JP6149589B2 - Container base paper and method for producing the container base paper - Google Patents
Container base paper and method for producing the container base paper Download PDFInfo
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- JP6149589B2 JP6149589B2 JP2013163792A JP2013163792A JP6149589B2 JP 6149589 B2 JP6149589 B2 JP 6149589B2 JP 2013163792 A JP2013163792 A JP 2013163792A JP 2013163792 A JP2013163792 A JP 2013163792A JP 6149589 B2 JP6149589 B2 JP 6149589B2
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- paper
- coating layer
- container
- base paper
- pigment
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- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 239000011247 coating layer Substances 0.000 claims description 108
- 239000000049 pigment Substances 0.000 claims description 85
- 239000010410 layer Substances 0.000 claims description 69
- 238000000576 coating method Methods 0.000 claims description 46
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 45
- 239000011248 coating agent Substances 0.000 claims description 42
- 239000000463 material Substances 0.000 claims description 31
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 22
- 229920002873 Polyethylenimine Polymers 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 19
- 239000007787 solid Substances 0.000 claims description 19
- 239000000758 substrate Substances 0.000 claims description 17
- 239000003232 water-soluble binding agent Substances 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 14
- 239000005995 Aluminium silicate Substances 0.000 claims description 13
- 235000012211 aluminium silicate Nutrition 0.000 claims description 13
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 13
- 229920002472 Starch Polymers 0.000 claims description 11
- 235000019698 starch Nutrition 0.000 claims description 11
- 239000008107 starch Substances 0.000 claims description 9
- 229920001131 Pulp (paper) Polymers 0.000 claims description 7
- 239000005018 casein Substances 0.000 claims description 5
- BECPQYXYKAMYBN-UHFFFAOYSA-N casein, tech. Chemical compound NCCCCC(C(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(CC(C)C)N=C(O)C(CCC(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(C(C)O)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(COP(O)(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(N)CC1=CC=CC=C1 BECPQYXYKAMYBN-UHFFFAOYSA-N 0.000 claims description 5
- 235000021240 caseins Nutrition 0.000 claims description 5
- 229940088417 precipitated calcium carbonate Drugs 0.000 claims 1
- 239000000123 paper Substances 0.000 description 149
- 239000002585 base Substances 0.000 description 91
- 239000003973 paint Substances 0.000 description 37
- 239000004816 latex Substances 0.000 description 27
- 229920000126 latex Polymers 0.000 description 27
- 229920005992 thermoplastic resin Polymers 0.000 description 21
- 238000002360 preparation method Methods 0.000 description 16
- 238000012545 processing Methods 0.000 description 13
- 238000007646 gravure printing Methods 0.000 description 12
- 238000009499 grossing Methods 0.000 description 12
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- 229920001577 copolymer Polymers 0.000 description 11
- -1 derivatives thereof Substances 0.000 description 10
- 239000003795 chemical substances by application Substances 0.000 description 9
- 239000001254 oxidized starch Substances 0.000 description 9
- 235000013808 oxidized starch Nutrition 0.000 description 9
- 206010016807 Fluid retention Diseases 0.000 description 8
- 239000007864 aqueous solution Substances 0.000 description 8
- 239000000428 dust Substances 0.000 description 8
- 238000007639 printing Methods 0.000 description 8
- 238000005336 cracking Methods 0.000 description 7
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- 235000014113 dietary fatty acids Nutrition 0.000 description 6
- 238000001035 drying Methods 0.000 description 6
- 239000000194 fatty acid Substances 0.000 description 6
- 229930195729 fatty acid Natural products 0.000 description 6
- 235000013305 food Nutrition 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 229920003048 styrene butadiene rubber Polymers 0.000 description 6
- 239000004372 Polyvinyl alcohol Substances 0.000 description 5
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- 230000000694 effects Effects 0.000 description 5
- 150000004665 fatty acids Chemical class 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 229920002451 polyvinyl alcohol Polymers 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000499 gel Substances 0.000 description 4
- 229920002401 polyacrylamide Polymers 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000013055 pulp slurry Substances 0.000 description 4
- 238000004513 sizing Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 235000013618 yogurt Nutrition 0.000 description 4
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 3
- 239000004902 Softening Agent Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 3
- 230000032798 delamination Effects 0.000 description 3
- 239000003623 enhancer Substances 0.000 description 3
- 235000015243 ice cream Nutrition 0.000 description 3
- 239000002736 nonionic surfactant Substances 0.000 description 3
- 239000010893 paper waste Substances 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 150000005846 sugar alcohols Chemical class 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 3
- RNIHAPSVIGPAFF-UHFFFAOYSA-N Acrylamide-acrylic acid resin Chemical compound NC(=O)C=C.OC(=O)C=C RNIHAPSVIGPAFF-UHFFFAOYSA-N 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 239000002174 Styrene-butadiene Substances 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 150000001298 alcohols Chemical class 0.000 description 2
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 2
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 2
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical group C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 235000020965 cold beverage Nutrition 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000007850 fluorescent dye Substances 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 239000011121 hardwood Substances 0.000 description 2
- 235000012171 hot beverage Nutrition 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 239000002655 kraft paper Substances 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 229920001684 low density polyethylene Polymers 0.000 description 2
- 239000004702 low-density polyethylene Substances 0.000 description 2
- 239000011087 paperboard Substances 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 229920001225 polyester resin Polymers 0.000 description 2
- 239000004645 polyester resin Substances 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000011115 styrene butadiene Substances 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- 239000004408 titanium dioxide Substances 0.000 description 2
- LNAZSHAWQACDHT-XIYTZBAFSA-N (2r,3r,4s,5r,6s)-4,5-dimethoxy-2-(methoxymethyl)-3-[(2s,3r,4s,5r,6r)-3,4,5-trimethoxy-6-(methoxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6r)-4,5,6-trimethoxy-2-(methoxymethyl)oxan-3-yl]oxyoxane Chemical compound CO[C@@H]1[C@@H](OC)[C@H](OC)[C@@H](COC)O[C@H]1O[C@H]1[C@H](OC)[C@@H](OC)[C@H](O[C@H]2[C@@H]([C@@H](OC)[C@H](OC)O[C@@H]2COC)OC)O[C@@H]1COC LNAZSHAWQACDHT-XIYTZBAFSA-N 0.000 description 1
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 description 1
- ROGIWVXWXZRRMZ-UHFFFAOYSA-N 2-methylbuta-1,3-diene;styrene Chemical compound CC(=C)C=C.C=CC1=CC=CC=C1 ROGIWVXWXZRRMZ-UHFFFAOYSA-N 0.000 description 1
- PYSRRFNXTXNWCD-UHFFFAOYSA-N 3-(2-phenylethenyl)furan-2,5-dione Chemical compound O=C1OC(=O)C(C=CC=2C=CC=CC=2)=C1 PYSRRFNXTXNWCD-UHFFFAOYSA-N 0.000 description 1
- YAXXOCZAXKLLCV-UHFFFAOYSA-N 3-dodecyloxolane-2,5-dione Chemical class CCCCCCCCCCCCC1CC(=O)OC1=O YAXXOCZAXKLLCV-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N Acrylic acid Chemical compound OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 241000218631 Coniferophyta Species 0.000 description 1
- 229920002261 Corn starch Polymers 0.000 description 1
- 229920001353 Dextrin Polymers 0.000 description 1
- 239000004375 Dextrin Substances 0.000 description 1
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 description 1
- 239000001856 Ethyl cellulose Substances 0.000 description 1
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 1
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 1
- 108010010803 Gelatin Proteins 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 229920000147 Styrene maleic anhydride Polymers 0.000 description 1
- 125000005396 acrylic acid ester group Chemical group 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000007754 air knife coating Methods 0.000 description 1
- 150000001447 alkali salts Chemical class 0.000 description 1
- 125000002947 alkylene group Chemical group 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000008120 corn starch Substances 0.000 description 1
- 229940099112 cornstarch Drugs 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000007766 curtain coating Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 235000019425 dextrin Nutrition 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 235000019325 ethyl cellulose Nutrition 0.000 description 1
- 229920001249 ethyl cellulose Polymers 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 235000011852 gelatine desserts Nutrition 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 description 1
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 description 1
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 description 1
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000001023 inorganic pigment Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229920001179 medium density polyethylene Polymers 0.000 description 1
- 239000004701 medium-density polyethylene Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920003145 methacrylic acid copolymer Polymers 0.000 description 1
- 229940117841 methacrylic acid copolymer Drugs 0.000 description 1
- 125000005397 methacrylic acid ester group Chemical group 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000012860 organic pigment Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000013054 paper strength agent Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000962 poly(amidoamine) Polymers 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920001281 polyalkylene Polymers 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 1
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 1
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 235000010413 sodium alginate Nutrition 0.000 description 1
- 239000000661 sodium alginate Substances 0.000 description 1
- 229940005550 sodium alginate Drugs 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 239000011122 softwood Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
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Landscapes
- Wrappers (AREA)
- Paper (AREA)
Description
本発明は、紙基材の容器として外面となる側に顔料塗工層を有する容器用原紙に関するものである。 The present invention relates to a container base paper having a pigment coating layer on the outer surface side as a container of a paper substrate.
従来より、アイスクリームやヨーグルト等を充填する容器には、割れない、軽量、焼却が可能といった点から、紙基材が広く利用されている。容器用原紙は、一方の面には印刷が施され、少なくとも他方の面には熱可塑性樹脂層が設けられた積層シートに加工される。その後、容器として成形するために、積層シートに折り曲げ用の罫線加工と容器形状に合わせた打ち抜き加工がおこなわれ、積層シートに入れられた罫線に沿って折り曲げ、組み立てられる。 Conventionally, paper base materials have been widely used for containers filled with ice cream, yogurt or the like because they do not break, are lightweight, and can be incinerated. The container base paper is processed into a laminated sheet in which printing is performed on one side and a thermoplastic resin layer is provided on at least the other side. Then, in order to form as a container, the laminated sheet is subjected to folding ruled line processing and punching processing in accordance with the container shape, and is folded and assembled along the ruled line placed in the laminated sheet.
