WO2020153360A1 - Papier laminé, matériau de base pour papier laminé, récipient en papier, et procédé de production de papier laminé - Google Patents

Papier laminé, matériau de base pour papier laminé, récipient en papier, et procédé de production de papier laminé Download PDF

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Publication number
WO2020153360A1
WO2020153360A1 PCT/JP2020/001963 JP2020001963W WO2020153360A1 WO 2020153360 A1 WO2020153360 A1 WO 2020153360A1 JP 2020001963 W JP2020001963 W JP 2020001963W WO 2020153360 A1 WO2020153360 A1 WO 2020153360A1
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WIPO (PCT)
Prior art keywords
paper
base material
laminated
fatty acid
paper base
Prior art date
Application number
PCT/JP2020/001963
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English (en)
Japanese (ja)
Inventor
啓史 山中
正和 槌本
友美子 石川
Original Assignee
王子ホールディングス株式会社
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Publication of WO2020153360A1 publication Critical patent/WO2020153360A1/fr

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Classifications

    • 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
    • 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
    • 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
    • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
    • B65D5/42—Details of containers or of foldable or erectable container blanks
    • B65D5/56—Linings or internal coatings, e.g. pre-formed trays provided with a blow- or thermoformed layer
    • 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
    • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
    • B65D5/42—Details of containers or of foldable or erectable container blanks
    • B65D5/62—External coverings or coatings
    • 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
    • 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
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/06—Alcohols; Phenols; Ethers; Aldehydes; Ketones; Acetals; Ketals
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/14—Carboxylic acids; Derivatives thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • 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
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging

Definitions

  • the present invention relates to a laminated paper, a laminated paper paper base material, a paper container, and a laminated paper manufacturing method.
  • thermoplastic resin layer such as polyethylene to impart water resistance.
  • This type of liquid paper container is separated into a paper base material and a thermoplastic resin layer after use, the paper component is used as a waste paper raw material, and the thermoplastic resin layer of relatively high purity is RPF (Refuse Paper & Plastic). It may be recovered and used as a raw material for fuel (solid fuel) and recycled plastic.
  • RPF Refuse Paper & Plastic
  • Patent Document 1 an outermost layer made of an olefin resin, a paper base layer, an adhesion control layer, an adhesive resin layer, a barrier layer, a resin film layer, and a laminate having an innermost layer containing an olefin resin are formed.
  • a liquid paper container in which at least the outermost layer and the paper base material layer are separated from the barrier layer in the region between the strip-shaped separator and the body score line.
  • Patent Document 2 there is an opportunity for impregnating a paper layer at a side edge portion of a top forming plate of a gable top type container with a paper strengthening agent to separate the paper-based layer from the plastic-based layer.
  • a liquid paper container having a structure that is easy to make is disclosed.
  • JP 2012-166796 A Japanese Patent Laid-Open No. 2000-185729
  • the liquid paper container of Patent Document 1 is a liquid paper container in which the paper base material layer and the barrier layer can be easily peeled off, but it is composed of a number of layers and is cut to improve the peelability. There was room for improvement in sex and the like.
  • the liquid paper container of Patent Document 2 is also a liquid paper container provided with a location that serves as a trigger when the layer mainly containing paper and the layer mainly containing plastic are peeled off.
  • the point that triggers this is only a part of the paper container, and most of the part of the paper container remains firmly bonded, so there was room for improvement in terms of recyclability and the like.
  • an object of the present invention is to provide a laminated paper in which the paper base material and the thermoplastic resin layer can be easily peeled off and the raw material can be easily recycled, the laminated paper paper base material, and a paper using the laminated paper.
  • a container and a method for manufacturing the laminated paper are provided.
  • the present inventors advanced the study on a paper base material containing a specific amount of a specific linear fatty acid or linear alcohol.
  • the paper base material containing a predetermined amount of a specific type of linear fatty acid or linear alcohol firmly adheres to the thermoplastic resin layer during production, but thereafter, the paper base material and the thermoplastic resin layer It has been found that peeling becomes easy.
  • the present invention has been completed based on these findings. That is, the present invention has the following configurations.
  • a laminated paper having a paper base material containing cellulose pulp as a main component and a thermoplastic resin layer laminated on at least one surface of the paper base material, wherein the paper base material is a linear chain. At least one of a fatty acid and a linear alcohol, the melting point of the linear fatty acid and the linear alcohol is 80 to 100° C., and the content of the linear fatty acid and the linear alcohol in the paper base material Laminated paper having a total (mass) of 100 to 2500 ppm.
  • the paper base material contains both the linear fatty acid and the linear alcohol, and the ratio of the linear alcohol content (mass) to the linear fatty acid content (mass) is 3.
  • the method for producing a laminated paper according to any one of (1) to (6) above, which comprises a step of making a paper base material containing cellulose pulp as a main component, and at least one of the paper base materials. Laminating step of laminating a thermoplastic resin layer on the surface of the sheet, and contacting the article heated to 100° C. or higher with the paper base material in at least one of the paper making step and the laminating step.
  • a method for producing a laminated paper having:
  • a laminated paper according to an embodiment of the present invention has a paper base material containing cellulose pulp as a main component, and a thermoplastic resin layer laminated on at least one surface of the paper base material.
  • a paper base material containing cellulose pulp as a main component
  • a thermoplastic resin layer laminated on at least one surface of the paper base material.
  • the paper base material and the thermoplastic resin layer can be easily peeled off, and the raw materials can be easily recycled.
  • the laminated paper according to this embodiment has excellent adhesiveness and smoothness. Further, the laminated paper according to the present embodiment has less odor and pinholes.
  • a laminated paper base material contains cellulose pulp as a main component and contains at least one of a linear fatty acid and a linear alcohol, and the melting point of the linear fatty acid and the linear alcohol is 80 to The temperature is 100° C., and the total content of the linear fatty acid and the linear alcohol is 100 to 2500 ppm.
  • the paper base material causes less papermaking stain when the paper base material is manufactured.
