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WO2010113849A1 - Papier support pour contenant en papier et feuille stratifiée pour contenant en papier utilisant celui-ci - Google Patents

Papier support pour contenant en papier et feuille stratifiée pour contenant en papier utilisant celui-ci Download PDF

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Publication number
WO2010113849A1
WO2010113849A1 PCT/JP2010/055530 JP2010055530W WO2010113849A1 WO 2010113849 A1 WO2010113849 A1 WO 2010113849A1 JP 2010055530 W JP2010055530 W JP 2010055530W WO 2010113849 A1 WO2010113849 A1 WO 2010113849A1
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WO
WIPO (PCT)
Prior art keywords
paper
pulp
mass
layer
inner layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2010/055530
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English (en)
Japanese (ja)
Inventor
登 近藤
正明 福永
民治郎 兼行
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Paper Industries Co Ltd
Jujo Paper Co Ltd
Original Assignee
Nippon Paper Industries Co Ltd
Jujo Paper Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Paper Industries Co Ltd, Jujo Paper Co Ltd filed Critical Nippon Paper Industries Co Ltd
Priority to JP2011507176A priority Critical patent/JP5563557B2/ja
Priority to CN2010800144563A priority patent/CN102369324A/zh
Publication of WO2010113849A1 publication Critical patent/WO2010113849A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • 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
    • 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
    • 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
    • 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
    • D21H27/38—Multi-ply at least one of the sheets having a fibrous composition differing from that of other sheets
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/75—Printability
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles

Definitions

  • the present invention relates to a paper sheet for forming a paper container.
  • the present invention relates to a paper container base paper obtained by multilayer papermaking, and a paper container laminated sheet obtained by laminating a thermoplastic resin layer on the paper container base paper.
  • a typical paper container is printed on the surface of the paper, and then punched into a required shape, and then folded and completed.
  • thermoplastic resin such as polyethylene is laminated on the front and back of the base paper A method of forming by using is generally used.
  • the thermoplastic resin is used as a sealer and is melted and bonded together to complete.
  • the paper container manufactured from the above laminated sheet is provided with water resistance, oil resistance, and the like on the surface by a thermoplastic resin layer such as polyethylene.
  • a thermoplastic resin layer such as polyethylene.
  • the cross section of the base paper is exposed to the contents at the bonding portion, the liquid in the contents may permeate the base paper from the cross section of the laminated sheet. This phenomenon is particularly remarkable when the content contains a large amount of water.
  • acidic aqueous solutions such as fruit juice, yogurt, and sushi, the penetration of the solution from the cross section of the base paper is promoted, and the liquid in the contents may leak or the container may be damaged. .
  • the paper container since the paper container is folded, there may be a problem that stress such as compression or tension is concentrated on the outermost layer of the folded portion and the resin layer is broken.
  • the resin layer may be broken from the folded portion.
  • the paper container When the resin layer is destroyed, the contents leak from there, and bacteria and the like enter from the outside of the container, causing the contents to rot and causing fatal problems as a paper container. For this reason, it is important that the paper container has processability such as bending processability and drop impact resistance.
  • the base paper for paper containers it is considered preferable to use virgin pulp instead of waste paper pulp in order to prevent foreign matter from mixing into the base paper and to prevent discoloration of the container.
  • Chemical pulp in particular, softwood bleached kraft pulp (NBKP) and hardwood bleached kraft pulp (LBKP)
  • NNKP softwood bleached kraft pulp
  • LKP hardwood bleached kraft pulp
  • Paper base paper containing mainly NBKP with strong fiber strength has a tendency to reduce the smoothness of the surface of the base paper and the sharpness of printing on the surface of the thermoplastic resin layer. In particular, the uniformity of the solid part is reduced. As a result, the sharpness of the printed image decreases.
  • the formulation mainly composed of LBKP improves the smoothness of the base paper surface and is suitable for printing high-definition images, but has low fiber strength, making it difficult to obtain the processing suitability required for paper containers. .
  • the multi-layer paper making is a method of preparing a sheet of low basis weight by various paper making apparatuses, and stacking and pressing the sheet several times to produce a high basis weight paper.
  • the paper interlayer strength is lower than that of the single-layer paper, so that the paper delamination during the molding process becomes a problem.
  • Patent Document 1 proposes a method of improving paper delamination strength by including bacterial cellulose in at least one layer of a multi-layer paperboard.
  • Patent Document 2 a method of applying a thermosetting water-soluble resin as a paper interlayer adhesive
  • Patent Document 3 a paper interlayer adhesive containing two or more types of starch containing an anionic group and a cationic group is used. Proposed method to use.
  • Patent Document 4 a specific amount of aluminum sulfate, a polyacrylamide-based dry paper strength agent, calcium carbonate or sodium hydrogen carbonate, and a polyamide epichlorohydrin-based wet strength paper strength agent are blended with respect to the entire paperboard layer. This makes it possible to achieve both the solution of the paper delamination problem of multilayer papermaking and acid resistance.
  • JP-A-9-137400 JP-A-6-101200 Japanese Patent Laid-Open No. 5-230792 JP 2006-219775 A
  • Patent Document 1 the use of a specific pulp containing bacterial cellulose is disadvantageous in terms of workability and increases costs.
  • the cost is increased, and when an internal sizing agent for imparting acid resistance is added to the base paper, the bondability between the paper interlayer adhesive and the pulp fiber is deteriorated. The expected improvement is not obtained.
  • the processing suitability required for the paper container cannot be obtained, and the resin layer at the folded portion is broken or the resin layer is broken when an impact such as dropping is applied from the outside.
  • the strength was reduced when an internal sizing agent for imparting acid resistance was added to the base paper of the laminated sheet.
  • the present invention is a laminated sheet in which a multilayer paperboard is used as a base paper and a synthetic resin layer is formed on the surface thereof, and has sufficient bending work resistance and drop impact resistance, and preferably has good printability and contents.
  • the invention according to claim 1 is a paper container base paper used for a laminated sheet for paper container formed by providing a thermoplastic resin layer on the surface of the paper container base paper.
  • the paper container base paper has a multilayer structure composed of a plurality of layers in which an outer layer and an inner layer are formed using a multilayer paper making means,
  • the outer layer has a softwood kraft pulp content in the total raw pulp of 40% by mass or more, and the inner layer has a softwood kraft pulp content in the total raw material pulp of 30% by weight or less. It is.
  • the invention according to claim 2 is the invention according to the paper container base paper according to claim 1, wherein the raw material pulp is composed of blended softwood kraft pulp and hardwood kraft pulp.
