Conventional heating such as flame, hot air, electric heating, steam and other heating, are the use of heat conduction principle of heat from the outside of the object into the inside, and gradually increase the center of the object temperature, known as external heating. The process to make the central part of the required temperature, take some time, while the need for a higher external temperature; poor thermal conductivity of the object takes a long time. Industrial microwave equipment is to make the object itself to be heated objects, called the overall heating method, do not need heat conduction process, so in a short time to have a uniform heating. This feature allows the heat conduction of poor material in a short time to be heated and dry, the energy utilization rate is improved, but also can make the size of the furnace than the conventional heating furnace is smaller.
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