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Coating paper for printing

A technology of coated paper and coating layer, applied in papermaking, coating, paper coating, etc., can solve problems such as easy to cause creases, reduce moisture content in coated paper, and difficult to prevent offset rotation wrinkles at the same time

Inactive Publication Date: 2007-12-12
OJI PAPER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the above-mentioned prior application is to be scraped, it is difficult to prevent the occurrence of offset wheel wrinkles and the generation of air bubbles at the same time.
[0011] Moreover, in order to prevent the occurrence of offset roto-wrinkling and the occurrence of air bubbles at the same time, if the moisture content of the coated paper is greatly reduced (for example, 3.5% or less), there will be problems such as creases as explained above.
[0012] In addition, there is a method of reducing the drying temperature of the printing press as a method to simultaneously prevent the occurrence of offset wrinkles and the occurrence of air bubbles. However, if the drying temperature is excessively reduced, that is, the temperature of the paper surface at the outlet of the dryer, the drying of the ink will not be sufficient. New problems such as scratches on the printing surface occur in subsequent processes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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 continuously use pregelatinized oxidized starch (Product name: Eichisu A / manufactured by Oji Konstaichi) Use a double-roll gluing press to apply gluing and pressing (the coating 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 re...

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 with an average particle diameter of 0.6 μm (trade name: FMT90 / manufactured by Faimatec) 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 with a diameter of 0.6 μm (trade name: FMT90 / manufactured by Faimatec) was prepared 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 coate...

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Abstract

A coated paper for print purpose and its making method are disclosed. Said coated paper features that a PVA-series resin composition composed of polyvinyl alcohol with 90 mole% of saponified degree and the polyacrylic acid (or its salt) and / or cellulose derivative (or its salt) in wt ratio of 100:(0.1-10) is coated on both surfaces of basic paper and the mixture of pigment and adhesive is coated on at least one surface of basic paper to obtain 500-1000 g / sq.m.24hr of moisture permeability. When it is in friction with offset print roller, the wrinkles and air bubble can not be generated.

Description

[technical field] [0001] The present invention relates to a coated paper for printing, in particular to a paper that can not only prevent the occurrence of offset rotary wrinkles (sometimes called wrinkles in the printing industry) that often occur in the drying process after printing during rotary offset printing, but also prevent the occurrence of blisters. Coated paper for printing. [Background technique] [0002] In recent years, with labor-saving or high-speed printing in the printing industry, the printing method tends to develop from offset sheet-fed printing to web rotary offset printing (hereinafter referred to as offset rotary printing). The production efficiency of offset rotary printing is much higher than that of offset sheet-fed printing due to its fast printing speed and labor-saving post-processing. [0003] However, offset rotary printing has several quality problems that are not found in sheet-fed printing because hot air drying is performed immediately af...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H19/44D21H19/84
Inventor 藤原诚二福井照信铃木由纪子
Owner OJI PAPER CO LTD
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