The basic principle and characteristics of indoor plywood

The basic principle and characteristics of indoor plywood

In order to improve the properties of natural wood, indoor plywood can make the properties of plywood uniform and its shape stable. Generally speaking, plywood must follow two basic principles in structure: one is symmetrical and the other is the veneer with adjacent layers perpendicular to each other. Symmetry principle requires plywood veneer on both sides of the center plane, regardless of wood properties, veneer thickness, layer number, fiber direction, water content and so on, should be symmetrical.

Indoor plywood in the same plywood can be used single tree and veneer thickness, or different tree species and thickness veneer, but the symmetrical veneer tree and thickness of any two layers on both sides of the center plane are the same. The rear panel allows for different species.

The plywood structure for indoor use meets the above two basic principles at the same time, and the number of floors should be odd. Therefore, plywood is usually divided into three layers, five layers, seven layers and other odd layers. The name of each layer of plywood is: the surface veneer is called the table, the inner veneer is called the core board, the front panel is called the panel, and the rear panel is called the rear panel. In the core board, the fiber direction is parallel to the plate. It is called long core board or middle core board. When forming the cavity plate, the panel and the back plate must face outward.