  • Invention of Claim 3 is invention concerning the base paper for paper containers of Claim 1 or 2, Comprising: The softwood kraft pulp compounding ratio in all the raw material pulp in paper container base paper is 50 mass% or less It is characterized by.
  • the invention according to claim 4 relates to the paper container base paper according to any one of claims 1 to 3, wherein polyacrylamide having a molecular weight of less than 6 million as an internally added dry paper strength enhancer is contained in the inner layer. It is characterized by containing 0.2 parts by mass or less with respect to 100 parts by mass of all raw pulp (absolutely dry pulp mass).
  • the invention according to claim 5 is the invention according to the paper container base paper according to claim 1, 2, 3 or 4, wherein the alkyl ketene dimer is used as the internal sizing agent, and all the raw pulp 100 in the paper base paper. It is characterized by containing 0.15 parts by mass or more and less than 0.80 parts by mass with respect to parts by mass (absolutely dry pulp mass).
  • the invention described in claim 6 is a laminated sheet for paper containers, in which a thermoplastic resin layer is laminated on both sides of the base paper for paper containers described in any one of claims 1 to 5.
  • the inner layer of the folded part is first destroyed in the folding process in the molding process, and stress such as compression and tension is concentrated on the outermost layer of the folded part, and the resin layer is destroyed. After filling the contents, the resin layer can be prevented from being broken due to an impact such as dropping from the outside. That is, the NKP compounding ratio in the total raw material pulp in the paper layer is 40% by mass or more in the outer layers of the front and back surfaces, and the NKP compounding ratio in the total raw material pulp in the paper layer is 30% by mass or less in all the inner layers.
  • the inner layer of the folded part is first destroyed in the folding process in the molding process, and stress such as compression and tension is concentrated on the outermost layer of the folded part, and the destruction of the resin layer is suppressed.
  • the NKP compounding ratio in the total raw material pulp in the paper layer in each outer layer on the front and back sides is 40% by mass or more, and it is caused by applying an impact such as dropping from the outside after filling the contents. Suppresses the destruction of the resin layer.
  • the blending ratio of NKP in all raw pulps in the outer layer is preferably 50% by mass or more, more preferably 75% by mass or more, and further preferably 90% by mass or more.
  • the laminated sheet for paper containers in which a thermoplastic synthetic resin layer is provided on the paper for paper containers according to the present invention exhibits excellent processability even when the base paper is a paper produced by multilayer papermaking, and further has high definition. It exhibits printability suitable for printing images and high cross-sectional penetration resistance.
  • the person who acquired the paper container base paper which concerns on this invention can select an appropriate thermoplastic synthetic resin, and can process it into the laminated sheet for paper containers in which the surface layer was formed.
  • the laminated sheet can be printed for each container, trimmed, bent, and the like to produce a paper container.
  • the paper container base paper according to the present invention is a base paper having a multilayer structure manufactured by multilayer papermaking.
  • the softwood kraft pulp in the total raw material pulp in the inner layer, which is the paper layer other than the outer layer, and the blend ratio of the softwood kraft pulp in the total raw material pulp in the outer layer, which is the outermost paper layer, is 40% by mass or more.
  • the condition that the mixing ratio is 30% by mass or less is assumed to be satisfied.
  • each of the plurality of inner layers satisfies the above-described conditions.
  • raw material pulp softwood bleached kraft pulp and hardwood bleached kraft pulp are mainly used from the viewpoint of hygiene and prevention of discoloration. However, technically it is not necessary to be restricted to these pulps.
  • the paper container base paper of the present invention is manufactured by making a papermaking raw material mainly composed of wood pulp, a sizing agent, a dry paper strength enhancer, and the like, by multilayer papermaking.
  • Multilayer papermaking in the present invention is a papermaking method in which a sheet having a low basis weight is prepared by various papermaking apparatuses, and the sheets are pressed in several stages and dried, and the method for preparing each single layer is particularly limited. It is not a thing.
  • Various papermaking devices such as long net papermaking, twin wire papermaking, and circular net papermaking can be used as appropriate, but long mesh papermaking and twin wire papermaking are preferred because of good productivity.
  • the raw material pulp used for each layer of the paper container base paper of the present invention contains coniferous kraft pulp (NKP) as an essential component.
  • softwood kraft pulp (NKP) include softwood bleached kraft pulp (NBKP), softwood unbleached kraft pulp (NUKP), and softwood semi-bleached kraft pulp (NSBKP).
  • NKP softwood bleached kraft pulp
  • NUKP softwood unbleached kraft pulp
  • NBSKP softwood semi-bleached kraft pulp
  • LBPKP softwood semi-bleached kraft pulp
  • LBPKP softwood semi-bleached kraft pulp
  • LBPKP hardwood kraft pulp
  • LLBKP hardwood bleached kraft pulp
  • LKP hardwood unbleached kraft pulp
  • LSBKP hardwood semi-bleached kraft pulp
  • wood pulp for example, sulfite pulp such as hardwood sulfite pulp and softwood sulfite pulp; Stone Grand Pulp (SGP), Pressurized Stone Grand Pulp (PGW), Refiner Grand Pulp (RGP), Thermo Grand Pulp (TGP), Chemi-Grand Pulp (CGP), Crushed Wood Pulp (GP), Thermomechanical Pulp (TMP), etc.
  • SGP Stone Grand Pulp
  • PGW Pressurized Stone Grand Pulp
  • RGP Refiner Grand Pulp
  • TGP Thermo Grand Pulp
  • CGP Chemi-Grand Pulp
  • CGP Crushed Wood Pulp
  • TMP Thermomechanical Pulp
  • Waste paper pulp made from office waste paper, corrugated waste paper, Kamihashi waste paper, Kent waste paper, imitation waste paper, waste paper waste paper, etc., disaggregation / deinking waste paper pulp, or waste paper pulp such as disaggregation / deinking waste paper pulp, or Such as non-wood pulp, chemically or mechanically produced from non-wood fibers such as kenaf, hemp, straw Various pulp of knowledge can be used in combination within a range not to impair the effects of the present invention.
  • bleached pulp such as softwood bleached kraft pulp (NBKP) and hardwood bleached kraft pulp (LBKP) from a hygienic viewpoint.
  • NNKP softwood bleached kraft pulp
  • LKP hardwood bleached kraft pulp
  • the base paper for paper containers of the present invention is formed into a paper container by laminating a thermoplastic resin such as polyethylene on the surface, and it is formed into a paper container. is necessary. Further, after filling the contents, it is necessary that the above-described resin layer is not broken even when an impact in a practical range such as dropping is applied from the outside.
