WO2017170462A1 - 紙製バリア材料 - Google Patents
紙製バリア材料 Download PDFInfo
- Publication number
- WO2017170462A1 WO2017170462A1 PCT/JP2017/012500 JP2017012500W WO2017170462A1 WO 2017170462 A1 WO2017170462 A1 WO 2017170462A1 JP 2017012500 W JP2017012500 W JP 2017012500W WO 2017170462 A1 WO2017170462 A1 WO 2017170462A1
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- WIPO (PCT)
- Prior art keywords
- paper
- barrier layer
- water vapor
- barrier material
- barrier
- Prior art date
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Classifications
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- 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
- D21H27/30—Multi-ply
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
- B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/16—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating
- B32B37/18—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of discrete sheets or panels only
- B32B37/182—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of discrete sheets or panels only one or more of the layers being plastic
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- 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
- B65D65/40—Applications of laminates for particular packaging purposes
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- 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
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/24—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants
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- 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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
- D21H11/04—Kraft or sulfate pulp
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- 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
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- 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
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- 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
- D21H19/824—Paper comprising more than one coating superposed two superposed coatings, both being non-pigmented
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- 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
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/12—Coating on the layer surface on paper layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/26—Polymeric coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/28—Multiple coating on one surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/514—Oriented
- B32B2307/518—Oriented bi-axially
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
- B32B2307/7242—Non-permeable
- B32B2307/7244—Oxygen barrier
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
- B32B2307/7242—Non-permeable
- B32B2307/7246—Water vapor barrier
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2323/00—Polyalkenes
- B32B2323/04—Polyethylene
- B32B2323/046—LDPE, i.e. low density polyethylene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
- B32B2439/70—Food packaging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2553/00—Packaging equipment or accessories not otherwise provided for
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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Definitions
- the present invention relates to a paper barrier material used for packaging materials such as food or containers and cups.
- gas barrier properties particularly oxygen barrier properties
- paper packaging materials It is important to impart gas barrier properties (particularly oxygen barrier properties) to paper packaging materials in order to protect various products to be packaged from deterioration due to gas, for example, oxidation due to oxygen.
- a gas barrier property is imparted to a paper packaging material in order to provide a gas barrier layer on a paper base material (base paper) as a metal foil made of a metal such as aluminum, a metal vapor-deposited film, polyvinyl alcohol or ethylene-vinyl alcohol.
- base paper a paper base material
- Paper packaging materials with other gas barrier properties than those mentioned above include paper gas barrier materials having a gas barrier layer composed of a water-soluble polymer and an inorganic layered compound (Patent Document 1, Patent Document 2), and specific on the coating layer A paper-made gas barrier material (Patent Document 2) provided with a barrier layer made of a vinyl alcohol polymer is disclosed.
- imparting water resistance (particularly water vapor barrier property) to the paper packaging material is important for protecting various products to be packaged from deterioration due to water vapor.
- a resin film excellent in water vapor barrier property on a paper base material, or a film coated with a resin excellent in water vapor barrier properties, etc. is laminated on a paper base material, or The method of pasting has been mainly used.
- Patent Document 3 As a paper packaging material provided with water vapor barrier properties other than these methods, a packaging paper (Patent Document 3) having a moisture-proof layer made of synthetic resin latex, wax and inorganic fine particles is disclosed.
- a packaging material in which both a gas barrier property and a water vapor barrier property are imparted to a paper packaging material a packaging material in which a resin having a gas barrier property and a resin having a water vapor barrier property are laminated on a paper base material is known. .
- the packaging material in which a resin with gas barrier properties and a resin with water vapor barrier properties are laminated on a paper base material (base paper) has a problem that it cannot respond to various required qualities because there are restrictions on the types of resin that can be laminated. was there.
- the packaging material provided by coating a paper base material (base paper) with a resin having a gas barrier property and a resin having a water vapor barrier property has few restrictions on the type of resin that can be used, and therefore, various requirements for quality can be achieved. Response is possible.
- a packaging material having both gas barrier properties and water vapor barrier properties for example, a packaging material having gas barrier properties of Patent Document 1 or Patent Document 2, a good water vapor barrier is provided.
- gas barrier properties cannot be obtained.
- an object of the present invention is to provide a paper barrier material having both excellent gas barrier properties and water vapor barrier properties, in which a water vapor barrier layer and a gas barrier layer are provided in this order on a paper base material.
- the present invention provides the following [1] to [11].
- the water vapor barrier layer contains a water vapor barrier resin and a water repellent
- the gas barrier layer comprises A paper barrier material comprising a water-soluble polymer and a surfactant.
- the surfactant is an acetylenic diol surfactant.
- the difference between the wet tension of the water vapor barrier layer and the surface tension of the paint for forming the gas barrier layer is ⁇ 20 mN / m, according to any one of [1] to [3] Paper barrier material.
- [6] The paper barrier material according to [5], wherein the laminate layer is an extruded laminate layer or a dry laminate layer.
- a paper barrier packaging material that uses the paper barrier material according to any one of [1] to [8] for packaging purposes.
- the water vapor barrier layer contains a water vapor barrier resin and a water repellent
- the gas barrier layer comprises A method for producing a paper barrier material comprising a laminate layer comprising a polyolefin resin as a main component on at least one side of a paper barrier material containing a water-soluble polymer and a surfactant, wherein the laminate layer is melt extruded
- a method for producing a paper barrier material characterized by being provided by a laminating method or a dry laminating method.
- a paper barrier material having both a gas barrier property and a water vapor barrier property in which a water vapor barrier layer and a gas barrier layer are provided in this order on a paper base material.
- the present invention is a paper barrier material in which a plurality of coating layers are provided on a paper substrate (hereinafter sometimes referred to as “base paper”), and the plurality of coating layers are formed on the paper substrate.
- base paper a paper substrate
- the present invention relates to a paper barrier material, wherein the gas barrier layer contains a water-soluble polymer and a surfactant.
- a water-soluble polymer As the resin having a gas barrier property used in the gas barrier layer, a water-soluble polymer is generally used as exemplified below.
- the gas barrier layer containing the water-soluble polymer deteriorates due to the moisture in the air or the moisture in the air that permeates through the paper substrate.
- the water vapor barrier layer affects the gas barrier layer such as moisture in the paper substrate (deterioration). Can be prevented.
