| Abstract The experiments of freeze drying of skim milk in vials have been carried out.We have investigated the effects of heating temperature,radiating temperature and chamber pressure on freeze drying process and analyzed the freeze drying curves obtained.Further,the mechanisms of freeze drying and the monitoring of material temperatures are expounded.If heating temperature and radiating temperature are the same,the optimal parameters are 323K and 30Pa for the operation of constant temperature and pressure.Some methods for enhancing freeze drying process are presented too.These results are available for realistic production and offer a base for research of two dimensional model of freeze drying of materials in vials. |
|
1998, Vol. 15 