  • the base paper for paper containers of the present invention has an NKP compounding ratio of 40% by mass or more in the total raw material pulp in the paper layer in the outer layers on the front and back sides, and an NKP compounding ratio in the total raw material pulp in the paper layer in all the inner layers. 30% by mass or less, the inner layer of the folded part is first destroyed in the bending step in the molding process, and stress such as compression and tension is concentrated on the outermost layer of the folded part. Suppress destruction.
  • the NKP compounding ratio in the total raw material pulp in the paper layer in each outer layer on the front and back sides is 40% by mass or more, and it is caused by applying an impact such as dropping from the outside after filling the contents. Suppresses the destruction of the resin layer.
  • the blending ratio of NKP in all raw pulps in the outer layer is preferably 50% by mass or more, more preferably 75% by mass or more, and further preferably 90% by mass or more. This effectively suppresses the destruction of the resin layer due to the bending of the resin and the destruction of the resin layer due to the impact.
  • ⁇ Printability> In the base paper for paper containers of the present invention, it becomes easy to obtain the above processing suitability by blending a large amount of NKP with strong fiber strength, but the smoothness of the base paper surface is lowered, and a thermoplastic resin is added on the base paper. After the lamination, when printing on the surface, the uniformity of the solid portion is particularly lowered and the sharpness of the printed image is lowered. Therefore, it is not suitable for printing high-definition images rich in design.
  • the above processing suitability is obtained, and high definition It is possible to have good printability suitable for image printing.
  • LKP which is softer than NKP and easy to obtain smoothness, is blended in the inner layer, so that when laying and pressing each single layer in multi-layer paper, the LKP in the inner layer has a cushioning action and has a cushioning effect in the outer layer. Reduces the low smoothness of NKP.
  • each of the plurality of inner layers must satisfy the above-described conditions. Furthermore, by making the NKP compounding ratio in the total raw material pulp in the paper container base paper to be 50% by mass or less, it becomes easier to obtain good printability, which is preferable.
  • the Canadian standard freeness (CSF) of NKP in the raw material pulp mentioned above is 450 ml or more and 600 ml or less
  • the CSF of LKP is 400 ml or more and 550 ml or less.
  • the interfiber bond is appropriately adjusted, and the paper strength necessary for the paper container base paper is obtained as described above.
  • the resin layer can be prevented from breaking during the bending process in the molding process, and the resin layer can be prevented from being broken even when a practical impact such as dropping is applied from the outside after filling the contents. It becomes easy.
  • it becomes easy to obtain the cross-sectional penetration resistance which this invention aimed at it is preferable.
  • the inner layer has as low a strength as possible in order to absorb the distortion generated by the bending stress concentration in the fragile inner layer so as not to be manifested on the film side.
  • a certain degree of strength is required.
  • polyacrylamide having a molecular weight of less than 6 million, and preferably a molecular weight of 100,000 to 4 million is used as an internally added dry paper strength enhancer in the inner layer, and 100 parts by mass of the total raw pulp in the inner layer (mass of dry pulp) ) To 0.2 parts by mass or less.
  • polyacrylamide include those amphotericized by anionic, cationic, and partial cationic modification.
  • polyacrylamide having a molecular weight of less than 6 million as an internally added dry paper strength enhancer, the bond between fibers is increased, and the paper strength necessary for a paper container base paper is easily obtained.
  • the fiber-to-fiber bond is too high, stresses such as compression and tension are concentrated on the outermost layer of the folded part during the bending process in the molding process, and the resin layer is easily broken, so the workability is reduced. To do.
  • the content of the polyacrylamide in all inner layers is 0.2 parts by mass or less with respect to 100 parts by mass of all raw pulp (absolutely dry pulp mass), it is possible to appropriately adjust the inter-fiber bond in the inner layer. Therefore, the inner layer of the folded part is first destroyed in the folding process in the molding process, and stress such as compression and tension is concentrated on the outermost layer of the folded part, and it becomes easy to suppress the destruction of the resin layer. . Even when a starch system such as cationized starch, amphoteric starch or oxidized starch is used as an internally added dry paper strength enhancer, the same effect as polyacrylamide can be obtained by adjusting the interfiber bond appropriately. It is preferable to contain polyacrylamide which can be adjusted appropriately.
  • the paper container base paper of the present invention requires high cross-sectional penetration resistance. Specifically, a low-density polyethylene of 30 ⁇ m in thickness was bonded to both sides of a base paper and a square test piece having a side length of 10.0 cm was used. It is essential that the rate of mass increase when immersed for a period of time is less than 5.0% by mass. If the water penetration distance of the heat seal bonding part exceeds 2.0 mm, it becomes a serious object of complaint. Therefore, in the above test, the original target of the cross-sectional penetration resistance is that the penetration distance of the standard solution is less than 2.0 mm. It is to be.
  • the target value for cross-sectional permeation resistance of the present invention is set from the change in mass of the test piece accompanying the permeation of the standard solution. Assuming that the density of the base paper is 0.75 g / cm 3 and the swelling rate of the base paper when water penetrates is 20%, in order to make the permissible range of the standard solution penetration less than 2.0 mm, the mass due to the penetration of the standard solution It is derived that the increase rate is less than 5.0% by mass. Moreover, as a measurement condition, a test piece is immersed for 5 hours on 23 degreeC conditions, and a mass increase rate is measured. As the aforementioned standard solution, a citric acid aqueous solution having a concentration of 1.0 mass% adjusted to pH 4 corresponding to an acidic food is used.
  • the paper container base paper of the present invention needs to have high cross-sectional penetration resistance, but in order to suppress the penetration of the liquid, the permeable pore diameter is reduced, the continuous pore volume is reduced, the paper base Measures such as increasing the water repellency of the material are effective.
  • the reduction of the pore diameter or the reduction of the continuous pore volume the freeness of the raw material pulp is a dominant factor.
  • the CSF of NKP in the raw pulp is 600 ml or less and the CSF of LKP is 550 ml or less.
  • the NKP CSF exceeds 600 ml or the LKP CSF exceeds 550 ml, the paper layer structure becomes rough, and it is difficult to obtain the cross-sectional penetration resistance targeted by the present invention.
  • the paper container base paper of the present invention has an alkyl ketene dimer as an internally added sizing agent in an amount of 0.15 parts by mass or more and 0.80 parts per 100 parts by mass (absolutely dry pulp mass) of the total raw pulp in the paper container base paper. It is preferable to contain less than part by mass.
  • the alkyl ketene dimer By containing 0.15 parts by mass or more of the alkyl ketene dimer, the aforementioned cross-sectional penetration resistance is improved.
