Coating paper for printing
A technology of coating paper and coating layer, applied in papermaking, coating, paper coating, etc., can solve the problems of difficult to prevent offset rotary wrinkles, scratches on the printing surface, and lowering the drying temperature of the printing press at the same time.
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Embodiment 1
[0088] (manufacture of coated base paper)
[0089] Prepare the pulp liquid composed of 70 parts of LBKP (water drainage 400ml / csf) and 30 parts of NBKP (water drainage 480ml / csf), add light calcium carbonate as a filler to make the paper ash content 6.5%, and then compare the pulp solid content Add 0.1% of AKD sizing agent (trade name: サイズパイン K-902 / Arakawa Chemical) and 0.5% of aluminum sulfate as an internal sizing agent to make paper, and then continue to use pregelatinized oxidized starch ( Product name: エススA / manufactured by Oji Konstaichi) Glue and press with a double-roller glue press (the amount of oxidized starch on both sides is 1.0g / m2) 2 ) to prepare the base paper.
[0090]In addition, polyacrylic acid (trade name: Hibiswako-105 / Wako Pure Chemical Industries, Ltd.) was mixed with methylcellulose (trade name: HISOTROS 60SH4000 / Shin-Etsu Chemical Industry Co., Ltd.) in a ratio of 3 parts (solid content comparison) to prepare a PVA-based resin composition. Disperse...
Embodiment 2
[0097] In the aqueous liquid of the PVA-based resin composition used in the production of the coated base paper of Example 1, the ratio of 60 parts to 100 parts of the PVA-based resin composition (solid content ratio) was mixed with pregas to form an aqueous dispersion. Ground calcium carbonate (trade name: FMT90 / manufactured by Faimatec) with an average particle diameter of 0.6 μm was prepared to prepare an aqueous liquid having a concentration of 21% mainly composed of a PVA-based resin composition and ground calcium carbonate. In addition to coating the obtained aqueous solution on the base paper so that the coating amount after drying is 2.7g / m2 per side 2 A coated paper for printing was obtained in the same manner as in Example 1 except that the coated base paper was obtained.
[0098] Evaluate the moisture permeability M of base paper and coated paper 65 , Moisture permeability M 100 , Offset rotation wrinkles, air bubbles, ink drying state and creases of coated paper....
Embodiment 3
[0100] In the aqueous solution of the PVA-based resin composition used in the manufacture of the coated base paper of Example 1, the average particle size of the aqueous dispersion in advance was mixed in a ratio of 150 parts (solid content ratio) to 100 parts of the PVA-based resin composition. Ground calcium carbonate (trade name: FMT90 / manufactured by Faimatec) with a diameter of 0.6 μm was used to prepare an aqueous liquid having a concentration of 28% mainly composed of a PVA-based resin composition and ground calcium carbonate. In addition to coating the obtained aqueous solution on the base paper so that the coating amount after drying is 3.0g / m2 per side 2 A coated paper for printing was obtained in the same manner as in Example 1 except that the coated base paper was obtained.
[0101] Evaluate the moisture permeability M of base paper and coated paper 65 , Moisture permeability M 100 , Offset rotation wrinkles, air bubbles, ink drying state and creases of coated pa...
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