Manufacturing Plywood Board

Plywood board is the creation of the wood industry, made from many layers of laminated wood arranged perpendicularly to each other in the direction of the wood grain of each layer. These layers are glued together with formaldehyde glue under the effect of heat and pressure. In the structure of Plywood board, the number of layers of a board is always odd (3, 5, 7, 9…) so that the board has a core layer in the middle, in order to create the same grain direction in two outer layer of the core layer. From there, these layers of wood restrain each other from warping or cracking. As a result, the thin layers on either side of the core layer that are tightly held by the core layer and cannot be broken. It is because of such arrangement of wood layers that Plywood boards do not warp and shrink under normal conditions.