In a living tree, its fibrous roots continuously transport water from the soil through the trunk to the leaves, so the trunk contains a lot of water. After the living tree is felled and sawn into various specifications of sawn timber, some or most of the moisture remains inside the timber, which is the origin of the moisture in the timber. Boards and squares made from freshly felled trees are called green timber.

Working principle of wooden cans: By using a series of operations such as vacuum, pressure, and heating, a certain concentration of anti-corrosion, flame-retardant, and dyeing solution is injected into wood cells through vacuum, high pressure, and frequency pressure to achieve anti-corrosion, mold, moth, termite, flame retardant, and dyeing effects.