  • Embodiments of the present invention will be described below. However, the embodiments of the present invention are not limited to the following embodiments.
  • “X to Y” indicating a range means “X or more and Y or less”. Unless otherwise specified, operations and measurement of physical properties are performed in an environment of a temperature of 23° C. ⁇ 1° C. and a humidity of 50 ⁇ 2% described in JIS P8111:1998. )/Relative humidity 40 to 50% RH.
  • the laminated paper of the present embodiment has a paper base material containing cellulose pulp as a main component, and a thermoplastic resin layer laminated on at least one surface of the paper base material.
  • a paper base material containing cellulose pulp as a main component containing cellulose pulp as a main component
  • a thermoplastic resin layer laminated on at least one surface of the paper base material is laminated on at least one surface of the paper base material.
  • the paper base material is mainly composed of cellulose pulp.
  • the main component means a component accounting for 50% by mass or more of the components constituting the paper base material.
  • the cellulose pulp include wood pulp and non-wood pulp.
  • the wood pulp include bleached kraft pulp of softwood (NBKP), softwood kraft pulp (NKP), bleached kraft pulp of hardwood (LBKP), hardwood kraft pulp (LKP), and other wood pulp, sulfite pulp ( Examples thereof include chemical pulp such as SP), dissolving pulp (DP), soda pulp (AP), unbleached kraft pulp (UKP), and oxygen bleached kraft pulp (OKP).
  • semi-chemical pulps such as semi-chemical pulp (SCP) and chemi-groundwood pulp (CGP)
  • mechanical pulps such as groundwood pulp (GP) and thermomechanical pulp (TMP, BCTMP)
  • non-wood pulp examples include hemp, bagasse, cotton and the like. These pulps can be used alone or in combination of two or more.
  • wood-based pulp such as LKP (eg, acacia wood, eucalyptus wood) is suitable as the pulp constituting the paper base material.
  • the pulp constituting the paper base material is preferably wood pulp, more preferably acacia or eucalyptus-derived wood pulp, and even more preferably acacia or eucalyptus-derived LKP.
  • LBKP derived from acacia or eucalyptus can be preferably used as a paper base material for liquid containers.
  • the raw material pulp is not limited to virgin pulp.
  • the fiber roughness of the disaggregation raw material of the paper base material measured by Kajaani Fiber Lab is preferably 0.020 to 0.18 mg/m.
  • the disintegration method of the paper base material is performed in accordance with JIS P8220-1:2012. Generally, the smaller the fiber roughness is, the finer the fibers are, and the fibers are densely packed in the paper base material, so that the bleeding of the linear fatty acid or the linear alcohol becomes uniform. Further, when the fiber roughness is small, the surface smoothness of the paper base material is improved, and the uniform adhesiveness of the laminate is improved, which is preferable. Further, since the surface smoothness of the paper base material is improved, the printability on the surface of the paper base material is improved and the surface smoothness after lamination is also improved.
  • the projected length-weighted average fiber length of the fibers constituting the paper substrate is preferably 0.40 to 2.00 mm.
  • the average fiber length of the fibers is measured according to JIS P8226:2006.
  • the paper base material may be a single-layer paper or a multi-layer paper (multi-layer paper) composed of two or more layers.
  • the number of layers is preferably 2 or more and 6 or less, and more preferably 3 or more and 5 or less.
  • the raw material composition of each layer, the basis weight, the papermaking conditions and the like can be arbitrarily adjusted.
  • a starch, a paper strengthening agent, etc., which strengthens the interlayer adhesion may be contained. By such an operation, the bleeding of the straight-chain fatty acid and the straight-chain alcohol can be controlled, and the texture and smoothness of the paper substrate can be improved and the surface property can be improved.
  • the paper base material contains at least one kind of linear fatty acid and linear alcohol, and preferably contains both linear fatty acid and linear alcohol.
  • the linear fatty acid may be one type alone or two or more types.
  • the linear alcohol may be one kind alone or two or more kinds.
  • the linear fatty acid is a monovalent carboxylic acid having a linear alkyl group.
  • the straight-chain alcohol is a monovalent alcohol having a straight-chain alkyl group.
  • the content of the straight chain fatty acids represents the sum of the individual contents.
  • the content of linear alcohols represents the sum of the individual contents.
  • Cellulose pulp generally contains straight-chain fatty acids and straight-chain alcohols.
  • straight chain fatty acids and straight chain alcohols are generally synthesized starting from acetic acid having 2 carbon atoms. Therefore, the carbon number of the synthesized fatty acid or alcohol is even.
  • the present inventor examined the peeling behavior of a laminated paper composed of a paper base material containing a linear fatty acid or a linear alcohol and a thermoplastic resin layer.
  • a linear fatty acid or a linear alcohol having a melting point of 80 to 100° C. is present in the paper base material
  • the linear fatty acid or the linear alcohol may be converted into a paper base material with the lapse of time after the production of laminated paper. It was found to bleed near the surface (release to the surface). Further, the linear fatty acid or linear alcohol bleeds near the surface of the paper base material and then enters the interface with the thermoplastic resin layer.
  • they have found that, after a certain amount of time has passed after laminating the paper base material and the thermoplastic resin layer, the paper base material and the thermoplastic resin layer are easily separated from each other.
  • the melting point of the linear fatty acid and the linear alcohol is 80 to 100°C.
  • the straight-chain fatty acid and the straight-chain alcohol can be melted by the heat of a device such as a dryer heated to 100° C. or higher used during the production of the paper base material, or to 100° C. or higher in the laminating step. Since it is melted by the heat of the heat-melted thermoplastic resin, it can be uniformly distributed in the paper base material. Further, since the linear fatty acid and the linear alcohol bleed over time, the paper base material and the thermoplastic resin layer can be easily separated from each other.
  • Linear fatty acids having a melting point of 80 to 100° C. are, for example, behenic acid having 22 carbon atoms (melting point 80° C.), lignoceric acid having 24 carbon atoms (melting point 84° C.), hexacosanoic acid having 26 carbon atoms (melting point 88° C. ), octacosanoic acid having 28 carbon atoms (melting point 91° C.), and triacontanoic acid having 30 carbon atoms (melting point 94° C.).
