The frequency of 300 MHz microwave electromagnetic waves. The material is heated in the water medium is a polar molecule. It is in a rapidly changing high-frequency electromagnetic field, its very sexual orientation will change with changes in external electric field, causing friction between molecular motion and effects. At this point the microwave field in the field can be converted into medium heat, temperature of materials to produce a series of heating and expanding physical and chemical processes to achieve the purpose of microwave heating and drying. 

 Mechanism of microwave sterilization 

 Microwave sterilization is the use of the thermal effects of electromagnetic fields and biological effects of interaction results. Microwave heating effect on the bacteria is to protein denaturation, loss of nutrition of bacteria, the conditions of reproduction and survival and death. Biological effects of microwave on bacteria microwave electric field can change the permeability of the membrane section, bacteria thus malnutrition, not the normal metabolism, bacterial structure and function disorders, growth was inhibited and death. In addition, the determinant of genetic stability of normal growth and reproduction of nucleic acid (RNA) and deoxyribonucleic acid (DNA), relaxation by a number of hydrogen bonds, breaking and reorganization, and induce genetic mutations, or chromosomal aberrations whispering sound, or even broken. 



 Main features of microwave heating 

 1, the rapid heating 

 Microwave heating and conventional heating entirely different. It is to be heated material itself as fever, no heat transfer process. Thus, although poor thermal conductivity of materials can also be achieved within a very short time the heating temperature. 

 2, uniform heating 

 No matter how the shape of various parts of the object, microwave heating can make the object table at the same time uniform penetration of electromagnetic waves generated heat. Therefore, heating uniformity, and will not appear outside the focus of endogenous phenomenon. 

 3, energy efficient 

 Due to the presence of substances that can absorb microwave moisture and heat, so in addition to a small amount of transmission loss, almost no other loss. Therefore, high thermal efficiency, energy saving. Infrared heat energy than 1 / 3 or more. 

 4, mildew, sterilization, and preservation 

 With the thermal effect of microwave heating and biological effects, temperatures in low temperature sterilization and mildew. Because heating speed, time is short, to maximize the activity and food preservation materials in the vitamin, the original color and nutrients. 

 5, advanced technology 

 Microwave power can be realized as long as the heat and immediately terminated. Man-machine interface and PLC applications can be heated and heating. Programmable automation control technology standards. 

 6, safe and sound 

 Because microwave energy is to control the heating in the interior and metal work waveguide, microwave leakage so little, there is no radiation hazard and harmful gas emissions, no waste heat and dust pollution, not contamination of food, nor pollute the environment.