上記したように、容器は多くの工程を経て加工されるため、使用される容器用原紙には様々な特性が求められる。まず、充填した内容物の紙基材への浸透や、漏れを防止するために、熱可塑性樹脂層にはクラック、厚薄ムラがないこと、紙基材から剥がれ落ちないこと等、高い熱可塑性樹脂層の形成性、密着性が求められる。また、容器用原紙は、罫線加工、打ち抜き、折り曲げ加工がおこなわれるため、これらの加工に対して割れ、紙粉の発生も抑制する必要がある。さらに、容器表面には印刷が施されるが、商品の差別化、広告機能を充実させるため、高い印刷適性が求められる。 As described above, since the container is processed through many steps, various properties are required for the container base paper to be used. First, in order to prevent the filled contents from penetrating into the paper base material and leaking, the thermoplastic resin layer is free of cracks, thickness unevenness, and does not peel off from the paper base material. Layer formability and adhesion are required. Further, since the container base paper is subjected to ruled line processing, punching, and bending processing, it is necessary to suppress the generation of cracks and paper dust in these processing. Furthermore, the container surface is printed, but high printability is required in order to enhance product differentiation and advertising functions.
これらの特性を付与するため、３層の紙層からなり、層の重量比と内部結合強さを規定した液体容器用原紙が提案されている（特許文献１）。しかしながら、この提案では、折り曲げ加工等に対して割れ、紙粉の発生は抑制できる可能性はあるものの、印刷品質、熱可塑性樹脂層の形成性、密着性に関し、充分満足できるものは得られない。 In order to impart these characteristics, a liquid container base paper has been proposed which is composed of three paper layers and defines the weight ratio of the layers and the internal bond strength (Patent Document 1). However, in this proposal, although there is a possibility that cracking and generation of paper dust can be suppressed with respect to the bending process or the like, a sufficiently satisfactory one in terms of print quality, formability of the thermoplastic resin layer, and adhesion cannot be obtained. .
印刷品質を向上させるため、二酸化チタンを配合した塗工層を２層設けた塗工白板紙が提案されている（特許文献２）。しかしながら、この提案では、印刷品質は向上するものの、容器用原紙特有の加工に供されるものではないため、折り曲げ加工等による割れ、紙粉の抑制、熱可塑性樹脂層の形成性、密着性に対する特性は付与されていない。 In order to improve printing quality, a coated white paperboard provided with two coating layers containing titanium dioxide has been proposed (Patent Document 2). However, in this proposal, although the printing quality is improved, it is not used for processing peculiar to the base paper for containers. Therefore, cracking due to bending, etc., suppression of paper dust, formability of thermoplastic resin layer, adhesion No properties are given.
また顔料、バインダー等を含有する塗工層を設け、印刷適性を向上させた食品用途の加工用紙、紙器原紙が提案されている（特許文献３、４）。しかしながら、これらの提案では、印刷品質は向上する可能性はあるものの、折り曲げ加工等による割れ、紙粉の抑制は充分なものではなく、熱可塑性樹脂層の形成性、密着性に関しても、満足できるものは得られない。 In addition, a processed paper for paper use and a paper base paper having a coating layer containing a pigment, a binder and the like to improve printability have been proposed (Patent Documents 3 and 4). However, with these proposals, although there is a possibility that the printing quality may be improved, cracks due to bending and the like, and suppression of paper dust are not sufficient, and the formability and adhesion of the thermoplastic resin layer are satisfactory. You can't get anything.
このように、容器用原紙に求められる様々な特性を、高次元で両立、満足すべきものは、いまだ得られていないのが現状である。 As described above, the present situation is that the various characteristics required for the container base paper are not yet obtained in a high dimension.
本発明は、印刷適性、熱可塑性樹脂層の形成性、密着性、及び製造、加工時における割れ、紙粉の抑制性に優れた容器用原紙及びその容器用原紙の製造方法を提供することを主な目的とする。 The present invention provides a base paper for containers excellent in printability, formability of thermoplastic resin layer, adhesion, and cracking during processing and processing, and suppression of paper dust, and a method for manufacturing the base paper for containers. Main purpose.
本発明者等は、容器用原紙の印刷適性、熱可塑性樹脂層の形成性、密着性、及び製造、加工時における割れ、紙粉の抑制性について鋭意検討した結果、紙基材の容器として外面となる側に軽質炭酸カルシウムと水溶性バインダーを含有する顔料塗工層を有し、紙基材の容器として内面となる側にポリエチレンイミンを有することにより、上記問題点を解決するに至った。即ち、本発明は、下記の容器用原紙に係る。 As a result of intensive studies on the printability of the base paper for containers, the formability of the thermoplastic resin layer, adhesion, and cracking during production and processing, and the suppression of paper dust, the present inventors have found that the outer surface of the paper substrate is a container. By having a pigment coating layer containing light calcium carbonate and a water-soluble binder on the side to become, and having polyethyleneimine on the side to become the inner surface as a container for the paper base material, the above problems have been solved. That is, the present invention relates to the following container base paper.
項１：紙基材を含む容器用原紙であって、前記紙基材の容器として外面となる側に顔料と水溶性バインダーを含有する顔料塗工層を有し、前記顔料が軽質炭酸カルシウムを含み、前記紙基材の容器として内面となる側にポリエチレンイミンを有することを特徴とする容器用原紙。 Item 1: A base paper for a container containing a paper base material, having a pigment coating layer containing a pigment and a water-soluble binder on the outer surface side as a container of the paper base material, wherein the pigment comprises light calcium carbonate A container base paper comprising polyethylene imine on the inner surface side as a container of the paper base material.
項２：前記顔料塗工層が顔料１００質量部に対して水溶性バインダーを２〜１２質量部含有する、項１に記載の容器用原紙。 Item 2: The container base paper according to Item 1, wherein the pigment coating layer contains 2 to 12 parts by mass of a water-soluble binder with respect to 100 parts by mass of the pigment.
項３：前記顔料塗工層が更にカオリンを含み、カオリン及び軽質炭酸カルシウムの質量比率が３５：６５〜６０：４０である、項１または２に記載の容器用原紙。 Item 3: The container base paper according to Item 1 or 2, wherein the pigment coating layer further contains kaolin, and the mass ratio of kaolin and light calcium carbonate is 35:65 to 60:40.
項４：前記水溶性バインダーが澱粉及びその誘導体、並びにカゼインから選ばれる少なくとも１種である、項１〜３のいずれか１項に記載の容器用原紙。 Item 4: The container base paper according to any one of Items 1 to 3, wherein the water-soluble binder is at least one selected from starch, derivatives thereof, and casein.
項５：前記紙基材が古紙パルプを含まない、項１〜４のいずれか１項に記載の容器用原紙。 Item 5: The container base paper according to any one of Items 1 to 4, wherein the paper base material does not contain waste paper pulp.
項６：前記紙基材が３層以上の紙層を有し、表層と裏層の間に形成された中層がカナディアンスタンダードフリーネス（ＪＩＳ Ｐ ８１２１に基づく）３５０〜４００ｍｌのパルプを含有する、項１〜５のいずれか１項に記載の容器用原紙。 Item 6: The paper base material has three or more paper layers, and an intermediate layer formed between the front layer and the back layer contains 350 to 400 ml of Canadian standard freeness (based on JIS P 8121). Container base paper of any one of 1-5.
項７：前記項１〜６のいずれか１項に記載の容器用原紙の製造方法において、前記紙基材の容器として外面となる側に前記顔料塗工層を形成する工程、前記紙基材の容器として内面となる側にポリエチレンイミンをカレンダー塗工により付与する工程を含む、容器用原紙の製造方法。 Item 7: In the method for producing a container base paper according to any one of Items 1 to 6, the step of forming the pigment coating layer on the outer surface of the paper base material as a container, the paper base material The manufacturing method of the base paper for containers including the process of providing a polyethyleneimine by the calendar coating to the side used as the inner surface of this.
本発明の容器用原紙は、塗工層強度が高く、印刷適性、熱可塑性樹脂層の形成性、密着性、及び製造、加工時における割れ、紙粉の抑制性に優れる。 The container base paper of the present invention has high coating layer strength, and is excellent in printability, thermoplastic resin layer formability, adhesion, and cracking and paper powder suppression during production and processing.
一般に紙基材を含む容器用原紙は、通常の印刷用塗工紙に比べて剛度が高く、化粧箱等に加工される白板紙に比べてヒートシール等により容器として成形した際の折り曲げ割れ、紙粉が品質上の問題となる。更に、容器用原紙を構成する紙基材に塗工層を設けた場合、折り曲げ加工等による割れ、紙粉の問題が深刻化することや、平滑化処理等の過酷な条件で塗工層が脱落する問題があり、特に顔料塗工層を設けることは容易でない。本発明では、容器用原紙を構成する紙基材の容器として外面となる側に軽質炭酸カルシウムと水溶性バインダーを含有する顔料塗工層を有することにより、印刷適性に優れ、且つ塗工層の強度を高めて、容器として成形する際の折り曲げ加工等や、カレンダー等の平滑化処理において塗工層が脱落する恐れがない。このため、従来、顔料塗工層を有する紙基材にポリエチレンイミン等をカレンダー塗工等により塗布または含浸させる場合、圧力と摩擦により脱落した塗工層の成分が塗料粕となって混入し、容器として成形した際に型が入る等の問題があったが、本発明では、塗布または含浸する手段によらず、このような問題を生じない容器用原紙を得ることができる。 In general, a container base paper containing a paper base has higher rigidity than ordinary coated paper for printing, and is bent and cracked when formed as a container by heat sealing or the like compared to white paperboard processed into a decorative box, etc. Paper dust becomes a quality problem. Furthermore, when the coating layer is provided on the paper base material constituting the container base paper, the problem of cracking due to bending or the like, the problem of paper dust becomes serious, or the coating layer is formed under severe conditions such as smoothing treatment. There is a problem of dropping off, and it is not easy to provide a pigment coating layer. In the present invention, by having a pigment coating layer containing light calcium carbonate and a water-soluble binder on the outer surface side as a container of a paper base material constituting the base paper for containers, the printability is excellent and the coating layer There is no fear that the coating layer will fall off in the bending process or the like when forming as a container with a high strength or a smoothing process such as a calendar. For this reason, conventionally, when applying or impregnating polyethyleneimine or the like to a paper base material having a pigment coating layer by calendar coating or the like, the components of the coating layer that have fallen off due to pressure and friction are mixed in as a paint cake, Although there was a problem that a mold enters when molded as a container, in the present invention, a base paper for a container that does not cause such a problem can be obtained regardless of means for applying or impregnating.
