... ),high density polyene(HDPE) SJ-60(70)Single-Screw Double Die Film Blowing machinePerformance and Characteristics It is used for blowing ... .The machine adopts single screw to extrude the material,two die heads to blow the film.2.The screw stem and ... high hardness,strong resistance to corrosion,durable service.3.The die head is plated with hard chrome,of screw mandrel type ...