Apparatus for screening fibrous suspensions

A rotor element for a screening device including a rotor coaxial with a cylindrical screen drum, wherein a gap between the rotor and screen drum receives a pulp flow and at least one of the rotor and screen drum rotates, wherein the rotor element extends from a surface of the rotor into the gap and towards the screen drum, the rotor element comprising:

• an upper surface facing the screen drum;
• a front wall extending from the surface of the rotor to an edge of the upper surface of the rotor element, wherein the front wall faces into a direction of circumferential flow of the pulp flow in the gap;
• a trailing surface facing the screen drum and extending downstream of the upper surface in the direction of circumferential flow, wherein the trailing surface tapers from the upper surface towards the surface of the rotor, and
• opposite sidewalls extending from opposite edges of the trailing surface to the surface of the rotor, wherein the opposite sidewalls converge in the direction of circumferential flow at a back end of the rotor element.