Dried fruits, dehydrated vegetables, dried fruits, etc. that we often eat in our daily life are all dehydrated through drying.Microwave drying machines can remove moisture, so that bacteria, yeast and mold can not grow, ultimately conducive to food preservation.The fruit is then dried or dehydrated to make it lighter and smaller.
Present situation and prospect of Microwave Dryer
There are many ways to dry food. The traditional way is to dry it in the sun.But this way of drying, depending on the weather.Drying time is too long, later preservation is also easy to live insects, can not guarantee the color and nutrition of food.Food integrity may also be damaged during transportation.
Microwave drying is a new drying method.During drying, microwaves can be converted into heat energy by acting directly on dielectric molecules.Due to its penetrating properties, microwave can heat the medium inside and outside at the same time without heat conduction, so the heating speed is very fast, and the drying speed can be shortened hundreds of times for the food with water content of less than 30%.
Advantages of microwave drying equipment:
1.Drying quickly
Hot air circulation oven is completely different from traditional drying method.It is the process by which the dried material itself becomes a heating element without heat conduction.Therefore, even the materials with poor thermal conductivity can reach the drying temperature in a very short time.
2.Uniform drying
No matter how the shape of each part of the object, microwave drying can make the object at the same time uniform penetration of electromagnetic waves and generate heat energy.So the drying uniformity is good, will not appear outside the coke endogenous phenomenon.
3.Energy conservation and efficient
Since substances containing water tend to heat up by absorbing microwaves, there is little loss except for transmission.Therefore, high thermal efficiency and energy saving.It can save more than 1/3 energy than infrared drying.
4.Anti-mildew, sterilization,keep fresh
Microwave drying has thermal and biological effects, and can sterilize and prevent mildew at lower temperature.As the drying speed is fast and the time is short, it can maintain the activity of the material to the maximum extent and preserve the vitamin, original color and nutrition in the food.
5.Advancedtechnology
Immediate drying and termination can be achieved by controlling microwave power.The programmable automatic control of drying process and drying process specification can be carried out by using man-machine interface and PLC.
6.Safe and innocuous
Because microwave energy is controlled in the drying room made of metal and waveguide tube, so microwave leakage is very rare, no radiation hazards and harmful gas emissions, no waste heat and dust pollution, neither food pollution, nor pollution of the environment.
The drying process involves almost all sectors of the national economy and is widely used in production and life.The purpose of drying is to remove water or solvents from certain raw materials, intermediate and finished products for processing, use, transportation and storage.
With the development of science and technology, such as biological products, new materials (multiphase composite materials, nanomaterials, intelligent materials and biomedical materials, etc.), advanced ceramics, new advanced food and new pharmaceutical products, the traditional drying technology and dryer are not always adapted to the actual production needs.
Microwave drying technology and microwave dryer have been widely used in light industry, chemical material industry, food and agricultural products processing industry and other industries and showed significant advantages.Microwave drying is undoubtedly a new technology to meet the requirements of new products.
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