... ,hign efficiency 4.time and money saving Automatically film blown machine Features:1, screw extruder, spiral tube-based company2, by matching ... materials, multi-channel by heat-treatment process after deformation to a minimum. 5, traction roller, roller coiling Balancing all of detection ... 45 mm65 mm75 mm80 mmscrew ratio L/D 30:1L/D 30:1L/D 30:1L/D 30:1screw speed 10-130 r/min10 ...