WO2023057359A1 - Sealable packaging paper - Google Patents
Sealable packaging paper Download PDFInfo
- Publication number
- WO2023057359A1 WO2023057359A1 PCT/EP2022/077413 EP2022077413W WO2023057359A1 WO 2023057359 A1 WO2023057359 A1 WO 2023057359A1 EP 2022077413 W EP2022077413 W EP 2022077413W WO 2023057359 A1 WO2023057359 A1 WO 2023057359A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- coated paper
- coated
- packaging
- paper
- weight
- Prior art date
Links
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 52
- 238000000576 coating method Methods 0.000 claims abstract description 82
- 239000011248 coating agent Substances 0.000 claims abstract description 70
- 239000005022 packaging material Substances 0.000 claims abstract description 21
- 229920000642 polymer Polymers 0.000 claims abstract description 9
- 239000000123 paper Substances 0.000 claims description 175
- 239000000835 fiber Substances 0.000 claims description 43
- 238000007789 sealing Methods 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 26
- 230000008569 process Effects 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 12
- 229920002472 Starch Polymers 0.000 claims description 11
- 239000008107 starch Substances 0.000 claims description 11
- 235000019698 starch Nutrition 0.000 claims description 11
- 238000007766 curtain coating Methods 0.000 claims description 8
- 239000006185 dispersion Substances 0.000 claims description 8
- 229920001577 copolymer Polymers 0.000 claims description 6
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 5
- 235000019422 polyvinyl alcohol Nutrition 0.000 claims description 5
- 229920001169 thermoplastic Polymers 0.000 claims description 5
- 239000011230 binding agent Substances 0.000 claims description 4
- 239000000725 suspension Substances 0.000 claims description 4
- 125000005396 acrylic acid ester group Chemical group 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims description 3
- 239000002657 fibrous material Substances 0.000 claims description 3
- 229920000126 latex Polymers 0.000 claims description 3
- 239000000049 pigment Substances 0.000 claims description 3
- 230000019612 pigmentation Effects 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000004416 thermosoftening plastic Substances 0.000 claims description 3
- 244000025254 Cannabis sativa Species 0.000 claims description 2
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 claims description 2
- 244000043261 Hevea brasiliensis Species 0.000 claims description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 2
- 150000001719 carbohydrate derivatives Chemical class 0.000 claims description 2
- 235000014633 carbohydrates Nutrition 0.000 claims description 2
- 150000001720 carbohydrates Chemical class 0.000 claims description 2
- 229920006242 ethylene acrylic acid copolymer Polymers 0.000 claims description 2
- 229920001038 ethylene copolymer Polymers 0.000 claims description 2
- 229920003052 natural elastomer Polymers 0.000 claims description 2
- 229920001194 natural rubber Polymers 0.000 claims description 2
- 229920000098 polyolefin Polymers 0.000 claims description 2
- 239000007858 starting material Substances 0.000 claims description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 2
- 229920003002 synthetic resin Polymers 0.000 claims description 2
- 239000000057 synthetic resin Substances 0.000 claims description 2
- 239000000565 sealant Substances 0.000 claims 2
- 230000000996 additive effect Effects 0.000 claims 1
- 239000007900 aqueous suspension Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000000945 filler Substances 0.000 description 12
- 239000010408 film Substances 0.000 description 9
- 239000000203 mixture Substances 0.000 description 7
- 229920003023 plastic Polymers 0.000 description 6
- 239000004033 plastic Substances 0.000 description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000004094 surface-active agent Substances 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 230000009172 bursting Effects 0.000 description 4
- 238000011049 filling Methods 0.000 description 4
- 239000010893 paper waste Substances 0.000 description 4
- 238000007639 printing Methods 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000011111 cardboard Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 235000013305 food Nutrition 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000002985 plastic film Substances 0.000 description 3
- 229920006255 plastic film Polymers 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000001993 wax Substances 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 2
- 150000001299 aldehydes Chemical class 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000003925 fat Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000012858 packaging process Methods 0.000 description 2
- 229940088417 precipitated calcium carbonate Drugs 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000000518 rheometry Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- BYHQTRFJOGIQAO-GOSISDBHSA-N 3-(4-bromophenyl)-8-[(2R)-2-hydroxypropyl]-1-[(3-methoxyphenyl)methyl]-1,3,8-triazaspiro[4.5]decan-2-one Chemical compound C[C@H](CN1CCC2(CC1)CN(C(=O)N2CC3=CC(=CC=C3)OC)C4=CC=C(C=C4)Br)O BYHQTRFJOGIQAO-GOSISDBHSA-N 0.000 description 1
- 101100313653 Caenorhabditis elegans kat-1 gene Proteins 0.000 description 1
- 229920000298 Cellophane Polymers 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 description 1
