The natural features of wood, such as mineral lines, color and texture changes, needle sections, resin bags and other natural imprints, all make European solid wood furniture more natural aesthetic.At the same time, the quality of wood is also an important factor in determining the quality of European-style solid wood furniture, then let us introduce the factors that affect wood.
Temperature is the main factor affecting the drying rate of wood. As the temperature increases, the moisture pressure in the wood increases, and the viscosity of liquid free water decreases, it is beneficial to promote the flow and diffusion of water in the wood. The wetting capacity of copper wire drying medium is improved, which accelerates the evaporation speed of moisture on the surface of wood. However, it is worth noting that if the temperature is too high, it will cause the cracking and deformation of wood, reduce the mechanical strength, discoloration, etc., should be properly controlled. Relative humidity is also an important factor affecting the drying speed of wood. In the case of the same temperature and air flow speed, the higher the relative humidity, the greater the water vapor pressure in the medium, the more difficult it is to evaporate moisture from the surface of the wood to the medium, and the slower the drying speed will be. When the relative humidity is low, the surface moisture evaporates quickly, the surface moisture is reduced, the moisture content gradient increases, the water diffusion increases, and the drying speed is fast.
However, the relative humidity is too low, will cause cracking and honeycomb and other drying defects problems or even aggravate.
The speed of air flow circulation is another factor that affects the drying speed of wood. High-speed air currents can destroy the saturated steam boundary layer on the surface of the wood, thus improving heat transfer and mass transfer conditions between the medium and the wood, and speeding up the drying speed. For difficult to dry material or when the moisture content of wood is low, the inner moisture movement of wood determines the drying speed, by increasing the flow rate of large medium to speed up the evaporation rate of surface moisture is not meaningful, but will increase the water content gradient, increase the risk of drying defects. Therefore, the hard-to-dry material does not require a large medium cycle speed
These three factors can be artificially controlled external factors, propercontrol, can ensure the quality of wood drying on the premise of speeding up the drying speed. For example, when drying conifer or soft broad-leaved sheet, because the internal moisture movement of the wood is easy, can be appropriateto improve the dry ball temperature, reduce the media humidity, improve the flow rate of the air flow cycle to speed up the drying speed, but when drying mahogany wood or thick plate, it is advisable to use a lower temperature, higher humidity and a smaller air flow cycle speed, so as not to produce drying defects.
The wood of different tree species has different structures, the size and quantity of its pores, and the size of micropores on the grain film are very different, so the degree of difficulty of water moving along the above path is different, that is, wood tree species is the main internal cause of the effect of drying speed. Because of the large filling in the ring-hole hard broad-leaved tree conduit and the textured hole, the diameter of the micro-porous on the grain-hole membrane is small, so its drying speed is significantly smaller than that of the loose-hole broad-leaved tree material.
The conventional drying process of wood can be approximated as a one-dimensional heat transfer process along the thick direction of the material, the thickness is increased, the distance of heat transfer becomes longer, the resistance increases, and the drying speed decreases significantly. Under the fiber saturation point, with the decrease of water content, the transverse diffusion coefficient of water absorption decreases, while the diffusion coefficient of water vapor in the cell cavity increases, because the proportion of water vapor diffusion in the cell cavity is not large, the lower the water content, the longer the diffusion path, so the lower the water content is more difficult to dry.
Although the internal causes of solid wood can not be controlled, but as long as the characteristics of solid wood due to snobbish guidance, reasonable use of drying equipment and technology, the same can improve the drying speed, not only to reduce unnecessary losses, but also to enable our solid wood European-style furniture, the above is my summary of the wood decision European-style solid wood furniture good or bad factors, Hope to understand the European-style solid wood furniture to help.