Here are four stages in the complete drying process: pretreatment, freezing, primary drying, and secondary drying.
Applications of freeze-drying-lyophilisation
- Food industry-Freeze-drying is used to preserve food, the resulting product being very lightweight.
- Technological industry-In chemical synthesis, products are often freeze-dried to make them more stable, or easier to dissolve in water for subsequent use.
- Document Conservation-freeze-drying can use as a recovery method of water-damaged books and documents.
- In bacteriology freeze-drying is used to conserve special strains.
- Advanced ceramics processes sometimes use freeze-drying to create a formable powder from a sprayed slurry mist
- Floral preservation-Wedding bouquet preservation
Types of Freeze-dryers:
