Effects of puffing temperature on drying characteristics of winter jujube by explosion puffing drying at variable temperature and pressure

In order to investigate the moisture content change theory and obtain the drying kinetics model of winter jujube by explosion puffing drying at variable temperature and pressure difference. Effects of different puffing temperature on drying characteristics of winter jujube by explosion puffing drying at variable temperature and pressure difference were investigated. The drying kinetics model of winter jujube was founded. Results showed that the explosion puffing drying process of winter jujube occurred in rising-rate, constant-rate and falling-rate period. When the moisture content was about 50%, the drying process was in constant-rate constant period. And the drying process was in falling-rate period when the moisture content was 40%. Most of drying process was in falling-rate period. Henderson and Pabis model provided better simulation of drying curves for winter jujube at different puffing drying temperature. This research can predict the relationship between explosion puffing drying time and moisture content change, and provide a technical basis for controllable industrialization production of explosion puffing drying at variable temperature and pressure difference for winter jujube.