Shop Freeze Dryers
We offer an extensive range of freeze dryers meticulously designed to meet the demands of modern industries. Browse through our selection and buy a high-quality freeze dryer online!
SED Pharma is a comprehensive supplier with experience providing laboratory and industrial freeze dryer machines for the pharmaceutical, food, and chemical industries.
About Freeze Dryers
Freeze dryer operates based on vacuum freeze drying technology and finds applications in the pharmaceutical, biological products, food, blood products, and active substances industries.
Principles of Freeze Drying:
The fundamental principle of vacuum freeze drying relies on the three-state transformation of water, which can exist as a solid, liquid, and gas simultaneously. The triple point of water occurs at a temperature of 0.01℃ and a water vapor pressure of 610.5Pa, where water, ice, and water vapor coexist in equilibrium.
In a high vacuum environment, the sublimation process is employed, allowing the frozen water within pre-frozen materials to directly transition into the ice state without going through the liquid phase. This unique process achieves freeze drying without ice melting.
Characteristics of Freeze-Dried Products:
Freeze-dried products possess a sponge-like texture, experience no shrinkage, exhibit rehydration properties, and retain very low moisture content. When appropriately packaged, they can be stored and transported at room temperature for extended periods.
Components of a Vacuum Freeze Drying Machine:
A vacuum freeze dryer comprises several key components, including:
- Drying box
- Refrigeration system
- Vacuum system
- Media heat exchange circulation system
- Automatic control system
- Pneumatic system
- In-place cleaning and disinfection system
Types of Freeze Dryers:
Freeze dryers can be categorized based on their structure and function.
By Structure:
- Bell-type Freeze Dryer: This type requires manual transfer of materials from the pre-freezing chamber to the vacuum freeze-drying chamber, making it cost-effective and suitable for laboratory use.
- In-situ Freeze Dryer: These feature separate freeze drying and cold trap chambers and are suitable for complex processes, particularly for pharmaceutical and biological products.
By Function:
- Ordinary Shelf Type Freeze Dryer: Ideal for bulk trays of materials, such as Chinese herbal medicine.
- Multi-manifold Type Freeze Dryer: Connects flasks outside the drying room to dry materials spin-frozen on the inner wall of the bottle, offering high efficiency and reduced costs.