WO2023229845A1 - Papier fonctionnel multicouche - Google Patents

Papier fonctionnel multicouche Download PDF

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Publication number
WO2023229845A1
WO2023229845A1 PCT/US2023/021690 US2023021690W WO2023229845A1 WO 2023229845 A1 WO2023229845 A1 WO 2023229845A1 US 2023021690 W US2023021690 W US 2023021690W WO 2023229845 A1 WO2023229845 A1 WO 2023229845A1
Authority
WO
WIPO (PCT)
Prior art keywords
paper
barrier
layer
packaging structure
oxygen barrier
Prior art date
Application number
PCT/US2023/021690
Other languages
English (en)
Inventor
Scott William Huffer
Mary Kate MIRMOW
Original Assignee
Sonoco Development, Inc.
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 Sonoco Development, Inc. filed Critical Sonoco Development, Inc.
Publication of WO2023229845A1 publication Critical patent/WO2023229845A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/42—Applications of coated or impregnated materials
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • 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
    • D21H19/02—Metal coatings
    • D21H19/08—Metal coatings applied as vapour, e.g. in vacuum
    • 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
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • 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
    • 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
    • B65D2565/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D2565/38—Packaging materials of special type or form
    • B65D2565/381—Details of packaging materials of special type or form
    • B65D2565/382—Details of packaging materials of special type or form made of special paper
    • 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
    • B65D2565/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D2565/38—Packaging materials of special type or form
    • B65D2565/381—Details of packaging materials of special type or form
    • B65D2565/387—Materials used as gas barriers

