High-output compounding with high wood content.
Entek Extruders, Lebanon, Ore., got its start in building twin-screw extruders for its own processing of highly filled compounds for battery separators (50% silica, 14% oil, 20% UHMW-PE, and the rest additives and colorant). Now it is applying that experience to twin-screw design for processing high filler loadings in wood-plastic composites (WPCs). The firm recently demonstrated new screw and processing technology with two vacuum vents for 25% higher output of WPCs. A modified 53-mm twin-screw lab line extruded 1600 lb/hr of 60% wood-filled HDPE into 1 x 4 in. decking at 600 rpm. Before modification, the line could produce only 1200 lb/hr of WPC profiles at 400 rpm. The demonstration used undried, precompounded material containing 60-mesh wood flour with 4% to 12% moisture plus 4% additives and colorant. Tel: (541) 259-1068 * PTDirect: 151VT