1: Fast drying speed
Good equipment performance is the basis of wood drying and the premise of implementing drying technology. Microwave drying of wood The difference between room drying and ordinary drying is that the heat is not transmitted by the external surface of the object, but the microwave is directly heated through the absorption of the water molecules contained in the material and the wood itself. The microwave is a direct interaction between high-frequency microwave and the dried product. The permeability of microwave energy makes the object heated inside and outside at the same time, and the internal moisture is rapidly vaporized by heating, The strong "pressure pad" that spreads outward forces the internal moisture to spread out rapidly, thus accelerating the drying speed. If the wood moisture content is reduced from 35% - 40% to 20%, the drying time is about 15-30 minutes. It is 20-30 times of steam drying process.
2: High efficiency of microwave drying wood
The traditional drying process often lasts for several days or even dozens of days. However, microwave drying of wood only takes a few minutes, greatly reducing the drying time. Generally, the water extraction rate standard is used as the assessment standard when treating wood. Due to different tree species and wood hardness, the moisture content of wood after microwave drying is uniform. Drying wood by microwave without humidity adjustment. Good drying effect was obtained.
3: Good quality of microwave drying materials
The microwave drying of wood has strong permeability and heating selectivity, so the shrinkage of the intermediate fibers at both ends of the interior and exterior of the wood is consistent during the drying process, so the cracking and deformation of the wood are small. The dried wood shall be uniform, free from deformation and cracking. Since the microwave acts on the internal and external parts of the wood at the same time, the heating is uniform, so the microwave treated wood can be dried evenly and thoroughly to improve the product quality. The surface will not harden, improve the toughness, and ensure that it will not crack, deform, discolor, and correct the bending degree. However, the traditional drying method will appear deformation, cracking, mildew, deterioration and other phenomena, which will seriously affect the quality of wood, resulting in a large number of wood scrap. Using microwave to dry wood, the utilization rate of wood can be increased by about 10%. Microwave has a strong penetration ability to wood, which has nothing to do with the shape and size of wood, overcoming the phenomenon of external heat and internal cooling caused by traditional heating and drying
4: Microwave drying wood and killing pests
Microwave drying wood kills pests at the same time, which is due to the strong resonance effect of microwave electromagnetic energy and water molecules in wood. Anti moth, anti mildew, extended shelf life. Microwave drying of wood can penetrate the interior of wood, and use the parasitic eggs in wood to quickly kill, so as to prevent borers, mold and extend the storage period. The harmful borers and larvae inside the wood were all killed at the same time. At that time, the treatment temperature was 70-80 ℃, which only took a few minutes.
5: To save floor space and improve working conditions, microwave directly acts on the corresponding materials, so there is no additional heat loss, and the air in the furnace cavity and the corresponding container must not be heated, so the efficiency is improved and the production environment is significantly improved. The energy utilization rate of wood drying with far-infrared and steam energy is less than 50%, while the utilization rate of microwave energy can reach more than 85%, which is about 30% lower than that of far-infrared and steam drying. With the traditional steam heating drying, hot water heating drying. Compared with hot oil heating and drying, indirect furnace gas heating and drying and heat pump dehumidification drying of wood can save 30% of energy, thus reducing production costs. The equipment covers a small area (about ten square meters), and saves production and processing sites.
6: Easy to control Excellent workmanship
Compared with the traditional method, the device can be used immediately without thermal inertia and is flexible and convenient to operate. Each set of equipment can be produced with 2 workers, which saves the labor force for production. The microwave power and transmission speed are adjustable. It is a reliable high-tech product.
7. Clean, hygienic and environmentally friendly. Microwave treatment of wood has no noise, no waste, and no "three wastes" problem.
How to use microwave energy to dry wood, the key problem is the choice of technology. Scientific and reasonable process procedures must be selected and formulated, and the process procedures should be determined in combination with the power of equipment and the wood structure of different tree species, and the operation should be strictly carried out to ensure product quality and achieve better drying effect.
