to 5 .m; b) an oxygen permeability at a temperature of 23°C ⁇ 2°C and an air humidity of 0% according to the standard DIN ISO 15105-2 of less than 10 cm 3 per m 2 per day, preferably less than 8 cm 3 per m 2 per day, and more preferably less than 5 cm 3 per m 2 per day, and most preferably less than 1 cm 3 per m 2 per day; c) a water vapor permeability (Water Vapor Transmission Rate) according to the standard ISO 15106-2 of less than 30 a roughness of
  • the environmentally friendly packaging material has a roughness of 1 to 10 .m, preferably from 1 to 8 .m, more preferably from 2 to 6 .m and most preferably from 3 to 5 .m.
  • the pre-coat provides the layer adhesion between the base paper and the barrier layer, which can be important for later sealing applications.
  • the environmentally friendly packaging material has an oxygen permeability at a temperature of 23°C ⁇ 2°C and a humidity of 0% according to the standard DIN ISO 15105-2 of less than 10 cm 3 per m 2 per day, preferably less than 8 cm 3 per m 2 per day, and more preferably less than 5 cm 3 per m 2 per day, and most preferably less than 1 cm 3 per m 2 per day.
  • the environmentally friendly packaging material has a water vapor transmission rate of less than 30 g/m 2 , preferably less than 25 g/m 2 .
  • the water vapor transmission rate is determined according to the ISO 15106-2 standard.
  • the environmentally friendly packaging material has a bending resistance of an external bend of the environmentally friendly packaging material after folding with a load of 330 g/cm
  • the environmentally friendly packaging material has a bending resistance of an internal bend of the environmentally friendly packaging material after folding with a load of 330 g/cm.
  • the environmentally friendly packaging material is grease-proof in accordance with the DIN 53116 standard.
  • the grease-tightness test carried out in accordance with DIN 53116 is also known as the palm kernel oil fat test (PK ⁇ FT).
  • the environmentally friendly packaging material has an aroma resistance according to a hexane vapor transmission test (HVTR) of less than 10 g per m 2 per day.
  • HVTR hexane vapor transmission test
  • the hexane vapor transmission test (HVTR) is carried out gravimetrically, using cups in accordance with the DIN 53122-1 standard, which are filled with n-hexane and the sample is clamped in the cup with the coated side facing the n-hexane.
  • the hexane loss is determined by weighing the cup several times over a period of 24 hours over a defined area.
  • the environmentally friendly packaging material has a KIT value according to the Tappi T 559 standard of more than 6, preferably more than 8, more preferably more than 10, and most preferably 12 or more.
  • the KIT value determined according to the Tappi T 559 standard of more than 6, preferably more than 8, more preferably more than 10, and most preferably 12 or more characterizes particularly advantageous barrier properties of the environmentally friendly packaging material and thus ensures, especially in the case of packaged fatty foods, that no fatty components of the food penetrate through the packaging material.
  • packaging material particularly suitable for packaging food, especially fatty foods, and complies with existing legal standards regarding food packaging in Europe and/or in individual European countries.
  • the environmentally friendly packaging material has a sealability according to the standard DIN 55529 (2012).
  • the coated paper was sealed at 3.3 bar for 0.3 seconds in the temperature range from 100 °C to 200 °C across the paper grain and the seal seam strength was measured.
  • packaging material is not only suitable as wrapping paper or wrapper, but can also be used to produce closed packaging (e.g. bags).
  • the environmentally friendly packaging material is designed as a heat-sealable or a cold-sealable packaging material.
  • a heat-sealable packaging material is understood here in particular to mean the connection of two layers of the packaging material by means of local heat and/or pressure.
  • a cold-sealable packaging material here in particular comprises the application of a cold-seal adhesive by means of a printing process to the section of the packaging material to be sealed.
  • the environmentally friendly packaging material is designed as a packaging material that can be sealed by ultrasound.
  • the environmentally friendly packaging material is designed as a biodegradable environmentally friendly packaging material.
  • packaging material can be removed from the ever-growing amount of packaging waste, since the corresponding biodegradable packaging material can be biologically broken down by organisms over a longer period of time after disposal and is thus decomposed.
  • biodegradable refers to packaging materials that have a biodegradability of at least 40% measured according to OECD 301 F or of at least 20% measured according to OECD 302 C (M ITI-I I test) and thus have inherent or fundamental degradability. This corresponds to the limit value for OECD 302 C according to “Revised Introduction to the OECD Guidelines for testing of Chemicals, section 3, Part 1, dated 23 March 2006”. From a limit value of at least 60% measured according to OECD 301 F, packaging materials are also referred to as rapidly biodegradable.
  • the environmentally friendly packaging material is designed as a recyclable environmentally friendly packaging material, wherein the recyclable environmentally friendly packaging material in particular complies with the standard PTS-RH 021:2012- Category II and/or the standard Aticelca UNI 11743:2019 (certification body Aticelca) and/or the standard 501:2019 (Aticelca).
  • the removal of printing ink from the packaging material is also relevant.
  • the evaluation of recyclability can be carried out, for example, using the INGEDE method 11, whereby the packaging material according to the invention preferably achieves a value of over 50 using the INGEDE method 11, most preferably over 70.
  • This achieves the technical advantage that a suitably recyclable, environmentally friendly packaging material can be advantageously reused after use, thereby improving the sustainability of the packaging material.
  • the recyclable packaging material can be integrated into a packaging cycle.
  • the at least one first coating color layer comprises a single first coating color layer which is arranged on the first or second side of the carrier substrate.
  • the at least one first coating layer comprises a first coating layer which is arranged on the first side or second side of the carrier substrate, and the at least one first coating layer comprises at least one further first coating layer which is applied to the first coating layer, wherein the first coating layer and the at least one further first coating layer comprise at least one inorganic pigment and at least one polymeric binder, or wherein the first coating layer and the at least one further first coating layer comprise at least one polymeric binder and no inorganic pigment.
  • the at least one second coating color layer comprises a single second coating color layer which is applied directly to the at least one first coating color layer.
  • the at least one second coating layer comprises a second coating layer which is applied directly to the at least one first coating layer, and the at least one second coating layer comprises at least one further second coating layer which is applied to the second coating layer.
  • the at least one third coating color layer comprises a single third coating color layer which is applied directly or indirectly to the at least one second coating color layer.
  • the at least one third coating layer comprises a third coating layer which is applied directly or indirectly to the at least one second coating layer, and the at least one third coating layer comprises at least one further third coating layer which is applied to the third coating layer.
