This unit extruder, the machine barrel, screw all adopt high quality alloy steel, and it has the best hardness and corrosion resistance, and the special design of the screw output is high, and it has good plastic. Suitable for blowing low density polyethylene (LDPE), high density polyethylene (HDPE), linear low density polyethylene (LLDPE) and other plastic film, widely used in food, clothing, garbage bags, vest bags and other civilian and industrial packaging.