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What are the Types of Plywood?

Sep. 12, 2020

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As a Birch Plywood Manufacturer, share with you. Plywood is a three-layer or multi-layer board-like material that is made of wood pieces that are peeled into veneer or sliced into thin wood, and then glued with adhesive. Usually, odd-numbered veneers are used and adjacent layers of veneers are used. The fiber directions are glued perpendicular to each other.

Birch Plywood

Birch Plywood

Plywood is one of the commonly used materials for furniture. It is one of the three major panels of wood-based panels. It can also be used as a material for aircraft, ships, trains, automobiles, buildings, and packaging boxes. A group of veneers are usually formed by gluing the adjacent layers of wood grains perpendicular to each other. The surface and inner plates are usually symmetrically arranged on both sides of the central layer or core. The glued veneer is made of slabs criss-crossed in the wood grain direction and pressed under heating or non-heating conditions. The number of layers is generally odd, and a few have even numbers. There is little difference in physical and mechanical properties in the vertical and horizontal directions.

The main tree species are: beech, camphor, willow, poplar, eucalyptus, etc.

In order to improve the anisotropy 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 the fibers of adjacent layers of veneer 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 symmetric center plane should be the same. 

Species:

In order to make full and reasonable use of forest resources to develop plywood production and make the best use of materials, plywood is divided into plywood for finishing and plywood for decoration. Generally, plywood and veneer are used for decorative plywood. The types of plywood are divided into:

(1) Class I (NQF)-weather-resistant, boiling water-resistant plywood. 

Plywood is durable, resistant to boiling or steam treatment, and can be used outdoors.

(2) Class II (Ns)-water-resistant plywood.

It can withstand cold water or short-term hot water immersion, but it is not resistant to boiling.

(3) Class III (Nc)-non-moisture-resistant plywood.

Our company also has Birch Plywood on sale, welcome to contact us.