JP7384117B2 - Book paper and its manufacturing method - Google Patents
Book paper and its manufacturing method Download PDFInfo
- Publication number
- JP7384117B2 JP7384117B2 JP2020103014A JP2020103014A JP7384117B2 JP 7384117 B2 JP7384117 B2 JP 7384117B2 JP 2020103014 A JP2020103014 A JP 2020103014A JP 2020103014 A JP2020103014 A JP 2020103014A JP 7384117 B2 JP7384117 B2 JP 7384117B2
- Authority
- JP
- Japan
- Prior art keywords
- less
- book paper
- paper
- pulp
- book
- Prior art date
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Links
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 239000000123 paper Substances 0.000 claims description 170
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 45
- 239000000835 fiber Substances 0.000 claims description 37
- 238000000034 method Methods 0.000 claims description 23
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 22
- 230000003746 surface roughness Effects 0.000 claims description 20
- 239000002994 raw material Substances 0.000 claims description 18
- 208000005156 Dehydration Diseases 0.000 claims description 14
- 230000018044 dehydration Effects 0.000 claims description 14
- 238000006297 dehydration reaction Methods 0.000 claims description 14
- 229920000642 polymer Polymers 0.000 claims description 12
- 239000000470 constituent Substances 0.000 claims description 8
- 239000004067 bulking agent Substances 0.000 claims description 7
- 238000010998 test method Methods 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 6
- 239000002356 single layer Substances 0.000 claims description 4
- 239000011247 coating layer Substances 0.000 claims description 3
- 239000000178 monomer Substances 0.000 description 24
- 229920001131 Pulp (paper) Polymers 0.000 description 21
- 239000002655 kraft paper Substances 0.000 description 20
- 239000000523 sample Substances 0.000 description 19
- -1 alkyl ketene dimer Chemical compound 0.000 description 18
- 238000005259 measurement Methods 0.000 description 15
- 239000011121 hardwood Substances 0.000 description 12
- 239000003795 chemical substances by application Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 239000013055 pulp slurry Substances 0.000 description 9
- 150000003839 salts Chemical class 0.000 description 9
- 229920002554 vinyl polymer Polymers 0.000 description 9
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 8
- 125000000129 anionic group Chemical group 0.000 description 7
- 125000002091 cationic group Chemical group 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 7
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 150000003863 ammonium salts Chemical class 0.000 description 6
- 230000014759 maintenance of location Effects 0.000 description 6
- 159000000001 potassium salts Chemical class 0.000 description 6
- 238000004513 sizing Methods 0.000 description 6
- 229910052708 sodium Inorganic materials 0.000 description 6
- 239000011734 sodium Substances 0.000 description 6
- 239000011122 softwood Substances 0.000 description 6
- 125000001302 tertiary amino group Chemical group 0.000 description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 5
- 229910052783 alkali metal Inorganic materials 0.000 description 5
- 239000003623 enhancer Substances 0.000 description 5
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 4
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 3
- 229920000742 Cotton Polymers 0.000 description 3
- 239000004952 Polyamide Substances 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- 229920006319 cationized starch Polymers 0.000 description 3
- 150000001991 dicarboxylic acids Chemical class 0.000 description 3
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 150000002763 monocarboxylic acids Chemical class 0.000 description 3
- 239000013054 paper strength agent Substances 0.000 description 3
- 229920002647 polyamide Polymers 0.000 description 3
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 3
- 229940014800 succinic anhydride Drugs 0.000 description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 2
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- 229920000875 Dissolving pulp Polymers 0.000 description 2
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 description 2
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- 229920001407 Modal (textile) Polymers 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 2
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- 150000001242 acetic acid derivatives Chemical class 0.000 description 2
- 229920006322 acrylamide copolymer Polymers 0.000 description 2
- 238000007792 addition Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 235000012211 aluminium silicate Nutrition 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
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- GZUXJHMPEANEGY-UHFFFAOYSA-N bromomethane Chemical compound BrC GZUXJHMPEANEGY-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
- NEHMKBQYUWJMIP-UHFFFAOYSA-N chloromethane Chemical compound ClC NEHMKBQYUWJMIP-UHFFFAOYSA-N 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 125000004985 dialkyl amino alkyl group Chemical group 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 2
- 239000012766 organic filler Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 150000003009 phosphonic acids Chemical class 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- 150000003460 sulfonic acids Chemical class 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- 239000012209 synthetic fiber Substances 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- 150000000000 tetracarboxylic acids Chemical class 0.000 description 2
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 2
- 150000003628 tricarboxylic acids Chemical class 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- 239000001124 (E)-prop-1-ene-1,2,3-tricarboxylic acid Substances 0.000 description 1
- GSSDUXHQPXODCN-UHFFFAOYSA-N 1-phenylethenylphosphonic acid Chemical compound OP(O)(=O)C(=C)C1=CC=CC=C1 GSSDUXHQPXODCN-UHFFFAOYSA-N 0.000 description 1
- OEPOKWHJYJXUGD-UHFFFAOYSA-N 2-(3-phenylmethoxyphenyl)-1,3-thiazole-4-carbaldehyde Chemical compound O=CC1=CSC(C=2C=C(OCC=3C=CC=CC=3)C=CC=2)=N1 OEPOKWHJYJXUGD-UHFFFAOYSA-N 0.000 description 1
- 229920000536 2-Acrylamido-2-methylpropane sulfonic acid Polymers 0.000 description 1
- XHZPRMZZQOIPDS-UHFFFAOYSA-N 2-Methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid Chemical compound OS(=O)(=O)CC(C)(C)NC(=O)C=C XHZPRMZZQOIPDS-UHFFFAOYSA-N 0.000 description 1
- AGBXYHCHUYARJY-UHFFFAOYSA-N 2-phenylethenesulfonic acid Chemical compound OS(=O)(=O)C=CC1=CC=CC=C1 AGBXYHCHUYARJY-UHFFFAOYSA-N 0.000 description 1
- WOZHZOLFFPSEAM-UHFFFAOYSA-N 3-butene-1,2,3-tricarboxylic acid Chemical compound OC(=O)CC(C(O)=O)C(=C)C(O)=O WOZHZOLFFPSEAM-UHFFFAOYSA-N 0.000 description 1
- WHNPOQXWAMXPTA-UHFFFAOYSA-N 3-methylbut-2-enamide Chemical compound CC(C)=CC(N)=O WHNPOQXWAMXPTA-UHFFFAOYSA-N 0.000 description 1
- 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 1
- 229920002126 Acrylic acid copolymer Polymers 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 241000609240 Ambelania acida Species 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 208000034628 Celiac artery compression syndrome Diseases 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- 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 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- MZVQCMJNVPIDEA-UHFFFAOYSA-N [CH2]CN(CC)CC Chemical group [CH2]CN(CC)CC MZVQCMJNVPIDEA-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229940091181 aconitic acid Drugs 0.000 description 1
- 150000003926 acrylamides Chemical class 0.000 description 1
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 1
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 description 1
- 150000001350 alkyl halides Chemical class 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 239000010905 bagasse Substances 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- AGEZXYOZHKGVCM-UHFFFAOYSA-N benzyl bromide Chemical compound BrCC1=CC=CC=C1 AGEZXYOZHKGVCM-UHFFFAOYSA-N 0.000 description 1
- KCXMKQUNVWSEMD-UHFFFAOYSA-N benzyl chloride Chemical compound ClCC1=CC=CC=C1 KCXMKQUNVWSEMD-UHFFFAOYSA-N 0.000 description 1
- 229940073608 benzyl chloride Drugs 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 239000004917 carbon fiber Substances 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
- 239000000919 ceramic Substances 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- GTZCVFVGUGFEME-IWQZZHSRSA-N cis-aconitic acid Chemical compound OC(=O)C\C(C(O)=O)=C\C(O)=O GTZCVFVGUGFEME-IWQZZHSRSA-N 0.000 description 1
- HNEGQIOMVPPMNR-IHWYPQMZSA-N citraconic acid Chemical compound OC(=O)C(/C)=C\C(O)=O HNEGQIOMVPPMNR-IHWYPQMZSA-N 0.000 description 1
- 229940018557 citraconic acid Drugs 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- DENRZWYUOJLTMF-UHFFFAOYSA-N diethyl sulfate Chemical compound CCOS(=O)(=O)OCC DENRZWYUOJLTMF-UHFFFAOYSA-N 0.000 description 1
- 229940008406 diethyl sulfate Drugs 0.000 description 1
- VAYGXNSJCAHWJZ-UHFFFAOYSA-N dimethyl sulfate Chemical compound COS(=O)(=O)OC VAYGXNSJCAHWJZ-UHFFFAOYSA-N 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000004675 formic acid derivatives Chemical class 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 125000003055 glycidyl group Chemical group C(C1CO1)* 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 150000003840 hydrochlorides Chemical class 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 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
- 238000000691 measurement method Methods 0.000 description 1
- FQPSGWSUVKBHSU-UHFFFAOYSA-N methacrylamide Chemical compound CC(=C)C(N)=O FQPSGWSUVKBHSU-UHFFFAOYSA-N 0.000 description 1
- 229920003145 methacrylic acid copolymer Polymers 0.000 description 1
- 229940102396 methyl bromide Drugs 0.000 description 1
- 229940050176 methyl chloride Drugs 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000569 multi-angle light scattering Methods 0.000 description 1
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000010893 paper waste Substances 0.000 description 1
- OAUDNTNYSCNXJD-UHFFFAOYSA-N pent-1-ene-1,1,4,4-tetracarboxylic acid Chemical compound OC(=O)C(C(O)=O)(C)CC=C(C(O)=O)C(O)=O OAUDNTNYSCNXJD-UHFFFAOYSA-N 0.000 description 1
- RGNRTCKDPBJEHU-UHFFFAOYSA-N pent-4-ene-1,2,3,4-tetracarboxylic acid Chemical compound OC(=O)CC(C(O)=O)C(C(O)=O)C(=C)C(O)=O RGNRTCKDPBJEHU-UHFFFAOYSA-N 0.000 description 1
- QWFQZTFNZZNHLR-UHFFFAOYSA-N pent-4-ene-1,2,4-tricarboxylic acid Chemical compound OC(=O)CC(C(O)=O)CC(=C)C(O)=O QWFQZTFNZZNHLR-UHFFFAOYSA-N 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
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- 229940088417 precipitated calcium carbonate Drugs 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- UIIIBRHUICCMAI-UHFFFAOYSA-N prop-2-ene-1-sulfonic acid Chemical compound OS(=O)(=O)CC=C UIIIBRHUICCMAI-UHFFFAOYSA-N 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
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- 230000001953 sensory effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229910021647 smectite Inorganic materials 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- GTZCVFVGUGFEME-UHFFFAOYSA-N trans-aconitic acid Natural products OC(=O)CC(C(O)=O)=CC(O)=O GTZCVFVGUGFEME-UHFFFAOYSA-N 0.000 description 1
- 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 1
- 230000007704 transition Effects 0.000 description 1
- 125000005208 trialkylammonium group Chemical group 0.000 description 1
- ZTWTYVWXUKTLCP-UHFFFAOYSA-N vinylphosphonic acid Chemical compound OP(O)(=O)C=C ZTWTYVWXUKTLCP-UHFFFAOYSA-N 0.000 description 1
- NLVXSWCKKBEXTG-UHFFFAOYSA-N vinylsulfonic acid Chemical compound OS(=O)(=O)C=C NLVXSWCKKBEXTG-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Landscapes
- Paper (AREA)
Description
本発明は、書籍用紙およびその製造方法に関する。 The present invention relates to book paper and a method for manufacturing the same.
