All parts of a growing tree are always saturated with water. Water is harmful to wood, no matter what it is used for and needs to be dried quickly after felling. Wet round timber (logs) can be cut into planks, chopped for pulp cooking, and used in the production of other semi-finished products. However, wet timber is not suitable for any end use at all such as construction, machining (planing, cutting, and grinding), gluing, finishing, and painting.
Therefore, all timber must be dried (seasoned) no matter the intention that it will be used for. The traditional method of timber drying is simply natural air drying. It is performed outdoors in covered stacks or in shelters. Solar and wind energy gradually evaporates the moisture in the wood. That kind of drying, on the other hand, is also very risky. Under good atmospheric conditions (when the weather is dry, sunny, and windy), the wood dries too quickly and at time can warp. As a result, wood can be completely damaged if not dried properly.
Meanwhile, under bad atmospheric conditions (when it is damp, cooler, and there is a lack of airflow), the wood becomes infected with rotting bacteria, mould, and it eventually becomes irreparably blue. Blueness is also brought about by often occurring acid rain.
The air-drying time of wood depends on the climate and weather conditions. However, wood that dries in such a way is often infected with fungi and it also warps due to uneven drying in different parts of the wood. As a result, an artificial drying method is used with special dryers and when the mode is precisely set, the drying times improves with better results than the natural way.