Process for recycling and preparing coated white board paper by using waste paper

Abstract

The embodiment of the invention discloses a process for recycling and preparing coated white board paper by using waste paper. The process comprises the following steps of: taking waste paper, repulping, screening, deinking, deslagging, washing and concentrating, whitening, storing in a pulp pool and making paper, wherein the step of repulping comprises the steps of dispersing the waste paper into a fiber suspension liquid, heating the fiber suspension liquid to be at 40-55 DEG C, adding a cellulose liquid and rotating for 20-35minutes so as to conduct primary deinking; the step of deinking comprises a step of further deinking by using an ultrasonic generator; the step of whitening comprises steps of oxidation and reduction whitening; the step of making paper comprises the steps of respectively feeding the whitening pulp into a surface layer, a core layer and a base layer of a paper machine conveying system, respectively making the pulp into three layers by using a paper machine according to the ratio of 38-78wt%, 15-35wt% and 12-30wt%, and subsequently conducting composite paper making so as to manufacture a raw paper board. According to the process, no raw wood pulp is used, so that the resource is saved, the environment is protected, the production cost is lowered, and moreover the produced white board paper is good in whiteness, high in strength and applicable to requirements of high-quality package and decoration.

Description

technical field [0001] The invention relates to a papermaking process, in particular to a process for preparing coated white board paper by recycling waste paper. Background technique [0002] As we all know, the paper industry is an important industry that is closely related to the development of the national economy and the construction of social civilization, and the gap between my country's paper industry and the international advanced level is very large, among which the unreasonable structure of raw materials and insufficient supply, waste of resources and environmental pollution are the main factors. Improving the level of waste paper recycling and utilization is of great significance to the development of my country's paper industry. Although my country has achieved a relatively high level of waste paper utilization, the waste paper recycling level in my country is low, which leads to the need to import a large amount of waste paper from abroad every year, and is high...

AI Technical Summary

Problems solved by technology

[0005] However, white board paper is generally made of waste paper or wood pulp as raw materials. Its surface layer can be made of primary wood pulp, and other layers can be made of secondary waste paper raw materials. It is suitable for my country's national conditions, and the process of producing coated white board paper Complicated, there are quality deficiencies such as low production efficiency, high cost, and poor coating effect in the existing technology