1. The color original is processed into monochrome by electronic color separation, and then a film (negative film) is produced;
2. Back exposure: Expose the back of the plate with ultraviolet light to form the corrugated cardboard box printing plate base;
3. Main exposure: remove the protective film on the front of the corrugated cardboard box plate, put on the negative picture, cover the vacuum film, after vacuuming, perform the main exposure with ultraviolet rays, and transfer the content of the negative picture to the printing plate;
4. Washing the plate: Wash the plate with water in the plate washer to wash off the unexposed resin on the printing plate to form a concave and convex printing plate.
5. Drying:
6. De-sticking: UV light source irradiation;
7. Post exposure: hardness adjustment.