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Wood construction
The wood of different tree species has different structures. The size and number of the pores and the size of the micropores on the pore membrane are very different. Therefore, the speed of water movement along the above path is different, that is, the wood species affects drying. The main internal cause of speed. Due to the large amount of filler in the ducts and pores of the hardwood broad-leaved wood (such as rosewood) and the small diameter of the micropores in the pore membrane, its drying speed is significantly less than that of the diffuse-hole broad-leaved wood; in the same tree species, the density increases , The resistance of water flow in the large capillary increases, and the diffusion path of water in the cell wall extends, making it difficult to dry.
Wood moisture content
As the water content decreases, the diffusion coefficient of water vapor in the cell cavity increases. Since the proportion of water vapor diffusion in the cell cavity during drying is not large, the lower the water content, the longer the water diffusion path, so the water content The lower the harder to dry.
temperature
Temperature is the main factor affecting the drying speed of wood. As the temperature rises, the water pressure in the wood increases, and the viscosity of the liquid free water decreases, which is conducive to promoting the flow and diffusion of water in the wood; the copper wire drying medium's ability to dissolve moisture increases, accelerating the evaporation rate of water on the wood surface. But it is worth noting that if the temperature is too high, it will cause cracking and deformation of the wood, reduce mechanical strength, discoloration, etc.
humidity
Relative humidity is an important factor affecting the drying rate of wood. In the case of the same temperature and airflow speed, the higher the relative humidity, the greater the partial pressure of water vapor in the medium, the easier the moisture on the wood surface to evaporate into the medium, and the slower the drying speed; when the relative humidity is low, the surface moisture evaporates quickly, The water content of the surface layer is reduced, the water content gradient is increased, the water diffusion speed is accelerated, and the drying speed is fast. However, if the relative humidity is too low, it will cause cracking and drying defects such as honeycomb.
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