In order to improve the characteristics of natural wood anisotropy, so that the characteristics of the plywood uniform, stable shape, the general plywood in the structure must comply with two basic principles: one is symmetrical, the second is the adjacent layer of single-board fiber to each other straight. The principle of symmetry is to require the plywood symmetry center plane at both ends of the veneer, regardless of wood properties, veneer thickness, layer number, fiber direction, moisture content, etc., should be symmetrical with each other. In the same plywood, a single tree and thickness of veneer can be used, but also the use of different tree species and thickness of the veneer, but the symmetry of the center plane of any two layers of symmetrical single-plate tree species and thickness to be the same. The surface backplane allows not the same tree species.
In order for the structure of the plywood to conform to the above two basic principles, its number of layers should be odd. So plywood is generally made of 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 plate, the inner layer of the veneer is called the core board, the front of the table is called the panel, the poor table board is called the backplane, the core plate, the fiber direction is parallel to the table plate is called the long core plate or the plate. In the formation of the chamber slab Slab, the panel and backplane are necessary to face outward.
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