WO2014005697A2 - A recyclable sheet material and a container thereof - Google Patents

A recyclable sheet material and a container thereof Download PDF

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Publication number
WO2014005697A2
WO2014005697A2 PCT/EP2013/001932 EP2013001932W WO2014005697A2 WO 2014005697 A2 WO2014005697 A2 WO 2014005697A2 EP 2013001932 W EP2013001932 W EP 2013001932W WO 2014005697 A2 WO2014005697 A2 WO 2014005697A2
Authority
WO
WIPO (PCT)
Prior art keywords
coating
water barrier
sheet material
dried
paper board
Prior art date
Application number
PCT/EP2013/001932
Other languages
French (fr)
Other versions
WO2014005697A3 (en
Inventor
Aad Hoekstra
Risto Vapola
Original Assignee
Huhtamäki Oyj
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 Huhtamäki Oyj filed Critical Huhtamäki Oyj
Priority to EP13733228.4A priority Critical patent/EP2870288A2/en
Publication of WO2014005697A2 publication Critical patent/WO2014005697A2/en
Publication of WO2014005697A3 publication Critical patent/WO2014005697A3/en
Priority to US14/588,241 priority patent/US20150111011A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
    • B65D3/22—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines with double walls; with walls incorporating air-chambers; with walls made of laminated material
    • 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
    • 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
    • D21H19/80—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
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24893—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including particulate material
    • Y10T428/24901—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including particulate material including coloring matter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree

