Freeze Drying Machine
Freeze-drying is an advanced drying method in which the product is dried through the sublimation of water under low temperature and pressure.
STRUCTURE
- Drying chamber
- Module to form a vacuum
- Refrigeration unit
- Heating unit
- Defrosting the cooling unit
- Cart
- Electrical box
WORKING PRINCIPLE
- Stage 1: Freezing process to convert water to solid state.
- Stage 2: Creating vacuum pressure and heating the frozen water in the drying chamber to sublimate it. The release stream is absorbed in water trap.
- Stage 3: Vacuum drying to evaporate remainder of the steam in product to respond to the demanded moisture of the product
|
|
COLD DRYING |
FREEZE DRYING |
|
Principle |
Use dry air (with low humidity) for drying |
Use low temperature, vacuum pressure to dry. |
|
Pressure |
Standard air pressure |
Vacuum(27-133Pa) |
|
Drying temperature |
about 15-75oC |
≤ 50oC |
|
Moisture condensation |
By dehumidifier |
Freeze water |
|
Characteristics of dried products |
Less prone to modify in color, shape and nutrients Flexible structure |
Color, shape, nutrients are not changed Porous structure |
TECHNICAL PARAMETERS
- Design capacity: 1 - 6 tons/ batch depending on the recommendation
- Freezing temperature: from -30oC to -50oC
- Freeze drying temperature: from 25 to 35oC
- Absolute drying temperature: ≤ 50oC
- Drying pressure: from 27 pa to 133 pa
- Drying time: depending on materials from 20h to 36h.
ADVANTAGES
- Low drying temperature: ≤ 50oC.
- Reserve colors and shapes
- Reserve nutrition of the material,
- After drying, if product is soaked in water, it will return to its initial shape.
- Prolonging the storage time.
APPLICATION
Drying agricultural products, fruits, medicinal herbs, and precious materials such as cordyceps and seafood.
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