By i. H. Nobhs, S. A. Orton and P. K. T. Oldring, University of Leeds, Thomas Swan & Co - RadTech Europe Conference 1989
The effect of substrate reflectance and surface roughness on the curing properties of a commercial ink and a clear lacquer on an aluminium foil laminate were studied. The cure times recorded by a UV N1O1 Cure Tester on polished foil were significantly less than those for layers on foil overprinted with a black layer. The UV absorption spectrum of the clear lacquer and its constituents were measured and used to interpret the results using a two--flux optical model. The abraded foils showed a change in the amount of transferred with change in roughness. The cure time (after thickness correction) increased with increasing roughness.
Cure assessment by FTIR reflectance measurements of the coated foil was unsuccessful doe to the high level of regularly reflected light from these samples. Transmission FTIR measurements on cured films stripped from the substrate were of value.