... twosets main motors, two cylinders and one layer die head, feeding by two cylinders. Extruding with one die head one traction and rewinding device ... improve the quality of striped film by adopting with one traction and one rewinding device.2. The screw stem and cylinder ... finishing and nitrided treatment, which has high hardness,strong resistance to corrosion, durable service.3. The die head is plated ...