Drying characteristics of poria cocos with different drying methods based on Weibull distribution

Poria cocos is a traditional Chinese herbal medicine. It generally takes almost 7 days to be dried by traditional natural drying, and it is sensitive to microbial spoilage during drying. Poria cocos blocks are easily broken at the traditional hot air drying, such as oven drying. There are many drying methods, but we don't know how to choose the method quickly. To study the drying characteristics of poria cocos, overcom the drawbacks of poria cocos blocks which is easily broken and surface cracking after drying, improve the quality of dried poria cocos and shorten its drying time, the nature drying, oven drying ,air impingement drying, pulsed vacuum drying approaches were applied to poria cocos drying. The Weibull distribution model was applied to the drying process under different drying methods and the results were analyzed. The results provide a reference for the application of Weibull distribution on poria cocos drying and help people gain the best drying method.