  • the carrier substrate comprises cellulose, wherein the carrier substrate in particular comprises cellulose fibers.
  • the pulp or cellulose fibers consist of natural and environmentally friendly materials, and, on the other hand, the pulp or cellulose fibers ensure sufficient structural stability of the environmentally friendly packaging material so that it can be used effectively as packaging.
  • pulp especially cellulose fibres, is the exclusive component of the carrier substrate of the environmentally friendly packaging material.
  • the at least one pulp in particular the cellulose fibers, comprises a weight proportion of at least 70 wt.%, preferably at least 75 wt.%, more preferably at least 80 wt.% and most preferably at least 85 wt.% based on the total weight of the components of the environmentally friendly packaging material.
  • the carrier substrate comprises a long fiber pulp and/or a short fiber pulp.
  • a long-fibre pulp is understood here to mean in particular a pulp made from softwoods or in particular a pulp comprising fibres with a fibre 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.
  • a short-fibre pulp is understood here to mean in particular a pulp from hardwoods or in particular pulp comprising fibers with a fiber length of 0.5 to 2.2 mm or 0.7 mm to 2.2 mm or particularly preferably 0.5 to 1.5 mm.
  • the long-fiber pulp has a weight proportion of 10 wt.% to 80 wt.%, preferably 20 wt.% to 50 wt.%, based on the fiber mixture of long-fiber pulp and short-fiber pulp.
  • the short fiber pulp has a weight proportion of 20 wt.% to 90 wt.%, preferably 50 wt.% to 80 wt.%, based on the fiber mixture of long fiber pulp and short fiber pulp.
  • cellulose fibers from a) wood e.g. from deciduous or coniferous trees, b) annual plants and grasses, e.g. silphium, hemp, straw, etc., c) processed paper waste or d) processed waste paper or mixtures thereof are used to produce the carrier substrate.
  • the properties of the carrier substrate can be adjusted in a known manner, in particular by the type of cellulose fibers, the processing of the cellulose fibers, e.g. digestion processes, extraction, and the grinding and mixing of the cellulose fibers.
  • the carrier substrate comprises fresh fibers, primary fibers, secondary fibers and/or recycled fibers.
  • the carrier substrate has a basis weight of 20 g/m 2 to 120 g/m 2 , preferably from 40 g/m 2 to 100 g/m 2 .
  • the carrier substrate is selected from the group comprising uncoated papers, single-sided coated papers, and double-sided coated papers.
  • the carrier substrate can be advantageously selected depending on the application of the desired environmentally friendly packaging material.
  • the at least one polymeric 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 comprising natural binders, modified natural binders, synthetic binders, other binders and mixtures thereof, wherein preferably a) the natural binders are selected from the group comprising natural polymers, more preferably natural cellulose-based polymers, even more preferably cellulose, natural lignin-based polymers, and/or natural starch-based polymers, more preferably starch, proteins, more preferably casein, polysaccharides, more preferably pullulan, chitosan, and/or alginate, and mixtures thereof; b) the modified natural binders are selected from the group comprising modified starch, carboxymethylcellulose, hydroxyethylcellulose and mixtures thereof; c) the synthetic binders are selected from the group comprising butadiene-styrene, styrene-acrylate, butadiene-acrylonitrile,
  • the at least one first coating layer comprises from 1 wt. % to 70 wt. % of the at least one polymeric binder based on the respective dry mass of the at least one first coating layer, preferably from 5 wt. % to 50 wt. %, and/or the at least one second coating layer comprises from 1 wt. % to 70 wt. % of the at least one polymeric binder based on the respective dry mass of the at least one second coating layer, preferably from 5 wt. % to 50 wt. %.
  • At least one advantageous first coating layer or at least one advantageous second coating layer can be obtained by means of the corresponding weight proportions of the polymeric binder.
  • the at least one inorganic pigment of the at least one first coating layer and/or the at least one second Coating color layer selected from the group comprising calcined kaolin, kaolin, kaolinite, magnesium silicate hydrate, silicon oxide, bentonite, calcium carbonate, aluminum hydroxide, aluminum oxide, boehmite, aluminum sulfate, titanium dioxide, barium sulfate, talc, and mixtures thereof, preferably calcined kaolin, kaolin, kaolinite, talc and/or calcium carbonate, in particular ground calcium carbonate (GCC) and/or precipitated calcium carbonate (PCC), and most preferably ground calcium carbonate (GCC) and/or precipitated calcium carbonate (PCC) and/or kaolin.
  • GCC ground calcium carbonate
  • PCC precipitated calcium carbonate
  • PCC precipitated calcium carbonate
  • the at least one first coating layer comprises from 50% by weight to 95% by weight of the at least one inorganic pigment based on the respective dry mass of the at least one first coating layer, preferably from 80% by weight to 90% by weight and/or the at least one second coating layer comprises from 50% by weight to 95% by weight of the at least one inorganic pigment based on the respective dry mass of the at least one second coating layer, preferably from 80% by weight to 90% by weight.
  • the ratio of the polymeric binder to the inorganic pigment in the at least one first coating color layer is from 1 to 5 to 5 to 1, preferably from 1 to 4 to 4 to 1, more preferably from 1 to 3 to 3 to 1, even more preferably from 1 to 2 to 2 to 1, and most preferably about 1 to 1, and/or the ratio of the polymeric binder to the inorganic pigment in the at least one second coating color layer is from 1 to 4 to 4 to 1, preferably from 1 to 4 to 1 to 2, and most preferably from 1 to 4 to 1 to 3.
  • the inorganic pigment of the at least one first coating color layer and/or second coating color layer is platelet-shaped.
  • 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 has an aspect ratio of 5 to 100, preferably of 15 to 100, more preferably of 20 to 80.
  • 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 has a particle size distribution of 0.5 .m to 3.0 .m.
  • the third coating layer comprises at least one polysaccharide, at least one rheology aid, at least one Sealcoat MB46HE, and mixtures thereof, wherein preferably a) the at least one polysaccharide is selected from the group comprising hemicellulose, cellulose, starch, alginate, chitosan, pullulan, dextran, agarose and mixtures thereof, more preferably pullulan, chitosan and/or alginate, and most preferably exclusively pullulan; b) the at least one rheology aid is selected from the group comprising: b-1) sugar alcohols selected from the group comprising: diglycerol, triglycerol, fructose, ribose, xylose, D-mannitol, triacetin, and mixtures thereof; b-2) polyols selected from the group comprising: pentaerythritol, dipentaerythritol, polyvinyl alcohol, xylit
  • the use of the at least one polysaccharide in the third coating layer ensures an advantageous compromise between an optimal viscosity of the third coating layer for producing the third coating layer and the drying properties of the correspondingly applied third coating layer, and that the rheology aids mentioned are environmentally friendly additives which also ensure an advantageous adjustment of the viscosity of the third coating layer so that it can be applied on an industrial scale.