書籍用紙には、その用途から、しなやかであり、ページのめくりやすさまたは良好な手触り感が求められる。
特許文献１には、十分な紙の強度を有し、しなやかであり、ページのめくりやすさ、手触り感に優れた書籍用紙を提供することを目的として、用紙坪量に対して１質量％～５質量％の含有量となるよう水溶性金属塩を塗布してなり、用紙の横目方向のクラーク剛直度が３５ｃｍ３／１００～５５ｃｍ３／１００の範囲であることを特徴とする書籍用紙が開示されている。
また、特許文献２には、高白色度であり、かつ極めて低密度、柔軟（剛度が低い）で、しかも印刷適性に優れ、ブリード（印刷滲み）が発生しない嵩高中質印刷用紙を提供することを目的として、リファイナーグランドウッドパルプ、サーモメカニカルパルプ、ケミサーモメカニカルパルプ、アルカリ過酸化水素メカニカルパルプまたはアルカリ過酸化水素サーモメカニカルパルプから選ばれる１種類以上の広葉樹機械パルプと、嵩高剤とを少なくとも含有してなる紙料を、抄紙して得られる原紙の表面に澱粉系紙力剤を塗工してなる、密度が０．３５～０．５０ｇ／ｃｍ３であることを特徴とする嵩高中質印刷用紙が開示されている。
Due to its intended use, book paper is required to be flexible, easy to turn pages, and have a good feel to the touch.
Patent Document 1 discloses that, with the aim of providing book paper that has sufficient paper strength, is flexible, and has excellent page turning and texture, 1% by mass or more based on the basis weight of the paper. A book paper is disclosed, which is coated with a water-soluble metal salt to have a content of 5% by mass, and has a Clark stiffness in the cross-grain direction of the paper in the range of 35 cm 3 /100 to 55 cm 3 /100. has been done.
Further, Patent Document 2 discloses that there is provided a bulky medium-quality printing paper that has high whiteness, extremely low density, flexibility (low stiffness), excellent printability, and does not cause bleed (print blur). containing at least one or more types of hardwood mechanical pulp selected from refiner ground wood pulp, thermomechanical pulp, chemi-thermomechanical pulp, alkaline hydrogen peroxide mechanical pulp or alkaline hydrogen peroxide thermomechanical pulp, and a bulking agent. A bulky medium-quality paper having a density of 0.35 to 0.50 g/cm 3 , which is obtained by coating a starch-based paper strength agent on the surface of a base paper obtained by paper-making a paper stock made of A printing paper is disclosed.
特許文献１に記載された書籍用紙では、水溶性金属塩を塗布することにより柔軟性を付与しており、製造工程上、経済合理性に欠けるという問題があった。また、特許文献２に記載の発明では、嵩高剤を含有するものであり、同様に、製造工程上、経済合理性に欠けるという問題があった。さらに、特許文献１および２では、塗工した面の手触り感は向上するものの、裏面（非塗工面）の手触り感に劣るという問題があった。
本発明は、表裏のいずれにおいても手触り感に優れ、かつ、書籍用紙として使用性を満足する紙質強度を有する書籍用紙、およびその製造方法を提供することを目的とする。
In the book paper described in Patent Document 1, flexibility is imparted by applying a water-soluble metal salt, and there is a problem in that it lacks economic rationality in terms of the manufacturing process. Furthermore, the invention described in Patent Document 2 contains a bulking agent, and similarly has the problem of lacking economic rationality in terms of the manufacturing process. Furthermore, in Patent Documents 1 and 2, although the texture of the coated surface is improved, there is a problem that the texture of the back surface (non-coated surface) is inferior.
An object of the present invention is to provide a book paper that has an excellent feel to the touch on both the front and back sides and has a paper strength that satisfies the usability as a book paper, and a method for manufacturing the same.
本発明者は、書籍用紙のＫＥＳ試験法により測定した平均ＳＭＤの値および表裏面のＳＭＤの差を特定の値以下とし、かつ、構成するパルプの加重平均繊維長を特定の値以下とし、坪量を特定の範囲とすることにより、上記の課題が解決されることを見出し、本発明を完成するに至った。
すなわち、本発明は、以下の＜１＞～＜１０＞に関する。
＜１＞ ＫＥＳ試験法により測定した縦横平均の表面粗さ（平均ＳＭＤ）が、０．８００μｍ以下であり、かつ、表裏面のＳＭＤの差が０．０７０μｍ以下であり、構成するパルプ成分の長さ加重平均繊維長が０．９０ｍｍ以下であり、坪量が５０ｇ／ｍ２以上９０ｇ／ｍ２以下である、書籍用紙。
＜２＞ 前記書籍用紙が単層である、＜１＞に記載の書籍用紙。
＜３＞ 前記書籍用紙を構成するパルプ成分の平均繊維幅が１５．０μｍ以下である、＜１＞または＜２＞に記載の書籍用紙。
＜４＞ 前記書籍用紙を構成するパルプ成分のルンケル比が０．９以下である、＜１＞～＜３＞のいずれかに記載の書籍用紙。
＜５＞ 密度が０．６５０ｇ／ｃｍ３以上である、＜１＞～＜４＞のいずれかに記載の書籍用紙。
＜６＞ 縦横平均の比引張強さが４０．０Ｎ・ｍ／ｇ以上である、＜１＞～＜５＞のいずれかに記載の書籍用紙。
＜７＞ 前記書籍用紙の固形分中の嵩高剤の配合量が０．１質量％以下である、＜１＞～＜６＞のいずれかに記載の書籍用紙。
＜８＞ 前記書籍用紙が予め両性ポリマーにより処理した炭酸カルシウムを配合してなる、＜１＞～＜７＞のいずれかに記載の書籍用紙。
＜９＞ ＜１＞～＜８＞のいずれかに記載の書籍用紙の製造方法であって、両面脱水型抄紙機で抄紙する工程を有する、書籍用紙の製造方法。
＜１０＞前記両面脱水型抄紙機における一次脱水時のプレス線圧が３０ｋＮ／ｍ以上９０ｋＮ／ｍ以下であり、二次脱水時のプレス線圧が７０ｋＮ／ｍ以上１３０ｋＮ／ｍ以下である、＜９＞に記載の書籍用紙の製造方法。
The present inventor set the average SMD value measured by the KES test method of book paper and the difference between the SMD of the front and back sides to be below a specific value, and set the weighted average fiber length of the constituent pulp to below a specific value. The inventors have discovered that the above problems can be solved by setting the amount within a specific range, and have completed the present invention.
That is, the present invention relates to the following <1> to <10>.
<1> The vertical and horizontal average surface roughness (average SMD) measured by the KES test method is 0.800 μm or less, the difference in SMD between the front and back surfaces is 0.070 μm or less, and the length of the constituent pulp components is A book paper having a weighted average fiber length of 0.90 mm or less and a basis weight of 50 g/m 2 or more and 90 g/m 2 or less.
<2> The book paper according to <1>, wherein the book paper is a single layer.
<3> The book paper according to <1> or <2>, wherein the average fiber width of the pulp component constituting the book paper is 15.0 μm or less.
<4> The book paper according to any one of <1> to <3>, wherein the Runkel ratio of the pulp component constituting the book paper is 0.9 or less.
<5> The book paper according to any one of <1> to <4>, which has a density of 0.650 g/cm 3 or more.
<6> The book paper according to any one of <1> to <5>, which has a vertical and horizontal average specific tensile strength of 40.0 N·m/g or more.
<7> The book paper according to any one of <1> to <6>, wherein the amount of the bulking agent in the solid content of the book paper is 0.1% by mass or less.
<8> The book paper according to any one of <1> to <7>, wherein the book paper is blended with calcium carbonate that has been previously treated with an amphoteric polymer.
<9> The method for manufacturing book paper according to any one of <1> to <8>, which comprises a step of making paper using a double-sided dehydrating paper machine.
<10> In the double-sided dewatering paper machine, the press linear pressure during primary dehydration is 30 kN/m or more and 90 kN/m or less, and the press linear pressure during secondary dehydration is 70 kN/m or more and 130 kN/m or less, <9>, the method for producing book paper according to item 9.
本発明によれば、表裏のいずれにおいても手触り感に優れ、かつ、書籍用紙として使用性を満足する紙質強度を有する書籍用紙、およびその製造方法を提供することができる。 According to the present invention, it is possible to provide book paper that is excellent in feel to the touch on both the front and back sides and has paper strength that satisfies usability as book paper, and a method for manufacturing the same.
［書籍用紙］
本発明の書籍用紙は、ＫＥＳ試験法により測定した縦横平均の表面粗さ（平均ＳＭＤ）が、０．８００μｍ以下であり、かつ、表裏面のＳＭＤの差が０．０７０μｍ以下であり、構成するパルプ成分の長さ加重平均繊維長が０．９０ｍｍ以下であり、坪量が５０ｇ／ｍ２以上９０ｇ／ｍ２以下である。
本発明の書籍用紙は、表裏いずれにおいても手触り感にすぐれ、かつ、書籍用紙として使用性を満足する紙質強度を有する。
上述の効果が得られる理由として、一部は以下のように考えられる。
ＫＥＳ試験法により測定した縦横平均の表面粗さ（平均ＳＭＤ）を、０．８００μｍ以下とし、かつ、表裏面のＳＭＤの差を０．０７０μｍ以下とするとともに、構成するパルプ成分の長さ平均繊維長を０．９０ｍｍ以下とすることにより、表裏面のいずれにおいても手触り感に優れる書籍用紙が得られたと考えられる。また、坪量を５０ｇ／ｍ２以上９０ｇ／ｍ２以下とすることにより、書籍用紙として必要な強度が得られたものと考えられる。
以下、本発明の書籍用紙について詳述する。
[Book paper]
The book paper of the present invention has a vertical and horizontal average surface roughness (average SMD) of 0.800 μm or less as measured by the KES test method, and a difference in SMD between the front and back surfaces of 0.070 μm or less. The length weighted average fiber length of the pulp component is 0.90 mm or less, and the basis weight is 50 g/m 2 or more and 90 g/m 2 or less.
