Low-whiteness two-side offset printing paper preparation process, paper production method and low-whiteness two-side offset printing paper

Abstract

The invention provides a low-whiteness two-side offset printing paper preparation process, a paper production method and low-whiteness two-side offset printing paper. The low-whiteness two-side offset printing paper preparation process comprises the following steps: a pulping step: respectively preparing high-whiteness long-fiber paper pulp with a whiteness of 89-90%, low-bleached short-fiber paper pulp with a whiteness of 75-85% and chemimechanical pulp with a whiteness of 79-83%; a pulp preparation step: uniformly mixing the following components in percentage by weight: 5-30% of high-whiteness long-fiber paper pulp, 55-80% of low-bleaching short-fiber paper pulp and 5-30% of chemi-mechanical pulp to obtain mixed pulp; chemicals adding: adding a fluorescent whitening agent with a mass concentration of 0.1-5.0%, a purple pigment with a mass concentration of 0.1-0.5% and a blue pigment with a mass concentration of 0.1-0.5% into the mixed pulp, wherein the adding amount is calculated according to the content of each ton of paper: 0.01-0.1 kg of the fluorescent whitening agent, and the purple pigment and the blue pigment are 5-20 g; and a papermaking step.

Description

technical field [0001] The disclosure relates to the technical field of papermaking, in particular to a low-white offset paper and a manufacturing method thereof. Background technique [0002] The current high-white offset paper products have high whiteness and have at least the following disadvantages: [0003] 1) The whiteness of the raw material pulp is highly required, and the general requirement is ISO whiteness ≥ 89% (ISO2470). In the pulping process, there are many bleaching sections, which is not environmentally friendly; [0004] 2) The hue of the paper is high, and the hue synchronization when the paper is made into the final product is relatively high, which will damage the eyesight of readers; [0005] 3) It is necessary to add a large amount of pigments and OBA for coloring, and the cost of chemicals is high; [0006] 4) The stabilizer component of OBA contains urea, which is not left in the paper during production, but enters the sewage treatment system with ...

AI Technical Summary

Problems solved by technology

[0002]The current high-white offset paper products have high whiteness and have at least the following disadvantages:

[0003]1) The whiteness of the raw material pulp is highly required. The general requirement is that the ISO whiteness ≥ 89% (ISO2470). Environmental friendly;

[0004]2) The hue of the paper is high, and the hue synchronization when the paper is made into the final product is relatively high, causing damage to the eyesight of readers;

[0005]3) It needs to add a lot of pigments and OBA for coloring, and the cost of chemicals is high;

[0006]4) The stabilizer component of OBA contains urea, which is not left in the paper during production, but enters the sewage treatment system with white water discharge, resulting in denitrification of sewage The pressure of treatment and discharge is high, which is not conducive to environmental protection

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