In life, we have this common sense: On a surface wetted by water, it is not easy to be contaminated by oil, and water and oil are always mutually exclusive. Because the printing plates of offset printing are almost on the same plane, then we need to find a method that can effectively distinguish the blank part from the graphic part. The role of water in offset printing is called the principle of "water and oil are not miscible". In the printing process, first apply a thin layer of water evenly on the surface of the printing plate (in fact, due to the selective adsorption on the surface of the printing plate, the graphic part will not be wet), and then apply on the printing plate When the ink is used, the blank part is effectively protected.
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