JPH01221595A - Production of cast-coated paper - Google Patents
Production of cast-coated paperInfo
- Publication number
- JPH01221595A JPH01221595A JP4462488A JP4462488A JPH01221595A JP H01221595 A JPH01221595 A JP H01221595A JP 4462488 A JP4462488 A JP 4462488A JP 4462488 A JP4462488 A JP 4462488A JP H01221595 A JPH01221595 A JP H01221595A
- Authority
- JP
- Japan
- Prior art keywords
- cast
- coating layer
- coated paper
- cast coating
- salt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 239000011247 coating layer Substances 0.000 claims abstract description 54
- 238000000034 method Methods 0.000 claims abstract description 30
- 239000000049 pigment Substances 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000001035 drying Methods 0.000 claims abstract description 14
- 239000010410 layer Substances 0.000 claims abstract description 11
- 150000003839 salts Chemical class 0.000 claims abstract description 9
- 239000000853 adhesive Substances 0.000 claims abstract description 8
- 230000001070 adhesive effect Effects 0.000 claims abstract description 8
- 239000007864 aqueous solution Substances 0.000 claims abstract description 7
- 150000003751 zinc Chemical class 0.000 claims abstract description 4
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims abstract description 3
- 159000000007 calcium salts Chemical class 0.000 claims abstract description 3
- 229910052751 metal Inorganic materials 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 13
- 239000003973 paint Substances 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 abstract description 19
- 238000000576 coating method Methods 0.000 abstract description 19
- 230000008569 process Effects 0.000 abstract description 3
- -1 zinc salt Chemical class 0.000 abstract description 3
- 229910052725 zinc Inorganic materials 0.000 abstract description 2
- 239000011701 zinc Substances 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 33
- 230000015271 coagulation Effects 0.000 description 11
- 238000005345 coagulation Methods 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 239000000203 mixture Substances 0.000 description 6
- 238000005266 casting Methods 0.000 description 5
- 239000004816 latex Substances 0.000 description 5
- 229920000126 latex Polymers 0.000 description 5
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 5
- 229960001763 zinc sulfate Drugs 0.000 description 5
- 229910000368 zinc sulfate Inorganic materials 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 239000000701 coagulant Substances 0.000 description 4
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 238000002203 pretreatment Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 238000009472 formulation Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 235000012211 aluminium silicate Nutrition 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
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 2
- 239000005018 casein Substances 0.000 description 2
- 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 2
- 235000021240 caseins Nutrition 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 235000019253 formic acid Nutrition 0.000 description 2
- 230000006872 improvement Effects 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
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 description 2
- 239000006082 mold release agent Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 2
- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Chemical compound [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 description 2
- CBOCVOKPQGJKKJ-UHFFFAOYSA-L Calcium formate Chemical compound [Ca+2].[O-]C=O.[O-]C=O CBOCVOKPQGJKKJ-UHFFFAOYSA-L 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229920000881 Modified starch Polymers 0.000 description 1
- 239000004368 Modified starch Substances 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 108010073771 Soybean Proteins Proteins 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- ZOIORXHNWRGPMV-UHFFFAOYSA-N acetic acid;zinc Chemical compound [Zn].CC(O)=O.CC(O)=O ZOIORXHNWRGPMV-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- KLIYQWXIWMRMGR-UHFFFAOYSA-N buta-1,3-diene;methyl 2-methylprop-2-enoate Chemical compound C=CC=C.COC(=O)C(C)=C KLIYQWXIWMRMGR-UHFFFAOYSA-N 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
- VSGNNIFQASZAOI-UHFFFAOYSA-L calcium acetate Chemical compound [Ca+2].CC([O-])=O.CC([O-])=O VSGNNIFQASZAOI-UHFFFAOYSA-L 0.000 description 1
- 239000001639 calcium acetate Substances 0.000 description 1
- 235000011092 calcium acetate Nutrition 0.000 description 1
- 229960005147 calcium acetate Drugs 0.000 description 1
- 239000004281 calcium formate Substances 0.000 description 1
- 229940044172 calcium formate Drugs 0.000 description 1
- 235000019255 calcium formate Nutrition 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 235000013539 calcium stearate Nutrition 0.000 description 1
- 239000008116 calcium stearate Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- UEGPKNKPLBYCNK-UHFFFAOYSA-L magnesium acetate Chemical compound [Mg+2].CC([O-])=O.CC([O-])=O UEGPKNKPLBYCNK-UHFFFAOYSA-L 0.000 description 1
- 239000011654 magnesium acetate Substances 0.000 description 1
- 235000011285 magnesium acetate Nutrition 0.000 description 1
- 229940069446 magnesium acetate Drugs 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 235000019426 modified starch Nutrition 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000001254 oxidized starch Substances 0.000 description 1
- 235000013808 oxidized starch Nutrition 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 235000019710 soybean protein Nutrition 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000004246 zinc acetate Substances 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
- SRWMQSFFRFWREA-UHFFFAOYSA-M zinc formate Chemical compound [Zn+2].[O-]C=O SRWMQSFFRFWREA-UHFFFAOYSA-M 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
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/64—Inorganic compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Paper (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、キャストコート紙の製造法に関するものであ
る。特に、キャストコート紙特有の高光沢性その他の品
質を損なうことなく、しかもピンホールの解消されたキ
ャストコート紙の製造法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for producing cast coated paper. In particular, the present invention relates to a method for producing cast coated paper that eliminates pinholes without impairing the high gloss and other qualities characteristic of cast coated paper.
