Before pulp can be formed into strong, smooth paper, it must be purified. The slurry, whether from recycled materials (OCC, ONP) or virgin wood, contains unwanted contaminants: shives, knots, plastics, adhesives, and oversized fiber bundles. If these pass through, they cause web breaks, defects in the final sheet, and downtime. The Inflow Pressure Screen acts as a high-capacity, intelligent filter, continuously separating “accepts” (good fibers) from “rejects” (contaminants). The Inflow design of the Inflow Pressure Screen is a specific and highly effective screening mechanism where the pulp slurry is fed tangentially into the screen cylinder. This creates a rotational flow that is key to its performance.

 

The Core Advantages of Inflow Pressure Screen

1. The patented inflow design creates a stable, rotating vortex inside the screening chamber. This rotation uses centrifugal force to hold contaminants against the screen plate while allowing accepted fibers to pass through perpendicularly with minimal force. This gentle treatment preserves fiber length and strength, a crucial factor for producing high-strength kraft paper.
2. The combination of tangential inflow and a precisely balanced reject rate ensures that contaminants are efficiently carried to the reject outlet without frequent plugging of the screen perforations. Leizhan screens feature high-precision, wear-resistant screen baskets (with slot or hole profiles) tailored to the specific pulp grade, ensuring the highest possible accept quality.

 

In the modern paper mill, where every percentage point of efficiency and quality translates to competitive advantage, the pulping stage cannot be a weak link. The Leizhan Inflow Pressure Screen is not merely a piece of equipment; it is a strategic investment in process purity and operational excellence.
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