EP4155459B1 - Papier für schlauchbeutelverpackungsverfahren - Google Patents

Papier für schlauchbeutelverpackungsverfahren Download PDF

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Publication number
EP4155459B1
EP4155459B1 EP21199210.2A EP21199210A EP4155459B1 EP 4155459 B1 EP4155459 B1 EP 4155459B1 EP 21199210 A EP21199210 A EP 21199210A EP 4155459 B1 EP4155459 B1 EP 4155459B1
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EP
European Patent Office
Prior art keywords
coating layer
coated paper
paper product
eaa
talc
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.)
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EP21199210.2A
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English (en)
French (fr)
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EP4155459A1 (de
Inventor
Thomas GILLGREN
Johan Larsson
Wouter PROSPER
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Billerud AB
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Billerud AB
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Filing date
Publication date
Application filed by Billerud AB filed Critical Billerud AB
Priority to EP21199210.2A priority Critical patent/EP4155459B1/de
Priority to US18/696,289 priority patent/US20240401278A1/en
Priority to CN202280063435.3A priority patent/CN117980561A/zh
Priority to EP22789233.8A priority patent/EP4409070B1/de
Priority to PCT/EP2022/076813 priority patent/WO2023046985A1/en
Priority to AU2022349825A priority patent/AU2022349825A1/en
Publication of EP4155459A1 publication Critical patent/EP4155459A1/de
Application granted granted Critical
Publication of EP4155459B1 publication Critical patent/EP4155459B1/de
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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
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed
    • D21H19/822—Paper comprising more than one coating superposed two superposed coatings, both being pigmented
    • 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
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/02—Bags or like containers made of paper and having structural provision for thickness of contents with laminated walls
    • 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
    • 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
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/26—Articles or materials wholly enclosed in laminated sheets or wrapper blanks
    • 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
    • D21H19/12—Coatings without pigments applied as a solution using water as the only solvent, e.g. in the presence of acid or alkaline compounds
    • 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
    • D21H19/385—Oxides, hydroxides or carbonates
    • 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
    • D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed
    • D21H19/826—Paper comprising more than one coating superposed two superposed coatings, the first applied being pigmented and the second applied being non-pigmented
    • 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
    • D21H19/828—Paper comprising more than one coating superposed two superposed coatings, the first applied being non-pigmented and the second applied being pigmented
    • 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 disclosure relates to the field of paper-based materials.
  • Flow wrapping is a horizontal-motion process in which products of any shape are wrapped in a wrapping material. It is used to pack single solid items, such as confectionery bars or multiple products already collated in trays.
  • the wrapping material has been a clear plastic film or a printed opaque plastic film.
  • the package resulting from the flow wrapping process has a longitudinal fin seal and end fin seals. The longitudinal fin seal is typically folded over so that the fin lies flat on the backside wall of the package rather than projecting from it.
  • the present disclosure aims to provide a paper-based material that can replace plastic films in flow wrapping processes.
  • the inventors have realized that such a paper-based material, to be commercially successful, should meet the majority, preferably all, of the following criteria:
  • Fig 1 is a schematic illustration of an embodiment of the coated paper product 1 of the present disclosure.
  • the paper product consists of a paper substrate 101, a first coating layer 102 and a second coating layer 103.
