The single screw extruder, with its diverse screw size from 45mm to 150mm,is mainly for polyolefin plastic extrusion. Welican SJ series single screw extruder, with its diverse screw size from 45mm to 150mm, is mainly for polyolefin plastic extrusion. Feature:Various application for HDPE,PPR,PP,PB etc.Barrier screw and grooved feeding bushHigh throughput homogenous melting, high plasticization ...