... screw extruder 1.be used to produce sheet,board,profile,pipe of pvc,pet,pet.. 2.economical prices. 3.high output. single screw ... ,such as Schneider, Yaskawa, Simens,Omron, ABS, etc...---Material of screw and barrel: 38CrMoAlA Azotizing on surface 0.40.7mm Rigidity ...