Plywood is the wood along the ring direction peeling National Cheng Kung University Zhang veneer, dried, and the principles of the adhesive after the adjacent laminated veneer grain direction perpendicular group blank and glue from the plate. Veneer layers is an odd number, usually three to thirteen common plywood, five plywood, nine plywood, and 10 plywood. The front of the outermost layer of veneer called the panel opposite called the backplane, the inner plate is called the Core.