Patent ID: 8011515

Claim:
A device including a hollow body defining axially extending compartments therein for receiving a slurry of pulp fibers in a carrying slurry and provided with a slurry inlet and a slurry outlet; first and second stationary coaxial annular screening screens disposed within said body; with the second screen disposed generally radially outwardly of the first screen, a rotor within the body and positioned between the screens to conduct the slurry through said first screen and then through said second screen, said rotor being driven in rotation, and a pipe coaxial with and radially inward from said first screen, said rotor being closed at one end and open at the other end, so that slurry passing through said first screen passes axially along said housing, between said pipe and the first screen, and then around said rotor at its open end to pass axially along said housing between the outer surface of the rotor and the second screen.