- -1 Magnesium silicate hydrates Chemical class 0.000 description 1
- ULUAUXLGCMPNKK-UHFFFAOYSA-N Sulfobutanedioic acid Chemical class OC(=O)CC(C(O)=O)S(O)(=O)=O ULUAUXLGCMPNKK-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000011086 glassine Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 229940042795 hydrazides for tuberculosis treatment Drugs 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000007641 inkjet printing Methods 0.000 description 1
- 239000001023 inorganic pigment Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 150000002924 oxiranes Chemical class 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 238000009516 primary packaging Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000009517 secondary packaging Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 238000001966 tensiometry Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Classifications
-
- 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
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H19/22—Polyalkenes, e.g. polystyrene
-
- 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
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/24—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H19/26—Aminoplasts
-
- 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
-
- 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
- D21H19/58—Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or derivatives thereof
-
- 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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/06—Vegetable or imitation parchment; Glassine paper
-
- 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 invention relates to a coated paper, in particular a translucent coated paper, a method for producing such a coated paper, the use of this coated paper as a packaging material and a packaging comprising the coated paper.
- Packaging generally refers to the cover or (partial or complete) covering of an object, in particular for its protection or for better handling.
- a packaging material includes the material that forms such a package.
- Packaging materials can, for example, be based on paper, plastics and/or metals.
- the present invention relates to paper-based packaging materials.
- the main requirements for packaging materials of any origin are to protect the packaged goods from external influences and to prevent the packaged goods from escaping.
- the packaging material should meet different criteria depending on the packaged goods and the packaging process. Suitable packaging materials should meet mechanical and process-specific requirements and, in the case of sensitive packaged goods, especially food, barrier properties against, for example, water, fat, oxygen or have mineral oil.
- a packaging material should have sufficient tear strength, a suitable coefficient of friction (coefficient of friction) and flexibility, it should either be heat-sealable or compatible with a cold-seal adhesive, it should be printable from the outside and it should not lose its protective effect throughout the conversion and packaging process.
- transparent or at least partially transparent (translucent) packaging materials are always used when, despite the packaging of an object, the object is to remain visible through the packaging. In this way, for example, the object itself or printing on the object can be recognized from the outside despite the packaging, or an inscription or a barcode on the object can be read.
- Transparent or at least partially transparent packaging materials based on plastic films or transparent paper have been known for a long time.
- mail order catalogs or advertising brochures are shrink-wrapped in plastic films or transparent paper and sent by post, with the delivery address and barcode in particular being legible through the packaging.
- transparent paper regularly includes the following papers:
- Paper made from finely ground fibers can be made transparent by impregnating it with drying oils, resins, waxes and/or fats.
- - Vegetable parchment Paper made from cellulose is usually dissolved in a sulfuric acid bath. The dissolved cellulose fills the gaps in the paper, making it transparent. In a final bath, the sulfuric acid is washed out again.
- - Natural tracing paper Natural tracing paper contains greasy ground fibers that are often additionally impregnated. Due to the greasy grinding, these papers react extremely to fluctuations in humidity.
- the object of the present invention is therefore to provide a translucent packaging material that has a sufficiently low opacity so that, for example, the packaged goods or an inscription on the packaged goods can be read through the packaging material, which can be recycled via the waste paper cycle, which has a sufficiently low Has basis weight with sufficient strength and / or has a sufficient seal seam strength.
- the packaging material should preferably be suitable for food contact and for toys and games, biodegradable, can be produced significantly from renewable raw materials, can be produced economically, be suitable for packaging food and can be used in conventional packaging machines without having to change the machine parameters essentially, e.g Use of plastic-based packaging and paper-based packaging on the same packaging machine.
- the packaging material should be sealable on the same sides, or back/back or inside/inside and on opposite sides (front/inside).
