According to the Dongguan color card plate image part and no image part in the printing process, the principle of printing products, can be divided into physical printing (Physical Printing) and chemical printing (ChemicalPrinting) two.
Dongguan Physical printing color card, printing ink in the printing part is a bearing part image without accumulation, indentation or bulge with different height and not part of image stained with ink, the ink part blank, so image transfer to the printed material, only physical mechanical action. General letterpress, gravure printing, hole plate printing, dry plate printing, etc., all belong to physical printing (the printing surface is higher or lower than the non printing surface).
Dongguan chemical printing color card printing plate, no printing part (non printing surface) is not stained with ink, not by the low-lying, convex, or blocked, is due to the chemical reaction, the water refuse ink film. Of course, the image part (printing ink surface) water repellent, non image areas of water and oil repellent water ink, each backwash is still the physical phenomenon, but in the printing process, must continue to make part of the image without water so as to refuse ink film, chemical printing. The printing of a flat rubber printing machine belongs to this kind. It is necessary to add class and gum substances into the solution of the flask so that the mucous layer of carboxyl group will be supplied, so that the non print part of the printing plate will not be infected by grease.