What is Dielectric Heating?

when non metallic parts such as food plastics bones are subjected to an alternating electrostatic field dielectric loss occurs in dielectric heating use of this losses is made the material to be used is placed as a slip between metallic plates are electrodes connected to high frequencies is apply for producing sufficient it to conceive between 10 and 30 megahertz is used even though voltage of 20 kilovolts have been used but from personal safety point of view voltage between 600 volt and 3 kg are in common use this is necessary for vacancy supplies obtained from a valve oxylator as in the case of high frequency.

\Eddy current heating the current drawn by the capacitor when an AC supply voltage is applied across its two plates do not lead the supply voltage by exactly 90% degree and there is always in a face component of the current due to this page component of current heat is always produced in the dielectric material place in between the two plates of the capacitor the electric energy dissipated in the form of heat energy in the dielectric material is known as dielectric loss the dielectric loss is directly proportional to the frequency of AC supply given to the point that of the capacitor the physical conception of the dielectric loss is just as a molecule infection in the dielectric material when an AC electrostatic field is applied to heat insulator being poor conductors can be heated up clean from outside in dielectric heating the leg the heat is produced within the material itself because the heat generation is uniform the dielectric feet material is heated uniformly this is the important property of dielectric heating insulator or non conducting material the amount of the heat produced by dielectric heating can be calculated as follow the material to be heated may be considered as the I’m a perfect dielectric of a condenser and maybe, therefore, represented as capacitor + in between with the resistance

dielectric constant therefore the dielectric heating depends upon the value of the frequency and the voltage by wearing one of these two quantities the rate of dielectric heating can be varied their solution problem limits the voltage to be used to achieve more it how frequency is used however there is a limit also on the high frequency in post by cost involved in getting a circuit for obtaining very high frequency and other difficulties the cost of the equipment required for the dielectric heating is so high that is employee only where other methods is impacted impracticable or to slopes some of the application of dielectric heating are as given below

1 Preheating of Plastic Performs-  the raw material in the form of tablets or biscuits commonly called plastic preforms is required to be heated uniformly before putting them into the hot models so that almost become fluid at a time otherwise if the raw material is put directly into the most usual in heated by steam the outer scheme of the perform will become hot and start curing wild Appu of the material has not finished floor temperature resulting in the unequal hardening of the plastic and improper filling the months for the difficulty arises due to the fact that plastic the material once cute cannot be soft and again satisfactorily any method of eating depending upon conduction of heat from source to the pole vault miserably fill because plastic is bad conductor of heat dielectric heating is the only method which can be used for printing the plastic perform to proper temperature uniformly 2- Glancing of Wood-  dielectric heating is a most commonly used for slicing  of wooden sheet or both as

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