- a coated paper according to claim 1 i.e. by a coated paper comprising a base paper containing less than 5% by weight of fillers and a coating color layer applied directly or indirectly to one side of the base paper, the coating color layer being at least comprises or consists of a heat sealable material and the coated paper has a visible opacity of less than 60%.
- the opacity in the visible is less than 55% and more preferably less than 50%.
- the coated paper according to the invention despite its low basis weight, can be used directly in existing packaging machines for packaging packaged goods in plastic packaging without the packaging machine having to be significantly modified.
- the good running properties of the paper mechanical properties
- the required opacity and the good heat-sealability have proven to be advantageous, so that the paper can be used like a normal plastic and can therefore replace the plastic packaging.
- the paper coated according to the invention or a packaging made from it can be easily recycled via the waste paper cycle.
- the terms “includes”, “comprises” and/or “comprising” can also mean “consisting of”, i.e. the presence or addition of one or more other features, steps, elements, components and/or groups is excluded.
- a coated side of a paper is often referred to as a "B" side and an uncoated side of a paper is often referred to as an "A" side.
- the coated paper according to the invention comprises a base paper and a coating color layer applied thereto, the coating color layer comprising at least one polymer, and is characterized in that the coated paper has a visible opacity of less than 60%.
- the opacity in the visible is less than 55% and more preferably less than 50%.
- Opacity is generally understood to mean the opposite of transparency, ie lack of transparency or lack of permeability.
- Opacity in the visible is understood to mean the lack of transparency of light in the visible range. Opacity is therefore the opposite of transparency or transmission.
- Translucency describes a semi-transparency, i.e. an approximate but not complete transparency.
- Opacity can also be represented as the reciprocal of transmission.
- the opacity can be determined according to ISO 2471 (2008).
- the base paper used in the coated paper according to the invention is not restricted.
- the basis weight of the coated paper is 45 g/m 2 or less, in particular 40 g/m 2 or less. Area weights of the coated paper in the range from 30 g/m 2 to 40 g/m 2 are particularly preferred.
- the basis weight can be determined according to ISO 536 (2020-05).
- the opacity of the coated paper can be adjusted via basis weights of this type without exhibiting any disadvantages in terms of structural integrity.
- the base paper can preferably comprise short fibers, long fibers, recycled pulp and/or alternative fiber materials such as grass fibers, Silvie fibers and/or other mechanically or chemically processed fibers, preferably from agricultural residues.
- the base paper comprises short fibers and long fibers and that the weight ratio of short fibers to long fibers is more than 1.
- the weight ratio of short fibers to long fibers is from 60:40 to 70:30.
- Long fiber is preferably a fiber with a fiber length of 2.6 to 4.4 mm and short fiber is preferably a fiber with a fiber length of 0.7 to 2.2 mm.
- the coated paper according to the invention is further characterized in that the base paper contains less than 5% by weight of fillers.
- no fillers can be contained in the base paper either.
- It preferably contains from 0% by weight or from more than 0% by weight to 5% by weight of fillers.
- the % by weight is based on the total weight of the base paper.
- GCC ground calcium carbonate
- PCC precipitated calcium carbonate
- Precarb 105 natural kaolin and/or talc
- customary auxiliaries such as retention aids and/or sizing agents.
- the coated paper according to the invention is characterized in that the coating color layer is heat-sealable.
- the coating color layer comprises at least one thermoplastic polymer.
- coated paper according to the invention is preferably further characterized in that at least one polymer in the coating color layer comprises a thermoplastic, heat-sealable polymer.
- Heat sealing is preferably understood as meaning the joining of two layers of the coated paper by means of the local action of heat.
- the coated paper according to the invention is preferably further characterized in that the at least one heat-sealable material or polymer in the coating color layer is selected from the group comprising polyolefins, vinyl acetate polymers, (modified) vinyl acetate copolymers, polyvinyl alcohols (PVOH), grafted polyvinyl alcohols, ethylene vinyl alcohols, (meth) Acrylate (co)polymers, in particular ethylene-acrylic acid copolymers and styrene-acrylic acid copolymers, acrylic acid esters, (carboxylated) styrene-butadiene copolymers, polyurethanes, carbohydrates and Carbohydrate derivatives, acrylate polymers, acrylic acid esters, aqueous synthetic resin dispersions, thermoplastic ethylene copolymers, natural rubbers and/or polyurethanes.
