Patent ID: 8950584
Filing Date: 2015-02-10
Classification: B07B,D21D

Abstract:
1. In a screening device, a rotor element on 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 relative to the other, wherein the rotor element protrudes outward from a surface of the rotor and towards the screen drum, the rotor element comprising: an upper surface and a front face between the surface of the rotor and the upper surface, wherein the front face faces upstream into the pulp flow in the gap; a trailing surface extending downstream of the pulp flow from the upper surface, wherein the trailing surface tapers to the surface of the rotor and meets the surface of the rotor at a back region of the trailing surface, and opposite sidewalls extending between the trailing surface and the surface of the rotor, wherein the opposite sidewalls gradually converge towards the back region.