... winder 2 Rotary die head 3 Auto loader 4Double lip air ring 5Air shaft. Single screw double die Film ... industrial products etc. 1, The machine adopts single screw to extrude the material, two die heads to ... blow the film. 2, The screw stem and cylinder are made of 38CRMOALA high quality ... durable service. 3, The die head is plated with hard chrome, of screw mandrel type structure with even and ...