  • the cross-sectional penetration resistance becomes better as the amount of the alkyl ketene dimer added is increased. However, even when 0.80 parts by mass or more is added, the improvement in the cross-sectional penetration resistance has reached its peak and is economically meaningless.
  • an alkyl ketene dimer is preferable because it exhibits sufficient water repellency even under conditions where the pH of the aqueous solution is low, and high sizing properties can be expected even for acidic aqueous solutions.
  • An internal sizing agent such as an alkyl ketene dimer can be contained in any of the paper layers constituting the paper container base paper of the present invention, but is preferably contained in all paper layers.
  • starch such as cationized starch, amphoteric starch, oxidized starch, and / or sulfuric acid band is preferable because it has an effect of improving the fixing of the alkyl ketene dimer to the pulp and the cross-sectional penetration resistance is improved.
  • the paper container base paper of the present invention preferably has a basis weight of 170 g / m 2 or more and less than 350 g / m 2 .
  • the paper container base paper requires paper strength and rigidity for its use, and the basis weight is preferably 170 g / m 2 or more.
  • the basis weight is increased, the paper strength is increased, and the resin layer is not easily broken even when an impact such as dropping is applied from the outside.
  • the basis weight is increased, the radius on the outer side of the folded portion is increased by the thickness of the base paper in the bending process in the forming process, so that the stress applied to the resin layer is increased and the resin layer is easily broken by bending.
  • the basis weight of the paper container base paper of the present invention is preferably less than 350 g / m 2 .
  • the basis weight of the base paper is measured according to JIS P 8124 “Paper and board—Method of measuring basis weight”, and the density is measured according to JIS P 8118 “Paper and board—method of testing thickness and density”.
  • the base paper for paper containers of this invention contains the wet paper strength enhancer represented by the polyamide epichlorohydrin type resin.
  • the wet paper strength enhancer represented by the polyamide epichlorohydrin type resin.
  • the polyamide epichlorohydrin resin is preferable because it has an effect of improving the fixing of the alkyl ketene dimer to the pulp.
  • the content of the wet paper strength enhancer is preferably in the range of 0.1 parts by mass or more and 0.5 parts by mass or less with respect to 100 parts by mass (total dry pulp mass) of the total raw material pulp in the paper container base paper.
  • the wet paper strength enhancer can be contained in any of the paper layers constituting the base paper for paper containers of the present invention, but is preferably contained in all paper layers.
  • the base paper for paper containers of this invention uses an adhesive agent between each paper layer.
  • the interlayer adhesive is not particularly limited, and starch such as cationized starch, amphoteric starch, and oxidized starch, and polyacrylamide can be used as appropriate.
  • the paper container base paper of the present invention includes cationized starch, amphoteric starch, oxidized starch and other starches, polyvinyl alcohol, polyacrylamide, so-called surface sizing agents (styrene / acrylic resins, styrene / maleic acid resins, styrene / Surface sizing treatment can also be performed with a methacrylic acid resin, an olefin resin, an ester resin, or the like.
  • a method for applying the surface sizing agent is not particularly limited, and examples thereof include a size press, a gate roll coater, a pre-metalizing size press, and a calendar size press.
  • the base paper for paper containers of this invention may be provided with the pigment coating layer on the surface.
  • pigments used in the coating layer include calcium carbonate, kaolin clay, talc, titanium dioxide, barium sulfate, synthetic silica, and plastic pigments. Of these pigments, one type can be selected and used. Two or more kinds can be mixed and used.
  • an adhesive agent (binder) of a pigment coating layer It can select suitably from well-known resin.
  • water-soluble polymer adhesives, synthetic emulsion adhesives and the like that can be dissolved or dispersed in water are preferable.
  • water-soluble polymer adhesive examples include starch or a modified product thereof, polyvinyl alcohol and a modified product thereof, and casein.
  • synthetic emulsion adhesive known ones such as acrylic resin emulsion, vinyl acetate resin emulsion, styrene butadiene latex, and urethane resin emulsion can be used.
  • the coating amount is about 5 to 30 g / m 2 per side, and these can be formed as a single layer or two layers or more.
  • the laminated sheet for paper containers of the present invention is formed by laminating a thermoplastic resin layer on the surface of the above-mentioned base paper for paper containers.
  • an anchor coat layer can be provided on the surface of the paper container base paper, or corona discharge treatment can be performed. Since the process is simplified, it is preferable to directly perform corona discharge treatment on the surface of the base paper for paper containers.
  • the resin layer lamination method includes extrusion lamination method, co-extrusion lamination method, dry lamination method, wet lamination method, etc. In order to obtain high adhesion between the thermoplastic resin layer and the paper container base paper, extrusion lamination method is used.
  • the coextrusion laminating method are preferable. It is also preferable to form a multilayer film in combination with the T-die coextrusion method.
  • the resin for forming the thermoplastic resin layer polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), or the like can be used.
  • the thickness of the resin layer in the laminated sheet can be appropriately set according to the purpose, and is, for example, 3 to 100 ⁇ m, preferably 10 to 50 ⁇ m.
  • the formation of the thermoplastic synthetic resin layer can be applied to the base paper for paper containers in accordance with specific contents, surface decoration, and the like. Therefore, additional processing can be performed on the downstream side where the paper container base paper is supplied and provided to the paper container user.
  • a low density polyethylene resin was laminated in a thickness of 30 ⁇ m on both sides of a paper container base paper serving as a substrate by an extrusion laminating method.
  • the obtained laminated sheet for paper containers was cut into a square having a side of 10.0 cm to obtain a test piece.
  • a test piece which is folded in two with the MD axis direction or the CD axis direction as the folding axis is a nip processing device comprising a metal roll / metal roll, the passing direction is perpendicular to the folding axis, the passing speed is 50 m / min, and the nip pressure is 50 kN / m. And pressurized.
  • the MD axis direction is the same direction as the papermaking direction, and the CD axis direction is a direction perpendicular to the papermaking direction (papermaking lateral direction).
  • Double-circle The destruction of a resin layer is not recognized.
  • ⁇ Slight destruction of the resin layer is observed, but only one side is destroyed and there is no practical problem.
  • delta The destruction of the resin layer is recognized and the destruction has spread to both surfaces.
  • X Large destruction of the resin layer is observed.
  • FIG. 1 shows a gable-top type paper container produced using the obtained laminated sheet for paper containers.
  • the side length and height of the bottom surface of the container are 55 mm for the bottom A, 55 mm for the bottom B, and 70 mm for the height C.
  • the paper container is manufactured through the following steps. First, crease line processing is performed on the laminated sheet for paper containers, and blank sheets are formed one by one by punching.
