Method for preparing kraft cardboard paper

Abstract

A technology for making kraft paper includes breaking the used paper, hydrolyzing, removing dirt, screening, thermal dispersing, grinding, mixing, adding retaining aid, shaping, squeezing baking, press finishing and winding. Its advantages are high utilization rate of fibre material, high uniformity, high speed and output, and less sewage drainage.

Description

Technical field: [0001] The invention relates to a preparation method of kraft liner board, which belongs to the technical field of papermaking industry. technical background: [0002] Before the present invention was made, in the prior art, the production of kraft linerboard with waste paper vermicelli mainly adopted the following operation steps: the waste paper was transported to the pulper through the feed machine for disintegration, and the disintegrated pulp was first passed through the high-concentration The decontamination machine removes heavy impurities such as metals and stones, and then removes some relatively large impurities through a coarse sieve. The fine pulp from the coarse sieve goes through the low-consistency decontamination machine to remove some light impurities and heavy impurities whose specific gravity is different from that of the fiber, and then goes through a fine sieve to further remove the impurities with a different size and shape from the fib...

AI Technical Summary

Problems solved by technology

[0003] 1. The retention rate of pulp is too low, resulting in waste of fiber raw materials;

[0004] 2. The concentration of white water in the head box and under the net is too high, and the paper in the net part is not well interwoven and the evenness is not good;

[0005] 3. The white water under the screen contains more fine fibers, which is easy to cause rotten pulp, which leads to an increase in the end-break rate of the paper machine, and affects the water filtration speed of the screen, making it difficult to increase the output, and will also increase the waste water treatment load and equipment power consumption.

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