Classification of vacuum freeze dryer

Classification of vacuum freeze dryer
Vacuum freeze dryer is a commonly used drying equipment. It adopts a new structure combined with a dehumidification system. It uses a large space for storing materials in the box for drying. How should the vacuum freeze dryer be classified?
Vacuum freeze dryer
Bell-type freeze dryer: The freeze-drying cavity and cold trap have separate upper and lower structures, and the freeze-drying cavity has no pre-freezing function. This type of freeze dryer requires manual operation when it is transferred to the drying process after the pre-freezing of the material. Most of the experimental freeze dryers are bell jar type, with simple structure and low cost. Most freeze-drying chambers use transparent plexiglass covers, which is convenient for observing the freeze-drying of materials.
In-situ lyophilizer: The lyophilization chamber and the cold trap are two independent chambers. The shelf in the lyophilization chamber has a cooling function. After the material is placed in the lyophilization chamber, the manual freezing and drying process of the material does not require manual operation. . The production process of this type of freeze dryer is complicated and the manufacturing cost is high, but the in-situ freeze dryer is the development direction of the freeze dryer. It is an ideal choice for exploring the freeze drying process. It is especially suitable for medicine, biological products and other special products. Lyophilized.
A, common type b, multi-manifold type c, gland type
Vacuum freeze dryer is functionally divided
Ordinary shelf type: The materials are bulked in the material tray, suitable for freeze-drying of food, Chinese herbal medicine and powder materials.
Type with capping device: suitable for drying bottled materials in vials. When preparing for lyophilization, separate the materials into vials as required, freeze the caps after floating caps, and then operate the capping mechanism to compress the caps after drying. , Can avoid secondary pollution, re-adsorb moisture, easy to store for a long time.
Multi-manifold type: Connect the flask outside the drying chamber to dry the material that is spin-frozen on the inner wall of the bottle. At this time, the flask is connected to the manifold outside the drying box as a container. The material in the flask is heated at room temperature through the manifold. The tube switch device can be removed or installed at any time as needed without stopping the machine.
With pre-freezing function: during the material pre-freezing process, the cold trap is used as the pre-freezing chamber to pre-freeze the material. During the drying process, the cold trap is a water trap to capture the overflowing moisture of the material. A freeze dryer with a pre-freeze function, the pre-freezing and drying of the materials during the freeze-drying process are completed on the freeze-dryer. The freeze-dryer has high efficiency and saves the cost of the low-temperature refrigerator.