The effects of drying temperature, drying relative humidity and film thickness on the drying characteristics, water vapor permeability, and tensile properties of glycerol (Gly)-plasticized whey protein isolate (WPI) films were investigated. 50% WPI:50% Gly and 60% WPI:40% Gly (dry basis) films were studied. Constant rate periods were compared among films. A higher temperature (95C) and lower relative humidity (30%RH) increased the slope of the weight versus time plot during the constant rate period, indicating shorter drying times to reach the falling rate period. Water vapor permeabilities were significantly lower for films dried at 95C and 30%RH than for films dried at 21C and 50%RH. Films dried at 95C and 30%RH were generally thinner, stiffer, stronger, and less extendable than films dried at 21C and 50%RH.

Drying rate effect on the properties of whey protein films

The paper presents the results of an investiga- tion into thermoradiation drying and film formation of a two-component solution having substantially dif- ferent boiling temperatures of the components, and being applied to a substrate under the conditions of matching the spectral emissive characteristics of the radiator with the spectral thermoradiative properties of the object of drying. The film transmissivity is found to,increase with a decrease in the mass of the solution during drying.

Thermoradiation drying of a thin surp ace film on a translucent substance

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Thermoradiation drying of a thin surp ace film on a translucent substance