Applications of the Sieve Bend Screen in the papermaking industry

JX Filtration December 22, 2023 Sieve Bend Screen

The Sieve Bend Screen is an economically practical solid-liquid separation device. In the papermaking industry, it can be used for white water fiber recovery, pulp concentration, purification of water for spraying and sealing, classification of long and short fibers, fiber/filler separation, white water filtration, and wastewater treatment, among other purposes.

The Sieve Bend Screen mainly features the following performance characteristics:

Stainless steel slotted arc screen plate with slot width adjustable from 5 to 3000 microns;
Pressure feed and slotted structure ensure high filtration capacity;
Automatic cleaning of the screen plate and feed port, preventing clogging and ensuring continuous operation of the equipment;
Compact structure, no rotating parts, easy installation and maintenance, leak-free fully enclosed structure, and a clean working environment.

According to JX Filtration's technical engineer, a crucial aspect for optimal functioning of the inclined sieve is that the sticks forming the screen plate should have a sharp upper edge in contact with the fluid. If the water contains abrasive substances, the upper edge of the sieve stick will gradually wear to a rounded shape, while the lower edge will become sharp.

In this case, periodically reversing the screen plate, flipping it upside down, is beneficial for extending the screen plate's lifespan and restoring screening efficiency. Fibers in the suspension are always orderly arranged along the flow direction. In this way, the majority of fibers with lengths greater than the slot width will be trapped on the surface of the screen plate, sliding down to the discharge outlet, and depending on the application, the discharge concentration is 3-4% solid content.

Under normal operating conditions, the screen plate causes continuous turbulence in the fluid. If there is a tendency for clogging under abnormal conditions, it can be easily cleaned with a water pipe even during operation. In extremely challenging situations, a swinging cleaning device can be installed on the sieve to automatically clean the entire screening surface at intervals. The water consumption for cleaning the sieve is 120 LPM (32 GPM) per screen plate, and the required water pressure is 70 Bar (100 psi).