  • the paper is a machine glazed (MG) paper and the first coating layer 101 is applied to the non-glazed side, thereby the glazed side is a printed surface.
  • MG machine glazed
  • a coated paper product for use in a flow wrapping process comprising:
  • the second coating layer is preferably applied on the first coating layer, i.e. directly on top of the first coating layer forming a dual superposed coating arrangement.
  • the paper substrate is preferably a machine-glazed (MG) paper.
  • the MG paper may be calendered.
  • the MG paper is typically a kraft paper, and typically at least 80%, preferably at least 90%, by dry weight of the fibres used to produce the MG paper are never-dried fibres (i.e. virgin fibres).
  • An MG paper has glazed side and a non-glazed side.
  • the glazed side is the side that faced the Yankee cylinder (a polished metal cylinder sometimes referred to as a MG cylinder) used for drying the paper web in the MG papermaking machine.
  • the contact with the polished metal surface during drying makes the glazed side smoother than the non-glazed side.
  • the first coating layer is applied to the less smooth, non-glazed, side of the paper substrate.
  • the second coating layer is applied.
  • the opposite side i.e. the smooth, glazed side, in such case is typically printed. It is beneficial to apply the coating on the non-glazed side to provide the glazed side for printing.
  • the glazed side may be coated with a thin layer of starch ( ⁇ 1 g/m 2 ) for curl prevention.
  • a lacquer may be provided on the optional print, e.g. to modify gloss, friction and/or release properties.
  • the paper substrate may have been treated in a size press or similar to smoothen the surface and thereby avoid too great penetration of the first coating layer into the paper substrate.
  • the grammage measured according to ISO 536:2020 of the paper substrate is 40-60 g/m 2 , such as 42-55 g/m 2 .
  • a suitable thickness (measured according to ISO 534:2011) of the paper substrate is 50-64 ⁇ m, such as 52-61 ⁇ m.
  • a suitable density (measured according to ISO 534:2011) for the paper substrate is 800-900 kg/m 3 .
  • a too high grammage or thickness makes the paper not suitable for a flow wrapping process as the paper should be flexible.
  • a too low density is not suitable either since such paper is too porous for application of a thin barrier.
  • the paper substrate may be bleached, e.g. has an ISO Brightness according to ISO 2470 of at least 77.
  • the first coating may comprise a rheology modifier to facilitate the coating operation.
  • the first coating layer typically comprises pigment and the pigment is preferably talc and/or calcium carbonate (CaCO 3 ).
  • At least 50% by weight of the total pigment content in the second coating layer is talc.
  • the first coating layer comprises EAA or VAcA or SA as well as talc and/or CaCO 3 in the first coating layer and EAA as well as talc in the second coating layer, wherein the dry weight ratio of EAA to talc in the second coating layer is between 100:5 and 100:100.
  • the first coating layer preferably comprises talc in a EAA or VAcA or SA to talc ratio of 100:30 and 100:110, such as between 100:30 and 100:75, or CaCO 3 in a EAA or VAcA or SA to CaCO 3 ratio of 100:20 and 100:70, such as between 100:30 and 100:65.
  • the dry weight ratio of EAA to talc in the second coating layer is preferably between 100:5 and 100:70, such as 100:10 and 100:60, such as 100:15 and 100:60, such as 100:15 and 100:40. It is advantageous with such filler to EAA or VAcA or SA ratios in the first and second coating layers with respect to coating ductility, blocking, and heat-sealability.
  • the coated paper product is typically heat-sealable.
  • EAA is inherently heat-sealable and by addition of a dry weight ratio of EAA to talc in the second coating layer of between 100:5 and 100:100, this heat-sealability is typically maintained. A higher talc content impairs the sealability.
  • the maximum heat seal strength measured according to ASTM F88 & EN 868-5 of the coated paper product is at least 2.8 N measured on a 15 mm test strip sealed for 0.5 s at 160 °C and 3 bar. This means that 2.8 N is required to separate the sealed strip. It is advantageous for the coated paper product to be heat-sealable in order to allow the formation of a flow-wrap packaging by sealing the paper to itself.
  • the second coating layer typically forms a surface to which a sealant layer can be applied, typically a cold-sealant layer.
