[go: up one dir, main page]

EP4409070B1 - Beschichtetes papier - Google Patents

Beschichtetes papier Download PDF

Info

Publication number
EP4409070B1
EP4409070B1 EP22789233.8A EP22789233A EP4409070B1 EP 4409070 B1 EP4409070 B1 EP 4409070B1 EP 22789233 A EP22789233 A EP 22789233A EP 4409070 B1 EP4409070 B1 EP 4409070B1
Authority
EP
European Patent Office
Prior art keywords
coating layer
coated paper
paper product
product
paper
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.)
Active
Application number
EP22789233.8A
Other languages
English (en)
French (fr)
Other versions
EP4409070A1 (de
Inventor
Thomas GILLGREN
Johan Larsson
Wouter PROSPER
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.)
Billerud AB
Original Assignee
Billerud AB
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 Billerud AB filed Critical Billerud AB
Publication of EP4409070A1 publication Critical patent/EP4409070A1/de
Application granted granted Critical
Publication of EP4409070B1 publication Critical patent/EP4409070B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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 vertical form fill sealing (VFFS) machine is a type of automated assembly-line product packaging system. It is commonly used in the packaging industry for food and a wide variety of other products. The machine often constructs plastic bags out of a flat roll of plastic film, while simultaneously filling the bags with product and sealing the filled bags. Both solids and liquids can be bagged using this packaging system.
  • the present disclosure aims to provide a paper-based material that can replace plastic films in packaging in for example flow wrapping processes, sealed paper bags, e-commerce bags, tissue wrapping and bedding wrappings.
  • 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.
  • a coated paper product 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 typically a machine-glazed (MG) paper or a machine finished (MF) paper.
  • the paper substrate may be calendered.
  • the MG or MF 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 or MF 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.
  • An MF paper is produced by a drying technique using a large number of smaller, steam-heated cylinders to dry the paper which is alternately wrapped one way and then the other way so that both sides of the paper receive the same finish.
  • the finish on both sides of an MF paper is similar to the non-glazed side of an MG paper.
  • 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 typically 40-135 g/m 2 , 40-100 g/m 2 , such as 40-90 g/m 2 , such as 40-60 g/m 2 , such as 42-55 g/m 2 .
  • a suitable density (measured according to ISO 534:2011) for the paper substrate is 800-900 kg/m 3 .
  • a too low density is disadvantageous since such paper is too porous for application of a thin barrier.
  • a suitable thickness (measured according to ISO 534:2011) of the paper substrate is 50-64 ⁇ m, such as 52-61 ⁇ m.
  • a too high grammage or thickness makes the paper not suitable for a flow wrapping process as the paper should be flexible.
  • 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 or acrylic latex 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 100:70.
  • the first coating layer may also be free of pigments.
  • the first coating layer preferably comprises talc in a EAA or VAcA or SA or acrylic latex 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 or acrylic latex 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 100:10 and 100:70, such as between 100:10 and 100:60, such as between 100:15 and 100:60, such as between 100:15 and 100:40. It is advantageous with such filler to EAA or VAcA or SA or acrylic latex ratios in the first and second coating layers with respect to coating ductility, blocking, barrier properties 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 100:70, this heat-sealability is typically maintained.
  • a higher talc content impairs the sealability as well as the barrier crack resistance.
  • 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.
  • ⁇ s is the solid surface free energy and the surface energy is the sum of ⁇ g 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 typically 4-10 g/m 2 .
  • the coat weight of the second coating layer is typically 3-9 g/m 2 .
  • the grammage measured according to ISO 536:2020 of the coated paper product is typically 52-142 g/m 2 , 52-110 g/m 2 , such as 52-95 g/m 2 , such as 52-71 g/m 2 , such as 56-68 g/m 2 .
  • a suitable density (measured according to ISO 534:2011) of the coated paper product is 950-1100 kg/m 3 .
