Vacuum freeze drying technology is the most advanced technology for food dehydration processing at present. Compared with the common drying method, the freeze-dried food produced with this technology features long period of quality assurance, good re-hydration nature, good-looking color, good flavor, taste, shape and high content of nutritious components. The dried food basically remains unchanged in its volume and shape, it looks like sponge and has no shrinking. This kind drying technology can be widely used in process of vegetables, fruits, condiments, aquatic products, biological products,  beverage and etc.
Working principle of vacuum freeze dryer
Instead of traditional vaporization dehydration method, the vacuum freeze drying technology is dehydrate products by sublimation directly from ice to vapor. During the Freeze drying process, the materials will be frozen to -18°c, then move into the vacuum drying tank for dehydration, automatic control system will set the vacuum and heating temperature according to the freeze drying cirve of each products to maintain the proper circumstances for FD processing. The materials stay in frozen status during the drying process and water vapor will be condensed on the surface of cold trap coils to absort the water out from the materials.
Application
The vacuum freezing and drying machine can be widely used in various fields, such as vegetables, fruits, condiments, seafood, biological products, beverage, specimen, etc.

 Freeze Dryer is suitable for a small amount production, or pilot scale test. This series is one of our patent products.
This series of dryers have heating shelf. Freezing and drying process are finished in same place. It changes the traditional complicated operation and prevents product from pollution.
Main Features Vacuum Freeze Dryer (standard type)

1. With heating shelf and PID control standard, with programmable function
2. With organic glass observation window, the whole process is easy to see
3. 32 groups programme can be stored, each programme can be set up 36 segments
4. The shelf temperature accuracy is ≤ 1℃
5. Silicon oil fills hollow shelves, with most uniform shelf temperature ,consistent and
      repeatable drying
6. Big touch screen LCD display, English interface, display of drying curves
7. Internal surface of rectangular chamber and product tray are constructed of stainless steel
8. Air-let-in valve with nitrogen is available
9. Eutectic point test device is optional