Method for reducing the breaking rate of long fibers in the refining process of papermaking using waste paper

Abstract

The invention discloses a method for reducing the fiber breaking rate in the pulping process using waste paper for papermaking. The method includes the steps that large-diameter brooming millstones with blunt teeth on pulping surfaces are selected to serve as the upper millstone and the lower millstone, the angle of a to-be-pulped material flowing past a pulping area is smaller than 360 degrees inthe pulping process, and liquid molecules in the to-be-pulped material in the puling area are subjected to bubble nucleation under the ultrasonic action in the pulping process. In the pulping process, fiber can be quickly broomed, objects adhering to the surface of the fiber are quickly separated, and abrasion and breaking of the fiber are reduced, so that long fiber larger in amount and higher in proportion exist in pulp, damage is less, the quality of the papermaking pulp is better, the utilization rate of the papermaking pulp in the net papermaking technology is increased, the leakage rateand the return rate of the net papermaking process can be reduced, the production cost can be reduced, and corrugated core paper and kraft paper with better quality can be obtained.

Description

technical field [0001] The invention relates to the technical field of paper refining process using recycled waste paper, in particular to a method for reducing the breakage rate of long fibers in the paper refining process using waste paper. Background technique [0002] Corrugated boxes are made of corrugated core paper and kraft paper. At present, under the double drive of environmental protection and production cost reduction, the corrugated box and corrugated core paper and kraft paper used to manufacture corrugated boxes are produced using recycled waste paper. Recycled waste paper needs to go through process steps such as pulping treatment, multiple coarse screening, refining treatment, multiple fine screening treatment and multiple pressure filtration and slag removal treatment. The fibers in the waste paper are broken and damaged, especially in the grinding process. During the pulping process, the grinding time is long, the grinding disc is seriously worn, and the g...

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Problems solved by technology

[0003] In addition, in the follow-up fine sieving treatment and filter press slag removal treatment, a large number of fibers whose length does not meet the standard in the slurry will be removed. It will also leak from the grid, and the return flow of the wire part is too large. Therefore, the utilization rate of the fiber in the slurry is relatively low. Environmental protection treatment should be carried out for the residue removed in the slurry and the slurry returned to the wire part. , the production efficiency is not high, and the production cost is also high

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