... design for extruder, based on 38CrMoAlA. conical twin screw and barrel for plastic extruder, granulator or pelletizer Ruian Yumin machine screw ... co.,ltd is a factory specialized in making screw barrel, filter, mould, gearbox and recycling machine. Founded in 1988, Yumin ... customers)L/D ratio of screw: 16-35Conical dual-hole barrel screw specificaiton: Φ25Φ45-Φ92Φ188(according to the demands ...