Definitions

  • the present invention relates to a recyclable, preferably repulpable sheet material as defined below and a container, preferably a cup, based essentially on cellulosic material for water containing foodstuff formed of such recyclable sheet material comprising
  • a paper board which is coated with a water barrier coating on at least one of its uncoated surfaces having a smoothness of equal or less than 500 ml/min according to Bendtsen ISO 8791-2 or
  • a paper board which is coated on at least one of its uncoated surfaces with a first surface coating based on at least one mineral pigment and on at least one polymeric binder, preferably with polar groups, and which on top of the first surface coating having a smoothness of 100 ml/min or less according to
  • Bendtsen ISO 8791-2 is coated with a water barrier coating, wherein each of said water barrier coatings being based on at least one polymer having a melting point of at least 120 °C is applied in an amount of providing a COBB value of the water barrier coated paper board of equal or less 8 g/m 2 per 600 sec and a surface energy equal or greater 38 mJ/m 2 at 20 °C (test liquid:water) and 2) optionally a sealable coating covering at least partially in
  • the water barrier coating which sealable coating is based on at least one polymer, preferably with polar groups, having a melting point of at least 10 °C below the melting point of the polymer component of the water barrier coating.
  • So called fast food restaurants are a major and growing supplier of nutrition.
  • the logical concept of fast food restaurants is based on the single use package.
  • Single use means that after the consumption of the food, the package of the food is discarded.
  • Such packages may consist of both cellulosic material, predominantly in form of fibres, like paper, paper board or other molded fibre items, or plastic materials like polyethylene, polypropylene or polyethylenterephtalate or of a mixture of cellulosic material and plastic material, a waste management based on recycling the material could be difficult, even impossible.
  • this waste consists of a mixture of plastic material and cellulosic material typically. In order to recycle this waste, it is necessary to separate the different materials which could be recycled after separation from each other.
  • the residue of the repulped sheet material if any, is also preferably biodegradable and can be composted when disposed off in a landfill or otherwise dispose systems.
  • a paper board which is coated with a water barrier coating on at least one of its uncoated surfaces having a smoothness of equal or less than 500 ml/min according to Bendtsen ISO 8791-2 or
  • a paper board which is coated on at least one of its uncoated surfaces with a first surface coating based on 70 - 90 dried wt% of at least one mineral pigment and on 10 - 30 dried wt% of at least one polymeric binder, preferably with polar groups, and optionally 1 - 5 dried wt% of auxiliary agents, with the provision that all components are adding up to 100 dried wt%, and which on top of that first surface coating having a smoothness of 100ml/min or less according to Bendtsen, ISO 8791-2, is coated with a water barrier coating, wherein each of said water barrier coatings being based on at least one polymer having a melting point of at least 120 °C is applied in an amount of providing a COBB value of the water barrier coated paper board 1a), respectively 1b), of equal or less 8 g/m 2 per 600 sec and a surface energy equal or greater 38 mJ/m 2 at 20 °C (test liquid: water)
  • the water barrier coating which sealable coating is based on at least one polymer, preferably with polar groups, having a melting point of at least 10 °C below the melting point of the polymer component of the water barrier coating.
  • any container formed thereof according to standard paper mill processes the barrier coating of the sheet material must not interfere with these processes however must guarantee a sufficient high water and optionally grease barrier especially for any water containing foodstuff being provided in any container, especially any cup, produced from the inventive sheet material. Accordingly, none of the coatings of the paper board, respectively the containers, especially the cups produced thereof, contain or comprise any wax or wax component.
  • barrier material in an amount as low as possible but sufficient high to provide the necessary water barrier expressed in a COBB value of equal or less 8 g/m 2 per 600 sec and having a surface energy equal or greater 38 mJ/m 2 at 20 °C for guaranteeing the repulpability respectively recyclability according to standard paper mill processes by allowing an easy separation between the polymer component of the water barrier coating and any fiber material of the paper board.
  • this repulpability of the inventive sheet material is further improved by the fact that the necessary water barrier is already achieved with a barrier coating amounting only to 10 g/m 2 at maximum thereby preventing any fiber clouding during the repulping process. This amount decreases with increasing smoothness of the paper board surface to be coated with the water barrier coating at a given COBB value.
  • a smooth surface of the paper board being coated with the water barrier coating is a requirement for achieving the necessary water barrier with such a low amount of coating.
  • the inventive recyclable sheet material comprises a paper board as substrate sheet of which at least one of its uncoated surfaces has a smoothness of equal or less than 500 ml/min according to Bendtsen ISO 8791-2.
  • This smoothness allows achieving the necessary water barrier expressed as a COBB value of the water barrier coated paper board of equal or less 8 g/m 2 per 600 sec, preferably 1-5 g/m 2 per 600 sec.
  • the paper board 1 b)already coated on at least one of its uncoated surfaces with a first surface coating based on at least one mineral pigment and at least one polymeric binder which coated surface has a smoothness of 100ml/min or less according to Bendtsen ISO8791-2 can be coated with an even less amount of a water barrier coating, namely with an amount of as low as 3-9 g/m 2 , more preferably 4-6 g/m 2 , for achieving a COBB value of the water barrier coated paper board of equal or less 8 g/m 2 per 600 sec, preferably 1-5 g/m 2 per 600 sec.
  • the inventive recyclable sheet material comprises as substrate preferably a paper board having a grammage of 170-300 g/m 2 .
  • the paper board having a grammage of 170-300 g/m 2 can already have on at least one of its uncoated surfaces a first surface coating being based preferably on a dried water based dispersion consisting of at least one mineral pigment and at least one polymeric binder which polymeric binder has preferably polar groups, and optionally auxiliary agents for achieving a smoothness of 100 ml/min or less according to Bendtsen ISO 8791-2 of the coated surface.
  • this first surface coating of the paper board 1 b) comprises at least one mineral pigment and at least one polymeric binder preferably with polar groups.
  • the mineral pigment component is at least one mineral pigment selected from the group comprising clay, talc, calcium carbonate, titanium dioxide, kaolin or mixtures thereof, preferably clay or kaolin, most preferably clay.
  • the polymeric binder is at least one polymeric binder selected from the group comprising polyacrylates, acrylate copolymers, preferably acrylate/styrene copolymers, polyvinyl acetates, ethylene/vinyl acetate copolymers, styrene
  • copolymers preferably styrene/butadiene copolymers or styrene/butylacrylate copolymers, and mixtures thereof, most preferably acrylate copolymers.
  • these polymers are polymers having polar groups, preferably carboxylic groups, carboxylic ester groups, carboxylic amide groups and/or OH groups.
  • the first surface coating provides a surface energy equal or greater 38 mJ/ m 2 at 20°C (test liquid:water).
  • the first surface coating is applied preferably as water based dispersion on at least one uncoated surface of the paper board 1 b).
  • a water based dispersion used for this application may also contain the usual auxiliary agents like thickening agents, defoaming agents, dispersants, anti-block agents, anti-static agents and/or slipping agents.
  • auxiliary agents like thickening agents, defoaming agents, dispersants, anti-block agents, anti-static agents and/or slipping agents.
