Flexographic  printing machine plate is a letterpress with a soft texture. When printing, the printing plate is in direct contact with the plastic film, and the printing pressure is light. Therefore, the flatness of the flexographic plate is required to be higher. Therefore, attention should be paid to the cleanliness and flatness of the plate base and the plate cylinder when installing the plate, and the flexographic plate should be pasted with double-sided tape. Flexographic printing plastic film, because its surface is non-absorbent, the mesh line of the anilox should be thinner, generally 120~160 lines/cm. The printing tension of flexographic printing has a great influence on the overprinting and image transmission of plastic films. The printing tension is too large. Although it is beneficial to the accurate color registration, the shrinkage rate of the film after printing is large, which will cause dot deformation; on the contrary, if the printing tension If it is too small, it is not conducive to the accurate color registration, the image registration is not easy to control, and the dots are easily deformed and affect the product quality.