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Improving Properties of UV Flexo Inks By Curing Under Nitrogen

Low odor and extractables levels can make UV flexo a more attractive option for a variety of markets

By: Bonnie Bedolla

Flint Ink

Editor’s Note: “Improving Properties of UV Flexo Inks By Curing Under Nitrogen” received a Carroll Scientific honorarium at the National Printing Ink Research Institute’s Annual Technical Conference in 2002. Oxygen inhibits the free-radical curing of UV flexo inks. When UV flexo inks are cured in an environment with abundant oxygen, such as ambient air, the oxygen reacts with free radicals from the photoinitiator (PI) and growing polymer chains to form peroxy radicals. (Walia, 2001) Peroxy radi...

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