  • the third coating layer is a sealing layer comprising at least one thermoplastic polymer.
  • a sealing layer is particularly useful when the at least one hydrophobic polymer in the third coating layer does not comprise a thermoplastic polymer, i.e. is not heat-sealable.
  • the sealing layer preferably comprises a thermoplastic polymer based on a polyacrylate, a styrene-2-butadiene copolymer and/or a polyolefin.
  • Suitable polymers also include, in particular, acrylates, polymethacrylates, polymethylacrylates, polymethylmethacrylates, polyethylarylates, polyethylmethacrylates, poly(n-, iso-, tert-)butylacrylates, poly(n-, iso-, tert-)butylmethacrylates, polycyclohexylmethacrylates, polyethylhexylacrylates and their copolymers, graft polymers, and copolymers with styrene, acrylonitrile, methylstyrene and/or vinyltoluene.
  • Suitable polymers are available in particular under the trade names Vapor Coat 1300, BimBA 8888, Cartaseal SWF, Rhobarr 320, B-Coat WB 100, B-Coat 50/3, Chemipearl S300, Ultraseal W-952, Wükoseal 630, EurikaCoat 3624, Epotal SP 106, Hypod 2000, Extomine BS-OF 40%, Aquaseal X2200, Cartaseal SCR, CHT Coat 8080, Sealcoat MB46HE and Extomine BG-EM 48%.
  • the at least one polysaccharide of the third coating layer has a number average degree of polymerization X n of at least 175, preferably of at least 200, more preferably of at least 250, even more preferably of at least 300, even more preferably of at least 400, even more preferably of at least 500, even more preferably of at least 600, even more preferably of at least 700 and most preferably of at least 800.
  • the at least one polysaccharide of the third coating layer has different number average degrees of polymerization X n .
  • the at least one polysaccharide of the at least one third coating color layer has a number average molar mass M n between 1 x 10 5 g/mol and 8 x 10 5 g/mol, preferably between 2 x 10 5 g/mol and 6 x 10 5 g/mol, and most preferably between 3 x 10 5 g/mol and 4 x 10 5 g/mol.
  • the third coating layer comprises from 10 wt.% to 95 wt.%, preferably from 2 wt.% to 35 wt.% of the at least one rheology aid, in particular the polyol, based on the total dry mass of the third coating layer, more preferably from 5 wt.% to 25 wt.%, and most preferably from 10 wt.% to 20 wt.%.
  • an advantageous viscosity can be set by means of the stated weight proportions of the at least one rheology aid, in particular the polyol, in the third coating color for producing the third coating color layer.
  • the rheology aid, in particular the polyol serves as a plasticizer.
  • the third coating layer comprises from 10 wt.% to 95 wt.%, preferably from 10 wt.% to 40 wt.% of the at least one polysaccharide based on the total dry mass of the third coating layer, more preferably 10 wt.% to 25 wt.%, even more preferably 10 wt.% to 19.9 wt.%, even more preferably 12 wt.% to 18 wt.% and most preferably 15 wt.% to 18 wt.%.
  • the corresponding weight ranges of the at least one polysaccharide ensure an advantageous compromise between an optimal viscosity of the third coating color for producing the third coating color layer and the drying properties of the correspondingly applied third coating color.
  • the polysaccharide, preferably pullulan, in the third coating layer is present in crystalline or semi-crystalline form in order to provide a barrier layer which provides a particularly high barrier effect against fat, oxygen and flavourings.
  • the third coating layer comprises polyvinyl alcohol as a rheology aid, wherein the third coating layer preferably comprises exclusively polyvinyl alcohol.
  • the environmentally friendly packaging material contains a maximum of 5 wt.%, more preferably a maximum of 2.5 wt.%, even more preferably a maximum of 1 wt.%, additionally even more preferably a maximum of 0.1 wt.% and most preferably a maximum of 0.01 wt.% of plastic, wherein the plastic is defined as a polymer to which additives and other substances may have been added and which can function as the main structural component of end products, excluding natural polymers that have not been chemically modified.
  • the environmentally friendly packaging material comprises a maximum of 50 wt.%, preferably a maximum of 40 wt.%, more preferably a maximum of 30 wt.% and most preferably a maximum of 15 wt.% of the first, second and third coating color layers based on the total weight of the environmentally friendly packaging material.
  • the first and/or second and/or third coating color layer comprises at least one excipient, wherein the at least one excipient preferably comprises a natural surfactant, most preferably saponins and/or phospholipids.
  • the surfactant comprises a water-soluble nonionic ethoxylated alcohol, in particular with a solids content between 4 and 15%, wherein the surfactant preferably has the formula RO(CH2CH2O) XH , wherein the substituent R is selected as iso-Ci3H27 and the substituent x is 8 or more; or wherein the substituent R is selected as iso-Cw and the substituent x is selected from the group comprising 5, 6, 7, 8 or 11.
  • the natural surfactant is present in a range from 0.05 wt.% to 3 wt.%, preferably from 0.1 wt.% to 1.0 wt.%, based on the total dry mass of the respective coating color layer.
  • the at least one first coating layer and/or the at least one second coating layer and/or the at least one third coating layer comprises at least one additive which is selected from the group comprising viscosity-controlling agents, preferably dicyandiamides, polyethylene glycol and/or urea as viscosity-reducing agents, or preferably alginate, carboxymethylcellulose and/or acrylic acid esters as viscosity-increasing agents, dispersants, preferably polyphosphate, sodium tripolyphosphate, sodium pyrophosphate, and/or salts of polycarboxylic acids, defoamers, agents for increasing wet strength, preferably melamine-formaldehyde resins, urea-formaldehyde resins, formalin and/or glyoxal, preservatives, preferably antibacterial additives and/or antifungal additives, lubricants, preferably polyglycol, agents for pH control, preferably sodium hydroxide and/or ammonia, dye
  • the at least one additive in the first, second and/or third coating layer is in a range of 0.01 wt.% to 5 wt.%, preferably from 0.1 wt.% to 2 wt.%, based on the respective dry mass of the respective coating color layer.
