The free formaldehyde produced in wood furniture mainly comes from three sources: ① Artificial board, mainly including medium density fiberboard, particle board, plywood and blockboard, is generally used as the base material of furniture, including decorative wood-based panel.

Domestic wood veneer: the sales volume of strong varieties ranks first, and the product price has not been adjusted. According to the veneer dealers in the Xingye wood market,

Wood has good mechanical properties, but wood is an organic anisotropic material, and the mechanical properties of the CIS direction and the trans direction are very different.

It refers to the weight of wood per unit volume. The weight and volume of wood are affected by moisture content. The ratio of the dried weight of the wood sample to its saturated water volume,

Also called defects, they can be divided into three categories:① Natural defects. Such as knots, oblique textures and defects caused by growth stress or natural damage. Knots are the branches wrapped in the xylem when a tree grows. Twill texture of logs is often called twist texture, and sawn wood is called twill texture.