... high density polyene(HDPE) SJ-60(70)Single-Screw Double Die Film Blowing machinePerformance and Characteristics It ... 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 ... die head is plated with hard chrome,of screw mandrel type structure with even and smooth discharging ...