  • ⁇ Mass increase rate when immersed in organic acid aqueous solution> The basis weight of the paper container base paper used as a base material was measured, and a low density polyethylene resin was laminated in a thickness of 30 ⁇ m on both sides of the paper container base paper by an extrusion laminating method.
  • the obtained laminated sheet for paper containers was cut into a square having a side of 10.0 cm to obtain a test piece. After measuring the mass of the test piece, the test piece is immersed in an aqueous citric acid solution having a concentration of 1.0% adjusted to 23 ° C. and pH 4 for 5 hours. After immersion, the aqueous solution adhering to the surface is sufficiently wiped off, and then the mass of the test piece is measured.
  • Mass increase rate ⁇ (mass of test piece after immersion ⁇ mass of test piece before immersion) / mass of base paper for paper container in test piece ⁇ ⁇ 100
  • a low density polyethylene resin was laminated in a thickness of 30 ⁇ m on both sides of a paper container base paper serving as a substrate by an extrusion laminating method.
  • the obtained laminated sheet for paper containers was cut into a square having a side of 10.0 cm to obtain a test piece.
  • the ink for offset printing high echo red made by Toyo Ink Co., Ltd.
  • RI-3 made by Meisei Co., Ltd.
  • Printing was performed at a fill volume of 0.5 ml. After the printing process, the occurrence of unevenness (solid) in the solid portion of the printing part was visually observed and evaluated according to the following criteria.
  • Betamra is seen and is not suitable for printing of a high-definition image.
  • X Betamura is recognized entirely and is not suitable for use as a base paper for paper containers.
  • Example 1 (Outer layer stock slurry A) Canadian standard freeness (CSF) 500 ml of softwood bleached kraft pulp (NBKP) and CSF 450 ml of hardwood bleached kraft pulp (LBKP) were blended at a mass ratio of 40/60 to obtain raw material pulp.
  • CSF Canadian standard freeness
  • NKP softwood bleached kraft pulp
  • LKP hardwood bleached kraft pulp
  • the outer layer paper stock slurry A was adjusted to pH 7.5 with sodium hydroxide.
  • the raw pulp slurry is 0.1 parts by weight of polyacrylamide having a molecular weight of 2.5 million as a dry paper strength enhancer with respect to 100 parts by weight (absolutely dry pulp weight) of the total raw pulp, and the alkyl ketene dimer as the internal additive sizing agent.
  • the outer layer 1 and the outer layer 2 are prepared using the outer layer paper stock slurry A and the basis weight is 49 g / m 2
  • the inner layer 1 is prepared using the inner layer paper material slurry a and the basis weight is 99 g / m 2
  • the outer layer 1, inner layer 1 The basis weight ratio of the outer layer 2 was 25:50:25.
  • the wet paper is coated with 1.0 g / m 2 of oxidized starch as an interlayer adhesive on both sides of the inner layer 1 by spraying, and as shown in FIG.
  • the outer layer 1, the inner layer 1 and the outer layer 2 are stacked in this order from the top. Bonding was done with a press. Next, the obtained paper web was coated with a surface sizing agent solution having an oxidized starch concentration of 4.0% by a calender size press so that the both sides were 1.0 g / m 2, and the basis weight was 200 g / m. 2 A paper container base paper having a density of 0.75 g / cm 3 was obtained.
  • Example 2 The outer layer 1 and the outer layer 2 were adjusted at a basis weight of 79 g / m 2 using the outer layer paper slurry A1 prepared in the same manner as the outer layer paper slurry A, except that NBKP and LBKP were mixed at a mass ratio of 50/50.
  • the inner layer 1 was a paper container base paper having a basis weight of 320 g / m 2 and a density of 0.75 g / cm 3 in the same manner as in Example 1 except that the inner layer paper stock slurry a was used and the basis weight was 159 g / m 2. Obtained.
  • Outer layer 1 and outer layer 2 have 0.3 parts by mass of alkyl ketene dimer as an internal sizing agent for 100 parts by mass of all raw pulp (absolutely dry pulp), and 100 parts by mass of all raw pulp (absolutely dry pulp).
  • outer layer sheet fee slurry A2 prepared in the same manner as outer layer sheet fee slurry A1 was adjusted at a basis weight 79 g / m 2, the inner layer 1 as an internal sizing agent Except for adding 0.3 parts by mass of alkyl ketene dimer to 100 parts by mass of all raw pulp (mass of absolutely dry pulp) and adding 0.08 parts by mass of sulfuric acid band to 100 parts by mass of all raw material pulp (mass of absolutely dry pulp).
  • Example 4 The outer layer 1 and the outer layer 2 were prepared in the same manner as in Example 1 except that the outer layer paper stock slurry A1 was used and the basis weight was 62 g / m 2 , and the inner layer 1 was prepared using the inner layer paper stock slurry a and the basis weight was 123 g / m 2. Thus, a paper container base paper having a basis weight of 250 g / m 2 and a density of 0.75 g / cm 3 was obtained.
  • Example 5 The outer layer 1 and the outer layer 2 were prepared in the same manner as in Example 1 except that the outer layer paper stock slurry A1 was used and the basis weight was 49 g / m 2 , and the inner layer 1 was prepared using the inner layer paper stock slurry a and the basis weight was 99 g / m 2.
  • a paper container base paper having a basis weight of 200 g / m 2 and a density of 0.75 g / cm 3 was obtained.
  • the outer layer 1 and the outer layer 2 have a basis weight of 63 g / m 2 using the outer layer paper stock slurry A3 prepared in the same manner as the outer layer paper stock slurry A except that NBKP and LBKP were blended at a mass ratio of 75/25.
  • 1 was prepared using the inner layer paper stock slurry a at a basis weight of 191 g / m 2 , and the basis weight ratio of the outer layer 1, the inner layer 1 and the outer layer 2 was 20:60:20.
  • a paper container base paper having an amount of 320 g / m 2 and a density of 0.75 g / cm 3 was obtained.
  • Example 7 The outer layer 1 and the outer layer 2 are prepared using the outer layer paper slurry A3 and the basis weight is 49 g / m 2 , the inner layer 1 is prepared using the inner layer paper slurry a and the basis weight is 149 g / m 2. 1.
  • the outer layer 1 and the outer layer 2 have the basis weight of 63 g / m 2 using the outer layer paper slurry A3, and the inner layer 1 is the same as the inner layer paper slurry a except that NBKP and LBKP are mixed at a mass ratio of 30/70.
  • the basis weight was adjusted to 191 g / m 2 using the produced inner layer paper material slurry a2, and the basis weight ratio of the outer layer 1, the inner layer 1, and the outer layer 2 was set to 20:60:20.
