Wood drying furnace

It is the heat that slowly spreads from the surface of the object to the inside, and the microwave drying of wood directly acts on the whole wood, and the moisture contained in the wood and the wood itself directly absorb microwave energy for heating. Because the moisture on the surface of the material is easy to evaporate, the temperature inside the material is about higher than that on the surface. There is a certain pressure difference between the inside and outside of wood, which accelerates the surface migration of water. Microwave drying of wood takes wood as dielectric, which causes polarization of water molecules in wood under the action of microwave electromagnetic field. Due to the frequent alternation of electromagnetic fields, water molecules in wood move violently, friction generates heat, and the overall temperature of wood rises, thus achieving the purpose of wood drying. When microwave is applied to wood, different drying temperatures should be adopted according to different varieties. If the temperature is too high and the internal pressure is too high, the wood will crack inside. If the temperature is too low, the drying speed of wood will be too slow. When the internal temperature of wood is higher than 100℃, excessive water vapor pressure will be generated inside wood, which will accelerate the movement of water molecules. Therefore, the speed of microwave drying wood is much higher than that of convection drying (natural drying, steam drying, infrared drying, etc.). ).

superiority

1, fast drying speed and high efficiency. According to the data, the drying speed of 25-50 ㎜ pine board is 20-30 times faster than that of ordinary convection drying. It only takes 2-4 hours for the moisture content of wood to drop from 30% to 12%.

2. The dried wood is uniform, without deformation and cracking. Because the microwave acts on the inside and outside of the wood at the same time, the heat is even, so the wood after microwave treatment is dried evenly and thoroughly, the product quality is improved, the surface is not hardened, and the toughness is improved, ensuring no cracking, deformation, discoloration and bending correction.

3, moth-proof, mildew-proof, extend the shelf life. Microwave drying of wood can penetrate the interior of wood and quickly kill parasitic eggs in wood, thus achieving the functions of moth prevention, mildew prevention and prolonging the shelf life.

4. High efficiency and energy saving. Using far infrared rays and steam energy to dry wood, the energy utilization rate is less than 50%, while using microwave as energy can reach more than 75%, which is lower than far infrared rays and steam drying by more than 25%.

5. It is convenient to operate and saves manpower. Using the principle that microwave can be turned on and off instantly, the operation and management are simple, the labor intensity is reduced and the manpower is saved.

6. Safety, health and environmental protection. Microwave treatment of wood has no noise, no pollution and no "three wastes" problem.