- the paper barrier material of the present invention has good water vapor barrier properties and gas barrier properties.
- the paper base is a sheet made of pulp, filler, and various auxiliaries.
- Pulp includes chemical pulp such as hardwood bleached kraft pulp (LBKP), softwood bleached kraft pulp (NBKP), sulfite pulp (SP), stone grind pulp (SGP), thermomechanical pulp (TMP), chemithermomechanical pulp ( Non-wood fibers obtained from mechanical pulp such as CTMP), deinked pulp (DIP), kenaf, bamboo, hemp and the like can be used, and these can be used by appropriately blending them.
- LLKP hardwood bleached kraft pulp
- NKP softwood bleached kraft pulp
- SP sulfite pulp
- SGP stone grind pulp
- TMP thermomechanical pulp
- chemithermomechanical pulp Non-wood fibers obtained from mechanical pulp such as CTMP
- DIP deinked pulp
- kenaf bamboo, hemp and the like
- filler known fillers such as white carbon, talc, kaolin, clay, heavy calcium carbonate, light calcium carbonate, titanium oxide, zeolite, and synthetic resin filler can be used.
- sulfuric acid bands and various anionic, cationic, nonionic or amphoteric yield improvers, drainage improvers, paper strength enhancers and internal additive sizing agents, etc. Can be used.
- dyes, fluorescent brighteners, pH adjusters, antifoaming agents, pitch control agents, slime control agents and the like can be added as necessary.
- the production method (paper making) of the paper substrate is not particularly limited. Acid paper making, neutral paper making using a known long net former, on-top hybrid former, gap former machine, and circular former machine.
- Paper base materials can be produced by paper making using an alkali paper making method.
- the paper base material preferably has a basis weight of 20 g / m 2 or more and 500 g / m 2 or less used for general coated paper base paper.
- the drug used include oxidized starch, hydroxyethyl etherified starch, oxygen-modified starch, polyacrylamide, polyvinyl alcohol, surface sizing agent, water-resistant agent, water retention agent, thickener, lubricant, etc.
- the surface treatment method of the paper substrate is not particularly limited, but a known coating device such as a rod metalling type size press, a pound type size press, a gate roll coater, a spray coater, a blade coater, or a curtain coater is used. be able to.
- the water vapor barrier layer contains a water vapor barrier resin and a water repellent.
- the water vapor barrier resin (hereinafter sometimes referred to as resin) includes styrene / butadiene, styrene / acrylic, ethylene / vinyl acetate, butadiene / methyl methacrylate, vinyl acetate / butyl acrylate, and the like.
- Synthetic adhesives such as various copolymers, maleic anhydride copolymers, acrylic acid / methyl methacrylate copolymers, etc. can be used alone or in admixture of two or more. Of these, styrene / acrylic copolymers are preferred from the viewpoint of water vapor barrier properties.
- synthetic adhesives such as polyvinyl alcohol, maleic anhydride copolymer, acrylic acid / methyl methacrylate copolymer, and proteins such as casein, soy protein, and synthetic protein
- Water-soluble polymers such as starches such as oxidized starch, cationized starch, urea phosphated starch, hydroxyethyl etherified starch, and cellulose derivatives such as carboxymethylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, etc. Is also possible.
- the water repellent contained in the water vapor barrier layer of the present invention contains a paraffinic water repellent mainly composed of alkane compounds, natural oil and fat water repellent derived from animals and plants such as carnauba and lanoin, silicone or a silicone compound.
- a paraffinic water repellent mainly composed of alkane compounds, natural oil and fat water repellent derived from animals and plants such as carnauba and lanoin, silicone or a silicone compound.
- examples thereof include a silicone-containing water repellent and a fluorine-containing water repellent containing a fluorine compound, and among these, a paraffin-based water repellent is preferably used from the viewpoint of expression of water vapor barrier performance.
- These water repellents can be used alone or in combination of two or more.
- the blending amount of the water repellent is not particularly limited, but the blending ratio (dry weight) of the water vapor barrier resin and the water repellent is 100 parts by weight (dry weight) of the water vapor barrier resin.
- the water repellent (dry weight) is preferably 1 part by weight or more and 1000 parts by weight or less.
- the blending amount of the water repellent is 1 part by weight or more and less than 100 parts by weight, the gas barrier layer is easily formed uniformly, and excellent gas barrier properties can be exhibited.
- the water-repellent effect is further enhanced when the blending amount of the water-repellent agent is 100 parts by weight or more and 1000 parts by weight or less, an excellent water vapor barrier property can be exhibited.
- the blending amount of the water repellent is less than 1 part by weight, sufficient water vapor barrier property may not be obtained. Furthermore, when the amount exceeds 1000 parts by weight, the gas barrier layer provided on the water vapor barrier layer cannot be formed uniformly, so that sufficient gas barrier properties may not be exhibited.
- the water vapor barrier layer contains a pigment from the viewpoint of adhesion between the water vapor barrier layer and the gas barrier layer.
- a pigment from the viewpoint of adhesion between the water vapor barrier layer and the gas barrier layer.
- pigments kaolin, clay, engineered kaolin, delaminated clay, heavy calcium carbonate, light calcium carbonate, mica, talc, titanium dioxide, barium sulfate, calcium sulfate, zinc oxide, silicic acid, silicate, colloidal silica, satin
- An inorganic pigment such as white and an organic pigment such as a solid type, a hollow type, or a core-shell type can be used alone or in admixture of two or more.
- inorganic pigments such as kaolin, mica, and talc having a flat shape are preferable from the viewpoints of improving water vapor barrier properties and suppressing penetration of the gas (oxygen) barrier layer, and have an average particle diameter of 5 ⁇ m or more and an aspect ratio. It is preferable to use 10 or more inorganic pigments alone or in admixture of two or more.
- the above-mentioned water vapor barrier layer containing a pigment having an average particle diameter of 5 ⁇ m or more and an aspect ratio of 10 or more has a pigment having an average particle diameter of 5 ⁇ m or less. It is preferable to contain. Water vapor that has a structure in which a pigment having an average particle diameter of 5 ⁇ m or less enters between pigments having an average particle diameter of 5 ⁇ m or more and an aspect ratio of 10 or more that exists in a multi-layered manner, is forced to move along the surface of a flat pigment, The movement is blocked by the small pigment particles.