  • the at least one third coating color layer comprises an inorganic pigment, which is preferably selected from the group comprising natural calcium carbonates (GCC, ground calcium carbonate), precipitated calcium carbonate (PCC, precipitated calcium carbonate), aluminum oxides, aluminum hydroxides, silicas, in particular precipitated and pyrogenic silicas, diatomaceous earths, magnesium carbonates, titanium oxide, bentonite and clay, preferably clay, talc or kaolin.
  • GCC natural calcium carbonates
  • PCC precipitated calcium carbonate
  • aluminum oxides aluminum hydroxides
  • the inorganic pigment of the at least one third coating color layer is platelet-shaped.
  • the at least one inorganic pigment of the at least one third coating color layer has an aspect ratio of 5 to 100, preferably of 15 to 100, more preferably of 20 to 80.
  • the at least one inorganic pigment of the at least one third coating color layer has a particle size distribution of 0.5 ⁇ m to 3.0 ⁇ m.
  • the at least one third coating color layer has a pigment volume concentration (PVC) which is less than a critical pigment volume concentration (CPVC) in order to obtain a continuous three-dimensional film.
  • PVC pigment volume concentration
  • CPVC critical pigment volume concentration
  • the pigment volume concentration (PVC) is from 5 vol.% to 55 vol.%, in particular from 15 vol.% to 30 vol.%.
  • the critical pigment volume concentration (CPVC) is from 50 vol.% to 70 vol.%, in particular from 55 vol.% to 65 vol.%.
  • the third coating layer has a relatively low pigment volume concentration (PVC) below the critical pigment volume concentration (CPVC), so that the binder can effectively embed the pigments within the third coating layer, and thus a continuous third coating layer can be obtained without any noticeable voids, which nevertheless has advantageous properties.
  • PVC pigment volume concentration
  • CPVC critical pigment volume concentration
  • the inorganic pigment of the at least one third coating color layer is present in a range from 1 wt.% to 30 wt.%, preferably 2 to 30 wt.%, based on the total dry mass of the third coating color layer.
  • the at least one third coating color layer does not comprise any polymer, in particular no casein.
  • the environmentally friendly packaging material is designed as a food-safe environmentally friendly packaging material, wherein the food-safe environmentally friendly packaging material in particular meets the standard EN 1186 and/or the standard EN 13130.
  • the European standard EN 1186 and/or the European standard EN 13130 lays down clear rules regarding the permissible migration of components of packaging. packaging material in food. Since the food-safe packaging material according to the present invention meets the corresponding standard, sufficient food safety is guaranteed.
  • the packaging material is designed as a foldable packaging material.
  • a foldable packaging material can be easily and advantageously folded around the goods to be packaged during a packaging process and that the correspondingly folded packaging material retains the folded shape after the packaging process in order to ensure effective packaging of the goods to be packaged.
  • the environmentally friendly packaging material has a basis weight of less than 150 g/m 2 , preferably less than 120 g/m 2 , even more preferably less than 100 g/m 2 , wherein most preferably the basis weight of the environmentally friendly packaging material is between 70 and 80 g/m 2 .
  • the first and/or second and/or third coating color layer each has a basis weight of less than 20 g/m 2 , preferably less than 15 g/m 2 , and wherein the first and/or second coating color layer most preferably each has a basis weight of 3 g/m 2 to 15 g/m 2 .
  • first and/or second and/or third coating layer can be provided.
  • a correspondingly low basis weight of the first and/or second and/or third coating layer ensures in particular that fewer soluble components are available in relation to the entire packaging material.
  • the at least one first coating layer and/or the at least one second coating layer has a basis weight of less than 10 g/m 2 , preferably less than 8 g/m 2 , and most preferably 4 g/m 2 .
  • the basis weight of the at least one first coating color layer is from 1 g/m 2 to 10 g/m 2 , preferably from 2 g/m 2 to 6 g/m 2 .
  • the basis weight of the at least one second coating layer is from 5 g/m 2 to 20 g/m 2 , preferably from 8 g/m 2 to 12 g/m 2 .
  • the at least one third coating layer has a basis weight of less than 20 g/m 2 , preferably less than 15 g/m 2 , and the at least one third coating layer most preferably has a basis weight of 3 g/m 2 to 15 g/m 2 .
  • the at least one third coating color layer comprises at least one preservative, and wherein the preservative preferably comprises a diol, most preferably bronopol.
  • This provides the technical advantage of achieving a longer durability of at least a third coating layer.
  • the at least one third coating layer does not comprise any dodine and/or any guanidine salts as a preservative, wherein in particular unavoidable traces of dodine and/or guanidine salts may be present in the at least one third coating layer.
  • the environmentally friendly packaging material has at least one intermediate layer which is arranged between the at least one second coating color layer and at least one third coating color layer.
  • the at least one intermediate layer comprises at least one binder and at least one pigment, in particular at least one inorganic pigment.
  • the intermediate layer can advantageously improve the structural stability and the barrier effect of the packaging material.
  • the environmentally friendly packaging material has at least one cover layer which is arranged outside the at least one third coating color layer.
  • the cover layer contains at least one of the following components selected from a coating color, an ink, a sealing medium and an adhesive.
  • the packaging material according to the invention can also be metallized in the nanometer range, for example with Al2O3 or Al.
  • the packaging material according to the invention is further preferably characterized in that the at least one cover layer comprises metals, in particular aluminum, and/or metal oxides, in particular aluminum oxide and/or silicon oxide.
  • Additional layers can in particular reduce the permeability of the packaging material according to the invention for other gases and/or form barriers for liquids or viscous substances such as fats, oils, hydrocarbons.
  • the at least one covering layer can in particular: a) comprise at least one hydrophobic polymer, e.g. based on a polyacrylate, a styrene/butadiene copolymer and/or a polyolefin; b) comprise at least one hydrophilic polymer, e.g.
  • a polyvinyl alcohol based on a polyvinyl alcohol
  • c) comprise at least one inorganic pigment and a binder
  • d) comprise amorphous and crystalline regions
  • e) contain or consist of substances selected from the group comprising lipophilic substances, paraffins, in particular hard paraffins, waxes, in particular microcrystalline waxes, waxes based on vegetable oils or fats, vegetable waxes, animal waxes, low molecular weight polyolefins, polyterpenes, and mixtures thereof
  • f) reduce or prevent the transfer of substances, in particular hydrophobic substances, e.g.
  • substances according to point e) above for example to prevent or reduce the transfer of substances from underlying layers to a food, in particular a fatty food; g) be at least heat- or cold-sealable; h) comprise at least one adhesive; i) comprise or consist of at least one thermoplastic material, in particular a heat-sealable material.
