Explain the characteristics of each printing plate in each main printing mode.

Common printing methods are: lithography, relief printing, gravure printing, screen printing and plateless printing.

1. Lithographic printing has the characteristics of clear graphics and text, uniform pressure, bright ink color and fast ink drying, and is especially suitable for four-color dot printing. Widely used in books, newspapers, exquisite picture books, packaging and decoration.

2. There is slight indentation on the back of the printed matter printed in relief printing, the edges of lines or dots are neat, the ink in the middle is light, and the ink in relief printing is thick. Can be printed on a rough substrate. Tone reproducibility is average.

3. The inking amount of gravure printing remains relatively stable; Omitting the adjusting device; Gravure printing ink transfer is large, the product ink layer is thick, and the three-dimensional effect is strong; Gravure printing is mostly rotary printing with high speed and strong ability.

4. Screen printing is not limited by printing size and shape, with soft layout, low printing pressure, strong ink layer thickness coverage, strong light resistance and flexible printing method.

5. In plateless printing, the production process was shortened and the negative film was cancelled. At the same time, multi-color plates are automatically made and placed on the plates without correction or consideration of ink balance. Eliminates plate making, ink control and other links. It also avoids the problems of storage, abandonment and recovery of plates.