- a pigment having a different flatness and average particle size is contained in the water vapor barrier layer, a pigment having a small particle size is formed in a space formed between adjacent flat and large pigment particles in the water vapor barrier layer. Since the water vapor is filled and the water vapor bypasses the pigment, it exhibits a high water vapor barrier property as compared with a water vapor barrier layer in which a pigment having a small particle diameter is not mixed.
- the blending amount of the resin and the pigment should be in the range of 5 parts by weight or more and 200 parts by weight or less of the resin (dry weight) with respect to 100 parts by weight of the pigment (dry weight). More preferably, the amount is not less than 10 parts by weight and not more than 150 parts by weight of the resin.
- the water vapor barrier layer includes various commonly used water-soluble polymers, dispersants, thickeners, water retention agents, antifoaming agents, water resistance agents, dyes, fluorescent dyes, crosslinking agents, etc. Auxiliaries can be used.
- the coating amount of the water vapor barrier layer is preferably set to 3 g / m 2 or more 50 g / m 2 or less by dry weight, more preferably at 5 g / m 2 or more 40 g / m 2 or less, 7 g / M 2 or more and 30 g / m 2 or less is particularly preferable. If the coating amount is less than 3 g / m 2, it becomes difficult to completely coat the base paper with the coating liquid, and sufficient water vapor barrier properties cannot be obtained, and the gas barrier layer penetrates into the paper substrate, so that it is uniform. There is a problem that a gas barrier property cannot be obtained.
- the wet tension of the water vapor barrier layer is preferably 10 mN / m or more and 60 mN / m or less, and 15 mN / m or more and 50 mN / m or less. It is more preferable.
- water-soluble polymer used in the gas barrier layer in the present invention examples include fully saponified polyvinyl alcohol, partially saponified polyvinyl alcohol, ethylene copolymerized polyvinyl alcohol, polyvinyl pyrrolidone, starch, methylcellulose, carboxymethylcellulose, and sodium alginate. can do.
- polyvinyl alcohol and carboxymethyl cellulose are preferable, and polyvinyl alcohol is more preferable.
- a gas barrier layer contains a pigment.
- pigments used in the gas barrier layer kaolin, clay, engineered kaolin, delaminated clay, heavy calcium carbonate, light calcium carbonate, mica, talc, titanium dioxide, barium sulfate, calcium sulfate, zinc oxide, silicic acid, Inorganic pigments such as silicate, colloidal silica, satin white and mica, and organic pigments such as solid type, hollow type and core-shell type can be used singly or in combination.
- an inorganic pigment from the viewpoint of gas barrier properties, it is more preferable to use an inorganic pigment having an aspect ratio of 10 or more, and it is more preferable to use an inorganic pigment having an aspect ratio of 30 or more.
- a gas such as oxygen passes around the pigment.
- the gas barrier layer which consists of a water-soluble polymer which does not contain a pigment, it has a favorable water vapor barrier property and an excellent gas barrier property in a high humidity atmosphere.
- the mixing ratio (dry weight) of the pigment and water-soluble polymer contained in the gas barrier layer is 1/100 (parts by weight) to 1000/100 (parts by weight) of pigment / water-soluble polymer. preferable. If the ratio of the pigment is out of the above range, sufficient gas barrier properties are not exhibited. In the present invention, when the pigment is mixed in the water-soluble polymer, it is preferable to add and mix the slurry of the pigment.
- the gas barrier layer contains a surfactant.
- the ionicity of the surfactant is not limited, and any type of anionic surfactant, cationic surfactant, amphoteric surfactant and nonionic surfactant can be used alone or in combination of two or more. Can be used in combination.
- Specific types include silicon surfactants, fluorine surfactants, alcohol surfactants, acetylene surfactants having an acetylene group, acetylene diol surfactants having an acetylene group and two hydroxyl groups, Alkyl sulfonic acid surfactants having an alkyl group and a sulfonic acid, ester surfactants, amide surfactants, amine surfactants, alkyl ether surfactants, phenyl ether surfactants, sulfate esters Surfactants, phenolic surfactants and the like can be exemplified. Among these, it is preferable to use an acetylenic diol surfactant that particularly improves the leveling property of the paint. In addition, when the leveling property of a coating material improves, since the uniformity of a gas barrier layer will improve, gas barrier property will improve.
- the gas barrier layer in addition to water-soluble polymers and pigments, various commonly used agents such as dispersants, thickeners, water retention agents, antifoaming agents, water resistance agents, dyes, fluorescent dyes, crosslinking agents, etc. Auxiliaries can be used.
- the coating amount of the gas barrier layer is preferably in a 0.2 g / m 2 or more 20 g / m 2 or less by dry weight. If the coating amount is less than 0.2 g / m 2 , a uniform gas barrier layer cannot be formed, and there is a problem that sufficient gas barrier properties cannot be obtained. On the other hand, when it is more than 20 g / m 2 , the drying load at the time of coating increases, which is not preferable from the viewpoint of both operation and cost.
- the paint containing the water-soluble polymer and the surfactant for forming the gas barrier layer is water-based and needs for green chemistry as a packaging material and safety in the working environment during production. It is preferable from the viewpoint of securing the property.
- the aqueous system means that no organic solvent is used as a constituent component of the paint.
- the surface tension of the coating material for forming the gas barrier layer is preferably adjusted to 10 mN / m or more and 60 mN / m or less, and is adjusted to 15 mN / m or more and 50 mN / m or less. More preferably.
- the surface tension of the paint is ⁇ 20 mN / m with respect to the wet tension on the surface of the water vapor barrier layer.
- the method for coating the water vapor barrier layer and the gas barrier layer is not particularly limited, and a known coating apparatus can be used. Examples include a blade coater, a bar coater, a roll coater, an air knife coater, a reverse roll coater, a curtain coater, a spray coater, a size press coater, and a gate roll coater.
- a normal method such as a steam heater, a gas heater, an infrared heater, an electric heater, a hot air heater, a microwave, a cylinder dryer, or the like is used.
- the bio-derived film includes bioplastics having no biodegradability such as propanediol obtained by fermentation and polyester (PTT) of terephthalic acid derived from fossil resources, soybean polyol, polyurethane, and the like.
- bioplastics such as biodegradable polylactic acid (PLA), starch resin, and polyhydroxyalkanoate.
- the main component is a polyolefin-based resin such as polyethylene or polypropylene from the viewpoint of protection of contents as the packaging material and ease of heat sealing. Further, one or more of these laminate layers can be provided depending on the purpose.