  • the at least one first, second and third coating color layer is arranged on the first side of the carrier substrate of the environmentally friendly packaging material, wherein in particular a backside coating color layer is arranged on the second side of the carrier substrate.
  • the at least one backside coating layer comprises a starch layer.
  • the environmentally friendly packaging material is designed as an unsized environmentally friendly packaging material, as an environmentally friendly packaging material glued on one side and/or as an environmentally friendly packaging material glued on both sides, wherein the gluing in particular comprises a starch gluing.
  • the carrier substrate is in particular designed as a satin-finished carrier substrate.
  • the present invention relates to a method for producing an environmentally friendly packaging material comprising the following method steps:
  • 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 polymeric binder, or wherein the at least one first coating color layer comprises at least one polymeric binder and no inorganic pigment;
  • At least one second coating layer to the at least one dried first coating layer, wherein the at least one second coating layer contains at least one inorganic pigment and at least one polymeric binder, or wherein the at least one second coating color layer comprises at least one polymeric binder and no inorganic pigment;
  • the application of the at least one first coating color and/or the application of the at least one second coating color and/or the application of the at least one third coating color is carried out by a large-scale industrial coating machine, wherein the large-scale industrial coating machine in particular has a production speed of more than 1000 meters per minute.
  • This provides the technical advantage that large quantities of packaging material can be provided within a short period of time.
  • the application of the first and/or second and/or third coating color is carried out by means of a curtain coating process or by means of a doctor blade coating process.
  • the application of the first and/or second and/or third coating color is carried out by means of a double-curtain coating process at an operating speed of the coating system of at least 200 m/min. This process is particularly advantageous from an economic point of view and due to the uniform application across the paper web.
  • a freely falling curtain of a coating dispersion is formed.
  • the coating dispersion which is in the form of a thin film (curtain)
  • curtain is "poured" onto a substrate by free fall in order to apply the coating dispersion to the substrate.
  • DE 10 196 052 TI discloses the use of the curtain coating process in the production of information recording materials, whereby multilayer recording layers are realized by applying the curtain, consisting of several coating dispersion films, to substrates.
  • the 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 at 105°C.
  • the drying of the first and/or second and/or third coating color is carried out for a period of 10 seconds to 15 minutes, preferably for a period of 1 minute to 5 minutes, most preferably for 2 minutes and 30 seconds or for 3 minutes.
  • the drying of the first and/or second and/or third coating color is carried out at a curing pressure of 0.2 bar to 3 bar, preferably at a curing pressure of 0.9 bar to 1.1 bar.
  • the first and/or second and/or third coating color is degassed with stirring for a period of 2 minutes to 10 minutes, preferably for a period of 4 minutes, before application.
  • the application of the first and/or second and/or third coating color is carried out at a temperature between 15 °C and 30 °C. According to one embodiment, after application of the first and/or second and/or third coating color, an application weight of at least 6 g/m 2 of the respective first and/or second and/or third coating color is achieved.
  • the embodiments given for the packaging material according to the first aspect are also embodiments for the method for producing the packaging material according to the second aspect and vice versa.
  • Environmentally friendly packaging material can be produced by a process
  • the invention is solved by an environmentally friendly packaging material producible by a method according to the second aspect.
  • the embodiments given for the packaging material according to the first aspect and for the method for producing the packaging material according to the second aspect are also embodiments for the packaging material according to the third aspect.
  • the invention is solved by using an environmentally friendly packaging material according to the first and/or third aspect as packaging, in particular for consumer goods, food, electronic articles and/or tobacco products.
  • the packaging includes in particular wrap-around packaging, tubular bags, lids on a cup or a bowl.
  • the packaging is designed as an inner packaging, which is used, for example, as a replacement for a metallized inner packaging.
  • the packaging is suitable for various applications in the tobacco industry for particularly demanding tobacco products.
  • the packaging is suitable for various applications as secondary packaging and primary packaging for tobacco products such as tobacco volume bags, tobacco pouches and coated tobacco inner liners with barrier.
  • the embodiments given for the packaging material according to the first aspect and for the method for producing the packaging material according to the second aspect are also embodiments for the use of the packaging material according to the fourth aspect.
  • the present invention relates to a third coating color for the indirect or direct coating of a second coating color layer which is applied to a first coating color layer, wherein the first coating color layer is applied to a carrier substrate, the third coating color comprising 10% by weight to 95% by weight of at least one polysaccharide based on the total dry mass of the third coating color; 10% by weight to 90% by weight of at least one rheology aid, in particular a polyol, based on the total dry mass of the third coating color; and at least one liquid, in particular water; wherein the third coating color has a viscosity between 150 mPas and 1300 mPas, and wherein the viscosity of the third coating color is adjusted by the weight ratio of the at least one polysaccharide to the at least one rheology aid, in particular the polyol.
  • the third coating color can be used in a curtain coating process (“coating curtain process”), which can only be used when the applied coating color has a very low viscosity.
  • the viscosity of the third coating color is determined by the weight ratio of the at least one polysaccharide to the at least one rheology aid, in particular polyol, and the viscosity of the coating color is adjusted in that the at least one polysaccharide has different number average degrees of polymerization X n .
  • the viscosity of the third coating color is adjusted not only by adding different weight proportions of at least one polysaccharide and at least one rheology aid, in particular polyol, but also by varying the ratio of the degrees of polymerization of the at least one polysaccharide, which also allows an adjustment of the viscosity of the third coating color.
  • the viscosity of the third coating color is between 200 mPas and 400 mPas or between 800 mPas and 1300 mPas.
  • the third coating color is present as an aqueous solution, as an aqueous dispersion or as an aqueous emulsion.
  • the weight proportion of the at least one polysaccharide of the third coating color is set such that a paper coated with the third coating color, after drying the third coating color to obtain a third coating color layer, 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) a roughness of the environmentally friendly packaging material of 1 to 10 .m, preferably of 1 to 8 .m, more preferably of 2 to 6 .m and most preferably of 3 to 5 .m; b) an oxygen permeability at a temperature of 23°C ⁇ 2°C and an air humidity of 0% according to the standard DIN ISO 15105-2 of less than 10 cm 3 per m 2 per day, preferably less than 8 cm 3 per m 2 per day, and more preferably less than 5 cm 3 per m 2 per day, and most preferably less than 5
  • the embodiments given for the packaging material according to the first aspect and the embodiments given for the method for producing the packaging material according to the second aspect and the embodiments given for the use of the packaging material according to the fourth aspect are also embodiments for the third coating color according to the fifth aspect and vice versa.
