A. Introduction and Features Vacuum dry is to let the raw material to be dried at vacuum condition heating and drying. It uses vacuum pump to pump damp and make the working chamber form vacuum status. Therefore the dry speed of raw materials quickened and the energy is saved greatly. It is divided into static and dynamic drier. Model FZG round vacuum drier or Model FZG square vacuum drier belongs to static drier. Model SZG double cone rotating vacuum drier Belongs to dynamic drier. When raw material is dried in static drier, raw materials in static state and its shape can not be destroyed. Before drying, it can carry out the treatment of disinfection. When raw materials dried in dynamic drier, raw materials is turned over ceaselessly. So it can be dried better and more uniformly. In the state of vacuum the boiling point of raw material will be dropped. Therefore it is suitable for drying raw materials that are unstable or thermal sensitive. The vacuum drier also has good air-tightness. So it is also suitable for drying raw materials that contain strong irrigative and toxic gases and the solvent needs to be recovered. The vacuum drier has been widely used for pharmaceutical industry, chemical industry, foodstuff industry, dyestuff industry and so on.
