WO2021095708A1 - Papier multicouche, et procédé de fabrication de celui-ci - Google Patents

Papier multicouche, et procédé de fabrication de celui-ci Download PDF

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Publication number
WO2021095708A1
WO2021095708A1 PCT/JP2020/041828 JP2020041828W WO2021095708A1 WO 2021095708 A1 WO2021095708 A1 WO 2021095708A1 JP 2020041828 W JP2020041828 W JP 2020041828W WO 2021095708 A1 WO2021095708 A1 WO 2021095708A1
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WIPO (PCT)
Prior art keywords
pulp
paper
multilayer paper
layer
middle layer
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PCT/JP2020/041828
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English (en)
Japanese (ja)
Inventor
公人 関
和美 峯村
Original Assignee
大王製紙株式会社
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Application filed by 大王製紙株式会社 filed Critical 大王製紙株式会社
Priority to CN202080073977.XA priority Critical patent/CN114630938B/zh
Priority to KR1020227014039A priority patent/KR20220069090A/ko
Publication of WO2021095708A1 publication Critical patent/WO2021095708A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • D21H27/40—Multi-ply at least one of the sheets being non-planar, e.g. crêped
    • 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
    • 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
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B29/005—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to another layer of paper or cardboard layer
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/022—Mechanical properties
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/06—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the cylinder type
    • D21F11/08—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the cylinder type paper or board consisting of two or more layers
    • 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
    • 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
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10—Organic non-cellulose fibres
    • D21H13/12—Organic non-cellulose fibres from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/18—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylonitriles
    • 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
    • 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
    • D21H21/18—Reinforcing agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/26—All layers being made of paper or paperboard
    • 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
    • B32B2307/546—Flexural strength; Flexion stiffness
    • 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
    • B32B2479/00—Furniture
    • 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
    • B32B2535/00—Medical equipment, e.g. bandage, prostheses, catheter

Definitions

  • the present invention relates to a multilayer paper and a method for producing the same.
  • the main object of the present invention is to provide a multilayer paper having a sufficient thickness and exhibiting sufficient strength and the like.
  • the multilayer paper of the present invention that solves the above problems is It has a plurality of middle layers and a pair of surface layers formed on the front and back surfaces of the middle layer.
  • the surface and middle layers of pulp contain 80% or more of softwood kraft pulp and hardwood kraft pulp.
  • the middle layer is 3 to 7 layers.
  • the total intermediate basis weight 600 ⁇ 950g / m 2 the basis weight of the surface layer is 75 ⁇ 260g / m 2, a basis weight of entire multilayer sheet 750 ⁇ 1470g / m 2, it is characterized.
  • the middle layer is 3 to 7 layers, and the pair of surface layers are combined to form a 5 to 9 layer structure, and the basis weight of each layer is increased, so that the total basis weight is 750 to 1470 g / m 2.
  • This multilayer paper has excellent strength characteristics such as bending strength.
  • the object can be obtained from a single sheet of thick paper instead of the laminated structure, which is advantageous in cost and productivity.
  • the manufacturing method of multilayer paper is In manufacturing a multilayer paper having a middle layer of a plurality of layers and a pair of surface layers formed on the front and back surfaces of the middle layer.
  • a surface pulp raw material having a pulp freeness of 375 to 465 ml and a middle layer pulp raw material having a pulp freeness of 460 to 550 ml Using a circular net multi-cylinder paper machine that performs 5 to 7 layers, the basis weight of the entire middle layer is 600 to 950 g / m 2 , and the basis weight of each surface layer is 75 to 260 g / m. 2. It is characterized in that the basis weight of the entire multilayer paper is 750 to 1470 g / m 2.
  • the above-mentioned circular net multi-cylinder paper machine is a paper machine that makes thick paper by rotating a cylinder with a wire in a tank to form a fiber layer by the pressure difference of water. This is a continuous configuration of circular net paper machines. "Making together” is the stacking of wet paper before drying.
