Why do inks have different degrees of dryness?

Like other surface coating materials such as paint, the ink also has a process of changing from the liquid state to the solid state. This process is called drying in a broad sense. In an ideal state, the printing ink should be stable in the container or on the ink fountain or the ink roller of the printing machine. When the ink is transferred from the printing plate to the surface of the printing material (such as paper, etc.), the ink is converted into the body film. There are physical ways to promote ink drying. There are also chemical ways. The way the ink is dried is determined by the type of ink. That is, it is determined by the ink binder and its formula. In most cases, the ink has two or more dry forms. For example, after the ink is transferred from the printing plate to the surface of the paper, some of the ink in the ink penetrates into the fibers of the paper. At the same time, the solvent in the ink starts to evaporate, and the binder on the surface of the paper begins to undergo chemical and physical reactions. The viscosity and hardness of the surface ink film are continuously increased, and the drying process is finally completed to form a solid film layer. In this process, there is the chemical action of the oxidized conjunctiva and physical effects such as infiltration and volatilization. However, due to the different types of binders and formulas in the ink, the ink is also dominated by a dry form to complete its drying process. Different printing methods must choose different ink types to suit different types of printing plates and substrates. Newsprint printing Because newsprint paper has loose paper and high printing speed, it uses inks that are mainly osmotic and dry; for offset and coated paper printing, resin-based inks that are mainly dried by oxidized conjunctiva are used; for non-absorbent gravure printing methods, Volatile drying dominates.