  • a suitable thickness (measured according to ISO 534:2011) of the coated paper product is 52-68 ⁇ m, such as 54-66 ⁇ m.
  • 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.
  • the first coating layer comprises acrylic latex to pigment in a ratio between 100:30 and 100:110 and the second coating layer comprises EAA to talc in a ratio between 100:50 and 100:70.
  • Such embodiment is beneficial in terms of combining mineral oil barrier properties as well as water vapour barrier properties with barrier crack resistance, blocking resistance, grease resistance, recyclability and possible application of a sealant layer.
  • a flow-wrapped product obtained by flow-wrapping a product in a coated paper product according to the first aspect, wherein the flow-wrapped product has a longitudinal fin seal and end fin seals.
  • a sealed bag such as a gusseted bag or a pillow bag, having a longitudinal seal and each end portion is sealed by a fin seal produced from a coated paper product according to the first aspect.
  • a filled gusseted bag is obtainable from a VFFS machine.
  • Such bag has a longitudinal seal adhering two overlapping ends of the paper material to each other to form a lap seal.
  • the longitudinal seal is a fin seal.
  • the bag has a top end sealed by a fin seal and a bottom end sealed by a fin seal.
  • a filled pillow bag is obtainable from a VFFS machine.
  • Such bag has a longitudinal seal adhering two overlapping ends of the paper material to each other to form a lap seal.
  • the longitudinal seal is a fin seal.
  • the bag has a top end sealed by a fin seal and a bottom end sealed by a fin seal.
  • a coated paper product according to the first aspect for wrapping a product, such as flow-wrapping a product, in sealable paper bags, such as a gusseted bag or a pillow bag, in e-commerce packaging, in bedding packaging, such as pillow packaging, or in tissue wrapping.
  • 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 flow-wrapped in the paper-based material of the present disclosure is a protein bar, a snack bar or a chocolate bar.
  • a typical product to be packed in a sealed barrier bag made from the paper-based material of the present disclosure are dry foods, such as confectionary or baked goods.
  • the product is cosmetics and toiletries.
  • 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% or acrylic latex (Rhobarr 214, DOW) having a solids content of about 45%.
  • EAA ethylene acrylic acid
  • VAcA vinyl acetate acrylate copolymer
  • CHP 125 vinyl acetate acrylate copolymer
  • acrylic latex Rabarr 214, DOW
  • 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 for samples 1-17 & 20-23.
  • 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
  • sample 18-19 Two samples (sample 18-19) were produced by coating a machine finished (MF) base paper with a grammage of 70 g/m 2 (sample 18) and a grammage of 80 g/m 2 (sample 19) in the same way as on the MG base paper.
  • MF machine finished
  • a first coating layer comprising latex and pigment (samples 1-16 & 18-22) or latex but no pigment (sample 17) was coated onto the paper.
  • the coated paper was dried by IR and a drying cylinder.
  • a second coating layer comprising latex and pigment (samples 1-18 & 22-23) or latex but no pigment (samples 20-21) 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.
  • Table 2 The composition of each coating is presented in Table 2.
  • WVTR water vapour transmission rate
  • HVTR hexane/heptane vapour transmission rate
  • Rape seed oil was mixed with 1% colorant (Sudan blue II) and stirred on a magnetic stirrer until fully mixed.
  • 3 samples (14x14 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.
  • a high barrier crack resistance in combination with blocking resistance as well as good barrier properties against both water vapour and mineral oil was obtained for both pigmented pre-coating (samples 11-16, 18-19 & 23) as well as a pre-coating free of pigments (sample 17).
  • 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.
  • the total surface energy is the key factor to wetting. Moreover, it is believed by the inventors that it is the top-coating that contributes the most to the total surface energy. A similar top-coat to that in samples 9-11 is therefore fair to assume that such top-coat is also wettable with a cold-seal. Table 7. Water contact angle, Di-iodomethane (DIM) contact angle and surface energy.
  • DIIM 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 17 18 1044 281 19 603 20 21 22 49 37 23 379 93
  • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Paper (AREA)

