Other heating/drying equipment　Technical information
Dielectric Microwave Heating—Ever-increasing Applications in All Fields of Industry

The application of microwave heating is progressing even further as a heating source in a wide range of fields—food, wood, rubber, ceramics, chemistry and textiles, to mention but a few. High-frequency and microwave heating rapidly achieves even and uniform heating, something that has been impossible with conventional external heating by hot air, stream and electric heat.

Electromagnetic Waves Absorbed by Substances

■Features of Dielectric Heating

1. Short Heating Time

With conventional external heating by hot air, steam or electric resistance heat, the center of the heated substance rises by heat transfer from the outside to the inside by thermal conduction. High-frequency and microwave heating, however, is internal heating–the heated substance itself becomes the heating element. With this heating method, substances can be heated in a short time since the temperature at the center can be increased regardless of thermal conduction.

2. Uniform and Even Heating

With external heating, a high external temperature must be set to raise the temperature at the center. As a result, there is a large difference between the outside and inside temperatures. With High-frequency and microwave heating, however, electric waves almost uniformly penetrate all parts of the heated substance and all parts generate heat simultaneously, enabling relatively uniform and even heating.

3. Selective Heating

The heated substance generates heat by dielectric loss, which means that the calorific value increases proportionally as the loss factor increases. So, substances with a large loss factor can be selectively heated.

4. Excellent Heat Efficiency

Highly efficient heating is ensured since almost all High-frequency and microwaves are absorbed by only the heated substance and the ambient temperature is not directly increased.

5. Easy Heat Control

Start and stop of heating, or heating temperature adjustments can be made accurately and with quick response by electrical control.