- the at least one heat-sealable material or polymer in the coating color layer is selected from the group comprising polyolef
- Suitable heat-sealable materials or polymers are, for example, under the trade names Hypod 2000, SealCoat MB46 HE, Cartaseal SWF, SealCoat HS 25, Rhobarr 320, EUKALIN 7238 VD, Decacode Seal, Aquasel 2330, Loctite Liofol CS22-096, Primeseal 22-096, S8128 known.
- the at least one heat-sealable material or polymer is contained in the coating color layer preferably in an amount of 50 to 100% by weight, particularly preferably 80 to 100% by weight, based on the total weight of the coating color layer.
- Waxes and/or inorganic pigments can preferably be present as antiblocking agents.
- the coating color layer can also contain additives such as thickeners, e.g. acrylate-based thickeners, surfactants, e.g. sulfosuccinates, extensional rheology aids, e.g. acrylate-based extensional rheology aids, waxes, e.g Magnesium silicate hydrates or aluminosilicates and/or crosslinking agents such as aldehydes and polyhydric aldehydes, zirconates, polyhydric epoxides, epichlorohydrin resins and/or hydrazides.
- thickeners e.g. acrylate-based thickeners
- surfactants e.g. sulfosuccinates
- extensional rheology aids e.g. acrylate-based extensional rheology aids
- waxes e.g Magnesium silicate hydrates or aluminosilicates and/or cross
- additives are preferably in each case in an amount of 0% or greater than 0% by weight and up to 50% by weight, particularly preferably in an amount of 0% or greater than 0% by weight and 20% by weight on the total weight of the coating color layer.
- the coated paper according to the invention is preferably further characterized in that the coating color layer has a weight per unit area of less than 10 g/m 2 .
- coated paper according to the invention is preferably further characterized in that the coated paper has a cold seal seam strength of more than 3 N/15mm, measured according to DIN 55529 (2012), with sealing B/B side (coated to coated side).
- the coated paper according to the invention is preferably further characterized in that the coated paper has a cold seal seam strength of more than 1.5 N/15mm, measured according to DIN 55529 (2012), with sealing A/B side (uncoated to coated side).
- the seal strength for the coated paper can be determined as follows:
- the coated paper is sealed at 3.3 bar for at least 0.3 s in the temperature range from 100° C. to 200° C. transversely to the direction of paper travel and the seal seam strength is determined according to DIN 55529 (2012).
- the coated paper according to the invention is preferably further characterized in that the coated paper has a Mullen bursting pressure of greater than 150 kPa, particularly preferably greater than 200 kPa.
- the bursting pressure (Mullen) is determined, for example, according to ISO 2758 (2014-12).
- Such a bursting pressure is advantageous since the bursting pressure describes a strength value of the paper and the papers must be characterized by high strengths even at low basis weights. This is necessary in order to be able to be used without any problems in the processing of printing and further processing. For example, no wrinkles may form in rotary printing processes or transfer papers using transfer calenders, and the paper must withstand the corresponding pulls that can affect paper during processing, even with a low basis weight.
- the coated paper according to the invention is preferably further characterized in that the coated paper has a longitudinal breaking force of greater than 40 N/15mm and/or a transverse breaking force of greater than 60 N/15mm, measured according to ISO 1924-2 (2009).
- the coated paper according to the invention is preferably further characterized in that the coated paper has a lengthwise elongation at break of >1.5%, preferably >2% and/or a transverse elongation at break of >4%, preferably >5%, measured according to ISO 1924-2 (2009) , having.
- the coated paper according to the invention is preferably further characterized in that the coated paper has a roughness of ⁇ 5 ⁇ m, preferably ⁇ 4.5 ⁇ m, on the upper side of the coating color layer.
- the roughness can be determined according to ISO 8791-4 (2008-05).
- the coated paper according to the invention is preferably further characterized in that the base paper, preferably on the side to which the coating color layer is applied, has a roughness of ⁇ 7 ⁇ m, preferably ⁇ 6 ⁇ m.
- the coated paper according to the invention is preferably further characterized in that the base paper, preferably on the side to which the coating color layer is not applied, ie on the back, has a roughness of ⁇ 5 ⁇ m, preferably ⁇ 4 ⁇ m.