Claims (16)

  1. Beschichtetes Papierprodukt, aufweisend:
    - ein Papiersubstrat, das eine erste und eine zweite Seite aufweist;
    - eine erste Beschichtungsschicht auf der ersten Seite des Papiersubstrats, wobei die erste Beschichtungsschicht Ethylen-Acrylsäure (EAA) oder Vinylacetat-Acrylat-Copolymer (VAcA) oder Styrol-Acrylat (SA) oder Acryllatex aufweist; und
    - eine zweite Beschichtungsschicht auf der ersten Beschichtungsschicht, wobei die zweite Beschichtungsschicht EAA und Talk aufweist, und wobei das Trockengewichtsverhältnis von EAA zu Talk in der zweiten Beschichtungsschicht zwischen 100:5 und 100:70 liegt,
    - wobei das Auftragsgewicht der ersten Beschichtungsschicht mindestens 4 g/m2 beträgt, und
    - wobei das Auftragsgewicht der zweiten Beschichtungsschicht mindestens 3 g/m2 beträgt.
  2. Beschichtetes Papierprodukt nach Anspruch 1, wobei das Beschichtungsgewicht der ersten Beschichtungsschicht 4-10 g/m2 beträgt.
  3. Beschichtetes Papierprodukt nach einem der vorhergehenden Ansprüche, wobei das Auftragsgewicht der zweiten Beschichtungsschicht 3-9 g/m2 beträgt.
  4. Beschichtete Papierprodukt nach einem der vorhergehenden Ansprüche, wobei die Grammatur des Papiersubstrats, gemessen nach ISO 536:2020, 40-135 g/m2, beispielsweise 40-100 g/m2, beispielsweise 40-90 g/m2, beispielsweise 40-60 g/m2, beispielsweise 42-55 g/m2 beträgt.
  5. Beschichtetes Papierprodukt nach einem der vorhergehenden Ansprüche, wobei die Grammatur des beschichteten Papierprodukts, gemessen nach ISO 536:2020, 52-142 g/m2, beispielsweise 52-110 g/m2, beispielsweise 52- 95 g/m2, beispielsweise 52-71 g/m2, beispielsweise 56-68 g/m2 beträgt.
  6. Beschichtetes Papierprodukt nach einem der vorhergehenden Ansprüche, wobei das Papiersubstrat ein maschinenglasiertes (MG) Kraftpapier oder ein maschinenveredeltes (MF) Kraftpapier ist.
  7. Beschichtetes Papierprodukt nach Anspruch 8, wobei das Papiersubstrat ein MG-Papier ist und die erste Seite des Papiersubstrats die nicht-glänzende Seite des MG-Papiers ist und wobei die glänzende Seite optional bedruckt ist.
  8. Beschichtetes Papierprodukt nach einem der vorhergehenden Ansprüche, wobei mindestens 80 Trocken-Gew.-% der zur Bildung des Papiersubstrats verwendeten Fasern nie getrocknet sind.
  9. Beschichtetes Papierprodukt nach einem der vorhergehenden Ansprüche, wobei die erste Beschichtungsschicht Talk und/oder Calciumcarbonat (CaCO3) aufweist.
  10. Beschichtetes Papierprodukt nach Anspruch 9, wobei die erste Beschichtungsschicht Talk in einem Verhältnis von EAA oder VAcA oder SA oder Acryllatex 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 oder Acryllatex zu CaCO3 zwischen 100:20 und 100:70, beispielsweise zwischen 100:30 und 100:65. aufweist.
  11. Beschichtetes Papierprodukt nach einem der vorhergehenden Ansprüche, wobei das Trockengewichtsverhältnis von EAA zu Talk in der zweiten Beschichtungsschicht zwischen 100:10 und 100:70, beispielsweise zwischen 100:10 und 100:60, beispielsweise zwischen 100:15 und 100:60, beispielsweise zwischen 100:15 und 100:40 beträgt.
  12. Beschichtetes Papierprodukt nach einem der vorhergehenden Ansprüche, wobei das Papierprodukt heißsiegelbar ist.
  13. Beschichtetes Papierprodukt nach Anspruch 12, wobei die maximale Heißsiegelfestigkeit, gemessen nach ASTM F88 und EN 868-5, des beschichteten Papierprodukts 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.
  14. Versiegelter Beutel, hergestellt aus einem beschichteten Papierprodukt nach einem der Ansprüche 1 bis 13, wie etwa ein Seitenfaltenbeutel oder ein Kissenbeutel, der eine Längsversiegelung aufweist und bei dem jeder Endabschnitt durch eine Flossenversiegelung versiegelt ist.
  15. Verwendung eines beschichteten Papierprodukts nach einem der Ansprüche 1 bis 13 zum Verpacken eines Produkts, beispielsweise zum Verpacken eines Produkts als Schlauchbeutel, in verschließbare Papierbeutel, beispielsweise einen Seitenfaltenbeutel oder einen Kissenbeutel, in Verpackungen für den elektronischen Handel, in Bettwarenverpackungen, wie beispielsweise Kissenverpackungen, oder in Tissueverpackungen.
  16. Verfahren zur Herstellung eines beschichteten Papierprodukts, aufweisend die Schritte:
    - Bereitstellen eines Papiersubstrats, das eine erste und eine zweite Seite aufweist; und
    - Beschichten der ersten Seite des Papiersubstrats mit einer ersten Beschichtungsschicht, wobei die erste Beschichtungsschicht Ethylen-Acrylsäure-Latex (EAA) oder Vinylacetat-Acrylat-Copolymer-Latex (VAcA) oder Styrol-Acrylat-Latex (SA) oder Acryllatex aufweist; und
    - Auftragen einer zweiten Beschichtungsschicht auf die erste Beschichtungsschicht, wobei die zweite Beschichtungsschicht Ethylen-Acrylsäure- (EAA) Latex und Talk aufweist, und wobei das Trockengewichtsverhältnis von EAA-Latex zu Talkum in der zweiten Beschichtungsschicht zwischen 100:5 und 100:70 liegt,
    - wobei das Auftragsgewicht der ersten Beschichtungsschicht mindestens 4 g/m2 beträgt, und
    - wobei das Auftragsgewicht der zweiten Beschichtungsschicht mindestens 3 g/m2 beträgt.
EP22789233.8A 2021-09-27 2022-09-27 Beschichtetes papier Active EP4409070B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP21199210.2A EP4155459B1 (de) 2021-09-27 2021-09-27 Papier für schlauchbeutelverpackungsverfahren
PCT/EP2022/076813 WO2023046985A1 (en) 2021-09-27 2022-09-27 Coated paper