  • the contact angle between water and the second coating layer surface is preferably less than 95°, such as less than 90°, such as less than 80°.
  • the contact angle may be measured according to TAPPI T 558. This standard stipulates measuring the contact angle at different checkpoints.
  • the contact angle at the 1.0 s checkpoint is selected.
  • the contact angle between di-iodomethane (DIM) and the second coating layer surface is preferably less than 60° and the surface energy is at least 30 mJ/m 2 at the 1.0 s checkpoint measured according to TAPPI T 558.
  • the surface energy is derived from the contact angle measurements by plotting (1+cos ⁇ )/2*( ⁇ L / ⁇ L d ) 1 ⁇ 2 ) vs ( ⁇ L p / ⁇ L d ) 1 ⁇ 2 , wherein ⁇ is the contact angle formed between the liquid drop and solid surface, ⁇ L is the liquid surface tension, and superscripts d and p stand respectively for dispersive and polar components of the liquid surface tension.
  • the points are fitted to a straight line to calculate ⁇ s p and ⁇ s d from the slope and intersection with the vertical axis, respectively.
  • ⁇ s is the solid surface free energy and the surface energy is the sum of ⁇ s p + ⁇ s d .
  • the second coating layer typically can either be heat-sealed without the need for an additional sealant layer or coated by and sealed by an additional sealant layer, typically a cold seal layer.
  • the coat weight of the first coating layer is 4-10 g/m 2 .
  • the coat weight of the second coating layer is 3-9 g/m 2 .
  • the grammage measured according to ISO 536:2020 of the coated paper product is typically 52-71 g/m 2 , such as 56-68 g/m 2 .
  • a suitable thickness (measured according to ISO 534:2011) of the coated paper product is 52-68 ⁇ m, such as 54-66 ⁇ m.
  • a suitable density (measured according to ISO 534:2011) of the coated paper product is 950-1100 kg/m3.
  • the first coating layer comprises EAA to talc in a ratio of between 100:30 and 100:75 and the second coating layer comprises EAA to talc in a ratio of 100:15 to 100:40.
  • Such embodiment is advantageous as it combines barrier properties, barrier crack resistance, blocking resistance, grease resistance, heat sealability and possible application of a sealant layer.
  • the first coating layer comprises VAcA to pigment in a ratio of between 100:30 and 100:75 and the second coating layer comprises EAA to talc in a ratio of 100:15 to 100:70.
  • VAcA to pigment
  • EAA to talc in a ratio of 100:15 to 100:70.
  • Such embodiment is beneficial in terms of combining recyclability with barrier crack resistance, blocking resistance, low ash content and possible application of a sealant layer.
  • the first coating layer comprises VAcA to pigment in a ratio of between 100:30 and 100:75 and the second coating layer comprises EAA to talc in a ratio of 100:15 to 100:40.
  • VAcA to pigment
  • EAA to talc in a ratio of 100:15 to 100:40.
  • Such embodiment is beneficial in terms of combining barrier crack resistance, blocking resistance, grease resistance, recyclability, low ash content and possible application of a sealant layer.
  • a method of producing a coated paper product for use in a flow wrapping process comprising the steps of:
  • the method comprises drying between the application of the first coating layer and the application of the second coating layer. Drying is typically performed with non-contact drying, such as IR and/or hot air, or contact drying, such as a drying cylinder, or a combination of non-contact and contact drying.
  • non-contact drying such as IR and/or hot air
  • contact drying such as a drying cylinder, or a combination of non-contact and contact drying.
  • the coating is typically conducted with blade coating.
  • the coating may also be conducted with rod coating, air-knife coating, rotogravure coating and/or curtain coating.
  • the first and second coating layers may be applied with the same coating technique or different coating techniques.
  • the first and second coating layers may be applied in-line (also referred to as on-line).
  • the productivity is increased by eliminating the handling operations linked to off-line treatment and by eliminating, or at least reducing, the amount of waste.
  • the coating weight is typically below 10 g/m 2 in both the first and second coating layers to allow for sufficient drying between coating steps as well as prior to reeling.
  • a non-blocking coating is in such case also advantageous.
  • a typical product to be packed in the paper-based material of the present disclosure is a protein bar, a snack bar or a chocolate bar.