本発明における紙基材は、単層の紙層からなっていてもよく、複数の紙層からなっていてもよい。本発明では、少なくとも容器として成形した際に容器の外面となる側の表層、内面となる側の裏層、及び表層と裏層の間に形成された中層からなる多層構造を有していることが好ましい。多層に抄き合わせることにより、中層に比較的叩解度の高いパルプを用いて層間強度を向上し、層間剥離を防ぐことができる。紙層の数は、３層以上の紙層を有することが好ましいが、上限は特に限定されず、６層程度とすればよく、特に好ましい層数は５層または６層である。 The paper base material in the present invention may consist of a single paper layer or a plurality of paper layers. In the present invention, at least when formed as a container, it has a multilayer structure comprising a surface layer on the outer surface side of the container, a back layer on the inner surface side, and an intermediate layer formed between the surface layer and the back layer. Is preferred. By making it into multiple layers, it is possible to improve the interlaminar strength by using a pulp having a relatively high beating degree for the middle layer and prevent delamination. The number of paper layers is preferably 3 or more. However, the upper limit is not particularly limited, and may be about 6 layers. The particularly preferred number of layers is 5 or 6.
本発明における容器用原紙の坪量は、１００〜５００ｇ／ｍ２程度が好ましく、１４０〜４７０ｇ／ｍ２程度がより好ましい。１００ｇ／ｍ２以上とすることにより、剛度を高めて、容器形成後に内容物を充填する際に問題となる胴膨れを抑制できる。５００ｇ／ｍ２以下とすることにより、容器としての成形性を向上できる。 The basis weight of the container base paper in the present invention is preferably about 100 to 500 g / m 2, about 140~470g / m 2 is more preferable. By setting it as 100 g / m < 2 > or more, rigidity can be improved and the swelling which becomes a problem when filling the contents after container formation can be suppressed. The moldability as a container can be improved by setting it as 500 g / m < 2 > or less.
容器として成形した際に外面となる側には通常、印刷が施される。また、印刷は、内容物に対する耐水性や耐酸性を付与するために外面または内面に設けられる熱可塑性樹脂層に施してもよく、熱可塑性樹脂層にも紙表面の凹凸パターンが反映される。このため、紙表面はできる限り高平滑であることが好ましい。本発明では、容器用原紙の顔料塗工層表面のＪＩＳ Ｐ ８１５１に基づくパーカープリントサーフ平滑度を２μｍ以下とすることが好ましく、１．５μｍ以下とすることがより好ましい。２μｍ以下とすることにより、グラビア印刷適性を高めることができる。 Printing is usually performed on the side that becomes the outer surface when formed as a container. Further, printing may be performed on a thermoplastic resin layer provided on the outer surface or the inner surface in order to impart water resistance or acid resistance to the contents, and the uneven pattern on the paper surface is also reflected in the thermoplastic resin layer. For this reason, the paper surface is preferably as smooth as possible. In the present invention, the Parker print surf smoothness based on JIS P 8151 on the surface of the pigment coating layer of the base paper for containers is preferably 2 μm or less, and more preferably 1.5 μm or less. Gravure printing aptitude can be improved by setting it as 2 micrometers or less.
本発明における紙基材の紙層を形成する原料パルプとしては、本発明の効果を阻害しない範囲で各種のものが使用でき、化学パルプ（針葉樹、広葉樹）や機械パルプ、古紙パルプ、非木材パルプ、合成パルプ等が挙げられる。これらパルプは単独で用いてもよいし、２種以上混合して用いてもよい。 As the raw material pulp for forming the paper layer of the paper base material in the present invention, various pulps can be used as long as the effects of the present invention are not impaired. Chemical pulp (conifer, hardwood), mechanical pulp, waste paper pulp, non-wood pulp And synthetic pulp. These pulps may be used alone or in combination of two or more.
本発明における容器用原紙は、用途を特に限定するものではないが、紙層中に古紙パルプを含まないことにより、ホットドリンク、コールドドリンク、アイスクリーム、ヨーグルト等の食品用途向けに好適に用いることができる。 The container base paper in the present invention is not particularly limited in use, but it is preferably used for food applications such as hot drinks, cold drinks, ice creams, yogurts by not including waste paper pulp in the paper layer. Can do.
中層のパルプ配合割合としては、中層のパルプ全固形量のうち針葉樹晒クラフトパルプ（以下、ＮＢＫＰともいう）が５〜３０％であることが好ましい。５％以上とすることにより、層間強度を向上して層間剥離を防ぐことができる。一方、３０％以下とすることにより、紙が締まって密度が高くなり容器としての成形性が悪化するといった問題がない。 As the blending ratio of the middle layer pulp, it is preferable that the softwood bleached kraft pulp (hereinafter also referred to as NBKP) is 5 to 30% of the total solid amount of the middle layer pulp. By setting it to 5% or more, interlayer strength can be improved and delamination can be prevented. On the other hand, by setting it to 30% or less, there is no problem that the paper is tightened and the density is increased and the moldability as a container is deteriorated.
表裏層のパルプ配合割合としては、表裏各層におけるパルプの全固形量のうち広葉樹晒クラフトパルプ（以下、ＬＢＫＰともいう）が６０％以上であることが好ましい。これにより、表裏層の平滑性を高めるとともにクッション性を高めて、優れたグラビア印刷適性を得ることができる。 As the pulp blending ratio of the front and back layers, it is preferable that hardwood bleached kraft pulp (hereinafter also referred to as LBKP) is 60% or more of the total solid content of the pulp in the front and back layers. Thereby, the smoothness of the front and back layers can be improved and the cushioning properties can be improved, and excellent gravure printing aptitude can be obtained.
本発明において用いられる原料パルプの混合濾水度は、ＪＩＳ Ｐ ８１２１に基づくカナディアンスタンダードフリーネスが３５０〜５００ｍｌの範囲となるものを用いることが好ましい。フリーネスを３５０ｍｌ以上とすることにより、ライン速度を大幅に低下させることなく、抄紙工程での水持ちに由来するトラブルを回避することができる。一方、５００ｍｌ以下とすることにより、紙表面の凹凸を減らして印刷適性を向上でき、紙力を高めることができる。また、抄紙工程でのトラブルを回避するために、表裏層のフリーネスは中層のフリーネスより高く設定することが好ましい。本発明における中層のフリーネスは、３５０ｍｌ以上４００ｍｌ以下であることが好ましく、より好ましくは３６０ｍｌ以上３９０ｍｌ以下である。３５０ｍｌ以上とすることにより、ライン速度を大幅に低下させることなく、抄紙工程での水持ちに由来するトラブルを回避することができる。一方、４００ｍｌ以下とすることにより、層間強度を向上して層間剥離を防ぐことができる。 The mixed freeness of the raw pulp used in the present invention is preferably such that the Canadian standard freeness based on JIS P 8121 is in the range of 350 to 500 ml. By setting the freeness to 350 ml or more, it is possible to avoid troubles due to water retention in the paper making process without significantly reducing the line speed. On the other hand, by setting it to 500 ml or less, unevenness on the paper surface can be reduced, printability can be improved, and paper strength can be increased. In order to avoid troubles in the paper making process, the freeness of the front and back layers is preferably set higher than the freeness of the middle layer. The freeness of the middle layer in the present invention is preferably 350 ml or more and 400 ml or less, more preferably 360 ml or more and 390 ml or less. By setting it as 350 ml or more, the trouble derived from the water retention in a papermaking process can be avoided, without reducing a line speed significantly. On the other hand, by setting it to 400 ml or less, interlayer strength can be improved and delamination can be prevented.
本発明では表裏層または中層へ柔軟剤を含有させてもよい。柔軟剤を含有させることで繊維間結合を阻害、繊維自体を柔軟にすることができる。よって、積層シートに入れられた罫線に沿って折り曲げ易くなるという作用が働き、多種多様な罫線形状に対応させることが可能となり、容器としての成形性を飛躍的に向上させることができる。 In the present invention, a softener may be contained in the front and back layers or the middle layer. By containing a softening agent, interfiber bonding can be inhibited and the fiber itself can be softened. Therefore, the effect | action that it becomes easy to bend along the ruled line put into the lamination sheet | seat acts, It becomes possible to respond | correspond to various ruled line shapes, and the moldability as a container can be improved greatly.
柔軟性を向上させるためには、容器用原紙の全層に柔軟剤を含有させるのがより効果的であるが、表裏層に含有させると表面強度が大きく低下して、容器用原紙の表裏面に設ける熱可塑性樹脂層との接着不良を招いてしまうため好ましくない。よって、中層以外には柔軟剤を含有させないことが好ましい。 In order to improve flexibility, it is more effective to contain a softener in all layers of the container base paper. However, if it is contained in the front and back layers, the surface strength is greatly reduced, and the front and back surfaces of the container base paper Inadequate adhesion with the thermoplastic resin layer provided on the surface is undesirable. Therefore, it is preferable not to contain a softening agent other than the middle layer.
本発明に使用できる柔軟剤としては、パルプ繊維表面に弱い疎水化を施し、繊維間結合を阻害できるものであれば特に限定されない。例えば、油脂系非イオン界面活性剤、糖アルコール系非イオン系界面活性剤、多価アルコール型非イオン界面活性剤、高級アルコール、多価アルコールと脂肪酸のエステル化合物、高級アルコールあるいは高級脂肪酸のポリオキシアルキレン付加物、多価アルコールと脂肪酸のエステル化合物のポリオキシアルキレン付加物、高級脂肪酸エステルのポリオキシアルキレン付加物、脂肪酸ポリアミドアミン、ポリアルキレンポリアミン脂肪酸エピクロルヒドリン重縮合物等が挙げられる。 The softening agent that can be used in the present invention is not particularly limited as long as it weakly hydrophobizes the pulp fiber surface and can inhibit interfiber bonding. For example, oil-based nonionic surfactants, sugar alcohol-based nonionic surfactants, polyhydric alcohol-type nonionic surfactants, higher alcohols, ester compounds of polyhydric alcohols and fatty acids, higher alcohols or polyoxygens of higher fatty acids Examples include alkylene adducts, polyoxyalkylene adducts of ester compounds of polyhydric alcohols and fatty acids, polyoxyalkylene adducts of higher fatty acid esters, fatty acid polyamidoamines, polyalkylene polyamine fatty acid epichlorohydrin polycondensates and the like.