キャストコート紙は、その表面の高光沢性、高平滑性等
により印刷の再現性が極めて優れ、精密な高級印刷用に
供され、美術印刷物、高級カタログ、雑誌の表紙、ラベ
ル、包装紙等に広く使用されている。Cast coated paper has extremely high print reproducibility due to its high gloss and smooth surface, and is used for precise high-end printing, and is used for fine art prints, high-end catalogs, magazine covers, labels, wrapping paper, etc. Widely used.
キャストコート紙は、原紙の表面に、顔料および接着剤
を主成分とする水性顔料塗料を塗被してキャスト塗被層
を設け、続いてキャスト塗被層を加熱された金属製の鏡
面ドラムに圧着、乾燥することにより製造されている。Cast-coated paper is made by coating the surface of base paper with a water-based pigment coating mainly composed of pigments and adhesives to form a cast coating layer, and then applying the cast coating layer to a heated metal mirror drum. Manufactured by pressing and drying.
このキャストコート紙の製造法は、キャスト塗被層を加
熱された金属製の鏡面ドラムに圧着、乾燥してキャスト
コート層を得る光沢仕上げを行なう処理方法によって、
ウェット法（直接法）、凝固法（ゲル化法）およびリウ
ェツト法（間接法）とに大別される。The method for producing cast coated paper involves pressing the cast coating layer onto a heated metal mirror drum and drying it to obtain a glossy finish.
It is broadly divided into wet method (direct method), coagulation method (gelling method) and rewetting method (indirect method).
すなわち、キャスト塗被層が、ウェット状態にあるうち
に加熱された金属製の鏡面ドラムに圧着、乾燥して光沢
仕上げするのがウェット法である。That is, in the wet method, the cast coating layer is pressed onto a heated metal mirror drum while it is in a wet state, and then dried to give a glossy finish.
また、ウェット状態にあるキャスト塗被層を凝固洛中に
通してゲル化状態にした後、加熱された金属製の鏡面ド
ラムに圧着、乾燥して光沢仕上げするのが凝固法である
。そして、ウェット状態にあるキャスト塗被層を一旦乾
燥した後、そのままもしくはスーパーキャレンダー処理
後湿潤液でキャスト塗被層を再湿潤し可塑状態にしてか
ら加熱された金属製の鏡面ドラムに圧着して光沢仕上げ
するのがリウェツト法である。In addition, the coagulation method involves passing the wet cast coating layer through a coagulation system to gel it, then pressing it onto a heated metal mirror drum and drying it to give it a glossy finish. After drying the wet cast coating layer, the cast coating layer is re-wetted with a wetting liquid either as it is or after being treated with a super calender to make it plastic, and then it is pressed onto a heated metal mirror drum. The rewetting method produces a glossy finish.
キャストコート紙のこれらの製造法は、いずれもキャス
ト塗被層が、湿潤または可塑状態にあるうちに鏡面ドラ
ムに圧着、乾燥するものである。In all of these methods for producing cast-coated paper, the cast coating layer is pressed onto a specular drum while it is in a wet or plastic state and dried.
このため、キャスト塗被層の水分は、原紙層を通して蒸
発する。一方、キャスト塗被層の水分の一部は、キャス
ト塗被層を通して鏡面ドラム方向に向って蒸発する。蒸
発速度が、ある限度を越えて高くなると、得られるキャ
ストコート層面にピンホールが発生し、製品として印刷
に供することが出来ず、生産性を低下させる原因となる
。Therefore, the water in the cast coating layer evaporates through the base paper layer. On the other hand, part of the water in the cast coating layer evaporates toward the specular drum through the cast coating layer. If the evaporation rate increases beyond a certain limit, pinholes will occur on the surface of the resulting cast coat layer, making it impossible to print as a product and causing a decrease in productivity.