- a layer can be provided.
- a polyolefin-based resin such as polyethylene or polypropylene from the viewpoint of protecting the contents and facilitating heat sealing.
- one or more of these laminate layers can be provided depending on the purpose.
- the bio-derived film includes bioplastics having no biodegradability such as propanediol obtained by fermentation and polyester (PTT) of terephthalic acid derived from fossil resources, soybean polyol, polyurethane, and the like.
- bioplastics such as biodegradable polylactic acid (PLA), starch resin, and polyhydroxyalkanoate.
- the lamination method of the laminate layer is not particularly limited, and a known method such as a conventional melt extrusion lamination method, a dry lamination method using a film, or a direct melt coating method can be used. It is preferable to provide a laminate layer by a laminate method or a dry laminate method from the viewpoint of securing a uniform laminate layer and ease of handling.
- a barrier film can also be bonded to at least one surface of the paper barrier material of the present invention.
- the barrier film to be bonded is not particularly limited, and is a metal foil made of a metal such as aluminum, a vapor-deposited film on which various metals such as aluminum are vapor-deposited, polyvinyl alcohol, an ethylene-vinyl alcohol copolymer, polyvinylidene chloride.
- Examples thereof include a film mainly composed of a resin such as polyacrylonitrile, a film coated with such a resin, and a ceramic vapor deposited film on which an inorganic oxide such as silicon oxide or aluminum oxide is deposited.
- a vapor-deposited film in which various metals such as aluminum are vapor-deposited, or a ceramic vapor-deposited film in which an inorganic oxide is vapor-deposited is preferable.
- 1 layer or multiple layers of these films can be bonded.
- the method for bonding the paper barrier material and the barrier film is not particularly limited, but a known method such as a conventional melt extrusion laminating method, a dry laminating method using a film, or a direct melt coating method may be used. it can.
- the paper barrier material of the present invention can be suitably used for paper barrier packaging materials used for packaging materials such as packaging materials, containers, and cups.
- the paper barrier material of the present invention is a paper barrier material, or laminated with various general-purpose films, barrier films, aluminum foils, etc., and used for packaging materials such as food, containers and cups, or industrial materials. It can be a body.
- the present invention will be specifically described with reference to examples. However, the present invention is not limited to these examples.
- the part and% in an example show a weight part and weight%, respectively.
- the coating liquid and the functional paper obtained were tested based on the evaluation method as shown below.
- Water vapor permeability Measured using a moisture permeability measuring device (Dr. Lyssy, L80-4000) under conditions of a temperature of 40 ⁇ 0.5 ° C. and a relative humidity of 90 ⁇ 2%. In addition, it measured using the paper-made barrier materials before forming a laminate layer.
- Oxygen permeability Measured using an oxygen permeability measuring device (manufactured by MOCON, OX-TRAN 2/21) under conditions of 23 ° C.-0% RH and 23 ° C.-85% RH. In addition, it measured using the paper-made barrier materials before forming a laminate layer.
- Example 1 (Preparation of paper substrate) Canadian standard freeness (CSF) 500 ml of hardwood kraft pulp (LBKP) and CSF 530 ml of softwood kraft pulp (NBKP) were blended at a weight ratio of 80/20 to obtain raw pulp.
- CSF Canadian standard freeness
- LKP hardwood kraft pulp
- NKP softwood kraft pulp
- PAM polyacrylamide
- ALD alkyl ketene dimer
- the coating liquid A is coated on one side using a blade coater at a coating speed of 300 m / min so that the coating amount (dry) is 15 g / m 2 and dried, and then the coating liquid is coated thereon. and applied onto one side using a roll coater B in the coating amount (dried) 5.0 g / m 2 and comprising as coating speed 300 meters / min, to obtain a paper barrier material.
- the wetting tension on the surface of the water vapor barrier layer was 40 mN / m.
- Example 2 Made of paper in the same manner as in Example 1 except that the surfactant blended in the gas barrier layer coating solution was changed to an acetylenic diol surfactant (manufactured by Nissin Chemical Industry Co., Ltd., product name: Surfynol PSA-336). A barrier material was obtained. The surface tension of the gas barrier layer coating solution was 30 mN / m.
- the surfactant compounded in the coating solution for the gas barrier layer is 1.5 parts of acetylenediol surfactant (manufactured by Nissin Chemical Industry Co., Ltd., product name: Surfynol PSA-336) with respect to 100 parts of polyvinyl alcohol (solid).
- a paper barrier material was obtained in the same manner as in Example 1 except that the blending was performed so that The surface tension of the gas barrier layer coating solution was 25 mN / m.
- Example 4 A paper barrier was prepared in the same manner as in Example 1 except that the surfactant compounded in the coating liquid for the gas barrier layer was changed to an alkyl sulfonic acid surfactant (manufactured by Nippon Emulsifier Co., Ltd., product name: Newcol-291-M). Obtained material.
- the surface tension of the gas barrier layer coating solution was 45 mN / m.
- Example 5 A paper barrier was prepared in the same manner as in Example 1 except that the water repellent was changed to a paraffinic water repellent (product name: WR3900, paraffin wax emulsion) in the preparation of the coating solution for the water vapor barrier layer. Obtained material. The wetting tension on the surface of the water vapor barrier layer was 35 mN / m.
- a paraffinic water repellent product name: WR3900, paraffin wax emulsion
- Example 6 In the preparation of the coating solution for the water vapor barrier layer, the same procedure as in Example 1 was conducted except that the water repellent was changed to a natural oil-based water repellent (product name: KW-606, carnauba wax emulsion). A paper barrier material was obtained. The wetting tension on the surface of the water vapor barrier layer was 50 mN / m.
- Example 7 A paper was prepared in the same manner as in Example 1 except that low-density polyethylene (manufactured by Nippon Polyethylene Co., Ltd., product name: LC602A) was laminated on both sides of the paper barrier material obtained in Example 1 by coextrusion lamination. A barrier material made was obtained.
- low-density polyethylene manufactured by Nippon Polyethylene Co., Ltd., product name: LC602A
- Example 8 On the barrier surface of the paper barrier material obtained in Example 1, a linear low density polyethylene film (manufactured by Phutamura Chemical Co., Ltd., product name: LL-XMTN, 20 ⁇ m thickness) is laminated by dry lamination, and the non-barrier surface A paper barrier material was obtained in the same manner as in Example 1 except that a biaxially stretched polypropylene film (product name: FOA, 20 ⁇ m thickness) was laminated on the top (on the base paper surface) by dry lamination.