  • the amounts of all components of such first the dried surface coating are adding up to 100 dried wt%.
  • the same kind of water barrier coating can be applied to at least one uncoated surface of a paper board 1a), respectively on top of the first coating of the paper board 1 b).
  • Such water barrier coating is also applied preferably as a water based dispersion based on at least one polymer preferably with polar groups like carboxylic-, carboxylic ester-, carboxylic amide- and/or OH-groups and optionally usual auxiliaries.
  • the polymer component of the water based dispersion is at least one polymer selected from the group comprising acrylate polymers, acrylate copolymers, methacrylate polymers, methacrylate copolymers, styrene copolymers, preferably styrene/acrylate copolymers, ethylene/vinyl acetate copolymers and mixtures thereof.
  • the polymer component of the water based dispersion is at least one acrylate polymer, acrylate copolymer, methacrylate copolymer or a mixture of an acrylate polymer with a methacrylate polymer, most preferably an acrylate/styrene copolymer.
  • the water barrier coating is providing a surface energy of equal or greater 38 mJ/m 2 , more preferably from 38 to 55 mJ/m 2 at 20 °C (test liquid: water).
  • the water barrier coating is applied as a water based dispersion of the polymer component and optionally at least one auxiliary agent in an amount of 1-5 dried wt%.
  • auxiliary agents dispersants, thickening agents, defoaming agents, cross linking agents, anti-block agents, anti-static agents and/or slipping agents can be used.
  • the barrier coating is based on 95-99 dried wt% of the polymer component and 1-5 dried wt% of at least one auxiliary agent with the provision that all components are adding up to 100 dried wt%.
  • the polymer component of the water barrier coating should have a melting point of at least 120 °C unless the barrier coating also serves as sealable coating. In such case, if no sealable coating 2) is present and the barrier coating also functions as sealable material, the polymer component should have a melting point of equal or less 150 °C preferably from 120 to 148 °C.
  • the barrier coating does not function as a sealable material the barrier coating is covered by a sealable coating at least in designated areas.
  • the heat sealable coating is applied at least partially in the areas which have to be joined for the formation of a container formed of the inventive recyclable sheet material.
  • the sealable coating is based on at least one polymer, preferably with polar groups having a melting point of at least 10 °C below the melting point of the polymer component of the water barrier coating.
  • the sealable coating is based on a polymer component having a melting point of 120 °C or less.
  • the sealable coating is based on at least one polymer selected from the group comprising acrylate polymers, acrylate copolymers, methacrylate polymers, methacrylate copolymers, ethylene vinyl acetate copolymers, styrene copolymers, preferably styrene/acrylate copolymers and mixtures thereof, most preferable acrylate/styrene copolymers.
  • the polymer used for the sealable coating has polar groups like
  • carboxylic-, carboxylic ester-, carboxylic amide- and/or OH-groups providing a surface energy of equal or greater 38 mJ/m 2 , more preferably from 38 to 55 mJ/m 2 at 20 °C (test liquid: water).
  • the sealable coating can optionally contain auxiliary agents like thickening agents, defoaming agents, dispersants, cross-linking agents, anti-block agents, anti-static agents and/or slipping agents in an amount of 1-5 dried wt%, more preferably the sealable coating is based on 95-99 dried wt% of the polymer component and 1- 5 dried wt% of at least one auxiliary agent, with the provision that all components are adding up to 100 dried wt%.
  • auxiliary agents like thickening agents, defoaming agents, dispersants, cross-linking agents, anti-block agents, anti-static agents and/or slipping agents in an amount of 1-5 dried wt%, more preferably the sealable coating is based on 95-99 dried wt% of the polymer component and 1- 5 dried wt% of at least one auxiliary agent, with the provision that all components are adding up to 100 dried wt%.
  • the sealable coating is applied on a barrier coating in an amount 12 g/m 2 at maximum, more preferably in an amount of 6-10 g/m 2 . If appropriate for the formation of a container by using the inventive recyclable sheet material this amount can be split, preferably equally between the two preferably overlapping areas that have to be combined for the formation of a container, preferably a cup.
  • the polymer component of the barrier coating as well as of the sealable coating has preferably a glass transition temperature T g of 10 - 30 °C (measured according to DSC).
  • the sealable coating can also be applied as a water based dispersion which is dried after the coating like the first coating of paper board 1 b), respectively each of the water barrier coatings of paper board 1 a), respectively 1 b).
  • Each of the coatings namely the first surface coating, the water barrier coating and the sealable coating, can be applied according to known processes, whereby each of the coatings is dried and preferably cooled before the next coating is applied.
  • the application of the coatings can be carried out continuously by using equipment already known in the art, in-line or off-line the paper board production. Off-line coating is preferred in order to have the possibility for necessary variations of the coating compositions.
  • the recyclable sheet material can also be coated on both of the uncoated surfaces of the paper board with the same sequence of coatings as is applied to the first uncoated or coated surface of the paper board.
  • This sequence of coatings can also be manufactured by known processes, preferably by laminating and/or coating and/or extrusion of the respective coating.
  • Each coating can be applied on the paper board web, uncoated or already coated by means of blade coating, roll coating, rod coating, curtain coating or spraying.
  • a further object of the present invention is a container, preferably a cup, most preferably a cup for single use, which is formed of the inventive recyclable sheet material.
  • the heat sealable material of the recyclable sheet material is preferably activated by heat, preferably by hot air, and combined by pressing.
  • the surface of the recyclable sheet material which is at least partially coated with the heat sealing material is preferably the inner surface of the container wall.
  • the term "recyclable” means that the whole content of cellulosic material (paper board) of the inventive sheet material,
  • repulpable and the contents of the non-cellulosic material like any coatings are at least repulpable according to standard paper mill processes with standard process conditions without relying on any specially configured repulping equipment.
  • the amount of non-cellulosic material of the inventive sheet material, respectively of an inventive container, preferably cup, formed of the inventive sheet material is at most 15 wt% of the whole sheet material or container, preferably cup.
  • the non-cellulosic material of the inventive sheet material, respectively inventive container, preferably cup, built thereof which is at least repulpable according to the before described definition is water-dispersible or water-soluble, therefore preferably it can not only be repulped but also at least partially be recycled according to the standard paper manufacturing processes or be degraded biologically according to DIN EN 13432.
  • the COBB value is determined according to DIN EN 20535:1994.
  • the inventive containers preferably cups, can be produced according to known manufacturing processes.
  • the inventive containers are especially useful for providing hot or cold beverages, ice cream or other hot or cold liquids respectively food.
  • hot or cold liquids especially aqueous liquids or ice cream, is preferred.
  • inventive sheet material can also be used to produce other containers, especially for single use, than cups and optionally corresponding lids.
  • These products can be trays, packages for milk and juices, plates or folded cartons for frozen foodstuff. All these kinds of containers are especially suitable for single use.

