The film thickness increased from 0.0166 (±0.0003) mm
for the 5% WPI film to 0.0232 (±0.0012) mm for the 7%
WPI film and to 0.0447 (±0.0003) mm for the 9% WPI film
(Fig. 1). The difference in thickness was significant
(p < 0.05) in all comparisons of films made from the different
concentrations of WPI. This behavior is as a result of
the protein concentration of WPI solution, when the concentration
was high. The WPI-based film thickness values
were lower than those reported by Vachon, Yu, Yefsa,
Alain St-Gelais, and Lacriox (2000) with thicknesses of
0.05 to 0.06 ± 0.002 mm for the same material but crosslinked
by heating and irradiation. However, the values
were much higher than those reported by Simelane and
Ustunol (2005) who noted a thickness value of
0.14 ± 0.02 mm. This was due to differences in film-forming
solution formulations and procedures used.
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 filmforming
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.
The film thickness increased from 0.0166 (±0.0003) mmfor the 5% WPI film to 0.0232 (±0.0012) mm for the 7%WPI film and to 0.0447 (±0.0003) mm for the 9% WPI film(Fig. 1). The difference in thickness was significant(p < 0.05) in all comparisons of films made from the differentconcentrations of WPI. This behavior is as a result ofthe protein concentration of WPI solution, when the concentrationwas high. The WPI-based film thickness valueswere lower than those reported by Vachon, Yu, Yefsa,Alain St-Gelais, and Lacriox (2000) with thicknesses of0.05 to 0.06 ± 0.002 mm for the same material but crosslinkedby heating and irradiation. However, the valueswere much higher than those reported by Simelane andUstunol (2005) who noted a thickness value of0.14 ± 0.02 mm. This was due to differences in film-formingsolution formulations and procedures used.At the same protein concentrations, films prepared witha different ratio of plasticizer showed different values inthickness. The thickness increased slightly when the glycerolamount was increased in film-forming solution. GenerallyWPI:Gly ratio did not significantly affect the filmthickness.Thickness affects the drying kinetics of the liquid filmformingdispersion, which may cause differences in filmstructure (Debeaufort & Voilley, 1995). A high film thicknessproduces an increase in WVP. Therefore, control ofthis parameter is crucial.
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