... 9001:2008 3.Rapidly replace the screen, simple operation Protein powder Airflow screen WSA series Airflow screen principle is feed ... the screw shaft. It is especially suitable for screening resin powder (PVC, epoxy), glass beads, quartz sand, light calcium ... carbonate, aluminium hydroxide and the like powder materials. Features:No oversize end bearings or sealsHinged oversize end ...