Publications (2)

Publication Number Publication Date
EP4409070A1 EP4409070A1 (de) 2024-08-07
EP4409070B1 true EP4409070B1 (de) 2025-03-05

Family

ID=77998771

Family Applications (2)

Application Number Title Priority Date Filing Date
EP21199210.2A Active EP4155459B1 (de) 2021-09-27 2021-09-27 Papier für schlauchbeutelverpackungsverfahren
EP22789233.8A Active EP4409070B1 (de) 2021-09-27 2022-09-27 Beschichtetes papier

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP21199210.2A Active EP4155459B1 (de) 2021-09-27 2021-09-27 Papier für schlauchbeutelverpackungsverfahren

Country Status (5)

Country Link
US (1) US20240401278A1 (de)
EP (2) EP4155459B1 (de)
CN (1) CN117980561A (de)
AU (1) AU2022349825A1 (de)
WO (1) WO2023046985A1 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
EP3768787B1 (de) * 2018-03-23 2024-07-17 ExxonMobil Chemical Patents Inc. Polymere beschichtungszusammensetzungen und damit beschichtete gegenstände
US11578462B2 (en) * 2018-04-27 2023-02-14 Westrock Mwv, Llc Anti-blocking high barrier paperboard structures

Also Published As

Publication number Publication date
AU2022349825A1 (en) 2024-03-07
EP4155459B1 (de) 2023-12-20
EP4155459A1 (de) 2023-03-29
WO2023046985A1 (en) 2023-03-30
EP4409070A1 (de) 2024-08-07
US20240401278A1 (en) 2024-12-05
CN117980561A (zh) 2024-05-03

Similar Documents

Publication Publication Date Title
US6531196B1 (en) Coated board, a process for its manufacture, and containers and packaging formed therefrom
US7954306B2 (en) Grease masking packaging materials and methods thereof
JP7520020B2 (ja) ヒートシール可能な板紙
JP2012508330A (ja) リサイクル可能な塗工紙または塗工板紙及びその製造方法
MX2010012918A (es) Carton de baja densidad.
US20100266819A1 (en) Basecoat and Associated Paperboard Structure Including A Pigment Blend of Hyper-Platy Clay and Calcined Clay
US20230303890A1 (en) Paper Product for Flow Wrapping
EP4409070B1 (de) Beschichtetes papier
EP4435178A1 (de) Beschichtetes barrierepapier
EP4435177A1 (de) Beschichtetes barrierepapier
Kirwan Paper and Paperboard‐Raw Materials, Processing and Properties
JP2022024905A (ja) ヒートシール紙及び包装材
WO2024121097A1 (en) Heat sealable coated paper product
US20250025350A1 (en) Heat-sealable paper
JP7562954B2 (ja) 包装袋及びその製造方法
JP2023107678A (ja) ヒートシール紙及び包装材
JP2023107689A (ja) ヒートシール紙及び包装材
Kogler et al. Coating of paper and board
WO2024038332A1 (en) Paperboard-based disposable cup arranged with an interior layer with a low pps-value
EP4428300A1 (de) Barrierepapiere
AU2022207259A1 (en) Vapor deposition paper and method for producing same
MXPA99004987A (en) Dual packing material hornea

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: UNKNOWN

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20240418

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
INTG Intention to grant announced

Effective date: 20241014

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602022011521

Country of ref document: DE