The heating technology of tunnel microwave dryer relies on microwaves that periodically change at hundreds of millions of times per second to penetrate the material and interact with the polar molecules of the material. The polarity (such as water molecules) in the material absorbs the microwave and changes. Its original molecular structure also undergoes electric field polarity motion at the same speed, resulting in frequent collisions with each other and generating a large amount of frictional heat. As a result, each part of the material obtains thermal energy and heats up at the same instant, resulting in thermalization, puffing and Water evaporates to achieve the purpose of heating and drying.

When microwaves interact with material molecules in a rapidly changing high-frequency electromagnetic field, they are absorbed and produce a thermal effect. The microwave energy is directly converted into medium heat energy. After the microwave is absorbed by the object, the object generates spontaneous heat. The heating starts from the inside and outside of the object at the same time. It can heat both inside and outside at the same time. Different materials have different abilities to absorb microwaves, and their heating effects are also different, which mainly depends on the dielectric loss of the material. Water is a substance that strongly absorbs microwaves. Generally, substances containing moisture can be heated by microwaves quickly and evenly, achieving a good drying effect.

Tunnel microwave dryers are widely used in the heating, drying and sterilization of various small packaged foods, pastries, biscuits, preserved fruits, soy products, cooked foods, condiments, etc., as well as mildew prevention, sterilization and preservation; it is also suitable for drying seafood. : Puffing, dehydration, drying, sterilization and mildew-proofing of bread, sugar, dried fruits, tea, tobacco, fruits and vegetables and other grain products; drying and sterilization of various oral liquids, Chinese and Western medicinal materials, pills, tablets, medicinal powders, etc.; leisure, Puffing of potato chips, potato chips, shrimp crackers, dried fish, fish cells, etc.; thawing of frozen foods; drying and deodorizing soybeans. Application of microwave energy technology in food, chemical, pharmaceutical and other processing.