本発明では原料パルプとともに、必要に応じて種々の内添薬品を使用できる。例えば、フッ素系樹脂、ポリアミド系樹脂、ワックスエマルション等の撥水剤、ロジン系サイズ剤、スチレン・マレイン酸、アルキルケテンダイマー、アルケニル無水コハク酸等、天然および合成の製紙用内添サイズ剤、各種紙力増強剤、湿潤紙力剤、澱粉、濾水歩留向上剤、耐水化剤、消泡剤、タルク等の填料、各種染料等を適宜使用することができる。ただし、本発明では、ホットドリンク、コールドドリンク、アイスクリーム、ヨーグルト等の食品用途向けには、紙層中に蛍光染料を含まないことが好ましい。 In the present invention, various internal chemicals can be used together with the raw material pulp as required. For example, water-repellent agents such as fluorine resins, polyamide resins, wax emulsions, rosin sizing agents, styrene / maleic acid, alkyl ketene dimers, alkenyl succinic anhydrides, natural and synthetic paper additive sizing agents, various types Paper strength enhancers, wet paper strength agents, starch, drainage yield improvers, water resistance agents, antifoaming agents, fillers such as talc, various dyes, and the like can be used as appropriate. However, in the present invention, it is preferable that the paper layer does not contain a fluorescent dye for food applications such as hot drinks, cold drinks, ice creams and yogurts.
本発明における抄紙時のｐＨは、酸性抄紙である４．０付近から６〜８程度の中性抄紙領域で必要に応じて任意に選択することが可能である。 The pH at the time of papermaking in the present invention can be arbitrarily selected as necessary in the neutral papermaking region from about 4.0 which is acidic papermaking to about 6-8.
本発明の容器用原紙を製造するための抄紙機については、特に限定されないが、３層以上の抄き合わせが可能なマシンが好ましい。例えば、長網抄紙機、短網抄紙機、円網抄紙機等での抄き合わせによって抄紙され、容器用原紙が製造される。 The paper machine for producing the container base paper of the present invention is not particularly limited, but a machine capable of making three or more layers is preferable. For example, paper is made by combining with a long net paper machine, a short net paper machine, a circular net paper machine, etc. to produce a base paper for containers.
なお本発明においては、特に制限はないが、各種の仕上げ装置、例えば塗工層を形成する塗工工程の前または後、あるいはその両方においてマシンカレンダー、および／またはスーパーカレンダー、グロスカレンダー、ソフトニップカレンダー等のカレンダーに通紙して平滑化処理することにより、グラビア印刷適性に優れた製品仕上げを施すことができる。 In the present invention, although there is no particular limitation, a machine calendar and / or a super calendar, a gloss calendar, a soft nip before and / or after various coating apparatuses such as a coating process for forming a coating layer. By passing the paper through a calendar such as a calendar and performing a smoothing treatment, a product finish excellent in gravure printing suitability can be applied.
本発明では、紙基材の容器として外面となる側（紙基材の表面側）に、顔料として軽質炭酸カルシウムと水溶性バインダーを含有する顔料塗工層を備えている。これにより、顔料塗工層の強度を高めて、カレンダー等の平滑化処理で塗工層が脱落する恐れがなく、グラビア印刷適性、及び製造、加工時における割れ、紙粉の抑制性に優れた容器用原紙を得ることができる。更に本発明では、紙基材の容器として内面となる側（紙基材の裏面側）にポリエチレンイミンを有するため、そのポリエチレンイミンを付与するための裏面処理に対して、紙基材の反対面である表面側が十分耐え得る強度を有する顔料塗工層を備えたものである。 In the present invention, a pigment coating layer containing light calcium carbonate and a water-soluble binder as pigments is provided on the outer surface (paper substrate surface side) as a paper substrate container. As a result, the strength of the pigment coating layer is increased, and there is no fear that the coating layer will fall off due to a smoothing treatment such as a calendar, and it is excellent in gravure printing suitability and crack and paper powder suppression during manufacturing and processing. Container base paper can be obtained. Furthermore, in this invention, since it has a polyethyleneimine in the side used as the inner surface (back side of a paper base material) as a container of a paper base material, with respect to the back surface treatment for providing the polyethyleneimine, And a pigment coating layer having a strength that the surface side can sufficiently withstand.
顔料塗工層は、軽質炭酸カルシウムと水溶性バインダーを含有する塗料を塗布及び乾燥することにより形成することができる。例えば、紙基材の紙層が３層からなる場合、容器として外面となる表層上に塗料を塗布すればよい。本発明では、顔料塗工層が紙基材に近い側から第１塗工層及び第１塗工層上に形成された第２塗工層からなる多層構造を有していることが好ましい。顔料塗工層を多層構造とすることにより、塗工量を所望の範囲に容易に調節することができ、容器としての意匠性を著しく損なう塗工欠陥（未塗工部）の無い塗工面を得ることができる。別言すると、１種の塗料を用いて２以上の塗工層を形成してもよく、また２種以上の塗料を層ごとに使い分けて２以上の塗工層を形成してもよい。本発明における顔料塗工層は、塗工適性にも優れることから、各層を形成する塗料の組成は同一であることが好ましい。 The pigment coating layer can be formed by applying and drying a paint containing light calcium carbonate and a water-soluble binder. For example, when the paper layer of the paper base is composed of three layers, the paint may be applied on the outer surface layer as a container. In the present invention, it is preferable that the pigment coating layer has a multilayer structure including a first coating layer and a second coating layer formed on the first coating layer from the side close to the paper substrate. By making the pigment coating layer into a multilayer structure, it is possible to easily adjust the coating amount within a desired range, and to provide a coating surface free from coating defects (uncoated parts) that significantly impairs the design of the container. Can be obtained. In other words, two or more coating layers may be formed by using one kind of paint, or two or more coating layers may be formed by using two or more kinds of paints for each layer. Since the pigment coating layer in this invention is excellent also in coating suitability, it is preferable that the composition of the coating material which forms each layer is the same.
顔料塗工層を形成する塗料は、液温２５℃、６０ｒｐｍにおけるＢ型粘度が１００〜５００ｍＰａ・ｓ、且つ８８００ｒｐｍにおけるハイシェア粘度が５〜１５ｍＰａ・ｓの範囲であることが好ましい。 The paint forming the pigment coating layer preferably has a B-type viscosity of 100 to 500 mPa · s at a liquid temperature of 25 ° C. and 60 rpm, and a high shear viscosity of 8 to 15 mPa · s at 8800 rpm.
塗料の粘度を上記の範囲に調節する方法としては、塗料の固形分濃度を適宜調整するほかに、顔料塗工液の構成成分として、各種顔料の配合比率、バインダーの種類、顔料とバインダーの配合比率、増粘保水剤等の各種助剤の配合等により粘度を調節することができる。塗料の固形分濃度としては、塗料の粘度が上記の範囲に入る固形分濃度であれば特に限定されるものではないが、塗工後の乾燥工程における乾燥負荷の低減や、塗工速度増速による容器用原紙の生産効率向上の観点から、固形分濃度として４５〜５５重量％とすることが好ましい。 As a method of adjusting the viscosity of the paint to the above range, in addition to adjusting the solid content concentration of the paint as appropriate, as a constituent of the pigment coating liquid, the blending ratio of various pigments, the type of binder, the blending of pigment and binder Viscosity can be adjusted by blending various auxiliary agents such as ratio and thickening water retention agent. The solid content concentration of the paint is not particularly limited as long as the viscosity of the paint falls within the above range, but the drying load is reduced in the drying process after coating, and the coating speed is increased. From the viewpoint of improving the production efficiency of the base paper for containers, the solid content concentration is preferably 45 to 55% by weight.
顔料塗工層中の全顔料の固形量に占める軽質炭酸カルシウムの含有割合は、３５〜７０質量％が好ましく、４０〜６５質量％以下がより好ましく、４５〜６０質量％以下が更に好ましい。３５質量％以上とすることにより、食品用途としての使用が望ましくない蛍光染料を使用することなく白色度を高めることができ、印刷物の発色性を向上できる。一方、７０質量％以下とすることにより、塗工層を形成する顔料の過度な微細化による塗工層強度不足を防ぎ、カレンダー等による平滑化処理において顔料塗工層の成分が脱落することなく、容器として成形した際に折り曲げ割れや粉落ちを生じる恐れがない。 The content ratio of light calcium carbonate in the solid amount of all pigments in the pigment coating layer is preferably 35 to 70% by mass, more preferably 40 to 65% by mass, and still more preferably 45 to 60% by mass. By setting the content to 35% by mass or more, the whiteness can be increased without using a fluorescent dye which is undesirable for food use, and the color developability of the printed matter can be improved. On the other hand, by setting it to 70% by mass or less, insufficient coating layer strength due to excessive refinement of the pigment forming the coating layer is prevented, and the components of the pigment coating layer do not fall off in the smoothing treatment by a calendar or the like. When molded as a container, there is no risk of bending cracks or powder falling.
本発明における顔料塗工層中には、顔料としてカオリンを軽質炭酸カルシウムと併用して含有させることが好ましい。カオリン及び軽質炭酸カルシウムの質量比率は、３５：６５〜６０：４０が好ましく、４０：６０〜５５：４５の範囲がより好ましい。カオリンの比率を３５質量％以上とすることにより、高平滑な塗工面が得られ、グラビア印刷適性に優れ、光沢度を高めることができる。一方、６０質量％以下とすることにより、白色度を高めることができる。 In the pigment coating layer in the present invention, kaolin is preferably used as a pigment in combination with light calcium carbonate. The mass ratio of kaolin and light calcium carbonate is preferably 35:65 to 60:40, more preferably 40:60 to 55:45. By setting the kaolin ratio to 35% by mass or more, a highly smooth coated surface is obtained, the gravure printing suitability is excellent, and the glossiness can be increased. On the other hand, whiteness can be raised by setting it as 60 mass% or less.
