Periodical reject separator type OS-4U

The periodical reject separator type OS-4U is designed for continuous removal of heavy reject from waste paper without fiber loss and pulper downtime.

The separator type OS-4U can be installed after on almost any pulper: vertical or horizontal with a volume of up to 50m3. The drive energy consumption is 45 kW. The volume of the vat t is 4.0 m3.

The OS-4U operates periodically in both manual and automatic modes. Each cycle consists of feeding the contaminated pulp from the primary pulper, desintegrating the pulp , returning the sorted pulp to the primary pulper, washing of reject and discharging waste.


  • Elimination or significant reduction in the number of  periodical  cleaning;
  • High quality of the accepted pulp;
  • Reducing wear of pulper units;
  • Additional desintegration.