このような現象は、蒸発水分量が比較的多いウェット法
において顕著であり、このような理由からキャストコー
ト紙製造の高速化は、リウェツト法に向いている。Such a phenomenon is noticeable in the wet method in which the amount of evaporated water is relatively large, and for this reason, the rewetting method is suitable for increasing the speed of producing cast coated paper.
しかし、一方、リウェツト法は、他のウェット法および
ゲル化法に比較して、キャスト塗被層の可塑性が低い欠
点がある。そのためにリウェツト法では、キャスト塗被
層用の水性顔料塗料配合、再湿潤液の選定あるいは作業
速度、鏡面ドラムの温度、鏡面ドラムへのプレス圧等の
作業条件の選定が重要であり、選定を誤るとキャストコ
ート層表面のピンホール、密着ムラ等のいわゆるキャス
ト面の不良が発生し易くなる欠点がある。However, on the other hand, the rewetting method has the disadvantage that the plasticity of the cast coating layer is low compared to other wet methods and gelling methods. Therefore, in the rewetting method, it is important to select the water-based pigment paint formulation for the cast coating layer, the selection of the rewetting liquid, and the selection of working conditions such as work speed, temperature of the mirror drum, and press pressure on the mirror drum. If incorrectly applied, there is a drawback that so-called casting surface defects such as pinholes and uneven adhesion on the surface of the cast coating layer are likely to occur.
これに対して、凝固法は、塗被層を凝固液処理によって
ゲル化するもので、比較的高温のキャストドラム処理が
可能であるが、−ｍに乾燥を伴わないため、キャストド
ラムでの乾燥負荷はりウェット法より高く、あるいは凝
固処理がキャスト直前で行われるなめ充分な凝固作用が
得られず、凝固剤により光沢低下の懸念もある。凝固剤
を予め水性顔料塗料中に添加する方法も、それぞれの方
法について実施されているが、この場合は、水性顔料塗
料の粘性が変動しやすく、安定した塗工が困難なことが
多く、また充分な凝固効果も期待しにくい。On the other hand, in the coagulation method, the coating layer is gelled by treatment with a coagulation liquid, and can be treated with a cast drum at a relatively high temperature. Since the load is higher than that of the wet method, or the coagulation process is performed immediately before casting, a sufficient coagulation effect cannot be obtained, and there is also a concern that the coagulant may reduce gloss. Various methods have been implemented in which a coagulant is added to the water-based pigment paint in advance, but in this case, the viscosity of the water-based pigment paint tends to fluctuate, making stable coating difficult. It is also difficult to expect a sufficient coagulation effect.
本発明者らは、各種キャスト法のこれらの欠点を解消す
るために鋭意検討した結果、湿潤あるいは半乾燥状態の
キャスト塗被層を特定の金属塩水溶液で処理し、更に、
これを乾燥、再湿潤処理したのち加熱された鏡ドラムに
圧着、乾燥することにより問題を解決することに成功し
、本発明を完成させた。The inventors of the present invention have conducted intensive studies to solve these drawbacks of various casting methods, and as a result, the cast coating layer in a wet or semi-dry state is treated with a specific metal salt aqueous solution, and further,
After drying and re-wetting this material, it was pressed onto a heated mirror drum and dried, thereby successfully solving the problem and completing the present invention.
すなわち、本発明は、原紙の表面に、顔料および接着剤
を主成分とする水性顔料塗料を塗被しキャスト塗被層を
設け、次いで、該キャスト塗被層を加熱された金属製の
鏡面ドラムに圧着、乾燥してキャストコート層を設けて
なるキャストコート紙の製造法において、キャスト塗被
層が湿潤状態または半乾燥状態にある間に、亜鉛塩、カ
ルシウム塩、アルミニウム塩等の金属塩の水溶液で前処
理し、次いで、乾燥、再湿潤することを特徴とするキャ
ストコート紙の製造法である。That is, the present invention provides a cast coating layer by coating the surface of a base paper with a water-based pigment paint containing pigment and adhesive as main components, and then applying the cast coating layer to a heated metal mirror drum. In the manufacturing method of cast coated paper, in which a cast coat layer is formed by pressing and drying, metal salts such as zinc salts, calcium salts, aluminum salts, etc. are added to the cast coat layer while it is in a wet or semi-dry state. This is a method for producing cast coated paper, which is characterized by pretreatment with an aqueous solution, followed by drying and rewetting.
