Do you know what the basic principles of plywood are? Let's follow the editor of Film Faced Plywood For sale for a brief understanding!
In order to improve the anisotropic properties of natural wood as much as possible, so that the properties of plywood are uniform and the shape is stable, the general plywood structure must comply with two basic principles: one is symmetry; the other is that adjacent layers of veneer fibers are perpendicular to each other. The principle of symmetry is that the veneers on both sides of the symmetrical center plane of the plywood should be symmetrical to each other regardless of the nature of the wood, the thickness of the veneer, the number of layers, the direction of the fibers, and the moisture content. In the same plywood, veneers of a single species and thickness can be used, or veneers of different species and thicknesses can be used; however, any two layers of veneer that are symmetrical to each other on both sides of the symmetrical center plane must be of the same species and thickness. The front and back panels are allowed to be different from the same tree species.

To make the structure of plywood meet the above two basic principles at the same time, its number of layers should be odd. Therefore, plywood is usually made of three layers, five layers, seven layers and other odd layers. The names of each layer of plywood are: the surface veneer is called the surface board, and the inner veneer is called the core board; the front surface board is called the front board, and the back surface board is called the back board; in the core board, the fiber direction is parallel to the surface board is called long core board or medium board. When forming a cavity deck slab, the front and back plates need to be facing outwards.
The above is the editor of Film Faced Plywood For sale:A brief introduction to the basic principles of plywood.