Microwave drying mechanism
Microwave is a very short wavelength of electromagnetic waves (i.e., wave length of 1 mm to 1 meter) it and the radio waves, infrared, visible light waves are all the same. Microwave is the frequency at 300 MHz to 300 GHz, with a penetrating properties of electromagnetic waves, commonly used microwave frequency of 915MHz and 2450MHz. Microwave heating hundreds of millions of times per second rely speed through the cycle within the material of the microwave, polar molecules interact with the material, the material in the polar (such as water molecules) absorb microwaves and change its original performed on the same molecular structure as polarities movement speed, resulting in frequent collisions between them and generate a lot of frictional heat, so that the various parts of the material obtained at the same instant heat and temperature, heating successive generation, expanded and evaporation occurs, to achieve the purpose of heating and drying.
Microwave frequency electromagnetic field in a rapidly changing molecular interaction with matter, is absorbed and thermal effects, the microwave energy is directly converted to medium heat, microwaves are absorbed by the object, the object from the raw heat, heat from the object inside, outside and began, both inside and outside can be heated, the type of material to absorb the microwave different capacities, the heating effect is different, depending on the material of the dielectric loss. Water is a very strong material absorb microwaves, generally a substance containing water can be heated with microwaves, rapid and uniform to achieve a good drying effect.
Microwave sterilization mechanism
Microwave sterilization is the use of the thermal effects of electromagnetic waves and biological effects under the action of the result. Microwave heating effect is the biological cell is composed of water, proteins, nucleic acids, carbohydrates, fats and the like complex compounds listed machines consisting of a condensed medium. The media's role in a strong microwave field, the temperature rises. The spatial structure changes or destruction, protein denaturation, affect its solubility, viscosity, swelling, stability, and thus the loss of biological activity.
Microwave biological effect is the change of microwave arrangement of biological and movement of aggregate state, and the microwave field induced ion flow, will affect the charge distribution near the cell membrane, leading to damage the membrane barrier and affect the function of NA-K Pump produce membrane dysfunction, which interfere with or disrupt the normal cell metabolism, leading to bacterial growth inhibition, stop, or death. In addition, the decision to normal cell growth and stability of the genetic breeding of RNA (RNA) and deoxyribonucleic acid (DNA) in the microwave field force of the hydrogen bond relaxation can lead to fracture and restructuring. Induce genetic mutations or chromosomal aberrations, thus affecting its biological activity change, delay or interruption of the genetic stability of cells and proliferation. Microwave biological (non-thermal) effects in the sterilization routine physical sterilization played a special role not found.
Microwave sterilization, preservation is the use of the thermal effects of electromagnetic waves and biological effects under the action of the result. Mainly from the thermal effects of microwave sterilization rapid warming, rather than thermal effects of the use of microbial protein in vivo and physiologically active substances mutate, and loss of vitality or death. Therefore, microwave sterilization temperature lower than conventional methods. Conventional methods sterilization temperature to 100 degrees or more, the time to ten minutes to tens of minutes, while the microwave sterilization temperature is only between 70 to 90 degrees, for about a few minutes.

 

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