JP2024026131A - coated paper for printing - Google Patents
coated paper for printing Download PDFInfo
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- JP2024026131A JP2024026131A JP2023197461A JP2023197461A JP2024026131A JP 2024026131 A JP2024026131 A JP 2024026131A JP 2023197461 A JP2023197461 A JP 2023197461A JP 2023197461 A JP2023197461 A JP 2023197461A JP 2024026131 A JP2024026131 A JP 2024026131A
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- paper
- printing
- weight
- calcium carbonate
- pigment
- Prior art date
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- 238000007639 printing Methods 0.000 title claims abstract description 74
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 115
- 239000000049 pigment Substances 0.000 claims abstract description 94
- 239000011247 coating layer Substances 0.000 claims abstract description 60
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 56
- 239000002245 particle Substances 0.000 claims abstract description 13
- 238000000576 coating method Methods 0.000 claims description 61
- 239000011248 coating agent Substances 0.000 claims description 58
- CRDNMYFJWFXOCH-BUHFOSPRSA-N Couroupitine B Natural products N\1C2=CC=CC=C2C(=O)C/1=C1/C2=CC=CC=C2NC1=O CRDNMYFJWFXOCH-BUHFOSPRSA-N 0.000 claims description 3
- CRDNMYFJWFXOCH-UHFFFAOYSA-N indirubin Chemical compound N1C2=CC=CC=C2C(=O)C1=C1C2=CC=CC=C2NC1=O CRDNMYFJWFXOCH-UHFFFAOYSA-N 0.000 claims description 3
- 239000000123 paper Substances 0.000 description 132
- 235000010216 calcium carbonate Nutrition 0.000 description 52
- 239000000853 adhesive Substances 0.000 description 25
- 230000001070 adhesive effect Effects 0.000 description 25
- 239000007788 liquid Substances 0.000 description 17
- 239000004816 latex Substances 0.000 description 15
- 229920000126 latex Polymers 0.000 description 15
- 229920002472 Starch Polymers 0.000 description 13
- 238000000034 method Methods 0.000 description 13
- 239000007787 solid Substances 0.000 description 13
- 235000019698 starch Nutrition 0.000 description 13
- 239000005995 Aluminium silicate Substances 0.000 description 12
- 229920001131 Pulp (paper) Polymers 0.000 description 12
- 235000012211 aluminium silicate Nutrition 0.000 description 12
- 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 12
- 239000004927 clay Substances 0.000 description 11
- 239000008107 starch Substances 0.000 description 10
- 239000000945 filler Substances 0.000 description 9
- 239000010410 layer Substances 0.000 description 9
- 239000011230 binding agent Substances 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 8
- 239000004372 Polyvinyl alcohol Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 229920002451 polyvinyl alcohol Polymers 0.000 description 6
- 230000002378 acidificating effect Effects 0.000 description 5
- 238000003490 calendering Methods 0.000 description 5
- 229920001577 copolymer Polymers 0.000 description 5
- 238000011161 development Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 102220043159 rs587780996 Human genes 0.000 description 5
- 229920003048 styrene butadiene rubber Polymers 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 229910001868 water Inorganic materials 0.000 description 5
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 4
- 239000000975 dye Substances 0.000 description 4
- 238000004513 sizing Methods 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 235000010755 mineral Nutrition 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 239000001254 oxidized starch Substances 0.000 description 3
- 235000013808 oxidized starch Nutrition 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 239000012463 white pigment Substances 0.000 description 3
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000002518 antifoaming agent Substances 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
- 125000002091 cationic group Chemical group 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 239000002655 kraft paper Substances 0.000 description 2
- 239000012860 organic pigment Substances 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 235000018102 proteins Nutrition 0.000 description 2
- 102000004169 proteins and genes Human genes 0.000 description 2
- 108090000623 proteins and genes Proteins 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-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
- 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
- GAWIXWVDTYZWAW-UHFFFAOYSA-N C[CH]O Chemical group C[CH]O GAWIXWVDTYZWAW-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229920002134 Carboxymethyl cellulose 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
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 229920000881 Modified starch Polymers 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
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 108010073771 Soybean Proteins Proteins 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- DZHMRSPXDUUJER-UHFFFAOYSA-N [amino(hydroxy)methylidene]azanium;dihydrogen phosphate Chemical compound NC(N)=O.OP(O)(O)=O DZHMRSPXDUUJER-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 229920006243 acrylic copolymer Polymers 0.000 description 1
- -1 alkyl ketene dimers Chemical class 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000001045 blue dye Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 229920003090 carboxymethyl hydroxyethyl cellulose Polymers 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 239000005018 casein Substances 0.000 description 1
- 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 description 1
- 235000021240 caseins Nutrition 0.000 description 1
- 229920006319 cationized starch Polymers 0.000 description 1
- 238000009993 causticizing Methods 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 239000008119 colloidal silica Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000011258 core-shell material Substances 0.000 description 1
- 235000019425 dextrin Nutrition 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000007850 fluorescent dye Substances 0.000 description 1
- 238000007646 gravure printing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 1
- 229920003063 hydroxymethyl cellulose Polymers 0.000 description 1
- 229940031574 hydroxymethyl cellulose Drugs 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 239000001023 inorganic pigment 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
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 235000019426 modified starch Nutrition 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 238000007645 offset printing Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000012766 organic filler 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
- 239000010893 paper waste Substances 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920000962 poly(amidoamine) Polymers 0.000 description 1
- 229920005990 polystyrene resin Polymers 0.000 description 1
- 239000001047 purple dye Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 235000019710 soybean protein Nutrition 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 238000004381 surface treatment 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
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-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
- 238000012546 transfer Methods 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
- UGZADUVQMDAIAO-UHFFFAOYSA-L zinc hydroxide Chemical compound [OH-].[OH-].[Zn+2] UGZADUVQMDAIAO-UHFFFAOYSA-L 0.000 description 1
- 229940007718 zinc hydroxide Drugs 0.000 description 1
- 229910021511 zinc hydroxide Inorganic materials 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/80—Paper comprising more than one coating
- D21H19/82—Paper comprising more than one coating superposed
Landscapes
- Paper (AREA)
Abstract
Description
本発明は高い白紙光沢度と高い強度を備える印刷用塗工紙に関する。 The present invention relates to a coated printing paper with high white paper gloss and high strength.
塗工紙は光沢塗工紙と艶消し塗工紙に大別される。光沢塗工紙の中でも高光沢塗工紙には、従来高級印刷に用いられていたアート紙、スーパーアート紙、あるいはカタログ、パンフレットなどに用いられるコート紙等があり、これらは印刷仕上がりにおいて白紙光沢度も印刷光沢度も高いグロス調となる。また、艶消し塗工紙は高光沢塗工紙よりも白紙光沢度や印刷光沢度が低い塗工紙であり、ダル調塗工紙、マット調塗工紙がある。 Coated paper is broadly divided into glossy coated paper and matte coated paper. Among glossy coated papers, high-gloss coated papers include art paper, super art paper, which was traditionally used for high-end printing, and coated paper used for catalogs, pamphlets, etc., and these have a white glossy finish in the printing finish. A glossy finish with high printing gloss and printing gloss. Furthermore, matte coated paper is coated paper that has lower white paper gloss and printing gloss than high-gloss coated paper, and includes dull coated paper and matte coated paper.
一般的に、高光沢塗工紙においては扁平な顔料であるカオリンまたはクレーを多量に使用することや、光沢発現性が良好なプラスチックピグメントを使用することで白紙光沢度を達成している。カオリンまたはクレーなどの扁平顔料の主面は酸性、側面は塩基性であり（非特許文献１）、塗工紙で一般的に使用されるラテックス等の接着剤は酸性基を含む。したがって、カオリンまたはクレーの主面は酸性であるのでラテックス等の接着剤との親和性が低い。一方、カオリンまたはクレーの側面は塩基性であるので接着剤との親和性が高いが面積が小さく充分な接着面積が達成できないことに起因して、強度の発現効率が低いという問題があった。 Generally, in high-gloss coated paper, white paper gloss is achieved by using a large amount of kaolin or clay, which are flat pigments, or by using plastic pigments with good gloss development properties. The main surface of a flat pigment such as kaolin or clay is acidic and the side surface is basic (Non-Patent Document 1), and adhesives such as latex commonly used in coated paper contain acidic groups. Therefore, since the main surface of kaolin or clay is acidic, it has low affinity with adhesives such as latex. On the other hand, since the side surfaces of kaolin or clay are basic, they have a high affinity with adhesives, but their area is small and a sufficient adhesion area cannot be achieved, resulting in a problem of low strength development efficiency.
