EFFECT OF FEED CONSTRUCTION ON THE EFFICIENCY OF PRESSURE SCREENING

High-speed video recording provided a study of pressure screening. The study evaluated the effects of feed direction and existence of feed c hamber using long fiber yield and shive removal efficiency. Feed direc tion influenced partial distribution in the radial direction of the sc reen basket. When using tangential feed direction, solid material conc entrated near the screen surface. The feed chamber seemed to function as a potential fluid volume for backflow. This detrimental effect was more pronounced for axial feed construction. The feed construction see med to have a slight effect on shive removal efficiency. Selection of feed construction should use factors other than screening efficiency, however, such as energy savings or maintainability.