Microwave drying characteristics of wood dielectric loss per unit volume cos 65507 One is to increase the voltage U, the two is the plus frequency f.
But the residual rate method is more economical than increasing voltage. Therefore,
is widely used to dry wood, namely wood wave drying. The absorption mechanism of microwave in wood drying process now lets us use the spectroscopic point of view, the microscopic mechanism of wood drying. Wood is made from cellulose, hemifibre and lignin. They are polymer compounds with large molecular weight and degree of polymerization. Especially for wood cellulose molecules, the degree of polymerization can reach more than 100002.
The microwave drying of wood mainly removes the water content of the material, and the water is polyatomic molecules. Because cellulose is 0% in the cell of wood, we mainly discuss the molecular and water molecules of lignocellulose when exploring the drying mechanism of microwave wood.
Because the fiber molecule is a molecule and the water is a polyatomic molecule, the rotational inertia of the molecule is larger, and the coupling of the harmonic lines is more complex than that of the diatomic partition. But their absorption mechanism for electromagnetic wave energy is still similar to diatomic molecules.
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