カオリンまたはクレーは黄色～茶色い色味を持つ顔料であり、これを多用した塗工紙は黄色味が強いため、高光沢塗工紙の色相が黄色っぽくなる傾向があった。黄色味はＬ*ａ*ｂ*測色系におけるｂ*で示されるが、黄色味の強い紙はｂ*値が高くなる傾向がある。黄色味の強い紙に印刷した場合、印刷物全体の黄色味が強くなってしまうため、印刷物の発色が劣る傾向があった。 Kaolin or clay is a pigment with a yellow to brown tint, and coated paper that uses a lot of it has a strong yellow tint, so the hue of high-gloss coated paper tends to be yellowish. Yellowness is indicated by b * in the L * a * b * colorimetric system, and paper with a strong yellowness tends to have a high b * value. When printing on paper with a strong yellow tinge, the yellow tinge of the entire printed material becomes strong, so the color development of the printed material tends to be poor.
プラスチックピグメントは、非常に高価な資材であり、チラシ等の汎用の一般光沢塗工紙に使用することは困難であった。また、環境への配慮から有機顔料であるプラスチックピグメントの使用を避ける例が増えてきている。 Plastic pigments are very expensive materials, and it has been difficult to use them for general-purpose glossy coated paper such as flyers. In addition, there is an increasing number of cases in which the use of plastic pigments, which are organic pigments, are avoided due to environmental considerations.
この他に高光沢塗工紙に関して、平均粒子径０．５０μｍ以下の非常に細かい炭酸カルシウムを使用して光沢度を向上させる技術が提案されている（特許文献２）。しかし、粒子径が細かすぎる炭酸カルシムは比表面積も大きくなってしまうため、バインダー要求量が高くなり、結果的に紙力が低下してしまう恐れがあった。 In addition, regarding high-gloss coated paper, a technique has been proposed in which the gloss is improved using very fine calcium carbonate with an average particle size of 0.50 μm or less (Patent Document 2). However, calcium carbonate whose particle size is too small has a large specific surface area, which increases the amount of binder required, which may result in a decrease in paper strength.
本発明は高い白紙光沢度と高い強度を備える印刷用塗工紙を提供することを課題とする。 An object of the present invention is to provide a coated paper for printing that has high white paper gloss and high strength.
本発明者は上記課題に鑑み、鋭意検討を重ねた結果、特定の微粒炭酸カルシウムを含む顔料塗工層を備える印刷用塗工紙が上記課題を解決することを見出した。すなわち、前記課題は以下の本発明によって解決される。
［１］原紙の少なくとも片面に顔料塗工層を備え、
最外顔料塗層が０．５０μｍより大きく０．８０μｍ以下の平均粒子径（Ｄ５０）を有する炭酸カルシウムを含み、
白紙光沢度（７５°）が６０％以上である、印刷用塗工紙。
［２］前記最外顔料塗工層における顔料１００重量部中に、前記炭酸カルシウムを４０重量部以上含む、［１］に記載の印刷用塗工紙。
［３］前記炭酸カルシウムの平均粒子径（Ｄ５０）が０．５５～０．７５μｍである、［１］または［２］に記載の印刷用塗工紙。
［４］藍紅印刷部の印刷光沢度が７０％以上である［１］～［３］のいずれかに記載の印刷用塗工紙。
［５］前記最外顔料塗工層における顔料１００重量部中に、前記炭酸カルシウムを７５重量部以上含む、［２］に記載の印刷用塗工紙。
［６］複数の顔料塗工層を備え、かつ前記最外顔料塗工層の塗工量が最内顔料塗工層の塗工量より多い、［１］～［５］のいずれかに記載の印刷用塗工紙。
［７］最外塗工層の塗工量が、７ｇ／ｍ2以上である［１］～［６］のいずれかに記載の印刷用塗工紙。
In view of the above-mentioned problems, the inventors of the present invention have made extensive studies and found that a coated printing paper provided with a pigment coating layer containing a specific particulate calcium carbonate solves the above-mentioned problems. That is, the above-mentioned problem is solved by the present invention described below.
[1] A pigment coating layer is provided on at least one side of the base paper,
The outermost pigment coating layer contains calcium carbonate having an average particle diameter (D50) of more than 0.50 μm and less than 0.80 μm,
A coated paper for printing that has a white paper glossiness (75°) of 60% or more.
[2] The coated paper for printing according to [1], wherein 40 parts by weight or more of the calcium carbonate is contained in 100 parts by weight of the pigment in the outermost pigment coating layer.
[3] The coated paper for printing according to [1] or [2], wherein the calcium carbonate has an average particle diameter (D50) of 0.55 to 0.75 μm.
[4] The coated paper for printing according to any one of [1] to [3], wherein the printing gloss of the indigo-red printed area is 70% or more.
[5] The coated paper for printing according to [2], wherein 75 parts by weight or more of the calcium carbonate is contained in 100 parts by weight of the pigment in the outermost pigment coating layer.
[6] According to any one of [1] to [5], comprising a plurality of pigment coating layers, and the coating amount of the outermost pigment coating layer is greater than the coating amount of the innermost pigment coating layer. coated paper for printing.
[7] The coated paper for printing according to any one of [1] to [6], wherein the coating amount of the outermost coating layer is 7 g/m 2 or more.
本発明により、高い白紙光沢度と高い強度を備える印刷用塗工紙を提供できる。 ADVANTAGE OF THE INVENTION According to the present invention, a coated paper for printing having high white paper gloss and high strength can be provided.
以下、本発明を詳細に説明する。本発明において「～」はその端点を含む。すなわち「Ｘ～Ｙ」はＸおよびＹの値を含む。また、「ＸまたはＹ」はＸ、Ｙのいずれか一つ、あるいは双方を意味する。 The present invention will be explained in detail below. In the present invention, "~" includes its end points. That is, "X~Y" includes the values of X and Y. Moreover, "X or Y" means either one of X or Y, or both.
１．印刷用塗工紙
印刷用塗工紙とは原紙の上に設けられた顔料塗工層を備える印刷用の紙である。顔料塗工層とは白色顔料を主成分とする層である。本発明の印刷用塗工紙は、最外顔料塗工層が０．５０μｍより大きく０．８０μｍ以下の平均粒子径（Ｄ５０）を有する炭酸カルシウムを含有する。本発明の印刷用塗工紙は、用紙表面にオフセット印刷、グラビア印刷、オンデマンド印刷（レーザー方式、インクジェット方式、電子写真方式）、などの商業印刷を施すことができ、用途しては書籍、雑誌、ポスター、封筒、カレンダーなどが挙げられるが、これらに限定されない。
1. Coated Paper for Printing Coated paper for printing is paper for printing that has a pigment coating layer provided on a base paper. The pigment coating layer is a layer containing white pigment as a main component. In the coated printing paper of the present invention, the outermost pigment coating layer contains calcium carbonate having an average particle diameter (D50) of more than 0.50 μm and less than 0.80 μm. The coated paper for printing of the present invention can be subjected to commercial printing such as offset printing, gravure printing, on-demand printing (laser method, inkjet method, electrophotographic method) on the surface of the paper, and can be used for books, Examples include, but are not limited to, magazines, posters, envelopes, calendars, etc.
