Production method of lightweight paper

Abstract

The invention discloses a production method of lightweight paper. The production method comprises a wood pulp proportioning step and a mixing step. Needle BCMTP chemimechanical pulp and needle bleached chemical wood pulp are proportioned and pulped; a neutral sizing agent, cationic starch, cationic polyacrylamide and talcum powder are used; then a paper manufacturing process is performed. Importedneedle wood pulp and broadleaf wood bleached sulfate pulp are respectively pulped and blended, and various additives are added; the blend is conveyed into an approaching system for dehydration forming through a wet part and then is further dehydrated through a squeezing part; after pre-drying, semi-dry calendaring and surface sizing are performed, the product is dried through a drying part; the product is baked at low temperature, subjected to soft calendaring finishing and wound. First of all, high bulkiness is achieved, and the flatness and the tensile strength of paper are not affected, sothe production method is suitable for high-speed printing; secondly, no flourescent brightener is contained; compared with common coated paper, offset paper and lightweight paper, the lightweight paper produced according to the method is relatively dark and has a color close to the primary color of wood pulp, so that visual fatigue cannot be caused by long-time reading.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a method for producing lightweight paper with high opacity and bulk. Background technique [0002] Lightweight printing paper is a paper type that has developed rapidly in western countries in recent years. It generally contains more than 70% mechanical wood pulp and less than 30% bleached chemical pulp. The paper is bulky and crisp, with good ink absorption and opacity. In terms of strength, it can meet the printing requirements of high-speed rotary printing machines. The whiteness is generally not higher than 80%. As a kind of book printing paper, it is widely used. It is widely used in books, periodicals, student textbooks, advertisements, etc. Because mechanical pulp has less pulping materials, less chemical consumption, easy sewage treatment, and soft paper tones, it is called environmentally friendly paper. [0003] Lightweight printing paper has high bulk and opacity...

AI Technical Summary

Problems solved by technology

From a medical point of view and optical principles, the use of high-whiteness paper is extremely detrimental to human vision

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