How to Choose Pressure Screen Basket Slot Size for Different Paper Grades | Leizhan
Pressure Screen Basket Slot Size Is the Critical Decision in Stock Preparation
The slot size of a pressure screen basket determines the balance between pulp cleanliness and fiber loss. For OCC pulp producing kraft linerboard, 0.20-0.35 mm slots deliver optimal results — narrower slots improve contaminant removal but reduce throughput by 10-15%.
Leizhan Pressure Screen Series
| Model | Capacity (TPD) | Slot Size (mm) | Motor (kW) | Fiber Recovery |
|---|---|---|---|---|
| MZS-400 | 80-150 | 0.15/0.20/0.25/0.30/0.35 | 45-75 | >95% |
| MZS-600 | 150-300 | 0.15/0.20/0.25/0.30/0.35 | 75-132 | >95% |
| MZS-1000 | 500-800 | 0.25/0.30/0.35/0.40/0.50 | 200-315 | >96% |
Slot Size Recommendations by Paper Grade
Kraft Linerboard (OCC): 0.25-0.35 mm. Corrugated Medium: 0.30-0.40 mm. Coating Board: 0.20-0.30 mm. Cultural Paper: 0.15-0.25 mm. Each grade demands a different balance of cleanliness versus throughput.
FAQ
Can one screen handle multiple paper grades?
Yes, by changing the basket. A mill can run 0.35 mm for linerboard and swap to 0.25 mm for coating board. Basket change takes 2-3 hours.
What is typical fiber loss in a pressure screen?
Under normal conditions, 3-5%. If fiber loss exceeds 8%, check for basket damage, improper slot size, or excessive reject rate.
How much energy does a pressure screen consume?
A mid-size screen (MZS-600) consumes 3-6 kWh/t of screened pulp. Larger models consume 5-8 kWh/t.