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Centrifugal cleaners are used to remove contaminants of fiber size or smaller that remain in the OCC pulp slurry after screening. They use rotational motion and centrifugal force to remove contaminants whose density or specific gravity differs from the wetted pulp fibers. Forward cleaners remove contaminants that are heavier or more dense than pulp fibers, such as sand, glass, and metal fragments.
Reverse cleaners remove contaminants that are less dense or lighter than the fibers, such as waxes, plastics, and hot melt adhesives. In both cleaner types, the pulp slurry is fed into the cleaner tangentially or roughly parallel to the wall at the point of entrance near the top. Once inside, the fluid pressure created by the cleaner supply pump is converted to rotational motion as the slurry forms a vortex.