  • Thick paper can be easily obtained by making paper with a circular net multi-cylinder paper machine that makes 5 to 9 layers. With thick paper, there is a concern that partial wrinkles may occur in the papermaking process, for example, due to a calendar roll. On the other hand, if the pulp freeness of the pulp raw material for the surface layer is set lower than the pulp freeness of the pulp raw material for the middle layer, for example, the pressing force by the calender roll will be dispersed without being concentrated, so that it is partially on the surface. The occurrence of wrinkles (also referred to as "handling wrinkles" because they are similar to wrinkles that occur when paper is handled by hand) can be suppressed. As a result, the appearance is improved, and it becomes easy to obtain an object from a single piece of cardboard.
  • the multilayer paper has a plurality of layers of middle layers and a pair of surface layers formed on the front and back surfaces of the middle layers.
  • the middle layer is 3 to 7 layers.
  • Examples of the use of this multilayer paper include “tableware”, “medical equipment”, “furniture”, and “stationery”.
  • tableware is a broad concept that includes not only tableware such as plates, bowls, chopsticks, cups, coasters, trays, madlers, spoons, forks, and paper knives, but also cooking utensils such as knives and kitchen knives.
  • Medical devices may include tongue depressors, earpicks, combs, kidney dishes, and other alternatives to current plastic medical devices.
  • “Furniture” may include hangers and other alternatives to current plastic furniture.
  • “Stationery” may include alternatives to other current plastic stationery such as clearboards, clips, pens, etc.
  • the surface and middle layers of pulp contain 80% or more of softwood kraft pulp and hardwood kraft pulp. Preferably, it does not contain recycled pulp. If the waste paper pulp is excessively contained, the strength is lowered, but if the upper limit is 20% by mass, the influence on the strength is small.
  • the paper thickness becomes thicker, and sufficient strength can be secured.
  • the mass ratio (%) of the softwood kraft pulp to the hardwood kraft pulp in the surface layer is set to 5/95 or more and 40/60 or less, a large amount of hardwood kraft pulp that is relatively rigid and easily densified is contained.
  • the pair of surface layers can obtain high-density and rigid characteristics and are excellent in strength. Further, the surface layer can enhance the effect of suppressing the penetration of water or oil components derived from an object such as food into the inside.
  • the mass ratio (%) of the softwood kraft pulp to the hardwood kraft pulp in the middle layer is 20/80 or more and 40/60 or less, a large amount of highly flexible softwood kraft pulp is contained, so that the middle layer is good. Flexible.
  • the softwood kraft pulp is, for example, softwood unbleached kraft pulp (NUKP), softwood semi-bleached kraft pulp (NSBKP), and softwood bleached kraft pulp (NBKP).
  • the hardwood kraft pulp is, for example, hardwood unbleached kraft pulp (LUKP), hardwood semi-bleached kraft pulp (LSBKP), and hardwood bleached kraft pulp (LBKP).
  • LKP hardwood unbleached kraft pulp
  • LSBKP hardwood semi-bleached kraft pulp
  • LLKP hardwood bleached kraft pulp
  • Each layer of the multilayer paper may be, for example, chemical pulp such as broadleaf sulfite pulp or coniferous sulfite pulp, or pulp chemically or mechanically produced from non-wood fibers such as kenaf, hemp, and reed.
  • chemical pulp such as broadleaf sulfite pulp or coniferous sulfite pulp
  • pulp chemically or mechanically produced from non-wood fibers such as kenaf, hemp, and reed.
  • non-wood fibers such as kenaf, hemp, and reed.
  • the multilayer paper of the embodiment is one that comes into direct contact with an object such as food when used for, for example, paper tableware. Therefore, the other pulp used for the multilayer paper is preferably chemical pulp, and more preferably ECF pulp, TCF pulp, and unbleached kraft pulp (UKP).
  • ECF pulp is a chlorine-free bleached chemical pulp produced by bleaching with chlorine dioxide (ClO 2 ) without using chlorine
  • the TCF pulp is a completely chlorine-free bleached chemical pulp produced by bleaching with oxygen (O), hydrogen peroxide (P), and ozone (Z) without using chlorine (Cl 2). That is, since ECF pulp and TCF pulp have a trace amount or 0 chlorine ion content, they have an advantage that there is little risk of producing organic chlorine compounds such as dioxins even by low-temperature incineration, resulting in an environmental load. Can be reduced. In addition, unbleached kraft pulp can be used to resemble the color of wood, and by omitting the bleaching process, it is possible to reduce the environmental load such as energy reduction and CO 2 reduction.