  • the melting point of the straight-chain fatty acid and straight-chain alcohol is too low (for example, below 80°C), it is considered that bleeding is excessively promoted in the dryer or laminating process, so that the adhesion failure of the laminate is likely to occur.
  • the melting point of the straight-chain fatty acid and the straight-chain alcohol is too high (for example, higher than 100° C.), the straight-chain fatty acid and the straight-chain alcohol will not be melted by the heat of the dryer or the like, and therefore the distribution of the straight-chain fatty acid and the straight-chain alcohol in the paper base material will be small. It is considered that the components are not homogenized and the components are aggregated and hardened, so that the foreign substances are easily formed.
  • the content of the linear fatty acid having a melting point of 80 to 100° C. in the paper base material is preferably 100 ppm or more, more preferably 300 ppm or more, and further preferably 400 ppm. Or more, more preferably 500 ppm or more, and particularly preferably more than 600 ppm. Further, from the viewpoint of suppressing the odor and pinholes of the laminated paper, the content of the linear fatty acid having a melting point of 80 to 100° C.
  • the paper base material is preferably 2300 ppm or less, more preferably 1900 ppm or less, and It is preferably 1700 ppm or less, even more preferably 1300 ppm or less, particularly preferably 1100 ppm or less, and most preferably less than 1000 ppm.
  • the number of linear fatty acids having a melting point of 80 to 100° C. may be only one, or two or more. In the case of two or more kinds, the content of linear fatty acid having a melting point of 80 to 100° C. in the paper substrate represents the sum of the individual contents.
  • the content of the linear fatty acid having 24, 26 or 28 carbon atoms in the paper base material is preferably 50 ppm or more, more preferably 200 ppm or more, and further preferably Is 300 ppm or more, more preferably 400 ppm or more, and particularly preferably more than 500 ppm.
  • the content of the linear fatty acid having 24, 26 or 28 carbon atoms in the paper base material is preferably 2000 ppm or less, more preferably 1600 ppm or less. It is even more preferably 1000 ppm or less, and particularly preferably 900 ppm or less.
  • the number of linear fatty acids having 24, 26 or 28 carbon atoms may be only one, or two or more.
  • the content of the linear fatty acid having 24, 26 or 28 carbon atoms in the paper substrate represents the sum of the individual contents.
  • the content of the linear alcohol having a melting point of 80 to 100° C. in the paper base material is preferably 20 to 600 ppm, more preferably 120 to 350 ppm, and particularly preferably. It is 150 to 250 ppm.
  • the linear alcohol having a melting point of 80 to 100° C. may be only one type or two or more types. In the case of two or more kinds, the content of the linear alcohol having a melting point of 80 to 100° C. in the paper substrate represents the total of the individual contents.
  • the content of the linear alcohol having 26 or 28 carbon atoms in the paper base material is preferably 10 to 500 ppm, more preferably 50 to 300 ppm, and particularly preferably. It is 150 to 200 ppm.
  • the linear alcohol having 26 or 28 carbon atoms may be only one kind or two or more kinds. In the case of two or more kinds, the content of the linear alcohol having 26 or 28 carbon atoms in the paper substrate represents the sum of the individual contents.
  • the total content (mass) of linear fatty acid and linear alcohol in the paper base material is 100 to 2500 ppm.
  • the linear fatty acid is a linear fatty acid having a melting point of 80 to 100° C., preferably a linear fatty acid having 24, 26 or 28 carbon atoms.
  • the straight-chain alcohol is a straight-chain alcohol having a melting point of 80 to 100° C., preferably a straight-chain alcohol having 26 or 28 carbon atoms. That is, according to a preferred embodiment of the present invention, the total content of the linear fatty acid having 24, 26 or 28 carbon atoms and the linear alcohol having 26 or 28 carbon atoms in the paper substrate is 100 to 2500 ppm. ..
  • the straight-chain fatty acid may consist of only one kind of straight-chain fatty acid having a melting point of 80 to 100°C, or a mixture containing a plurality of straight-chain fatty acids having a melting point of 80 to 100°C. May be When two or more straight-chain fatty acids having a melting point of 80 to 100° C. are contained, the content of the straight-chain fatty acids having a melting point of 80 to 100° C. is the sum of the individual contents.
  • the straight-chain alcohol may consist of only one kind of straight-chain alcohol having a melting point of 80 to 100° C., or a mixture containing a plurality of kinds of straight-chain alcohol having a melting point of 80 to 100° C.
  • the content of the straight-chain alcohol having a melting point of 80 to 100° C. represents the sum of the individual contents.
  • the content of linear fatty acid or linear alcohol can be quantified by the method described below.
  • the paper substrate may further contain a linear fatty acid or a linear alcohol having a melting point of 80 to 100° C. as long as it does not hinder the effect of the present invention.
  • the fatty acid salt (calcium salt, etc.) is accumulated in the manufacturing apparatus to form paper.
  • the base material may be soiled. These compounds may be deposited in the paper base material or on the surface of the paper base material as a coagulation foreign substance, which may deteriorate the uniformity of lamination adhesion. If the uniformity of laminate adhesion is reduced, not only the adhesiveness is lowered, but also a minute gap is generated at the interface between the paper base material and the thermoplastic resin layer, which may easily cause pinholes.
  • the total content of linear fatty acid having a melting point of 80 to 100° C. and linear alcohol having a melting point of 80 to 100° C. in the paper base material is preferably 150 ppm or more and 200 ppm or more.
  • it is 300 ppm or more, more preferably 400 ppm or more, still more preferably 500 ppm or more, even more preferably 600 ppm or more, particularly preferably 700 ppm or more, and most preferably 800 ppm or more.
  • the viewpoint of suppressing the odor and pinholes of the laminated paper it is preferably 2300 ppm or less, more preferably 2000 ppm or less, even more preferably 1600 ppm or less, particularly preferably 1400 ppm or less, and most preferably It is 1300 ppm or less.
