Estimation of Coating Drying Rate on Different Base Films

Abstract

A series of computer simulations was performed for a binary Fick type coating on different base films for drying with low-temperature hot air, high-temperature hot air, and constant heat generation in the coating with low-temperature hot air, which is assumed for infrared drying. Differences in drying rate curves of the same coating on different base films were investigated under practical drying conditions of coatings from the results of the computer simulation. In a period of decreasing drying, it was found that the decrease in the drying rate due to increased heat capacity of base film increased with the increase in thermal energy required to raise the temperature of the coating relative to the total amount of thermal energy supplied to the coating.
Next, a method was proposed to estimate the drying rate of the same coating on different base films. The drying rate curve of the coating without base film was estimated by the proposed method with the simulated curve for the coating with a base film. The estimated curve showed good agreement with the simulated one, suggesting the validity of the proposed method.