Working Principle
The work of vacuum freeze drying machine is based on the principle of sublimation, i.e. under the low temperature (usually -40°C to -80°C) vacuum environment, the moisture in the frozen material is directly transformed from solid state to gas state. Its working process mainly includes three core steps of pre-freezing, sublimation drying and resolution drying:
- Pre-freezing: the material to be dried is quickly frozen to -40℃~-50℃, so that the moisture becomes ice crystals to minimize the damage to the cell structure of the material.
- Sublimation drying: under the vacuum environment, the ice crystals in the frozen material are directly sublimated into water vapor without going through the liquid water stage, thus avoiding the destruction of the nutrients of the material by high temperature.
- Resolution drying: continue to pump away the water vapor in the vacuum environment, so that the water in the material is further reduced until it reaches the dry state.
Technical specifications
|
Parameters |
GK-100 |
GK-125 |
GK-200 |
|
Heating area (m2) |
100 |
125 |
200 |
|
Loading capacity(Kg/batch) |
1200 |
1500 |
2400 |
|
Rated maximum water trapping capacity(Kg/h) |
220 |
275 |
440 |
|
Heating method |
Double side radiation |
||
|
Heating media |
Deionized water |
||
|
Adjustable temperature range of heating plate(℃) |
Room temperatrue ～+120 |
||
|
Vacuum pressure of working |
≥50Pa |
||
|
Supporting refrigeration capacity(t0=-40℃ tk=35℃)(KW) |
160 |
200 |
320 |
|
Consuption capacity of steam vapor 0.7MPa(kg/h) |
340 |
400 |
690 |
|
Installed power |
69 |
85 |
115 |
Vacuum Freeze Drying machine Application
Vacuum freeze drying machine is widely used in many fields due to its unique technical advantages:
- Food industry: for the processing of ready-to-eat food and dehydrated vegetables, to maintain the fresh taste, color and nutrition of the food, while reducing weight for storage and transportation. For example, Nestle Nescafé freeze-dried coffee and Green Giant dehydrated vegetables.
- Pharmaceutical field: It is used for drying and preserving biological products such as vaccines and serums to avoid protein denaturation and loss of activity caused by high temperature, and to ensure long-term preservation and transportation of the products in a sterile and stable state. For example, Pfizer-BioNTech's COVID-19 vaccine utilizes freeze-drying technology.
- Cosmetic industry: Cosmetic products processed by lyophilization technology have extremely low water content and can significantly inhibit microbial growth under vacuum-sealed packaging, with no or minimal addition of preservatives, improving product safety and active ingredient retention.
- Laboratory research: Used for long-term preservation of biological samples (e.g., DNA, proteins, cells, tissues, etc.), which reduces the reliance on low-temperature storage equipment and lowers preservation costs.
- Other fields: It is also applied in the R&D and production of microbial fertilizers, biopesticides, enzymes and other products, as well as in the synthesis of polymers and nanomaterials to control the microstructure of materials.
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