In the pulp making process, the pressure screen basket is the core equipment. Its main function is to remove impurities from the pulp and help improve the quality of the production paper web.
Proper use and maintenance of pressure screen baskets can help reduce energy consumption for pulp production and effectively extend their lifespan.
Therefore, maintaining the optimal operating conditions of the basket screen directly affects the entire pulp production line.
What Pressure Screen Basket Fiber Hanging Is
In the pulping system, fiber hangs on the pressure screen basket when high-quality slurry enters the pressure screen basket through the screen slots (or outside). When pulp fibers or contaminants accumulate and plug the slots or holes, they blind the screen and reduce operational efficiency.
Pressure Screen Basket Fiber Hanging Influence
After the pressure screen basket fiber hanging occurs, it will not only affect the quality of the final pulp produced, but also reduce the operating efficiency of the pressure screen equipment and the entire pulping line.
Affect Final Paper Web Quality
When fiber clumps adhere to the good-pulp side of the pressure screen basket, they may detach under the action of the rotor and pulp flow. Then they will enter the headbox with the good pulp. This causes uneven final paper formation, localized basis weight fluctuations, or even pulp slugging and paper breakage, greatly increasing unplanned downtime and seriously affecting product quality.
Increase Equipment Load
If the fiber clumps continuously accumulate on the surface of the pressure screen basket, they occupy the normal working clearance between the rotor and the basket, increasing rotor operation resistance. This shortens the service life both of the pressure screen basket, rotor, and the pr
essure screen, and increases its operating load.
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Pressure Screen Basket Fiber Hanging Causes & Solutions
High Long Fiber Content Percentage of the Raw Material
When the long fiber is too much of the fiber raw material you use, with its greater length than the width of the pressure screen basket slot. It will cause the fiber to be unable to pass through the sieve opening smoothly and thus remain on the surface of the sieve drum, forming a bridge.
Solutions
When selecting the pressure screen basket, you should fully consider the type of paper you are producing, the fiber type, and the raw material ratio you require. Choose a screen basket with a greater slot width than the length of the long fibers you require to avoid fiber bridging.
If you find considering these factors too troublesome, you can also find a supplier with technical support to recommend a suitable pressure screen basket based on the key parameters you provide.
Pressure Screen Basket & Rotor Wearing
The slurry is relatively clean when it reaches the pressure screen, but prolonged use can still cause varying degrees of collision, deformation, and wear between the pressure screen basket and rotor.
After a collision, the screen bars on the pressure screen basket deform, potentially bridging with adjacent bars. This causes the screen slot to close, preventing fibers from passing through and making them prone to clumping together.
For rotor blades collisions and wear, there will be larger gaps between the rotor and the pressure screen basket. This attenuates the pulse in that area, reducing the pressure screen’s ability to compress and backwash that area. It will result in insufficient slurry passage through the pressure screen basket slots, leading to fiber retention and flocculation.
Solutions
Regularly inspect the wear condition of the pressure screen basket and rotor. Replace worn parts promptly.
Check the gap between the rotor blades and the pressure screen basket. Adjust it as needed to prevent fiber flocculation caused by excessively large or small gaps.
Promptly clean the pressure screen basket and remove loose metal particles to prevent further wear on the pressure screen basket and rotor caused by their shedding.
