The material selection of freeze dryers is mainly based on food safety and equipment performance considerations. The parts of the food freeze dryer that come into contact with or affect the materials, such as the box, shelves, material carts, material trays, etc., need to be made of corrosion-resistant, non-polluting, and easy-to-clean materials. 304 stainless steel is a common material choice because it is corrosion-resistant, easy to clean, resistant to high and low temperatures, and has sufficient strength and toughness to meet food safety requirements and extend the service life of the equipment.
In addition, other key components and material requirements of freeze dryers include:
Freezer chamber: Usually made of stainless steel, with an adjustable temperature and humidity control system inside.
Vacuum system: Used to create and maintain an appropriate vacuum environment, usually by pumping air.
Heat transfer system: Used to transfer heat through conduction, convection, or radiation to accelerate the freezing and sublimation process.
Control system: Used to monitor and adjust parameters such as temperature, humidity, and vacuum to ensure process control and stability.