キャストコート紙のピンホールの生成原因は、種々考え
られるが、急激な水分の蒸発によってキャスト塗被層が
破壊されピンホールやブリスターが起きることが知られ
ている。蟻酸や蟻酸カルシウムによってキャスト塗被層
を凝固処理すると、高温のキャストドラムに接触させて
もキャスト塗被層の破壊が起き難くなり、従って高速化
を計れることも良く知られている。しかし、単にキャス
ト塗被層の凝固処理を行うかあるいは水性顔料塗料中に
凝固剤を添加するだけでは粘性、光沢等の問題が生ずる
ことは既に述べた通りである。原紙の透気性を高めたり
、顔料やラテックス配合の改良により、キャスト塗被層
の透気性を改良することも実施されているが、改善の程
度には限界があり、また水性顔料塗料配合の大幅な変更
は塗料の粘性、キャストコート紙の品質等に悪影響を及
ぼことも多く、充分満足出来る結果は得られていない。There are various possible causes for the formation of pinholes in cast coated paper, but it is known that rapid evaporation of water destroys the cast coating layer, causing pinholes and blisters. It is also well known that if the cast coating layer is coagulated with formic acid or calcium formate, the cast coating layer will be less likely to be destroyed even if it comes into contact with a high-temperature casting drum, and therefore speeds can be increased. However, as already mentioned, problems such as viscosity and gloss arise if the cast coating layer is simply coagulated or a coagulant is added to the water-based pigment coating. Efforts have been made to improve the air permeability of the cast coating layer by increasing the air permeability of the base paper or by improving the pigment and latex formulations, but there are limits to the degree of improvement, and there are significant changes in the formulation of water-based pigment paints. Such changes often have an adverse effect on the viscosity of the paint, the quality of the cast-coated paper, etc., and fully satisfactory results have not been obtained.
本発明者らは、高い品質とりわけピンホールを生成せず
、かつ生産性の高いキャストコート紙の製法について種
々検討した結果、キャスト塗被層が湿潤または半乾燥状
態にある間に、特定の金属塩の水溶液で処理した後、乾
燥、更にリウェツト処理することにより目的を達成出来
ることを見出した。The inventors of the present invention have investigated various methods for manufacturing cast-coated paper that is high in quality, does not produce pinholes, and has high productivity. It has been found that the object can be achieved by treating with an aqueous salt solution, followed by drying and rewetting.
本発明では、金属塩による凝固処理がキャスト塗被層上
で行われるため、塗工時の塗料の粘性変動は起きず、ま
た凝固処理後の加熱乾燥によって凝固作用が促進確実化
されるため、少量の凝固剤で目的を達成することが出来
る。更に、乾燥後再湿潤処理を伴うことにより、リウェ
ツト法のメリットである高い光沢も得られる。In the present invention, since the coagulation treatment with the metal salt is performed on the cast coating layer, the viscosity of the paint does not change during coating, and the coagulation effect is promoted and ensured by heating and drying after the coagulation treatment. The purpose can be achieved with a small amount of coagulant. Furthermore, by performing a rewetting process after drying, high gloss, which is an advantage of the rewetting method, can also be obtained.
この改善効果は、紙塗工用の一般的な水性顔料塗料であ
れば大差なく、キャストコート紙の品質物性の劣化も認
められない特徴がある。このようにキャスト塗被層を予
め前処理してからりウェット法で光沢仕上げをすると、
ピンホール、密着ムラが大幅に改善されたキャストコー
ト紙を得ることが出来、しかもキャストコート作業速度
の増速か出来た。This improvement effect is not much different from ordinary water-based pigment paints for paper coating, and there is no noticeable deterioration in the quality and physical properties of cast coated paper. If you pre-treat the cast coating layer in this way and give it a glossy finish using the Karari wet method,
It was possible to obtain cast-coated paper with significantly improved pinholes and uneven adhesion, and also to increase the cast-coating work speed.
このようなキャストコート紙特有の高光沢性その他の品
質を損なうことなく、しかもピンホールの解消されたキ
ャストコート紙が得られる本発明のキャストコート紙の
製造法について詳述する。The method for producing cast-coated paper of the present invention, which can obtain cast-coated paper free of pinholes without impairing the high gloss and other qualities characteristic of cast-coated paper, will be described in detail.
