Patent ID: 7296684

Claim:
A screen for cleaning a fiber suspension, the screen comprising: a housing; a rotor disposed within the housing; a screen basket disposed between the housing and the rotor, the screen basket defining a plurality of separation units, the rotor extending axially through all of the separation units, the rotor including a rotor segment disposed within each of the separation units, each rotor segment extending axially from an area of minimum rotor diameter to an area of maximum rotor diameter and defining a substantially parabolic shape adapted to the flow conditions in the associated separation unit; an accept chamber disposed between the screen basket and the housing; a reject outlet disposed adjacent the area of maximum rotor diameter of at least one of the rotor segments; and at least one device for interrupting axial flow disposed adjacent the area of maximum rotor diameter of one of the rotor segments, the at least one device for interrupting axial flow comprising at least one axial flow interruption ring.