Contaminant Removal
Pulp suspension flows through this heavy gauge stainless steel cylinder to separate oversized debris from usable wood fibres. A slotted screen basket relies on precisely machined longitudinal openings to permit the passage of acceptable stock while blocking shives, plastic fragments, and undissolved coating particles. Proper slot geometry determines the capacity of the screening operation and the efficiency of the stock cleaning circuit.
These components require periodic inspection to ensure that the slot width remains within specified tolerance levels, as any variance affects the downstream brightness and strength properties of the finished paper sheet.
Flow Restriction
Pressure drops across the unit characterize the operational load of the system and indicate the presence of clogging or blinding within the metal frame. Higher differential pressure readings suggest that the apertures collect excessive rejects, which necessitates an increase in the reject rate to prevent long term degradation of the fiber quality. Operators monitor these performance metrics to verify that the internal fluid dynamics maintain consistent throughput without causing fibre damage or excessive energy loss.
Manufacturing Consistency
Dimensional accuracy of the internal slots governs the final product uniformity by controlling the maximum particle size permitted in the pulp feed. Small deviations in slot width alter the distribution of fine particles and heavy contaminants within the slurry, forcing adjustments in the subsequent bleaching and refining sequences to maintain sheet integrity. Consistent slot dimensions ensure that the output of the screening process meets the requirements for high speed paper production.