- the coated paper according to the invention is preferably further characterized in that the coated paper has a thickness of less than 60 ⁇ m.
- Thicknesses of 30 to 50 ⁇ m are particularly preferred.
- the coated paper according to the invention is also characterized in that it offers the possibility, in addition to the visual control of the content through the translucency, to control the content by means of a code printed on the packaged goods.
- the coated paper according to the invention is further characterized in that it offers the possibility of using inkjet printing, for example, to print a code on the outside of the paper and thus to identify goods and to read code contents.
- the present invention also relates to a coated paper, as mentioned above, which is characterized in that between the base paper and the coating color layer there is a primer or a surface pigmentation comprising a polymeric binder, preferably starch and/or latices and/or the addition of pigments, e.g.: CaCOs, is present.
- a primer or a surface pigmentation comprising a polymeric binder, preferably starch and/or latices and/or the addition of pigments, e.g.: CaCOs, is present.
- a primer or a surface pigmentation comprising a polymeric binder, preferably starch and/or latices and/or the addition of pigments, e.g : CaCO 3 , is present.
- test methods for evaluating packaging paper with regard to these criteria on a laboratory scale.
- Common test methods are, for example, the PTS-RH 021:2012 - Category II and the UNI 11743:2019. These provide information about the evaluation of a packaging material with regard to recyclability in common paper recycling plants. They reproduce their process steps on a laboratory scale and evaluate them using a specially developed evaluation system. Process steps are: disintegration - sorting (multiple) - sheet formation.
- the coated paper according to the invention preferably has a minimal proportion of non-paper components which do not cause any problems in the recycling process.
- the coated paper according to the invention thus preferably satisfies the recycling test according to PTS-RH 021:2012 - category II and/or according to UNI 11743:2019.
- the coated paper according to the invention can be obtained economically using known production processes.
- the coated paper according to the invention with a process in which an aqueous dispersion comprising the starting materials of the coating color layer is applied to the base paper, the aqueous application dispersion having a solids content of 20 to 60% by weight, preferably 30% by weight up to 50% by weight, and applied with a curtain coating process, at an operating speed of the coater of at least 200 m/min.
- This method is particularly advantageous from an economic point of view and because of the uniform application over the paper web.
- curtain coating process In the curtain coating process (curtain coating process), a freely falling curtain of a coating dispersion is formed.
- the coating dispersion which is in the form of a thin film (curtain) is "cast” 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 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 onto substrates.
- the aqueous deaerated application suspension has a viscosity of from about 100 to about 100 800 mPa*s (Brookfield, 100 rpm, 20 °C). If the value falls below about 100 mPa*s or the value of about 800 mPa*s is exceeded, this leads to poor runnability of the coating slip on the coating unit.
- the viscosity of the aqueous, deaerated application suspension is particularly preferably about 200 to about 500 mPa*s.
- the surface tension of the aqueous application suspension can be reduced to about 25 to about 70 mN/m, preferably to about 35 to about 60 mN/m (measured based on the standard for bubble pressure tensiometry (ASTM D 3825-90) , as described below). Better control over the coating process is obtained by determining the dynamic surface tension of the coating color and adjusting it by selecting the appropriate surfactant and determining the required amount of surfactant.
- the dynamic surface tension is measured using a bubble pressure tensiometer.
- the maximum internal pressure of a gas bubble that is formed in a liquid via a capillary is measured.
- the internal pressure p of a spherical gas bubble depends on the radius of curvature r and the surface tension o:
- the radius of the capillary is determined using a reference measurement made with a liquid of known surface tension, usually water. If the radius is then known, the surface tension can be calculated from the maximum pressure pmax. Since the capillary is immersed in the liquid, the hydrostatic pressure pO, which results from the immersion depth and the density of the liquid, must be subtracted from the measured pressure (takes place automatically with modern measuring instruments). This results in the following formula for the bubble pressure method:
- the measured value corresponds to the surface tension at a specific surface age, the time from the start of bubble formation to the occurrence of the pressure maximum.
- the generation speed of the bubbles By varying the generation speed of the bubbles, the dependence of the surface tension on the surface age can be recorded, resulting in a curve in which the surface tension is plotted against time.
