The occurrence of such processes depends on the drying conditions, since during drying changes in the solvent properties due to the elimination of water limit the intensity of lipid droplet movement in the polymer matrix. Therefore, the film cross-sections confirm that the oil droplets are focused on the air side of films, indicating the lack of integrity between oil used and whey protein isolate, as well as showing that the emulsifying nature of the protein was not sufficient to stabilize oil droplets in the film- forming emulsions.