Three layer coextrusion blown film line in the model has the advantages of high efficiency and low energy consumption of the extruder, IBC film bubble cooling system, + 360 degree horizontal traction rotation system, photoelectric automatic correction device, automatic collection film roll and tension control, computer screen automatic control systems and other advanced technologies. Compared with the similar equipment, the product has the advantages of higher yield, good plastic and plastic operation, low energy consumption and convenient operation, completely solving the problem of the thin film lotus leaf edge and the rolling size, and the product quality is a new step. The film produced with high transparency, high toughness, resistance to puncture, combined with good fastness, low temperature and high temperature, anti curl. Mold of the unit, in addition to a reasonable flow of the design. The main parts are used processing equipment, ensure the channel high accuracy and good precision surface roughness, die provided strong interchangeability, small resistance, material flow, uniform temperature distribution, stable rotation of the body of the mould, sealing well. Machine screw and barrel, and nose channel for low temperature of EVA adhesive with special design and manufacture, the head according to the EVA to LDPE, HDPE, LLDPE, EVA, EAA and regeneration of mixed material in the head at different temperature in the die channels produced by pressure, accurate calculated their gap of flow. Make use of special equipment to achieve the design accuracy. The decomposition phenomenon of the machine head and the channel is eliminated, and the different temperature is in the plastic. And improve the accuracy of different raw materials. Improve the physical properties of plastic products. 0.03-0.05 of the thickness of the blowing mucosal products can be up to twenty percent EVA.