  • the total content of the linear fatty acid having 24, 26 or 28 carbon atoms and the linear alcohol having 26 or 28 carbon atoms in the paper base material is preferably 80 ppm or more. Yes, it is more preferably 300 ppm or more, still more preferably 400 ppm or more, even more preferably 500 ppm or more, particularly preferably 600 ppm or more, and most preferably 700 ppm or more. Further, from the viewpoint of suppressing the odor and pinholes of the laminated paper, it is preferably 2300 ppm or less, more preferably 1600 ppm or less, even more preferably 1200 ppm or less, and particularly preferably 1100 ppm or less.
  • the melting point of the straight-chain fatty acid and the straight-chain alcohol in the paper base material is within the above temperature range and the content is in the above range, there is a problem in the adhesiveness between the paper base material and the thermoplastic resin layer during the production of laminated paper. There is no.
  • the laminated paper is manufactured, it is used as a paper container, and at the end of its product life, linear fatty acid or linear alcohol bleeds near the surface of the paper base material to form a paper base material and a thermoplastic resin layer. Can be controlled so that peeling can be facilitated.
  • the straight chain fatty acid having a melting point of 80 to 100° C. preferably has 24, 26 or 28 carbon atoms.
  • the linear alcohol having a melting point of 80 to 100° C. preferably has 26 or 28 carbon atoms.
  • the straight chain fatty acid having 24, 26 or 28 carbon atoms is a monovalent straight chain fatty acid having a carbon number selected from the group consisting of 24, 26 and 28 carbon atoms.
  • the linear alcohol having 26 or 28 carbon atoms is a monovalent linear alcohol having a carbon number selected from the group consisting of 26 and 28 carbon atoms.
  • the amount of linear fatty acid or linear alcohol contained in the cellulose pulp depends on the steps of cooking wood chips, which is the raw material of pulp, and collecting fibers, washing, bleaching, and washing after bleaching. It can be adjusted in any one of a process, a paper making process, a coating process, or a plurality of processes.
  • the amount of straight-chain fatty acid or straight-chain alcohol contained in the cellulose pulp, which is a raw material of the paper base material by addition of alkali in the washing step after bleaching, addition of oil-absorbing particles such as microtalc, and dispersant such as pitch control agent. Can be adjusted.
  • the content of the linear fatty acid and the linear alcohol in the paper base is adjusted to the above range by using the pulp of the tree species containing a large amount of these linear fatty acids or the linear alcohol as a raw material of the paper base. It can be quantified.
  • the ratio (content) of the linear alcohol having a melting point of 80 to 100° C. to the content (mass) of the linear fatty acid having a melting point of 80 to 100° C. is preferably 2.0 to 35%, and 3.0. It is more preferably from 3 to 33.3%, and even more preferably from 4.0 to 33.3%. If the amount of the linear fatty acid is too large, it may accumulate in the manufacturing apparatus in the form of calcium salt or the like, which may lead to stain of the paper substrate. On the other hand, if the amount of the linear fatty acid is too small, the surfactant action may be insufficient and the bleeding may be insufficient. Further, from the viewpoint of further improving the effect of the present invention, the above ratio is preferably 8.0 to 35%.
  • the total ratio of the content of the linear fatty acid having a melting point of 80 to 100° C. and the content of the linear alcohol having a melting point of 80 to 100° C. to the solid content of the thermoplastic resin layer is preferably 0.10 to 15% by mass. , And more preferably 0.20 to 13% by mass. If the ratio is too large, the effect of facilitating the peeling of the paper base material and the thermoplastic resin layer due to bleeding tends to occur, but the adhesion between the paper base material and the thermoplastic resin layer may be insufficient.
  • the adhesiveness between the paper base material and the thermoplastic resin layer is strong, but the effect of facilitating the peeling between the paper base material and the thermoplastic resin layer due to bleeding is less likely to occur, and the releasability is improved. May run short.
  • the method for measuring the content of the linear fatty acid and the linear alcohol in the paper base material is not particularly limited, but it can be measured, for example, by the method described in Examples below.
  • the content of linear fatty acid and linear alcohol in the paper base material is measured by the following method. You may. First, the mass (g/m 2 ) of the thermoplastic resin layer of the laminated paper is obtained. Laminated paper 10 cm ⁇ 10 cm is cut out and the thermoplastic resin layer is peeled off.
  • the peeled thermoplastic resin layer was immersed in a copper ethylenediamine (CED) solution described in JIS P8215:1998 for 24 hours to dissolve and remove the fibers of the paper base material remaining on the peeled surface, and then wiped off the water well, and the mass ( mg). If the dissolution of the fibers is insufficient after the immersion for 24 hours, the immersion time is extended until the fibers remain.
  • the mass (g/m 2 ) of the thermoplastic resin layer of the laminated paper is calculated by the following formula.
  • the paper substrate mass (mg) of the laminated paper is obtained by subtracting from the mass (mg) of the laminated paper of 30 mm.
  • the mass (mg) of the thermoplastic resin layer per 30 mm ⁇ 30 mm of the laminated paper represents the total mass (mg) of the individual thermoplastic resin layers. ..
  • the total amount is divided into small pieces of 10 mm ⁇ 10 mm. All of the divided test pieces are placed in a glass container, 0.1 ml of concentrated hydrochloric acid (12N) and 2 ml of chloroform are added, and ultrasonic treatment is performed for 30 minutes.
  • the column used was a Waters X Bridge C18, 250 mm ⁇ 4.6 mm I.D. In D, the temperature was 30° C. and 2 ⁇ l of the filtrate was injected.
  • the detector uses a charged particle detector to detect linear alcohol and linear fatty acid, and the concentration in the sample is calculated for each of them by the following calculation formula.
  • the peak area value of each component is the portion surrounded by the apele line and each peak, but partially overlapping peaks are obtained by separating the peaks by the perpendicular method of JIS K 0124:2011.
