The microwave dryer is the highest frequency band in radio waves, ranging from 300 MHz to 300 GHz (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 effects such as thermal, biological, and chemical effects, thereby generating heat to achieve the purpose of heating.

Microwave drying machine sterilization principle:

Microwave drying machine 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 effect of microwave dryer plays a special role in sterilization that conventional physical sterilization does not have.

The main characteristics of microwave drying machine heating are:

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 the object, heating with a microwave dryer 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

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

4. Enzyme prevention, sterilization, and preservation

Microwave dryer heating has thermal and biological effects, which 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 power of the microwave dryer 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

Due to the fact that microwaves are controlled to work in metal heating chambers and waveguides, microwave dryers have almost no microwave leaks, no radioactive residues or harmful gas emissions. Microwave drying equipment has less heat dissipation and low noise, greatly improving the working environment and labor intensity of workers.