先ず、原紙の表面に、キャスト塗被層を設けるにあたり
、調製される水性顔料塗料は、紙の水性顔料コーティン
グに通常供されているものでよい。First, in providing a cast coating layer on the surface of base paper, the water-based pigment paint to be prepared may be one that is commonly used for water-based pigment coating of paper.
従って、顔料としては、クレー、カオリン、水酸化アル
ミニウム、炭酸カルシウム、酸化チタン、硫酸バリウム
、サテンホワイト、各種プラスチックピグメント等が用
いられる。また、接着剤としては、 スチレン−ブタジ
ェンラテックス 、 メチルメタアクリレート−ブタジ
ェンラテックス等の合成樹脂ラテックスおよびカゼイン
、大豆蛋白、酸化デンプン、変性デンプン、ポリビニル
アルコール等の水溶性接着剤等が用いられる。これらの
接着剤は、顔料１００重量部に対して合計で１５〜３０
重量部の範囲で配合される。そして、水性顔料塗料の調
製にあたり添加剤として離型剤、消泡剤、着色剤、粘性
改良剤、耐水化剤等も必要に応じて配合することが出来
る。Therefore, as pigments, clay, kaolin, aluminum hydroxide, calcium carbonate, titanium oxide, barium sulfate, satin white, various plastic pigments, etc. are used. As the adhesive, synthetic resin latex such as styrene-butadiene latex and methyl methacrylate-butadiene latex, and water-soluble adhesives such as casein, soybean protein, oxidized starch, modified starch, and polyvinyl alcohol are used. These adhesives are used in a total amount of 15 to 30 parts by weight per 100 parts by weight of pigment.
It is blended within the range of parts by weight. In preparing the water-based pigment paint, additives such as a mold release agent, antifoaming agent, coloring agent, viscosity improver, and water resistance agent can be added as necessary.
顔料および接着剤とを主成分とし、必要に応じて添加剤
を配合して調製された固型分濃度４０〜７０％の水性顔
料塗料は、エアーナイフコーター、 ブレードコーター
、 トルコーター 、 Ｕラドコーター 等で坪量４０
〜３５０ｇｒ ／ ｍ”の原紙の表面に、塗被量が５
〜３０ｇｒ／ｍ２になるように塗被されキャスト塗被層
は設けられる。Water-based pigment paints with a solid content concentration of 40 to 70%, which are prepared using pigments and adhesives as main components, and additives as necessary, can be coated with air knife coaters, blade coaters, Torque coaters, U-Rad coaters, etc. Basis weight 40
~350gr/m” base paper surface with a coating weight of 5
A cast coating layer is provided to provide a coating of ~30 gr/m2.
次いで、かくして原紙の表面に設けられたキャスト塗被
層は、そのまま引き続き湿潤状態で、もしくは赤外線ヒ
ーターあるいは熱風乾燥機等により半乾燥状態にした後
、特定の金属塩の水溶液で予め前処理し、その後乾燥仕
上げをする。Next, the cast coating layer thus provided on the surface of the base paper is kept in a wet state or made semi-dry using an infrared heater or hot air dryer, and then pretreated with an aqueous solution of a specific metal salt. Then give it a dry finish.
本発明において使用される特定の金属塩としては、亜鉛
、アルミニウム、カルシウム等の硝酸、硫酸、蟻酸、酢
酸、炭酸塩等が用いられる。これらのなかでは、亜鉛塩
が卓効を示し最も効果的である。As the specific metal salt used in the present invention, nitric acid, sulfuric acid, formic acid, acetic acid, carbonate, etc. of zinc, aluminum, calcium, etc. are used. Among these, zinc salts are the most effective.
これらの塩を用いてキャスト塗被紙を前処理するには、
０．２〜１０％濃度の処理液を調製して用いる。処理液
の濃度が低すぎると通気性に対する効果が不足し、また
高すぎると得られるキャストコート紙の表面強度が劣化
し好ましくない。To pre-treat cast-coated paper with these salts,
A treatment solution having a concentration of 0.2 to 10% is prepared and used. If the concentration of the treatment liquid is too low, the effect on air permeability will be insufficient, and if it is too high, the surface strength of the resulting cast coated paper will deteriorate, which is not preferable.
