Principle of Microwave Heating:

Microwave is the highest frequency band in radio waves, ranging from 300 megahertz to 300 gigahertz (wavelength of 1m-1mm). When microwaves are radiated onto an object, the unreflected electromagnetic waves enter the interior of the object and interact with the molecules and other substances that make up the object. For different substances, microwaves can produce energy conversion such as thermal, biological, and chemical effects, thereby generating heat to achieve the purpose of heating and drying.

Microwave sterilization mechanism:

Microwave sterilization is the result of the combined action of thermal and biological effects of electromagnetic fields. The eggs and cells in the material will also undergo molecular polarization relaxation and absorb microwave heating. The thermal effect of microwave on the cells will cause protein denaturation and death; The biological effect of microwave on cells is that the microwave electric field changes the potential distribution of the cell membrane cross-section, affecting the concentration of electrons and ions around the cell membrane, thereby altering the permeability of the cell membrane. As a result, cells suffer from malnutrition, abnormal metabolism, structural and functional disorders, and growth and development are inhibited, leading to death. In addition, nucleic acid (RNA) and deoxyribonucleic acid (DNA), which determine the normal growth and stable genetic reproduction of cells, are coiled macromolecules tightly connected by several hydrogen bonds. Strong enough microwaves can cause hydrogen bond relaxation, breakage, and recombination, thereby inducing genetic mutations or chromosomal abnormalities. The biological effects of microwaves play a special role in sterilization that conventional physical sterilization does not have.

Main characteristics of microwave heating:

1. Heating quickly

Microwave heating is the process of making the heated object itself a heating element, without the need for thermal conduction. Therefore, even materials with poor thermal conductivity can reach the heating temperature in a very short time.

2. Uniform heating

Regardless of the shape of each part of an object, microwave heating can uniformly penetrate electromagnetic waves both inside and outside the object, generating thermal energy. So the uniformity of heating inside and outside the object is basically the same.

3. Energy saving and efficient

In the process of microwave heating, there is almost no other loss except for the heating of the heated material. Therefore, it has high thermal efficiency and energy saving.

4. Enzyme prevention, sterilization, and preservation

Microwave heating has thermal and biological effects, and can kill bacteria and prevent enzymes at lower temperatures for preservation. Due to the fast heating speed and short time, it can maximize the preservation of the activity of the material and the color and nutritional content of the original material.

5. Advanced technology enables automated control

As long as the microwave power is controlled, immediate heating and termination can be achieved without thermal inertia. The application of human-machine interface and PLC enables programmable automation control of heating processes and heating process specifications.

6. Safe and harmless, improving working conditions