Definitions

  • Embodiments of the present invention relate generally to paper products, and more particularly, paper products with effective moisture and oxygen barrier properties.
  • Flexible packaging structures are generally made from multiple polymeric components, often comprising layers of different polymeric films laminated together to achieve desired properties.
  • the layered, laminated films provide desired barrier properties, however, are generally not recyclable in a standard recycling stream due to the multiple different polymers contained therein.
  • Paper products are being developed as an alternative to plastic packaging, however paper is a porous material, and thus lacks the barrier properties exhibited by plastic flexible packaging. There is a need to further improve the barrier properties for maintaining the safety and quality of packaged foods, while being recyclable in the standard recycling stream.
  • the invention comprises a paper packaging structure that delivers barrier properties comparable to a laminate film.
  • the present invention comprises a paper layer and a barrier layer applied to the paper layer.
  • the invention comprises a method of forming the multilayer functional paper from the modified paper layer, and barrier materials.
  • a paper packaging structure comprises a paper structure having an inner surface and an outer surface.
  • the paper packaging structure further comprises a barrier layer disposed adjacent the inner surface of the paper structure.
  • the barrier layer comprises a water-based oxygen barrier and a solvent-based sealant layer.
  • the oxygen barrier is positioned adjacent the inner surface of the paper structure.
  • the inner surface of the paper structure may be surface treated.
  • the paper structure may comprise metalized paper.
  • the paper structure may comprise a topcoat applied to the metalized surface of the paper structure.
  • the paper structure may comprise a metal layer.
  • the paper structure may comprise a topcoat applied to the metal layer.
  • the topcoat may be configured to facilitate a bond between the paper structure and the barrier layer.
  • the metal layer may be a primer layer.
  • the sealant layer may be a heat seal coating.
  • the oxygen barrier may be a PVA solution.
  • the PVA solution may be crosslinked.
  • the barrier layer may be a uniform thickness.
  • the sealant layer may be a cold seal coating.
  • the paper packaging structure may further comprise a moisture barrier.
  • a method for making a paper structure comprises applying a surface treatment to a paper structure.
  • the method further comprises coating a water-based oxygen onto the surface treated surface of the paper structure.
  • the method further comprises at least partially drying the water-based oxygen barrier and coating a solvent-based sealant layer onto the water-based oxygen barrier.
  • the paper structure may comprise a moisture barrier.
  • the paper structure may be metalized and form a metalized surface.
  • the method may further comprise applying a topcoat to the metalized surface of the paper structure.
  • the method may additionally comprise applying a primer to the paper structure.
  • the surface treatment may be a corona treatment.
  • the oxygen barrier may be applied to the paper structure at a ratio of between 0.25-1 pound per ream.
  • the oxygen barrier may be applied to the paper structure at a ratio between 0.5-0.7 pounds per ream.
  • the sealant layer may be applied at a weight ration between 1 -4 pounds per ream.
  • the sealant layer may be applied at a weight ratio between 2-3 pounds per ream.
  • a package comprising a paper packaging structure comprising a paper structure having an inner surface and an outer surface.
  • a barrier layer is disposed adjacent the inner surface of the paper structure.
  • the barrier layer comprises a water-based oxygen barrier and a solventbased sealant layer.
  • the oxygen barrier is positioned adjacent the inner surface of the paper structure.
  • the paper packaging structure is sealed about a product to form a package.
  • FIG. 1 illustrates a cross-sectional view of an example paper packaging structure, in accordance with some embodiments discussed herein;
  • FIG. 2 illustrates a process diagram for forming an example paper packaging structure, in accordance with some embodiments discussed herein.
  • Paper packaging products may require added barrier properties to preserve the condition of the contents of the packaging, as paper is porous and transmits oxygen and moisture easily.
  • FIG. 1 illustrates an example paper packaging structure 100.
  • the paper packaging structure may comprise a paper structure 110, and a barrier layer 130.
  • a surface treatment 120 may be utilized to promote adhesion between the paper structure 1 10 and the barrier layer 130.
  • the paper structure 110 may define at least one paper layer 1 15.
  • the paper structure 110 may comprise a plurality of paper layers 1 15.
  • the paper layer 115 may be a modified metalized paper.
  • the paper layer 1 15 may comprise only virgin paper, while in other embodiments, the paper layer 1 15 may comprise only recycled paper (post-consumer or post-industrial).
  • the paper layer 1 15 may comprise a combination of recycled paper and virgin paper.
  • the paper layer 115 may be a densified paper.
  • the paper layer 1 15 may have a density between 30-100 g/m 2 , between 40-80 g/m 2 , or 50-70 g/m 2 .
  • the density of the paper may contribute to barrier properties, as the paper layer 1 15 may exhibit less porosity at higher densities as the cellulous fibers are closer together.
  • the paper layer 1 15 may be treated to improve the smoothness of the paper layer 115 to ensure even coatings and layers, thereby improving the barrier properties of the paper layer 115.
  • a primer layer 1 17 may be applied to an inner surface 115b (with respect to a packaging structure that may be formed) of the paper layer 115.
  • the primer layer 1 17 may smooth the inner surface 115b of the paper layer 115.
  • the primer layer 1 17 may comprise inert clay particles configured to fill voids between the paper fibers of the paper layer 1 15.
  • the primer layer 117 may be used to change the porosity of the paper layer 115 by densifying the paper and smoothing the surface.
  • the primer layer 1 17 may provide an even surface for metallization.
  • the primer 115 may comprise a coating.
  • a metalized layer 1 11 may be applied directly to the paper layer 1 15 or to the primer layer 1 17.
  • the metalized layer 1 11 may be vacuum deposited.
  • a barrier coating e.g., AIOx, or SiOx
  • the metalized layer 1 11 may be substituted with a coating, film, or any other application known in the art.
  • a topcoat 113 may be applied to the metalized layer 1 11 opposite the primer layer 1 17.
  • the topcoat 113 may be a protective layer configured to increase flexibility and serve as a protective surface to keep the metalized layer 1 1 1 from being compromised.
  • the topcoat 1 13 may decrease cracking or voids in the metalized layer 1 11 , and general wear and tear from handling.
  • the topcoat 1 13 may prevent other degradation, and in some embodiments may prevent oxidation to the metalized layer 111.
  • the topcoat 1 13 may be a coating.
  • the paper structure 110 may define a first surface 1 10a and a second surface 1 10b.
  • the first surface 1 10a may form the exterior of the structure (e.g., the exterior of the packaging 100) and the second surface 110b may bond with other structures.
  • the first surface 110a may be printed or may include an ink layer to provide labeling, graphics, logos, product information, or the like.
  • the printed matter or ink layer may be printed using any known printing process.
  • a surface treatment 120 may be applied to the second side 110b of the paper structure 110.
  • the surface treatment 120 may be configured to promote adhesion between the paper layer and a barrier layer and/or increase the surface energy of the paper structure 1 10 (and in some cases the topcoat 1 13), to improve wettability and adhesion of inks, coatings and adhesives.
