The three principles of offset printing are as follows: 1. The principle of water-oil incompatibility is determined by the so-called similar compatibility principle in chemistry. The structure of light polar water molecules is different from that of non-polar oil molecules, resulting in water. The oil cannot be attracted and dissolved. The existence of this rule makes it possible for the planographic printing plate to use water to distinguish between text and blank parts. Second, the principle of surface selective adsorption, according to the difference in surface tension, it can adsorb different substances, which also provides the possibility of graphic and text separation of offset printing. 3. The dot constellation principle. Because the offset printing plate is flat, you cannot rely on the thickness of the ink to express the level of graphics on the printed matter, but by splitting the different levels into tiny dots that are imperceptible to the naked eye The unit can effectively express the rich image hierarchy.
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