  • Calculation formula: Concentration in paper base material (ppm) ⁇ standard product concentration/standard product peak area value ⁇ sample peak area value ⁇ 2 (ml) ⁇ (paper base material mass (mg) ⁇ 1000) ⁇
  • the method of incorporating the straight-chain fatty acid and the straight-chain alcohol into the paper base material is not particularly limited, and examples thereof include the following methods. Among these, the method (1) is preferable because it is not necessary to change the conventional manufacturing process.
  • (1) A method of using the pulp of a tree species containing a large amount of the above linear fatty acid and linear alcohol as a raw material for a paper base material.
  • (2) A method of adding a predetermined amount of a chemical agent containing a linear fatty acid and a linear alcohol, or a component thereof in any of the pulp manufacturing step or the paper-making paper making step.
  • a filler may be blended when making the paper base material.
  • a filler generally used in the field of papermaking can be used and is not particularly limited. For example, by using an inorganic mineral such as talc as the filler, the linear fatty acid or linear alcohol contained in the paper base material can be appropriately adsorbed to adjust the bleeding.
  • the basis weight of the paper substrate is not particularly limited, but it is preferably 150 to 500 g/m 2 . If it is 150 g/m 2 or less, the rigidity may be insufficient when molded into a paper container. On the other hand, when it is 500 g/m 2 or more, a large amount of chemicals and raw materials are used, which may result in high cost.
  • An arbitrary layer such as a layer containing a water-soluble polymer (water-soluble polymer layer) and a coating layer containing a pigment and an adhesive as a main component may be provided on at least one surface of the paper base material.
  • These layers can be used alone or in combination of two or more. That is, on at least one surface of the paper substrate, only the water-soluble polymer layer may be provided, or only the coating layer may be provided, or the water-soluble polymer layer and the coating layer may be formed. Both may be provided.
  • the water-soluble polymer is not particularly limited, but from the viewpoint of processability, polyvinyl alcohol (PVA), starches, polyacrylamides, polyethyleneimines and the like are preferable.
  • the pigment that can be used in the coating layer is not particularly limited, and examples thereof include purified natural mineral pigments such as various kaolin, talc, or ground calcium carbonate, light calcium carbonate, or calcium carbonate and other hydrophilic materials.
  • the method for forming the water-soluble polymer layer and the coating layer is not particularly limited, and a blade coater, a rod coater, a size press or the like can be used.
  • the water-soluble polymer layer may be one layer or two or more layers.
  • the coating layer may be one layer or two or more layers.
  • the paper substrate is manufactured by making paper in the paper making process.
  • the paper-making method of paper base material and the type of paper machine include known paper-making methods and paper-making machines such as fourdrinier paper machine, twin wire paper machine, cylinder paper machine, gap former, on-top former and success former. Can be used and is not limited. In particular, when making a multi-layer paper, it is preferable to use a multi-layer paper machine.
  • the pH during papermaking may be any of acidic region (acidic papermaking), pseudo-neutral region (pseudo-neutral papermaking), neutral region (neutral papermaking), and alkaline region (alkaline papermaking), and is not limited. ..
  • the thermoplastic resin layer is formed by laminating the thermoplastic resin layer on a paper base material.
  • the thermoplastic resin either a crystalline resin or a non-crystalline resin can be used depending on the application.
  • the thermoplastic resin includes polyethylene (LDPE, MDPE, HDPE, LLDPE, etc.), polypropylene, polyolefin resin such as polymethylpentene, polyester resin such as PET and PBT, polyamide resin, polylactic acid (PLA), polyhydroxybutyric acid (PHB).
  • polystyrene polyvinyl chloride
  • ABS acrylonitrile-butadiene-styrene
  • PPE modified polyphenylene ether
  • thermoplastic resins may be used alone or in combination of two or more. Among them, polyolefin resin or biodegradable resin is preferable, polyethylene, PLA, PBS, PBAT or PHBH is more preferable, polyethylene is further preferable, and LDPE is particularly preferable.
  • the thermoplastic resin layer may be formed as a single layer of a single resin, may be formed as a single layer by mixing a plurality of resins, or may be formed as a plurality of layers made of the same kind or different kinds of resins. You may. That is, the thermoplastic resin layer may be one layer or two or more layers.
  • the thickness of the thermoplastic resin layer is not particularly limited, but is usually about 10 to 50 ⁇ m.
  • the above thickness represents the thickness of each layer.
  • Laminated paper has a paper base material and a thermoplastic resin layer laminated on at least one surface of the paper base material.
  • the preferred embodiment of the paper substrate is as described above.
  • the preferable aspect of a thermoplastic resin layer is as above-mentioned.
  • the thermoplastic resin layer may be laminated only on one surface of the paper base material, or may be laminated on both surfaces of the paper base material.
  • Laminated paper is manufactured by laminating a thermoplastic resin layer on at least one surface of a paper base material in a laminating step.
  • thermoplastic resin layer on the paper substrate As a method for laminating the thermoplastic resin layer on the paper substrate, various known methods such as extrusion laminating method, dry laminating method, wet laminating method, thermal laminating method and co-extrusion laminating method can be appropriately used.
  • the paper base material or the thermoplastic resin layer may be subjected to an oxidation treatment such as corona treatment, ozone treatment, or flame treatment, if necessary.
  • an oxidation treatment such as corona treatment, ozone treatment, or flame treatment, if necessary.
  • polar groups are generated on the surface of the paper base material or the thermoplastic resin layer, and the adhesiveness can be improved.
  • These treatments may be performed on either the paper substrate or the thermoplastic resin layer, or both. Further, the number of times of these processes may be once or may be repeated a plurality of times.
  • At least one of the paper making step and the laminating step is brought into contact with a paper base material heated to 100° C. or higher.
  • a material heated to 100° C. or higher By contacting a material heated to 100° C. or higher with the paper base material, the linear fatty acid and the linear alcohol contained in the paper base material are melted and uniformly distributed in the paper base material. be able to.
  • the material heated to 100° C. or higher may be, for example, a device such as a dryer, a heating roll, a heating cylinder roll, an extruder, an infrared heater, a flame treatment, or a thermoplastic resin at the time of lamination, and is not particularly limited. Not done.