  • the surface treatment 120 may be a corona treatment, a flame treatment, a plasma treatment, or similar surface treatment.
  • the barrier layer 130 may be applied to the paper structure 110, and in some embodiments, to the primer 117, metal layer 1 11 , or surface treated topcoat 113, whichever is the innermost layer of the paper structure 1 10.
  • the barrier layer 130 may include multiple layers including an oxygen barrier 133 and sealant layer 135.
  • the oxygen barrier 133 may be a printable coating.
  • the oxygen barrier 133 may be printed or applied to the paper structure 1 10 with a pilot press in some embodiments.
  • the oxygen barrier 133 may be water-based.
  • the oxygen barrier 133 may be a polyvinyl alcohol (PVA) solution.
  • the oxygen barrier 133 may be produced by Siegwerk.
  • the barrier layer 133 may be filtered out of the recycling stream, while in other embodiments the barrier layer 133 may dissolve in a standard paper recycling stream, thus allowing the paper fibers within paper structure 1 10 to be recyclable.
  • the oxygen barrier 133 may be applied to the paper structure 1 10 at a ratio of up to 1 pound of oxygen barrier per ream, up to 0.8 pounds of oxygen barrier per ream, or up to 0.6 pounds of oxygen barrier 133 per ream. In some embodiments, the oxygen barrier may be applied in a ratio of between 0.4 pounds per ream to 1 .0 pounds per ream, or between 0.5 pounds per ream to 0.7 pounds per ream.
  • the barrier layer 130 may provide a barrier for migratory components between the product and the paper layer 115. In some embodiments, the barrier layer 130 may prevent any grease, mineral oil or similar from transferring from the product to the paper layer 115 thereby preventing grease stains or creases within the paper layer 115.
  • Crosslinking may also improve barrier properties of the coating and, in turn, the resulting sheet or container.
  • Any other cross-linking methods could be utilized to crosslink the PVOH, which may include, but is not limited to chemical, physical, or mechanical cross-linking.
  • electron beam crosslinking methodologies could be applied to crosslink the PVOH within the coating material, optionally after the coating has been applied and dried.
  • the barrier layer 130 may include a heat seal coating 135.
  • the heat seal coating 135 may be applied to or coated onto the oxygen barrier 133 opposite the paper structure 110 in some embodiments.
  • the heat seal coating 135 may be a heat seal coating, while in other embodiments the heat seal coating 135 may be a cold seal.
  • the heat seal coating 135 may be solvent-based, in some embodiments, while the heat seal coating 135 may be water-based in others.
  • the heat seal coating 135 has the same chemistry as the oxygen barrier 133, while in other embodiments the barrier layer 130 defines alternating chemistries.
  • the oxygen barrier 133 may be waterbased and the heat seal coating 135 may be solvent-based.
  • the barrier layer 130 may maintain distinct layers that do not dissolve into each other during printing or coating.
  • both the oxygen barrier 133 and the heat seal coating 135 may be water based.
  • the oxygen barrier 133 is dried completely before application of the heat seal coating 135.
  • the heat seal coating 135 may be sprayed, coated, extruded, or printed onto the oxygen barrier 133.
  • the heat seal coating 135 may comprise PET based chemistry, for example ACTEseal®, produced by Actega, or similar.
  • the heat seal coating 135 may applied be to the oxygen barrier 133 at a ratio between 1 -4 pounds of heat seal coating per ream, between 2-3 pounds of heat seal coating per ream, or even between 2.25-2.75 pounds of heat seal coating per ream.
  • the heat seal coating 135 may be a cold seal structure.
  • the cold seal may be coated with a release overlacquer.
  • the barrier layer 130 may define a barrier layer thickness of less than 10 microns, in some embodiments less than 8 microns and in some embodiments less than 6 microns.
  • the barrier layer 130 thickness may be correlated to the thickness of the paper structure 1 10. For example, a thicker barrier layer 130, may be utilized with a thicker paper structure 1 10. Further, a thinner barrier layer 130, may allow a thinner paper structure 1 10.
  • the packaging structure 100 may be formed into a container for dry products including seasoning, mixes, cookies, crackers, nuts and the like.
  • the barrier layer 130 may comprise the product-facing side of a food package, and the paper structure 110, specifically the paper layer 1 15 in some embodiments, may be the outer or exterior layer.
  • the barrier layer 130 may further act as a barrier between the ink contained in or on the paper layer 1 15 and the product contained within the package.
  • the packaging structure 100 may be formed into a flow wrap package, a bar wrap, a slug wrap, a pouch, and pillow package, and in some embodiments, may be configured into a stand-up package.
  • a paper structure 210 may be advanced from a first structure supply roll 21 1 .
  • a paper layer may be coated with or otherwise adhered to a primer, a metal, and/or a topcoat (not shown).
  • One or both surfaces of the paper structure 210 may be treated with a surface treatment, at station 220.
  • the surface treatment may be corona discharge or a flame treatment to render the surface more receptive to inks and/or more readily bondable to the barrier layer that is subsequently applied to the surface.
  • the paper structure 210 may be optionally pre-printed as a part of the presently described manufacturing process.
  • the paper layer 210 may be advanced to a printing station 235 during manufacture. The inks and printing may be applied to the first side 110a (i.e., exterior surface) of the paper structure 110 in an embodiment.
  • an oxygen barrier 133 is applied to the second side 1 10b (i.e., interior surface) paper structure 210 adjacent the surface treatment at a barrier coating station 233.
  • the oxygen barrier is at least partially dried and advances to a heat seal coating station 235, where the heat seal coating 135 may be applied.
  • the paper packaging structure may be formed into packages or may be cut and stacked and/or rolled to be transported to a separate facility for packaging, at station 255.
  • Example 1 In this experiment, the inventors compared the oxygen and moisture transmission rates of a paper structure with a surface treatment as outlined herein versus a paper structure without the surface treatment.
  • the paper structure 110 was a metalized densified paper including a primer layer and a topcoat layer.
  • the barrier layer 130 including oxygen barrier 133 and heat coating layer 135, was applied to the paper structure 1 10 at the same ratio.
  • the oxygen transmission rate (OTR) for each sample was measured as cc/100in 2 /day at approximately 23 °C, and 0% relative humidity in 100% O2.
  • the water vapor transmission rate (WVTR) for each sample was measured at g/100in2/day at about 37.8° C, and 90% relative humidity.
  • Table 1 The results of the testing without a barrier coating are shown in Table 1 , and the results of the testing with the barrier coating are shown in Table 2.
  • the surface treatment leads to a significantly lower WVTR and lower OTR.
  • the goal for WVTR is to be below 0.5 g/100in 2 /day.
  • the structure 100 of the present invention has an WVTR of less than or equal to 0.5 g/in 2 /day.
  • the goal for oxygen transmission is to be below 0.1 cc/100in2/day.
  • the structure 100 of the present invention has an oxygen transmission of less than or equal to 0.1 cc/100in 2 /day.
  • the OTR decreased by over 95% when compared to the paper layer without a barrier coating, while the WVTR decreased by over 30%.
  • the oxygen transmission rate was tested with an Ox-Tran 702 with 100% O2 and at 23 C and 0% RH.
  • the oxygen transmission rates were compensated to a barometric pressure of 760 mmHg.
  • the metallized surface was positioned towards the carrier gas for testing, in accordance with ASTM 3985.

