Once parameters for a low migration printing process are established, the most critical variable remaining is curing. Despite challenges for ink formulators, UV LED is the key curing technology eliminating this vulnerability.
UV inkjet made tremendous progress in productivity and print quality in recent years. Market penetration in graphic arts picks up speed making traditional UV offset and UV flexo face increased competition from UV inkjet, particularly in label and packaging printing.
The present work addresses the formation of 3D structures via UV assisted foaming of commercially available acrylic offset inks. The microcellular foaming relies on the excitation of selected photoacid generators with UV light to release Brønsted acids.