... on 38CrMoAlA, large output conical twin screw and barrel for plastic extruder Ruian Yumin machine screw co.,ltd is a factory specialized ... 224years and has become the main supplier of some famous plastic machine and package machine factories in Wenzhou area and other ... our customers.size: 35/75, 45/90, 45/100, 50/105, 55/110, 60/125, 80/143, 80/156, 92/188 ...