- a biaxially stretched polypropylene film product name: FOA, 20 ⁇ m thickness
- Example 9 Similar to Example 1 except that an aluminum-deposited PET film (manufactured by Nakai Kogyo Co., Ltd., product name: MY-15) was bonded on the barrier surface of the paper barrier material obtained in Example 1 by the dry laminating method. Thus, a paper barrier material was obtained.
- an aluminum-deposited PET film manufactured by Nakai Kogyo Co., Ltd., product name: MY-15
- Example 10 Similar to Example 1 except that an aluminum-deposited PET film (manufactured by Nakai Kogyo Co., Ltd., product name: MY-15) was bonded on the barrier surface of the paper barrier material obtained in Example 2 by the dry laminating method. Thus, a paper barrier material was obtained.
- an aluminum-deposited PET film manufactured by Nakai Kogyo Co., Ltd., product name: MY-15
- Example 11 Alumina (ceramic) vapor-deposited PET film (manufactured by Toppan Printing Co., Ltd., product name: GL-ARH-F) was bonded to the barrier surface of the paper barrier material obtained in Example 1 by the dry laminating method. A paper barrier material was obtained in the same manner as in Example 1.
- Example 12 Except that an EVOH film (manufactured by Kuraray Co., Ltd., product name: Eval film EF-XL) was bonded to the barrier surface of the paper barrier material obtained in Example 1 by the dry laminating method, the same as in Example 1. A paper barrier material was obtained.
- Eval film EF-XL manufactured by Kuraray Co., Ltd., product name: Eval film EF-XL
- Example 13 A paper barrier material was obtained in the same manner as in Example 1 except that the paper base material was changed to cup base paper (basis weight 270 g / m 2 ). Furthermore, the paper was made in the same manner as in Example 1 except that an aluminum-deposited PET film (manufactured by Nakai Kogyo Co., Ltd., product name: MY-15) was bonded to the barrier surface of the obtained paper barrier material by the dry laminating method. A barrier material made was obtained.
- an aluminum-deposited PET film manufactured by Nakai Kogyo Co., Ltd., product name: MY-15
- Example 14 In the preparation of the coating solution for the water vapor barrier layer, the blending amount of the paraffinic water repellent is changed from 100 parts (solid content) to 500 parts (solid content) with respect to 100 parts of the inorganic pigment.
- the wetting tension on the surface of the water vapor barrier layer was 20 mN / m, and the surface tension of this gas barrier layer coating solution was 20 mN / m.
- Example 15 In the preparation of the coating solution for the water vapor barrier layer, the blending amount of the paraffinic water repellent is changed from 100 parts (solid content) to 1000 parts (solid content) with respect to 100 parts of the inorganic pigment.
- the wetting tension on the surface of the water vapor barrier layer was 15 mN / m, and the surface tension of this gas barrier layer coating solution was 15 mN / m.
- Example 16 In the preparation of the coating solution for the water vapor barrier layer, the blending amount of the paraffinic water repellent is changed from 100 parts (solid content) to 500 parts (solid content) with respect to 100 parts of the inorganic pigment.
- a paper barrier material was obtained in the same manner as in Example 2 except that the content was changed to 5 parts (solid content).
- the wetting tension on the surface of the water vapor barrier layer was 20 mN / m, and the surface tension of this gas barrier layer coating solution was 20 mN / m.
- Example 17 In the preparation of the coating solution for the water vapor barrier layer, the water repellent was changed to a paraffinic water repellent (product name: WR3900, paraffin wax emulsion, manufactured by Seiko PMC), and the blending amount was 100 parts per 100 parts of the inorganic pigment. Parts (solid content) is changed to 500 parts (solid content), and the amount of the silicone surfactant blended in the gas barrier layer coating solution is from 1 part (solid content) to 5 parts per 100 parts of polyvinyl alcohol. A paper barrier material was obtained in the same manner as in Example 1 except that (solid content) was changed. The wetting tension on the surface of the water vapor barrier layer was 25 mN / m, and the surface tension of this gas barrier layer coating solution was 20 mN / m.
- Example 1 A paper barrier material was obtained in the same manner as in Example 1 except that a gas barrier layer and a water vapor barrier layer were provided in this order on the paper substrate.
- Example 3 A paper barrier material was obtained in the same manner as in Example 1 except that the water vapor barrier layer was not provided.
- Example 7 in which polyethylene resin was extruded and laminated, and Examples 8 to 13 in which films were laminated by a dry lamination method had excellent water vapor barrier properties.
