conical twin screw and barrel for pp sheet extruder. it's a special design for pp sheet, based on 38CrMoAlA. conical twin screw ... barrel for pp sheet extruder Ruian Yumin machine screw co.,ltd is a factory specialized in making screw barrel, filter, mould, gearbox ... : 0.03-0.08mmDepth of alloy layer:>2mmUsed for granulation,PP, PE, PA, PC, ABS,AS etcWe can manufacture various kinds ...