- the formation of the individual coatings can take place on-line on a paper machine with coating unit or off-line in a separate coating operation on a coating machine.
- the individual layers can also be applied to the base paper using the following methods:
- the coating color layer can be applied to the base paper and/or to existing undercoatings by means of a printing process.
- the coating color layer can be applied to the base paper and/or to existing undercoatings by means of extrusion.
- the coating color layer can be applied to the base paper and/or to pre-coatings that are already present by means of lamination or lining of paper, for example in the form of plastic films.
- the coating color layer and the undercoat can also be applied one after the other over several application steps.
- the uncoated side can be smoothed out by applying heat and/or pressure.
- the present invention also relates to a coated paper which can be obtained using the processes described above.
- the present invention also relates to the use of a coated paper as described above or a coated paper obtainable by the process described above as packaging material, including in a composite with cardboard and/or paperboard.
- coated paper as described above or the coated paper obtainable by the method described above is suitable as packaging material for:
- Playing card packaging is sealed in a packaging type at the A/B side and serves as a direct replacement for e.g. cellophane foil, as playing cards remain recognizable through the packaging, which enables quality control.
- - Playing card packaging in a type of packaging where the B/B side is sealed e.g. in the form of a tubular bag and serves as a direct replacement for traditional foil packaging, as playing cards remain recognizable through the packaging, which enables quality control.
- - Toiletries such as toilet paper.
- the present invention also relates to packaging, comprising a coated paper as described above, also in a composite with cardboard and/or cardboard.
- the packaging can also be a heat-sealed packaging.
- the packaging can also be cold-sealed packaging.
- the packaging preferably has a cold seam seal strength of 3 N/15 mm or more when sealing the side coated with the sealing layer to the side coated with the sealing layer (B/B).
- the packaging preferably has a cold seam seal strength of 1.5 N/15 mm or more when sealing the side coated with the sealing layer to the side not coated with the sealing layer (B/A).
- the paper can be fully or partially coated on one or both sides with a coating from the above material classes in order to (B/A) seal in demanding applications (time ⁇ 1s, pressure ⁇ 3.3 bar; increased temperature, for example 140 ° C cold seam sealing strength > 2 N/15 mm) which require a high sealing force.
- the paper can be partially coated with a coating from the material classes mentioned above on the coated side or on the printed side in order to improve the tightness of the packaging, especially in the triple point (layer jump from 2 to 4 layers; see Figure 8).
- the following coatings were applied to a 35 g/m 2 base paper containing 60% long fibers and 40% short fibers.
- the base paper also contains 2% by weight of filler.
- the primer contains 100% by weight of starch.
- the basis weight of the primer is 1 g/m 2 .
- the coating color layer has the following composition:
- the line color layer has a basis weight of 5 g/m 2 .
- the primer was applied using a film press.
- the coating color layer was applied using a curtain coater.
- the coated paper obtained was examined. The results are presented in the following table:
- a deck of playing cards is wrapped on packaging systems provided for this purpose for fold-wrapping packaging according to FIG.
- the sealing is done lengthwise and crosswise by means of heat sealing bars. Sealing takes place with the inside coated with the sealing layer on the uncoated top (A/B sealing).
- a cold seal seam strength of 1.5 N/15mm is sufficient for this type of packaging.
- the packed deck is then either packed in another box or placed in a suitable compartment in a game box.
- Tubular bag packaging (flowpack):
- the sealing is done lengthwise and crosswise by means of heat sealing bars.
- the sealing takes place with the inside coated with the sealing layer on the inside coated with the sealing layer (B/B sealing).
- a cold seal seam strength of 3 N/15mm is sufficient for this type of packaging.
- the packed cards are then either packed in another box or placed in a suitable compartment in a game box.
- QR codes to identify the possibility of labeling both printed directly on the uncoated side of the paper according to the invention and on a plano filling (e.g. playing card box) and read through the translucent paper.
- a standard HP Office Jet Pro 8210 with the associated HP ink 957 was used as the printer.
- a "REA VeriCube” code reading and testing device was used as the reading device.
- the "TransWin32 V.1.2.0.0/15701r” software was used as the software.
- QR code with little content printed on the uncoated outside of the paper Code content: readable
- the QR code is shown in Figure 3.
- QR code with more extensive content printed on the uncoated outside of the paper Code content: readable
- the QR Code is shown in Figure 4.
