Patent ID: 6119867
Filing Date: 2000-09-19
Classification: B01D,D21D

Abstract:
A screen cylinder including a rotationally symmetric screen surface located on a side of the screen having pulp to be screened, and support rings supporting the screen surface on an opposite side thereof, the screen surface being mainly formed of grooves and of screen apertures located in connection with the grooves, the grooves in turn including an upstream side surface, a bottom surface, and a downstream side surface,wherein the bottom surface of the groove rises towards the upstream side surface, and the screen apertures are located substantially near a junction of the bottom surface and the upstream side surface, wherein an inclination angle a of the bottom surface is about 5-30 degrees and an inclination angle .beta. of the upstream side surface relative to a level perpendicular to the screen surface is about 0-15 degrees.