The book paper of the present invention has excellent feel to the touch on both the front and back sides, and has paper strength that satisfies usability as book paper.
Some of the reasons why the above effects can be obtained are considered as follows.
The vertical and horizontal average surface roughness (average SMD) measured by the KES test method should be 0.800 μm or less, and the difference in SMD between the front and back surfaces should be 0.070 μm or less, and the length-average fibers of the constituent pulp components should be It is believed that by setting the length to 0.90 mm or less, book paper with excellent texture on both the front and back surfaces was obtained. Further, it is considered that the strength necessary for book paper was obtained by setting the basis weight to 50 g/m 2 or more and 90 g/m 2 or less.
Hereinafter, the book paper of the present invention will be explained in detail.
＜平均ＳＭＤ＞
本発明の書籍用紙は、ＫＥＳ試験法により測定した縦横平均の表面粗さ（平均ＳＭＤ）が、０．８００μｍ以下である。平均ＳＭＤは、手触り感に優れる書籍用紙とする観点から、好ましくは０．７６０μｍ以下、より好ましくは０．７２０μｍ以下、さらに好ましくは０．７００μｍ以下、よりさらに好ましくは０．６８０μｍ以下である。
ＫＥＳ試験法により測定した縦横平均の表面粗さ（平均ＳＭＤ）は、次のようにして測定するものである。縦方向（抄紙機の進行方向、以下、「ＭＤ方向」ともいう。）について測定する場合には、表面試験機ＫＥＳ－ＦＢ４（カトーテック株式会社製、ＫＥＳ－ＦＢシステム）に試料を測定方向がＭＤ方向と平行になるように、張力２０ｇｆ／ｃｍの張力でセットする。測定子は、測定幅５ｍｍとなるようにした直径０．５ｍｍのピアノ線で構成されており、測定子を通して試料表面に１０ｇｆの荷重が付与されている。サンプルを速度０．１ｃｍ／ｓｅｃでＭＤ方向と平行な方向に水平に移動させ、測定距離３ｃｍの間の試料の表面厚さの変動（μｍ）を測定する。その際、測定距離（測定子の移動距離）を横軸に、測定した表面厚さを縦軸にしたチャートを作成し、さらに表面厚さの平均値を求めて、各測定点における、表面厚さとその平均値との差の絶対値を算出する。この差の絶対値を横軸の測定距離で積分し（チャートにおいて、表面厚さの折れ線とその平均値の直線によって囲まれた部分の面積を求め）、さらにこの積分値を測定距離で割った値が表面粗さ（ＳＭＤ）である。なお、書籍用紙から切り出した３サンプルについて、任意の３箇所で測定し、得られた測定結果（ｎ＝９）の相加平均値を表面粗さ（ＳＭＤ）とする。測定方法の詳細は、公知文献、たとえば、近藤智吏；「紙の基本力学特性の測定とその風合いの計測」,機能紙研究会誌,No.28,p62-79(1989)等にも詳しく記述されている。
横方向（抄紙機の進行方向と直角な方向、以下、「ＣＤ方向」ともいう）について測定する場合には、同様に、表面試験機に試料をＣＤ方法に平行になるようにセットし、ＣＤ方向と平行な方向に水平に移行させて、表面厚さの変動を測定する。
また、ＣＤ方向における表面（Ｆ面）の表面粗さ（ＣＤ－Ｆ－ＳＭＤ）およびＣＤ方向における裏面（Ｗ面）の表面粗さ（ＣＤ－Ｗ－ＳＭＤ）を測定し、これらの相乗平均値を求めることで、横方向の表面粗さ（ＣＤ－ＳＭＤ）とする。本発明において、「平均ＳＭＤ」とは、縦方向の表面粗さ（ＭＤ－ＳＭＤ）と横方向の表面粗さ（ＣＤ－ＳＭＤ）との相乗平均値である。
<Average SMD>
The book paper of the present invention has an average vertical and horizontal surface roughness (average SMD) of 0.800 μm or less as measured by the KES test method. The average SMD is preferably 0.760 μm or less, more preferably 0.720 μm or less, even more preferably 0.700 μm or less, even more preferably 0.680 μm or less, from the viewpoint of producing book paper with excellent feel to the touch.
The vertical and horizontal average surface roughness (average SMD) measured by the KES test method is measured as follows. When measuring in the longitudinal direction (the direction in which the paper machine advances, hereinafter also referred to as the "MD direction"), place the sample on the surface tester KES-FB4 (manufactured by Kato Tech Co., Ltd., KES-FB System) with the measurement direction set. Set it with a tension of 20 gf/cm so that it is parallel to the MD direction. The probe was made of piano wire with a diameter of 0.5 mm and had a measurement width of 5 mm, and a load of 10 gf was applied to the sample surface through the probe. The sample is moved horizontally in a direction parallel to the MD direction at a speed of 0.1 cm/sec, and the variation (μm) in the surface thickness of the sample is measured over a measurement distance of 3 cm. At that time, create a chart with the measured distance (traveling distance of the probe) on the horizontal axis and the measured surface thickness on the vertical axis, and then calculate the average value of the surface thickness to determine the surface thickness at each measurement point. and its average value. The absolute value of this difference was integrated by the measured distance on the horizontal axis (calculate the area of the part surrounded by the surface thickness line and the straight line of its average value on the chart), and then this integrated value was divided by the measured distance. The value is surface roughness (SMD). Note that three samples cut out from book paper were measured at three arbitrary locations, and the arithmetic average value of the obtained measurement results (n=9) was defined as the surface roughness (SMD). Details of the measurement method are also described in known documents, such as Tomori Kondo, "Measurement of basic mechanical properties of paper and measurement of its texture," Journal of the Functional Paper Research Association, No. 28, p62-79 (1989), etc. has been done.
When measuring in the lateral direction (direction perpendicular to the direction of paper machine movement, hereinafter also referred to as the "CD direction"), similarly set the sample in the surface tester so that it is parallel to the CD direction, and Measure the variation in surface thickness with a horizontal transition parallel to the direction.
In addition, the surface roughness (CD-F-SMD) of the front surface (F surface) in the CD direction and the surface roughness (CD-W-SMD) of the back surface (W surface) in the CD direction were measured, and the geometric average value of these was measured. By determining the surface roughness in the lateral direction (CD-SMD). In the present invention, "average SMD" is the geometric mean value of the surface roughness in the longitudinal direction (MD-SMD) and the surface roughness in the lateral direction (CD-SMD).
本発明において、表裏面のＳＭＤの差は、０．０７０μｍ以下である。
表面のＳＭＤ（Ｆ－ＳＭＤ）は、上述した表面（Ｆ面）の縦方向（ＭＤ方向）における表面粗さ（ＭＤ－Ｆ－ＳＭＤ）と、表面（Ｆ面）の横方向（ＣＤ方向）における表面粗さ（ＣＤ－Ｆ－ＳＭＤ）との相乗平均値とする。
同様に、裏面のＳＭＤ（Ｗ－ＳＭＤ）は、上述した裏面（Ｗ面）の縦方向（ＭＤ方向）における表面粗さ（ＭＤ－Ｗ－ＳＭＤ）と、裏面（Ｗ面）の横方向（ＣＤ方向）における表面粗さ（ＣＤ－Ｗ－ＳＭＤ）との相乗平均値とする。
表裏面のＳＭＤの差は、表面のＳＭＤ（Ｆ－ＳＭＤ）と裏面のＳＭＤ（Ｗ－ＳＭＤ）との差の絶対値である。
表裏面のＳＭＤの差は、表裏面ともに手触り感に優れる書籍用紙とする観点から、好ましくは０．０６８μｍ以下、より好ましくは０．０４５μｍ以下、さらに好ましくは０．０３０μｍ以下である。下限は特に限定されない。
In the present invention, the difference in SMD between the front and back surfaces is 0.070 μm or less.
The SMD of the surface (F-SMD) is the surface roughness (MD-F-SMD) in the longitudinal direction (MD direction) of the surface (F-plane) mentioned above, and the surface roughness (MD-F-SMD) in the lateral direction (CD direction) of the surface (F-plane). It is taken as the geometric mean value with the surface roughness (CD-F-SMD).
Similarly, the SMD (W-SMD) of the back surface is determined by the surface roughness (MD-W-SMD) in the longitudinal direction (MD direction) of the back surface (W surface) mentioned above and the lateral direction (CD It is the geometric mean value of surface roughness (CD-W-SMD) in direction).
The difference in SMD between the front and back surfaces is the absolute value of the difference between the SMD on the front surface (F-SMD) and the SMD on the back surface (W-SMD).
The difference in SMD between the front and back surfaces is preferably 0.068 μm or less, more preferably 0.045 μm or less, and even more preferably 0.030 μm or less, from the viewpoint of producing a book paper with excellent texture on both the front and back surfaces. The lower limit is not particularly limited.
＜構成パルプの特性＞
（長さ加重平均繊維長）
本発明の書籍用紙を構成するパルプ成分の長さ加重平均繊維長は、手触り感の観点から、０．９０ｍｍ以下である。書籍用紙を構成するパルプ成分の長さ加重平均繊維長は、０．９０ｍｍ以下であり、好ましくは０．８５ｍｍ以下、さらに好ましくは０．８０ｍｍ以下であり、そして、紙質強度を高める観点から、好ましくは０．６０ｍｍ以上、より好ましくは０．６５ｍｍ以上、さらに好ましくは０．７０ｍｍ以上である。
構成するパルプ成分の長さ加重平均繊維長は、書籍用紙を離解して測定する。具体的には、実施例に記載の方法により測定される。
<Characteristics of constituent pulp>
(Length weighted average fiber length)
The length-weighted average fiber length of the pulp component constituting the book paper of the present invention is 0.90 mm or less from the viewpoint of texture. The length-weighted average fiber length of the pulp component constituting the book paper is 0.90 mm or less, preferably 0.85 mm or less, more preferably 0.80 mm or less, and from the viewpoint of increasing paper strength, preferably is 0.60 mm or more, more preferably 0.65 mm or more, even more preferably 0.70 mm or more.
The length-weighted average fiber length of the constituent pulp components is measured by disintegrating the book paper. Specifically, it is measured by the method described in Examples.
