... plastic machine 1.produce pipe,profile,sheet,board...of pcv,pp,pet,pp...etc 2.Excellent quality 3.economical prices. single screw ... select us?---More than twenty years experiences in plastic extrusion, with advanced technology---All the important electrical elements use ... as Schneider, Yaskawa, Simens,Omron, ABS, etc...---Material of screw and barrel: 38CrMoAlA Azotizing on surface 0.40.7mm Rigidity ...