Abstract

The present invention relates to a recyclable sheet material and a container, preferably cup, formed of such recyclable sheet material comprising 1a) a paper board coated with a water barrier coating on at least one of its uncoated surfaces having a smoothness of equal or less than 500 ml/min according to Bendtsen ISO 8791-2 or 1b) a paper board which is coated on at least one of its uncoated surfaces with a first surface coating comprising at least one mineral pigment and at least one polymeric binder, preferably with polar groups, said coated surface having a smoothness of 100 ml/min or less according to Bendtsen ISO 8791-2 and on top of said first surface coating a water barrier coating, wherein said water barrier coatings being based on at least one polymer having a melting point of at least 120 °C is applied in an amount of providing a COBB value of the water barrier coated paper board of equal or less 8 g/m2 per 600 sec and a surface energy equal or greater 38 mJ/m2 at 20 °C (test liquid:water) and 2) optionally a sealable coating based on at least on polymer with polar groups.

Description

A recyclable sheet material and a container thereof
The present invention relates to a recyclable, preferably repulpable sheet material as defined below and a container, preferably a cup, based essentially on cellulosic material for water containing foodstuff formed of such recyclable sheet material comprising
1a) a paper board which is coated with a water barrier coating on at least one of its uncoated surfaces having a smoothness of equal or less than 500 ml/min according to Bendtsen ISO 8791-2 or
1 b) a paper board which is coated on at least one of its uncoated surfaces with a first surface coating based on at least one mineral pigment and on at least one polymeric binder, preferably with polar groups, and which on top of the first surface coating having a smoothness of 100 ml/min or less according to
Bendtsen ISO 8791-2 is coated with a water barrier coating, wherein each of said water barrier coatings being based on at least one polymer having a melting point of at least 120 °C is applied in an amount of providing a COBB value of the water barrier coated paper board of equal or less 8 g/m2 per 600 sec and a surface energy equal or greater 38 mJ/m2 at 20 °C (test liquid:water) and 2) optionally a sealable coating covering at least partially in
designated areas the water barrier coating, which sealable coating is based on at least one polymer, preferably with polar groups, having a melting point of at least 10 °C below the melting point of the polymer component of the water barrier coating.
So called fast food restaurants are a major and growing supplier of nutrition.
Predominantly, the logical concept of fast food restaurants is based on the single use package. Single use means that after the consumption of the food, the package of the food is discarded.
Since such packages may consist of both cellulosic material, predominantly in form of fibres, like paper, paper board or other molded fibre items, or plastic materials like polyethylene, polypropylene or polyethylenterephtalate or of a mixture of cellulosic material and plastic material, a waste management based on recycling the material could be difficult, even impossible.
Although it is known that the big advantage of single use package is that the used package need not be taken back for cleaning and thus a lot of energy consumption, like for heating dishwater and/or drying of the cleaned single use packages, is avoided, besides maintaining high and reliable hygienic standards for public use, the main stream of single use packages is worldwide a big problem.
The problem is related to the nature of the waste stream of single use packages. As already mentioned, this waste consists of a mixture of plastic material and cellulosic material typically. In order to recycle this waste, it is necessary to separate the different materials which could be recycled after separation from each other.
However, the waste stream containing a mixture of these materials makes it often impossible to separate and recycle the different materials economically.
Traditionally, in the manufacture of paper and paper board, paraffin waxes and synthetic polymers as plastic material are used as moisture retardants, water repellents, oil repellents, stiffness strengtheners and release agents. Consequently, the waste of such paper and paper board of which single use packages traditionally are made, is not only difficult, but often impossible to be repulped and recycled in standard paper mill processes, because the polymers, in particular the waxes derived from petroleum, are not biodegradable in mill white waters (circulated process waters) and discharge effluents. Additionally, the residue of the waxes that can't be removed from the pulp fibers during the repulping and recycling process can cause severe problems due to buildups that occur on the screens and felts used during the process of forming and making the paper or paperboard sheet.
It is also known that such waxes resist biodegradation and composting when disposed off in landfills and other waste disposal systems. Consequently, paper and paper board coated or impregnated with traditional synthetic polymers and waxes are also difficult and often impossible to repulp and recycle owing to their resistance to separate from the fibres in the standard repulping processes resulting in significant fibre losses in efforts to repulp and thus recycle them. Moreover, such synthetic polymers are also not biodegradable and therefore resist composting.
It is known that such impregnated paper and/or paper board can only be repulped by using specialized repulping machinery that separates the pulp fibres from the laminated films and/or impregnation which is far more expensive in terms of operating costs and/or recycled pulp fibre yields. The action of separating the fibres from any impregnating synthetic and/or plastic material damages some fibres causing them to be selected out of the recycled pulp and to be lost for reuse. Additionally a separated plastic material waste carries some of the fibres out of the repulpate when its adherence to the fibres is not hindered by the repulping process. Likewise, not only synthetic material used as sheets for the manufacture of paper and paper board, but also coatings and impregnating products made from synthetic materials like waxes, can be repulped for recycling only in specially configured repulping equipment that removes and separates the waxes. However, these more intense physical and chemical requirements of these repulping processes coupled with a loss of fibres that become trapped in the wax cause the recyclable, repulpable fibre levels to fall far below those of the standard repulping processes. In addition, packages made from such products are not biodegradable and must be separated and deposited in separate landfill areas.
It is therefore an object of the present invention to provide a recyclable sheet material especially for a container formed thereof, preferably for single use, based on cellulosic material, preferably on a paper board, which can be repulped and recycled according to standard paper mill processes although having a sufficient high water barrier which allows the production of containers of various kinds especially useful for foodstuff containing water. In addition the residue of the repulped sheet material, if any, is also preferably biodegradable and can be composted when disposed off in a landfill or otherwise dispose systems. This object is solved by providing a recyclable and preferably repulpable sheet material comprising
1a) a paper board which is coated with a water barrier coating on at least one of its uncoated surfaces having a smoothness of equal or less than 500 ml/min according to Bendtsen ISO 8791-2 or
1 b) a paper board which is coated on at least one of its uncoated surfaces with a first surface coating based on 70 - 90 dried wt% of at least one mineral pigment and on 10 - 30 dried wt% of at least one polymeric binder, preferably with polar groups, and optionally 1 - 5 dried wt% of auxiliary agents, with the provision that all components are adding up to 100 dried wt%, and which on top of that first surface coating having a smoothness of 100ml/min or less according to Bendtsen, ISO 8791-2, is coated with a water barrier coating, wherein each of said water barrier coatings being based on at least one polymer having a melting point of at least 120 °C is applied in an amount of providing a COBB value of the water barrier coated paper board 1a), respectively 1b), of equal or less 8 g/m2 per 600 sec and a surface energy equal or greater 38 mJ/m2 at 20 °C (test liquid: water)
and 2) optionally, a sealable coating covering at least partially in
designated areas the water barrier coating, which sealable coating is based on at least one polymer, preferably with polar groups, having a melting point of at least 10 °C below the melting point of the polymer component of the water barrier coating.
In order to achieve the recyclability of the inventive sheet material respectively any container formed thereof according to standard paper mill processes the barrier coating of the sheet material must not interfere with these processes however must guarantee a sufficient high water and optionally grease barrier especially for any water containing foodstuff being provided in any container, especially any cup, produced from the inventive sheet material. Accordingly, none of the coatings of the paper board, respectively the containers, especially the cups produced thereof, contain or comprise any wax or wax component.
Additionally, this is also only achieved by using as barrier material in an amount as low as possible but sufficient high to provide the necessary water barrier expressed in a COBB value of equal or less 8 g/m2 per 600 sec and having a surface energy equal or greater 38 mJ/m2 at 20 °C for guaranteeing the repulpability respectively recyclability according to standard paper mill processes by allowing an easy separation between the polymer component of the water barrier coating and any fiber material of the paper board.
Moreover, this repulpability of the inventive sheet material is further improved by the fact that the necessary water barrier is already achieved with a barrier coating amounting only to 10 g/m2 at maximum thereby preventing any fiber clouding during the repulping process. This amount decreases with increasing smoothness of the paper board surface to be coated with the water barrier coating at a given COBB value.
Thus, a smooth surface of the paper board being coated with the water barrier coating is a requirement for achieving the necessary water barrier with such a low amount of coating.
Accordingly the inventive recyclable sheet material comprises a paper board as substrate sheet of which at least one of its uncoated surfaces has a smoothness of equal or less than 500 ml/min according to Bendtsen ISO 8791-2. This smoothness allows achieving the necessary water barrier expressed as a COBB value of the water barrier coated paper board of equal or less 8 g/m2 per 600 sec, preferably 1-5 g/m2 per 600 sec.