  • Pigment (talc (Finntalc C15B2), kaolin clay (Barrisurf LX), CaCO 3 (Setacarb HG-ME 75%)) was added to and dispersed in an ethylene acrylic acid (EAA) latex (Michem Flex HS 1130) having a solids content of about 45% or vinyl acetate acrylate copolymer (VAcA) latex (CHP 125) having a solids content of about 50%.
  • EAA ethylene acrylic acid
  • VAcA vinyl acetate acrylate copolymer
  • a machine-glazed (MG) base paper produced from never-dried bleached SW pulp was coated on the non-glazed side with a pilot-scale blade coater.
  • the properties of the MG base paper is shown in Table 1 below.
  • Table 1 Properties of a MG kraft paper produced from never-dried bleached SW pulp.
  • Property Unit Standard method Value Grammage g/m 2 ISO 536 48.15 Thickness ⁇ m ISO 534 56.80 Density kg/m 3 ISO 534 847.71
  • a first coating layer comprising latex and pigment was coated onto the paper.
  • the coated paper was dried by IR and a drying cylinder.
  • a second coating layer comprising latex and pigment was coated so that the paper was coated on one side with a dual superposed coating.
  • the coating was dried by IR, hot air and a drying cylinder.
  • the composition of each coating is presented in Table 2.
  • WVTR water vapour transmission rate
  • HVTR hexane/heptane vapour transmission rate
  • the ductility is measured, i.e. how well the formed barrier resists cracking. The methods is described in detail herein.
  • Rape seed oil was mixed with 1 % colorant (Sudan blue II) and stirred on a magnetic stirrer until fully mixed.
  • 3 samples (14 ⁇ 14 cm) of each coated paper were prepared.
  • the samples were one by one arranged in a folding punch with the barrier side downwards.
  • the folding punch has a V-shaped punch and a V-shaped weight is arranged on top so that when the sample is pushed down by the weight, a 90° fold-line along the entire paper is formed.
  • the weight was applied on the opposite side of the paper from the barrier coating pushing the barrier side downwards.
  • Two additional fold-lines were formed on the paper. All three fold-lines were evenly distributed with a distance of about 4 cm. After the third fold-line had been formed, the paper was turned 90° and three additional fold-lines were made in the same way, thereby obtaining a grid pattern.
  • a blotting paper was arranged with one paper sample on top of the blotting paper.
  • the paper sample had the barrier coated side upwards.
  • the coloured rape seed oil (10 ml) was dosed into the ring and evenly distributed over the paper sample immediately. After 2 minutes the paper sample was taken out from the ring and excess oil was removed with additional blotting papers and lint-free drying paper.
  • DIM contact angle was measured according to TAPPI T 558 on the surface of the second coating layer to evaluate the wetting of the surface.
  • the surface energy is derived from the contact angle measurements by plotting (1+cos ⁇ )/2*( ⁇ L / ⁇ L d ) 1 ⁇ 2 ) vs ( ⁇ L p / ⁇ L d ) 1 ⁇ 2 , wherein ⁇ is the contact angle formed between the liquid drop and solid surface, ⁇ L is the liquid surface tension, and superscripts d and p stand respectively for dispersive and polar components of the liquid surface tension.
  • ⁇ s is the solid surface free energy and the surface energy is the sum of ⁇ s p + ⁇ s d .
  • the contact angle as well as surface energy reflects the ability of the surface to be coated, i.e. wetted, with a sealant layer.
  • the measurement was conducted at the 1.0 s checkpoint. The results are presented in Table 7.
  • a cold-seal (Loctite Liofol CS 22-422, Henkel) was applied onto the second coating by using a lab rod coater. If a uniform coating was formed, i.e. did coating did not form pearls, the surface could be wet by the cold-seal. Table 7. Water contact angle, Di-iodomethane (DIM) contact angle and surface energy.
  • DIM Di-iodomethane
  • the show through times of palm kernel oil is a measure of grease resistance and was measured according to Standard ISO 16532-1. Minimum time as well as average time are presented in Table 8. Table 8. Show through time of palm kernel oil. Sample Average show through (min) Minimum show through (min) 1 313 190 2 130 80 3 243 120 4 213 120 5 165 113 6 189 109 7 103 103 8 70 53 9 193 115 10 160 148 11 90 54 12 537 43 13 48 36 14 576 335 15 60 10 16 182 34
  • the ash content was calculated according: (3% ash in 48 g/m 2 base paper + X1 % pigment in Y1 g/m 2 in first coating layer + X2 % pigment in Y2 g/m 2 second coating layer) / Z g/m 2 ; wherein