（１）顔料塗工層
１）顔料
顔料塗工層は平均粒子径（Ｄ５０）が０．５０μｍより大きく０．８０μｍ以下の炭酸カルシウム（以下、「第１の炭酸カルシウム」ともいう）を含む。Ｄ５０は体積５０％平均粒子径である。沈降法による顔料の粒度分布およびＤ５０は、Ｍａｌｖｅｒｎ社製、マスターサイザー３０００等により測定可能である。炭酸カルシウムのＤ５０の上限は０．７５μｍ以下であることが好ましく、０．７０μｍ以下であることが好ましい。顔料の比表面積とバインダー要求量の観点から下限は０．５５μｍ以上であることが好ましい。Ｄ５０上記範囲であれば塗工層が緻密になるため高光沢となり、さらに０．５０μｍ未満の顔料を使用した場合と比較してバインダー要求量が少ないため、優れた強度を備える印刷用塗工紙を得ることができる。
(1) Pigment Coating Layer 1) Pigment The pigment coating layer contains calcium carbonate (hereinafter also referred to as "first calcium carbonate") having an average particle diameter (D50) of more than 0.50 μm and less than 0.80 μm. D50 is the 50% volume average particle diameter. The particle size distribution and D50 of the pigment by the sedimentation method can be measured using Mastersizer 3000 manufactured by Malvern Co., Ltd. or the like. The upper limit of D50 of calcium carbonate is preferably 0.75 μm or less, and preferably 0.70 μm or less. From the viewpoint of the specific surface area of the pigment and the amount of binder required, the lower limit is preferably 0.55 μm or more. If D50 is within the above range, the coating layer will be dense, resulting in high gloss, and the amount of binder required will be smaller than when using pigments of less than 0.50 μm, resulting in coated paper for printing with excellent strength. can be obtained.
顔料塗工層が原紙の両面に存在する場合は、少なくとも一方の面の最外顔料塗工層が第１の炭酸カルシウムを含めばよい。 When pigment coating layers are present on both sides of the base paper, the outermost pigment coating layer on at least one side may contain the first calcium carbonate.
最外顔料塗工層における第１の炭酸カルシウムの配合量の下限は、当該顔料塗工層中の顔料１００重量部中、４０重量部以上であることが好ましく、７５重量部以上であることがより好ましく、８０重量部以上であることがより好ましい。全量を第１の炭酸カルシウムとしてもよい。第１の炭酸カルシウムは、重質炭酸カルシウムまたはパルプ製造工程の苛性化工程で製造された軽質炭酸カルシウム（苛性化軽質炭酸カルシウム、特許５２７４０７７号公報参照）であることが好ましい。 The lower limit of the amount of the first calcium carbonate in the outermost pigment coating layer is preferably 40 parts by weight or more, and preferably 75 parts by weight or more based on 100 parts by weight of the pigment in the pigment coating layer. More preferably, the amount is 80 parts by weight or more. The entire amount may be used as the first calcium carbonate. The first calcium carbonate is preferably heavy calcium carbonate or light calcium carbonate produced in the causticizing step of the pulp manufacturing process (causticized light calcium carbonate, see Japanese Patent No. 5274077).
顔料塗工層中の第１の炭酸カルシウム以外の白色顔料として、当該分野で通常使用されている顔料を用いることができる。その例としては、カオリン、クレー、エンジニアードカオリン、デラミネーテッドクレー、重質炭酸カルシウム、軽質炭酸カルシウム、タルク、二酸化チタン、硫酸バリウム、硫酸カルシウム、酸化亜鉛、珪酸、珪酸塩、コロイダルシリカ、サチンホワイトなどの無機顔料および密実型、中空型、またはコアーシェル型などの有機顔料が挙げられる。これらの顔料は複数種を組合せて使用してもよい。 As the white pigment other than the first calcium carbonate in the pigment coating layer, pigments commonly used in the field can be used. Examples include kaolin, clay, engineered kaolin, delaminated clay, heavy calcium carbonate, light calcium carbonate, talc, titanium dioxide, barium sulfate, calcium sulfate, zinc oxide, silicic acid, silicates, colloidal silica, satin. Examples include inorganic pigments such as white and organic pigments such as solid type, hollow type, or core-shell type. These pigments may be used in combination.
第１の炭酸カルシウム以外の白色顔料として、Ｄ５０が０．８０μｍを超える重質炭酸カルシウムまたは軽質炭酸カルシウム（以下、「第２の炭酸カルシウム」ともいう）を用いることが好ましい。炭酸カルシウムは接着剤（バインダー）との結着性に優れかつ白色度を向上するので、高い強度、白色度および印刷適性を達成できる。最外顔料塗工層中の顔料１００重量部中、第１および第２の炭酸カルシウムの合計量は９０重量部以上が好ましく、１００重量部がより好ましい。２層以上の顔料塗工層を有する場合、最外塗工層以外の顔料塗工層中の第１および第２の炭酸カルシウムの合計量は限定されないが前記範囲であることが好ましい。第２の炭酸カルシウムは、重質炭酸カルシウムまたは苛性化軽質炭酸カルシウムであることが好ましい。 As a white pigment other than the first calcium carbonate, it is preferable to use heavy calcium carbonate or light calcium carbonate (hereinafter also referred to as "second calcium carbonate") having a D50 of more than 0.80 μm. Calcium carbonate has excellent binding properties with adhesives (binder) and improves whiteness, so high strength, whiteness, and printability can be achieved. In 100 parts by weight of the pigment in the outermost pigment coating layer, the total amount of the first and second calcium carbonates is preferably 90 parts by weight or more, more preferably 100 parts by weight. When having two or more pigment coating layers, the total amount of the first and second calcium carbonate in the pigment coating layers other than the outermost coating layer is not limited, but is preferably within the above range. Preferably, the second calcium carbonate is ground calcium carbonate or causticized light calcium carbonate.
２）接着剤
顔料塗工層はマトリックスとして接着剤（バインダー）を含む。接着剤は限定されず、公知の接着剤を使用できる。その例としては、スチレン・ブタジエン系共重合体、スチレン・アクリル系共重合体、エチレン・酢酸ビニル系共重合体、ブタジエン・メチルメタクリレート系共重合体、酢酸ビニル・ブチルアクリレート系共重合体、無水マレイン酸共重合体、アクリル酸・メチルメタクリレート系共重合体等のラテックス；完全ケン化ポリビニルアルコール、部分ケン化ポリビニルアルコール、カルボキシ変性ポリビニルアルコール、アセトアセチル変性ポリビニルアルコール等のポリビニルアルコール類；カゼイン、大豆蛋白、合成蛋白等の蛋白質類；酸化澱粉、陽性澱粉、尿素燐酸エステル化澱粉、ヒドロキシエチルエーテル化澱粉などのエーテル化澱粉、デキストリン等の澱粉類；カルボキシメチルセルロース、ヒドロキシエチルセルロース、ヒドロキシメチルセルロース等のセルロース誘導体等が挙げられる。これらの複数種を組合せて使用できる。
2) Adhesive The pigment coating layer contains an adhesive (binder) as a matrix. The adhesive is not limited, and any known adhesive can be used. Examples include styrene/butadiene copolymers, styrene/acrylic copolymers, ethylene/vinyl acetate copolymers, butadiene/methyl methacrylate copolymers, vinyl acetate/butyl acrylate copolymers, anhydrous Latex such as maleic acid copolymer, acrylic acid/methyl methacrylate copolymer; polyvinyl alcohol such as fully saponified polyvinyl alcohol, partially saponified polyvinyl alcohol, carboxy-modified polyvinyl alcohol, acetoacetyl-modified polyvinyl alcohol; casein, soybean Proteins such as proteins and synthetic proteins; etherified starches such as oxidized starch, positive starch, urea phosphate starch, and hydroxyethyl etherified starch; starches such as dextrin; cellulose derivatives such as carboxymethyl cellulose, hydroxyethyl cellulose, and hydroxymethyl cellulose etc. These types can be used in combination.
接着剤の量は、印刷適性、塗工適性の点から、全顔料塗工層中の顔料１００重量部に対して５～３０重量部であることが好ましく、８～２５重量部であることがより好ましい。その上限としては２０重量部以下がより好ましく、１７重量部以下が最も好ましい。接着剤の総量が３０重量部を越える場合、顔料塗工液の粘度が高くなり塗工時に操業トラブルが生じ易い。さらにこの場合、インキの乾燥性が低下する傾向が見られる。一方、接着剤の総量が５重量部未満であると十分な表面強度を得にくくなる。 From the viewpoint of printability and coating suitability, the amount of adhesive is preferably 5 to 30 parts by weight, and preferably 8 to 25 parts by weight, based on 100 parts by weight of the pigment in the entire pigment coating layer. More preferred. The upper limit is more preferably 20 parts by weight or less, most preferably 17 parts by weight or less. If the total amount of the adhesive exceeds 30 parts by weight, the viscosity of the pigment coating solution increases and operational troubles are likely to occur during coating. Furthermore, in this case, there is a tendency for the drying properties of the ink to decrease. On the other hand, if the total amount of adhesive is less than 5 parts by weight, it becomes difficult to obtain sufficient surface strength.