顔料としては、本発明の効果を損なわない範囲で他の顔料を含有することもできる。他の顔料としては、例えば焼成カオリン、タルク、水酸化アルミニウム、二酸化チタン、硫酸バリウム、酸化亜鉛、サチンホワイト、重質炭酸カルシウム、硫酸カルシウム等の無機顔料、プラスチック中空粒子等の有機顔料が挙げられる。 As a pigment, another pigment can also be contained in the range which does not impair the effect of this invention. Examples of the other pigments include inorganic pigments such as calcined kaolin, talc, aluminum hydroxide, titanium dioxide, barium sulfate, zinc oxide, satin white, heavy calcium carbonate, and calcium sulfate, and organic pigments such as plastic hollow particles. .
本発明では、顔料塗工層中の水溶性バインダーの含有量としては、軽質炭酸カルシウムを含む顔料１００質量部に対して２〜１２質量部が好ましく、３〜１０質量部がより好ましく、４〜９質量部が更に好ましく、４〜６質量部が特に好ましい。２質量部以上とすることにより、塗料の保水性を高めて浸み込みムラのない均一な塗工層を形成することができ、グラビア印刷適性を向上できる。また、顔料塗工層の強度を高めて、カレンダー等の平滑化処理や、容器として成形する際の折り曲げ加工等で塗工層が脱落する恐れがない。一方、１２質量部以下とすることにより、グラビア網点欠落率を大幅に減らして、グラビア印刷適性を向上できる。また、光沢度を上げる効果をも得られる。 In this invention, as content of the water-soluble binder in a pigment coating layer, 2-12 mass parts is preferable with respect to 100 mass parts of pigments containing light calcium carbonate, 3-10 mass parts is more preferable, 4- 9 mass parts is still more preferable, and 4-6 mass parts is especially preferable. By setting it as 2 mass parts or more, the water retention of a coating material can be improved, the uniform coating layer without a soaking | uniform-in unevenness can be formed, and gravure printing aptitude can be improved. Further, the strength of the pigment coating layer is increased, and there is no possibility that the coating layer falls off due to a smoothing process such as a calendar or a bending process when forming as a container. On the other hand, by setting it to 12 parts by mass or less, the gravure halftone dot missing rate can be greatly reduced and the gravure printing aptitude can be improved. In addition, an effect of increasing the glossiness can be obtained.
本発明における水溶性バインダーとしては、各種公知のものを使用することができる。水溶性バインダーの具体例としては、例えば、澱粉及びその誘導体、部分鹸化ポリビニルアルコール、完全鹸化ポリビニルアルコール、変性ポリビニルアルコール、メトキシセルロース、カルボキシメチルセルロース、ヒドロキシプロピルメチルセルロース、メチルセルロース及びエチルセルロース等のセルロース誘導体、ポリアクリル酸ソーダ、ポリビニルピロリドン、アクリル酸アミド−アクリル酸エステル共重合体、アクリル酸アミド−アクリル酸エステル−メタクリル酸共重合体、スチレン−無水マレイン酸共重合体アルカリ塩、ポリアクリルアミド、アルギン酸ソーダ、ゼラチン、カゼイン等が挙げられる。これらの中でも、塗工層の強度を向上する観点から、澱粉及びその誘導体、並びにカゼインから選ばれる少なくとも１種が好ましく、澱粉及びその誘導体がより好ましい。これら澱粉類の具体例としては、例えば酸化澱粉、陽性澱粉、エステル化澱粉、デキストリン等が挙げられる。これら澱粉類の中でも、酸化澱粉が好ましい。 Various known binders can be used as the water-soluble binder in the present invention. Specific examples of the water-soluble binder include starch and derivatives thereof, partially saponified polyvinyl alcohol, fully saponified polyvinyl alcohol, modified polyvinyl alcohol, cellulose derivatives such as methoxycellulose, carboxymethylcellulose, hydroxypropylmethylcellulose, methylcellulose and ethylcellulose, and polyacrylic. Acid soda, polyvinylpyrrolidone, acrylic acid amide-acrylic acid ester copolymer, acrylic acid amide-acrylic acid ester-methacrylic acid copolymer, styrene-maleic anhydride copolymer alkali salt, polyacrylamide, sodium alginate, gelatin, Casein etc. are mentioned. Among these, from the viewpoint of improving the strength of the coating layer, at least one selected from starch and derivatives thereof and casein is preferable, and starch and derivatives thereof are more preferable. Specific examples of these starches include oxidized starch, positive starch, esterified starch, and dextrin. Among these starches, oxidized starch is preferable.
本発明では、顔料塗工層中にラテックスから得られる共重合体を水溶性バインダーと併用して含有させることが好ましい。ラテックスから得られる共重合体の含有量は、軽質炭酸カルシウムを含む全顔料１００質量部に対して１０〜２５質量部が好ましく、１５〜２０質量部がより好ましい。１０質量部以上とすることにより、塗工層の強度をより一層向上することができる。一方、２５質量部を超えて含有させると塗工層の強度は飽和してしまうため、２５質量部以下とすることにより、製造コストを抑えることができる。 In the present invention, it is preferable that a copolymer obtained from latex is contained in the pigment coating layer in combination with a water-soluble binder. The content of the copolymer obtained from the latex is preferably 10 to 25 parts by mass and more preferably 15 to 20 parts by mass with respect to 100 parts by mass of the total pigment containing light calcium carbonate. By setting it as 10 mass parts or more, the intensity | strength of a coating layer can be improved further. On the other hand, since the intensity | strength of a coating layer will be saturated if it contains exceeding 25 mass parts, manufacturing cost can be suppressed by setting it as 25 mass parts or less.
顔料塗工層中の水溶性バインダー及びラテックスから得られる共重合体の質量比率は、５：９５〜３０：７０の範囲が好ましい。水溶性バインダーの質量比率を５以上とすることにより、塗料の保水性を高めて均一な塗工層を形成することができる。一方、３０以下とすることにより、グラビア網点欠落率を大幅に減らして、グラビア印刷適性を向上できる。 The mass ratio of the copolymer obtained from the water-soluble binder and latex in the pigment coating layer is preferably in the range of 5:95 to 30:70. By setting the mass ratio of the water-soluble binder to 5 or more, it is possible to increase the water retention of the paint and form a uniform coating layer. On the other hand, by setting it to 30 or less, the gravure halftone dot loss rate can be greatly reduced, and the gravure printing suitability can be improved.
ラテックスの具体例としては、例えば、スチレン−ブタジエン共重合体ラテックス、メチルメタクリレート−ブタジエン共重合体ラテックス、スチレン−メチルメタクリレート−ブタジエン共重合体ラテックス等の共役ジエン系共重合体ラテックス、アクリル酸エステルおよび／またはメタクリル酸エステルの重合体または共重合体ラテックス等のアクリル系重合体ラテックス、エチレン−酢酸ビニル重合体ラテックス等のビニル系重合体ラテックス、あるいはこれらの各種重合体ラテックスをカルボキシル基等の官能基含有単量体で変性した重合体または共重合体ラテックス等の水分散性バインダーが挙げられる。 Specific examples of the latex include conjugated diene copolymer latex such as styrene-butadiene copolymer latex, methyl methacrylate-butadiene copolymer latex, styrene-methyl methacrylate-butadiene copolymer latex, acrylic acid ester and // Acrylic polymer latex such as polymer or copolymer latex of methacrylic acid ester, vinyl polymer latex such as ethylene-vinyl acetate polymer latex, or these various polymer latexes with functional groups such as carboxyl groups Examples thereof include water-dispersible binders such as a polymer or copolymer latex modified with a containing monomer.
また、ラテックスとしては、顔料塗工層の強度をより一層向上する観点から、ゲル分率が７０％以上、ガラス転移温度（以下、Ｔｇともいう）が−３５℃以上１０℃以下のスチレン−ブタジエン共重合体を含有する共重合体ラテックスからなることが好ましい。 The latex is a styrene-butadiene having a gel fraction of 70% or more and a glass transition temperature (hereinafter also referred to as Tg) of −35 ° C. or more and 10 ° C. or less from the viewpoint of further improving the strength of the pigment coating layer. It preferably consists of a copolymer latex containing a copolymer.
本発明における塗工層を形成する方法については特に限定されず、例えばメイヤーバーコーティング、プレーンバーコーティング、エアナイフコーティング、バリバーブレードコーティング、ピュアブレードコーティング、ロッドブレードコーティング、ショートドウェルコーティング、カーテンコーティング、ダイコーティング等の適当な塗工方式を採用することができる。 The method for forming the coating layer in the present invention is not particularly limited. For example, Mayer bar coating, plain bar coating, air knife coating, varibar blade coating, pure blade coating, rod blade coating, short dwell coating, curtain coating, die An appropriate coating method such as coating can be employed.
本発明では、塗料中の顔料によるメイヤーバーやブレードの摩耗が塗工量の変動に影響することから、塗工方式としてはプレーンバーコーティングが好ましい。 In the present invention, plain bar coating is preferred as the coating method because wear of the Mayer bar or blade due to the pigment in the paint affects the variation in the coating amount.
