Plywood is a three-layer or multi-layer board-like material made of wood pieces that are peeled into veneers or sliced into thin wood, and then glued with adhesive. Usually, odd-numbered veneers are used and adjacent layers of veneers are used. The fiber directions are glued perpendicular to each other.
Plywood is one of the commonly used materials for furniture. It is one of the three major panels of wood-based panels. It can also be used as a material for aircraft, ships, trains, automobiles, buildings, and packaging boxes. A group of veneers are usually formed by gluing the adjacent layers of wood grains perpendicular to each other. The surface and inner plates are usually symmetrically arranged on both sides of the central layer or core. The glued veneer is made of slabs criss-crossed in the wood grain direction and pressed under heating or non-heating conditions. The number of layers is generally odd, and a few have even numbers. There is little difference in physical and mechanical properties in the vertical and horizontal directions. Commonly used types of plywood are three plywood, five plywood and so on. Plywood can improve the utilization rate of wood and is a main way to save wood.
The usual length and width specifications are: 1220×2440mm, and the thickness specifications are generally: 3, 5, 9, 12, 15, 18mm, etc. The main tree species are: beech, camphor, willow, poplar, eucalyptus, etc.
