Traditional heating or drying methods like steam, hot air, coal burning are used as heat conduction function from the outside to inside of material, Thus, the heating and drying time is a bit longer, and the efficiency is lower, the heating result is not very homogeneous, and operate sometimes need pre-heat oven which cause energy wastage. The invention of microwave drying equipment has precisely dealt with the above problems, and is now widely used in food, chemical, grains and pharmaceutical industries.
Microwave radiation has the selective heating characteristic. For example, if material has a large moisture content that is water molecula