PVC heat shrink film blowing machine pvc film blowing machine, pvc film extruder,film blowing machine PVC heat shrink film blowing machinepvc film blowing machine, pvc film extruder, film blowing machine/film extruding machine Features the unit is ... key parts, screw and barrel adopt 38CrMoAIA quality alloy steel, finished ammonification, high hardness, wear resistance, corrosion resistance and ...