Overview
After the cleaning operation, there are still some impurities and contaminants left in the mixture which make it inconsistent. The screening process removes foreign materials such as dirt, brick pieces, and cement to improve pulp quality.
Screening focuses on several key parameters: production capacity, operating capacity, working efficiency, power consumption, and fiber loss.
Two Main Screening Categories
Coarse Screening
This initial stage removes heavier particles including fibers, knots, shives, dirt, and sand—which comprise approximately 2-3% of the total mixture. The accepted stock then proceeds to fine screening.
Equipment options include:
- Turbo Separator - Features a disc screen designed for high trash and flake content with separate removal of heavy and light rejects
- Medium Consistency Screen - Uses specially designed rotors with hole and slot configurations for effective contaminant separation
- Horizontal Pressure Screen - Avoids string formation while providing easy access to components
- Reject Screen - Fully automatic system for waste paper and broke screening with minimal fiber loss
- Reject Sorter - Final coarse screening stage with hardened sweeping blades for fiber bundle disaggregation
- Slotted Vibrating Screen - Open design system for chemical pulp, groundwood, and waste paper processing
Fine Screening
This secondary stage removes fibers that are not sufficiently coarse, further refining pulp quality.
Primary equipment:
- Low Consistency Screen - Delivers improved screening efficiency with lower power consumption
- Reject Screen - PLC/timer-controlled washing cycle minimizing fiber loss in discharge
Need Pulp Screening Equipment? Contact Parason today.
