1. Use as many pictures as possible in the design of the packaging color box. For the halftone printing that does not involve the field, the shadow phenomenon usually does not occur.

        2. Use color bars placed on the cutting part other than the graphic part to transfer excess ink on the ink roller. These color bars are called ink moving bars.

        3. Adjust the packaging color box printing machine to increase the ink supply of some ink fountains that lack ink ghosts. In addition, some printing machines are equipped with slanted ink rollers, which can effectively solve the black shadow, that is, different parts of the ink roller are used to print different parts of a large area on the ground, so that the ink roller will not run out of ink.