  • FIGURES 1 and 2 are identical to FIGURES 1 and 2
  • the environmentally friendly packaging material comprises a carrier substrate having a first side (also referred to as front side) and a second side facing away from the first side (also referred to as back side). Also included is at least one first coating layer, which is arranged on the first and/or second side of the carrier substrate, wherein Figure 1 only shows the variant of an arrangement of the at least one first coating layer on the first side (front side) of the carrier substrate.
  • the invention also alternatively or additionally includes an arrangement of the at least one first coating layer on the second side (back side) of the carrier substrate. Even if Figure 1 only shows the variant of a single first coating layer, the invention naturally also includes the variant of several first coating layers arranged on top of one another.
  • At least one second coating layer which is applied directly, i.e. without an intermediate layer in between, to the at least one first coating layer, wherein Figure 1 only shows the variant of an arrangement of the at least one second coating layer on the first side (front side) of the carrier substrate.
  • the invention also alternatively or additionally includes an arrangement of the at least one second coating layer directly on a corresponding first coating layer on the second side (back side) of the carrier substrate. Even if Figure 1 only shows the variant of a single second coating layer, the invention naturally also includes the variant of several second coating layers arranged on top of one another.
  • At least one third coating layer which is applied directly, i.e. without an intermediate layer in between, or indirectly, i.e. with an intermediate layer in between, to the at least one second coating layer, wherein Figure 1 only shows the variant of an arrangement of the at least one third coating layer on the first side (front side) of the carrier substrate.
  • the invention also alternatively or additionally includes an arrangement of the at least one third coating layer directly or indirectly on a corresponding second coating layer on the second side (back side) of the carrier substrate. Even if Figure 1 only shows the variant of a single third coating layer, the invention naturally also includes the variant of several third coating layers arranged on top of one another.
  • the environmentally friendly packaging material according to the present invention optionally comprises a backing layer which is arranged on the second side (back side) of the carrier substrate, in which case the at least one first, second and third coating color layer are arranged on the first side (front side) of the carrier substrate.
  • FIGS. 2A to 2L show visual representations of surfaces of a first coating layer applied and dried on the carrier substrate, whereby the surfaces were pretreated by means of a burnout test and subsequently subjected to image analysis using the Image J software.
  • the basis weight, or the application weight of a layer was determined by differential weighing between an uncoated carrier substrate and the carrier substrate coated with the layer.
  • the viscosity was determined using a Brookfield viscometer at 23°C and a speed of 100 rpm, at a dry content of 4%.
  • the oxygen transmission rate (OTR) of the respective packaging materials was determined according to DIN ISO 15105-2 at room temperature (23°C ⁇ 2°C).
  • the kink resistance of an external kink or an internal kink of the respective packaging materials was determined after folding with a load of 330 g/cm by visual analysis of the external kink or the internal kink using a scanning electron microscope.
  • the grease-tightness of the respective packaging materials was tested according to standard 513116 using a palm kernel oil grease test.
  • the aroma tightness of the respective packaging materials was determined by gravimetric determination of the hexane vapor transmission rate (HVTR) based on permeability tests of hexane over a period of 24 hours.
  • the hexane vapor transmission test (HVTR) is carried out gravimetrically, using cups in accordance with the DIN 53122-1 standard, which are filled with n-hexane and the sample is clamped in the cup with the coated side facing the n-hexane.
  • the hexane loss is determined by weighing the cup several times over a period of 24 hours over a defined area.
  • the water vapor transmission rate (WVRT) of the respective packaging materials was determined according to ISO 15106-2.
  • the KIT value of the respective packaging materials was determined according to the Tappi T 559 standard.
  • the sealability of the respective packaging materials was determined according to the standard DIN 55529 (2012), whereby the coated paper was sealed at 3.3 bar for 0.3 seconds in the temperature range from 100 °C to 200 °C across the paper grain direction and the seal seam strength was measured. If a qualitative assessment of parameters determined within the framework of the corresponding measurement methods is carried out, an assessment is carried out based on the categories or “very good (++)”.
  • a corresponding coating color was applied to a first side of a carrier substrate made of cellulose, size DIN A3, in an amount of 5 to 10 ml using a film applicator with doctor bars from Erichsen (RK K303 Multicoater) at room temperature.
  • the doctor bars used and thus the wet film application to the dry mass of the coating color used were adjusted so that the desired application weight of the respective coating color layer was achieved.
  • the respective packaging materials were attached to cardboard with a magnet to prevent the paper from rolling up and dried for a period of 3 minutes in a Memmert convection oven (setting: 50% flap; 50% fan) at a temperature of 105 °C in order to obtain the corresponding coating color layer.
  • the at least one first coating color applied directly to the carrier substrate comprises either at least one polymeric binder, such as styrene acrylate, and at least one inorganic pigment, such as ground calcium carbonate, or at least one polymeric binder, such as styrene acrylate, and no inorganic pigment.
  • the at least one first coating color applied directly to the carrier substrate forms the at least one first coating color layer after drying.
  • the at least one second coating color is applied directly to the dried at least one first coating color layer according to the experiments described below and then dried to obtain the at least one second coating color layer.
  • the at least one third coating color is applied directly or indirectly to the dried at least one second coating color layer according to the experiments described below, and then dried to obtain the at least one third coating color layer.
  • the polysaccharide used in the examples for the third coating color comprises exclusively “food-grade” pullulan, which was purchased from Hayashibara Co. Ltd. and used without pretreatment.
  • the polyvinyl alcohol called Baumeister HS 25 used in the examples for the third coating color was purchased and used without pretreatment.
  • the substance called MB46HE used in the examples for the third coating color was purchased and used without pretreatment.
  • the pullulan was dissolved in distilled water while stirring and, depending on the specific experiment, at least one polyol, in particular xylitol and/or sorbitol, was also added.
  • the third coating color was then degassed while stirring with a Hausschild SpeedMixer at a stirring speed of 2000 revolutions per minute for 4 minutes.
  • the reagent ammonium chloride (10%) is applied to the dried at least one first coating layer of an A4-sized paper sample using a smooth doctor blade.
  • the reagent is applied to the side with at least one first coating layer.
  • the paper fibers are carbonized in a drying cabinet at approx. 200 °C for 2 to 5 minutes. The paper fibers darken in the process. While the fibers that are covered by white pigments are not visible as dark spots, the paper fibers appear dark without any covering. The heat is applied evenly across the surface of the sample paper, so that uneven darkening is avoided.