  • the multi-layer paper of the embodiment has a multi-layered structure in which a pair of surface layers having a characteristic of being hard and hard to break and a middle layer having flexibility are combined to ensure elasticity while maintaining high density of the surface layer, while causing distortion and distortion. Breakage can be suppressed.
  • the multilayer paper of the embodiment preferably has 375 ml, particularly 410 ml, as the lower limit of the Canadian Standard Freeness (CSF) of the pulp used for the surface layer.
  • CSF Canadian Standard Freeness
  • the upper limit of the CSF of the pulp used for the surface layer is 465 ml, particularly 450 ml.
  • the multilayer paper can be made thicker and more rigid by mixing and blending softwood bleached kraft pulp and hardwood bleached kraft pulp having high freeness.
  • CSF Canadian Standard Freeness
  • the middle layer is mainly composed of softwood kraft pulp and hardwood kraft pulp.
  • the mass ratio (%) of the softwood bleached kraft pulp and the hardwood kraft pulp in the middle layer is 30/70 or more and 40/60 or less.
  • the lower limit of the Canadian Standard Freeness (CSF) of the pulp used for the middle layer of the multilayer paper of the embodiment is preferably 460 ml, particularly 470 ml.
  • the upper limit of the CSF of the pulp used in the middle layer is preferably 550 ml, particularly 520 ml. If the CSF is excessively high, there is little fibrillation, which may lead to a decrease in strength and interlayer strength. Further, it is preferable that the Canadian standard freeness of the pulp used for the middle layer is higher than the Canadian standard freeness of the pulp used for the pair of surface layers from the viewpoint of ensuring the elastic force while maintaining the interlayer strength of the middle layer.
  • the total number of the middle layers is preferably 3 or more, particularly 5 layers. When the total number of the middle layers is three or more, the toughness and durability of the multilayer paper can be further improved.
  • the upper limit of the total number of the middle layers is preferably 7 layers or less from the viewpoint of maintaining the interlayer strength. When using a circular net multi-cylinder paper machine, 3 to 7 layers are suitable for operation while maintaining the interlayer strength.
  • a sizing agent can be added to each layer of the multilayer paper in order to further suppress the penetration of water or oil components derived from an object such as food into the inside.
  • the sizing agent include a styrene-based sizing agent, an alkyl keten dimer (AKD), an alkenyl succinic anhydride (ASA), a neutral rosin sizing agent, a rosin sizing agent, and a modified rosin emulsion sizing agent.
  • a rosin sizing agent and a modified rosin emulsion sizing agent are preferable.
  • the rosin sizing agent is conventionally known in the paper manufacturing field and is not particularly limited.
  • the rosin-based substance include fortified rosins obtained by modifying rosins such as gum rosin, wood rosin and tall oil rosin with ⁇ , ⁇ -unsaturated carboxylic acids such as fumaric acid, maleic acid and acrylic acid or their anhydrides.
  • rosin esters obtained by reacting rosins with polyhydric alcohols such as glycerin, trimethylolethane, trimethylolpropane, pentaerythritol, and diglycerin can be mentioned.
  • the rosin-based sizing agent includes those obtained by emulsifying these alone or a mixture thereof, and those obtained by emulsifying alone and then mixing them. Further, the emulsified product to which various polymers are added in order to further improve the size expression is also included.
  • the amount of the sizing agent added to the surface layer is preferably 0.5 kg / t or more and 5.0 kg / t or less in terms of solid content.
  • the amount of the sizing agent added to the middle layer is preferably 2.0 kg / t or more and 5.0 kg / t or less in terms of solid content.
  • "kg / t" indicates the mass (kg) per 1 ton of pulp. Water resistance can be improved by setting the amount of the sizing agent added within the above range.
  • Paper power enhancer A paper strength enhancer sizing agent can be added to each layer of the multilayer paper. By adding a paper strength enhancer, various strengths suitable for use as paper tableware can be imparted to each layer.
  • the paper strength enhancer various known ones such as polyacrylamide resin, polyamide resin, polyamine resin, acrylic resin, melamine resin, urea resin, and polyamide epichlorohydrin resin can be used. Among these, it is preferable to use an amphoteric paper strength enhancer.