（平均繊維幅）
本発明の書籍用紙を構成するパルプ成分の平均繊維幅は、手触り感の観点から、好ましくは１５．０μｍ以下、より好ましくは１４．５μｍ以下、さらに好ましくは１４．２μｍ以下、よりさらに好ましくは１３．９μｍ以下であり、そして、紙質強度の観点から、好ましくは１２．０μｍ以上、より好ましくは１２．５μｍ以上、さらに好ましくは１３．０μｍ以上、よりさらに好ましくは１３．５μｍ以上である。
構成するパルプの平均繊維幅は、書籍用紙を離解して測定する。具体的には、実施例に記載の方法により測定される。
(Average fiber width)
The average fiber width of the pulp component constituting the book paper of the present invention is preferably 15.0 μm or less, more preferably 14.5 μm or less, still more preferably 14.2 μm or less, even more preferably 13 μm or less, from the viewpoint of texture. .9 μm or less, and from the viewpoint of paper strength, preferably 12.0 μm or more, more preferably 12.5 μm or more, still more preferably 13.0 μm or more, even more preferably 13.5 μm or more.
The average fiber width of the constituent pulp is measured by disintegrating the book paper. Specifically, it is measured by the method described in Examples.
（ルンケル比）
本発明の書籍用紙を構成するパルプ成分のルンケル比は、手触り感および紙質強度の観点から、好ましくは０．９以下、より好ましくは０．８以下、さらに好ましくは０．７以下であり、そして、手触り感の観点から、好ましくは０．４以上、より好ましくは０．５以上、さらに好ましくは０．６以上である。
(Runkel ratio)
The Runkel ratio of the pulp components constituting the book paper of the present invention is preferably 0.9 or less, more preferably 0.8 or less, still more preferably 0.7 or less, from the viewpoint of texture and paper strength, and , from the viewpoint of feel to the touch, preferably 0.4 or more, more preferably 0.5 or more, still more preferably 0.6 or more.
＜書籍用紙の特性＞
本発明の書籍用紙の坪量は、手触り感および紙質強度の観点から、５０ｇ／ｍ２以上９０ｇ／ｍ２以下である。書籍用紙の坪量は、好ましくは５５ｇ／ｍ２以上、より好ましくは６０ｇ／ｍ２以上、さらに好ましくは６３ｇ／ｍ２以上であり、そして、好ましくは８６ｇ／ｍ２以下、より好ましくは８２ｇ／ｍ２以下である。
書籍用紙の坪量は、ＪＩＳ Ｐ ８１２４：２０１１に準拠して測定される。
<Characteristics of book paper>
The basis weight of the book paper of the present invention is 50 g/m 2 or more and 90 g/m 2 or less from the viewpoint of feel and paper strength. The basis weight of the book paper is preferably 55 g/m 2 or more, more preferably 60 g/m 2 or more, even more preferably 63 g/m 2 or more, and preferably 86 g/m 2 or less, more preferably 82 g/m 2 or more. m2 or less.
The basis weight of book paper is measured in accordance with JIS P 8124:2011.
本発明の書籍用紙の紙厚は、手触り感および紙質強度の観点から、好ましくは６０μｍ以上、より好ましくは７０μｍ以上、さらに好ましくは８０μｍ以上であり、そして、好ましくは１５０μｍ以下、より好ましくは１２０μｍ以下、さらに好ましくは１１０μｍ以下である。
書籍用紙の厚みは、ＪＩＳ Ｐ ８１１８：２０１４に準拠して測定される。
The paper thickness of the book paper of the present invention is preferably 60 μm or more, more preferably 70 μm or more, even more preferably 80 μm or more, and preferably 150 μm or less, more preferably 120 μm or less, from the viewpoint of feel and paper strength. , more preferably 110 μm or less.
The thickness of book paper is measured in accordance with JIS P 8118:2014.
また、本発明の書籍用紙の密度は、手触り感および紙質強度の観点から、好ましくは０．６５０ｇ／ｃｍ３以上であり、より好ましくは０．７００ｇ／ｃｍ３以上、さらに好ましくは０．７５０ｇ／ｃｍ３以上であり、そして、好ましくは１．０００ｇ／ｃｍ３以下、より好ましくは０．９００ｇ／ｃｍ３以下、さらに好ましくは０．８５０ｇ／ｃｍ３以下である。 In addition, the density of the book paper of the present invention is preferably 0.650 g/cm 3 or more, more preferably 0.700 g/cm 3 or more, and even more preferably 0.750 g/cm 3 or more from the viewpoint of texture and paper strength. cm 3 or more, and preferably 1.000 g/cm 3 or less, more preferably 0.900 g/cm 3 or less, even more preferably 0.850 g/cm 3 or less.
本発明の書籍用紙は、紙質強度の観点から、縦横平均の比引張強さが、好ましくは４０．０Ｎ・ｍ／ｇ以上、より好ましくは４１．５Ｎ・ｍ／ｇ以上、さらに好ましくは４３．０Ｎ・ｍ／ｇ以上であり、そして、製造容易性および手触り感の観点から、好ましくは８０．０Ｎ・ｍ／ｇ以下、より好ましくは７０．０Ｎ・ｍ／ｇ以下、さらに好ましくは６０．０Ｎ・ｍ／ｇ以下である。
比引張強さは、縦方向および横方向のそれぞれについてＪＩＳ Ｐ ８１１３：２００６に準拠して測定し、縦方向の比引張強さと横方向の比引張強さの相乗平均を縦横平均の比引張強さとする。
From the viewpoint of paper strength, the book paper of the present invention has a vertical and horizontal average specific tensile strength of preferably 40.0 N.m/g or more, more preferably 41.5 N.m/g or more, and still more preferably 43.0 N.m/g or more. 0 N·m/g or more, and from the viewpoint of ease of manufacture and feel to the touch, preferably 80.0 N·m/g or less, more preferably 70.0 N·m/g or less, even more preferably 60.0 N・It is below m/g.
The specific tensile strength is measured in accordance with JIS P 8113:2006 in the longitudinal and transverse directions, and the geometric average of the longitudinal and transverse specific tensile strengths is calculated as the longitudinal and transverse average specific tensile strength. Satoru.
本発明の書籍用紙は、単層であることが好ましい。すなわち、単層抄きの紙であり、かつ、塗工層を有しないことが好ましい。
上記の態様とすることにより、表裏の表面粗さの差を少なくすることができ、表裏ともに手触り感に優れる書籍用紙を得ることができるため、好ましい。
さらに塗工層を有しないことにより、製造容易であり、経済性に優れる観点からも好ましい。
It is preferable that the book paper of the present invention has a single layer. That is, it is preferable that the paper is single-layer paper and does not have a coating layer.
The above embodiment is preferable because it is possible to reduce the difference in surface roughness between the front and back sides, and it is possible to obtain book paper that is excellent in feel to the touch on both the front and back sides.
Furthermore, since it does not have a coating layer, it is easy to manufacture and is preferable from the viewpoint of being economically efficient.
＜書籍用紙の原料＞
（原料パルプ）
書籍用紙の原料パルプとしては、たとえば、木材パルプ、非木材パルプ、および脱墨パルプが挙げられる。木材パルプとしては、特に限定されないが、たとえば、広葉樹クラフトパルプ（ＬＫＰ）、針葉樹クラフトパルプ（ＮＫＰ）、サルファイトパルプ（ＳＰ）、溶解パルプ（ＤＰ）、ソーダパルプ（ＡＰ）、晒しクラフトパルプ（ＢＫＰ）、未晒しクラフトパルプ（ＵＫＰ）、酸素漂白クラフトパルプ（ＯＫＰ）等の化学パルプ、セミケミカルパルプ（ＳＣＰ）、ケミグラウンドウッドパルプ（ＣＧＰ）等の半化学パルプ、砕木パルプ（ＧＰ）、サーモメカニカルパルプ（ＴＭＰ）、ケミサーモメカニカルパルプ（ＣＴＭＰ）等の機械パルプ等が挙げられる。非木材パルプとしては、特に限定されないが、たとえば、コットンリンター、コットンリント等の綿系パルプ、麻、麦わら、バガス等の非木材系パルプが挙げられる。脱墨パルプとしては、特に限定されないが、たとえば、古紙を原料とする脱墨パルプが挙げられる。原料パルプは、上記の１種を単独でも２種以上混合して用いてもよい。なお、原料パルプに、ポリアミド繊維、ポリエステル繊維等の有機合成繊維、ポリノジック繊維等の再生繊維、ガラス繊維、セラミック繊維、カーボン繊維等の無機繊維を混用してもよく、好ましくは、ポリアミド繊維、ポリエステル繊維等の有機合成繊維、ポリノジック繊維等の再生繊維を混用することである。
<Raw materials for book paper>
(Raw material pulp)
Examples of the raw material pulp for book paper include wood pulp, non-wood pulp, and deinked pulp. Examples of wood pulp include, but are not limited to, hardwood kraft pulp (LKP), softwood kraft pulp (NKP), sulfite pulp (SP), dissolving pulp (DP), soda pulp (AP), and bleached kraft pulp (BKP). ), chemical pulp such as unbleached kraft pulp (UKP), oxygen bleached kraft pulp (OKP), semi-chemical pulp such as semi-chemical pulp (SCP), chemical ground wood pulp (CGP), ground wood pulp (GP), thermomechanical pulp Examples include mechanical pulp such as pulp (TMP) and chemi-thermomechanical pulp (CTMP). Examples of the non-wood pulp include, but are not particularly limited to, cotton-based pulps such as cotton linters and cotton lint, and non-wood-based pulps such as hemp, wheat straw, and bagasse. Deinked pulp is not particularly limited, but includes, for example, deinked pulp made from waste paper. The raw material pulp may be used alone or in combination of two or more of the above. Note that the raw material pulp may be mixed with organic synthetic fibers such as polyamide fibers and polyester fibers, recycled fibers such as polynosic fibers, and inorganic fibers such as glass fibers, ceramic fibers, and carbon fibers, and preferably polyamide fibers and polyester fibers. This means mixing organic synthetic fibers such as fibers, and recycled fibers such as polynosic fibers.
これらの中でも、原料パルプとしては、広葉樹クラフトパルプ（ＬＫＰ）、針葉樹クラフトパルプ（ＮＫＰ）が好ましく、広葉樹クラフトパルプがより好ましい。原料パルプが、広葉樹クラフトパルプのみであるか、広葉樹クラフトパルプと針葉樹クラフトパルプとを併用することがさらに好ましい。
また、広葉樹クラフトパルプ（ＬＫＰ）としては、広葉樹晒クラフトパルプ（ＬＢＫＰ）が好ましく、針葉樹クラフトパルプ（ＮＫＰ）としては、針葉樹晒クラフトパルプ（ＮＢＫＰ）が好ましい。
Among these, the raw material pulp is preferably hardwood kraft pulp (LKP) or softwood kraft pulp (NKP), and more preferably hardwood kraft pulp. It is more preferable that the raw material pulp is only hardwood kraft pulp or a combination of hardwood kraft pulp and softwood kraft pulp.