- the QR Code is shown in Figure 5.
- QR code with little content and reading through the translucent paper if the paper is not tight against the flat filling. Code content: readable.
- the QR Code is shown in Figure 6.
- QR code with extensive content and reading through the translucent paper with tight-fitting paper to the flat filling. Code content: readable
- the QR Code is shown in Figure 7.
- the base paper also contains 2% by weight of filler.
- the primer contains 100% by weight of starch.
- the basis weight of the primer is 1 g/m 2 .
- the coating color layer has the following composition:
- the coating color layer has a weight per unit area of 5 g/m 2 .
- the primer was applied using a film press.
- the coating color layer was applied using a curtain coater.
- the base paper also contains 2% by weight of filler.
- the primer contains 100% by weight of starch.
- the basis weight of the primer is 1 g/m 2 .
- the coating color layer has the following composition:
- the coating color layer has a weight per unit area of 4 g/m 2 .
- the following coatings were applied to a 25 g/m 2 base paper containing 40% by weight of long fibers and 60% by weight of short fibers.
- the base paper also contains 2% by weight of filler.
- the primer contains 100% by weight of starch.
- the basis weight of the primer is 1 g/m 2 .
- coating color layer :
- the coating color layer has the following composition:
- the coating color layer has a weight per unit area of 3 g/m 2 .
- the primer was applied using a film press.
- the coating color layer was applied using a curtain coater.
- the following coatings were applied to a 30 g/m 2 base paper containing 40% by weight of long fibers and 60% by weight of short fibers.
- the base paper also contains 2% by weight of filler.
- the primer contains 100% by weight of starch.
- the basis weight of the primer is 1 g/m 2 .
- coating color layer :
- the line color layer has the following composition:
- the coating color layer has a weight per unit area of 4 g/m 2 .
- the primer was applied using a film press.
- the coating color layer was applied using a curtain coater.
- the following coatings were applied to a 30 g/m 2 base paper containing 40% by weight of long fibers and 60% by weight of short fibers.
- the base paper also contains 2% by weight of filler.
- the primer contains 100% by weight of starch.
- the basis weight of the primer is 1 g/m 2 .
- coating color layer :
- the coating color layer has the following composition:
- the coating color layer has a weight per unit area of 3 g/m 2 .
- the primer was applied using a film press.
- the coating color layer was applied using a curtain coater.
- the base paper also contains 2% by weight of filler.
- the primer contains 100% by weight of starch.
- the basis weight of the primer is 1 g/m 2 .
- the coating color layer has the following composition:
- the coating color layer has a weight per unit area of 4 g/m 2 .
- the primer was applied using a film press.
- the coating color layer was applied using a curtain coater.
- sealing media can be replaced by other sealing media in accordance with the present application.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paper (AREA)
- Laminated Bodies (AREA)
- Wrappers (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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JP2024518739A JP2024537743A (en) | 2021-10-06 | 2022-09-30 | Sealable wrapping paper |
EP22800156.6A EP4413201A1 (en) | 2021-10-06 | 2022-09-30 | Sealable packaging paper |
CN202280065634.8A CN118202116A (en) | 2021-10-06 | 2022-09-30 | Sealable packaging paper |
KR1020247014574A KR20240070673A (en) | 2021-10-06 | 2022-09-30 | sealable packaging paper |
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DE102021125950.9 | 2021-10-06 | ||
DE102021125950.9A DE102021125950A1 (en) | 2021-10-06 | 2021-10-06 | Sealable packaging paper |
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WO2023057359A1 true WO2023057359A1 (en) | 2023-04-13 |
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PCT/EP2022/077413 WO2023057359A1 (en) | 2021-10-06 | 2022-09-30 | Sealable packaging paper |
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EP (1) | EP4413201A1 (en) |
JP (1) | JP2024537743A (en) |