Landscapes

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

Abstract

L'invention concerne une structure d'emballage en papier. La structure d'emballage en papier comprend une structure en papier ayant une surface interne et une surface externe. La structure comprend en outre une couche barrière disposée adjacente à la surface interne de la structure en papier. La couche barrière comprend une barrière à l'oxygène à base d'eau et une couche d'étanchéité à base de solvant, la barrière à l'oxygène étant positionnée adjacente à la surface interne de la structure en papier.
PCT/US2023/021690 2022-05-26 2023-05-10 Papier fonctionnel multicouche WO2023229845A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US202263346117P 2022-05-26 2022-05-26
US63/346,117 2022-05-26

Publications (1)

Publication Number Publication Date
WO2023229845A1 true WO2023229845A1 (fr) 2023-11-30

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ID=86710837

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2023/021690 WO2023229845A1 (fr) 2022-05-26 2023-05-10 Papier fonctionnel multicouche

Country Status (2)

Country Link
US (1) US20230382618A1 (fr)
WO (1) WO2023229845A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3603955A1 (fr) * 2017-03-31 2020-02-05 Dai Nippon Printing Co., Ltd. Stratifié de barrière aux gaz, ainsi que matériau d'emballage de barrière aux gaz et sac d'emballage d'oreiller formés chacun dudit stratifié
WO2022023077A1 (fr) * 2020-07-29 2022-02-03 Société des Produits Nestlé S.A. Matériau d'emballage à base de papier métallisé à couches multiples

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3603955A1 (fr) * 2017-03-31 2020-02-05 Dai Nippon Printing Co., Ltd. Stratifié de barrière aux gaz, ainsi que matériau d'emballage de barrière aux gaz et sac d'emballage d'oreiller formés chacun dudit stratifié
WO2022023077A1 (fr) * 2020-07-29 2022-02-03 Société des Produits Nestlé S.A. Matériau d'emballage à base de papier métallisé à couches multiples

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US20230382618A1 (en) 2023-11-30

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