Alternatively the paper board 1 b)already coated on at least one of its uncoated surfaces with a first surface coating based on at least one mineral pigment and at least one polymeric binder which coated surface has a smoothness of 100ml/min or less according to Bendtsen ISO8791-2, can be coated with an even less amount of a water barrier coating, namely with an amount of as low as 3-9 g/m2, more preferably 4-6 g/m2, for achieving a COBB value of the water barrier coated paper board of equal or less 8 g/m2 per 600 sec, preferably 1-5 g/m2 per 600 sec.
The inventive recyclable sheet material comprises as substrate preferably a paper board having a grammage of 170-300 g/m2. The paper board having a grammage of 170-300 g/m2 can already have on at least one of its uncoated surfaces a first surface coating being based preferably on a dried water based dispersion consisting of at least one mineral pigment and at least one polymeric binder which polymeric binder has preferably polar groups, and optionally auxiliary agents for achieving a smoothness of 100 ml/min or less according to Bendtsen ISO 8791-2 of the coated surface.
Preferably, this first surface coating of the paper board 1 b) comprises at least one mineral pigment and at least one polymeric binder preferably with polar groups. The mineral pigment component is at least one mineral pigment selected from the group comprising clay, talc, calcium carbonate, titanium dioxide, kaolin or mixtures thereof, preferably clay or kaolin, most preferably clay.
Preferably, the polymeric binder is at least one polymeric binder selected from the group comprising polyacrylates, acrylate copolymers, preferably acrylate/styrene copolymers, polyvinyl acetates, ethylene/vinyl acetate copolymers, styrene
copolymers, preferably styrene/butadiene copolymers or styrene/butylacrylate copolymers, and mixtures thereof, most preferably acrylate copolymers.
Preferably these polymers are polymers having polar groups, preferably carboxylic groups, carboxylic ester groups, carboxylic amide groups and/or OH groups.
The first surface coating provides a surface energy equal or greater 38 mJ/ m2 at 20°C (test liquid:water). In order to achieve this surface energy and to provide a smooth surface of the paper board 1 b) the first surface coating is applied preferably as water based dispersion on at least one uncoated surface of the paper board 1 b). Thereby, after drying a first coating based on 70-90, preferably 75 - 85, dried wt% of at least one mineral pigment and 10-30, preferably 15 - 25, dried wt% of at least one polymeric binder is achieved.
For a person skilled in the art it is obvious that a water based dispersion used for this application may also contain the usual auxiliary agents like thickening agents, defoaming agents, dispersants, anti-block agents, anti-static agents and/or slipping agents. The amounts of all components of such first the dried surface coating are adding up to 100 dried wt%.
According to the present invention, the same kind of water barrier coating can be applied to at least one uncoated surface of a paper board 1a), respectively on top of the first coating of the paper board 1 b).
Such water barrier coating is also applied preferably as a water based dispersion based on at least one polymer preferably with polar groups like carboxylic-, carboxylic ester-, carboxylic amide- and/or OH-groups and optionally usual auxiliaries. Preferably the polymer component of the water based dispersion is at least one polymer selected from the group comprising acrylate polymers, acrylate copolymers, methacrylate polymers, methacrylate copolymers, styrene copolymers, preferably styrene/acrylate copolymers, ethylene/vinyl acetate copolymers and mixtures thereof.
Preferably, the polymer component of the water based dispersion is at least one acrylate polymer, acrylate copolymer, methacrylate copolymer or a mixture of an acrylate polymer with a methacrylate polymer, most preferably an acrylate/styrene copolymer.
Preferably, the water barrier coating is providing a surface energy of equal or greater 38 mJ/m2, more preferably from 38 to 55 mJ/m2 at 20 °C (test liquid: water).
Preferably, the water barrier coating is applied as a water based dispersion of the polymer component and optionally at least one auxiliary agent in an amount of 1-5 dried wt%. As auxiliary agents dispersants, thickening agents, defoaming agents, cross linking agents, anti-block agents, anti-static agents and/or slipping agents can be used. Most preferably the barrier coating is based on 95-99 dried wt% of the polymer component and 1-5 dried wt% of at least one auxiliary agent with the provision that all components are adding up to 100 dried wt%.
The polymer component of the water barrier coating should have a melting point of at least 120 °C unless the barrier coating also serves as sealable coating. In such case, if no sealable coating 2) is present and the barrier coating also functions as sealable material, the polymer component should have a melting point of equal or less 150 °C preferably from 120 to 148 °C.
In case the water barrier coating does not function as a sealable material the barrier coating is covered by a sealable coating at least in designated areas. Preferably, the heat sealable coating is applied at least partially in the areas which have to be joined for the formation of a container formed of the inventive recyclable sheet material. The sealable coating is based on at least one polymer, preferably with polar groups having a melting point of at least 10 °C below the melting point of the polymer component of the water barrier coating. Preferably, the sealable coating is based on a polymer component having a melting point of 120 °C or less.
Preferably, the sealable coating is based on at least one polymer selected from the group comprising acrylate polymers, acrylate copolymers, methacrylate polymers, methacrylate copolymers, ethylene vinyl acetate copolymers, styrene copolymers, preferably styrene/acrylate copolymers and mixtures thereof, most preferable acrylate/styrene copolymers.
Preferably, the polymer used for the sealable coating has polar groups like
carboxylic-, carboxylic ester-, carboxylic amide- and/or OH-groups providing a surface energy of equal or greater 38 mJ/m2, more preferably from 38 to 55 mJ/m2 at 20 °C (test liquid: water).
Besides the polymer component the sealable coating can optionally contain auxiliary agents like thickening agents, defoaming agents, dispersants, cross-linking agents, anti-block agents, anti-static agents and/or slipping agents in an amount of 1-5 dried wt%, more preferably the sealable coating is based on 95-99 dried wt% of the polymer component and 1- 5 dried wt% of at least one auxiliary agent, with the provision that all components are adding up to 100 dried wt%.
Preferably the sealable coating is applied on a barrier coating in an amount 12 g/m2 at maximum, more preferably in an amount of 6-10 g/m2. If appropriate for the formation of a container by using the inventive recyclable sheet material this amount can be split, preferably equally between the two preferably overlapping areas that have to be combined for the formation of a container, preferably a cup.
The polymer component of the barrier coating as well as of the sealable coating has preferably a glass transition temperature Tg of 10 - 30 °C (measured according to DSC).
The sealable coating can also be applied as a water based dispersion which is dried after the coating like the first coating of paper board 1 b), respectively each of the water barrier coatings of paper board 1 a), respectively 1 b).
Each of the coatings, namely the first surface coating, the water barrier coating and the sealable coating, can be applied according to known processes, whereby each of the coatings is dried and preferably cooled before the next coating is applied. The application of the coatings can be carried out continuously by using equipment already known in the art, in-line or off-line the paper board production. Off-line coating is preferred in order to have the possibility for necessary variations of the coating compositions.
Moreover the recyclable sheet material can also be coated on both of the uncoated surfaces of the paper board with the same sequence of coatings as is applied to the first uncoated or coated surface of the paper board. This sequence of coatings can also be manufactured by known processes, preferably by laminating and/or coating and/or extrusion of the respective coating. Each coating can be applied on the paper board web, uncoated or already coated by means of blade coating, roll coating, rod coating, curtain coating or spraying. A further object of the present invention is a container, preferably a cup, most preferably a cup for single use, which is formed of the inventive recyclable sheet material.
In order to form the inventive container, the heat sealable material of the recyclable sheet material, is preferably activated by heat, preferably by hot air, and combined by pressing. The surface of the recyclable sheet material which is at least partially coated with the heat sealing material is preferably the inner surface of the container wall.
According to the present invention the term "recyclable" means that the whole content of cellulosic material (paper board) of the inventive sheet material,
respectively inventive container, preferably cup, is recyclable which means
repulpable and the contents of the non-cellulosic material like any coatings are at least repulpable according to standard paper mill processes with standard process conditions without relying on any specially configured repulping equipment.
The amount of non-cellulosic material of the inventive sheet material, respectively of an inventive container, preferably cup, formed of the inventive sheet material is at most 15 wt% of the whole sheet material or container, preferably cup.
The non-cellulosic material of the inventive sheet material, respectively inventive container, preferably cup, built thereof which is at least repulpable according to the before described definition is water-dispersible or water-soluble, therefore preferably it can not only be repulped but also at least partially be recycled according to the standard paper manufacturing processes or be degraded biologically according to DIN EN 13432.
The COBB value is determined according to DIN EN 20535:1994.
The inventive containers, preferably cups, can be produced according to known manufacturing processes.
The inventive containers, preferably cups, are especially useful for providing hot or cold beverages, ice cream or other hot or cold liquids respectively food. The provision of hot or cold liquids, especially aqueous liquids or ice cream, is preferred.
Additionally, it is evident that the inventive sheet material can also be used to produce other containers, especially for single use, than cups and optionally corresponding lids. These products can be trays, packages for milk and juices, plates or folded cartons for frozen foodstuff. All these kinds of containers are especially suitable for single use.

