Method for preparing paper base by using needle and broad leaf-mixed sulfate elemental chlorine-free bleached chemical pulp

Abstract

The invention discloses a method for preparing paper base by using needle and broad leaf-mixed sulfate elemental chlorine-free bleached chemical pulp. The method comprises the following steps: (1) cooking by using a sulfate digestion method to obtain needle and broad leaf-mixed pulp as a pulp raw material, dividing the obtained needle and broad leaf-mixed pulp into three parts, and respectively pulping the three parts of pulp, wherein the beating degree of the first part of pulp is 10-20 degrees SR, the beating degree of the second part of pulp is 45-50 degrees SR, and the beating degree of the third part of pulp is 55-65 degrees SR; (2) mixing the three parts of pulp prepared in the step (1) together according to a certain proportion to obtain mixed pulp, wherein the mass ratio of the first part of pulp to the second part of pulp to the third part of pulp in the mixed pulp is equal to (10-20) to (60-85) to (5-10); (3) molding the mixed pulp obtained in the step (2) by lifting or pressing to obtain a paper base material.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a method for preparing a paper base from needle-leaf mixed sulfate element chlorine-free bleached chemical pulp. Background technique [0002] my country is the largest paper-making country in the world. In 2010, my country's paper and cardboard output surpassed that of the United States, ranking first in the world. At present, my country's total output of paper and paperboard has exceeded a quarter of global output. With the rapid development of my country's paper industry, wood biomass has become the main raw material of my country's pulp and paper industry, accounting for about 60% of paper fiber raw materials. These wood materials mainly include coniferous wood and hardwood. With the development of society and science and technology, using the component separation technology of wood fiber papermaking raw materials, while separating them to prepare traditional chemical pu...

AI Technical Summary

Problems solved by technology

However, the sizing thickness, stiffness and strength of the paper will all decrease, especially for paper that has been overpressed, and the decline will be even greater.

In addition, paper with fillers is prone to dusting and hair loss, and these shortcomings need to be compensated by strengthening agents and surface sizing

The addition of a large number of chemicals will change the composition of the paper, which will cause certain harm to the environment during use or subsequent degradation

[0005] Some papers have higher requirements for tensile strength, tightness and smoothness: such as transfer printing paper, when transferring printing, dyes need to be printed on the transfer printing paper, the amount of dye adsorption and the uniformity of dye distribution depend on Adsorption on the surface of paper directly affects the quality of transfer printing; for example, thermal paper is specially used for thermal printers and thermal fax machines, and is generally divided into three layers, including the bottom paper base, the second The first layer is a heat-sensitive coating, and the third layer is a protective layer. If the heat-sensitive coating is uneven, it will cause some places to be dark in color and some places to be light in color, and the printing quality will be significantly reduced.

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