  • the method of contacting with a heated object may be direct contact, or indirect contact through canvas, air or the like. These treatments may be performed once or may be repeated a plurality of times.
  • the laminated paper according to the present embodiment preferably has a basis weight of 150 to 500 g/m 2 , and more preferably 200 to 400 g/m 2 . If the basis weight is too small, heat is transferred too much during the production of the laminated paper, and there is a risk that the linear fatty acid or the linear alcohol may excessively bleed during the production. On the other hand, if the basis weight is too large, heat cannot be easily transferred during the production of laminated paper, so that the straight-chain fatty acid or straight-chain alcohol cannot be uniformly dispersed during the production, bleeding does not occur uniformly, and peeling becomes difficult. There is a risk.
  • the laminated paper according to this embodiment preferably has a thickness of 200 to 750 ⁇ m. Further, laminated paper having a paper substrate and the thermoplastic resin layer is preferably a density of 0.50 ⁇ 1.30g / cm 3, further to be 0.60 ⁇ 1.20g / cm 3 preferable.
  • the laminated paper of the present embodiment has sufficient laminate adhesiveness from the time the laminated paper is manufactured to the time it is used as a container. On the other hand, when the container is collected after use and reused, the adhesiveness deteriorates and the paper base material and the thermoplastic resin layer are easily separated, so the pulp of the paper base material can be easily recycled. You can
  • the laminated paper is put into a pulper and disaggregated.
  • the paper base material and the thermoplastic resin layer are easily separated from each other, so that the raw materials can be easily separated and recovered and recycled.
  • the laminated paper is basically a laminated paper having a two-layer structure or a three-layer structure composed of a paper base material and a thermoplastic resin layer, but other than that, various laminated structure of various types is used according to the application. Can be formed.
  • a thermoplastic resin layer of the same type or different types may be further provided on a laminated paper composed of a paper base material and a thermoplastic resin layer, or a layer other than the thermoplastic resin layer may be provided between the thermoplastic resin layer and the thermoplastic resin layer.
  • a layer other than the thermoplastic resin layer can be provided between the paper base material and the thermoplastic resin layer.
  • Layers other than the thermoplastic resin layer include the above water-soluble polymer layer (PVA layer and the like), a coating layer containing a pigment and an adhesive as a main component, an aluminum foil (Al foil), a printing layer and the like.
  • layer structure of laminated paper examples include paper base material/LDPE, paper base material/coating layer/LDPE, LDPE/paper base material/LDPE, LDPE/paper base material/coating layer/LDPE, LDPE. /PVA/paper base material/PVA/LDPE, LDPE/paper base material/LDPE/PET/LDPE, LDPE/paper base material/LDPE/Al foil/LDPE, but not limited to these.
  • Paper container Various paper containers can be manufactured using the laminated paper of this embodiment. As a method for producing the paper container, a known method can be appropriately selected and used.
  • Liquid paper container Various liquid paper containers can be manufactured using the laminated paper of this embodiment. As a method of manufacturing the liquid paper container, a known method can be appropriately selected and used.
  • thermoplastic resin layer By manufacturing the paper container so that the thermoplastic resin layer is on the inside, the liquid of the contents is held by the thermoplastic resin layer, so the liquid penetrates into the paper base material side and the paper base material discolors. Can be suppressed.
  • Laminated paper provided with a thermoplastic resin layer such as PE on both outer and inner sides of a paper base is heat-treated at a temperature higher than the boiling point of water and the melting point of the thermoplastic resin to form the thermoplastic resin layer on the paper base.
  • a paper container having a heat insulating property can be obtained.
  • the heat-insulating paper container can be used as, for example, a heat-insulating paper container having the contents of a heated liquid/solid or cooled liquid/solid.
  • the laminated paper of the present embodiment is a liquid paper container such as a milk carton, a paper cup, a foaming cup, an ice cup, a heat insulating cup, a coffee container, an aseptic container, a paper container such as a packaging container, and a variety of packaging materials, heat insulating materials, and the like. It can be used for various purposes.
  • Pulp LBKP Acacia pulp
  • eucalyptus pulp NBKP Douglas fir
  • Thermoplastic resin PE LDPE manufactured by Nippon Polyethylene Corporation, product number Novatec (trademark) LC522
  • the following shows the measurement method performed on the paper substrate and laminated paper. Unless otherwise specified, the measurement was performed in an environment of temperature 23°C ⁇ 1°C and humidity 50 ⁇ 2% described in JIS P8111:1998.
  • the projected length weighted average fiber length and roughness were measured according to JIS P8226:2006.
  • a fiber length measuring device manufactured by Metso Automation, Kajaani Fiber Lab Ver4.0 was used for the measurement.
  • Density Measured according to JIS P8118:2014. The thickness was measured when a pressure of 100 kPa ⁇ 10 kPa was applied to the circular area (200 mm 2 ) of the test piece.
  • thermoplastic resin layer 10 cm ⁇ 10 cm of laminated paper was cut out and the thermoplastic resin layer was peeled off. The peeled thermoplastic resin layer was immersed in a copper ethylenediamine (CED) solution described in JIS P8215:1998 for 24 hours to dissolve and remove the fibers of the paper base material remaining on the peeled surface, and then wiped off moisture well (mg ). The mass (g/m 2 ) of the thermoplastic resin layer was calculated by the following formula.
  • CED copper ethylenediamine
  • the density (g/cm 3 ) of the thermoplastic resin the density publicly announced as a resin product was used.
  • the density of a low-density polyethylene resin product number Novatec (trademark) LC522 manufactured by Nippon Polyethylene Corporation is 0.923 g/cm 3 .
