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Radio frequency technology

How does it work

Radio frequency (RF) is a drying and heat treatment technology based on the dissipation of electromagnetic energy in products. It is different from traditional technology. For the traditional technology, heat is transferred from the external heat source to the interior of the product through its surface by means of conduction, convection or radiation, and the RF field directly generates heat in the whole product - this is why the relevant mechanism is called "endogenous". The heat generation is instantaneous, which can realize a fast, uniform and perfect control process, so as to achieve excellent results in product quality, operation flexibility and energy saving.

RF heating mechanism

The RF heating mechanism, excluding materials (such as metals) that are good conductors of current, is related to the so-called "dielectric loss". Dielectric loss is caused by the vibration and rotation of polar or polarized molecules and the polarization and translational motion of ionic particles in materials. It is caused by the rapid (millions of times per second) polarity reversal of RF fields. This can be explained by the fact that the electromagnetic field is absorbed and converted into heat energy by the rapid movement of polarized molecules and ions. Water molecules are highly polar, stronger than all substrates in which water can usually be found, and many ionic substances are usually dissolved in water. Therefore, RF electromagnetic fields can heat moist materials very quickly. In particular, RF can quickly, effectively and selectively evaporate water from many substrates (textiles, agricultural products, baked goods, etc.). 

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