Screen

Screen for cleaning a pulp suspension flowing therethrough, the screen comprising:

• an infeed branch adapted for receiving an infeed flow of pulp suspension;
• a rotatable rotor having a driven end and a free end;
• a screen basket fixedly disposed within an infeed area between the infeed branch and the free end of the rotor, the screen basket defining a pre-screening area;
• a plurality of rotating blades disposed in the infeed flow;
• and
• a double-conical accept chamber associated with the screen basket having an upstream section which widens in the flow direction of the pulp suspension and a downstream section which narrows in the flow direction of the pulp suspension.

Screen for cleaning a pulp suspension comprising:

• an infeed branch adapted for receiving an infeed flow of pulp suspension;
• a rotatable rotor having a driven end and a free end;
• a first screen basket fixedly disposed within an infeed area between the infeed branch and the free end of the rotor, the first screen basket defining inner and outer cavities;
• a second screen basket disposed between the first screen basket and the driven end of the rotor, the second screen basket defining inner and outer cavities;
• a first set of rotating blades disposed intermediate the infeed branch and the first screen basket;
• and
• a second set of rotating blades disposed within the inner cavity of the second screen basket;
• wherein the inner cavity of the second screen basket is in fluid communication with the inner cavity of the first screen basket and no component of the screen is disposed between the inner cavities of the first and second screen baskets.