What are the methods of wood drying? What advantages do you not know?
Release time:
2021-06-30
According to the different heating methods of wood, it can be divided into convection drying, dielectric drying, radiation drying and contact drying. Laisford fire decorative board that the production of wood drying mainly uses convection drying and dielectric drying. Convection drying mainly includes atmospheric drying, conventional chamber (kiln) drying, dehumidification drying, vacuum drying (intermittent), solar drying and so on. Dielectric drying mainly includes microwave drying and high frequency drying.
Wood drying methods are mainly divided into two categories, namely natural drying and artificial drying.
According to the different heating methods of wood, it can be divided into convection drying, dielectric drying, radiation drying and contact drying. Laisford fire decorative board that the production of wood drying mainly uses convection drying and dielectric drying. Convection drying mainly includes atmospheric drying, conventional chamber (kiln) drying, dehumidification drying, vacuum drying (intermittent), solar drying and so on. Dielectric drying mainly includes microwave drying and high frequency drying.
Natural drying is also known as natural drying, and atmospheric drying is the main form of natural drying, referred to as air drying. Atmospheric drying means that the wood is stacked in an open field or under a ventilated shed, and the water in the wood is dried by using atmospheric heat energy.
Since the use of wood, the first drying method used by humans is atmospheric drying, and even now it is used. In fact, when a newly felled tree forms a log, from the moment it is completely separated from the roots of the tree, it is in a state of drying, and naturally drying. This is because there is more water in the trees and it evaporates into the air. If we do not intervene, its water will continue to evaporate until its water content is basically similar to or basically balanced with the water in the ambient air in which it is located, and it will no longer evaporate water into the air. At this point, the log can be processed and used in this environment. When people use the atmospheric drying method to dry the wood, it is not carried out in the case of logs, but according to the requirements of the product, the logs are sawn into a certain size of sawn timber (plate square), and then according to the natural drying technical process procedures to dry the wood.
The advantages of atmospheric drying are: energy saving, less investment, simple technology, easy operation, low drying cost, and can keep the color of wood basically unchanged. The disadvantages are: the land area is large, the drying conditions can not be controlled, the drying time is relatively too long, the wood is easy to produce drying defects, because it is dried in an atmospheric environment, so the moisture content in the wood can not be dried to the required value. In modern wood drying production, atmospheric drying is only an auxiliary method, and the conventional chamber drying method is the main drying method at present.
Conventional chamber (kiln) drying refers to the use of wood drying chamber (kiln) to dry wood. It can artificially control the drying conditions for wood drying treatment, referred to as chamber drying or kiln drying. At present, in wood drying production at home and abroad, conventional chamber drying accounts for 85%~90% of wood drying production. The heat source used is a steam heater and a steam boiler is required. The advantages of conventional chamber drying are that it can ensure the drying quality of wood of any tree species and thickness, dry the moisture content of wood to any state required, the drying cycle is short, the equipment operation is flexible, the drying conditions are easy to master, and it is easy to realize the mechanical automation of wood drying production. The disadvantage is that the drying equipment is more complex, the one-time investment is large, the energy consumption is relatively large, and the drying cost is relatively high. According to the range of temperature control in the drying room, conventional room drying can be divided into three types: 45-60 ℃ low temperature drying, 60-100 ℃ normal temperature drying and high temperature drying greater than 100℃. Under normal circumstances, the combination of low temperature drying and normal temperature drying is mostly used for wood that is difficult to dry or easy to dry but with large thickness. Some wood that is easy to dry and with small thickness can be dried at high temperature. Atmospheric drying and conventional chamber drying are both traditional wood drying methods, and they are collectively referred to as conventional drying.
In addition to the above two drying methods, there are dehumidification drying, vacuum drying, microwave drying and solar drying methods. They each have their own advantages and disadvantages, because of their use scope and conditions and other factors limited, has not been widely used
Founded in 2002, Yichang Wuxing Material Technology Co., Ltd. is located in Chengbei Industrial Park, Yuan 'an County, Hubei Province, with convenient transportation and beautiful environment. The company covers an area of more than 80,000 square meters, with 3 hot pressing lines and 4 impregnating lines, with an annual output of more than 3.5 million plates, is the production of fireproof board, PCB phenolic board, metal plate, bending board, wall hanging board, antibacterial board, CPL new sheet, expansion of fireproof board professional manufacturers, is the first research and development and production of Losifu antibacterial home products of the national high-tech enterprises.
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