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Microwaves have the property of selective heating of substances: for example, water is a substance with very strong molecular polarity, and it is more susceptible to microwave heating. Therefore, the higher the water content, the easier it is to absorb microwaves, and the heat is faster and faster. As moisture content decreases, its ability to absorb microwaves also decreases.
In the early stage of product drying, the moisture content in the product is very high, and the power of the microwave equipment has a high impact on the drying effect (water is the best medium for absorbing microwaves). With the extension of time, most of the microwave energy is absorbed by the water and the water quickly migrates. And evaporation; In the late drying period of the product, with the reduction of moisture, the required microwave energy is also less, and the microwave equipment power can be properly diluted. However, there are many products that cannot be dried under high temperature conditions. Microwave vacuum drying equipment is needed at this time: under vacuum, the boiling point of water is reduced, and nutrients, vitamins, etc. can be well maintained. At the same time, in the vacuum system, the content of air in a unit volume is lower than that in the atmosphere. Drying the food in this relatively oxygen-deficient environment can reduce or even avoid the opportunity of oxidation of fat in the food, pigment browning or other oxidative deterioration, Therefore, some products with high added value, such as Cordyceps and Ginseng, are microwave vacuum dried.
Microwave drying equipment is a non-standard customized product. The specific power size and design need to be combined with the product technology, so that the effect will be maximized.
The effect of microwave drying equipment power on product drying effect!
The traditional heating and drying methods: steam, hot air, and coal burning, use heat conduction to heat from outside and inside, long time, low efficiency, uneven heating, and high energy consumption. The emergence of microwave drying equipment precisely handles the above problems and is now being used in large areas in the food, chemical and pharmaceutical industries.