A process for producing low basis weight high-strength corrugated paper on a high-speed paper machine

Abstract

The invention relates to the field of papermaking, specifically a process for producing low-quantity high-strength corrugated paper on a high-speed paper machine. The process adjusts the raw material ratio of corrugated paper and adds easily soluble polyvinyl alcohol fiber, CMS or CMC and PAE wet Strong agent is used to produce high-strength corrugated paper without surface sizing. Polyvinyl alcohol fibers are insoluble in water at low temperature, and the fiber length basically exists in the form of long fibers, which improves the current situation of many fine fibers in the pulp and improves the pulp. Excellent water drainage, through the forming of the wire part, the retention rate in the pulp can reach more than 99%; after the forming, the temperature of the drying cylinder is raised, and the polyvinyl alcohol fiber can be dissolved in the paper to enhance the effect, avoiding the pulp. Various negative effects brought about by adding enhancers.

Description

technical field [0001] The invention relates to the field of papermaking, and relates to a process for producing low-quantity high-strength corrugated paper on a high-speed paper machine. Background technique [0002] The cartons used for packaging are made of folded corrugated cardboard. Corrugated cardboard mainly includes three-layer corrugated cardboard, five-layer corrugated cardboard, and seven-layer corrugated cardboard according to the number of layers. The components: face paper + corrugated paper + core paper + corrugated paper + lining paper. Among them, corrugated paper is used for corrugation between the face paper and the inner paper. The horizontal ring pressure index of this kind of paper is relatively high. If the ring pressure index does not meet the requirements, it can only be used as core paper, and the quality grade is relatively low. At present, the development trend of corrugated cardboard is light weight and high strength, which requires that the co...

AI Technical Summary

Problems solved by technology

The disadvantage is that it has high requirements and sensitivity to the production system. Small changes in the parameters such as concentration, charge, and temperature in the system will cause great fluctuations in production. There is no surface sizing device.

[0005] If a high-speed paper machine is used to prepare corrugated paper, due to the high sensitivity of the system conditions of the high-speed paper machine, the above-mentioned means for increasing the strength of corrugated paper to meet the requirements of use has the following disadvantages: the wet strength agent has a strong positive charge. When used in large quantities on high-speed paper machines: on the one hand, a large amount of foam will be generated, and the production cannot run normally; on the other hand, the addition of a large number of strong cationic substances will destroy the charge balance of the system. When it is converted to a positive charge, the fiber binding force is poor, the strength of the paper sheet is low, the paper is broken seriously, and the equipment cannot be operated; the third is the low retention rate, a large amount of chemicals and fine fibers cannot stay in the paper sheet and are lost to the paper. In white water, the corresponding effect cannot be achieved; the fourth is that most of the above-mentioned additives are water-soluble, except for a part that stays in the paper and works, a large part enters the water cycle with white water and finally enters the waste water, wasting chemicals. At the same time, it also increases the COD, BOD or SS load of wastewater