本発明の印刷用塗工紙は、全接着剤中１０～８０重量％のラテックスを含むことが好ましく、１５～７０重量％のラテックスを含むことがより好ましい。ラテックスとはエマルションの形態の接着剤である。ラテックスとしてはスチレン・ブタジエン系ラテックスが好ましい。前述のとおり、炭酸カルシウムはカオリンまたはクレーと比較して、ラテックス等の酸性基を有する接着剤との親和性が良好である。このため本発明の印刷用塗工紙にラテックスを使用することで、強度発現性に優れた印刷用塗工紙を得ることができる。本発明の印刷用塗工紙は顔料塗工層を備えるが、２層以上の顔料塗工層を有する場合、原紙に最も近い層は全接着剤中１０～８０重量％のラテックスを含むことが好ましく、原紙に遠い層は３０～６０重量％のラテックスを含むことが好ましい。他の接着剤としては澱粉類を用いることが特に好ましく、その量は原紙に最も近い層では全接着剤中３０～９０重量％であることが好ましく、原紙に遠い層では４０～７０重量％であることが好ましい。 The coated printing paper of the present invention preferably contains 10 to 80% by weight of latex, more preferably 15 to 70% by weight of the total adhesive. Latex is an adhesive in the form of an emulsion. As the latex, styrene-butadiene latex is preferred. As mentioned above, calcium carbonate has better affinity with adhesives having acidic groups such as latex than kaolin or clay. Therefore, by using latex in the coated paper for printing of the present invention, a coated paper for printing with excellent strength development properties can be obtained. The coated paper for printing of the present invention has a pigment coating layer, but when it has two or more pigment coating layers, the layer closest to the base paper may contain 10 to 80% by weight of latex based on the total adhesive. Preferably, the layer remote from the base paper contains 30 to 60% by weight latex. It is particularly preferable to use starch as the other adhesive, and the amount thereof is preferably 30 to 90% by weight of the total adhesive in the layer closest to the base paper, and 40 to 70% by weight in the layer farthest from the base paper. It is preferable that there be.
３）他の添加剤
顔料塗工層は、必要に応じて、分散剤、増粘剤、保水剤、消泡剤、耐水化剤、染料、着色用顔料等、通常の塗工紙用顔料に配合される各種助剤を含んでいてもよい。
3) Other additives The pigment coating layer may contain dispersants, thickeners, water retention agents, antifoaming agents, water resistance agents, dyes, coloring pigments, etc., as necessary, in addition to ordinary pigments for coated paper. It may also contain various auxiliary agents.
４）塗工量
顔料塗工層の塗工量は、片面あたり固形分で７ｇ／ｍ2以上が好ましく、１０ｇ／ｍ2以上がより好ましく、１５ｇ／ｍ2以上がさらに好ましい。塗工量が７ｇ／ｍ2未満では、紙基材表面の凹凸を十分に覆うことができないため、印刷インキの受理性が著しく低下することがあり、また十分な白紙光沢度が得られない場合がある。一方、顔料塗工層の塗工量は、５０ｇ／ｍ2以下が好ましく、４０ｇ／ｍ2以下がより好ましく、３５ｇ／ｍ2以下がさらに好ましい。当該塗工量は片面あたりの全顔料塗工層の合計の値であるが、２層以上の顔料塗工層を有する場合、最内顔料塗工層（原紙に隣接する顔料塗工層）の塗工量は２～１５ｇ／ｍ2が好ましく、より好ましくは５～１２ｇ／ｍ2である。また、最外顔料塗工層の塗工量は７ｇ／ｍ2以上が好ましく、８ｇ／ｍ2以上がより好ましい。その上限は２０ｇ／ｍ2以下が好ましく、１５ｇ／ｍ2以下がより好ましい。光沢発現性には、最外塗工層の影響が大きいため、最外塗工層の塗工量は最内顔料塗工層の塗工量よりも多いことが好ましい。
4) Coating amount The coating amount of the pigment coating layer is preferably 7 g/m 2 or more in solid content per side, more preferably 10 g/m 2 or more, and even more preferably 15 g/m 2 or more. If the coating amount is less than 7 g/m 2 , the unevenness on the surface of the paper base material cannot be sufficiently covered, so the receptivity of printing ink may be significantly reduced, and sufficient white paper glossiness may not be obtained. There is. On the other hand, the coating amount of the pigment coating layer is preferably 50 g/m 2 or less, more preferably 40 g/m 2 or less, and even more preferably 35 g/m 2 or less. The coating amount is the total value of all pigment coating layers per side, but if there are two or more pigment coating layers, the amount of the innermost pigment coating layer (pigment coating layer adjacent to the base paper) The coating amount is preferably 2 to 15 g/m 2 , more preferably 5 to 12 g/m 2 . Further, the coating amount of the outermost pigment coating layer is preferably 7 g/m 2 or more, more preferably 8 g/m 2 or more. The upper limit is preferably 20 g/m 2 or less, more preferably 15 g/m 2 or less. Since the outermost coating layer has a large influence on gloss development, the coating amount of the outermost coating layer is preferably larger than the coating amount of the innermost pigment coating layer.
（２）原紙
１）パルプ
原紙には公知のパルプを使用できる。公知のパルプとしては、化学パルプ、砕木パルプ（ＧＰ）、リファイナー砕木パルプ（ＲＧＰ）、サーモメカニカルパルプ（ＴＭＰ）、ケモサーモメカニカルパルプ（ＣＴＭＰ）、ケミグランドパルプ（ＣＧＰ）、セミケミカルパルプ（ＳＣＰ）、古紙パルプなどが挙げられる。本発明においては、化学パルプを使用することが好ましい。化学パルプには、クラフトパルプ法により製造したものと、亜硫酸パルプ法により製造されたものがあり、本発明においてはその両方を使用することができるが、クラフト法により製造した化学パルプが生産コストの面から好適である。原料パルプに占める化学パルプの含有量は、白色度等の観点から、全パルプ中６０重量％以上が好ましく、８０重量％以上がより好ましく、９０重量％以上がさらに好ましく、９５重量％以上が特に好ましい。
(2) Base paper 1) Pulp Any known pulp can be used for the base paper. Known pulps include chemical pulp, groundwood pulp (GP), refiner groundwood pulp (RGP), thermomechanical pulp (TMP), chemothermomechanical pulp (CTMP), chemical ground pulp (CGP), and semi-chemical pulp (SCP). , waste paper pulp, etc. In the present invention, it is preferable to use chemical pulp. There are two types of chemical pulp: those manufactured by the kraft pulp method and those manufactured by the sulfite pulp method. Both can be used in the present invention, but the chemical pulp manufactured by the kraft method has a lower production cost. It is suitable from the viewpoint of The content of chemical pulp in the raw pulp is preferably 60% by weight or more in the total pulp, more preferably 80% by weight or more, even more preferably 90% by weight or more, particularly 95% by weight or more, from the viewpoint of whiteness etc. preferable.
