Products / Freeze Dryers

Mode1: Specification

(1) Lab Scales Desktop: Freeze-dried Weight 1.5-2KG

Standard/Manual gland/Multi-manifold/Multi-manifold gland/T-frame/Soil/Mini

(2) Lab Scales Vertical: Freeze-dried Weight 2KG

Standard/Manual gland/Multi-manifold/Multi-manifold gland/T-frame

(3) Scientific Research Scales: Freeze-dried Weight 3KG

Standard/Manual gland/Multi-manifold/Multi-manifold gland/T-frame

(4) Pilot Scales: Freeze-dried Weight 3KG-20KG

0.2m²/0.3m²/0.5m²/1m²/2m²

Mode2: Customization

Please set up these specifications

(1) Freeze-dried Area:

(2) Freeze-dried Weight:

(3) Freeze-dried Sample:

(4) Cold Trap Temperature:

About 24 hours, it mainly depends on the sugar and water content of the fruits.

For example, freeze-drying strawberries usually takes 24 hours, and may take longer for larger strawberries. For bananas, it takes about 18 to 24 hours if they are made into banana chips, and 36 to 48 hours if they are made into banana powder. For small apples, freeze-drying time is usually 24 to 36 hours, while larger apples may take more time.

The time required to freeze-dry fruit in a freeze dryer varies depending on a number of factors, including the type, size and moisture content of the fruit, as well as the performance and parameters of the freeze dryer. Generally, the freeze drying process is a gradual and slow warming from a low temperature and takes anywhere from a few hours to a dozen hours.

Please note that these are only general reference times, and the specific freeze-drying time should be determined according to the actual freeze-dried product, the performance of the freeze-dryer and the freeze-drying process. In addition, the appearance and quality of the freeze-dried product may be affected if the temperature rises too quickly or is too high during the freeze-drying process.

Freeze-drying materials with a freeze dryer machine typically involves several key steps. Although the specific number of steps may vary slightly depending on the type of freeze dryer and the material being processed, a general outline of the process includes the following:

Pre-treatment: This step involves preparing the materials for freeze-drying. This may include washing, slicing, or grinding the materials to ensure uniform drying.

Freezing: The materials are cooled to below their eutectic point (the lowest temperature at which solid materials will exist in equilibrium with their vapor) to form solid ice crystals. This freezing process is crucial for effective freeze-drying.

Vacuum Application: Once the materials are frozen, a vacuum is applied to the chamber of the freeze dryer. This removes air and creates a low-pressure environment, essential for the sublimation process.

Sublimation (Primary Drying): Sublimation is the process of ice changing directly from solid to vapor without melting. The application of heat under vacuum causes the ice in the materials to sublime, leaving behind a porous, dried structure.

Desorption (Secondary Drying): This step removes any residual unbound water from the material. It involves further heating under vacuum to drive off any adsorbed water molecules.

Sealing and Storage: After the drying process is complete, the materials are typically sealed in a moisture-proof container to prevent reabsorption of moisture from the atmosphere.

It's important to note that each step requires careful monitoring and control to ensure optimal freeze-drying conditions. The freeze dryer machine typically has controls for temperature, vacuum level, and other parameters that need to be adjusted based on the specific materials being processed.

Additionally, the time required for each step can vary depending on the type of material, its initial moisture content, and the specific freeze-drying conditions. Therefore, it's recommended to follow the manufacturer's instructions or consult with a freeze-drying expert to ensure successful freeze-drying of your materials.