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Abstract
Description
〔1〕 紙基材上に、水蒸気バリア層、ガスバリア層がこの順で設けられた紙製バリア材料において、前記水蒸気バリア層が水蒸気バリア性樹脂及び撥水剤を含有し、且つ前記ガスバリア層が水溶性高分子及び界面活性剤を含有することを特徴とする紙製バリア材料。
〔2〕 前記水溶性高分子が、ポリビニルアルコールであることを特徴とする〔1〕に記載の紙製バリア材料。
〔3〕 前記界面活性剤が、アセチレンジオール系界面活性剤であることを特徴とする〔1〕又は〔2〕に記載の紙製バリア材料。
〔4〕 前記水蒸気バリア層の濡れ張力とガスバリア層を形成させる塗料の表面張力の差が、±20mN/mであることを特徴とする〔1〕~〔3〕のいずれか一項に記載の紙製バリア材料。
〔5〕 前記紙製バリア材料の少なくとも片面にポリオレフィン系樹脂を主成分としたラミネート層が設けられていることを特徴とする〔1〕~〔4〕のいずれか一項に記載の紙製バリア材料。
〔6〕 前記ラミネート層が、押し出しラミネート層あるいはドライラミネート層であることを特徴とする〔5〕に記載の紙製バリア材料。
[7] 前記紙製バリア材料の少なくとも一方の面にバリアフィルムが貼合されていることを特徴とする[1]~[4]のいずれか一項に記載の紙製バリア材料。
[8] 前記バリアフィルムが蒸着フィルムであることを特徴とする[7]に記載の紙製バリア材料。
[9] [1]~[8]に記載の紙製バリア材料を包装用途に使用する紙製バリア包装材料。
[10] 紙基材上に、水蒸気バリア層、ガスバリア層がこの順で設けられた紙製バリア材料において、前記水蒸気バリア層が水蒸気バリア性樹脂及び撥水剤を含有し、且つ前記ガスバリア層が水溶性高分子及び界面活性剤を含有する紙製バリア材料の少なくとも片面にポリオレフィン系樹脂を主成分としたラミネート層を設けた紙製バリア材料の製造方法であって、前記ラミネート層が、溶融押し出しラミネート法あるいはドライラミネート法によって設けられることを特徴とする紙製バリア材料の製造方法。
[11] 前記ガスバリア層が水系塗料の塗工によって設けられることを特徴とする[10]に記載の紙製バリア材料の製造方法。
本発明において紙基材とは、パルプ、填料、各種助剤からなるシートである。パルプとしては、広葉樹漂白クラフトパルプ(LBKP)、針葉樹漂白クラフトパルプ(NBKP)、サルファイトパルプ(SP)などの化学パルプ、ストーングラインドパルプ(SGP)、サーモメカニカルパルプ(TMP)、ケミサーモメカニカルパルプ(CTMP)などの機械パルプ、脱墨パルプ(DIP)、ケナフ、竹、麻などから得られた非木材繊維など用いることができ、これらを適宜配合して用いることが可能である。これらの中でも、原紙中への異物混入が発生し難い、使用後の紙容器を古紙原料に供してリサイクル使用する際に経時変色が発生し難い、高い白色度を有するため印刷時の面感が良好となり包装材料として使用した場合の使用価値が高くなるなどの理由から化学パルプを用いることが好ましく、広葉樹漂白クラフトパルプ(LBKP)、針葉樹漂白クラフトパルプ(NBKP)を用いることがより好ましい。
本発明の紙製バリア材料において、水蒸気バリア層に水蒸気バリア性樹脂、及び撥水剤が含有されていることが重要である。
本発明において、ガスバリア層に使用される水溶性高分子としては、完全ケン化ポリビニルアルコール、部分ケン化ポリビニルアルコール、エチレン共重合ポリビニルアルコール、ポリビニルピロリドン、デンプン、メチルセルロース、カルボキシメチルセルロース、アルギン酸ナトリウムなどを例示することができる。これらの中では、ガスバリア性の点から、ポリビニルアルコール、カルボキシメチルセルロースが好ましく、ポリビニルアルコールが更に好ましい。
なお、水蒸気バリア層表面の濡れ張力に対して塗料の表面張力を±20mN/mとすることが、水蒸気バリア層とガスバリア層との密着性の観点から好ましい。
本発明において、水蒸気バリア層、ガスバリア層の塗工方法については特に限定されるものではなく、公知の塗工装置を用いることができる。例えば、ブレードコーター、バーコーター、ロールコーター、エアナイフコーター、リバースロールコーター、カーテンコーター、スプレーコーター、サイズプレスコーター、ゲートロールコーターなどが挙げられる。また、塗工層を乾燥させる手法としては、例えば、蒸気加熱ヒーター、ガスヒーター、赤外線ヒーター、電気ヒーター、熱風加熱ヒーター、マイクロウェーブ、シリンダードライヤー等の通常の方法が用いられる。
本発明において、紙基材上に水蒸気バリア層、ガスバリア層を設けた紙製バリア材料の少なくとも一方の面に、ポリエチレン、ポリプロピレン、ポリ酢酸ビニル重合体、生物由来フィルム、生分解性フィルムなどのラミネート層を設けることができる。本発明において生物由来フィルムとは、発酵法で得られるプロパンジオールと化石資源由来のテレフタル酸のポリエステル(PTT)、大豆ポリオール、ポリウレタンなどの生分解性を有しないバイオプラスチックが挙げられ、生分解性フィルムは、生分解性を有するポリ乳酸(PLA)、澱粉樹脂、ポリヒドロキシアルカノエートなどのバイオプラスチックが挙げられる。包装材料として使用する際は、ポリエチレン、ポリプロピレンなどのポリオレフィン系樹脂を主体とすることが、包装材料としての内容物の保護やヒートシールの容易さといった点から好ましい。また、目的に応じてこれらのラミネート層を1層または複数層を設けることができる。
また、本発明の紙製バリア材料の少なくとも一方の面にバリアフィルムを貼合することもできる。バリアフィルムを貼合することによって、高湿度雰囲気下において優れたガス(酸素)バリア性が発現する。貼合するバリアフィルムは、特に制限されるものではなく、アルミニウム等の金属からなる金属箔、アルミニウム等の各種金属を蒸着させた蒸着フィルム、ポリビニルアルコール、エチレン-ビニルアルコール共重合体、ポリ塩化ビニリデン、ポリアクリロニトリル等の樹脂を主成分としたフィルム、あるいは、これらの樹脂をコーティングしたフィルム、更に酸化珪素や酸化アルミニウム等の無機酸化物を蒸着したセラミック蒸着フィルム等を例示することができる。これらのバリアフィルムの中では、アルミニウム等の各種金属を蒸着させた蒸着フィルム、あるいは無機酸化物を蒸着したセラミック蒸着フィルムが好ましい。また、目的に応じてこれらのフィルムを1層または複数層を貼合することができる。
本発明の紙製バリア材料は、包装材、容器、カップ等の包装用途に用いられる紙製バリア包装材料に好適に使用することができる。