  • the pretreated A4-sized test sheet is scanned at a resolution of 600 dpi. It is then cut in the middle to an image size of, for example, 3400 x 4000 pixels, which corresponds to a sample size of approximately 14 cm x 17 cm (see Figures 2A and 2G), whereby an enlarged section of, for example, 100 x 100 pixels, which corresponds to a sample size of 0.4 x 0.4 cm, is also shown (see Figures 2B and 2H).
  • the image has been converted to a black and white image (8-bit representation), it is converted to a binary image (see Figures 2C and 2D, as well as 2I and 2J). This enables particle detection, i.e.
  • a second coating color was applied directly to a paper carrier substrate coated with 1 g/m 2 thickness to form a second coating color layer after drying with a basis weight of 4 to 6 g/m 2.
  • the second coating color comprises 75.7 wt. % platelet-shaped kaolin (Capim NP) as an inorganic pigment, 22.7 wt. % styrene acrylate (Aronal S 305) as a polymeric binder, and 0.2 wt. % sodium hydroxide, 0.17 wt. % synthetic thickener (Acroflex VX 559), 1.14 wt. % ammonium zirconium carbonate (Allicross AZC), and 0.1 wt. % defoamer (BYK LP 6009).
  • a first coating color was applied directly to an uncoated paper carrier substrate to form the first coating color layer after drying with a basis weight of 4 g/m 2 and a second coating color was applied directly to the dried first coating color layer to form a second coating color layer after drying with a basis weight of 4 to 6 g/m 2.
  • the composition of the second coating color of comparative example 1b corresponds to the composition of the second coating color of comparative example 1a.
  • Comparative Example 1b a different first coating color was used than in Comparative Example 1a, comprising 49.09 wt.% ground calcium carbonate (Hydrocarb 60) as inorganic pigment, 49.11 wt.% styrene acrylate (Aronal S 305) as polymeric binder, and 0.09 wt.% sodium hydroxide, 0.29 wt.% synthetic thickener (Acroflex VX 559), and 1.48 wt.% ammonium zirconium carbonate.
  • Comparative Example 1b differs from Comparative Example 1a by the presence of a first coating color layer.
  • 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, wherein a third coating color was applied to the respective composite structure to form a third coating color layer after drying with a basis weight of 8 g/m 2 , wherein the third coating color exclusively comprises polyvinyl alcohol (Baumeister HS25).
  • the embodiment 2 differs from the comparative example 2 only by the presence of a first coating color layer.
  • HVTR hexane vapor permeability
  • PK ⁇ FT grease tightness
  • KIT value KIT value
  • oxygen permeability is very good in the composite structure according to Comparative Example 2 as well as in the composite structure according to Example 2, or average sealing capabilities are achieved.
  • the oxygen barrier effect of the composite structure according to embodiment 2 (which has a first coating color layer) is greater than that of the composite structure according to comparative example 2 (which does not have a first coating color layer).
  • 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, wherein a third coating color was applied to the respective composite structure to form a third coating color layer after drying with a basis weight of 8 g/m 2 , wherein the third coating color exclusively comprises MB46E.
  • the embodiment 3 differs from the comparative example 3 only by the presence of a first coating color layer.
  • Table 3 As can be seen from Table 3, the hexane vapor permeability (HVTR), the KIT value, and the sealability of the composite structure according to Comparative Example 3 as well as the composite structure according to Embodiment 3 are comparable to average, or even very good.
  • the flavor barrier effect or mineral oil barrier effect of the composite structure according to embodiment 3 is greater than the composite structure according to comparative example 3 (which does not have a first coating color layer).
  • a first coating color was applied directly to an uncoated paper carrier substrate to form the first coating color layer after drying with a basis weight of 4 g/m 2 and a second coating color was applied directly to the dried first coating color layer to form a second coating color layer after drying with a basis weight of 4 g/m 2.
  • the composition of the first and second coating colors of embodiment 4 is identical and comprises clay as an inorganic pigment and comprises a polymeric binder.
  • a third coating color was immediately applied to the dried second coating color layer to form a third coating color layer after drying with a basis weight of 9 g/m 2 .
  • the third coating color comprises an aqueous mixture of 11.2 wt.% pullulan and 4.8 wt.% xylitol (30% solids content of xylitol) based on the dry mass of the third coating color layer.
  • 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.
  • the embodiment 5 is identical to the embodiment 4 and the comparison example 5 is identical to the comparison example 4 except that the third coating color comprises sorbitol as a rheology aid instead of xylitol.
  • 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.
  • the use of two coating layers between the carrier substrate and the third coating layer enables the application weights of the respective first, second and/or third coating layers to be advantageously reduced without any loss of the barrier effect of the environmentally friendly packaging material, thereby reducing the manufacturing costs of the environmentally friendly packaging materials.
  • a corresponding environmentally friendly packaging material can also be advantageously folded and sealed with three different coating layers, which allows a variety of different packaging to be formed.
  • FIGS. 2A to 2L show visual representations of surfaces of a first coating layer applied and dried on the carrier substrate, whereby the surfaces were pretreated using the burnout test described above, and which were subsequently subjected to an image analysis using the ImageJ software as described above.
  • the first coating color used here comprises 75.7 wt.% platelet-shaped kaolin (Capim NP) as inorganic pigment, 22.7 wt.% styrene acrylate (Aronal S 305) as polymeric binder, as well as 0.2 wt.% sodium hydroxide, 0.17 wt.% synthetic thickener (Acroflex VX 559), 1.14 wt.% ammonium zirconium carbonate (Al- licross AZO), as well as 0.1 wt.% defoamer (BYK LP 6009).
  • a first coating color (S1*) with the following composition was used: 75.9% pigment (layered silicate), 22.8% latex (styrene-butadiene latex) and 1.3% rheology modifiers (0.2% acrylate-based thickener, 1.1% zirconium-based crosslinker).
  • Figures 2A to 2F show the surface of a single layer of the first coating color.
  • Figures 2G to 2L show a paper on which a double application of the first coating color has been carried out, with Figures 2G to 2L showing the surface of the outermost layer of the two layers of the first coating color.
  • the at least one second coating layer in particular with the same composition as the first coating layer or as the first coating layer S1*, is applied to the at least one first coating layer or to the first coating layer S1*, a sample pretreatment by means of a burnout test and a subsequent image analysis by means of the ImageJ software is carried out in order to be able to assess the surface quality of the at least one first coating layer.
