conical twin screw and barrel for extruder. it's a special design for extruder, based on 38CrMoAlA, large output conical ... twin screw and barrel for plastic extruder Ruian Yumin machine screw co.,ltd is a factory ... 45/100, 50/105, 55/110, 60/125, 80/143, 80/156, 92/188, 95/188Material: 38CrMoAlA high quality alloy ... conical twin screw barrel 38crmoala for plastic extruder