When ink is exposed to UV light, it begins a chemical reaction that causes the ink to dry. Photoinitiators, which are substances that absorb UV light and start the chemical reaction that causes the ink to harden or cure, are present in the ink used in this method.
The process is initiated when the photoinitiators in the ink absorb UV light after being applied to a substrate like paper or plastic. The name of this procedure is photopolymerization.
The photoinitiators disintegrate into free radicals during photopolymerization, which are extremely reactive species that can start chemical reactions. After then, the ink's molecules undergo a reaction with the free radicals that causes them to crosslink and create a web of polymer chains. The firm and long-lasting qualities of the cured ink are provided by this network of polymer chains.
High-quality prints with outstanding adhesion and durability may be produced quickly and effectively using UV curing. In the printing industry, it is frequently used to create wall prints, labels, packaging, and other printed goods.