Solid wood furniture refers to pure solid wood furniture, that is, all materials are natural materials that have not been reprocessed, and do not use any wood-based furniture. Jackie Chan furniture http://cljj.cnjiaju.com/share
Because there are no two identical trees and two identical materials, each product has its own unique characteristics. The natural properties of wood, such as mineral threads, color and texture changes, needle joints, resin capsules and other natural marks. It makes the furniture more natural and beautiful. At the same time, the quality of wood is also an important factor in determining the quality of solid wood furniture. So what other factors will affect the quality of wood?
First, external factors
1. Temperature and temperature are the main factors affecting the drying speed of wood. When 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 moisture in the wood; the drying capacity of the copper wire drying medium is increased, and the evaporation rate of the surface moisture of the wood is accelerated. However, it is worth noting that if the temperature is too high, it will cause cracking and deformation of wood, reduce mechanical strength, discoloration, etc., and should be properly controlled.
2, humidity relative humidity is an important factor affecting the drying speed 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 more the water on the surface of the wood is less likely to evaporate into the medium, the slower the drying speed; when the relative humidity is low, the surface moisture evaporates quickly. The surface water content is reduced, the water content gradient is increased, the water diffusion is increased, and the drying speed is fast. However, if the relative humidity is too low, cracking and drying defects such as honeycombs may occur or even worsen.
3. Air circulation rate Air circulation speed is another factor that affects the drying speed of wood. The high-speed airflow can destroy the saturated vapor boundary layer on the surface of the wood, thereby improving the heat transfer and mass transfer conditions between the medium and the wood, and accelerating the drying speed. For difficult dry materials or when the moisture content of wood is low, the moisture movement inside the wood determines the drying speed; it is not practical to increase the evaporation rate of surface moisture by increasing the flow rate of large medium, but it will increase the water content gradient and increase the drying. The danger of defects. Therefore, difficult materials do not require a large media circulation speed.
Second, the internal factors
1. Wood species and structural characteristics Wood of different tree species has different structures. The size and number of pits and the size of micropores on the pit membrane are very different. Therefore, the difficulty of moving water along the above path is No, that is, wood species are the main internal factors that affect the drying speed. Due to the large number of fillings in the cavities and pits of the hard-boiled hardwood (such as rosewood) and the small diameter of the micropores in the perforated membrane, the drying speed is significantly smaller than that of the loose-leaved broad-leaved trees; in the same tree species, the density increases. The resistance of water flow in the large capillary tube increases, the water diffusion path in the cell wall is prolonged, and it is difficult to dry.
2. Wood thickness The conventional drying process of wood can be approximated as a one-dimensional heat and mass transfer process along the thickness direction of the material. The thickness increases, the heat and mass transfer distance becomes longer, the resistance increases, and the drying speed decreases significantly.
3. Wood moisture content Under the fiber saturation point, as the water content decreases, the lateral diffusion coefficient of the sorbed water decreases, and the diffusion coefficient of water vapor in the cell cavity increases, due to the water vapor in the cell cavity during the drying process. The proportion of medium diffusion is small, and the lower the water content, the longer the water diffusion path, so the lower the water content, the more difficult it is to dry.
4, wood heartwood material broad-leaved tree heartwood cells contain more content, the pores in the coniferous heartwood are mostly occluded, so the heartwood is more difficult to dry than the sapwood.
5, the wood grain direction wood ray is conducive to moisture conduction, the water conduction in the radial direction of the wood is about 15% - 20% larger than the chord direction, so the string cutting board is usually faster than the diameter of the diameter cutting board.
We are specialized in plush toy since 1993. We are a very strong OEM&ODM team. Annually, there are more than 250 new items for our customer to select.Till now, there are more than 8500SKU.
We have a very strong OEM&ODM designing team. Annually, we will design more than 200 new items for our customer to select. Customized design is welcomed.
Here we provide one stop service from design patterning, sampling, manufacture and quality control. to ensure Safe, Excellent QUALITY & BEAUTIFUL products
Our toys are followed strictly international standards such as EN71 &ASTM963. We have passed BSCI, Sedex certificate.
Pet Toys,Cat Toys,Dog Toys,Pig Toy
Ningbo Dikai Imp&Exp Co., Ltd , https://www.longkaitoys.com