Photochemical reaction in three different water-developable flexographic printing plates was characterized. The distribution of photochemical reaction in the direction of thickness was evaluated by utilizing 13C NMR and IR (ATR) measurements, and the results obtained showed that the distribution of reaction as well as the overall reaction in the printing plates depends on the plate compositions. 1H NMR analysis for soxhlet extracts of exposed samples showed that the reactivity of monomers depends on its structure and molecular weight in relating to a specified phase condition of the composition.
Abstract Photochemical reaction in a flexographic printing plate was characterized. The distribution of photochemical reaction in the direction of thickness was successfully understood by the combination of overall reactivity obtained by 13C NMR measurement and reactivity near the surface obtained by ATR FTIR spectroscopy.