Claims

1. A recyclable sheet material comprising
1a) a paper board which is coated with a water barrier coating on at least one of its uncoated surfaces having a smoothness of equal or less than 500ml/min according to Bendtsen, ISO 8791-2 or
1 b) a paper board which is coated on at least one of its uncoated surfaces with a first surface coating based on 70 - 90 dried wt% of at least one mineral pigment and on 10 - 30 dried wt% of at least one polymeric binder, preferably with polar groups, and optionally 1 - 5 dried wt% of auxiliary agents, with the provision that all components are adding up to 100 dried wt%, and which on top of that first surface coating having a smoothness of 100ml/min or less according to Bendtsen, ISO 8791-2, is coated with a water barrier coating, wherein each of said water barrier coatings being based on at least one polymer having a melting point of at least 120°C is applied in an amount of providing a COBB value of the water barrier coated paper board 1a) respectively 1 b) of equal or less 8g/m2 per 600 sec and a surface energy equal or greater
38 mJ/ m2 at 20°C (test liquid: water), and optionally a sealable coating covering at least partially in designated areas of each of said water barrier coatings, which sealable coating is based on at least one polymer, preferably with polar groups, having a melting point of at least 10°C below the melting point of the polymer component of the water barrier coating.
2. A recyclable sheet material according to claim 1 , wherein the water barrier coating amounts to 10 g/m2 at maximum, which amount decreases with increasing smoothness of the paper board surface coated with the water barrier coating at a given COBB value.
3. A recyclable sheet material according to claim 1 or 2, wherein the first surface coating of the paper board 1 b) is based on at least a mineral pigment selected from the group comprising clay, talc, calcium carbonate, titanium dioxide, kaolin and mixtures thereof, and a polymeric binder.
4. A recyclable sheet material as claimed in any one of claims 1 - 3, wherein the polymeric binder of the first surface coating of the paper board 1 b) is based on at least one polymer selected from the group comprising polyacrylates, acrylate copolymers, acrylate/styrene copolymers, polyvinyl acetates, ethylene/vinyl acetate copolymers, styrene copolymers, preferably
styrene/butadiene copolymers or styrene/butylacrylate copolymers, and mixtures thereof.
5. A recyclable sheet material as claimed in any one of claims 1 - 4, wherein the first surface coating of the paper board 1 b) is based on a dried water-based dispersion comprising 75 - 85 dried wt% of at least one mineral pigment and 15 - 25 dried wt% of at least one polymeric binder and optionally 1 - 5 dried wt% of usual auxiliary agents, with the provision that all components are adding up to 100 dried wt%.
6. A recyclable sheet material as claimed in any one of claims 1 - 5, wherein the water barrier coating is based on at least one polymer selected from the group comprising acrylate polymers, acrylate copolymers, methacrylate polymers, methacrylate copolymers, styrene copolymers, preferably styrene/butylacrylate copolymers, ethylene/vinyl acetate copolymers and mixtures thereof, said water barrier coating having a surface energy equal or greater 38 mJ/m2 at 20°C (test liquid:water).
7. A recyclable sheet material as claimed in any one of claims 1 - 6, wherein the water barrier coating is based on 95 - 99 dried wt% of the polymer component and 1- 5 dried wt% of auxiliary agents, based on the total weight of the dried coating.
8. A recyclable sheet material as claimed in any one of claims 1 - 7, wherein the water barrier coating provides a COBB value of 1 - 5 g/m2 per 600 seconds of the coated paper board 1a), respectively 1b).
9. A recyclable sheet material as claimed in any one of claims 1 - 8, wherein the sealable coating is based on at least one polymer selected from the group comprising acrylate polymers, acrylate copolymers, methacrylate polymers, methacrylate copolymers, styrene copolymers, preferably styrene/acrylate copolymers, ethylene/vinyl acetate copolymers and mixtures thereof.
10. A recyclable sheet material as claimed in any one of claims 1 - 9, wherein said sealable coating is coated on the water barrier coating in an amount of 12 g/m2 at maximum at the designated areas of the water barrier coating.
11.A recyclable sheet material as claimed in any one of claims 1 - 10, wherein the sealable coating is based on 95 - 99 dried wt% of the polymer component and 1 - 5 dried wt% of auxiliary agents.
12. A recyclable sheet material as claimed in any one of claims 1 - 11 , wherein the polymer component of the water barrier coating and preferably of the sealable coating has a glass transition temperature Tg of 10° - 30°C
(measured according to DSC).
13. A recyclable sheet material as claimed in any one of claims 1 - 11 , wherein the water barrier coating also functions as sealable coating having a melting point equal or less than 150 °C.
14. A recyclable sheet as claimed in anyone of claims 1 - 13, wherein the second surface of the paper board is provided with the same sequence of coatings as the first surface of the paper board 1a), respectively 1 b).
15. A recyclable sheet as claimed in any one of claims 1 - 14, wherein the amount of non-cellulosic material is at most 15 wt% of the whole sheet material.
16. A container, preferably a cup, formed of a recyclable sheet material as claimed in any one of claim 1 - 15, wherein the water barrier coated surface is arranged as inwardly directed surface of the container, preferably cup.
17. A container, preferably a cup, as claimed in claim 16, for hot or cold
beverages, ice cream or other hot or cold liquids respectively food.
18. A container, preferably a cup, as claimed in claim 16 or 17 for single use.
PCT/EP2013/001932 2012-07-03 2013-07-02 A recyclable sheet material and a container thereof WO2014005697A2 (en)

