Plywood is one of the commonly used materials for furniture, and it is a kind of man-made board. Plywood is a three-layer or multi-layer board-like material made of wood pieces that are peeled into veneer or sliced into veneer from wooden squares, and then glued together with an adhesive. Usually an odd-numbered layer of Veneered Plywood is used, and adjacent layers of veneer are used. The fiber direction is perpendicular to each other and glued together.
A group of Veneered Plywood is usually formed by gluing the adjacent layers of wood grains perpendicular to each other. The surface board and the inner board are usually symmetrically arranged on both sides of the center layer or the core. The glued Veneered Plywood is made of slabs crisscrossed 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. Plywood can improve the utilization rate of wood and is a major way to save wood. It can also be used as materials for aircraft, ships, trains, automobiles, buildings and packing boxes.
Plywood is divided into three or more layers of veneer glued into two parts. The vast majority of veneer produced today is spun veneer, often called veneer, usually with odd layers of Veneered Plywood. The fiber directions of adjacent layers of Veneered Plywood are perpendicular to each other. Odd-numbered plywood such as three-in-one, five-in-one, and seven-in-one, the outermost Veneered Plywood is called the surface board, the front surface is called the front panel, the back surface is called the back panel, and the inner Veneered Plywood is called the core board. Or mid-plate.
The composition of the plywood panel is the tree species of the plywood. In China, the commonly used broad-leaved trees are basswood, ash, birch, poplar, elm, maple, color wood, yellow poluo, maple, nanmu, and Schima superba Commonly used coniferous woods are masson pine, Yunnan pine, larch, spruce and so on.
There are many ways to classify plywood, which can be classified according to tree species, such as broad-leaved plywood (birch plywood, tropical hardwood plywood, etc.), coniferous plywood; according to the purpose, it can be divided into ordinary plywood and special plywood, ordinary plywood is Plywood suitable for a wide range of uses, special plywood is to meet special purpose plywood; can be divided into water resistance and durability of the glue layer, ordinary plywood in China is divided into weather-resistant plywood, water-resistant plywood, moisture-resistant plywood and non-moisture-resistant plywood.
According to the structure of plywood, it can be divided into plywood, sandwich plywood and composite plywood. Sandwich plywood is a plywood with a core, and composite plywood is a core (or some layers) made of materials other than solid wood or veneer. The two sides of the board core should usually have at least two layers of veneers with wood grains arranged perpendicular to each other.
According to the shape of the plywood, it can be divided into flat plywood and shaped plywood. The shaped plywood is a plywood that has been directly pressed into a curved shape in the mold according to the requirements of the product, for special needs, such as corrugated wall panels and ceilings. Plywood and chair backs, back legs, etc.
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