In addition, as the hardwood kraft pulp (LKP), hardwood bleached kraft pulp (LBKP) is preferable, and as the softwood kraft pulp (NKP), softwood bleached kraft pulp (NBKP) is preferable.
また、本発明の書籍用紙の原料パルプのカナダ標準ろ水度（ＣＳＦ）は、手触り感および紙質強度の観点から、好ましくは３００ｍＬ以上、より好ましくは３５０ｍＬ以上、さらに好ましくは３８０ｍＬ以上であり、そして、好ましくは６００ｍＬ以下、より好ましくは５００ｍＬ以下、さらに好ましくは４５０ｍＬ以下、よりさらに好ましくは４２０ｍＬ以下である。
カナダ標準ろ水度が上記範囲内となるように、叩解の程度を調整すればよい。
原料パルプのカナダ標準ろ水度（ＣＳＦ）は、ＪＩＳ Ｐ ８１２１－２：２０１２に準拠して測定される。
In addition, the Canadian standard freeness (CSF) of the raw material pulp for the book paper of the present invention is preferably 300 mL or more, more preferably 350 mL or more, and even more preferably 380 mL or more, from the viewpoint of texture and paper strength. , preferably 600 mL or less, more preferably 500 mL or less, still more preferably 450 mL or less, even more preferably 420 mL or less.
The degree of beating may be adjusted so that the Canadian standard freeness is within the above range.
The Canadian Standard Freeness (CSF) of the raw pulp is measured in accordance with JIS P 8121-2:2012.
（任意成分）
原料パルプには、必要に応じて、たとえば、サイズ剤、アニオン性、カチオン性もしくは両性の歩留向上剤、濾水性向上剤、乾燥紙力増強剤、湿潤紙力増強剤、填料等の内添助剤、耐水化剤、染料、蛍光増白剤等の任意成分を添加してもよい。
サイズ剤としては、ロジンサイズ剤、アルキルケテンダイマー（ＡＫＤ）、アルケニル無水コハク酸（ＡＳＡ）等の内添サイズ剤；スチレン／アクリル酸共重合体、スチレン／メタクリル酸共重合体等の表面サイズ剤が挙げられる。
歩留向上剤としては、硫酸バンド、ポリアクリルアミド等が挙げられる。歩留向上剤は、原料パルプに添加されることが好ましい。
乾燥紙力増強剤としては、カチオン化澱粉、ポリアクリルアミド、カルボキシメチルセルロース等が挙げられる。
湿潤紙力増強剤としては、ポリアミドポリアミンエピクロロヒドリン（ＰＡＥ）、尿素ホルムアルデヒド樹脂、メラミンホルムアルデヒド樹脂等が挙げられる。湿潤紙力増強剤は、紙基材全層の原料パルプに添加されることが好ましい。
填料としては、クレー、タルク、カオリン、焼成カオリン、炭酸カルシウム、硫酸カルシウム、硫酸バリウム、二酸化チタン、酸化亜鉛、アルミナ、炭酸マグネシウム、酸化マグネシウム、シリカ、ホワイトカーボン、ベントナイト、ゼオライト、セリサイト、スメクタイト等の無機填料；アクリル系樹脂、塩化ビニリデン系樹脂等の有機填料が挙げられる。
(optional ingredient)
If necessary, internal additions such as sizing agents, anionic, cationic or amphoteric retention aids, freeness improvers, dry paper strength enhancers, wet paper strength enhancers, and fillers may be added to the raw pulp. Optional components such as auxiliary agents, waterproofing agents, dyes, and optical brighteners may be added.
Examples of sizing agents include internal sizing agents such as rosin sizing agents, alkyl ketene dimer (AKD), and alkenyl succinic anhydride (ASA); surface sizing agents such as styrene/acrylic acid copolymers and styrene/methacrylic acid copolymers. can be mentioned.
Examples of retention aids include sulfuric acid, polyacrylamide, and the like. The retention aid is preferably added to the raw pulp.
Examples of the dry paper strength enhancer include cationized starch, polyacrylamide, carboxymethyl cellulose, and the like.
Examples of wet paper strength agents include polyamide polyamine epichlorohydrin (PAE), urea formaldehyde resin, melamine formaldehyde resin, and the like. The wet paper strength agent is preferably added to the raw pulp of all layers of the paper base material.
Fillers include clay, talc, kaolin, calcined kaolin, calcium carbonate, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, alumina, magnesium carbonate, magnesium oxide, silica, white carbon, bentonite, zeolite, sericite, smectite, etc. Inorganic fillers include organic fillers such as acrylic resins and vinylidene chloride resins.
サイズ剤の配合量は、特に限定されないが、製造時の操業性に優れる観点から、原料パルプ１００質量部（固形分換算）に対して、好ましくは２．５質量部以下、より好ましくは１．０質量部以下、さらに好ましくは０．５質量部以下であり、その下限は０質量％である。 The amount of the sizing agent is not particularly limited, but from the viewpoint of excellent operability during production, it is preferably 2.5 parts by mass or less, more preferably 1. It is 0 parts by mass or less, more preferably 0.5 parts by mass or less, and the lower limit is 0% by mass.
歩留向上剤の配合量は、特に限定されないが、原料パルプ１００質量部（固形分換算）に対して、好ましくは３．０質量部以下、より好ましくは２．０質量部以下である。 The blending amount of the retention aid is not particularly limited, but is preferably 3.0 parts by mass or less, more preferably 2.0 parts by mass or less, based on 100 parts by mass (solid content equivalent) of the raw material pulp.
乾燥紙力増強剤の配合量は、特に限定されないが、原料パルプ１００質量部（固形分換算）に対して、好ましくは２．５質量部以下、より好ましくは２．０質量部以下であり、その下限は０質量％である。
また、湿潤紙力増強剤の配合量は、特に限定されないが、原料パルプ１００質量部（固形分換算）に対して、好ましくは１．０質量部以下、より好ましくは０．７質量部以下である。
The amount of the dry paper strength enhancer is not particularly limited, but is preferably 2.5 parts by mass or less, more preferably 2.0 parts by mass or less, based on 100 parts by mass of the raw material pulp (solid content equivalent). The lower limit is 0% by mass.
The amount of the wet paper strength enhancer is not particularly limited, but is preferably 1.0 parts by mass or less, more preferably 0.7 parts by mass or less, based on 100 parts by mass of the raw material pulp (in terms of solid content). be.
本発明の書籍用紙は、嵩高剤の含有量が少ないことが、紙質強度の観点から好ましい。書籍用紙の固形分中の嵩高剤の配合量は、好ましくは０．１質量％以下、より好ましくは０．０１質量％以下、さらに好ましくは含有しないことである。 In the book paper of the present invention, it is preferable that the content of the bulking agent is small from the viewpoint of paper strength. The amount of the bulking agent in the solid content of the book paper is preferably 0.1% by mass or less, more preferably 0.01% by mass or less, and still more preferably not contained.
本発明の書籍用紙は、填料として、予め両性ポリマーにより処理した炭酸カルシウムを含有することが好ましい。炭酸カルシウムを予め両性ポリマーにより処理することにより、炭酸カルシウムが凝集し、パルプ繊維同士の絡み合いの阻害が抑制され、その結果、紙質強度に優れた書籍用紙が得られる。
炭酸カルシウムは、重質炭酸カルシウム（粉砕炭酸カルシウム）、軽質炭酸カルシウム（沈降炭酸カルシウム）のいずれも用いることができる。また、クレー、タルク、シリカ、アルミノケイ酸塩、酸化チタン、酸化亜鉛、ホワイトカーボン、水酸化アルミ、ゼオライト等の炭酸カルシウム以外の填料や、有機填料を併用してもよい。
処理前の炭酸カルシウムの５０％体積平均粒子径は、好ましくは１０μｍ以下である。
The book paper of the present invention preferably contains calcium carbonate that has been treated with an amphoteric polymer in advance as a filler. By pre-treating calcium carbonate with an amphoteric polymer, the calcium carbonate aggregates, inhibiting the entanglement of pulp fibers with each other, and as a result, book paper with excellent paper strength can be obtained.
As calcium carbonate, either heavy calcium carbonate (ground calcium carbonate) or light calcium carbonate (precipitated calcium carbonate) can be used. In addition, fillers other than calcium carbonate, such as clay, talc, silica, aluminosilicate, titanium oxide, zinc oxide, white carbon, aluminum hydroxide, zeolite, and organic fillers may be used in combination.
The 50% volume average particle diameter of calcium carbonate before treatment is preferably 10 μm or less.
炭酸カルシウムを処理する両性ポリマーとしては、アクリルアミド系共重合体が好ましく、非イオン性モノマーと、カチオン性モノマーと、アニオン性モノマーとの共重合体が好ましい。
非イオン性モノマーとしては、アクリルアミド、メタクリルアミド、ジメチルアクリルアミド、メチレンビスアクリルアミドが挙げられる。
カチオン性モノマーとしては、３級アミノ基、または４級アンモニウム塩類を有するビニルモノマーが挙げられる。３級アミノ基を有するビニルモノマーとしては、たとえばジメチルアミノエチル（メタ）アクリレート、ジエチルアミノエチル（メタ）アクリレート、ジメチルアミノプロピル（メタ）アクリレート、およびジエチルアミノプロピル（メタ）アクリレート等のジアルキルアミノアルキル（メタ）アクリレート類、ジメチルアミノプロピル（メタ）アクリルアミド、およびジエチルアミノプロピル（メタ）アクリルアミド等のジアルキルアミノアルキル（メタ）アクリルアミド類、前記３級アミノ基を有するビニルモノマーの塩酸塩、および硫酸塩等の無機酸塩類、並びに前記３級アミノ基を有するビニルモノマーのギ酸塩、および酢酸塩等の有機酸塩類が挙げられる
４級アンモニウム塩類を有するビニルモノマーとしては、前記３級アミノ基を有するビニルモノマーと４級化剤との反応によって得られるビニルモノマーが挙げられる。前記４級化剤としては、メチルクロライド、およびメチルブロマイド等のアルキルハライド、ベンジルクロライド、およびベンジルブロマイド等のアラルキルハライド、ジメチル硫酸、ジエチル硫酸、エピクロロヒドリン、３－クロロ－２－ヒドロキシプロピルトリメチルアンモニウムクロライド、並びにグリシジルトリアルキルアンモニウムクロライド等が挙げられる。これらの３級アミノ基、または４級アンモニウム塩類を有するビニルモノマーは１種単独で用いてもよいし、２種以上を併用してもよい。
As the amphoteric polymer for treating calcium carbonate, an acrylamide copolymer is preferable, and a copolymer of a nonionic monomer, a cationic monomer, and an anionic monomer is preferable.
