As a venue to improve the wettability of inks in the print industry, printers utilize surface-treatment technologies. These technologies allow adhesion of inks to plastics, polymers, films, and flexible packaging. Many treatment processes occur before substrates leave the factory, but further processing becomes a necessity due to a combination of uneven surface treatment and the limited longevity of the initial treatment. Popular processes today include corona, atmospheric plasma, cold gas plasma, and plasma-grafting treatments. How do these different treatments compare, what seems to be the best, and what is the future moving towards?