顔料塗工層が紙基材に近い側から第１塗工層及び第１塗工層上に形成された第２塗工層からなる多層構造を有している場合、第１塗工層を塗布及び乾燥して形成した後、第１塗工層上に第２塗工層用塗料を塗布及び乾燥して第２塗工層を形成してもよいし、第１塗工層用塗料と第２塗工層用塗料を塗布、積層した後、乾燥させて第１塗工層及び第２塗工層を形成してもよい。本発明では、塗工欠陥（未塗工部）の無い塗工面を得る観点から、第１塗工層用塗料を塗布した後、乾燥させることなく第１塗工層用塗料が湿潤状態のうちに第１塗工層塗布面上に第２塗工層用塗料を塗布し、その後、乾燥させて第１塗工層と第２塗工層を形成することが好ましい。 When the pigment coating layer has a multilayer structure composed of the first coating layer and the second coating layer formed on the first coating layer from the side close to the paper substrate, the first coating layer is After forming by coating and drying, the second coating layer coating may be applied and dried on the first coating layer to form the second coating layer, or the first coating layer coating and After coating and laminating the coating material for the second coating layer, it may be dried to form the first coating layer and the second coating layer. In the present invention, from the viewpoint of obtaining a coated surface having no coating defects (uncoated portions), after the first coating layer coating is applied, the first coating layer coating is in a wet state without drying. It is preferable to apply the coating material for the second coating layer on the surface to which the first coating layer is applied, and then dry to form the first coating layer and the second coating layer.
各塗料の合計の塗工量は、乾燥重量で６〜１５ｇ／ｍ２程度が好ましく、８〜１２ｇ／ｍ２程度がより好ましい。６ｇ／ｍ２以上とすることにより、グラビア印刷適性を向上できる。一方、１５ｇ／ｍ２以下とすることにより、容器として成形した際に塗工層が折り曲げ割れを起こす恐れがない。 The total coating amount of each paint is preferably about 6 to 15 g / m 2 by dry weight, and more preferably about 8 to 12 g / m 2 . Gravure printing aptitude can be improved by setting it as 6 g / m < 2 > or more. On the other hand, by setting it as 15 g / m 2 or less, there is no possibility that the coating layer is bent and cracked when formed as a container.
容器用原紙は、内容物に対する耐水性や耐酸性を付与する目的から通常、少なくとも容器の内面となる側には熱可塑性樹脂層が設けられる。熱可塑性樹脂層は、ラミネートやコーティング等の公知の手段を用いて設けることができる。熱可塑性樹脂としては、例えば、低密度ポリエチレン、中密度ポリエチレン、高密度ポリエチレン等のポリエチレン、ポリプロピレン等のポリオレフィン系樹脂が挙げられる。更に、容器用原紙と熱可塑性樹脂層の間には、ポリエチレンテレフタレート、ポリブチレンテレフタレート等の飽和ポリエステル系樹脂、エチレンビニルアルコール共重合体等からなるフィルムを中間層として設けてもよい。また、このフィルムの少なくとも片面には、ガスバリア性の機能を担持させるため酸化珪素、酸化アルミニウム、酸化マグネシウム等からなる無機化合物が蒸着されていてもよい。 The container base paper is usually provided with a thermoplastic resin layer on at least the inner surface of the container for the purpose of imparting water resistance and acid resistance to the contents. The thermoplastic resin layer can be provided using a known means such as lamination or coating. Examples of the thermoplastic resin include polyethylenes such as low density polyethylene, medium density polyethylene, and high density polyethylene, and polyolefin resins such as polypropylene. Furthermore, a film made of a saturated polyester resin such as polyethylene terephthalate or polybutylene terephthalate, an ethylene vinyl alcohol copolymer or the like may be provided as an intermediate layer between the container base paper and the thermoplastic resin layer. In addition, an inorganic compound made of silicon oxide, aluminum oxide, magnesium oxide, or the like may be deposited on at least one surface of the film in order to support a gas barrier function.
本発明では、紙基材の少なくとも容器として内面となる側にポリエチレンイミンを有している。これにより、熱可塑性樹脂層の優れた形成性、密着性を得ることができる。紙基材の容器として内面となる側にポリエチレンイミンを付与するためには、例えばポリエチレンイミンの水溶液を紙基材の裏面に塗布または含浸する等の裏面処理を施すことが好ましい。水溶液の濡れ性、熱可塑性樹脂の種類に応じて、ポリビニルアルコール、澱粉、ポリアクリルアミド、アクリル系樹脂、スチレン−ブタジエン系樹脂、スチレン−イソプレン系樹脂、ポリエステル系樹脂、エチレン−酢酸ビニル系樹脂、酢酸ビニル−ビニルアルコール系樹脂、ウレタン系樹脂、フッ素系樹脂などを併用することもできる。 In the present invention, at least the container of the paper base material has polyethyleneimine on the inner surface side. Thereby, the excellent formability and adhesiveness of the thermoplastic resin layer can be obtained. In order to impart polyethyleneimine to the inner surface of the paper substrate, it is preferable to perform a backside treatment such as applying or impregnating the backside of the paper substrate with an aqueous solution of polyethyleneimine. Depending on the wettability of the aqueous solution and the type of thermoplastic resin, polyvinyl alcohol, starch, polyacrylamide, acrylic resin, styrene-butadiene resin, styrene-isoprene resin, polyester resin, ethylene-vinyl acetate resin, acetic acid A vinyl-vinyl alcohol resin, a urethane resin, a fluorine resin, or the like can be used in combination.
本発明では、紙基材のポリエチレンイミンを有する面とは反対側の表面に軽質炭酸カルシウムを含む特定の顔料塗工層を備えることにより、表裏が密着してしまうブロッキング現象を生じる恐れがないため、特段の乾燥工程を設けることなく、水溶液を用いた裏面処理を行うことができる。 In the present invention, by providing a specific pigment coating layer containing light calcium carbonate on the surface of the paper substrate opposite to the surface having polyethyleneimine, there is no possibility of causing a blocking phenomenon in which the front and back are in close contact with each other. The backside treatment using an aqueous solution can be performed without providing a special drying step.
ポリエチレンイミンを用いた裏面処理の方法としては、特に限定されないが、例えばバーコーター、ブレードコーター、エアーナイフコーター、ロッドコーター、ビルブレードコーター、ベルバパーコーター、並びにゲートロールコーター、サイズプレス及びカレンダーサイズプレス等が挙げられる。 The backside treatment method using polyethyleneimine is not particularly limited. For example, a bar coater, a blade coater, an air knife coater, a rod coater, a bill blade coater, a bellbaper coater, a gate roll coater, a size press and a calendar size press. Etc.
これらの方法の中でも、本発明における顔料塗工層は、強度に優れ、カレンダー等による平滑化処理で塗工層が脱落する恐れがないことから、塗工工程と平滑化処理を同時に行うことができるカレンダー塗工によりポリエチレンイミンを付与する態様が本発明の効果を遺憾なく発揮できるため、好ましい。この場合、顔料塗工層側には、カール矯正の観点から水塗りを行なうことが好ましい。 Among these methods, the pigment coating layer in the present invention is excellent in strength, and since there is no risk of the coating layer falling off by a smoothing process such as a calendar, the coating process and the smoothing process can be performed simultaneously. Since the aspect which provides polyethyleneimine by the calendering which can be performed can fully exhibit the effect of this invention, it is preferable. In this case, it is preferable to apply water to the pigment coating layer side from the viewpoint of curl correction.
紙基材の容器として内面となる側が有するポリエチレンイミンの存在量は、特に限定されないが、乾燥重量で０．０２〜０．５ｇ／ｍ２程度が好ましく、０．０４〜０．２ｇ／ｍ２程度がより好ましい。０．０２ｇ／ｍ２以上とすることにより、熱可塑性樹脂層の形成性、密着性をより一層向上することができる。一方、０．５ｇ／ｍ２を超えると形成性、密着性が飽和してむしろ低下傾向となるため、０．５ｇ／ｍ２以下とすることが好ましい。 The amount of polyethyleneimine present on the inner surface of the paper base container is not particularly limited, but is preferably about 0.02 to 0.5 g / m 2 by dry weight, and 0.04 to 0.2 g / m 2. The degree is more preferable. By setting it as 0.02 g / m < 2 > or more, the formability of a thermoplastic resin layer and adhesiveness can be improved further. On the other hand, if it exceeds 0.5 g / m 2 , the formability and adhesiveness are saturated and rather tend to be lowered, so 0.5 g / m 2 or less is preferable.
本発明を実施例により更に詳しく説明するが、本発明はこれらにより限定されるものではない。なお、特に断わらない限り、「部」及び「％」は、それぞれ「質量部」及び「質量％」を示す。 The present invention will be described in more detail with reference to examples, but the present invention is not limited thereto. Unless otherwise specified, “part” and “%” indicate “part by mass” and “% by mass”, respectively.
実施例１
（紙基材の作製）
パルプ原料としてＮＢＫＰ３６部、ＬＢＫＰ６４部を混合叩解し、カナダ標準濾水度４００ｍｌの表裏層用パルプスラリーを得た。得られたパルプスラリーを用いて、前記パルプ原料１００部に対して、内添紙力増強剤としてポリアクリルアミド（荒川化学工業製、ポリストロン１１７）０．８４部、内添サイズ剤としてロジン系サイズ剤（荒川化学工業製、サイズパインＮ‐７７１）０．６８部、硫酸アルミニウム２．０部をそれぞれ固形分量で混合し、表裏層用の紙料を調成した。
Example 1
(Preparation of paper substrate)
As a pulp raw material, 36 parts of NBKP and 64 parts of LBKP were mixed and beaten to obtain a pulp slurry for front and back layers having a Canadian standard freeness of 400 ml. Using the obtained pulp slurry, with respect to 100 parts of the pulp raw material, 0.84 part of polyacrylamide (manufactured by Arakawa Chemical Industries, Polystron 117) as an internal paper strength enhancer, and rosin size as an internal additive sizing agent An agent (Arakawa Chemical Industries, Size Pine N-771) 0.68 part and 2.0 parts of aluminum sulfate were mixed in solid amounts, respectively, to prepare a stock for the front and back layers.
