Principle of Vacuum Freeze Drying
Vacuum freeze drying involves first freezing the wet material below its triple point, causing the moisture within to become solid ice. Then, under a vacuum environment, heat is applied to enable the sublimation of ice directly into water vapor. The vapor is continuously removed from the system, resulting in the dehydration and drying of the material.
Low Oxygen Environment
Drying is carried out under vacuum conditions, where the system is highly oxygen-deficient. This effectively inhibits the growth of microorganisms and protects materials that are sensitive to oxidation.
Minimal Loss of Nutrients and Volatile Components
Since drying occurs at low temperatures and under freezing conditions, moisture in the material sublimates directly from ice to vapor. This process minimizes the loss of volatile substances and nutrients, making it especially suitable for the drying of biochemical products and food items.
Ideal for Heat-Sensitive Materials
Vacuum freeze drying operates at temperatures below the freezing point of water, which is ideal for drying heat-sensitive substances. For example, proteins and microorganisms can be dried without denaturation or loss of biological activity, which is why the method is widely used in pharmaceuticals.
Excellent Structural Preservation and Rehydration Performance
The process removes approximately 95%–99% of the moisture content, resulting in a dried product that resists shrinkage and degradation. The material’s structure, including nutrients and solid components, is well preserved. Upon rehydration, the product quickly regains its original characteristics, making freeze-dried foods more similar in flavor and texture to fresh foods.
With the advancement of international freeze-drying technologies, China has also made significant progress in both equipment and practical applications. Freeze-drying technology is now widely used across various fields in daily life and industrial production.
In Bioproducts:
Applied to the freeze-drying of vaccines, diagnostic reagents, serum products, animal specimens, etc.
In the Pharmaceutical Industry:
Used for antibiotics, vitamins, enzyme preparations, blood products, and more.
In the Chemical Industry:
Applied to the drying of catalysts, health supplements, handicrafts, books, etc.
In the Food Industry:
Extensively used for fruits, vegetables, fruit juices, seafood, pet food, instant coffee, ready-to-eat meals, snacks, and more.
The primary purpose of freeze-drying is to enhance product quality and extend shelf life, thereby improving the economic lifespan and commercial value of various products and foods.
This project involves the deployment of 17 MTFD240-3000L freeze-drying units, primarily for the lyophilization of strawberries, with additional processing of lemon slices, corn kernels, yellow peaches, figs, and other fruits and vegetables.
The freeze-drying chambers adopt a split-type side-mounted configuration for improved flexibility and ease of maintenance. The refrigeration system features a centralized cooling setup with pump-fed liquid supply (thermosiphon with surge drum), ensuring high cooling efficiency and stable operation—ideal for large-scale, multi-variety fruit and vegetable freeze-drying. The system meets strict food-grade hygiene standards, preserving nutritional value and natural flavor.
This project includes 6 MTFD240-3000L freeze-drying lines, mainly used for raw bone-in meat-based pet foods, including beef, duck, and turbot. The system is designed to process high-protein pet food ingredients while ensuring quality and safety.
The freeze-drying chambers adopt a split-type side-mounted configuration, offering a compact layout and easy maintenance, suitable for multi-variety, small-batch flexible production. The centralized refrigeration system with pump-fed liquid supply (bucket pump system) delivers high efficiency and operational stability, supporting continuous processing under stringent hygiene standards. The solution helps retain nutrients, enhance palatability, and ensure product safety—critical to premium pet food manufacturing.
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