Density board includes internal fiber pollution, as well as various fiberboard and particleboard used in furniture manufacturing. It is also known as the waste plate. It is a piece of sawdust, small diameter wood, sawdust, etc. it is cut into a certain standard. It is made of rubber, curing agent, waterproof agent and other wood-based panels, which are pressed under certain temperature and pressure. In addition, some bamboo, straw, bagasse and other fibers were used. This kind of artificial board is called melamine board, which is made of melamine veneer. It is estimated that the formaldehyde content of urea formaldehyde resin binder for MDF production of each mica is generally 200-250kg.
Joinery board is usually called big core board. It is a kind of wood-based panel made of urea formaldehyde resin adhesive, which is used to fix the upper and lower plywood together with a small piece of wood in the middle. The center is made of natural wood and double-sided paste is a very thin veneer core. Big core board is one of the most important materials in decoration.
Joinery board is a kind of decorative material used for interior decoration by urban and rural residents in China. It can be used for furniture, wooden doors, doors and windows, heating covers, curtain boxes, etc. Its waterproof and moisture-proof function is better than particleboard and MDF. However, due to the use of urea formaldehyde resin binder, the indoor environment formed by decoration has formed potential formaldehyde pollution.
Plywood is cut into large blocks along the rings by steam and softening, and wood-based panels are formed by drying, extruding, gluing, shaping, hot pressing and sawing. The number of layers of plywood sawdust should be odd, usually 3 to 13 layers, and the adjacent sawdust fibers should be straight when glued together. Plywood is mainly used for solid wood materials, density board, joinery board and finger board decoration and furniture manufacturing. The main production process is wood-based panel, which uses urea formaldehyde resin adhesive to bond three, five, seven and nine layers of veneer.