かくして調製された処理液でキャスト塗被層を処理する
には、スプレー噴霧、ロールコーティング、グイコーテ
ィング等で適用すればよい。処理液量は、３〜２０ｇｒ
／ｒｔ？で調整することが望ましい。To treat the cast coating layer with the treatment liquid thus prepared, it may be applied by spraying, roll coating, goo coating, or the like. The amount of processing liquid is 3~20gr
/rt? It is desirable to adjust with
このような処理液で前処理されたキャスト塗被紙は、−
旦乾燥後キヤストコーティングで通常実施されているリ
ウェツト法に則ってキャスト光沢仕上げすることにより
、高光沢性その他の品質を損なうことなく、しかもピン
ホールの解消されたキャストコート層を高速度で製造す
ることが出来る。再湿潤液としては、特に限定されない
が、水、水と離型剤との混合液、可塑化促進剤の水溶液
等が適宜使用される。Cast coated paper pretreated with such a treatment solution has -
After drying, a cast gloss finish is applied in accordance with the rewetting method commonly used in cast coating, thereby producing a cast coat layer with no pinholes at high speed without sacrificing high gloss or other qualities. I can do it. The rewetting liquid is not particularly limited, but water, a mixture of water and a mold release agent, an aqueous solution of a plasticization accelerator, and the like can be used as appropriate.
さらに、実施例によって本発明を説明する。 Further, the present invention will be explained by examples.
実施例１
キャスト塗被層配合組成 重量部カオリン
７０軽質炭酸カルシウム
３０ポリアクリル酸ソーダ ０．７カ
ゼイン １０スチレン−フタジ
エンラテックス １
５ステアリン酸カルシウム ０．５上記キャス
ト塗被層配合組成で固型分６４％の水性顔料塗料を調製
し、坪量８５ｇｒ／ｍ２の原紙に乾燥重量が２０ｇｒ／
ｒｒ？になるように塗被してキャスト塗被層を設けた。Example 1 Cast coating layer composition Part by weight kaolin
70 light calcium carbonate
30 Sodium polyacrylate 0.7 Casein 10 Styrene-phtadiene latex 1
5 Calcium stearate 0.5 A water-based pigment coating with a solid content of 64% was prepared using the above cast coating layer composition, and a dry weight of 20 gr/m2 was applied to a base paper with a basis weight of 85 gr/m2.
rr? A cast coating layer was provided by coating the film so that the cast coating layer was formed.
次いで、キャスト塗被層が湿潤状態にあるうちに、硫
酸亜鉛２ｗｔ％の処理液をスプレィノズルを使用し、処
理ムラのないように液量１５ｇｒ／ｍ”塗被し、熱風ド
ライヤーで乾燥した。Next, while the cast coating layer was in a wet state, a treatment solution containing 2 wt % zinc sulfate was applied using a spray nozzle in an amount of 15 g/m'' to ensure uniform treatment, and then dried with a hot air dryer.
続いて、処理液で前処理したキャスト塗被紙をポリエチ
レンエマルジョン１％液で再湿潤後、クロムメツキドラ
ムの表面温度１１０℃、プレスニップ圧５０ｋｇ／ｃｍ
、紙速７０ｍ／分の条件でキャスト乾燥し、本発明によ
るキャストコート紙を得た。Subsequently, the cast coated paper pretreated with the treatment liquid was re-wetted with a 1% polyethylene emulsion, and the surface temperature of the chrome plating drum was 110°C and the press nip pressure was 50kg/cm.
The coated paper according to the present invention was obtained by casting and drying at a paper speed of 70 m/min.
実施例２
キャスト塗被層の前処理液として、硝酸亜鉛２ｗｔ％の
処理液を用いた以外は、実施例１と同様にして本発明に
よるキャストコート紙を得た。Example 2 A cast coated paper according to the present invention was obtained in the same manner as in Example 1, except that a treatment liquid containing 2 wt % zinc nitrate was used as a pretreatment liquid for the cast coating layer.
実施例３
キャスト塗被層の前処理液として、酢酸亜鉛２ｗｔ％の
処理液を用いた以外は、実施例１と同様にして本発明に
よるキャストコート紙を得た。Example 3 A cast coated paper according to the present invention was obtained in the same manner as in Example 1, except that a treatment liquid containing 2 wt % zinc acetate was used as a pretreatment liquid for the cast coating layer.
実施例４
キャスト塗被層の前処理液として、蟻酸亜鉛２ｗｔ％の
処理液を用いた以外は、実施例１と同様にして本発明に
よるキャストコート紙を得た。Example 4 Cast coated paper according to the present invention was obtained in the same manner as in Example 1, except that a treatment liquid containing 2 wt % zinc formate was used as a pretreatment liquid for the cast coating layer.