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Claims (13)

  1. Beschichtetes Papierprodukt zur Verwendung in einem Schlauchbeutelverpackungsverfahren, aufweisend:
    - ein Papiersubstrat, das eine erste und eine zweite Seite aufweist;
    - eine erste Deckschicht auf der ersten Seite des Papiersubstrats, wobei die erste Deckschicht Ethylen-Acrylsäure (EAA) oder Vinylacetat-Acrylat-Copolymer (VAcA) oder Styrol-Acrylat (SA) aufweist;
    - eine zweite Deckschicht auf der ersten Deckschicht, wobei die zweite Deckschicht EAA und Talk aufweist, und wobei das Trockengewichtsverhältnis von EAA zu Talk in der zweiten Deckschicht zwischen 100:5 und 100:70 liegt;
    - wobei das Beschichtungsgewicht der ersten Deckschicht 4 - 10 g/m2 beträgt;
    - wobei das Beschichtungsgewicht der zweiten Deckschicht 3 - 9 g/m2 beträgt; und
    - wobei das Flächengewicht des Papiersubstrats, gemessen gemäß ISO 536:2020, 40 - 60 g/m2 beträgt.
  2. Beschichtete Papierprodukt nach Anspruch 1, wobei das gemäß ISO 536:2020 gemessene Flächengewicht des Papiersubstrats 42 - 55 g/m2 beträgt.
  3. Beschichtete Papierprodukt nach einem der vorhergehenden Ansprüche, wobei das gemäß ISO 536:2020 gemessene Flächengewicht des beschichteten Papierprodukts 52 - 71 g/m2, beispielsweise 56 - 68 g/m2, beträgt.
  4. Beschichtetes Papierprodukt nach einem der vorhergehenden Ansprüche, wobei das Papiersubstrat ein einseitig geglättetes (MG) Kraftpapier ist.
  5. Beschichtetes Papierprodukt nach Anspruch 4, wobei die erste Seite des Papiersubstrats die nicht geglättete Seite des MG-Papiers ist und wobei die geglättete Seite optional bedruckt ist.
  6. Beschichtetes Papierprodukt nach einem der vorhergehenden Ansprüche, wobei mindestens 80 % Trockengewicht der zur Bildung des Papiersubstrats verwendeten Fasern nie getrocknet sind.
  7. Beschichtetes Papierprodukt nach einem der vorhergehenden Ansprüche, wobei die erste Deckschicht Talk und/oder Calciumcarbonat (CaCO3) aufweist.
  8. Beschichtetes Papierprodukt nach Anspruch 7, wobei die erste Deckschicht Talk in einem Verhältnis von EAA oder VAcA oder SA zu Talk zwischen 100:30 und 100:110, beispielsweise zwischen 100:30 und 100:75, oder CaCO3 in einem Verhältnis von EAA oder VAcA oder SA zu CaCO3 zwischen 100:20 und 100:70, beispielsweise zwischen 100:30 und 100:65, aufweist.
  9. Beschichtetes Papierprodukt nach einem der vorhergehenden Ansprüche, wobei das Trockengewichtsverhältnis von EAA zu Talk in der zweiten Deckschicht zwischen 100:10 und 100:60, beispielsweise zwischen 100:15 und 100:60, beispielsweise zwischen 100:15 und 100:40, beträgt.
  10. Beschichtetes Papierprodukt nach einem der vorhergehenden Ansprüche, wobei das Papierprodukt heißsiegelbar ist.
  11. Beschichtetes Papierprodukt nach Anspruch 10, wobei die maximale Heißsiegelfestigkeit des beschichteten Papierprodukts, gemessen gemäß ASTM F88 & EN 868-5, mindestens 2,8 N beträgt, gemessen an einem 15 mm langen Teststreifen, der 0,5 s lang bei 160 °C und 3 Bar versiegelt wurde.
  12. Verwendung eines beschichteten Papierprodukts nach einem der vorhergehenden Ansprüche zum Schlauchbeutelverpacken eines Produkts.
  13. Verfahren zur Herstellung eines beschichteten Papierprodukts zur Verwendung in einem Schlauchbeutelverpackungsverfahren, aufweisend die Schritte:
    - Bereitstellen eines Papiersubstrats, das eine erste und eine zweite Seite aufweist; und
    - Beschichten der ersten Seite des Papiersubstrats mit einer ersten Deckschicht, wobei die erste Deckschicht Ethylen-Acrylsäure- (EAA) Latex oder Vinylacetat-Acrylat-Copolymer- (VAcA) Latex oder Styrol-Acrylat-(SA) Latex aufweist;
    - Beschichten der ersten Deckschicht mit einer zweiten Deckschicht, wobei die zweite Deckschicht Ethylen-Acrylsäure-Latex (EAA) und Talk aufweist und wobei das Trockengewichtsverhältnis von EAA-Latex zu Talk in der zweiten Deckschicht zwischen 100:5 und 100:70 liegt;
    - wobei das Beschichtungsgewicht der ersten Deckschicht mindestens 4 - 10 g/m2 beträgt;
    - wobei das Beschichtungsgewicht der zweiten Deckschicht mindestens 3 - 9 g/m2 beträgt; Und
    - wobei das Flächengewicht des Papiersubstrats, gemessen gemäß ISO 536:2020, 40 - 60 g/m2 beträgt.
EP21199210.2A 2021-09-27 2021-09-27 Papier für schlauchbeutelverpackungsverfahren Active EP4155459B1 (de)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP21199210.2A EP4155459B1 (de) 2021-09-27 2021-09-27 Papier für schlauchbeutelverpackungsverfahren
US18/696,289 US20240401278A1 (en) 2021-09-27 2022-09-27 Coated Paper
CN202280063435.3A CN117980561A (zh) 2021-09-27 2022-09-27 涂布纸
EP22789233.8A EP4409070B1 (de) 2021-09-27 2022-09-27 Beschichtetes papier
PCT/EP2022/076813 WO2023046985A1 (en) 2021-09-27 2022-09-27 Coated paper
AU2022349825A AU2022349825A1 (en) 2021-09-27 2022-09-27 Coated paper