KR (1) | KR20240070673A (en) |
CN (1) | CN118202116A (en) |
DE (1) | DE102021125950A1 (en) |
WO (1) | WO2023057359A1 (en) |
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WO2024217958A1 (en) * | 2023-04-17 | 2024-10-24 | Mondi Ag | Packaging web material, packaging pouch and process for forming a packaging pouch |
Citations (8)
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DE102004002207A1 (en) * | 2004-01-15 | 2005-08-11 | Papierfabrik August Koehler Ag | Producing decorative paper with a pigment coating, useful for making decorative laminates, comprises contactless application of an aqueous color coating composition onto a coating base paper by curtain coating |
EP1747898A1 (en) * | 2004-05-17 | 2007-01-31 | Oji Paper Company Limited | Thermal transfer image receiving sheet |
WO2015140097A1 (en) * | 2014-03-17 | 2015-09-24 | Tetra Laval Holdings & Finance S.A. | Coating composition, printed packaging laminate, method for manufacturing of the packaging laminate and packaging container |
DE102014119572A1 (en) * | 2014-12-23 | 2016-06-23 | Delfortgroup Ag | Environmentally friendly packaging paper for food |
WO2017089506A1 (en) * | 2015-11-27 | 2017-06-01 | Tetra Laval Holdings & Finance S.A. | Method for manufacturing a laminated packaging material, the laminated packaging material and packaging containers made therefrom |
EP3246370A1 (en) * | 2016-05-17 | 2017-11-22 | Evonik Röhm GmbH | Heat-sealable binder |
WO2019123290A1 (en) * | 2017-12-21 | 2019-06-27 | Stora Enso Oyj | Heat-sealable packaging material |
EP3789538A1 (en) * | 2019-09-03 | 2021-03-10 | Constantia Pirk GmbH & Co. KG | Resuspendable paper laminate and method for producing the same |
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DE10196052T1 (en) | 2000-04-11 | 2003-02-27 | Mitsubishi Paper Mills Ltd | Process for the preparation of an information recording material and coating solutions for use in this material |
JP2017124564A (en) | 2016-01-15 | 2017-07-20 | 王子ホールディングス株式会社 | Heat seal sheet and press-through package |
ES2903075T3 (en) | 2017-11-14 | 2022-03-31 | Aw Branding Ltd | Recyclable and refillable translucent or transparent paper for use in packaging applications |
-
2021
- 2021-10-06 DE DE102021125950.9A patent/DE102021125950A1/en active Pending
-
2022
- 2022-09-30 CN CN202280065634.8A patent/CN118202116A/en active Pending
- 2022-09-30 KR KR1020247014574A patent/KR20240070673A/en unknown
- 2022-09-30 WO PCT/EP2022/077413 patent/WO2023057359A1/en active Application Filing
- 2022-09-30 JP JP2024518739A patent/JP2024537743A/en active Pending
- 2022-09-30 EP EP22800156.6A patent/EP4413201A1/en active Pending
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102004002207A1 (en) * | 2004-01-15 | 2005-08-11 | Papierfabrik August Koehler Ag | Producing decorative paper with a pigment coating, useful for making decorative laminates, comprises contactless application of an aqueous color coating composition onto a coating base paper by curtain coating |
EP1747898A1 (en) * | 2004-05-17 | 2007-01-31 | Oji Paper Company Limited | Thermal transfer image receiving sheet |
WO2015140097A1 (en) * | 2014-03-17 | 2015-09-24 | Tetra Laval Holdings & Finance S.A. | Coating composition, printed packaging laminate, method for manufacturing of the packaging laminate and packaging container |
DE102014119572A1 (en) * | 2014-12-23 | 2016-06-23 | Delfortgroup Ag | Environmentally friendly packaging paper for food |
WO2017089506A1 (en) * | 2015-11-27 | 2017-06-01 | Tetra Laval Holdings & Finance S.A. | Method for manufacturing a laminated packaging material, the laminated packaging material and packaging containers made therefrom |
EP3246370A1 (en) * | 2016-05-17 | 2017-11-22 | Evonik Röhm GmbH | Heat-sealable binder |
WO2019123290A1 (en) * | 2017-12-21 | 2019-06-27 | Stora Enso Oyj | Heat-sealable packaging material |
EP3789538A1 (en) * | 2019-09-03 | 2021-03-10 | Constantia Pirk GmbH & Co. KG | Resuspendable paper laminate and method for producing the same |
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EP4413201A1 (en) | 2024-08-14 |
KR20240070673A (en) | 2024-05-21 |
CN118202116A (en) | 2024-06-14 |
JP2024537743A (en) | 2024-10-16 |
DE102021125950A1 (en) | 2023-04-06 |
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