  • the content of linear fatty acid and linear alcohol in the paper base material was measured as follows. A paper base material 30 mm ⁇ 30 mm was cut out and the paper base material mass (mg) was precisely measured. After delaminating the cut-out test piece in the thickness direction, the whole amount was divided into small pieces of 10 mm ⁇ 10 mm. All of the divided test pieces were placed in a glass container, 0.1 ml of concentrated hydrochloric acid (12N) and 2 ml of chloroform were added, and ultrasonic treatment was performed for 30 minutes. The extract obtained at this time was filtered with a membrane filter (pore diameter 0.2 ⁇ m). Analysis was performed by high performance liquid chromatography using the above filtrate.
  • Example 1 Paper substrate
  • 100 parts of LBKP 80% acacia wood, 20% eucalyptus wood
  • LBKP 80% acacia wood, 20% eucalyptus wood
  • paper was made using a 5-layer paper machine.
  • 3.0 parts by mass (in terms of solid content) of potato starch was sprayed between the layers by interlayer spraying, and after 5 layers of papermaking, the oxidized starch was applied to both surfaces of the paper base material by a size press to 1 .0g / m 2 (solid basis) was applied to obtain a paper substrate having a basis weight of 274 g / m 2.
  • the linear fatty acid and the linear alcohol shown in Table 1 were contained.
  • thermoplastic resin layer LDPE (Novatech (trademark) LC522: manufactured by Nippon Polyethylene Corporation, density 0.923 g/cm 3 ) was laminated as a thermoplastic resin on both the outer and inner surfaces of the obtained paper substrate.
  • the lamination of the thermoplastic resin layer was performed by an extrusion laminating method at a laminating temperature of 330° C. and a laminating speed of 200 m/min.
  • the thickness and mass of the thermoplastic resin layer were as described in Table 1, and laminated paper was obtained.
  • Example 2 As a pulp raw material, 100 parts of LBKP (70% acacia wood, 30% eucalyptus wood) was beaten using a double disc refiner to obtain a pulp slurry. With respect to 100 parts of the obtained pulp slurry, 0.60 part of cationic starch as an internal paper strength enhancer (solid content conversion) and 0.30 part of alkyl ketene dimer sizing agent as internal addition size agent (solid content conversion) ), 0.20 part of sulfuric acid band (solid content conversion), and 0.10 parts by mass (solid content conversion) of polyamide-amine epichlorohydrin-based wet paper strength agent as a wet paper strength agent. Prepared. Using this stock, paper was made using a 5-layer paper machine.
  • Example 3 As a pulp raw material, 80 parts of LBKP (60% of acacia wood, 40% of eucalyptus wood) and 20 parts of NBKP (50% of Douglas fir, 30% of radiata pine, 20% of cedar) were beaten using a double disc refiner, respectively, to obtain a pulp slurry.
  • LBKP acacia wood, 40% of eucalyptus wood
  • NBKP 50% of Douglas fir, 30% of radiata pine, 20% of cedar
  • Example 4 As a pulp raw material, 80 parts of LBKP (40% of acacia wood, 60% of eucalyptus wood) and 20 parts of NBKP (50% of Douglas fir, 30% of radiata pine, 20% of cedar) were beaten using a double disc refiner, respectively, to obtain a pulp slurry.
  • LBKP 50% of acacia wood, 60% of eucalyptus wood
  • NBKP 50% of Douglas fir, 30% of radiata pine, 20% of cedar
  • interlayer starch was sprayed with 4.0 parts by mass of potato starch (converted to solid content) between the layers, and after 5 layers of papermaking, 3 parts of oxidized starch were applied to both surfaces of the paper base material with a size press.
  • 0.0 g/m 2 solid content conversion
  • the obtained paper base material contained the linear fatty acids and linear alcohols shown in Table 1.
  • a gable-top type paper container was obtained in the same manner as in Example 1 except that a thermoplastic resin layer was laminated on the obtained paper base material so that the thickness and mass were as shown in Table 1.
  • Example 5 50 parts of LBKP (50% of acacia wood, 50% of eucalyptus wood) and 50 parts of NBKP (50% of Douglas fir, 30% of radiata pine, 20% of cedar) as pulp raw materials were beaten using a double disc refiner, respectively, to obtain a pulp slurry.
  • interlayer starch was sprayed with 4.0 parts by mass of potato starch (converted to solid content) between the layers, and after 5 layers of papermaking, 3 parts of oxidized starch were applied to both surfaces of the paper base material with a size press.
  • 0.0 g/m 2 solid content conversion
  • the obtained paper base material contained the linear fatty acids and linear alcohols shown in Table 1.
  • a gable-top type paper container was obtained in the same manner as in Example 1 except that a thermoplastic resin layer was laminated on the obtained paper base material so that the thickness and mass were as shown in Table 1.
  • Example 6 50 parts of LBKP (50% of acacia wood, 50% of eucalyptus wood) and 50 parts of NBKP (50% of Douglas fir, 30% of radiata pine, 20% of cedar) as pulp raw materials are beaten using a double disc refiner, respectively, to obtain a pulp slurry.
  • Example 7 As a pulp raw material, 10 parts of LBKP (30% of acacia wood, 70% of eucalyptus wood) and 90 parts of NBKP (50% of Douglas fir, 30% of radiata pine, 20% of cedar) were beaten using a double disc refiner, respectively, to obtain a pulp slurry.
  • Example 8 As a pulp raw material, 10 parts of LBKP (20% of acacia wood, 80% of eucalyptus wood) and 90 parts of NBKP (50% of Douglas fir, 30% of radiata pine, 20% of cedar) were beaten using a double disc refiner, respectively, to obtain a pulp slurry.
  • paper was made using a four-layer paper machine. During the papermaking process, 3.0 parts by mass (in terms of solid content) of potato starch was sprayed between the layers by interlayer spraying, and after 5 layers of papermaking, 2 layers of oxidized starch were applied to both surfaces of the paper base material with a size press. 0.3 g/m 2 (solid content conversion) was applied to obtain a paper base material having a basis weight of 278 g/m 2 . The obtained paper base material contained the linear fatty acids and linear alcohols shown in Table 1.
  • a gable-top type paper container was obtained in the same manner as in Example 1 except that a thermoplastic resin layer was laminated on the obtained paper base material so that the thickness and mass were as shown in Table 1.
