Effect of Coating Application Temperature on End-Use Performance Properties of Paper, 1994 Coating Conference Proceedings

C. E. Miller, N. G. Triantafillopoulos, J. E. Carmichael

This work addresses the effects of coating application temperature on end-use performance properties of paper. The hypothesis was that raising coating color temperature at application could increase drying capacity in dryer-limited situations. Three independent variables were studied, i.e., coating temperature, coat weight, and type of styrene butadiene latex, in a series of statistically designed experiments. Results suggested that the coating application temperature substantially influences performance properties of a coated paper related to coating structure and consolidation. Initially, ink receptivity and porosity decreased, while gloss and ink gloss remained constant, with raising temperature. At 35-37 degrees Celsius, paper and print gloss, and to a lesser extent Croda receptivity and porosity, show shifts in the data trends. Above this critical temperature range in the laboratory coater, the effects of raising coating application temperature are similar to those expected from increasing drying rates. These results suggest that one can simulate the high drying intensity environment of a production coated by raising the application temperature of a coating color in dryer-limited laborator or pilot plant.