  • amphoteric polyacrylamide include a copolymer of acrylamide and the anionic monomer and the cationic monomer, a Mannig modified product of a copolymer of acrylamide and the anionic monomer, and a Hofmann decomposition product.
  • amphoteric polyacrylamide is particularly preferable, and since amphoteric polyacrylamide has a self-fixing function, even if it is added to improve the inter-paper strength, there is no excess of cations. , The modified rosin emulsion sizing agent can be stably fixed.
  • the amount of the paper strength enhancer added to each layer is preferably 12 kg / t or more and 30 kg / t or less in terms of solid content.
  • various paper strengths such as interlayer strength of multilayer paper can be imparted. If the amount of the paper strength enhancer added is less than the above range, the interlayer strength may not be sufficient.
  • the amount of the paper strength enhancer added exceeds the above range, the improvement of the interlayer strength becomes almost flat, and further, the yield of the added paper strength enhancer decreases, so that stains and foaming in the paper machine system are caused. It may occur and the operability (deterioration of dehydration) may decrease. As a result, delamination may occur due to poor drying in the drying process.
  • the multilayer paper may contain various other papermaking additives as long as the effects intended by the present invention are not impaired.
  • examples of other additives that can be added to the multilayer paper include known paper-making chemicals.
  • Basis weight is measured according to JIS-P8124 (2011).
  • the basis weight of each layer of the multilayer paper does not have to be equal, and the basis weight of the surface layer and the middle layer is not particularly limited, but the basis weight of the surface layer is 75.0 g / m 2 or more per layer. It is preferably 260.0 g / m 2 or less.
  • As the basis weight of the entire middle 600 g / m 2 or more 950 g / m 2 or less.
  • the lower limit of the basis weight of the entire multilayer paper is preferably 750 g / m 2 and more preferably 860 g / m 2 from the viewpoint of obtaining sufficient rigidity.
  • the upper limit of the basis weight of the entire multilayer sheet is preferably 1470 g / m 2, and more preferably 1240 g / m 2. If the basis weight is high, it is easy to obtain sufficient rigidity, but the thickness is increased and there is a possibility that the calendar roll is likely to break and wrinkle during papermaking.
  • the ratio of the total basis weight of the pair of surface layers to the basis weight of the entire multilayer paper is preferably 25.0% or more and 35.0% or less.
  • the property of being hard to bend can be imparted by setting the ratio of the total basis weight of the pair of surface layers to the above range.
  • Paper thickness Paper thickness is measured in accordance with "Paper and Paperboard-Thickness and Density Test Method" described in JIS-P8118 (2014).
  • the thickness of the multilayer paper is preferably 750 ⁇ m or more and 2,000 ⁇ m or less. When the paper thickness of the multilayer paper is within the above range, peeling of the paper layer of the multilayer paper can be suppressed.
  • the density of the multilayer paper is preferably 0.65 to 1.00 g / cm 3 , particularly 0.73 to 0.85 g / cm 3.
  • the density of the multilayer paper is within the above range, the contradictory performances of high basis weight, excellent rigidity, and resistance to breakage are exhibited.
  • the density of the multilayer paper is less than 0.65 g / cm 3, although bending strength is obtained, handling wrinkles and delamination may easily occur.
  • the density of the multilayer paper exceeds 1.00 g / cm 3 , handling wrinkles and delamination are unlikely to occur, but the strength and rigidity may decrease.
  • the density of the multilayer paper can be adjusted by the pulp freeness and ash content of the surface layer or the middle layer, and the calendar process.
  • the moisture content of the multilayer paper measured in accordance with JIS-P8127 (2010) is preferably 9.0% or more and 11.0% or less.
  • the flexibility is improved, so that the workability of the folding machine and the effect of suppressing tearing of the folded portion can be improved when the tableware is manufactured using the multilayer paper.
  • the ash content is measured according to JIS-P8251 (2003).
  • the ash content of the multilayer paper is preferably 0.1% or more and 10.0% or less. When the ash content of the multilayer paper is within the above range, the curl can be adjusted flat and the decrease in interlayer strength can be suppressed.
  • the surface strength is determined by the Japan TAPPI pulp and paper test method No. Measured according to the "Surface Strength Test Method” according to 1 m-72. 10A is preferable as the lower limit of the surface strength of the multilayer paper. When the surface strength of the multilayer paper is within the above range, it is possible to improve the scratch resistance at the stage of dropping, transporting, and processing the surface layer.