  • the Oken type smoothness of the surface on the thermoplastic resin layer side was measured according to JIS P8155:2010.
  • the Oken type smoothness was 250 seconds or more, it was evaluated as ⁇ , when 200 seconds or more and less than 250 seconds was evaluated as ⁇ , when 100 seconds or more and less than 200 seconds was evaluated as ⁇ , and when less than 100 seconds was evaluated as x.
  • the laminated paper of the gable-top type paper containers obtained in Examples and Comparative Examples was laminated with a thermoplastic resin layer, stored for 1 month under a humidity condition of 23° C. and 50%, and then heat-treated in accordance with JIS K6854-3:1999.
  • the adhesive strength between the plastic resin layer and the paper substrate was measured.
  • the width of the test piece was 25 mm
  • the length of the bonded portion was 150 mm
  • the degree of peeling in a 100 mm area excluding 25 mm at both ends of the bonded portion was visually evaluated by ⁇ , ⁇ , ⁇ or ⁇ .
  • the frequency of occurrence of paper stains when the paper substrates obtained in Examples and Comparative Examples were made was evaluated by ⁇ , ⁇ , ⁇ or ⁇ .
  • the number of dust particles of 0.05 mm 2 or more in an area corresponding to 100 g of the obtained paper base material was measured. If the number of dust particles was 0, it was ⁇ , if it was 1 to 4, it was 0, 5 or more. Bad x.
  • the laminated paper of the gable-top type paper containers obtained in Examples and Comparative Examples was evaluated for odor after laminating the thermoplastic resin layer and storing the laminated paper for 1 month under a humidity condition of 23° C. and 50%.
  • the odor was evaluated by 10 panelists and scored according to the following criteria.
  • the average of the scores of 10 panelists is 0 point or more and less than 1 point, ⁇ if 1 point or more and less than 2 points, 0 if 2 points or more and less than 3 points, and 3 points or more and 4 points or less If there is an x ⁇ Strong odor and discomfort 4 points ⁇ Small odor and discomfort 3 points ⁇ Slightly weak odor but discomfort 2 points ⁇ Small odor and weak odor 1 point ⁇ No odor and almost no discomfort 0 points
  • the area visually stained with methylene blue reagent is regarded as a pinhole, and if the stained area is less than 10% of the area blown with hot air, ⁇ if 10% or more and less than 30% ⁇ , 30% or more 5 If less than 50%, it was evaluated as ⁇ , and if 50% or more and 100% or less, it was evaluated as x.
  • the laminated papers of Examples 1 to 8 have the smoothness of the base paper, the adhesiveness of the laminated paper, the releasability of the laminated paper, the degree of paper stain, the odor of the laminated paper, the lamination of the laminated paper.
  • the paper pinholes were all excellent.
  • Examples 5 and 6 were excellent in balance of each performance.
  • the laminated papers of Comparative Examples 1 to 6 are inferior in any of the smoothness of the base paper, the adhesiveness of the laminated paper, the peelability of the laminated paper, the degree of paper stain, the odor of the laminated paper, and the pinhole of the laminated paper. Was there.
  • the present invention also includes a second invention having the following configuration.
  • a laminated paper for a paper container having a paper base material containing cellulose pulp as a main component and a thermoplastic resin layer laminated on at least one surface of the paper base material, wherein the paper base material is Containing at least one of a straight-chain fatty acid and a straight-chain alcohol, the melting point of the straight-chain fatty acid and the straight-chain alcohol being 80 to 100° C., and the straight-chain fatty acid and the straight-chain alcohol in the paper base material.
  • Laminated paper for paper containers having a total content of 100 to 2500 ppm.
  • the laminated paper for a paper container according to (1) wherein the linear fatty acid has 24, 26 or 28 carbon atoms, and the linear alcohol has 26 or 28 carbon atoms.
  • the paper base material contains both the linear fatty acid and the linear alcohol, and the ratio of the content of the linear alcohol to the content of the linear fatty acid is 3.0 to 33.3%.
  • the laminated paper base material for paper containers according to (7) which is a multi-layered paper.
  • a method for producing a laminated paper for paper containers according to any one of (1) to (6) which comprises a step of making a paper base material containing cellulose pulp as a main component, and the paper base material.
  • a method for producing a laminated paper for a paper container which comprises contacting.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Paper (AREA)
  • Wrappers (AREA)
  • Cartons (AREA)

Abstract

L'invention porte sur : un papier laminé tel qu'un matériau de base du papier et une couche de résine thermoplastique dans celui-ci peuvent être facilement séparés l'un de l'autre, et la matière première du papier pouvant être recyclée facilement ; un matériau de base du papier pour le papier laminé ; un récipient en papier utilisant le papier laminé ; et une procédé de production pour le papier laminé. Ce papier laminé comprend un matériau de base du papier contenant de la pâte de cellulose comme composant principal, et une couche de résine thermoplastique déposée au moins sur une surface du matériau de base du papier, où le matériau de base du papier contient au moins un type parmi un acide gras à chaîne droite et un alcool à chaîne droite, le point de fusion de l'acide gras à chaîne droite et de l'alcool à chaîne droite étant compris entre 80 °C et 100 °C (inclus), et la teneur totale de l'acide gras à chaîne droite et de l'alcool à chaîne droite dans le matériau de base du papier étant de 100 à 2 500 ppm. L'invention porte également sur un matériau de base pour le papier laminé, un récipient en papier utilisant le papier laminé, et une méthode de production pour le papier laminé.
PCT/JP2020/001963 2019-01-21 2020-01-21 Papier laminé, matériau de base pour papier laminé, récipient en papier, et procédé de production de papier laminé WO2020153360A1 (fr)

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KR102321693B1 (ko) * 2020-12-30 2021-11-03 하호 압착 가열에 의해 자체밀봉이 가능한 적층시트 및 이를 이용한 친환경 포장재
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JP7255723B1 (ja) 2022-03-16 2023-04-11 王子ホールディングス株式会社 合紙及び該合紙を加工して得られる紙加工品
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