Nonionic monomers include acrylamide, methacrylamide, dimethylacrylamide, and methylenebisacrylamide.
Examples of the cationic monomer include vinyl monomers having a tertiary amino group or quaternary ammonium salts. Examples of the vinyl monomer having a tertiary amino group include dialkylaminoalkyl (meth)acrylate such as dimethylaminoethyl (meth)acrylate, diethylaminoethyl (meth)acrylate, dimethylaminopropyl (meth)acrylate, and diethylaminopropyl (meth)acrylate. Acrylates, dialkylaminoalkyl (meth)acrylamides such as dimethylaminopropyl (meth)acrylamide and diethylaminopropyl (meth)acrylamide, hydrochlorides of vinyl monomers having a tertiary amino group, and inorganic acid salts such as sulfates. , and organic acid salts such as formates and acetates of vinyl monomers having a tertiary amino group. Examples of vinyl monomers having quaternary ammonium salts include quaternized vinyl monomers having a tertiary amino group and organic acid salts such as acetates. Examples include vinyl monomers obtained by reaction with agents. Examples of the quaternizing agent include alkyl halides such as methyl chloride and methyl bromide, aralkyl halides such as benzyl chloride and benzyl bromide, dimethyl sulfate, diethyl sulfate, epichlorohydrin, and 3-chloro-2-hydroxypropyltrimethyl. Examples include ammonium chloride and glycidyl trialkylammonium chloride. These vinyl monomers having a tertiary amino group or a quaternary ammonium salt may be used alone or in combination of two or more.
アニオン性モノマーとしては、不飽和モノカルボン酸、不飽和ジカルボン酸、不飽和トリカルボン酸、不飽和テトラカルボン酸、不飽和スルホン酸、不飽和ホスホン酸およびそれらの塩類等が挙げられ、これらの１種を単独でまたは２種以上を併用して使用することができる。
不飽和モノカルボン酸およびそれらの塩類としては、アクリル酸、メタクリル酸、２－アクリルアミド－Ｎ－グリコール酸、およびそれらのナトリウム、カリウム塩等のアルカリ金属類またはアンモニウム塩等が挙げられる。
不飽和ジカルボン酸およびそれらの塩類の例としては、マレイン酸、フマル酸、イタコン酸、シトラコン酸およびそれらのナトリウム、カリウム塩等のアルカリ金属塩類またはアンモニウム塩等が挙げられる。
不飽和トリカルボン酸およびそれらの塩類の例としてはアコニット酸、３－ブテン－１，２，３－トリカルボン酸、４－ペンテン－１，２，４－トリカルボン酸およびそれらのナトリウム、カリウム塩等のアルカリ金属塩類またはアンモニウム塩等が挙げられる。
不飽和テトラカルボン酸およびそれらの塩類の例としては、１－ペンテン－１，１，４，４－テトラカルボン酸、４－ペンテン－１，２，３，４－テトラカルボン酸、３－ヘキセン－１，１，６，６－テトラカルボン酸およびそれらのナトリウム、カリウム塩等のアルカリ金属塩類またはアンモニウム塩等が挙げられる。
不飽和スルホン酸の例としては、ビニルスルホン酸、スチレンスルホン酸、（メタ）アリルスルホン酸、２－アクリルアミド－２－メチルプロパンスルホン酸およびそれらのナトリウム、カリウム等のアルカリ金属塩またはアンモニウム塩等が挙げられる。
不飽和ホスホン酸の例としては、ビニルホスホン酸、α－フェニルビニルホスホン酸およびそれらのナトリウム、カリウム塩等のアルカリ金属塩類またはアンモニウム塩等が挙げられる。
上記のアニオン性ビニルモノマーの中でも紙質強度および経済性の点で不飽和モノカルボン酸、不飽和ジカルボン酸、具体的には、アクリル酸、イタコン酸、２－アクリルアミド－Ｎ－グリコール酸、およびその塩類が特に好ましい。
Examples of anionic monomers include unsaturated monocarboxylic acids, unsaturated dicarboxylic acids, unsaturated tricarboxylic acids, unsaturated tetracarboxylic acids, unsaturated sulfonic acids, unsaturated phosphonic acids, and salts thereof, and one type of these monomers These can be used alone or in combination of two or more.
Examples of unsaturated monocarboxylic acids and their salts include acrylic acid, methacrylic acid, 2-acrylamido-N-glycolic acid, and alkali metal salts or ammonium salts thereof such as sodium and potassium salts.
Examples of unsaturated dicarboxylic acids and their salts include maleic acid, fumaric acid, itaconic acid, citraconic acid, and their alkali metal salts such as sodium and potassium salts or ammonium salts.
Examples of unsaturated tricarboxylic acids and their salts include aconitic acid, 3-butene-1,2,3-tricarboxylic acid, 4-pentene-1,2,4-tricarboxylic acid, and alkalis such as their sodium and potassium salts. Examples include metal salts and ammonium salts.
Examples of unsaturated tetracarboxylic acids and their salts include 1-pentene-1,1,4,4-tetracarboxylic acid, 4-pentene-1,2,3,4-tetracarboxylic acid, 3-hexene- Examples include 1,1,6,6-tetracarboxylic acid and its alkali metal salts such as sodium and potassium salts, or ammonium salts.
Examples of unsaturated sulfonic acids include vinylsulfonic acid, styrenesulfonic acid, (meth)allylsulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid, and their alkali metal salts such as sodium and potassium salts or ammonium salts. Can be mentioned.
Examples of unsaturated phosphonic acids include vinylphosphonic acid, α-phenylvinylphosphonic acid, and their alkali metal salts such as sodium and potassium salts or ammonium salts.
Among the above anionic vinyl monomers, unsaturated monocarboxylic acids and unsaturated dicarboxylic acids, specifically acrylic acid, itaconic acid, 2-acrylamido-N-glycolic acid, and their salts, are preferred from the viewpoint of paper strength and economic efficiency. is particularly preferred.
両性ポリマーは、イオン性モノマー（カチオン性モノマーとアニオン性モノマーとの合計量）と、非イオン性モノマーとのモル比が、好ましくは５／９５以上４０／６０以下、より好ましくは１０／９０以上２５／７５以下である。
また、同様の観点から、（カチオン性モノマーのモル数×カチオン性モノマー１分子中のカチオン性基の数）／（アニオン性モノマーのモル数×アニオン性モノマー１分子中のアニオン性基の数）の比は、好ましくは５０／５０以上９０／１０以下、より好ましくは５０／５０以上８０／２０以下である。
In the amphoteric polymer, the molar ratio of ionic monomer (total amount of cationic monomer and anionic monomer) to nonionic monomer is preferably 5/95 or more and 40/60 or less, more preferably 10/90 or more. 25/75 or less.
From the same point of view, (number of moles of cationic monomer x number of cationic groups in one molecule of cationic monomer)/(number of moles of anionic monomer x number of anionic groups in one molecule of anionic monomer) The ratio is preferably 50/50 or more and 90/10 or less, more preferably 50/50 or more and 80/20 or less.
両性ポリマーの重量平均分子量は、紙質強度の観点から、好ましくは２００万以上、より好ましくは２５０万以上であり、そして、好ましくは７００万以下、より好ましくは５００万以下である。両性ポリマーの重量平均分子量は、ＧＰＣ－ＭＡＬＳ法により測定される。 From the viewpoint of paper strength, the weight average molecular weight of the amphoteric polymer is preferably 2 million or more, more preferably 2.5 million or more, and preferably 7 million or less, more preferably 5 million or less. The weight average molecular weight of the amphoteric polymer is measured by GPC-MALS method.
炭酸カルシウム１００質量部に対する両性ポリマーの処理量は、好ましくは０．１質量部以上、より好ましくは０．２質量部以上、さらに好ましくは０．４質量部以上であり、そして、好ましくは５質量部以下、より好ましくは３質量部以下、さらに好ましくは１質量部以下である。 The amount of amphoteric polymer treated with respect to 100 parts by mass of calcium carbonate is preferably 0.1 parts by mass or more, more preferably 0.2 parts by mass or more, still more preferably 0.4 parts by mass or more, and preferably 5 parts by mass. parts, more preferably 3 parts by weight or less, still more preferably 1 part by weight or less.
炭酸カルシウムと両性ポリマーとを混合する方法として特に限定されないが、水を溶媒とした炭酸カルシウムのスラリーと、両性ポリマーの水溶液とを混合する方法が簡便である。混合方法については、均一に混合可能な公知の方法および装置が採用される。なお、剪断力が強すぎる場合には、未凝集の粒子が増加する傾向があるので、適宜調整することが好ましい。 Although the method for mixing calcium carbonate and the amphoteric polymer is not particularly limited, a simple method is to mix a slurry of calcium carbonate using water as a solvent and an aqueous solution of the amphoteric polymer. As for the mixing method, known methods and devices that can mix uniformly are employed. Note that if the shearing force is too strong, the number of unagglomerated particles tends to increase, so it is preferable to adjust it appropriately.
＜書籍用紙の製造方法＞
本発明の書籍用紙は、原料パルプを含有するパルプスラリーを抄紙および脱水する抄紙工程と、得られた湿紙を乾燥する乾燥工程とを含む方法により得られる。抄紙方法は、特に限定されず、たとえば、ｐＨが４．５付近で抄紙を行う酸性抄紙法、ｐＨが約６～約９で抄紙を行う中性抄紙法等が挙げられる。抄紙機についても、特に限定されず、たとえば、長網式、ツインワイヤー式、円網式、傾斜式等の連続抄紙機、またはこれらを組み合わせた多層抄き合わせ抄紙機等が挙げられる。
<Manufacturing method of book paper>
The book paper of the present invention can be obtained by a method including a paper-making process in which a pulp slurry containing raw material pulp is made into paper and dehydrated, and a drying process in which the obtained wet paper is dried. The paper-making method is not particularly limited, and includes, for example, an acid paper-making method in which paper is made at a pH of about 4.5, a neutral paper-making method in which paper is made at a pH of about 6 to about 9, and the like. The paper machine is not particularly limited either, and examples thereof include continuous paper machines such as fourdrinier type, twin wire type, cylinder type, and inclined type, and multilayer paper machines combining these.