  • the degree of bump size is measured using distilled water at 23 ° C. according to JIS-P8140 (1998).
  • the upper limit of the bump size of the multilayer paper is preferably 50 g / m 2. When the bump size of the multilayer paper is equal to or greater than the upper limit, the multilayer paper may cause wrinkles or wrinkles due to moisture absorption.
  • the Z-axis strength is determined by the Japan TAPPI pulp and paper test method No.
  • the Z-axis intensity measured according to 18-1: 2000 is preferably 380 kN / mm 2 or more. By having the Z-axis strength, it is possible to suppress delamination and wrinkles during tableware molding.
  • Bending strength is 10.0N or more, so when the tip is processed into sharp tableware, etc. No breaks occur.
  • the multilayer paper it has excellent toughness and durability, and can be suitably used for paper tableware that replaces conventional plastic tableware.
  • the method for producing the multilayer paper is not particularly limited, but for example, it can be produced using a known multilayer paper machine by the following steps. (1) Additives corresponding to each paper layer are added as necessary to the slurry obtained by dispersing pulp fibers in water and mixed to prepare a paper material for each paper layer.
  • the surface layer, single layer or multi-layer middle layer and surface layer are assembled with a paper machine in the neutral range so that the pH of the multilayer paper is 6 or more and 8 or less.
  • Papermaking The paper making method is not particularly limited, and a known paper machine, that is, a paper machine such as a long net, a circular net, a hybrid former, or a gap former can be used, but a circular net multi-cylinder type paper machine is particularly preferable.
  • a paper machine paper is made in multiple layers of 5 or more layers.
  • a coating liquid such as a size press, a rod metering size press, and a gate roll coater can be used to apply a coating liquid to the surface of the surface layer to form a surface coating layer.
  • a dryer cylinder After drying, smoothing may be performed using a calender device such as a nip calender, a super calender, a machine calender, or a soft calender.
  • a calender device such as a nip calender, a super calender, a machine calender, or a soft calender.
  • the methods for measuring the physical property values of Examples and Comparative Examples are as follows. [Freeness (mL)] The obtained multilayer paper was made into disintegrated pulp by disintegrating the pulp in accordance with the method for disintegrating the pulp of JIS-P8220-1 (2012), and this disintegrated pulp was used as a Canadian standard freshness test of JIS-P8121-2 (2012). Measured according to the method.
  • the bending strength was measured with a digital force gauge (manufactured by Imada Co., Ltd.), and the test conditions were as follows. A test piece having a width of 15 mm and a length of 150 mm was fixed to a three-point bending jig, and the force gage was lowered. At that time, the load was defined as the bending strength (N). The test environment was a temperature of 26 ° C. and a humidity of 70%.
  • the tensile strength is a value measured according to JIS-P-8113 (2006).
  • Bending strength was measured according to JIS K7171: 2016. The test piece was prepared to have a width of 15 mm and a length of 150 mm.
  • Example 1 The composition of the surface layer and the middle layer is shown below.
  • surface The following raw materials were added to 100 parts of a pulp slurry having a freeness of 440 ml and an NBKP: LBKP of 10:90.
  • Rosin emulsion-based sizing agent 0.8 kg in solid content / pulp t
  • Acrylamide-based paper strength enhancer 19.0 kg in solid content / pulp t
  • the following raw materials were added to 100 parts of a pulp slurry having a freeness of 440 ml and an NBKP: LBKP of 35:65.
  • Modified rosin emulsion-based sizing agent 6.0 kg in solid content / pulp t
  • Acrylamide-based paper strength enhancer 19.0 kg in solid content / pulp t
  • This pulp slurry was made by using a circular net multi-cylinder paper machine with a wire part of a pair of surface layers and 5 middle layers in a total of 7 layers. The basis weight of each layer is as shown in Tables 1 and 2.
  • (3) A coating liquid containing polyvinyl alcohol and paraffin wax is calendar-coated on the surface of the surface layer so as to have the following coating amount to form a surface coating layer, and the multilayer paper of Example 1 is obtained. It was.
