Plywood, also known as plywood, is made by cooking and softening logs, cutting them into large pieces along the annual rings, drying, sorting, gluing, splicing, hot pressing and sawing. The number of layers of wood chips should be odd, and the bonding time should make the fibers of adjacent wood chips perpendicular to each other. There are four grades of plywood: super grade, first grade, second grade and third grade. The specifications of the splint are 2440mm long and 1220mm wide. The thickness of plywood with different specifications is different, but it is generally a multiple of 3.
Splints are divided into three splints, five splints, nine splints, twelve splints, fifteen splints and eighteen splints according to their thickness. From the material can be divided into willow, poplar, rock sugar, white clouds, osmanthus and so on. , and from the point of view of the number of plywood gluing, it can be divided into three-layer thick core board and multi-layer core board.