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016016340A1 (en) 2014-07-30 2016-02-04 Munksjö Oyj Heat-sealing barrier paper
WO2016170229A1 (en) * 2015-04-20 2016-10-27 Kotkamills Group Oyj Method and system for manufacturing a coated paperboard and a coated paperboard
WO2018031387A1 (en) * 2016-08-08 2018-02-15 Westrock Mwv, Llc Compostable paperboard with oil, grease, and moisture resistance
CN108035183A (en) * 2016-08-30 2018-05-15 周杰 Intensity and the preferable toiler roll of water absorbing properties, production method
WO2018116118A1 (en) * 2016-12-22 2018-06-28 Stora Enso Oyj Method for manufacturing a packaging material and a packaging material made by the method
WO2018229344A1 (en) * 2017-06-15 2018-12-20 Kemira Oyj Coating structure, sheet-like product and its use
US10253458B2 (en) 2015-02-11 2019-04-09 Westrock Mwv, Llc Printable compostable paperboard
WO2019130179A1 (en) * 2017-12-28 2019-07-04 Stora Enso Oyj A paperboard for packaging of liquid and/or frozen food
WO2019160706A1 (en) * 2018-02-19 2019-08-22 Westrock Mwv, Llc Paperboard structure with at least one barrier coating layer
EP3186441B1 (en) 2014-07-30 2019-12-25 Ahlstrom-Munksjö OYJ Method for the production of heat-sealing barrier paper
SE2050575A1 (en) * 2020-05-18 2021-11-19 Stora Enso Oyj A process for producing a packaging material
US11377251B2 (en) 2018-04-27 2022-07-05 Westrock Mwv, Llc Heat-sealable paperboard structures and associated paperboard-based containers
WO2022268856A1 (en) * 2021-06-23 2022-12-29 Gruppo Cordenons S.P.A. Paper material for fluid containers having characteristics of calibrated fragility and rigidity and a barrier property
US11578462B2 (en) 2018-04-27 2023-02-14 Westrock Mwv, Llc Anti-blocking high barrier paperboard structures
US11718059B2 (en) 2017-11-30 2023-08-08 Dart Container Corporation Process for forming a paper container and related methods and materials
US11767639B2 (en) 2019-01-17 2023-09-26 Westrock Mwv, Llc Coated paperboard containers having an aqueous barrier coating

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9732474B2 (en) 2015-05-29 2017-08-15 International Paper Company Hydrophobic coated paper substrate for polymer emulsion topcoats and method for making same
US10583977B2 (en) 2016-08-16 2020-03-10 Mp Global Products, L.L.C. Method of making an insulation material and an insulated mailer
CA3051458A1 (en) 2017-02-27 2018-08-30 Westrock Mwv, Llc Heat sealable barrier paperboard
US10442600B2 (en) * 2017-04-07 2019-10-15 Pratt Retail Specialties, Llc Insulated bag
US10800595B2 (en) 2017-04-07 2020-10-13 Pratt Retail Specialties, Llc Box liner
EP3615730A4 (en) 2017-04-28 2021-01-27 Sun Chemical Corporation Heat sealable barrier coating
US10954057B2 (en) 2017-05-09 2021-03-23 Pratt Retail Specialties, Llc Insulated box
US10604304B2 (en) 2017-05-09 2020-03-31 Pratt Retail Specialties, Llc Insulated bag with handles
US10551110B2 (en) 2017-07-31 2020-02-04 Pratt Retail Specialties, Llc Modular box assembly
EP3710634B1 (en) 2017-11-13 2023-05-03 Sun Chemical Corporation Water-based coatings for cellulosic substrates
EP3710547A4 (en) * 2017-11-17 2021-09-22 Imerys USA, Inc. Heat-seal coatings
US10507968B2 (en) 2017-12-18 2019-12-17 Pratt Retail Specialties, Llc Modular box assembly
US10947025B2 (en) 2017-12-18 2021-03-16 Pratt Corrugated Holdings, Inc. Insulated block packaging assembly
BR112020021184A2 (en) 2018-04-30 2021-01-19 Westrock Mwv, Llc COATED CARDBOARD CONTAINER, METHOD OF MANUFACTURING COATED CARDBOARD CONTAINER AND CUP BACKGROUND FORMATING APPLIANCE
US11059652B2 (en) 2018-05-24 2021-07-13 Pratt Corrugated Holdings, Inc. Liner
US11066228B2 (en) 2018-11-13 2021-07-20 Pratt Retail Specialties, Llc Insulated box assembly and temperature-regulating lid therefor
US10875678B2 (en) 2018-11-13 2020-12-29 Pratt Retail Specialties, Llc Box insert with vertical rails
US10882684B2 (en) 2019-05-02 2021-01-05 Pratt Retail Specialties, Llc Box defining walls with insulation cavities
US11230404B2 (en) 2019-11-26 2022-01-25 Pratt Corrugated Holdings, Inc. Perforated collapsible box
US20210276314A1 (en) * 2020-03-04 2021-09-09 Westrock Mwv, Llc Coffee stain-resistant cellulosic structures and associated containers and methods
US11718464B2 (en) 2020-05-05 2023-08-08 Pratt Retail Specialties, Llc Hinged wrap insulated container
USD968950S1 (en) 2020-08-10 2022-11-08 Pratt Corrugated Holdings, Inc. Perforated collapsible box
CA3211618A1 (en) * 2021-03-10 2022-09-15 Norm TOMLINSON Water resistant and repulpable compositions
CA3217188A1 (en) * 2021-05-10 2022-11-17 Jiebin Pang Coated paperboard containers and methods

