... industrial 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, good plastics. ... 2.8*6.5m HDPE High speed Film Blowing Machine