plastic extruder for pvc pipe Screw and barrel made of nitrided 38CrMoALA wear resistant, corrosion resistant, high strength plastic extruder for pvc pipepvc drainage pipe making machineApplication ... ,45kw,55kw SJ-120HY120mm25:1 30-90r/min1000mm 250kg/h75kw pvc drainage pipe making machine/plastic extruder for pvc pipe