... packing. SJ-A50,55,60,65 High Speed Blowing Film MachineUse characteristicsThe unit extruder, barrel, screw adopt high-quality steel, nitride tight handling and ... precision machining, with the best hardness and corrosion resistance, a specially designed screw high yield ... *2.5*5.5m5.8*2.8*6.5m HDPE High speed Film Blowing Machine