The freeze-drying process of the freeze dryer is a heat and mass transfer process involving refrigeration, vacuum, electronics, chemistry, low-temperature medicine and other disciplines, with high technology and complicated freeze-drying process. With the continuous development of freeze-drying technology and freeze-drying machine technology, it has been more and more widely used.
In the pharmaceutical industry, vacuum freeze dryers play an important role. They can reduce the possibility of materials being oxidized and deteriorated, eliminate bacteria in materials, ensure that the original shape of materials can be well preserved, and further reduce the risk of contamination. Currently it is used for drying materials such as raw materials, traditional Chinese medicine decoction pieces, biology, and pharmaceutical intermediates.
Freeze dryers are often used for drying fruits and vegetables, meat and poultry, aquatic products, condiments, instant foods and famous specialties. Therefore, the freeze dryer is also called food freeze dryer, which can maintain the original color, aroma, taste, shape and freshness of food. The rehydration is good, and the finished product is easy to store and transport, with lower cost and longer shelf life.
The medicinal material industry adopts vacuum freeze-drying process in drying nutritional and health products such as royal jelly, ginseng, turtle, soft-shelled turtle, and earthworm, which better retains the original nutritional value. In the pharmaceutical industry, it is used for dehydration and preservation of medicines such as serum, plasma, vaccines, enzymes, antibiotics, and hormones.
Biological research can also use vacuum freeze-drying technology to preserve blood, arteries, bones, skin, cornea, nerve tissue and various organs for a long time. They can be regenerated by supplying water when they are used, and still maintain their biological properties.
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