For blowing high-low pressure polyethylene, the product is widely used in composite film, packaging film, agricultural covering film, textile, garment bag or film packaging; main motor using VVVF, an increase of host control stability, and can saving 30%, the screw and barrel by 38 of chromium, molybdenum, aluminum, after nitrogen treatment, the traction frame mining lifting type, no matter blow large and small size film can make the best effect of cooling;