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EP21199210.2A EP4155459B1 (de) 2021-09-27 2021-09-27 Papier für schlauchbeutelverpackungsverfahren

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EP4155459B1 true EP4155459B1 (de) 2023-12-20

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EP (2) EP4155459B1 (de)
CN (1) CN117980561A (de)
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WO (1) WO2023046985A1 (de)

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US20250215647A1 (en) * 2023-12-29 2025-07-03 Billerud Aktiebolag (Publ) Coated paper

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* Cited by examiner, † Cited by third party
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CA2940370A1 (en) * 2016-08-25 2018-02-25 Cascades Sonoco, Inc. Coated paper-based substrate for containers and process for making the same
EP3409463B1 (de) * 2017-05-31 2020-01-29 Tetra Laval Holdings & Finance S.A. Laminiertes verpackungsmaterial, daraus hergestellte verpackungsbehälter und verfahren zur herstellung des laminatmaterials
EP3710548B1 (de) * 2017-11-17 2023-06-07 Imerys USA, Inc. Heisssiegelbeschichtungen
US20200361196A1 (en) * 2017-11-17 2020-11-19 Imerys Usa, Inc. Heat-seal coatings
WO2019183116A2 (en) * 2018-03-23 2019-09-26 Exxonmobil Chemical Patents Inc. Polymeric coating compositions and articles coated with the same
US11578462B2 (en) * 2018-04-27 2023-02-14 Westrock Mwv, Llc Anti-blocking high barrier paperboard structures

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EP4409070B1 (de) 2025-03-05
EP4409070A1 (de) 2024-08-07
US20240401278A1 (en) 2024-12-05
CN117980561A (zh) 2024-05-03
EP4155459A1 (de) 2023-03-29
AU2022349825A1 (en) 2024-03-07
WO2023046985A1 (en) 2023-03-30
EP4409070C0 (de) 2025-03-05

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