The compound must have a certain strength, plastic film printing ink must be stable after, otherwise, will lose value. Improper surface polarization will adversely affect the quality of the film and even cause waste products. The surface polarization printing plastic film strength is not enough when ink firm or composite strength is not up to the requirements, there will be the following problems: through the surface of the film, the film after 1 folds; and adhesive film between layers, especially the blown barrel material inside the adhesion is not easy to separate; 2 and reduce the barrier film, the film preservation performance is poor; 3, reducing the welding performance of the film, the film welding fastness decreased.