２）填料
原紙には公知の填料を用いてよい。公知の填料としては、重質炭酸カルシム、軽質炭酸カルシウム、クレー、シリカ、軽質炭酸カルシウム－シリカ複合物、カオリン、焼成カオリン、デラミカオリン、ホワイトカーボン、タルク、炭酸マグネシウム、炭酸バリウム、硫酸バリウム、水酸化アルミニウム、水酸化カルシウム、水酸化マグネシウム、水酸化亜鉛、酸化亜鉛、酸化チタン、ケイ酸ナトリウムの鉱酸による中和で製造される非晶質シリカ等の無機填料や、尿素－ホルマリン樹脂、メラミン系樹脂、ポリスチレン樹脂、フェノール樹脂などの有機填料が挙げられる。この中でも、中性抄紙やアルカリ抄紙における代表的な填料である重質炭酸カルシウムや軽質炭酸カルシウムが不透明度向上のためにも好ましく使用される。填料として使用する炭酸カルシウムは前述の第１の炭酸カルシウムであってもよいし第２の炭酸カルシウムであってもよいが、軽質炭酸カルシウムが好ましい。紙中填料率は特に制限されないが、１～４０重量％が好ましく、１０～３５重量％がさらに好ましい。原紙の強度等を考慮すると、より好ましくは１０～２０重量％である。
2) Filler Known fillers may be used for the base paper. Known fillers include heavy calcium carbonate, light calcium carbonate, clay, silica, light calcium carbonate-silica composite, kaolin, calcined kaolin, delamic kaolin, white carbon, talc, magnesium carbonate, barium carbonate, barium sulfate, and water. Inorganic fillers such as amorphous silica produced by neutralizing aluminum oxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, zinc oxide, titanium oxide, and sodium silicate with mineral acids, urea-formalin resin, and melamine. Examples include organic fillers such as resins, polystyrene resins, and phenol resins. Among these, heavy calcium carbonate and light calcium carbonate, which are typical fillers for neutral papermaking and alkaline papermaking, are preferably used to improve opacity. The calcium carbonate used as the filler may be the above-mentioned first calcium carbonate or the second calcium carbonate, but light calcium carbonate is preferable. The filler percentage in the paper is not particularly limited, but is preferably 1 to 40% by weight, more preferably 10 to 35% by weight. Considering the strength of the base paper, etc., the content is more preferably 10 to 20% by weight.
３）その他
公知の製紙用添加剤も使用できる。例えば、硫酸バンドや各種のアニオン性、カチオン性、ノニオン性あるいは、両性の歩留まり向上剤、濾水性向上剤、各種紙力増強剤や内添サイズ剤等の抄紙用内添助剤を必要に応じて使用することができる。乾燥紙力向上剤としてはポリアクリルアミド、カチオン化澱粉などが挙げられ、湿潤紙力向上剤としてはポリアミドアミンエピクロロヒドリンなどが挙げられる。これらの薬品は地合や操業性などの影響の無い範囲で添加される。内添サイズ剤としてはアルキルケテンダイマーやアルケニル無水コハク酸、ロジンサイズ剤などが挙げられる。更に、染料、顔料、蛍光増白剤、ｐＨ調整剤、消泡剤、ピッチコントロール剤、スライムコントロール剤等も必要に応じて添加することができる。
3) Others Known paper-making additives can also be used. For example, internal additives for papermaking such as sulfuric acid, various anionic, cationic, nonionic, or amphoteric retention improvers, freeness improvers, various paper strength enhancers, and internal sizing agents are added as necessary. can be used. Examples of the dry paper strength improver include polyacrylamide and cationized starch, and examples of the wet paper strength improver include polyamidoamine epichlorohydrin. These chemicals are added within a range that does not affect the formation or operability. Examples of internally added sizing agents include alkyl ketene dimers, alkenyl succinic anhydrides, and rosin sizing agents. Furthermore, dyes, pigments, optical brighteners, pH adjusters, antifoaming agents, pitch control agents, slime control agents, etc. can also be added as necessary.
４）原紙の坪量
本発明の印刷用塗工紙の原紙の坪量は４０～１６０ｇ／ｍ2が好ましく、４５～１５０ｇ／ｍ2がより好ましく、５０～１４０ｇ／ｍ2がさらに好ましい。
4) Basis weight of base paper The basis weight of the base paper of the coated printing paper of the present invention is preferably 40 to 160 g/m 2 , more preferably 45 to 150 g/m 2 , and even more preferably 50 to 140 g/m 2 .
５）クリア塗工層
本発明の印刷用塗工紙は、上述した原紙の片面または両面にクリア（透明）塗工層を有していてもよい。原紙上にクリア塗工を施すことにより、原紙の表面強度や平滑性を向上させることができ、また、顔料塗工をする際の塗工適性を向上させることができる。クリア塗工の量は、片面あたり固形分で０．１～３．０ｇ／ｍ2が好ましく、０．２～２．０ｇ／ｍ2がより好ましく、さらに好ましくは０．５～２．０ｇ／ｍ2である。
5) Clear coating layer The coated paper for printing of the present invention may have a clear (transparent) coating layer on one or both sides of the above-mentioned base paper. By applying a clear coating to the base paper, the surface strength and smoothness of the base paper can be improved, and the suitability for pigment coating can also be improved. The amount of clear coating is preferably 0.1 to 3.0 g/m 2 in solid content per side, more preferably 0.2 to 2.0 g/m 2 , and even more preferably 0.5 to 2.0 g/m 2 . m2 .
本発明においてクリア塗工とは、例えば、２ロールポンドサイズプレス、ゲートロールコーター、プレメタリングサイズプレス、カーテンコーター、スプレーコーターなどのコータ（塗工機）を使用して、澱粉、酸化澱粉、各種変性澱粉（自家変性、カチオン変性等）などの澱粉類、ポリアクリルアミド、ポリビニルアルコールなどの水溶性高分子を主成分とする塗布塗工液（表面処理液）を、原紙上に塗布塗工（サイズプレス）することをいう。クリア塗工液にサイズ剤を含有させて塗工することもできる。本発明においては澱粉を塗工することが好ましい。 In the present invention, clear coating refers to coating of starch, oxidized starch, A coating liquid (surface treatment liquid) containing starches such as various modified starches (self-modified, cationic modified, etc.) and water-soluble polymers such as polyacrylamide and polyvinyl alcohol is applied onto base paper ( size press). Coating can also be carried out by adding a sizing agent to the clear coating solution. In the present invention, it is preferable to coat with starch.
２．製造方法
本発明の印刷用塗工紙は公知の方法で製造できるが、原紙上に、顔料と接着剤を含む顔料塗工液を塗工することにより製造することが好ましい。
2. Manufacturing method The coated paper for printing of the present invention can be manufactured by a known method, but it is preferably manufactured by coating a pigment coating liquid containing a pigment and an adhesive onto a base paper.
（１）原紙の調製
本発明で用いられる原紙に使用される原料についてはすでに述べたとおりである。原紙は公知の抄紙方法で製造される。例えば、トップワイヤー等を含む長網抄紙機、オントップフォーマー、ギャップフォーマ、丸網抄紙機、長網抄紙機と丸網抄紙機を併用した板紙抄紙機、ヤンキードライヤーマシン等を用いて行うことができる。抄紙時のｐＨは、酸性、中性、アルカリ性のいずれでもよいが、中性またはアルカリ性が好ましい。抄紙速度も特に限定されない。本発明で用いられる原紙は、単層でも多層でもよいが、単層の原紙が好適に使用される。
(1) Preparation of base paper The raw materials used for the base paper used in the present invention are as described above. The base paper is manufactured by a known papermaking method. For example, using a Fourdrinier paper machine including a top wire, an on-top former, a gap former, a circular wire paper machine, a paperboard machine using a combination of a Fourdrinier paper machine and a circular wire paper machine, a Yankee dryer machine, etc. I can do it. The pH during papermaking may be acidic, neutral, or alkaline, but preferably neutral or alkaline. Paper making speed is also not particularly limited. The base paper used in the present invention may be single-layer or multi-layer, but single-layer base paper is preferably used.
（２）原紙の平滑化処理
得られた原紙に顔料塗工液を塗工する前に、各種カレンダー装置により原紙に平滑化処理を施すことが好ましい。かかるカレンダー装置としては、スーパーカレンダー、ソフトカレンダー等の一般に使用されているカレンダー装置が適宜使用できる。カレンダー仕上げ条件としては、剛性ロールの温度、カレンダー圧力、ニップ数、ロール速度、カレンダー前の紙水分等が、要求される品質に応じて適宜選択される。原紙にカレンダー処理を施すことで、原紙の平滑性が向上し、顔料塗工適性が向上する。
(2) Smoothing treatment of base paper Before applying a pigment coating liquid to the obtained base paper, it is preferable to perform a smoothing treatment on the base paper using various calender devices. As such a calender device, commonly used calender devices such as a super calender and a soft calender can be appropriately used. As the calender finishing conditions, the temperature of the rigid roll, the calender pressure, the number of nips, the roll speed, the paper moisture before the calender, etc. are appropriately selected depending on the required quality. Calendering the base paper improves the smoothness of the base paper and improves its suitability for pigment coating.