  • a paper container base paper having a basis weight of 320 g / m 2 and a density of 0.75 g / cm 3 was obtained.
  • Example 9 Outer 1 and the outer layer 2 a basis weight using the outer layer sheet fee slurry A3 in 79 g / m 2, except the inner layer 1 to the basis weight by using an inner layer sheet fee slurry a2 was prepared in 151 g / m 2
  • Example 1 In the same manner, a paper container base paper having a basis weight of 320 g / m 2 and a density of 0.75 g / cm 3 was obtained.
  • the outer layer 1 and the outer layer 2 have a basis weight of 63 g / m 2 using an outer layer paper stock slurry A4 prepared in the same manner as the outer layer paper stock slurry A except that NBKP and LBKP were blended at a mass ratio of 90/10.
  • 1 was prepared using the inner layer paper stock slurry a at a basis weight of 191 g / m 2 , and the basis weight ratio of the outer layer 1, the inner layer 1 and the outer layer 2 was 20:60:20.
  • a paper container base paper having an amount of 320 g / m 2 and a density of 0.75 g / cm 3 was obtained.
  • Example 11 The outer layer 1 and outer layer 2 were prepared in the same manner as in Example 1 except that the outer layer paper slurry A4 was used and the basis weight was 79 g / m 2 , and the inner layer 1 was prepared using the inner layer paper material slurry a and the basis weight was 159 g / m 2.
  • Example 12 (Outer layer stock slurry B) CSF 500 ml of NBKP and CSF 450 ml of LBKP were blended at a mass ratio of 75/25 to obtain raw material pulp.
  • the raw pulp slurry 0.3 parts by mass of polyacrylamide having a molecular weight of 2.5 million as a dry paper strength enhancer with respect to 100 parts by mass (absolutely dry pulp mass) of the total raw pulp, and alkyl ketene dimer as an internal sizing agent 0.5 parts by mass with respect to 100 parts by mass (absolutely dry pulp), 0.1 parts by mass of polyamide epichlorohydrin resin as a wet paper strength enhancer with respect to 100 parts by mass of all raw pulp (absolutely dry pulp)
  • the outer layer paper stock slurry B was adjusted to pH 7.5 with sodium hydroxide.
  • the raw pulp slurry is 0.2 parts by weight of polyacrylamide having a molecular weight of 2.5 million as a dry paper strength enhancer with respect to 100 parts by weight (absolutely dry pulp weight) of the total raw pulp, and the alkyl ketene dimer is used as the internal sizing agent.
  • the raw pulp slurry is 0.1 parts by weight of polyacrylamide having a molecular weight of 2.5 million as a dry paper strength enhancer with respect to 100 parts by weight (absolutely dry pulp weight) of the total raw pulp, and the alkyl ketene dimer as the internal additive sizing agent. 0.5 parts by mass with respect to 100 parts by mass (absolutely dry pulp), 0.1 parts by mass of polyamide epichlorohydrin resin as a wet paper strength enhancer with respect to 100 parts by mass of all raw pulp (absolutely dry pulp) After the addition, the pH was adjusted to 7.5 with sodium hydroxide to obtain an inner layer paper slurry c.
  • outer layer 1 and outer layer 2 use outer layer paper stock slurry B, basis weight is 62 g / m 2
  • inner layer 1 and inner layer 3 use inner layer paper stock slurry b
  • basis weight is 31 g / m 2
  • inner layer 2 is inner layer paper stock
  • the basis weight was adjusted to 127 g / m 2 using the slurry c, and the basis weight ratio of the outer layer 1, the inner layer 1, the inner layer 2, the inner layer 3 and the outer layer 2 was 20: 10: 40: 10: 20.
  • the wet paper was coated with 1.0 g / m 2 of oxidized starch as an interlayer adhesive on both sides of the inner layer 1, the inner layer 2 and the inner layer 3 by spraying, and as shown in FIG. 3, the outer layer 1, the inner layer 1, The inner layer 2, the inner layer 3, and the outer layer 2 were stacked in this order and bonded together by a press.
  • the obtained paper web was coated with a surface sizing agent solution having an oxidized starch concentration of 4.0% by a calender size press so that the both sides were 1.0 g / m 2, and the basis weight was 320 g / m. 2
  • a paper container base paper having a density of 0.75 g / cm 3 was obtained.
  • the outer layer 1 and the outer layer 2 have the basis weight of 49 g / m 2 using the outer layer paper slurry B, the inner layer 1 and the inner layer 3 have the basis weight of 24 g / m 2 using the inner layer paper slurry b, and the inner layer 2 is the inner layer paper.
  • a paper container base paper having a basis weight of 250 g / m 2 and a density of 0.75 g / cm 3 was obtained in the same manner as in Example 12 except that the basis weight was adjusted to 97 g / m 2 using the material slurry c.
  • the outer layer 1 and the outer layer 2 use the outer layer paper slurry B, and the basis weight is 62 g / m 2.
  • the inner layer 1 and the inner layer 3 are the same as the inner layer paper slurry b except that NBKP and LBKP are mixed at a mass ratio of 30/70.
  • the inner layer 2 has a basis weight of 31 g / m 2
  • the inner layer 2 is an inner layer paper except that CSF 600 ml of NBKP and CSF 500 ml of LBKP are blended at a mass ratio of 10/90 as raw material pulp.
  • Example 15 The outer layer 1 and the outer layer 2 use the outer layer paper slurry B, and the basis weight is 48 g / m 2.
  • the inner layer 1 and the inner layer 3 use the inner layer paper slurry b1, the basis weight is 24 g / m 2 , and the inner layer 2 is the inner layer paper material.
  • a paper container base paper having a basis weight of 250 g / m 2 and a density of 0.75 g / cm 3 was obtained in the same manner as in Example 12 except that the basis weight was prepared at 99 g / m 2 using the slurry c1.
  • Outer layer 1 and outer layer 2 use outer layer paper slurry B and have a basis weight of 94 g / m 2
  • inner layer 1 and inner layer 3 use inner layer paper material slurry b1 and have a basis weight of 47 g / m 2
  • inner layer 2 has an inner layer paper material.
  • the basis weight ratio of the outer layer 1, the inner layer 1, the inner layer 2, the inner layer 3 and the outer layer 2 was set to 30: 15: 10: 15: 30 using the slurry c1 at a basis weight of 31 g / m 2.
  • a paper container base paper having a basis weight of 320 g / m 2 and a density of 0.75 g / cm 3 was obtained.
  • the outer layer 1 and the outer layer 2 have a basis weight of 62 g / m 2 using the outer layer paper material slurry B1 produced in the same manner as the outer layer paper material slurry B except that NBKP and LBKP are blended at a mass ratio of 90/10.
