The Impact of Pressure Screen Basket on Pulping

The pressure screen basket is a critical component in the pulp screening system, widely used in the paper making industry to separate good fibers from impurities and coarse materials. Installed inside the pressure screen, the pressure screen basket works together with the rotor to achieve efficient fiber classification through continuous pressure pulses. Its slot or drilled hole structure allows qualified fibers to pass through while retaining contaminants such as shives, plastics, and stickies. In the pulp and paper production line, screening equipment is a key part to ensure pulp quality, stabilize paper machine operation, and improve paper quality. As the core filtering component of the pressure screen, the screen basket directly determines the screening efficiency, impurity removal effect, and equipment service life.

Pressure Screen Basket Specific Classifications

The pressure screen basket can be systematically classified based on three key factors: opening type, structural design, and pulp flow direction. Different opening forms determine the screening accuracy and impurity removal efficiency. Structural variations affect the strength, wear resistance, and service life of the basket. In addition, the pulp flow direction plays an important role in defining the screening method and application scenario.

Classification of Pressure Screen Basket by Opening Type

According to the opening form, the screen basket can be divided into drilled screen basket and slotted screen basket

• Drilled Screen Basket

The pressure screen basket surface is a uniformly distributed round hole with a diameter of usually 1.0-3.0mm. It has a sturdy structure, strong impact resistance, and is not easily deformed or damaged. Mainly used for coarse screening, removing large particle impurities such as plastic sheets, metal wires, and sawdust from pulp, suitable for working conditions such as waste paper pulping and chemical pulp coarse screening, with the advantages of strong durability and large processing capacity.

• Slotted Screen Basket

Design of the Slotted Screen Basket: The slotted screen basket surface is a parallel precision narrow slot with a slot width of 0.1-0.5mm, and the filtration accuracy is much higher than that of the drilled screen basket. It is divided into flat slotted screen basket and waveform slotted screen basket. Among them, the waveform slotted screen basket is the first choice for fine screening because its surface grooves can guide fiber flow, greatly reducing the risk of slurry blockage. It’s mainly used for pre-screening, pulp grading, coarse and fine screening to ensure uniform and delicate paper production.

Classification of Pressure Screen Basket by Structure and Manufacturing Process

According to the structural process, the pressure screen basket can be divided into: plate type screen basket and rod type screen basket.

• Plate Type Screen Basket

This pressure screen basket is made by rolling and welding stainless steel sieve plates, it is easy to process and has a moderate cost. It’s suitable for screening medium and low concentration pulp, it is a common choice for small and medium-sized paper enterprises and widely used in conventional pulp screening processes.

• Rod Type Screen Basket

The rod type pressure screen basket is made of wedge-shaped stainless steel rods arranged precisely along the circumference, with uniform gaps, extremely strong rigidity, excellent wear resistance, anti blocking, and anti-corrosion performance. It can withstand the impact of high concentration and high impurity pulp, with a service life far exceeding that of plate screen basket. It is mainly used in large-scale waste paper pulp production lines, high concentration screening, and heavy impurity conditions, and is the core configuration of high-end screening equipment.

Classification of Pressure Screen Basket by Pulp Flow Direction

According to the direction of pulp flow, pressure screen basket can be divided: inflow pressure screen, outflow pressure screen, upflow pressure screen

• Inflow Screen Basket

The pulp flows from the inside of the screen basket to the outside, and the good pulp is collected externally. The screening accuracy is high and it is suitable for pre-screening precision. Understanding the Differences Between Outflow and Inflow Screen Baskets.

• Outflow Screen Basket

Design of the Outflow Screen Basket: The pulp flows from the outer side of the screen basket toward the inner side, thereby facilitating the settling of heavy impurities. It is suitable for coarse screening to remove impurities.

• Upflow Screen Basket

Vertical structure, with pulp entering from the bottom and good pulp ascending, impurities are discharged in layers, suitable for efficient purification of waste pulp.