（３）顔料塗工液の調製
顔料塗工液は顔料、接着剤、および必要に応じて添加剤を水に分散または溶解することで調製できる。前述の顔料塗工層を形成できるように各成分の配合は調整される。ブレード塗工を行う場合は、顔料塗工液の固形分濃度は４０～７０重量％が好ましく、より好ましくは６０～７０重量％である。顔料塗工液の粘度は室温にて６０ｒｐｍで測定したＢ型粘度が５００～５０００ｍＰａ・ｓの範囲であることが好ましい。また、ロールコーターで塗工を行う場合は、顔料塗工液の固形分は３０～６０重量％が好ましく、より好ましくは４０～６０重量％である。固形分重量が低すぎるとブレード塗工ではバックフロー等が起きてしまい、高すぎるとブレード負荷が大きくなりブレードの摩耗が進む、ロールコーターではボイリングが発生するなど、操業性に影響が出る。
(3) Preparation of pigment coating liquid The pigment coating liquid can be prepared by dispersing or dissolving the pigment, adhesive, and, if necessary, additives in water. The composition of each component is adjusted so that the pigment coating layer described above can be formed. When blade coating is performed, the solid content concentration of the pigment coating liquid is preferably 40 to 70% by weight, more preferably 60 to 70% by weight. The viscosity of the pigment coating liquid is preferably a type B viscosity in the range of 500 to 5000 mPa·s measured at 60 rpm at room temperature. Further, when coating is performed using a roll coater, the solid content of the pigment coating liquid is preferably 30 to 60% by weight, more preferably 40 to 60% by weight. If the solid content weight is too low, backflow will occur during blade coating, while if it is too high, the blade load will increase and blade wear will progress, and in roll coaters, operability will be affected, such as boiling occurring.
（４）塗工方法
塗工方法は限定されず、ロールコーター、ブレードコーター等の公知の塗工方法を用いることができる。塗工速度も特に限定されないが、ブレードコーターの場合は４００～１８００ｍ／分、ロールコーターの場合は４００～２０００ｍ／分が好ましい。本発明においては、顔料塗工層を１層ブレードコーターで塗工してもよく、ロールコーターで塗工した後にブレードコーターで塗工してもよいし、ブレードコーターで塗工した後にブレードコーターで塗工してもよいが、表面の平滑性を向上させることができるため、最外塗工層の塗工にブレードコーターを用いることが好ましい。
(4) Coating method The coating method is not limited, and known coating methods such as a roll coater and a blade coater can be used. The coating speed is also not particularly limited, but it is preferably 400 to 1,800 m/min in the case of a blade coater, and 400 to 2,000 m/min in the case of a roll coater. In the present invention, a single pigment coating layer may be applied using a blade coater, it may be applied using a roll coater and then a blade coater, or it may be applied using a blade coater and then a blade coater. Although it may be coated, it is preferable to use a blade coater for coating the outermost coated layer because the surface smoothness can be improved.
本発明の印刷用塗工紙は少なくとも片面に顔料塗工層を有しており、２層以上の顔料塗工層を設けてもよい。顔料塗工層を２層以上とした場合、繊維被覆性が向上し、平滑度も高くなる。３層以上とすると塗工量を増やすことができるため塗工紙の品質は向上するが、コストや操業性の点から層数は１層または２層であることが好ましい。前述のとおり原紙の上にクリア塗工層を設け、その上に顔料塗工層を設けてもよい。 The coated paper for printing of the present invention has a pigment coating layer on at least one side, and may have two or more pigment coating layers. When the number of pigment coating layers is two or more, fiber coverage is improved and smoothness is also increased. When the number of layers is three or more, the coating amount can be increased and the quality of the coated paper is improved, but from the viewpoint of cost and operability, the number of layers is preferably one or two. As described above, a clear coating layer may be provided on the base paper, and a pigment coating layer may be provided thereon.
（５）その他の工程
湿潤状態の塗工層を乾燥させる方法は限定されず、例えば蒸気加熱シリンダ、加熱熱風エアドライヤ、ガスヒータードライヤ、電気ヒータードライヤ、赤外線ヒータードライヤ等を用いることができる。
(5) Other Steps The method of drying the wet coating layer is not limited, and for example, a steam heating cylinder, heated hot air air dryer, gas heater dryer, electric heater dryer, infrared heater dryer, etc. can be used.
本発明印刷用塗工紙は、以上のように製造した塗工紙を表面処理してもよく、高い光沢度を得るためにカレンダー処理を行うことが好ましい。カレンダー処理を行う場合には、スーパーカレンダー、ソフトカレンダー等の一般に使用されているカレンダー装置が適宜使用できる。カレンダー仕上げ条件としては、剛性ロールの温度、カレンダー圧力、ニップ数、ロール速度、カレンダー前の紙水分等が、要求される品質に応じて適宜選択されるが、本発明の印刷用塗工紙においてはホットソフトニップカレンダー処理を行うことがより好ましい。当該処理条件は線圧１４０～３００ｋＮ／ｍ、温度７０～３００℃で、５ニップ以上が好ましい。処理速度は２００～８００ｍ／ｍｉｎ程度である。 For the coated paper for printing of the present invention, the coated paper produced as described above may be surface-treated, and in order to obtain high gloss, it is preferable to perform a calender treatment. When calendering is performed, commonly used calendering devices such as super calendars and soft calendars can be used as appropriate. Calender finishing conditions include the temperature of the rigid roll, calender pressure, number of nips, roll speed, and paper moisture before calendering, which are appropriately selected depending on the required quality. It is more preferable to perform hot soft nip calender treatment. The processing conditions are a linear pressure of 140 to 300 kN/m, a temperature of 70 to 300° C., and preferably 5 nips or more. The processing speed is about 200 to 800 m/min.
３．紙質
（１）白紙光沢度
白紙光沢度は白紙での光沢度合いを示す指標であり、本発明においてはＪＩＳ－Ｐ８１４２に従い測定される、紙面の法線に対して７５°の角度における鏡面光沢度である。本発明の印刷用塗工紙は、白紙光沢度の高い高光沢な印刷用塗工紙である。本発明の印刷用塗工紙の白紙光沢度は６０％以上であり、６５％以上が好ましく、７０％以上がより好ましい。白紙光沢度の上限は限定されないが、１００％以下である。
3. Paper quality (1) White paper glossiness White paper glossiness is an index indicating the degree of glossiness of white paper, and in the present invention, it is measured according to JIS-P8142 and is specular glossiness at an angle of 75° to the normal line of the paper surface. be. The coated paper for printing of the present invention is a high-gloss coated paper for printing with high white paper gloss. The white paper gloss of the coated printing paper of the present invention is 60% or more, preferably 65% or more, and more preferably 70% or more. The upper limit of white paper glossiness is not limited, but is 100% or less.
（２）印刷光沢度
印刷光沢度は、印刷後の印刷物の光沢度合を示す指標であり、本発明においては後述の方法で測定される。藍紅印刷部の印刷光沢度（ＣＭ）は７０以上が好ましく、７５％以上が好ましい。
(2) Print Glossiness Print glossiness is an index indicating the glossiness of printed matter after printing, and is measured by the method described below in the present invention. The print glossiness (CM) of the indigo-red printed area is preferably 70 or more, preferably 75% or more.
以下に実施例を挙げて、本発明を具体的に説明するがこれらによって本発明は限定されない。重量部および重量％は固形分換算の値である。 The present invention will be specifically described below with reference to Examples, but the present invention is not limited by these. Weight parts and weight % are values in terms of solid content.
