When the microwave dryer is used to sterilize food, the microwave can interact with the bacteria in the food, and the potential distribution of the bacterial membrane section affects the electron and ion concentration around the cell membrane, thereby changing the permeability of the cell membrane. The bacteria are malnourished, cannot metabolize normally, and their growth and development are hindered and killed. From a biochemical point of view, nucleic acids ( RNA ) and deoxyribonucleic acid ( DNA ), which are normally grown and propagated by bacteria, are coiled macromolecules tightly connected by several hydrogen bonds. Microwaves cause hydrogen bond relaxation, breakage and recombination, thereby inducing genetic or chromosomal aberrations or even breakage. Microwave sterilization is the use of electromagnetic field effects and biological effects to kill microorganisms. 

Microwave sterilization machine food is very easy to be contaminated and deteriorated in the process of production, preservation, transportation and sales. Usually, conventional techniques such as high temperature, drying, blanching, pasteurization, freezing, and preservatives can be used to achieve insecticidal sterilization and preservation of food, but often affect the original flavor and nutrients of food. 

The microwave drying sterilization machine is to make the microorganisms in food, and at the same time, by the combined action of microwave thermal effect and non-thermal effect, the protein and physiological activity substances in the body are mutated, which leads to the delay and death of the growth and development of the microorganisms, so as to achieve the purpose of food sterilization and preservation. 

Tunnel microwave drying sterilization machine is a kind of drying equipment to meet the requirements of mass production. It can dry, dehydrate, sterilize, ripen, de-enzymize, kill eggs and other effects on food, condiment, medicine, Chinese herbal medicine, instant noodles, rice flour, soybean products, pork and beef, seafood, tea, wood, chemical industry, decoction pieces and other materials.