The material is subjected to microwaves from all directions in the microwave field. The microwaves have the function of penetrating into the material. The penetration of microwaves makes the microwaves consistent in the appearance of the material to be dried when the material is dried. Because of the temperature gradient, microwave technology can be applied to the drying of wood, medicinal materials, pills, powders, and puffing and drying of chemical products. It has unique advantages and can solve the drying problems that cannot be solved by conventional methods and achieve a better drying effect than conventional methods.
Microwave dried wood has the following five advantages.
(1) Fast speed practice shows that from 8mm thick sheet to 50mm cube, the water content is from 35% to 40% to about 20%, the drying time is about 10 to 26 minutes, and the speed is 20 of the traditional steam drying technology. ~ 30 times.
(2) High efficiency The penetration of microwaves makes the material directly affected by microwaves in the microwave field, so the drying efficiency is high. Through the drying tests on all types of tree species, the following results were obtained under the same basic conditions:
1 The dehydration rate of all kinds of wood species is around lkg/kW·h or slightly over;
2 When the same kind of wood has the same thickness specification, the dehydration rate is also about lkg/kW·h;
(3) The length of the same wood in the fiber direction is different, the drying effect is obviously different, and the fiber length is short and the water extraction rate is high; otherwise, the water extraction rate is low.
(3) Good quality Because the microwave has the characteristics of strong permeability and heating, the shrinkage of the wood between the top and the bottom, the ends and the middle fiber of the wood during the drying process is relatively consistent, so the cracking and deformation are small, and the microwave drying of the wood Utilization can be increased by at least 5%.
(4) Microwave drying of wood can kill aphids and various bacteria in the wood.
(5) The microwave-dried wood is not affected by natural conditions and does not require a large space.
Characteristics of Microwave Drying Equipment (1) The product is composed of multiple independent low-power microwave sources.
(2) Each independent microwave source does not require large electromagnetic and water circulation systems, which reduces manufacturing costs.
(3) The combination of multi-cavity and multi-microwave sources makes the field strength evenly distributed and ensures good processing quality.
(4) Due to the dispersion of power, the field strength at the outlet end is small, and the leakage is easy to control with respect to the large power field strength.
(5) The multi-cavity and multi-microwave source structure makes product maintenance and replacement of parts simple and convenient. Even if individual microwave sources do not work, the whole machine can still operate normally and avoid the downtime. Stop production loss.
(6) The service life of the magnetron can be as long as about 1000-15000h.
(7) The chamber and housing are made of stainless steel. For long-term use, only a small number of electrical components need to be replaced. The maintenance and maintenance costs are low.
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