＜評価方法＞
（１）坪量
ＪＩＳ Ｐ ８１２４に準じて測定した。
（２）ＩＳＯ白色度：ＪＩＳ Ｐ８１４８に準拠し、村上色彩（株）製色差計ＣＭＳ－３５ＳＰＸにて、紫外光を含む条件にて測定した。
（３）白紙光沢度
ＪＩＳ－Ｐ８１４２に基づいて測定した。
（４）印刷光沢度
ローランド社製オフセット枚葉印刷機（４色）にてオフセット枚葉用インキ（東洋インキ（株）製ＮＥＸ－Ｍ）を用い、印刷速度８０００枚／ｈｒでベタ部のインキ着肉濃度が藍１．６０、紅１．５０となる様に藍紅（ＣＭ）の順に印刷した。得られた印刷物の藍紅（ＣＭ）ベタ印刷部の光沢度を、ＪＩＳ Ｐ－８１４２に基づいて測定した。
（５）印刷表面強度
ＲＩ－Ｉ型印刷機（明製作所製）を用い、印刷用インキ（東洋インキ製ＮＥＸ－Ｙ）を使用して印刷後、ゴムロールについて印刷跡を転写紙に手動で転写してピッキングの程度を目視で相対評価した。評価基準は以下の通りである。
Ａ＝ほとんど発生しない、Ｂ＝発生する
<Evaluation method>
(1) Basis weight Measured according to JIS P 8124.
(2) ISO whiteness: Measured in accordance with JIS P8148 using a color difference meter CMS-35SPX manufactured by Murakami Color Co., Ltd. under conditions including ultraviolet light.
(3) White paper glossiness Measured based on JIS-P8142.
(4) Printing glossiness Using offset sheet-fed ink (NEX-M manufactured by Toyo Ink Co., Ltd.) on a Roland offset sheet-fed printing machine (4 colors), the ink in the solid area was printed at a printing speed of 8000 sheets/hr. Printing was performed in the order of blue and red (CM) so that the ink density was 1.60 for blue and 1.50 for red. The glossiness of the blue-red (CM) solid printed area of the obtained printed matter was measured based on JIS P-8142.
(5) Printing surface strength After printing using a printing ink (NEX-Y manufactured by Toyo Ink) using a RI-I type printing machine (manufactured by Mei Seisakusho), the printing marks on the rubber roll were manually transferred to transfer paper. The degree of picking was visually evaluated. The evaluation criteria are as follows.
A = Rarely occurs, B = Occurs
＜材料＞
以下を用いた。
（１）重質炭酸カルシウム
株式会社ファイマテック製、商品名：ＦＭＴ９７、Ｄ５０＝０．８８μｍ
株式会社ファイマテック製、商品名：ＦＭＴ７５、Ｄ５０＝１．６５μｍ
株式会社ファイマテック製、商品名：カービタル９０、Ｄ５０＝１．２２μｍ
株式会社ファイマテック製、商品名：ＦＭＴ１００ＹＦ、Ｄ５０＝０．５９μｍ
株式会社ファイマテック製、商品名：ＦＭＴ１００、Ｄ５０＝０．６５μｍ
株式会社イメリスミネラルズ・ジャパン製、商品名：カービタル９７、Ｄ５０＝０．８８μｍ
（２）クレー
Ｋａｍｉｎ社製、ハイドラグロス Ｄ５０＝０．２２μｍ
イメリスミネラルズ・ジャパン製、プレミア、Ｄ５０＝２．０５５μｍ
（３）接着剤
スチレン・ブタジエン系共重合ラテックス
澱粉：
ダイナコート６８ＮＢ（ジー・エス・エルジャパン株式会社製）
バイオラテックス（Ｅｃｏｓｙｎｔｈｅｔｉｘ社製）
（４）染料
紫染料（御国色素株式会社製）
青染料（御国色素株式会社製）
黒染料（御国色素株式会社製）
蛍光染料：ｃａｎｗｈｉｔｅ（カナジアジャパン社製）
<Materials>
The following was used.
(1) Heavy calcium carbonate manufactured by Fimatec Co., Ltd., product name: FMT97, D50 = 0.88 μm
Manufactured by Fimatec Co., Ltd., product name: FMT75, D50 = 1.65 μm
Manufactured by Fimatec Co., Ltd., product name: Carbital 90, D50 = 1.22 μm
Manufactured by Fimatec Co., Ltd., product name: FMT100YF, D50=0.59μm
Manufactured by Fimatec Co., Ltd., product name: FMT100, D50=0.65μm
Manufactured by Imerys Minerals Japan Co., Ltd., product name: Carbital 97, D50 = 0.88 μm
(2) Clay Made by Kamin, Hydragloss D50=0.22μm
Made by Imerys Minerals Japan, Premier, D50=2.055μm
(3) Adhesive Styrene-butadiene copolymer latex Starch:
Dynacoat 68NB (manufactured by GSL Japan Co., Ltd.)
Biolatex (manufactured by Ecosynthetix)
(4) Dye Purple dye (manufactured by Mikuni Shiki Co., Ltd.)
Blue dye (manufactured by Mikuni Shiki Co., Ltd.)
Black dye (manufactured by Mikuni Shiki Co., Ltd.)
Fluorescent dye: canwhite (manufactured by Canada Japan)
＜シリーズ３＞
［実施例１］
化学パルプ１００重量％を用い、填料として軽質炭酸カルシウムを１３．５重量％含有する坪量７５ｇ／ｍ2の原紙を準備した。
<Series 3>
[Example 1]
A base paper with a basis weight of 75 g/m 2 was prepared using 100% by weight of chemical pulp and containing 13.5% by weight of light calcium carbonate as a filler.
顔料として重質炭酸カルシウム（株式会社ファイマテック製、商品名：ＦＭＴ９７、Ｄ５０＝０．８８μｍ）１００重量部を用い、これに接着剤としてスチレン・ブタジエン系共重合ラテックスを３重量部、酸化澱粉を６重量部配合して、さらに水を加えて固形分濃度６５重量％の下塗り顔料塗工液を得た。 100 parts by weight of heavy calcium carbonate (manufactured by Fimatec Co., Ltd., product name: FMT97, D50 = 0.88 μm) was used as a pigment, 3 parts by weight of styrene-butadiene copolymer latex and oxidized starch were used as an adhesive. 6 parts by weight were added, and water was further added to obtain an undercoat pigment coating liquid with a solid content concentration of 65% by weight.
第１の炭酸カルシウムである微粒重質炭酸カルシウム（株式会社ファイマテック製、商品名：１００ＹＦ、Ｄ５０＝０．５９μｍ）１００重量部を用い、これに接着剤としてスチレン・ブタジエン系共重合ラテックスを７．７重量部、澱粉系バインダー「バイオラテックス」を１．３部（表中ＢＬｘと表記）、表１に示すとおりに各染料を配合して、さらに水を加えて固形分濃度６６重量％の上塗り顔料塗工液を得た。 Using 100 parts by weight of fine grained ground calcium carbonate (manufactured by Fimatec Co., Ltd., trade name: 100YF, D50=0.59 μm), which is the first calcium carbonate, 7 parts of styrene-butadiene copolymer latex was added as an adhesive. .7 parts by weight, 1.3 parts of starch-based binder "Biolatex" (denoted as BLx in the table), each dye as shown in Table 1, and water was added to obtain a solid content of 66% by weight. A top coat pigment coating solution was obtained.
前記原紙上に、下塗り顔料塗工液をブレードコーターで片面あたりの乾燥塗工量が９．５ｇ／ｍ2となるように両面塗工し乾燥した。さらに、その上に上塗り顔料塗工液をブレードコーターで片面あたりの乾燥塗工量が８．５ｇ／ｍ2となるように両面塗工し、樹脂ロールと金属ロールにてニップされ、温度とニップ線圧は表１に示す条件でカレンダー処理を行い、印刷用塗工紙を得た。当該印刷用塗工紙について、前述の方法にて評価した。 An undercoat pigment coating solution was applied onto both sides of the base paper using a blade coater so that the dry coating amount per side was 9.5 g/m 2 and dried. Furthermore, a top coat pigment coating liquid was applied on both sides using a blade coater so that the dry coating amount per side was 8.5g/ m2 , and the coating was nipped between a resin roll and a metal roll, and the temperature and nip were adjusted. Calendar treatment was performed under the linear pressure conditions shown in Table 1 to obtain coated paper for printing. The coated paper for printing was evaluated using the method described above.
