4. Drying of ink:
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Drying of ink refers to the process of the ink changing from liquid or pasty to solid after the ink is attached to the printed matter on the printed matter. This process is caused by the side material in the ink from the liquid or paste. It is completed as a solid. Because the binder used in various inks and their formulation ratios are not the same, the drying process of the ink is also not the same. After the ink is transferred from the printing plate to the surface of the printing material, part of the connecting material in the ink penetrates, the solvent in the connecting material begins to volatilize, and some of the connecting materials begin to produce a chemical reaction or a physical reaction, so that the ink on the surface of the substrate is imprinted The layer gradually increases its viscosity and hardness, eventually forming a solid film layer. In general, letterpress printing inks are mainly made of permeability drying, lithographic offset printing inks are mainly dried by oxidized conjunctiva, and gravure printing inks are mainly volatile, because they use highly volatile solution as the connecting material.