photoinitiator

photoinitiator essential component of UV inks and varnishes; depending on the type, the photoinitiator decomposes into highly reactive radicals or cations, which trigger a polymerization chain reaction in binding agents and thus ensure film formation and full hardening. Offset inks with photoinitiators that are geared to narrow-band UV sources (Excimer, LED arrays) are having trouble gaining acceptance. Photoinitiator fission products can migrate in food packaging.