本発明の紙製バリア材料は、紙製バリア材料のまま、あるいは各種汎用フィルム、バリアフィルム、アルミ箔等と積層して、食品などの包装材または容器やカップ、または産業用資材などに用いる積層体とすることができる。食品向け包装材として用いる場合は、ヒートシール性を有する樹脂と積層することにより、包装資材としての密閉性を高め、内容物を酸素による酸化や湿気などによる劣化などから守り、保存期間の延長を可能にすることができる。
また、産業用資材として使用する場合においても、酸素や湿気の侵入を抑えることで、腐敗、劣化を防止できるほか、溶剤の臭気が漏れ出るのを防止するフレーバーバリア性などの効果が期待される。
(1)水蒸気透過度:温度40±0.5℃、相対湿度90±2%の条件下で、透湿度測定器(Dr.Lyssy社製、L80-4000)を用いて測定した。なお、ラミネート層を形成させる前の紙製バリア材料を用いて測定した。
(3)表面張力:自動表面張力計(協和界面科学社製、DY-300)を使用し、23℃条件で測定した。
(4)濡れ張力:濡れ張力試験用混合液(株式会社和光純薬製、ぬれ張力試験用混合液)を用いて、JIS K 6768に記載のとおり試験を行い、ぬれ張力(mN/m=N/mm)を測定した。
(紙基材の作製)
カナダ式標準ろ水度(CSF)500mlの広葉樹クラフトパルプ(LBKP)とCSF530mlの針葉樹クラフトパルプ(NBKP)を80/20の重量比で配合して、原料パルプとした。原料パルプスラリーに、乾燥紙力増強剤として分子量250万のポリアクリルアミド(PAM)を対絶乾パルプ重量あたり0.1%、サイズ剤としてアルキルケテンダイマー(AKD)を対絶乾パルプ重量あたり0.35%、湿潤紙力増強剤としてポリアミドエピクロロヒドリン(PAEH)系樹脂を対絶乾パルプ重量あたり0.15%、さらに歩留剤として分子量1000万のポリアクリルアミド(PAM)を対絶乾パルプ重量あたり0.08%添加した後、デュオフォーマーFM型抄紙機にて300m/minの速度で抄紙し、坪量59g/m2の紙を得た。次いで、得られた紙に固形分濃度2%に調製したポリビニルアルコール(クラレ社製PVA117)をロッドメタリングサイズプレスで、両面に1.0g/m2塗工、乾燥し、坪量60g/m2の原紙を得た。得られた原紙をチルドカレンダーを用いて、速度300min/m、線圧50kgf/cm 1パスにて平滑処理を行った。
無機顔料である大粒径エンジニアードカオリン(イメリス社製、製品名:バリサーフHX 粒子径9.0μm アスペクト比80~100)に分散剤としてポリアクリル酸ソーダを添加し(対無機顔料0.2部)、セリエミキサーで分散して固形分濃度60%の大粒径カオリンスラリーを調製した。得られたカオリンスラリー中に水蒸気バリア性樹脂としてスチレン・アクリル系共重合体エマルジョン(サイデン化学社製、製品名:X-511-374E)を無機顔料100部に対して100部(固形分)となるように配合し、更にパラフィン系撥水剤(丸芳化学社製、製品名:MYE―35G、ワックス含有ポリエチレンエマルジョン)を無機顔料100部に対して、100部(固形分)となるように配合し、固形分濃度45%の塗工液Aを得た。
水溶性高分子であるポリビニルアルコール(クラレ社製、製品名:PVA117)を固形分濃度10%となるよう調製し、得られたポリビニルアルコール溶液中にシリコーン系界面活性剤(サンノプコ社製、製品名:SNウェット125)をポリビニルアルコール100部に対して1部(固形分)となるように配合し、塗工液Bを得た。なお、塗工液Bの表面張力は40mN/mであった。
得られた原紙上に塗工液Aを塗工量(乾燥)15g/m2となるよう塗工速度300m/minでブレードコーターを用いて片面塗工、乾燥した後、その上に塗工液Bを塗工量(乾燥)5.0g/m2となるよう塗工速度300m/minでロールコーターを用いて片面塗工し、紙製バリア材料を得た。なお、水蒸気バリア層表面の濡れ張力は40mN/mであった。
ガスバリア層用塗工液において配合する界面活性剤をアセチレンジオール系界面活性剤(日信化学工業社製、製品名:サーフィノールPSA-336)に変更した以外は実施例1と同様にして紙製バリア材料を得た。なお、ガスバリア層用塗工液の表面張力は30mN/mであった。
ガスバリア層用塗工液において配合する界面活性剤をアセチレンジオール系界面活性剤(日信化学工業社製、製品名:サーフィノールPSA-336)をポリビニルアルコール100部に対して1.5部(固形分)となるように配合することに変更した以外は実施例1と同様にして紙製バリア材料を得た。なお、ガスバリア層用塗工液の表面張力は25mN/mであった。
ガスバリア層用塗工液において配合する界面活性剤をアルキルスルホン酸系界面活性剤(日本乳化剤社製、製品名:Newcol-291-M)に変更した以外は実施例1と同様にして紙製バリア材料を得た。なお、ガスバリア層用塗工液の表面張力は45mN/mであった。
水蒸気バリア層用塗工液の調製において、撥水剤をパラフィン系撥水剤(星光PMC社製、製品名:WR3900、パラフィンワックスエマルジョン)に変更した以外は実施例1と同様にして紙製バリア材料を得た。なお、水蒸気バリア層表面の濡れ張力は35mN/mであった。
水蒸気バリア層用塗工液の調製において、撥水剤を天然油脂系撥水剤(互応化学工業社製、製品名:KW―606、カルナバワックスエマルジョン)に変更した以外は実施例1と同様にして紙製バリア材料を得た。なお、水蒸気バリア層表面の濡れ張力は50mN/mであった。
実施例1にて得られた紙製バリア材料の両面に共押出しラミネートにより、低密度ポリエチレン(日本ポリエチレン社製、製品名:LC602A)をそれぞれ厚み30μm積層した以外は実施例1と同様にして紙製バリア材料を得た。
実施例1にて得られた紙製バリア材料のバリア面上にドライラミネートにより直鎖状低密度ポリエチレンフィルム(フタムラ化学社製、製品名:LL-XMTN、20μm厚)を積層し、非バリア面上(原紙面上)にドライラミネートにより二軸延伸ポリプロピレンフィルム(フタムラ化学社製、製品名:FOA、20μm厚)を積層した以外は実施例1と同様にして紙製バリア材料を得た。
実施例1にて得られた紙製バリア材料のバリア面上にアルミ蒸着PETフィルム(中井工業社製、製品名:MY-15)をドライラミネート法にて貼合した以外は実施例1と同様にして紙製バリア材料を得た。
実施例2にて得られた紙製バリア材料のバリア面上にアルミ蒸着PETフィルム(中井工業社製、製品名:MY-15)をドライラミネート法にて貼合した以外は実施例1と同様にして紙製バリア材料を得た。