  • the sections shown in Figures 2A, 2C, 2E, 2G, 2I and 2K show the complete sample with a size of approximately 14 cm x 17 cm, or a number of 3400 x 4000 pixels.
  • the ImageJ software enables the output of the percentage area of particles in the sample section.
  • the percentage area of particles in the sample section is approximately 36% of uncovered base paper.
  • the percentage area of particles in the sample section is only about 4% of uncovered base paper and is thus significantly better than with only a single application of the first coating layer to the base paper.
  • the base paper coverage of approx. 64% with a single application of the first coating layer can be converted to a base paper coverage of approx. 96% with a double application of the first coating layer, which leads to an advantageous quality of the packaging material.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)

Abstract

L'invention concerne un matériau d'emballage respectueux de l'environnement comprenant : un substrat de support ayant un premier côté et un second côté opposé au premier côté ; au moins une première couche de couleur de revêtement agencée sur le premier côté et/ou le second côté du substrat de support, l'au moins une première couche de couleur de revêtement ayant au moins un pigment inorganique et au moins un liant polymère, ou l'au moins une première couche de couleur de revêtement ayant au moins un liant polymère et aucun pigment inorganique ; au moins une deuxième couche de couleur de revêtement qui est appliquée directement sur l'au moins une première couche de couleur de revêtement, l'au moins une deuxième couche de couleur de revêtement ayant au moins un pigment inorganique et au moins un liant polymère, ou l'au moins une seconde couche de couleur de revêtement ayant au moins un liant polymère et aucun pigment inorganique ; au moins une troisième couche de couleur de revêtement qui est appliquée indirectement ou directement sur ladite deuxième couche de couleur de revêtement, ladite troisième couche de couleur de revêtement étant une couche barrière et/ou une couche pouvant être scellée.
PCT/EP2024/066431 2023-06-15 2024-06-13 Matériau d'emballage respectueux de l'environnement Pending WO2024256573A1 (fr)

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US3932192A (en) 1973-09-29 1976-01-13 Sumitomo Chemical Company, Limited Paper coating material containing pullulan
JP2003013391A (ja) 2001-06-26 2003-01-15 Toppan Printing Co Ltd 生分解性を有する紙シート及び紙容器
DE10196052T1 (de) 2000-04-11 2003-02-27 Mitsubishi Paper Mills Ltd Verfahren zur Herstellung eines Informationsaufzeichnungsmaterial und Beschichtungslösungen zur Verwendung in diesem Material
WO2008068779A2 (fr) 2006-12-07 2008-06-12 Shilpan Pravinchandra Patel Emballage à base de film soluble dans l'eau, procédé et appareil pour sceller celui-ci à l'aide d'humidité/vapeur d'eau
US20160222592A1 (en) * 2013-09-10 2016-08-04 Innogel Ag Packaging material having a barrier coating based on starch, and coating mass, method, and device for producing such a barrier coating
EP3795746A1 (fr) * 2019-09-23 2021-03-24 Mitsubishi HiTec Paper Europe GmbH Papier barrière imprimable et scellable à chaud
WO2022003472A1 (fr) 2020-06-30 2022-01-06 Stora Enso Oyj Revêtement barrière pour papier et carton
US20220112664A1 (en) * 2020-10-09 2022-04-14 The Procter & Gamble Company Methods of producing biodegradable and recyclable barrier paper laminate
WO2022103458A1 (fr) 2020-11-11 2022-05-19 Sappi North America, Inc. Produits en papier résistant à l'huile/la graisse
EP4008836A1 (fr) * 2020-12-04 2022-06-08 Potatum Oy Procédé de fabrication d'une feuille revêtue, feuille revêtue, carton-caisse comprenant la feuille revêtue, récipient comprenant la feuille revêtue ou le carton-caisse et utilisation de la feuille revêtue
WO2022269198A1 (fr) 2021-06-23 2022-12-29 Lactips Materiau multicouche pouvant etre utilise comme emballage, comprenant une couche de materiau cellulosique et une couche de materiau comprenant au moins une caseine et/ou au moins un caseinate
US20230068867A1 (en) * 2019-12-06 2023-03-02 Dai Nippon Printing Co., Ltd. Barrier paper, container and lid member containing said barrier paper, and method for producing barrier paper

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Publication number Priority date Publication date Assignee Title
US3932192A (en) 1973-09-29 1976-01-13 Sumitomo Chemical Company, Limited Paper coating material containing pullulan
DE10196052T1 (de) 2000-04-11 2003-02-27 Mitsubishi Paper Mills Ltd Verfahren zur Herstellung eines Informationsaufzeichnungsmaterial und Beschichtungslösungen zur Verwendung in diesem Material
JP2003013391A (ja) 2001-06-26 2003-01-15 Toppan Printing Co Ltd 生分解性を有する紙シート及び紙容器
WO2008068779A2 (fr) 2006-12-07 2008-06-12 Shilpan Pravinchandra Patel Emballage à base de film soluble dans l'eau, procédé et appareil pour sceller celui-ci à l'aide d'humidité/vapeur d'eau
US20160222592A1 (en) * 2013-09-10 2016-08-04 Innogel Ag Packaging material having a barrier coating based on starch, and coating mass, method, and device for producing such a barrier coating
EP3795746A1 (fr) * 2019-09-23 2021-03-24 Mitsubishi HiTec Paper Europe GmbH Papier barrière imprimable et scellable à chaud
US20230068867A1 (en) * 2019-12-06 2023-03-02 Dai Nippon Printing Co., Ltd. Barrier paper, container and lid member containing said barrier paper, and method for producing barrier paper
WO2022003472A1 (fr) 2020-06-30 2022-01-06 Stora Enso Oyj Revêtement barrière pour papier et carton
US20220112664A1 (en) * 2020-10-09 2022-04-14 The Procter & Gamble Company Methods of producing biodegradable and recyclable barrier paper laminate
WO2022103458A1 (fr) 2020-11-11 2022-05-19 Sappi North America, Inc. Produits en papier résistant à l'huile/la graisse
EP4008836A1 (fr) * 2020-12-04 2022-06-08 Potatum Oy Procédé de fabrication d'une feuille revêtue, feuille revêtue, carton-caisse comprenant la feuille revêtue, récipient comprenant la feuille revêtue ou le carton-caisse et utilisation de la feuille revêtue
WO2022269198A1 (fr) 2021-06-23 2022-12-29 Lactips Materiau multicouche pouvant etre utilise comme emballage, comprenant une couche de materiau cellulosique et une couche de materiau comprenant au moins une caseine et/ou au moins un caseinate

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