［実施例２］
下塗り塗工液のラテックス量を変更した以外は実施例１と同様にして印刷用塗工紙を製造して評価した。
[Example 2]
Coated paper for printing was produced and evaluated in the same manner as in Example 1, except that the amount of latex in the undercoat coating liquid was changed.
［比較例１、２］
表１に示した塗工液を用いた以外は、実施例１と同様にして印刷用塗工紙を製造して評価した。
[Comparative Examples 1 and 2]
Coated paper for printing was produced and evaluated in the same manner as in Example 1, except that the coating liquid shown in Table 1 was used.
＜シリーズ１＞
［実施例３、４］
化学パルプ１００重量％を用い、填料として軽質炭酸カルシウムを１３．５重量％含有する坪量６９ｇ／ｍ2の原紙を準備した。
表１に示す顔料、接着剤を用いて固形分濃度６５重量％の下塗り顔料塗工液を得た。表１に示す顔料、接着剤を用いて固形分濃度６５重量％の上塗り顔料塗工液を得た。
これらを用いて、実施例１と同様に印刷用塗工紙を製造して評価した。
<Series 1>
[Examples 3 and 4]
A base paper with a basis weight of 69 g/m 2 was prepared using 100% by weight of chemical pulp and containing 13.5% by weight of light calcium carbonate as a filler.
An undercoat pigment coating liquid with a solid content concentration of 65% by weight was obtained using the pigments and adhesives shown in Table 1. Using the pigments and adhesives shown in Table 1, a top coat pigment coating liquid with a solid content concentration of 65% by weight was obtained.
Using these, coated paper for printing was manufactured and evaluated in the same manner as in Example 1.
［比較例３、４］
表１に示すとおりに上塗り塗工液を変更した以外は、実施例３と同様に印刷用塗工紙を製造して評価した。
[Comparative Examples 3 and 4]
Coated paper for printing was produced and evaluated in the same manner as in Example 3, except that the top coating liquid was changed as shown in Table 1.
＜シリーズ２＞
［実施例５～８］
化学パルプ１００重量％を用い、填料として軽質炭酸カルシウムを１３．５重量％含有し、澱粉サイズプレスされた坪量７５ｇ／ｍ2の原紙を準備した
表１に示す顔料、接着剤を用いて固形分濃度６５重量％の顔料塗工液を得た。
これらを用いて、実施例１と同様にして１層の顔料塗工層を備える印刷用塗工紙を製造して評価した。
<Series 2>
[Examples 5 to 8]
A base paper with a basis weight of 75 g/m 2 was prepared using 100% by weight of chemical pulp, containing 13.5% by weight of light calcium carbonate as a filler, and was pressed to a starch size. A pigment coating solution having a concentration of 65% by weight was obtained.
Using these, coated printing paper having one pigment coating layer was produced and evaluated in the same manner as in Example 1.
［比較例５］
表１に示すとおりに塗工液を変更した以外は、実施例５と同様に印刷用塗工紙を製造して評価した。
[Comparative example 5]
Coated paper for printing was produced and evaluated in the same manner as in Example 5, except that the coating liquid was changed as shown in Table 1.
シリーズ１の実施例３、４では、Ｄ５０が０．８０μｍ以下の炭酸カルシウムを用いることでクレーが配合される比較例４よりも印刷表面強度が向上し、バインダーを減配できる可能性が示唆された。また、実施例３、４では平均粒子径が大きい炭酸カルシウムを使用した比較例３と同カレンダー条件においても高い光沢度が得られた。 In Examples 3 and 4 of Series 1, by using calcium carbonate with a D50 of 0.80 μm or less, the printing surface strength was improved compared to Comparative Example 4 in which clay was blended, suggesting the possibility of reducing the amount of binder. . Further, in Examples 3 and 4, high gloss was obtained even under the same calendering conditions as in Comparative Example 3 using calcium carbonate having a large average particle diameter.
シリーズ２はシングル塗工を施した印刷用塗工紙に関する。Ｄ５０が０．８０μｍ以下の炭酸カルシウムを配合した実施例５～８では、シリーズ１（ダブル塗工）と同様に、平均粒子径が大きい炭酸カルシウムを使用した比較例５に比べて高い光沢度が得られた。また実施例８では、実施例５に比べてバインダーである澱粉を１重量部減配したが、印刷表面強度は印刷上問題無いレベルを保持し、両者に大差は見られなかった。 Series 2 concerns coated paper for printing with single coating. In Examples 5 to 8, in which calcium carbonate with a D50 of 0.80 μm or less was blended, similar to Series 1 (double coating), the gloss was higher than in Comparative Example 5, which used calcium carbonate with a large average particle size. Obtained. Further, in Example 8, the amount of starch as a binder was reduced by 1 part by weight compared to Example 5, but the printing surface strength was maintained at a level that caused no problems in printing, and no major difference was observed between the two.
シリーズ３より、Ｄ５０が０．８０μｍ以下の炭酸カルシウムを使用することで、クレーまたはカオリンを使用した場合と比較して、同等の白紙光沢度でありながら、強度を向上でき、接着剤の量を減らしても同等強度の印刷用塗工紙を得ることができたことが明らかである。以上より、本発明の印刷用塗工紙は、白紙光沢度が高く、かつ強度に優れることが明らかである。 From Series 3, by using calcium carbonate with a D50 of 0.80 μm or less, compared to using clay or kaolin, it is possible to improve strength while maintaining the same white paper gloss, and to reduce the amount of adhesive. It is clear that a coated printing paper with the same strength could be obtained even if the amount was reduced. From the above, it is clear that the coated paper for printing of the present invention has high white paper gloss and excellent strength.
Claims (7)
最外顔料塗層が０．５０μｍより大きく０．８０μｍ以下の平均粒子径（Ｄ５０）を有する炭酸カルシウムを含み、
白紙光沢度（７５°）が６０％以上である、印刷用塗工紙。 A pigment coating layer is provided on at least one side of the base paper,
The outermost pigment coating layer contains calcium carbonate having an average particle diameter (D50) of more than 0.50 μm and less than 0.80 μm,
A coated paper for printing that has a white paper glossiness (75°) of 60% or more.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018119319 | 2018-06-22 | ||
| JP2018119319 | 2018-06-22 | ||
| JP2020525791A JPWO2019244970A1 (en) | 2018-06-22 | 2019-06-20 | Coated paper for printing |
| PCT/JP2019/024451 WO2019244970A1 (en) | 2018-06-22 | 2019-06-20 | Coated printing paper |
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| Application Number | Title | Priority Date | Filing Date |
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| JP2020525791A Division JPWO2019244970A1 (en) | 2018-06-22 | 2019-06-20 | Coated paper for printing |
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| JP2020525791A Pending JPWO2019244970A1 (en) | 2018-06-22 | 2019-06-20 | Coated paper for printing |
| JP2023197461A Pending JP2024026131A (en) | 2018-06-22 | 2023-11-21 | coated paper for printing |
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| Application Number | Title | Priority Date | Filing Date |
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| JP2020525791A Pending JPWO2019244970A1 (en) | 2018-06-22 | 2019-06-20 | Coated paper for printing |
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| JP (2) | JPWO2019244970A1 (en) |
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| JP4449820B2 (en) * | 2004-07-02 | 2010-04-14 | 王子製紙株式会社 | Coated paper for printing |
| WO2012133092A1 (en) * | 2011-03-30 | 2012-10-04 | 日本製紙株式会社 | Coated white board and manufacturing method thereof |
| JP2012224535A (en) * | 2011-04-08 | 2012-11-15 | Oji Holdings Corp | Light calcium carbonate-containing slurry for coating, and coated paper using the same |
| JP5810888B2 (en) * | 2011-12-20 | 2015-11-11 | 王子ホールディングス株式会社 | Method for producing coated paper for printing |
| SI2949477T1 (en) * | 2014-05-26 | 2017-03-31 | Omya International Ag | Calcium carbonate for rotogravure printing medium |
| JP2016017015A (en) * | 2014-07-09 | 2016-02-01 | 奥多摩工業株式会社 | Calcium carbonate slurry, and coating liquid and coated product using the same |
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