Vacuum Tray dryer
is the most commonly used batch dryer. They are box-shaped with a door (two doors on the larger models). Inside are heating plates mounted one above the other on which the product is trays placed. The heating plates and trays should be as smooth as possible to permit optimal heat transfer between plates and product. The medium flowing through the heating plates is water, steam or thermal oil. The distance between the heating plates is determined properly. To void retrograde condensation the cabinet walls are indirectly preheated by the heating plates. During the main drying phase the vacuum is in the range of 40 to 80 mbar abs and in the final drying phase vacuums of only 20 to 30 mbar abs are required. Heating temperatures are normally in the range between 50°C to 70°C,depending
on product to be dried.PAAN Vacuum Tray Dryer
(VTD) is suitable for drying of thermal sensitive materials easily resolved, polymerized of deteriorated under higher temperature. Sterilization can be conducted prior to the drying process, during which no matter is allowed to enter the product. Static vacuum dryer eliminates the configuration damage of the drying materials therefore widely used in pharmaceutical, chemicals and foodstuff etc.