実施例５
キャスト塗被層の前処理液として、塩化亜鉛２ｗｔ％の
処理液を用いた以外は、実施例１と同様にして本発明に
よるキャストコート紙を得た。Example 5 Cast coated paper according to the present invention was obtained in the same manner as in Example 1, except that a treatment liquid containing 2 wt % zinc chloride was used as a pretreatment liquid for the cast coating layer.
実施例６
キャスト塗被層の前処理液として、硝酸カルシウム２ｗ
ｔ％の処理液を用いた以外は、実施例１と同様にして本
発明によるキャストコート紙を得た。Example 6 Calcium nitrate 2w as pre-treatment liquid for cast coating layer
A cast coated paper according to the present invention was obtained in the same manner as in Example 1, except that t% of the treatment liquid was used.
実施例７
キャスト塗被層の前処理液として、酢酸カルシウム２ｗ
ｔ％の処理液を用いた以外は、実施例１と同様にして本
発明によるキャストコート紙を得た。Example 7 Calcium acetate 2w as pre-treatment liquid for cast coating layer
A cast coated paper according to the present invention was obtained in the same manner as in Example 1, except that t% of the treatment liquid was used.
実施例８
キャスト塗被層の前処理液として、！１ｉＰｉカルシウ
ム２ｗｔ％の処理液を用いた以外は、実施例１と同様に
して本発明によるキャストコート紙を得た。Example 8 As a pre-treatment liquid for cast coating layer! A cast coated paper according to the present invention was obtained in the same manner as in Example 1, except that a treatment solution containing 2 wt% of 1iPi calcium was used.
実施例９
キャスト塗被層の前処理液として、硫酸亜鉛５ｗｔ％の
処理液を用いた以外は、実施例１と同様にして本発明に
よるキャストコート紙を得た。Example 9 Cast coated paper according to the present invention was obtained in the same manner as in Example 1, except that a treatment liquid containing 5 wt % zinc sulfate was used as a pretreatment liquid for the cast coating layer.
実施例１０
キャスト塗被層の前処理液として、硫酸亜鉛８ｗｔ％の
処理液を用いた以外は、実施例１と同様にして本発明に
よるキャストコート紙を得た。Example 10 A cast coated paper according to the present invention was obtained in the same manner as in Example 1, except that a treatment liquid containing 8 wt % zinc sulfate was used as a pretreatment liquid for the cast coating layer.
比較例１
実施例１のキャスト塗被紙について前処理せずに実施例
１と同様にして従来法によるキャストコート紙を得た。Comparative Example 1 Cast-coated paper was obtained using the conventional method in the same manner as in Example 1 without pre-treating the cast-coated paper of Example 1.
比較例２
キャスト塗被層の前処理液として、硫酸亜鉛１５ｗｔ％
の処理液を用いた以外は、実施例１と同様にして比較用
のキャストコート紙を得た。Comparative Example 2 15 wt% zinc sulfate as pre-treatment liquid for cast coating layer
A comparative cast coated paper was obtained in the same manner as in Example 1, except that the treatment liquid was used.
比較例３
キャスト塗被層の前処理液として、硫酸亜鉛０．１ｗｔ
％の処理液を用いた以外は、実施例１と同様にして比較
用のキャストコート紙を得た。Comparative Example 3 0.1wt of zinc sulfate as pretreatment liquid for cast coating layer
A comparative cast-coated paper was obtained in the same manner as in Example 1, except that % of the treatment liquid was used.
比較例４
キャスト塗被層の前処理液として、酢酸マグネシウム２
ｗｔ％の処理液を用いた以外は、実施例１と同様にして
比較用のキャスＩ・コート紙を得た。Comparative Example 4 Magnesium acetate 2 was used as a pretreatment liquid for the cast coating layer.
A comparative Cath I coated paper was obtained in the same manner as in Example 1, except that wt% of the treatment liquid was used.
比較例５
キャスト塗被層の前処理液として、硝酸マグネシウム２
ｗｔ％の処理液を用いた以外は、実施例１と同様にして
比較用のキャストコート紙を得た。Comparative Example 5 Magnesium nitrate 2 was used as a pretreatment liquid for the cast coating layer.
A comparative cast-coated paper was obtained in the same manner as in Example 1, except that a wt % treatment liquid was used.
