Vacuum freeze-drying is one of the most gentle drying methods available. It relies on the principle of sublimation — the direct transition of a solid phase into a gas phase. The material to be dried is placed inside a vacuum drying chamber, where the water vapor produced is condensed by a cold trap to form ice, thereby eliminating water vapor from the system. A vacuum pump is used to evacuate the air from the drying chamber, excluding the water vapor.

The baffle plate is equipped with a heating device, and heat is transferred to the material through conduction to provide the energy required for sublimation. Once the free water in the material has sublimated, the internal bound water can also be removed at a very low vacuum level. This drying process is considered the final stage of drying, known as analytical drying.

Vacuum freeze-drying technology, also known as sublimation drying, is a method of pre-freezing water-containing substances and then sublimating the water under vacuum. This technology is widely used for the freeze-drying of various items, including fruits, vegetables, meats, traditional Chinese medicinal herbs, and health supplements. Freeze-dried food products and medicinal materials are not only easy to store for long periods, but they also retain the original texture, nutritional content, and physical form of the raw ingredients.

Home users can transform seasonal fruits — such as strawberries, bananas, apples, mangoes, and blueberries — into crispy snacks that can be stored at room temperature for months without the need for preservatives. Pet owners can create natural, additive-free freeze-dried treats for their cats and dogs using chicken, beef, fish, or organ meats. Coffee enthusiasts can use the process to freeze-dry coffee beans or brewed coffee, locking in the aroma for long-term storage. Furthermore, small-scale producers and home-based entrepreneurs can leverage this technology to create fruit powders, herbal powders, instant soup mixes, and various snacks for local sale.

1. 1Open the package and check the components against the packing list.
2. 2Fill the pump with oil up to the middle of the level guide. Remark: please use the required oil type.
3. 3Connect the pipe between the pump and the dryer using the connectors. One side is fixed to the pump's air inlet, and the other side is fixed to the dryer's vacuum outlet.
4. 4Connect the pump's power plug into the dryer's vacuum pump power outlet.
5. 5Connect the power wire to the dryer's main power outlet, and connect the other side to the power supply (with ground wire).
6. 6Turn on the switch and test step by step according to the instructions. Once all technical data are satisfied (including vacuum < 15 Pa and condenser chamber temperature < -35 ºC), the dryer is ready for use.

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