Abstract
Drying of potato starch paste in hot air, high humid air and superheated steam was examined. Initial moisture content was 0.92kg/kg-d.b., wet bulb temperature of gas flow ranged from 48℃ to 100℃, and gas temperature was 160℃. Temperature and moisture content changes of samples during drying were measured, and cross sections of samples were observed by SEM. The property of dried starch was strongly affected by wet bulb temperature - gelatinization effectively occurred only at higher temperature with water. In addition, the initial condensation/evaporation process in high humid air treatment, based on temperature and moisture content changes, was modeled as reverse process - an important process for material properties for drying.