本発明において、表裏面ともに手触り感に優れる書籍用紙を得る観点から、抄紙工程は、両面脱水型抄紙機で抄紙する工程であることが好ましい。
このような観点から、抄紙機としては、ツインワイヤー式抄紙機が好ましく、特に、ギャップフォーマーおよびオントップフォーマーが好ましい。
また、表裏面ともに手触り感に優れる書籍用紙を得る観点から、多段階で脱水を行うことが好ましく、一次脱水時のプレス線圧は、好ましくは３０ｋＮ／ｍ以上、より好ましくは４０ｋＮ／ｍ以上、さらに好ましくは５０ｋＮ／ｍ以上であり、そして、好ましくは９０ｋＮ／ｍ以下、より好ましくは８０ｋＮ／ｍ以下、さらに好ましくは７０ｋＮ／ｍ以下である。
また、同様の観点から、二次脱水時のプレス線圧は、好ましくは７０ｋＮ／ｍ以上、より好ましくは８０ｋＮ／ｍ以上、さらに好ましくは９０ｋＮ／ｍ以上であり、そして、好ましくは１３０ｋＮ／ｍ以下、より好ましくは１２０ｋＮ／ｍ以下、さらに好ましくは１１０ｋＮ／ｍ以下である。
また、乾燥方法についても、特に限定されず、公知の乾燥装置を用いることができる。
また、乾燥後に、カレンダー処理を行い、所望の平滑度となるように調整することが好ましい。
In the present invention, from the viewpoint of obtaining book paper that is excellent in feel to the touch on both the front and back sides, the paper making process is preferably a process in which paper is made using a double-sided dehydration type paper machine.
From this point of view, the paper machine is preferably a twin-wire paper machine, with gap formers and on-top formers being particularly preferred.
In addition, from the viewpoint of obtaining book paper that has excellent texture on both the front and back sides, it is preferable to perform dehydration in multiple stages, and the press linear pressure during the primary dehydration is preferably 30 kN/m or more, more preferably 40 kN/m or more, More preferably, it is 50 kN/m or more, and preferably 90 kN/m or less, more preferably 80 kN/m or less, and still more preferably 70 kN/m or less.
Further, from the same viewpoint, the press linear pressure during secondary dehydration is preferably 70 kN/m or more, more preferably 80 kN/m or more, even more preferably 90 kN/m or more, and preferably 130 kN/m or less. , more preferably 120 kN/m or less, still more preferably 110 kN/m or less.
Furthermore, the drying method is not particularly limited, and any known drying device can be used.
Further, after drying, it is preferable to perform a calender treatment to adjust the desired smoothness.
また、抄紙工程中に、品質を損なわない範囲で下記の添加剤を含浸させてもよい。
添加剤としては、ＰＶＡ、デンプン、バインダー、顔料、分散剤、増粘剤、保水剤、消泡剤、着色剤等が挙げられる。
Further, during the papermaking process, the following additives may be impregnated within a range that does not impair quality.
Examples of additives include PVA, starch, binder, pigment, dispersant, thickener, water retention agent, antifoaming agent, coloring agent, and the like.
以下に実施例と比較例を挙げて本発明の特徴をさらに具体的に説明する。以下の実施例に示す材料、使用量、割合、処理内容、処理手順等は、本発明の趣旨を逸脱しない限り適宜変更することができる。従って、本発明の範囲は以下に示す具体例により限定的に解釈されるべきものではない。以下の説明において、「部」、「％」は、特に断りのない限り、それぞれ「質量部」「質量％」を意味する。 EXAMPLES The features of the present invention will be explained in more detail below with reference to Examples and Comparative Examples. The materials, usage amounts, proportions, processing details, processing procedures, etc. shown in the following examples can be changed as appropriate without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be interpreted as being limited by the specific examples shown below. In the following description, "parts" and "%" mean "parts by mass" and "% by mass", respectively, unless otherwise specified.
＜炭酸カルシウムの事前処理＞
１０質量部の軽質炭酸カルシウムと０．０５質量部の両性ポリマー（アクリルアミド系共重合化合物、粘度：４０００～１００００ｍＰａ・ｓ（１５％、２５℃）、電荷：０．２７ｍｅｑ／ｇ、星光ＰＭＣ株式会社製）を事前混合した。
<Pre-treatment of calcium carbonate>
10 parts by mass of light calcium carbonate and 0.05 parts by mass of amphoteric polymer (acrylamide copolymer compound, viscosity: 4000 to 10000 mPa・s (15%, 25°C), charge: 0.27 meq/g, Seiko PMC Co., Ltd. (manufactured by) were pre-mixed.
＜実施例１＞
原料パルプとして、ＣＳＦ４００ｍＬの広葉樹晒クラフトパルプ（ＬＢＫＰ）を使用した。パルプ１００質量部（絶乾質量）に対して０．５質量部の硫酸バンド（硫酸アルミニウム１８水和物）と、１．２質量部のカチオン化澱粉（ピラースターチ株式会社製、商品名：Ｐ－３Ｙ）を添加した後、０．１４質量部のアルケニル無水コハク酸を添加し、パルプ濃度が０．５質量％になるように希釈し、パルプスラリーを調製した。
上記パルプスラリーに、事前処理した炭酸カルシウムを、パルプ１００質量部（絶乾質量）に対して１０．０５質量部添加した。さらに、パルプ１００質量部（絶乾質量）に対して０．０１質量部の歩留向上剤（ハイモ株式会社製、商品名：ＮＤ－３００）を添加して、抄紙用パルプスラリーを調製した。
上記抄紙用パルプスラリーを、両面脱水型抄紙機にて抄紙することにより、書籍用紙を得た。この時の一次脱水時のプレス線圧を６０ｋＮ／ｍとし、二次脱水時のプレス線圧を１００ｋＮ／ｍとして、脱水を行った。
得られた書籍用紙について、各種測定、評価を行った、結果を表１および２に示す。
<Example 1>
As the raw material pulp, hardwood bleached kraft pulp (LBKP) with a CSF of 400 mL was used. 0.5 parts by mass of sulfuric acid band (aluminum sulfate 18 hydrate) and 1.2 parts by mass of cationized starch (manufactured by Pillar Starch Co., Ltd., product name: P) per 100 parts by mass (absolutely dry mass) of pulp. -3Y), 0.14 parts by mass of alkenyl succinic anhydride was added and diluted to a pulp concentration of 0.5% by mass to prepare a pulp slurry.
To the above pulp slurry, 10.05 parts by mass of pretreated calcium carbonate was added to 100 parts by mass (absolutely dry mass) of the pulp. Furthermore, 0.01 part by mass of a retention aid (trade name: ND-300, manufactured by Heimo Co., Ltd.) was added to 100 parts by mass (absolutely dry mass) of the pulp to prepare a pulp slurry for papermaking.
Book paper was obtained by making paper from the above pulp slurry for paper making using a double-sided dehydrating paper machine. At this time, dewatering was carried out at a press linear pressure of 60 kN/m during the primary dehydration and a press linear pressure of 100 kN/m during the secondary dehydration.
The obtained book paper was subjected to various measurements and evaluations, and the results are shown in Tables 1 and 2.
＜実施例２＞
坪量を表２に記載のように変更した以外は実施例１と同様にして書籍用紙を製造した。
<Example 2>
Book paper was produced in the same manner as in Example 1 except that the basis weight was changed as shown in Table 2.
＜実施例３＞
原料パルプとして、パルプ１００質量部（絶乾質量）に対して広葉樹晒クラフトパルプ（ＬＢＫＰ）を８０質量部と針葉樹クラフパルプ（ＮＢＫＰ）を２０質量部の混合原料ＣＳＦ４００ｍＬを使用した。
パルプ１００質量部（絶乾質量）に対して０．５質量部の硫酸バンド（硫酸アルミニウム１８水和物）と、１．０質量部のカチオン化澱粉（ピラースターチ社製、Ｐ－３Ｙ）を添加した後、０．１０質量部のアルケニル無水コハク酸を添加し、パルプ濃度が０．５質量％になるように希釈し、パルプスラリーを調製した。
上記パルプスラリーに、事前処理した炭酸カルシウムを、パルプ１００質量部（絶乾質量）に対して１０．５質量部添加した。さらに、パルプ１００質量部（絶乾質量）に対して０．０１質量部の歩留向上剤（ハイモ株式会社製、商品名：ＮＤ－３００）を添加して、抄紙用パルプスラリーを調製した。
上記抄紙用パルプスラリーを、両面脱水型抄紙機にて抄紙した。この時の一次脱水時のプレス線圧を６０ｋＮ／ｍとし、二次脱水時のプレス線圧を１００ｋＮ／ｍとして、脱水を行った。
<Example 3>
As the raw material pulp, 400 mL of mixed raw material CSF containing 80 parts by mass of hardwood bleached kraft pulp (LBKP) and 20 parts by mass of softwood kraft pulp (NBKP) per 100 parts by mass (absolutely dry mass) of pulp was used.
0.5 parts by mass of sulfuric acid band (aluminum sulfate 18 hydrate) and 1.0 parts by mass of cationized starch (manufactured by Pillar Starch Co., Ltd., P-3Y) were added to 100 parts by mass (absolutely dry mass) of pulp. After the addition, 0.10 parts by mass of alkenyl succinic anhydride was added and diluted to a pulp concentration of 0.5% by mass to prepare a pulp slurry.
To the above pulp slurry, 10.5 parts by mass of pretreated calcium carbonate was added to 100 parts by mass (absolutely dry mass) of the pulp. Furthermore, 0.01 part by mass of a retention aid (trade name: ND-300, manufactured by Heimo Co., Ltd.) was added to 100 parts by mass (absolutely dry mass) of the pulp to prepare a pulp slurry for papermaking.
The above pulp slurry for paper making was made into paper using a double-sided dehydration type paper machine. At this time, dewatering was carried out at a press linear pressure of 60 kN/m during the primary dehydration and a press linear pressure of 100 kN/m during the secondary dehydration.
＜比較例１＞
原料パルプとして、ＣＳＦ４５０ｍＬの広葉樹晒クラフトパルプ（ＬＢＫＰ）を使用したこと、および片面脱水型抄紙機にて抄紙したこと以外は、実施例１と同様にして書籍用紙を得た。
<Comparative example 1>
Book paper was obtained in the same manner as in Example 1, except that hardwood bleached kraft pulp (LBKP) with 450 mL of CSF was used as the raw material pulp, and the paper was made using a single-sided dehydrating paper machine.
＜比較例２＞
原料パルプとして、ＣＳＦ３７０ｍＬの広葉樹晒クラフトパルプ（ＬＢＫＰ）を使用したこと、および片面脱水型抄紙機にて抄紙したこと以外は、実施例１と同様にして書籍用紙を得た。
<Comparative example 2>
Book paper was obtained in the same manner as in Example 1, except that hardwood bleached kraft pulp (LBKP) with a CSF of 370 mL was used as the raw material pulp, and the paper was made using a single-sided dehydrating paper machine.
