After washing, the pulp contains uncooked shives that need to be removed before the pulp can be used for kraft paper making or in the bleaching section to produce white grade papers. This removal process is accomplished through a three-stage screening process.

1. Primary Screening:

   • In the primary stage, a centrifugal screen is used to separate the acceptable pulp from the rejects.

2. Centricleaning System:

   • The accepted pulp from the primary screen undergoes further cleaning in the centricleaning system to remove any remaining impurities.

3. Thickening:

   • The cleaned pulp from the centricleaning system is then thickened in a vacuum thickener. This increases the pulp consistency to around 10%, making it suitable for storage in the high-density tower.

4. Secondary Screening:

   • The rejects from the primary screen are processed in the secondary screen to recover any usable pulp. This ensures maximum recovery of fibers and minimizes waste.

The result is clean, high-consistency pulp ready for kraft paper production or further bleaching processes.