  • Polyvinyl alcohol 0.2 g / m 2
  • Paraffin wax 0.2 g / m 2
  • Surface sizing agent 0.6 g / m 2
  • Examples 2 to 7, Comparative Examples 1 to 5 and Reference Examples 1 to 4 are the same as in Example 1 except that the types, contents, and physical property values of the raw materials are as shown in Tables 1 and 2.
  • the multilayer papers of 1 to 4 of Reference Example 4 were obtained.
  • Comparative Example 4 is a multilayer paper formed only from the middle layer.
  • Reference Example 1 to Reference Example 4 are examples of multilayer paper in which pulp freeness is changed.
  • the multilayer paper of the present invention can be suitably used for paper tableware, paper medical instruments, paper furniture, and paper stationery.

Abstract

L'invention fournit un papier multicouche qui présente une épaisseur suffisante, et qui développe également une résistance, ou similaire, suffisante. Le papier multicouche de l'invention possède une pluralité de couches intermédiaires, et une paire de couches superficielles formée à l'avant et à l'arrière de ces couches intermédiaires. La pâte desdites couches superficielles et couches intermédiaires inclut 80% ou plus d'une pâte kraft de résineux et dune pâte kraft de feuillu. Plus précisément, l'invention concerne une matière de départ de pâte pour couche superficielle telle que l'égouttage de pâte desdites couches superficielles est compris entre ３７５ et ４６５ｍｌ, et un papier multicouche qui est tel que l'égouttage de pâte desdites couches intermédiaires est compris entre ４６０ et ５５０ｍｌ, lesdites couches intermédiaires sont au nombre de 3 à 7 couches, le grammage de l'ensemble desdites couches intermédiaires est compris entre ６００ et ９５０ｇ／ｍ2, le grammage de chacune desdites couches superficielles est compris entre ７５ et ２６０ｇ／ｍ2, et le grammage de l'ensemble du papier multicouche est compris entre ７５０ et １４７０ｇ／ｍ2.
PCT/JP2020/041828 2019-11-15 2020-11-10 Papier multicouche, et procédé de fabrication de celui-ci WO2021095708A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002046769A (ja) * 2001-04-24 2002-02-12 Hokuetsu Paper Mills Ltd 電子部品用キャリアテープ紙
JP2002179044A (ja) * 2000-10-03 2002-06-26 Oji Paper Co Ltd 紙製成形容器及びその製造方法
JP2008069462A (ja) * 2006-09-12 2008-03-27 Daio Paper Corp マドラー用紙
JP2014141773A (ja) * 2012-12-26 2014-08-07 Chuetsu Pulp Kogyo Kk 印刷用塗工紙
WO2020116465A1 (fr) * 2018-12-05 2020-06-11 大王製紙株式会社 Papier de revêtement pour la vaisselle

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JPS59102009A (ja) 1982-12-02 1984-06-12 Samu Denshi Kikai:Kk 原位置における動的地盤剪断試験の方法
JPH1136197A (ja) * 1997-07-16 1999-02-09 Tokushu Paper Mfg Co Ltd 化粧材用基紙、及びその製造方法、及びこれを使用した化粧材
JP4355283B2 (ja) 2004-12-17 2009-10-28 大王製紙株式会社 食器用紙からなる撹拌用スティック及びスプーン
JP6117133B2 (ja) * 2014-03-11 2017-04-19 北越紀州製紙株式会社 白板紙及びその製造方法
JP3220813U (ja) 2019-01-24 2019-04-04 有限会社柴田印刷 ハンガー

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002179044A (ja) * 2000-10-03 2002-06-26 Oji Paper Co Ltd 紙製成形容器及びその製造方法
JP2002046769A (ja) * 2001-04-24 2002-02-12 Hokuetsu Paper Mills Ltd 電子部品用キャリアテープ紙
JP2008069462A (ja) * 2006-09-12 2008-03-27 Daio Paper Corp マドラー用紙
JP2014141773A (ja) * 2012-12-26 2014-08-07 Chuetsu Pulp Kogyo Kk 印刷用塗工紙
WO2020116465A1 (fr) * 2018-12-05 2020-06-11 大王製紙株式会社 Papier de revêtement pour la vaisselle

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CN114630938B (zh) 2023-08-08
JP2021165458A (ja) 2021-10-14
TW202124166A (zh) 2021-07-01

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