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What are the Basic Principles of Plywood?

Nov. 12, 2020

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As a Waterproof Plywood Manufacturer, share with you.

In order to improve the anisotropic characteristics of natural wood as much as possible, and make the plywood have uniform characteristics and stable shape, generally plywood must comply with two basic principles in structure: one is symmetry; the other is that adjacent layers of veneer fibers are perpendicular to each other.

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In order to improve the anisotropy of natural wood as much as possible, and make the plywood have uniform characteristics and stable shape, the structure of plywood generally 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 requires that the veneers on both sides of the center plane of symmetry 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 fiber direction, and the moisture content. In the same plywood, you can use a single tree species and thickness of the veneer, you can also use different tree species and thickness of the veneer; but any two layers of symmetrical veneer tree species and thickness on both sides of the symmetry center plane should be the same. The face and back panel may not be 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, 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. It is called long core board or middle board. When forming the cavity table slab, the face plate and the back plate must face outwards.

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In the production of plywood, many varieties of patterns and colors are derived. The most important one is to paste a thin layer of decorative veneer veneer on the original plywood surface, which is called decorative veneer veneer, which is referred to as decoration in the market. Board or veneer.

It is worth noting that common veneers are divided into natural wood veneer veneers and artificial veneer veneers. Natural wood veneer is a veneer veneer made of precious natural wood through slice or rotary cutting processing methods. Artificial veneer is made of relatively low-priced logs by rotary cutting to make veneer, which is pressed into a wooden square by a certain process, and then sliced into a decorative veneer with beautiful patterns.

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