パルプ原料としてＮＢＫＰ１５部、ＬＢＫＰ８５部を混合叩解し、カナダ標準濾水度３８０ｍｌの中層用パルプスラリーを得た。得られたパルプスラリーを用いて、前記パルプ原料１００部に対して、内添紙力増強剤としてポリアクリルアミド（荒川化学工業製、ポリストロン１１７）０．３部、内添サイズ剤としてロジン系サイズ剤（荒川化学工業製、サイズパインＮ‐７７１）０．５部、硫酸アルミニウム１．９部をそれぞれ固形分量で混合し中層用の紙料を調成した。 15 parts of NBKP and 85 parts of LBKP were mixed and beaten as pulp raw materials to obtain a pulp slurry for middle layer of Canadian standard freeness of 380 ml. Using the obtained pulp slurry, with respect to 100 parts of the pulp raw material, 0.3 part of polyacrylamide (manufactured by Arakawa Chemical Co., Ltd., Polystron 117) as an internal paper strength enhancer, and rosin size as an internal additive sizing agent 0.5 parts of the agent (manufactured by Arakawa Chemical Industry Co., Ltd., Size Pine N-771) and 1.9 parts of aluminum sulfate were mixed in solid amounts to prepare a stock for the middle layer.
これらの紙料を用いて５層構造で抄紙し、坪量２９０ｇ／ｍ２の容器用原紙の紙基材を得た。 Using these stocks, paper was made in a five-layer structure to obtain a paper base material for container base paper having a basis weight of 290 g / m 2 .
（顔料塗工層用塗料の調成）
顔料として、カオリン（ＢＡＳＦ製、ウルトラホワイト９０）５０部、軽質炭酸カルシウム（奥多摩工業製、ＴＰ１２３ＣＳ）５０部を使用し、分散剤としてポリアクリル酸ナトリウム（東亞合成製、アロンＴ５０）０．４部をそれぞれ固形分量で混合し、コーレス分散機を用いて固形分濃度が５９％の顔料スラリーを調成した。
(Preparation of paint for pigment coating layer)
As a pigment, 50 parts of kaolin (manufactured by BASF, Ultra White 90) and 50 parts of light calcium carbonate (manufactured by Okutama Kogyo Co., Ltd., TP123CS) are used and 0.4 part of sodium polyacrylate (manufactured by Toagosei Co., Ltd., Aron T50) Were mixed in solid amounts, and a pigment slurry having a solid content concentration of 59% was prepared using a Coreless disperser.
上記の顔料スラリーを用いて、前記顔料の全固形分量１００部に対して、酸化澱粉（王子コーンスターチ製、ＧＲＳ‐Ｔ１１０）６部、ゲル分率８０％、Ｔｇ７℃のスチレン‐ブタジエン共重合体ラテックス（以下、ラテックスＡともいう）１９部をそれぞれ固形分量で混合し、さらに水を加えて固形分濃度４５％の塗料を調成した。 Using the above pigment slurry, styrene-butadiene copolymer latex with 6 parts of oxidized starch (manufactured by Oji Cornstarch, GRS-T110), 80% gel fraction, and Tg of 7 ° C with respect to 100 parts of the total solid content of the pigment. 19 parts (hereinafter also referred to as latex A) were mixed in solid amounts, and water was further added to prepare a paint having a solid content concentration of 45%.
（容器用原紙の作製）
かくして得られた顔料塗工層用塗料を用いて、上記で得られた紙基材表面に、乾燥質量１０ｇ／ｍ２となるようにワイヤーバーを用いて塗工し、更に乾燥させて顔料塗工層を形成した後、金属ロールとウールロールの組合せからなるカレンダーに通紙した。更に、紙基材裏面にプレーンバーを用いて固形分濃度１％のポリエチレンイミン水溶液を乾燥重量で０．２ｇ／ｍ２塗布し、容器用原紙を得た。
(Preparation of container base paper)
Using the pigment coating layer paint thus obtained, the paper substrate surface obtained above was coated with a wire bar so as to have a dry mass of 10 g / m 2, and further dried to obtain a pigment coating. After the construction layer was formed, the paper was passed through a calendar composed of a combination of a metal roll and a wool roll. Furthermore, 0.2 g / m 2 of a polyethyleneimine aqueous solution having a solid content concentration of 1% was applied by dry weight on the back surface of the paper substrate using a plain bar to obtain a base paper for containers.
実施例２
実施例１の顔料塗工層用塗料の調成において、塗料の酸化澱粉の量を６部に代えて２部とした以外は、実施例１と同様にして容器用原紙を得た。
Example 2
A base paper for containers was obtained in the same manner as in Example 1 except that in preparing the pigment coating layer paint of Example 1, the amount of oxidized starch in the paint was changed to 2 parts instead of 6 parts.
実施例３
実施例１の顔料塗工層用塗料の調成において、塗料の酸化澱粉の量を６部に代えて４部とした以外は、実施例１と同様にして容器用原紙を得た。
Example 3
A base paper for containers was obtained in the same manner as in Example 1 except that the amount of oxidized starch in the paint was changed to 4 parts instead of 6 parts in the preparation of the paint for the pigment coating layer of Example 1.
実施例４
実施例１の顔料塗工層用塗料の調成において、塗料の酸化澱粉の量を６部に代えて１２部とした以外は、実施例１と同様にして容器用原紙を得た。
Example 4
A base paper for containers was obtained in the same manner as in Example 1 except that the amount of oxidized starch in the paint was changed to 12 parts instead of 6 parts in the preparation of the paint for the pigment coating layer of Example 1.
実施例５
実施例１の顔料塗工層用塗料の調成において、カオリンの量を５０部に代えて６０部とし、軽質炭酸カルシウムの量を５０部に代えて４０部とした以外は、実施例１と同様にして容器用原紙を得た。
Example 5
In preparation of the paint for a pigment coating layer of Example 1, the amount of kaolin was changed to 60 parts instead of 50 parts, and the amount of light calcium carbonate was changed to 40 parts instead of 50 parts. A container base paper was obtained in the same manner.
実施例６
実施例１の顔料塗工層用塗料の調成において、カオリンの量を５０部に代えて３５部とし、軽質炭酸カルシウムの量を５０部に代えて６５部とした以外は、実施例１と同様にして容器用原紙を得た。
Example 6
In preparation of the paint for a pigment coating layer of Example 1, the amount of kaolin was 35 parts instead of 50 parts, and the amount of light calcium carbonate was 65 parts instead of 50 parts. A container base paper was obtained in the same manner.
実施例７
実施例１の顔料塗工層用塗料の調成において、酸化澱粉に代えてカゼイン（日成共益製、アラシッド）を用いた以外は、実施例１と同様にして容器用原紙を得た。
Example 7
A base paper for containers was obtained in the same manner as in Example 1 except that in the preparation of the paint for the pigment coating layer of Example 1, casein (Nisshi Kyoyoku, Arashid) was used instead of oxidized starch.
実施例８
実施例１の顔料塗工層用塗料の調成において、ラテックスＡの量を１９部に代えて１４．５部とした以外は、実施例１と同様にして容器用原紙を得た。
Example 8
A base paper for containers was obtained in the same manner as in Example 1 except that the amount of latex A was changed to 14.5 parts instead of 19 parts in the preparation of the pigment coating layer paint of Example 1.
実施例９
実施例１の顔料塗工層用塗料の調成において、ラテックスＡの量を１９部に代えて２２部とした以外は、実施例１と同様にして容器用原紙を得た。
Example 9
A container base paper was obtained in the same manner as in Example 1 except that the amount of latex A was changed to 22 parts instead of 19 parts in the preparation of the pigment coating layer paint of Example 1.
実施例１０
実施例１の顔料塗工層用塗料の調成において、ラテックスＡに代えて、ゲル分率８７％、Ｔｇ−３４℃のスチレン‐ブタジエン共重合体ラテックス（以下、ラテックスＢともいう）を用いた以外は、実施例１と同様にして容器用原紙を得た。
Example 10
In preparation of the pigment coating layer coating material of Example 1, instead of latex A, a styrene-butadiene copolymer latex (hereinafter also referred to as latex B) having a gel fraction of 87% and Tg-34 ° C. was used. Except for the above, a container base paper was obtained in the same manner as in Example 1.
実施例１１
実施例１の顔料塗工層用塗料の調成において、ラテックスＡに代えて、ゲル分率５６％、Ｔｇ１８℃のスチレン‐ブタジエン共重合体ラテックス（以下、ラテックスＣともいう）を用いた以外は、実施例１と同様にして容器用原紙を得た。
Example 11
In preparing the pigment coating layer paint of Example 1, instead of latex A, a styrene-butadiene copolymer latex (hereinafter also referred to as latex C) having a gel fraction of 56% and Tg of 18 ° C. was used. In the same manner as in Example 1, a container base paper was obtained.
実施例１２
実施例１の容器用原紙の作製に代えて、実施例１に記載の顔料塗工層用塗料と紙基材を用いて、紙基材表面に乾燥質量５ｇ／ｍ２となるようにプレーンバーを用いて塗工し、この塗料が湿潤状態のうちに塗工面上に同じ塗料を乾燥質量５ｇ／ｍ２となるようにプレーンバーを用いて重ねて塗工し、その後乾燥させて顔料塗工層を形成した。更に、カレンダーで平滑化処理をするとともに、カレンダー塗工により紙基材裏面に固形分濃度０．８６％のポリエチレンイミン水溶液を乾燥重量で０．０４ｇ／ｍ２塗布し、容器用原紙を得た。
Example 12
Instead of producing the container base paper of Example 1, using the pigment coating layer coating material described in Example 1 and a paper base material, a plain bar having a dry mass of 5 g / m 2 on the paper base material surface was obtained. While the paint is wet, apply the same paint on the coated surface with a plain bar so that the dry mass is 5 g / m 2, and then dry and apply the pigment. A layer was formed. In addition, a smoothing process was performed with a calendar, and a polyethyleneimine aqueous solution having a solid content concentration of 0.86% was applied to the back surface of the paper substrate by calendar coating to a dry weight of 0.04 g / m 2 to obtain a base paper for containers. .
実施例１３
実施例１の顔料塗工層用塗料の調成において、塗料の酸化澱粉の量を６部に代えて９部とした以外は、実施例１と同様にして容器用原紙を得た。
Example 13
A container base paper was obtained in the same manner as in Example 1 except that the amount of oxidized starch in the paint was 9 parts instead of 6 parts in the preparation of the paint for the pigment coating layer of Example 1.