  • Inner layer 1 and inner layer 3 use inner layer paper stock slurry b and have a basis weight of 31 g / m 2.
  • Inner layer 2 is the same as inner layer paper stock slurry c1 except that NBKP and LBKP are blended at a mass ratio of 15/85.
  • a paper container base paper having a basis weight of 320 g / m 2 and a density of 0.75 g / cm 3 was obtained in the same manner as in Example 12 except that the basis weight was adjusted to 127 g / m 2 using the inner layer paper material slurry c2 prepared in the above manner. Obtained.
  • Example 18 (Outer layer stock slurry C) Canadian standard freeness (CSF) 550 ml of softwood kraft pulp (NBKP) and CSF 450 ml of hardwood kraft pulp (LBKP) were blended at a mass ratio of 75/25 to obtain raw material pulp.
  • CSF Canadian standard freeness
  • NKP softwood kraft pulp
  • LKP hardwood kraft pulp
  • the outer layer paper stock slurry C was prepared by adjusting the pH to 7.5 with sodium hydroxide.
  • (Inner layer paper slurry d) CSF 550 ml of LBKP was used as a raw material pulp.
  • the raw pulp slurry is 0.1 parts by weight of polyacrylamide having a molecular weight of 2.5 million as a dry paper strength enhancer with respect to 100 parts by weight (absolutely dry pulp weight) of the total raw pulp, and the alkyl ketene dimer as the internal additive sizing agent.
  • the inner layer 1 is prepared in a basis weight of 119 g / m 2 by using the inner layer sheet fee slurry B, the outer layer 1, an inner layer 1, the outer layer A base paper having a basis weight of 200 g / m 2 and a density of 0.75 g / cm 3 was obtained in the same manner as in Example 1 except that the basis weight ratio of 2 was 20:60:20.
  • this base paper On the front and back surfaces of this base paper, 60 parts by mass of Ultra White 90 (clay, manufactured by Engelhard), 40 parts by mass of Brilliant 15 (light calcium carbonate, manufactured by Shiraishi Kogyo Co., Ltd.), and pigment 100
  • a pigment coating solution containing 16 parts by mass of Nipol LX407F (modified styrene / butadiene copolymer latex, manufactured by Nippon Zeon Co., Ltd.) per bar is dried by bar coating, and a pigment coating amount of 15 g / m 2 is applied.
  • a coated layer was provided on the front and back surfaces, and a coated paper type paper container base paper having a basis weight of 230 g / m 2 was produced.
  • Example 19 (Outer layer paper material slurry C1) Canadian standard freeness (CSF) 550 ml of softwood kraft pulp (NBKP) and CSF 450 ml of hardwood kraft pulp (LBKP) were blended at a mass ratio of 75/25 to obtain raw material pulp. 0.1 parts by mass of polyacrylamide having a molecular weight of 2.5 million as a dry paper strength enhancer to 100 parts by mass (absolutely dry pulp mass) of the total raw material pulp and 100 masses of total raw material pulp as an internal sizing agent.
  • CSF Canadian standard freeness
  • NKP softwood kraft pulp
  • LKP hardwood kraft pulp
  • rosin as an internal sizing agent is 0.75 parts by mass with respect to 100 parts by mass of the total raw material pulp (absolutely dry pulp mass), and the sulfuric acid band is 0 with respect to 100 parts by mass of the total raw material pulp (absolutely dry pulp mass).
  • the inner layer paper stock slurry d1 was adjusted to pH 7.5 with sodium hydroxide.
  • the outer layer 1 and the outer layer 2 are prepared using the outer layer paper stock slurry B at a basis weight of 39 g / m 2
  • the inner layer 1 is prepared using the inner layer paper stock slurry B at a basis weight of 119 g / m 2
  • the outer layer 1, the inner layer 1 and the outer layer are prepared.
  • a base paper having a basis weight of 200 g / m 2 and a density of 0.75 g / cm 3 was obtained in the same manner as in Example 1 except that the basis weight ratio of 2 was 20:60:20.
  • a pigment coating layer was provided on the front and back surfaces of this base paper in the same manner as in Example 18 to prepare a coated paper type paper container base paper having a basis weight of 230 g / m 2 .
  • the outer layer 1 and the outer layer 2 were produced in the same manner as the outer layer paper stock slurry A except that NBKP and LBKP were mixed at a mass ratio of 20/80, and the basis weight was 62 g / m 2 using the outer layer paper stock slurry A5.
  • the inner layer 1 was prepared at a basis weight of 123 g / m 2 using an inner layer paper slurry a3 prepared in the same manner as the inner layer paper slurry a except that NBKP and LBKP were blended at a mass ratio of 20/80.
  • a paper container base paper having a basis weight of 250 g / m 2 and a density of 0.75 g / cm 3 was obtained in the same manner as in Example 1 except that the basis weight ratio of 1, inner layer 1 and outer layer 2 was 25:50:25.
  • the outer layer 1 and the outer layer 2 have an basis weight of 79 g / m 2 using an outer layer paper stock slurry A6 prepared in the same manner as the outer layer paper stock slurry A except that NBKP and LBKP are mixed at a mass ratio of 15/85.
  • 1 is prepared using an inner layer stock slurry a4 prepared in the same manner as the inner layer stock slurry a4 except that NBKP and LBKP are mixed at a mass ratio of 50/50, and the basis weight is 159 g / m 2 .
  • a paper container base paper having a basis weight of 320 g / m 2 and a density of 0.75 g / cm 3 was obtained in the same manner as in Example 1 except that the basis weight ratio of the inner layer 1 and the outer layer 2 was 25:50:25.
  • the outer layer 1 and the outer layer 2 are prepared using the outer layer paper slurry A6 and the basis weight is 62 g / m 2.
  • the inner layer 1 is prepared using the inner layer paper slurry a4 and the basis weight is 123 g / m 2 .
  • a paper container base paper having a basis weight of 250 g / m 2 and a density of 0.75 g / cm 3 was obtained in the same manner as in Example 1 except that the basis weight ratio of the outer layer 2 was 25:50:25.
  • the outer layer 1 and the outer layer 2 have a basis weight of 79 g / m 2 using an outer layer paper stock slurry A7 prepared in the same manner as the outer layer paper stock slurry A except that NBKP and LBKP are mixed at a mass ratio of 30/70.
  • No. 1 was prepared in the same manner as in Example 1 except that the basis weight of the inner layer paper material slurry a4 was adjusted to 159 g / m 2 and the basis weight ratio of the outer layer 1, the inner layer 1 and the outer layer 2 was set to 25:50:25.
