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Knack for Paper Pulp Washing

Factors affecting the washing are types of fiber raw materials, pulp hardness, washing water temperature, slurry thickness and dryness, vacuum degree, etc., the specific analysis is as follows:

1. Pulp species

The most important influence factor is the pulp species. General long fiber has good drainability performance, easy for dry washing, straw pulp has poor drainability, more difficult to wash. According to the difficulty of raw materials washing, the sequence is as follows:

Straw pulp – wheat straw pulp – bagasse pulp – silvergrass reed pulp – bamboo pulp – wood pulp – cotton pulp

2. Pulp hardness

After cooking, the same raw material will have different hardness, and the drainability performance is also different. If hardness of the pulp is high, the viscosity is small, the performance of drainability is good at the beginning, but the final washing degree is relatively poor. This is because a part of the waste liquid exists inside the fiber, if the slurry has high hardness, fiber damage is small, the waste liquor inside the fiber gradually diffuses outward from the cells mainly through the pits, nearly in static state, the washing speed Is very slow. If you require cleaning, you need a long soaking time.

The higher the hardness of the pulp, the less fiber surface loss is, if it is very hard and not soft, diffusion resistance of waste liquor within the fiber will be greater, and washing will be more difficult.

3. Washing water temperature

The washing water temperature has a great influence on the washing. If water temperature is high, viscosity is low, filtration resistance is small, diffusion will be fast, promoting washing and replacement.

4. Slurry thickness and dryness

When the slurry is thick, the filter resistance will be great, filtration speed will be low, which is not conducive to the diffusion of pulp, and the residual alkali in the slurry will be relatively high.

5. The impact of vacuum degree on washing

Vacuum degree is one of the important factors affecting the washing. If vacuum degree is large, filtration speed will be fast, and pulp dryness will be large, too large vacuum degree will make pulp dryness large, and the slurry paste the mesh,which will affect the filtration. Therefore, it generally does not exceed 300 ~ 350mm Hg.

6. Others

Leizhan can offer high-performance Screw Press Washer suitable for washing and thickening all kinds of paper pulp which is used in paper pulp processing line, feel free to contact with us if you have any needs,email:


Zhengzhou Leizhan Technology Paper Machinery Co., LTD., founded in the year 1980, is a professional manufacturer in researching and developing complete sets of waste paper pulp equipment. Our waste paper recycling plants and pulp equipment are highly praised by customers in paper making industries around the world.

Leizhan paper pulp machine are mainly about pressure screen( M.C. pressure screen, Inflow pressure screen ), Drum Pulper VS D type Hydrapulper, Bale Opener, waste paper Chain Conveyor, Pulp Pump, Vertical Hydrapulper, Light Impurity Separator, Auto-cleaning Vibrating Screen, Reject Separator, refiner equipment, etc.

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