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5981011A (en) * 1992-01-22 1999-11-09 A*Ware Technologies, L.C. Coated sheet material
US5425972A (en) * 1993-04-16 1995-06-20 Westvaco Corporation Heat sealed, ovenable food carton lids
US5989724A (en) * 1993-05-10 1999-11-23 International Paper Company Recyclable and repulpable ream wrap and related methods of manufacture
GB2301844A (en) * 1995-06-05 1996-12-18 Rexam Coated Products Limited A recording sheet
US6740373B1 (en) * 1997-02-26 2004-05-25 Fort James Corporation Coated paperboards and paperboard containers having improved tactile and bulk insulation properties
CA2327294A1 (en) * 1998-04-07 1999-10-14 Seydel Research, Inc. Water dispersible/redispersible hydrophobic polyester resins and their application in coatings
GB9823499D0 (en) * 1998-10-27 1998-12-23 Proman Chem Ltd Barrier coatings
FR2860808B1 (en) * 2003-10-14 2006-02-17 Ahlstrom Research & Services BARRIER PAPER WITH WATER VAPOR
US7358325B2 (en) * 2004-07-09 2008-04-15 E. I. Du Pont De Nemours And Company Sulfonated aromatic copolyesters containing hydroxyalkanoic acid groups and shaped articles produced therefrom
US7404999B2 (en) * 2004-09-30 2008-07-29 Graphic Packaging International, Inc. Anti-blocking barrier composite
US20070042146A1 (en) * 2005-08-19 2007-02-22 Exopack-Technology, Llc Grease-resistant bag and related methods
SE532388C2 (en) * 2008-03-14 2010-01-12 Tetra Laval Holdings & Finance Packaging laminates and containers with two separate gas barrier layers and method for their preparation
WO2012061704A1 (en) * 2010-11-05 2012-05-10 International Paper Company Packaging material having moisture barrier and methods for preparing same

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None
See also references of EP2870288A2

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016016340A1 (en) 2014-07-30 2016-02-04 Munksjö Oyj Heat-sealing barrier paper
EP3186441B1 (en) 2014-07-30 2019-12-25 Ahlstrom-Munksjö OYJ Method for the production of heat-sealing barrier paper
US10253458B2 (en) 2015-02-11 2019-04-09 Westrock Mwv, Llc Printable compostable paperboard
US10519604B2 (en) 2015-02-11 2019-12-31 Westrock Mwv, Llc Oil and grease resistant paperboard
EP3286378B1 (en) 2015-04-20 2019-04-10 Kotkamills Group Oyj Method and system for manufacturing a coated paperboard and a coated paperboard
US11220788B2 (en) 2015-04-20 2022-01-11 Kotkamills Group Oyj Method and system for manufacturing a coated paperboard and a coated paperboard
WO2016170229A1 (en) * 2015-04-20 2016-10-27 Kotkamills Group Oyj Method and system for manufacturing a coated paperboard and a coated paperboard
CN109790686B (en) * 2016-08-08 2022-03-15 维实洛克Mwv有限责任公司 Compostable paperboard with oil, grease and moisture resistance
CN109790686A (en) * 2016-08-08 2019-05-21 维实洛克Mwv有限责任公司 Compost cardboard with oil resistant, grease resistance and moisture-proof
WO2018031387A1 (en) * 2016-08-08 2018-02-15 Westrock Mwv, Llc Compostable paperboard with oil, grease, and moisture resistance
CN108035183A (en) * 2016-08-30 2018-05-15 周杰 Intensity and the preferable toiler roll of water absorbing properties, production method
WO2018116118A1 (en) * 2016-12-22 2018-06-28 Stora Enso Oyj Method for manufacturing a packaging material and a packaging material made by the method
US11098452B2 (en) 2016-12-22 2021-08-24 Stora Enso Oyj Method for manufacturing a packaging material and a packaging material made by the method
CN110100059A (en) * 2016-12-22 2019-08-06 斯道拉恩索公司 The packaging material for manufacturing the method for packaging material and being manufactured by the method
RU2753930C2 (en) * 2016-12-22 2021-08-24 Стора Энсо Ойй Method for producing packaging material and packaging material produced with this method
US11242654B2 (en) 2017-06-15 2022-02-08 Kemira Oyj Coating structure, sheet-like product and its use
WO2018229344A1 (en) * 2017-06-15 2018-12-20 Kemira Oyj Coating structure, sheet-like product and its use
RU2752400C2 (en) * 2017-06-15 2021-07-27 Кемира Ойй Coating structure, sheet-like product and its application
US11718059B2 (en) 2017-11-30 2023-08-08 Dart Container Corporation Process for forming a paper container and related methods and materials
US11486095B2 (en) 2017-12-28 2022-11-01 Stora Enso Oyj Paperboard for packaging of liquid and/or frozen food
WO2019130179A1 (en) * 2017-12-28 2019-07-04 Stora Enso Oyj A paperboard for packaging of liquid and/or frozen food
WO2019160706A1 (en) * 2018-02-19 2019-08-22 Westrock Mwv, Llc Paperboard structure with at least one barrier coating layer
US11299855B2 (en) 2018-02-19 2022-04-12 Westrock Mwv, Llc Paperboard structure with at least one barrier coating layer
CN112055769A (en) * 2018-02-19 2020-12-08 维实洛克Mwv有限责任公司 Paperboard structure with at least one barrier coating layer
US11377251B2 (en) 2018-04-27 2022-07-05 Westrock Mwv, Llc Heat-sealable paperboard structures and associated paperboard-based containers
US11578462B2 (en) 2018-04-27 2023-02-14 Westrock Mwv, Llc Anti-blocking high barrier paperboard structures
US11787592B2 (en) 2018-04-27 2023-10-17 Westrock Mwv, Llc Heat-sealable paperboard structures and associated paperboard-based containers
US11767639B2 (en) 2019-01-17 2023-09-26 Westrock Mwv, Llc Coated paperboard containers having an aqueous barrier coating
WO2021234558A1 (en) * 2020-05-18 2021-11-25 Stora Enso Oyj A process for producing a packaging material
SE2050575A1 (en) * 2020-05-18 2021-11-19 Stora Enso Oyj A process for producing a packaging material
WO2022268856A1 (en) * 2021-06-23 2022-12-29 Gruppo Cordenons S.P.A. Paper material for fluid containers having characteristics of calibrated fragility and rigidity and a barrier property

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US20150111011A1 (en) 2015-04-23

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