実施例１４
実施例１の顔料塗工層用塗料の調成において、カオリンの量を５０部に代えて５５部とし、軽質炭酸カルシウムの量を５０部に代えて４５部とした以外は、実施例１と同様にして容器用原紙を得た。
Example 14
In the preparation of the paint for a pigment coating layer in Example 1, the amount of kaolin was changed to 55 parts instead of 50 parts, and the amount of light calcium carbonate was changed to 45 parts instead of 50 parts. A container base paper was obtained in the same manner.
実施例１５
実施例１の顔料塗工層用塗料の調成において、カオリンの量を５０部に代えて４０部とし、軽質炭酸カルシウムの量を５０部に代えて６０部とした以外は、実施例１と同様にして容器用原紙を得た。
Example 15
In the preparation of the paint for a pigment coating layer of Example 1, the amount of kaolin was changed to 40 parts instead of 50 parts, and the amount of light calcium carbonate was changed to 50 parts instead of 50 parts. A container base paper was obtained in the same manner.
実施例１６
実施例１の顔料塗工層用塗料の調成において、ラテックスＡの量を１９部に代えて１５．０部とした以外は、実施例１と同様にして容器用原紙を得た。
Example 16
A container base paper was obtained in the same manner as in Example 1 except that the amount of latex A was changed to 15.0 parts instead of 19 parts in preparing the pigment coating layer paint of Example 1.
実施例１７
実施例１の顔料塗工層用塗料の調成において、ラテックスＡの量を１９部に代えて２０部とした以外は、実施例１と同様にして容器用原紙を得た。
Example 17
Container base paper was obtained in the same manner as in Example 1 except that the amount of latex A was changed to 20 parts instead of 19 parts in the preparation of the pigment coating layer paint of Example 1.
比較例１
実施例１の顔料塗工層用塗液の調成において、酸化澱粉を添加しなかった以外は、実施例１と同様にして容器用原紙を得た。
Comparative Example 1
In preparing the pigment coating layer coating solution of Example 1, a container base paper was obtained in the same manner as in Example 1 except that the oxidized starch was not added.
比較例２
実施例１の顔料塗工層用塗液の調成において、軽質炭酸カルシウムに代えて重質炭酸カルシウム（ファイマテック製、ＦＭＴ１００）を用いた以外は、実施例１と同様にして容器用原紙を得た。
Comparative Example 2
In the preparation of the coating liquid for the pigment coating layer of Example 1, the base paper for containers was prepared in the same manner as in Example 1 except that heavy calcium carbonate (manufactured by Pimatech, FMT100) was used instead of light calcium carbonate. Obtained.
比較例３
実施例１２において、固形分濃度０．８６％のポリエチレンイミン水溶液に代えて、固形分濃度０．８６％のポリビニルアルコール水溶液を用いた以外は、実施例１２と同様にして容器用原紙を得た。
Comparative Example 3
In Example 12, a base paper for containers was obtained in the same manner as in Example 12 except that a polyvinyl alcohol aqueous solution having a solid content concentration of 0.86% was used instead of the polyethyleneimine aqueous solution having a solid content concentration of 0.86%. .
比較例４
実施例１２において、カレンダー塗工により紙基材裏面に固形分濃度０．８６％のポリエチレンイミン水溶液を乾燥重量で０．０４ｇ／ｍ２塗布しなかったこと以外は、実施例１２と同様にして容器用原紙を得た。
Comparative Example 4
In Example 12, except that the solid content concentration 0.86% polyethylenimine aqueous solution was not 0.04 g / m 2 coating on a dry weight on the back paper substrate by a calender coating, in the same manner as in Example 12 A container base paper was obtained.
かくして得られた容器用原紙について、以下の評価を行った。その結果は、表１に示す通りであった。なお、容器用原紙は、ＪＩＳ Ｐ ８１１１に準じて前処理を行った。 The container base paper thus obtained was evaluated as follows. The results were as shown in Table 1. The container base paper was pretreated according to JIS P8111.
（塗料保水度）
ＡＡ‐ＧＷＲ保水度計（ＳＭＴ製）を用い、孔径０．４μｍフィルター、圧力１００ｋＰａ、接触時間３０秒の条件で測定した。数値が小さいほど保水性の良い塗料である。
(Paint water retention)
Using an AA-GWR water retention meter (manufactured by SMT), measurement was performed under conditions of a pore size 0.4 μm filter, a pressure of 100 kPa, and a contact time of 30 seconds. The smaller the value, the better the water retention.
（塗工層強度）
ＲＩ印刷機（明製作所）を用い、オフセットインキを使用して顔料塗工層上に印刷した後、塗工層強度（ピッキングの程度）を目視評価した。
○：塗工層強度が優れ、平滑化処理や折り曲げ加工といった過酷な条件での使用においても、塗工層の脱落の恐れが全くない
△：塗工層強度がやや優れ、平滑化処理や折り曲げ加工といった過酷な条件での使用において、条件によっては塗工層の脱落の恐れが僅かにある
×：塗工層強度が劣り、平滑化処理や折り曲げ加工といった過酷な条件での使用において、塗工層の脱落の恐れがある
(Coating layer strength)
After printing on the pigment coating layer using an offset ink using an RI printer (Ming Seisakusho), the coating layer strength (degree of picking) was visually evaluated.
○: Excellent coating layer strength, and there is no risk of the coating layer dropping off even under severe conditions such as smoothing or bending. Δ: Slightly superior coating layer strength, smoothing or bending. In use under severe conditions such as processing, there is a slight risk of the coating layer dropping off depending on the conditions. X: Coating layer strength is inferior, and coating is used in severe conditions such as smoothing and bending. There is a risk of falling off the layer
（グラビア印刷適性）
大蔵省式グラビア印刷試験機を用いてグラビア印刷を行い、網点の欠落の度合いを下記の基準で目視評価した。
○：全階調部分において、ほとんど網点の欠落が認められない
○’：階調部分（低階調部）によっては、やや網点の欠落が認められる
△：高階調部分にも若干の網点の欠落が認められる
×：全階調部分において、網点の欠落が数多く認められる
(Suitability for gravure printing)
Gravure printing was performed using a Ministry of Finance gravure printing tester, and the degree of dot missing was visually evaluated according to the following criteria.
○: Almost no halftone dots are observed in all gradation parts. ○ ': Some halftone dots are observed depending on the gradation parts (low gradation parts). Missing dots X: Many missing dots in all gradations
（密着性）
容器用原紙の裏面に低密度ポリエチレンからなる熱可塑性樹脂層を設け、容器用原紙と熱可塑性樹脂層との間の接着不良部分の有無を目視評価した。
○：接着不良の部分がない。
×：接着不良の部分がある。
(Adhesion)
A thermoplastic resin layer made of low-density polyethylene was provided on the back surface of the container base paper, and the presence or absence of poor adhesion between the container base paper and the thermoplastic resin layer was visually evaluated.
○: There is no portion with poor adhesion.
X: There exists a part of poor adhesion.
（白色度）
顔料塗工層側の白色度を分光白色度測色計（スガ試験機製、ＳＣ‐１０ＷＴ型）を用いて、ＪＩＳ Ｐ ８１４８に準じて測定した。
(Whiteness)
The whiteness of the pigment coating layer side was measured according to JIS P 8148 using a spectral whiteness colorimeter (manufactured by Suga Test Instruments Co., Ltd., SC-10WT type).
（光沢度）
顔料塗工層側の光沢度を光沢度計（村上色彩技術研究所製、ＧＭ‐２６Ｄ）を用いて、ＪＩＳ Ｚ ８７４１に準じて、入射角／受光角７５度の条件で測定した。
(Glossiness)
The glossiness on the pigment coating layer side was measured using a glossmeter (GM-26D, manufactured by Murakami Color Research Laboratory) under the conditions of an incident angle / light receiving angle of 75 degrees according to JIS Z 8741.
本発明により得られた容器用原紙は、印刷適性、熱可塑性樹脂層の形成性、密着性、及び製造、加工時における割れ、紙粉の抑制性に優れるため、一般食品用、酸性食品用、液体用などの紙容器に適するものであり、特にヨーグルト等の食品用途向けに好適に使用できる。 Since the container base paper obtained by the present invention is excellent in printability, thermoplastic resin layer formability, adhesion, and cracking during production and processing, paper powder suppression, for general foods, acidic foods, It is suitable for paper containers for liquids and can be suitably used especially for food applications such as yogurt.
Claims (7)
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| WO2024143393A1 (en) * | 2022-12-27 | 2024-07-04 | 王子ホールディングス株式会社 | Water-resistant paper and packaging container |
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| JPH04108199A (en) * | 1990-08-28 | 1992-04-09 | Kanzaki Paper Mfg Co Ltd | Making of matted coated paper |
| JP3020858B2 (en) * | 1995-12-07 | 2000-03-15 | 日本製紙株式会社 | Paper container base paper |
| US5776619A (en) * | 1996-07-31 | 1998-07-07 | Fort James Corporation | Plate stock |
| JP3535047B2 (en) * | 1999-07-16 | 2004-06-07 | 日産車体株式会社 | Under cover for FF vehicles |
| JP2004017984A (en) * | 2002-06-13 | 2004-01-22 | Dainippon Printing Co Ltd | Layered body of paper container for retort processing, and paper container for retort processing |
| JP2005047083A (en) * | 2003-07-31 | 2005-02-24 | Daio Paper Corp | Liner for ink jet recording and its manufacturing method |
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| JP4523398B2 (en) * | 2004-12-14 | 2010-08-11 | 日清食品ホールディングス株式会社 | Method for producing a heat insulating foamed paper container |
| JP2006328574A (en) * | 2005-05-24 | 2006-12-07 | Oji Paper Co Ltd | Coated white paperboard |
| JP5470980B2 (en) * | 2008-06-30 | 2014-04-16 | 王子ホールディングス株式会社 | Manufacturing method of multilayer paper base material for chip type electronic component storage mount |
| JP2010144286A (en) * | 2008-12-19 | 2010-07-01 | Oji Paper Co Ltd | Paper base material for liquid container |
| JP2011208333A (en) * | 2010-03-31 | 2011-10-20 | Oji Paper Co Ltd | Regenerated postcard paper |
| JP5625655B2 (en) * | 2010-09-14 | 2014-11-19 | 王子ホールディングス株式会社 | Coated white paperboard |
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