At the same protein concentrations, films prepared with
a different ratio of plasticizer showed different values in
thickness. The thickness increased slightly when the glycerol
amount was increased in film-forming solution. Generally
WPI:Gly ratio did not significantly affect the film thickness.
Thickness affects the drying kinetics of the liquid film forming
dispersion, which may cause differences in film
structure (Debeaufort & Voilley, 1995). A high film thickness
produces an increase in WVP. Therefore, control of
this parameter is crucial.