各実施例および比較例で得られたキャストコート紙につ
いて品質試験を行った。品質試験の結果は、洗去の通り
で、本発明のキャストコート紙は、白紙光沢その他の品
質には全く問題なく、ピンホールの発生が見られないキ
ャストコート紙が得られていることが判る。A quality test was conducted on the cast coated paper obtained in each Example and Comparative Example. The results of the quality test are as shown in the results of washing, and it can be seen that the cast-coated paper of the present invention has no problems with white paper gloss or other qualities, and the cast-coated paper is free from pinholes. .
ピンホール発生の評価
◎ ： 殆ど発生せず
○ ： 僅かに発生 使用には支障なし△ ： かなり
多く発生 使用不可
× ： 全面に発生 使用不可
××： 全面にひどく発生 使用不可ＲＩテスター表
面強度の評価
○ ： キャストコート層にピッキングが発生せず
Δ ： キャストコート層にピッキングが僅かに発生
× ： キャストコート層にピッキングが発生 表面強
度不足
品質試験結果
透気度： ＪＩＳ Ｐ−８１１７による（秒）光沢度：
ＪＩＳ Ｐ−８１４２による（％）〔発明の効果〕
本発明のりウェット法によるキャストコート紙の製造法
によると、得られるキャストコート紙は、キャストコー
ト紙特有の高光沢性その他の品質を損なうことなく、し
かもピンホールの解消されたキャストコート紙を効率的
に製造することが出来る。したがって、その効果は計り
しれないものがある。Evaluation of pinhole occurrence ◎: Hardly occurs ○: Slightly occurs No problem with use △: Occurs quite a lot Cannot be used ×: Occurs on the entire surface Cannot be used ××: Severely occurs on the entire surface Cannot be used Evaluation of RI tester surface strength ○: No picking occurs in the cast coat layer Δ: Slight picking occurs in the cast coat layer ×: Picking occurs in the cast coat layer Insufficient surface strength Quality test results Air permeability: (seconds) Gloss according to JIS P-8117 Every time:
According to JIS P-8142 (%) [Effect of the invention] According to the method for manufacturing cast coated paper using the glue wet method of the present invention, the obtained cast coated paper has high gloss and other qualities unique to cast coated paper. Moreover, it is possible to efficiently produce cast-coated paper free of pinholes. Therefore, its effects are immeasurable.
特許出願人 日本加工製紙株式会社 代 理 人 弁理士 福 村 敏 代 理 人 弁理士 瀬 戸 昭 夫Patent applicant: Nippon Kako Paper Co., Ltd. Representative Patent Attorney Satoshi Fukumura Representative Patent Attorney Akio Seto
Claims (1)
料塗料を塗被しキャスト塗被層を設け、次いで、該キャ
スト塗被層を加熱された金属製の鏡面ドラムに圧着、乾
燥してキャストコート層を設けてなるキャストコート紙
の製造法において、キャスト塗被層が湿潤状態または半
乾燥状態にある間に、亜鉛塩、カルシウム塩、アルミニ
ウム塩等の金属塩の水溶液で前処理し、次いで、乾燥、
再湿潤することを特徴とするキャストコート紙の製造法
。The surface of the base paper is coated with a water-based pigment paint mainly composed of pigments and adhesives to form a cast coating layer, and then the cast coating layer is pressed onto a heated metal mirror drum and dried. In a method for manufacturing cast coated paper provided with a cast coat layer, while the cast coat layer is in a wet or semi-dry state, pretreatment is performed with an aqueous solution of a metal salt such as a zinc salt, a calcium salt, or an aluminum salt, Next, drying
A method for producing cast-coated paper characterized by rewetting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4462488A JPH01221595A (en) | 1988-02-29 | 1988-02-29 | Production of cast-coated paper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4462488A JPH01221595A (en) | 1988-02-29 | 1988-02-29 | Production of cast-coated paper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01221595A true JPH01221595A (en) | 1989-09-05 |
Family
ID=12696584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4462488A Pending JPH01221595A (en) | 1988-02-29 | 1988-02-29 | Production of cast-coated paper |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01221595A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5125482A (en) * | 1974-08-28 | 1976-03-02 | Hitachi Ltd | |
| JPS56159395A (en) * | 1980-05-14 | 1981-12-08 | Sanyo Kokusaku Pulp Co | Production of pigment coated paper |
-
1988
- 1988-02-29 JP JP4462488A patent/JPH01221595A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5125482A (en) * | 1974-08-28 | 1976-03-02 | Hitachi Ltd | |
| JPS56159395A (en) * | 1980-05-14 | 1981-12-08 | Sanyo Kokusaku Pulp Co | Production of pigment coated paper |
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