Microwave Heating

For heating with higher frequencies (over 300 MHz) the term microwave heating is used. The microwave energy generated by a magnetron, either directly or by means of intermediate waveguides, is transmitted into the heat chamber in which the material to be processed is placed (Figure 1).

To gain more uniform heating, a rotating dish or a fan-shaped mode stirrer are often implemented into the chamber design.

Frequency dependence of the dielectric properties of water

Figure 1. Schematic sketch of a microwave heat chamber with an energy launch site [2]

Microwave Heating

By using microwave energy, heat is generated inside the product volume by directly transforming the electromagnetic energy into molecular kinetic energy.

Püschner Microwave Heating Advantages

Costs

saves energy because only the product is heated
compact units save space
limiting factor "heating" on the process line is eliminated
flexible modular design
reliable with an intelligent service and maintenance concept
environmentally friendly

Quality

gentle on the product because of total volume heating
high control and process speeds
minimal delay before ready to use
rapid heating to operating temperature
uniform heat distribution

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Dielectric Heating

Microwave Heating