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Coating paper for printing

A technology for coating paper and pulp, applied in papermaking, papermaking machine, wet end of paper machine, etc., can solve the problem of reducing the number of microfibers, and achieve the effect of good texture, strong interlayer strength and excellent printability

Active Publication Date: 2010-06-09
OJI HLDG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, fine fibers may flow out from the surface layer of the paper, and there is a problem that the number of fine fibers decreases relative to the total paper (Patent Document 11)

Method used

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  • Coating paper for printing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0123] Production of hardwood pulp

[0124] Using a Lo-Solids cooking kettle (manufactured by Andritz Group), the broad-leaved tree chips formed by Acacia mangium: Eucalyptus grandis=30:70 (mass ratio) were subjected to kraft cooking by Lo-Solids cooking method. At this time, white liquor with a degree of sulfidation of 28 was used. Regarding the white liquor addition rate, 10% of active alkali was added to the chips supply system relative to the absolute dry mass of chips, and 8% was added to the cooking zone, and 2% was added to the In the washing area, cooking is carried out at a cooking temperature of 146°C. After the steamed flakes are disentangled, they are washed, screened, and washed again to obtain unexposed pulp.

[0125] In the aforementioned unexposed pulp, 1.7% caustic soda and 1.8% oxygen were added per dry pulp mass, and two-stage oxygen-alkali bleaching was carried out at a pulp concentration of 10%, 98°C, and 50 minutes. At this time, caustic soda is added...

Embodiment 2

[0144] Production of hardwood pulp

[0145] As a beating treatment condition, in addition to making the pulp concentration 4.3%, it is introduced into a double-action disc refiner connected in parallel with 3 machines (knife material: SUS, knife width: 1.0mm, groove width: 2.0mm 1 machine and knife material : 17 chromium, blade width: 2.4mm, groove width: 2.4mm (2 machines used in combination), beat to CSF450ml, and obtain hardwood pulp in the same manner as in Example 1.

[0146] Production of conifer pulp

[0147] In Example 1, except that the softwood bleached pulp (concentration: 4.4% by mass) was introduced into a 1-unit double-action disc refiner (knife material: 17 chrome, knife width: 4.8mm, groove width: 4.8mm), Beat until CSF was 480 ml, and obtain conifer beating pulp in the same manner as in Example 1.

[0148] Production of base paper

[0149] In the pulp slurry mixed with coniferous trees: broad-leaved trees=10:90 (mass ratio) by the aforementioned beati...

Embodiment 3

[0153] Production of hardwood pulp

[0154] As a beating treatment condition, in addition to making the pulp concentration 4.4%, it is introduced into a double-action disc refiner connected in parallel with 3 machines (knife material: SUS, knife width: 1.0mm, groove width: 2.0mm 1 machine and knife material : 17 chromium, blade width: 2.4mm, groove width: 2.4mm (2 machines used in combination), beat to CSF400ml, and obtain hardwood pulp in the same manner as in Example 1.

[0155] Production of conifer pulp

[0156] As the beating treatment conditions, in addition to making the pulp concentration 4.4%, introducing it into a 1-machine double-action disc refiner (knife material: 17 chrome, knife width: 4.8mm, groove width: 4.8mm), and beating to CSF480ml, Conifer beating pulp was obtained in the same manner as in Example 1.

[0157] Production of base paper

[0158] In the pulp slurry mixed with coniferous trees: broad-leaved trees=5:95 (mass ratio) by the aforementioned ...

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Abstract

The invention provides a coating paper for printing obtained by a twin-wire former type paper machine with excellent texture, paper interlayer intensity, rigidity and printing aptitude, characterized in that: more than 50 weight% of bleached pulp uses eucalypt material or acacia material as the raw material and the bleached pulp is pulped by gradually adding cooking liquor and subjected to many segments of bleaching processing steps. The coating paper for printing is produced by the following steps: forming a wet paper; squeezing the wet paper; drying the squeezed paper; setting more than one paint coating layer. The weighted mean fiber length of the dissociated paper pulp is 0.6-2.0mm and the fiber length distribution coefficient is 1.5-4.0 and the aspect ratio of the tensile strength of the coating paper is below 3.0.

Description

technical field [0001] The present invention relates to coated paper for printing. In particular, it relates to a coated printing paper excellent in texture, interlayer strength, rigidity, and printability. [0002] This application claims priority based on Japanese Patent Application No. 2008-275087 for which it applied in Japan on October 27, 2008, and uses the content here. Background technique [0003] Generally, coated paper for printing is produced by coating a base paper with a coating solution mainly composed of pigments and binders, and then drying it. Depending on the amount of coating solution applied and the processing method of the coated paper, it can be classified Examples include cast-coated paper, art paper, coated paper, lightweight coated paper, and the like. These coated papers are widely used as commercial printed materials such as billboards, pamphlets, posters, etc., or publications such as books and magazines after multi-color printing or monochrome...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H19/36D21F1/04D21F3/02D21F5/00
Inventor 山本学川畑宣明
Owner OJI HLDG CORP
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