Technical Principle of Microwave Heating and Drying Equipment

- May 06, 2019 -

The microwave heating technology is a new technology that uses electromagnetic wave to transmit energy into the heated object and to heat it to meet the production requirements. The commonly used microwave frequencies are 915 MHz and 2450 MHz. Due to its high frequency characteristics, it changes periodically at an astonishing speed of billions of times per second. After absorbing microwave energy, polar molecules (such as water molecules, proteins, nucleic acids, fats, carbohydrates, etc.) in materials change their original molecular structure by directional arrangement under the action of microwave. When the direction of electric field changes, the polar motion of electric field at the same speed will cause the rotation of molecule, resulting in frequent collisions between molecules, resulting in a large amount of friction heat, which is expressed in the form of heat in the material, resulting in rapid temperature rise, heating or maturation of the material in a short time. At the same time, under the action of microwave, harmful bacteria and insect pests in materials are affected by non-polar thermal movement and polar rotation to change their arrangement, combination and movement pattern, even if the organism is inactivated by protein denaturation, and some hydrogen bonds of ribonucleic acid (RNA) and deoxyribonucleic acid (DNA) in cells are relaxed and broken. Splitting or recombination disturbs or destroys its normal metabolism, inheritance and proliferation, inhibits or kills the growth of bacteria and pests, and achieves the effect of insecticide, sterilization and preservation.

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