実施例1にて得られた紙製バリア材料のバリア面上にアルミナ(セラミック)蒸着PETフィルム(凸版印刷社製、製品名:GL-ARH-F)をドライラミネート法にて貼合した以外は実施例1と同様にして紙製バリア材料を得た。
実施例1にて得られた紙製バリア材料のバリア面上にEVOHフィルム(クラレ社製、製品名:エバールフィルム EF-XL)をドライラミネート法にて貼合した以外は実施例1と同様にして紙製バリア材料を得た。
紙基材をカップ原紙(坪量270g/m2)に変更した以外は、実施例1と同様にして紙製バリア材料を得た。さらに、得られた紙製バリア材料のバリア面上にアルミ蒸着PETフィルム(中井工業社製、製品名:MY-15)をドライラミネート法にて貼合した以外は実施例1と同様にして紙製バリア材料を得た。
水蒸気バリア層用塗工液の調製においてパラフィン系撥水剤の配合量を無機顔料100部に対して、100部(固形分)から500部(固形分)に変更し、ガスバリア層用塗工液において配合するシリコーン系界面活性剤の配合量をポリビニルアルコール100部に対して1部(固形分)から5部(固形分)となるよう変更した以外は実施例1と同様にして紙製バリア材料を得た。なお、水蒸気バリア層表面の濡れ張力は20mN/m、このガスバリア層用塗工液の表面張力は20mN/mであった。
水蒸気バリア層用塗工液の調製においてパラフィン系撥水剤の配合量を無機顔料100部に対して、100部(固形分)から1000部(固形分)に変更し、ガスバリア層用塗工液において配合するシリコーン系界面活性剤の配合量をポリビニルアルコール100部に対して1部(固形分)から8部(固形分)となるよう変更した以外は実施例1と同様にして紙製バリア材料を得た。なお、水蒸気バリア層表面の濡れ張力は15mN/m、このガスバリア層用塗工液の表面張力は15mN/mであった。
水蒸気バリア層用塗工液の調製においてパラフィン系撥水剤の配合量を無機顔料100部に対して、100部(固形分)から500部(固形分)に変更し、ガスバリア層用塗工液において配合する界面活性剤をアセチレンジオール系界面活性剤(日信化学工業社製、製品名:サーフィノールPSA-336)に変更し、配合量をポリビニルアルコール100部に対して1部(固形分)から5部(固形分)となるよう変更した以外は実施例2と同様にして紙製バリア材料を得た。なお、水蒸気バリア層表面の濡れ張力は20mN/m、このガスバリア層用塗工液の表面張力は20mN/mであった。
水蒸気バリア層用塗工液の調製において撥水剤をパラフィン系撥水剤(星光PMC社製、製品名:WR3900、パラフィンワックスエマルジョン)に変更し、配合量を無機顔料100部に対して、100部(固形分)から500部(固形分)に変更し、ガスバリア層用塗工液において配合するシリコーン系界面活性剤の配合量をポリビニルアルコール100部に対して1部(固形分)から5部(固形分)となるよう変更した以外は実施例1と同様にして紙製バリア材料を得た。なお、水蒸気バリア層表面の濡れ張力は25mN/m、このガスバリア層用塗工液の表面張力は20mN/mであった。
紙基材にガスバリア層、水蒸気バリア層をこの順に設けた以外は実施例1と同様にして紙製バリア材料を得た。
ガスバリア層用塗工液に界面活性剤を配合しなかった以外は実施例1と同様にして紙製バリア材料を得た。
水蒸気バリア層を設けなかった以外は実施例1と同様にして紙製バリア材料を得た。
ガスバリア層を設けなかった以外は実施例1と同様にして紙製バリア材料を得た。
Claims (11)
- 紙基材上に、水蒸気バリア層、ガスバリア層がこの順で設けられた紙製バリア材料において、前記水蒸気バリア層が水蒸気バリア性樹脂及び撥水剤を含有し、且つ前記ガスバリア層が水溶性高分子及び界面活性剤を含有することを特徴とする紙製バリア材料。
- 前記水溶性高分子が、ポリビニルアルコールであることを特徴とする請求項1に記載の紙製バリア材料。
- 前記界面活性剤が、アセチレンジオール系界面活性剤であることを特徴とする請求項1又は請求項2に記載の紙製バリア材料。
- 前記水蒸気バリア層の濡れ張力とガスバリア層を形成させる塗料の表面張力の差が、±20mN/mであることを特徴とする請求項1~3のいずれか一項に記載の紙製バリア材料。
- 前記紙製バリア材料の少なくとも片面にポリオレフィン系樹脂を主成分としたラミネート層が設けられていることを特徴とする請求項1~4のいずれか一項に記載の紙製バリア材料。
- 前記ラミネート層が、押し出しラミネート層あるいはドライラミネート層であることを特徴とする請求項5に記載の紙製バリア材料。
- 前記紙製バリア材料の少なくとも一方の面にバリアフィルムが貼合されていることを特徴とする請求項1~4のいずれか一項に記載の紙製バリア材料。
- 前記バリアフィルムが蒸着フィルムであることを特徴とする請求項7に記載の紙製バリア材料。
- 請求項1~8に記載の紙製バリア材料を包装用途に使用する紙製バリア包装材料。
- 紙基材上に、水蒸気バリア層、ガスバリア層がこの順で設けられた紙製バリア材料において、前記水蒸気バリア層が水蒸気バリア性樹脂及び撥水剤を含有し、且つ前記ガスバリア層が水溶性高分子及び界面活性剤を含有する紙製バリア材料の少なくとも片面にポリオレフィン系樹脂を主成分としたラミネート層を設けた紙製バリア材料の製造方法であって、前記ラミネート層が、溶融押し出しラミネート法あるいはドライラミネート法によって設けられることを特徴とする紙製バリア材料の製造方法。
- 前記ガスバリア層が水系塗料の塗工によって設けられることを特徴とする請求項10に記載の紙製バリア材料の製造方法。
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Also Published As
Publication number | Publication date |
---|---|
EP3437860A4 (en) | 2019-09-18 |
JP6234654B1 (ja) | 2017-11-22 |
CN109070563B (zh) | 2022-05-03 |
EP3437860A1 (en) | 2019-02-06 |
EP3437860B1 (en) | 2021-06-09 |
KR20180126516A (ko) | 2018-11-27 |
AU2017244605A1 (en) | 2018-11-15 |
CN109070563A (zh) | 2018-12-21 |
US20190270289A1 (en) | 2019-09-05 |
JPWO2017170462A1 (ja) | 2018-04-05 |
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