Radio frequency dielectric heating will heat water in preference to most substrates with which it is associated. This means not only rapid heating but, in the case of drying, equalisation of moisture content in a product as the wetter areas may absorb more heat than the drier ones.
Since energy is transferred by the interaction between the high frequency electric field and the responsive components in the substance, heat is generated throughout the volume of the body.
Efficient Use of Energy
In a RF system, it is possible to design the system so that power is drawn in the proportion to the amount of responsive material in the applicator, hence there is no energy used when the equipment is empty. When carrying out drying, baking or similar operations the energy output will rise and fall proportionally with the quantity of water present in the unit, resulting in high efficiencies.
Improved Product Quality
Because it can avoid case hardening and other surface damage because of the volumetric nature of the heating, the quality of a whole range of products, from textiles, to glass fibre, ceramics, polymers wood, paper and food, can be greatly enhanced.