Wood drying refers to the natural and artificial method of forcing the evaporation of water in the wood to reduce the moisture content of the wood to the moisture content of the use requirements, to avoid the erosion of the wet materials during the storage, transportation and use. The wood splits and deforms, improving the quality of wood products and prolonging the service life.

The natural drying method of wood is a drying method using gas convection. Among the artificial drying methods, convection heating and dielectric heating are important: the former has kiln drying, solar drying, suspicion of water drying and centrifugal drying; the latter has microwave drying and high frequency drying. There are also infrared drying methods for radiant heating and contact drying methods for contact heating. At present, convection heating air drying and kiln drying are the main methods at home and abroad, especially kiln drying is the most important method.

When the wood is dry, the moisture on the surface of the wood first evaporates. The moisture content of the surface layer is lower than that inside the wood, and the internal moisture moves to the surface layer under the influence of the water content gradient. The speed of the initial stage of drying depends on the rate of evaporation of the surface water of the wood. In the middle and late stages of drying, the drying speed depends on the speed of movement of the moisture inside the wood, which is inversely proportional to the thickness of the board and the specific gravity of the wood. In addition, the sapwood drying speed is faster than the heart material. The chord panel of broad-leaved trees is faster than the diameter panel; however, the difference in the string surface of coniferous trees is not obvious. The tree species have a great influence on the drying: the easy-to-dry wood has red pine, fish scale spruce, fir fir, red spruce, masson pine, Chinese fir, scotch pine, elm, paulownia, elm, etc. The wood has poplar, color wood, maple, yellow pineapple, walnut, eucalyptus, camphor, eucalyptus, eucalyptus, persimmon, maple, etc.; hard-to-dry wood has larch, ash, Cyclobalanopsis, Cyclobalanopsis, palsy, lotus, alfalfa, Dalbergia, etc.

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