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According to the composition of the ink, the drying method can be divided into physical drying, chemical drying, and the integrated application of these two methods. Different inks and coating oils require the use of different drying systems or a combination of several drying systems for optimum drying. If an infrared and ultraviolet drying system is installed on a printing press, it can basically satisfy all the needs of printing and is therefore very useful.
Taking into account its drying performance, the composition of the printing ink must meet the following two contradictory requirements: First, the ink cannot be dried on the ink roller when the printing machine is printing or shut down briefly; first, after the printing is completed, the printing material The ink needs to be quickly dried and fixed.
Some of the most important factors affect the ink drying performance: 1 ink composition (ink pigments, binders and related additives); 2 substrate material properties (such as permeability, etc.); 3 printing conditions (ink transfer volume, received Paper stack height, printing speed); 4 climatic conditions (indoor temperature, humidity); 5 drying system components (such as ink surface air flow, reaction time, type of energy supplied, etc.). Temperature is a decisive factor. In general, the higher the temperature, the better. Because the higher the temperature, the faster the ink polymerization speed, the smaller the ink viscosity, the more conducive to penetration, the faster the solvent evaporation.
The drying process includes all processes after ink transfer. In these processes, ink curing is the primary condition for post-press processing, and it is also a prerequisite for prints to be used in everyday life.