Principle knowledge of printing
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According to the principle of printed matter, there are two types of physical printing and chemical printing. Physical printing, printing ink in the printed part is a kind of stacking load, the non-printed part is concave or convex, and the height of the printed part is different from the ink, leaving it blank, so the printed part is printed. The ink is transferred to the printed material and is only a physical and mechanical effect. General relief printing, gravure printing, stencil printing, dry lithography, etc., are all physical printing (printing surface is higher or lower than the non-printing surface). In chemical printing, the unprinted portion (non-printing surface) of the printing plate is not stained with ink and is not concaved, raised, or blocked by the portion. It is due to a chemical effect that produces a film that absorbs ink and resists ink. As it happens. Of course, the ink-printed part (printing surface) absorbs ink and resists water, and the unprinted part absorbs water and resists ink. Water and grease counteract each other. It is still a physical phenomenon. However, in the printing process, the unprinted part must be continuously refilled with water. Ink film, it is chemical printing. The printing of lithographic printing presses is such. In the gutter solution, it is necessary to add substances and glues to enable the source to supply the mucus layer of the carboxyl group, so as to keep the non-printed surface of the plate from being infiltrated by grease.