conical twin screw extruder conical double screw extruder pvc double screw extruding machine twin screw extruder pvc SJZ series conical twin screw extruder SJZ series conical double screw extruder especially used for extrusion PVC powder, it has advantages as good mixing, large output, working steady , long service life time etc. equipped with series mold and auxiliary machine, it can produce ...