The core equipment in the paper pulp industry--Screw extruder

1、Core function and working principle

Dewatering and thickening

Through the mechanical pressure generated by the rotation of the screw shaft, the slurry is axially pushed and squeezed in the filter drum, which can deal with various types of slurry, such as chemical pulp, chemical-organic pulp, waste paper pulp, etc., and the thickening efficiency can be up to 70%-90%.

Concentration adjustment

The equipment is equipped with automatic resistance pressure plate device and back pressure adjustment system, which can accurately control the pulp consistency (35%-45%) to meet different process requirements.

Structural features

Optimized design of screw blades improves wear resistance and reduces the risk of clogging.

Some models are equipped with backflush device and pneumatic back-propulsion device to ensure dewatering uniformity and pulp stability.

2、Main application fields

Paper industry 

Black liquor extraction and concentration of raw materials such as wood pulp, bamboo pulp and waste paper pulp.

Pretreatment and black liquor recovery of hot dip pulp.

Chemical fiber and textile industry

Dehydration and concentration of cotton and linen pulp to improve fiber quality.

Environmental protection and new energy

Solid-liquid separation of waste materials (e.g. straw, medicine residue).

Potential applications in the field of biomass energy (e.g. pretreatment of fiber-based raw materials).

Laboratory and small-scale production

Concentration and washing of special media such as chemical pulp and pharmaceutical liquid.

3、Technological development and innovation

New blade design: enhance wear resistance and mixing efficiency, improve pulping effect.

Automation control: Integration of sensors and intelligent system to realize remote monitoring and precise adjustment.

Multi-functional expansion: some models can be equipped with washing and drying modules to form an integrated production line.

4、Industry Trend

With the improvement of environmental protection requirements, the screw pulp extruder is developing in the direction of high efficiency, energy saving and green, for example, by optimizing the structure to reduce energy consumption, and using corrosion-resistant materials to extend the life of the equipment. At the same time, the integration of intelligent technology (such as Internet of Things monitoring) to further enhance the efficiency of equipment operation and maintenance.

In summary, with its stable performance and wide adaptability, the screw extruder has become an indispensable key equipment in the papermaking and pulping industry chain.