conical twin screw and barrel for pp sheet extruder. it's a special design for pp sheet, based on 38CrMoAlA. conical twin screw and barrel for pp sheet extruder ... 1988, Yumin machine screw factory has worked in this field for 224years and has become the main supplier of some famous ... alloy plating: 0.03-0.08mmDepth of alloy layer:>2mmUsed for granulation,PP, PE, PA, PC, ABS,AS etcWe can manufacture ...