Plywood according to the number of layers can be divided into three plywood, five plywood, nine plywood, 12 plywood, 18 plywood and so on, the most commonly used in the decoration is three plywood and five plywood, that is, we usually say three plywood and five plywood. The more layers of splint, the greater the thickness, the higher the strength, the stronger the bearing force, the more difficult to bend. Splint is used in high-grade decoration base structure.