  • a paper container base paper having a basis weight of 320 g / m 2 and a density of 0.75 g / cm 3 was obtained.
  • the outer layer 1 and the outer layer 2 have an basis weight of 62 g / m 2 using an outer layer paper stock slurry A7 prepared in the same manner as the outer layer paper stock slurry A except that NBKP and LBKP are mixed at a mass ratio of 30/70.
  • No. 1 was prepared in the same manner as in Example 1 except that the inner layer paper stock slurry a4 was used and the basis weight was 123 g / m 2 and the basis weight ratio of the outer layer 1, the inner layer 1 and the outer layer 2 was 25:50:25.
  • a paper container base paper having a basis weight of 250 g / m 2 and a density of 0.75 g / cm 3 was obtained.
  • the outer layer 1 and the outer layer 2 have a basis weight of 79 g / m 2 using an outer layer paper slurry A8 produced in the same manner as the outer layer paper slurry A, except that NBKP and LBKP were mixed at a mass ratio of 50/50.
  • No. 1 was prepared in the same manner as in Example 1 except that the basis weight was adjusted to 159 g / m 2 using the inner layer paper stock slurry a4, and the basis weight ratio of the outer layer 1, the inner layer 1 and the outer layer 2 was 25:50:25.
  • a paper container base paper having a basis weight of 320 g / m 2 and a density of 0.75 g / cm 3 was obtained.
  • the outer layer 1 and the outer layer 2 have a basis weight of 79 g / m 2 using the outer layer paper stock slurry A3, and the inner layer 1 is the same as the inner layer paper stock slurry a except that NBKP and LBKP are blended at a mass ratio of 40/60.
  • a basis weight was prepared in the same manner as in Example 1 except that the basis weight 159 g / m 2 was prepared using the prepared inner layer paper slurry a5, and the basis weight ratio of the outer layer 1, the inner layer 1 and the outer layer 2 was 25:50:25.
  • a paper container base paper having an amount of 320 g / m 2 and a density of 0.75 g / cm 3 was obtained.
  • the outer layer 1 and the outer layer 2 are prepared with an outer layer paper stock slurry A4 and a basis weight of 79 g / m 2
  • the inner layer 1 is prepared with an inner layer paper stock slurry a5 and a basis weight of 159 g / m 2.
  • a paper container base paper having a basis weight of 320 g / m 2 and a density of 0.75 g / cm 3 was obtained in the same manner as in Example 1 except that the basis weight ratio of the outer layer 2 was 25:50:25.
  • the outer layer 1 and the outer layer 2 have a basis weight of 63 g / m 2 using an outer layer stock slurry B3 prepared in the same manner as the outer layer stock slurry B except that NBKP and LBKP are blended at a mass ratio of 50/50.
  • 1 and the inner layer 3 have a basis weight of 62 g / m 2 using the inner layer paper material slurry b2 prepared in the same manner as the inner layer paper material slurry b except that NBKP and LBKP were mixed at a mass ratio of 50/50.
  • the basis weight ratio of the inner layer 2, the inner layer 3, and the outer layer 2 is the same as that of Example 12 except that the basis weight ratio is 20: 20: 20: 20: 20.
  • the basis weight is 320 g / m 2 and the density is 0.75 g / cm 3 .
  • a paper container base paper was obtained.
  • the paper container base paper of the present invention provides a laminated sheet for paper containers laminated with a thermoplastic resin having good processability and cross-sectional penetration resistance and good printability. It was.
  • the resin layer was destroyed by bending in the molding process (Comparative Examples 1 to 4), or after filling the contents, an impact such as dropping was applied from the outside. If this occurs, the resin layer will be destroyed (Comparative Examples 1 to 5), and the processability will be poor. Alternatively, the processability was good but the printability was inferior (Comparative Examples 6 to 9), and Comparative Examples 1 to 9 did not have sufficient performance as base paper for paper containers.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Paper (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)

Abstract

L'invention porte sur un papier support pour un contenant en papier, sur lequel une résine en matière thermoplastique est stratifiée, ayant une bonne aptitude au traitement, une résistance élevée à la pénétration en section transversale et une bonne aptitude à l'impression. L'invention porte de façon spécifique sur un papier support multicouche pour un contenant en papier, comprenant une couche externe, qui est une couche de papier située la plus à l'extérieur, et une couche interne, qui est une couche de papier autre que la couche externe, la couche externe contenant, dans le matériau de pâte de départ de celle-ci, 40 % en masse ou plus d'une pâte de bois de résineux, et la couche interne contenant, dans le matériau de pâte de départ de celle-ci, 30 % en masse ou moins d'une pâte de bois de résineux.
PCT/JP2010/055530 2009-03-31 2010-03-29 Papier support pour contenant en papier et feuille stratifiée pour contenant en papier utilisant celui-ci Ceased WO2010113849A1 (fr)

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JP2011507176A JP5563557B2 (ja) 2009-03-31 2010-03-29 紙容器用原紙及びこれを用いた紙容器用積層シート
CN2010800144563A CN102369324A (zh) 2009-03-31 2010-03-29 纸容器用原纸及使用该纸容器用原纸的纸容器用层压片材

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JP2015218422A (ja) * 2014-05-21 2015-12-07 北越紀州製紙株式会社 多層抄き紙
JP2016125160A (ja) * 2014-12-26 2016-07-11 大王製紙株式会社 プレスポケット型キャリアテープ用原紙
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JP2018000149A (ja) * 2016-07-06 2018-01-11 日本製紙株式会社 組立式燻製ボックス
JP2018031092A (ja) * 2016-08-24 2018-03-01 大王製紙株式会社 耐水耐油紙及び紙製容器
JP2020019551A (ja) * 2018-08-02 2020-02-06 王子ホールディングス株式会社 容器用原紙および該容器用原紙を用いた紙容器
JP2020172085A (ja) * 2019-04-12 2020-10-22 王子ホールディングス株式会社 カップ用基材、液体用カップ容器およびその製造方法
JP2020172086A (ja) * 2019-04-12 2020-10-22 王子ホールディングス株式会社 液体容器用基材、液体用容器およびその製造方法
JP2020196990A (ja) * 2020-08-20 2020-12-10 大王製紙株式会社 食器用塗工紙及び紙製食器
JP2021080625A (ja) * 2021-03-01 2021-05-27 大王製紙株式会社 耐水耐油紙
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WO2025184929A1 (fr) * 2024-03-07 2025-09-12 金红叶纸业(南通)有限公司 Substrat en papier et son procédé de préparation et emballage souple à base de papier

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