＜比較例３＞
パルプ１００質量部（絶乾質量）に対して、嵩高剤（荒川化学工業株式会社製、サイズパイン ＤＬ－ＦＡ２０）を０．４質量部添加し、片面脱水型抄紙機にて抄紙したこと以外は、実施例１と同様にして書籍用紙を得た。
<Comparative example 3>
Except that 0.4 parts by mass of a bulking agent (Sizepine DL-FA20, manufactured by Arakawa Chemical Co., Ltd.) was added to 100 parts by mass (absolutely dry mass) of pulp, and the paper was made using a single-sided dehydration type paper machine. A book paper was obtained in the same manner as in Example 1.
＜比較例４＞
事前処理した炭酸カルシウム１０．５質量部の代わりに、未処理の炭酸カルシウム１０質量部を添加した以外は実施例１と同様にして書籍用紙をえた。
<Comparative example 4>
Book paper was obtained in the same manner as in Example 1, except that 10 parts by mass of untreated calcium carbonate was added instead of 10.5 parts by mass of pretreated calcium carbonate.
[測定および評価]
実施例および比較例で得られた書籍用紙について、以下の評価を行った。
＜坪量、紙厚、および密度＞
書籍用紙の坪量は、ＪＩＳ Ｐ ８１２４：２０１１に準拠して測定した。
また、書籍用紙の厚みは、ＪＩＳ Ｐ ８１１８：２０１４に準拠して測定した。
書籍用紙の密度は、ＪＩＳ Ｐ ８１１８：２０１４に準拠し、上述した方法で測定された書籍用紙の坪量および厚さから算出した。
[Measurement and evaluation]
The book paper obtained in Examples and Comparative Examples was evaluated as follows.
<Basic weight, paper thickness, and density>
The basis weight of the book paper was measured in accordance with JIS P 8124:2011.
Further, the thickness of the book paper was measured in accordance with JIS P 8118:2014.
The density of the book paper was calculated from the basis weight and thickness of the book paper measured by the method described above in accordance with JIS P 8118:2014.
＜ＳＭＤ＞
得られた書籍用紙から、２０ｃｍ×２０ｃｍの試料を得た。
縦方向（ＭＤ方向）について測定する場合には、表面試験機ＫＥＳ－ＦＢ４（カトーテック株式会社製、ＫＥＳ－ＦＢシステム）に試料を測定方向がＭＤ方向と平行になるように、張力２０ｇｆ／ｃｍの張力でセットした。測定子は、測定幅５ｍｍとなるようにした直径０．５ｍｍのピアノ線で構成されており、測定子を通して試料表面に１０ｇｆの荷重を付与した。サンプルを速度０．１ｃｍ／ｓｅｃでＭＤ方向と平行な方向に水平に移動させ、測定距離３ｃｍの間の試料の表面厚さの変動（μｍ）を測定した。その際、測定距離（測定子の移動距離）を横軸に、測定した表面厚さを縦軸にしたチャートを作成し、さらに表面厚さの平均値を求めて、各測定点における、表面厚さとその平均値との差の絶対値を算出した。この差の絶対値を横軸の測定距離で積分し（チャートにおいて、表面厚さの折れ線とその平均値の直線によって囲まれた部分の面積を求め）、さらにこの積分値を測定距離で割った値が表面粗さ（ＳＭＤ）とした。なお、１試料当たり、任意の３箇所で測定を行い、３試料から得られた合計９つの測定結果の相加平均値を（ＳＭＤ）とした。
ＣＤ方向について測定する場合には、同様に、表面試験機に試料をＣＤ方法に平行になるようにセットし、ＣＤ方向と平行な方向に水平に移行させて、表面厚さの変動を測定した。
<SMD>
A 20 cm x 20 cm sample was obtained from the obtained book paper.
When measuring in the longitudinal direction (MD direction), place the sample on a surface tester KES-FB4 (manufactured by Kato Tech Co., Ltd., KES-FB system) with a tension of 20 gf/cm so that the measurement direction is parallel to the MD direction. It was set at a tension of . The probe was made of piano wire with a diameter of 0.5 mm and had a measurement width of 5 mm, and a load of 10 gf was applied to the sample surface through the probe. The sample was moved horizontally in a direction parallel to the MD direction at a speed of 0.1 cm/sec, and the variation (μm) in the surface thickness of the sample was measured over a measurement distance of 3 cm. At that time, create a chart with the measured distance (traveling distance of the probe) on the horizontal axis and the measured surface thickness on the vertical axis, and then calculate the average value of the surface thickness to determine the surface thickness at each measurement point. The absolute value of the difference between the average value and the average value was calculated. The absolute value of this difference was integrated by the measured distance on the horizontal axis (calculate the area of the part surrounded by the surface thickness line and the straight line of its average value on the chart), and then this integrated value was divided by the measured distance. The value was defined as surface roughness (SMD). Note that measurements were performed at three arbitrary locations per sample, and the arithmetic mean value of a total of nine measurement results obtained from the three samples was defined as (SMD).
When measuring in the CD direction, the sample was similarly set in the surface testing machine so as to be parallel to the CD method, and the variation in surface thickness was measured by moving the sample horizontally in a direction parallel to the CD direction. .
＜比引張強さ＞
比引張強さは、ＪＩＳ Ｐ ８１１３：２００６に準拠して測定した。
縦方向および横方向のそれぞれについて、１０回ずつ測定し、比引張強さを測定し、縦方向と横方向のそれぞれの相加平均値を算出後、縦横のそれぞれの相加平均値から相乗平均値を算出し、縦横平均の比引張強さとした。
<Specific tensile strength>
Specific tensile strength was measured in accordance with JIS P 8113:2006.
Measure 10 times each in the vertical and horizontal directions, measure the specific tensile strength, calculate the arithmetic average value in the vertical and horizontal directions, and then calculate the geometric average from the arithmetic average values in the vertical and horizontal directions. The value was calculated and taken as the average specific tensile strength in the vertical and horizontal directions.
＜長さ加重繊維長、繊維幅およびルンケル比＞
得られた書籍用紙をＪＩＳ Ｐ ８２２０：２０１２に従い離解し、得られたパルプ繊維分散スラリーの繊維長を、繊維長測定装置カヤーニファイバーラボＶｅｒ４．０（メッツォオートメーション社製）を用いて測定した。
なお、長さ加重平均繊維長は投影長さを示しており、平均繊維幅は投影幅を示している。
また、上記繊維長測定装置を用いて、繊維壁厚（μｍ）、ルーメン径（μｍ）を測定し、ルンケル比を下記式に従った算出した。
ルンケル比＝繊維壁厚×２／ルーメン径
<Length weighted fiber length, fiber width and Runkel ratio>
The obtained book paper was disintegrated in accordance with JIS P 8220:2012, and the fiber length of the obtained pulp fiber dispersion slurry was measured using a fiber length measuring device Kayani Fiber Lab Ver. 4.0 (manufactured by Metso Automation).
Note that the length-weighted average fiber length indicates the projected length, and the average fiber width indicates the projected width.
Further, the fiber wall thickness (μm) and lumen diameter (μm) were measured using the fiber length measuring device, and the Runkel ratio was calculated according to the following formula.
Runkel ratio = fiber wall thickness x 2 / lumen diameter
＜手触り感＞
書籍用紙の手触り感については、下記の評価基準で評価を行った。
実施例および比較例で得た書籍用紙について、銘柄を隠した状態で官能評価を実施した。５０人に書籍用紙を触ってもらい、肌に当てたときの手触りを４段階で評価を行った。最も多い評価を、当該書籍用紙の評価とした。評価人数が同じであった場合には、最も高い評価を採用した。表２に示した記号の意味を示す。
Ａ：特に優れる
Ｂ：優れる
Ｃ：やや劣る
Ｄ：劣る
<Touch feeling>
The feel of book paper was evaluated using the following evaluation criteria.
Sensory evaluation was performed on the book paper obtained in Examples and Comparative Examples with the brands hidden. Fifty people were asked to touch the book paper and rate the feel of the paper against their skin on a four-point scale. The most frequently evaluated evaluation was taken as the evaluation of the book paper. If the number of evaluators was the same, the highest evaluation was adopted. The meanings of the symbols shown in Table 2 are shown below.
A: Especially excellent B: Excellent C: Slightly inferior D: Inferior
表１および表２によれば、平均ＳＭＤ、表裏面のＳＭＤの差、構成するパルプの加重平均繊維長、および坪量が本発明の範囲を満たす実施例１～３では、表裏面ともに手触り感に優れ、かつ、書籍用紙として十分な紙質強度を有する書籍用紙が得られた。
一方、表裏面のＳＭＤの差が０．０７０μｍを超える比較例１、２、３および４では、十分な紙質強度を得られなかったり、手触り感に劣るものであった。特に、平均ＳＭＤが０．８００μｍを超え、かつ、表裏面のＳＭＤの差が０．０７０μｍを超える比較例２では、手触り感に劣るものであった。
According to Tables 1 and 2, in Examples 1 to 3, in which the average SMD, the difference in SMD between the front and back surfaces, the weighted average fiber length of the constituent pulp, and the basis weight satisfy the range of the present invention, both the front and back surfaces had a good texture. A book paper with excellent properties and sufficient paper strength as book paper was obtained.
On the other hand, in Comparative Examples 1, 2, 3, and 4 in which the difference in SMD between the front and back surfaces exceeded 0.070 μm, sufficient paper strength could not be obtained or the texture was poor. In particular, Comparative Example 2, in which the average SMD exceeded 0.800 μm and the difference in SMD between the front and back surfaces exceeded 0.070 μm, had poor feel to the touch.
Claims (10)
ＫＥＳ試験法により測定した縦横平均の表面粗さ（平均ＳＭＤ）が、０．８００μｍ以下であり、かつ、表裏面のＳＭＤの差が０．０７０μｍ以下であり、
構成するパルプ成分の長さ加重平均繊維長が０．９０ｍｍ以下であり、
坪量が５０ｇ／ｍ２以上９０ｇ／ｍ２以下であり、
前記書籍用紙が予め両性ポリマーにより処理した炭酸カルシウムを配合してなり、
前記書籍用紙が塗工層を有しない、
書籍用紙。 Book paper,
The vertical and horizontal average surface roughness (average SMD) measured by the KES test method is 0.800 μm or less, and the difference in SMD between the front and back surfaces is 0.070 μm or less,
The length weighted average fiber length of the constituent pulp components is 0.90 mm or less,
The basis weight is 50 g/m 2 or more and 90 g/m 2 or less ,
The book paper is blended with calcium carbonate that has been previously treated with an amphoteric polymer,
the book paper does not have a coating layer;
book paper.
Claim 9, wherein the press linear pressure during primary dehydration in the double-sided dewatering paper machine is 30 kN/m or more and 90 kN/m or less, and the press linear pressure during secondary dehydration is 70 kN/m or more and 130 kN/m or less. Method of manufacturing the book paper described.
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| JP3848052B2 (en) * | 2000-05-01 | 2006-11-22 | 紀州製紙株式会社 | Book paper |
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