Since wood and water are both polar substances, when the steam pressure in the air is greater than the steam pressure of the surface moisture of the wood (ie, the wood is drier than air), the wood absorbs the moisture in the air, which is called moisture absorption. Conversely, if the steam pressure in the wood is greater than the vapor pressure in the surrounding air (ie, the wood is wet than the air), the moisture in the wood evaporates into the atmosphere, which is called desorption (drying process). The drying of wood is to take advantage of the hygroscopic properties of wood. On the other hand, due to the hygroscopicity of wood, with the change of ambient temperature and air humidity, the wood will be deformed, warped and cracked, which will reduce the grade of wood material and even become Waste materials. The hygroscopicity of wood directly affects the quality of wood products.
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