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Printing paper

A printing paper and pulp technology, which is applied in papermaking, paper post-processing, pulp bleaching, etc., can solve the problems of poor pulp fiber strength and low pulp yield, and achieve the effects of fading suppression and environmental benefits

Inactive Publication Date: 2006-08-30
NIPPON PAPER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, a large amount of chemicals are required to decompose and remove lignin, and this treatment causes problems of low pulp yield after bleaching and poor pulp fiber strength
In addition, to remove hexenuronic acid, a large amount of acid is required, which in turn causes the problem of poor pulp fiber strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Sulfuric acid was mixed with 10 parts of BCTMP (1) (bleached chemical thermomechanical pulp, Mira-Westan Company, ISO brightness 85%, freeness CSF 250ml) and 90 parts of LBKP (freedom CSF 400ml). Aluminum 0.9% (relative to pulp), internal additive cationized starch (trade name: Cato 3210, manufactured by NSC Co., Ltd.) 0.5%, and light calcium carbonate and talc powder after making paper to make the ash content 6%. A mixture of 6:4, paper weight per unit area is 46g / m on an orientation paper machine (manufactured by Kumagai Riki Industry Co., Ltd.) 2 of paper. The sample was dipped in a 6% sodium borohydride (w / v) aqueous solution, and placed on a glass plate. At this time, the impregnation amount of sodium borohydride was 18% by weight of solid matter relative to the weight of pulp solid matter. Use 40mJ / cm 2 • Pulsed, 5 Hz KrF excimer laser light was irradiated for 40 minutes. After the laser irradiation is completed, the sample is washed with water, dried with a d...

Embodiment 2

[0071] Except having made the compounding quantity of BCTMP (1) into 30 parts, and the compounding quantity of LBKP into 70 parts, it carried out completely the same operation as Example 1.

Embodiment 3

[0073] Except that BCTMP (1) was replaced with BCTMP (2) (Mira-Westan Co., ISO whiteness 70%, soft material 25%, aspen 75%), the same operation as in Example 2 was carried out.

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PUM

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Abstract

Printing papers with reduced discoloration are obtained by using a pulp with improved discoloration. Printing papers with remarkably improved discoloration can be obtained by including a pulp consisting of one member or a mixed pulp of two or more members of bleached or unbleached mechanical pulps, semichemical pulps, chemical pulps and deinked pulps irradiated with UV and / or visible light in the presence of at least one additive selected from the group consisting of reducing agents, oxidizing agents and hydrogen-donating organic compounds.

Description

technical field [0001] The present invention relates to a printing paper that is bulky and has a small change in whiteness over time, that is, less fading, and is particularly suitable for printing paper. Background technique [0002] With the improvement of the degree of environmental protection, on the effective use of paper pulp made from forest resources, chemical pulp such as kraft pulp, alkaline pulp and sulfite pulp with a production rate of about 50% (hereinafter referred to as CP ) compared with mechanical pulp such as stone groundwood pulp, refined groundwood pulp, pressure groundwood pulp, thermomechanical pulp, chemical thermomechanical pulp and bleached chemical thermomechanical pulp (hereinafter referred to as MP) is advantageous. In addition, it is also necessary to improve the utilization rate of waste paper pulp (hereinafter referred to as DIP) that is used once and then dissociated. [0003] On the other hand, lightness is the main quality that paper need...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/00D21H25/00D21C9/10D21C9/00D21H17/63D21H25/04
CPCD21H17/63D21C9/001D21H25/04
Inventor 越智隆宫脇正一大内秋比古
Owner NIPPON PAPER IND CO LTD
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