Plywood

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Plywood is a type of manufactured wood made from thin sheets of wood. The layers are glued together so that adjacent plies have their wood grain at right angles to each other for greater strength. There are an odd number of plies, as symmetry makes the board less prone to warping.

Contents

Types

A number of varieties of plywood exist for different applications.

Tropical plywood

Tropical plywood is always made of mixed species of tropical wood in the Asian region. Tropical plywood boasts its superiority over softwood plywood due to its density, strength, evenness of layers, and high quality. It is usually sold at a premium in many markets if manufactured with high standards. Tropical plywood is widely used in UK, Japan, Taiwan, Korea, Dubai, and other major cities worldwide. It is the most preferred choice for construction purposes in many regions.

Softwood plywood

Softwood panel is usually made either of Douglas fir or spruce, pine, and fir (collectively known as spruce-pine-fir or SPF), and is typically used for construction and industrial purposes.[1]

Manufacture

Plywood is one of the most widely used wood products. It is flexible, cheap, workable, recyclable, and can usually be locally manufactured. Plywood is made from thin layers of wood that are peeled from logs. These layers (called veneers) are then glued together,under heat and pressure, with the grain direction of each layer perpendicular to that of the next layer, to make plywood. There are usually an odd number of layers so that the sheet is balanced—this prevents warping. A four ply panel exists used for sheathing which has two parallel cross-bands. Because of the way plywood is bonded (with grains running against one another and with an odd number of composite parts) it is very hard to bend it perpendicular to the grain direction. A common reason for using plywood instead of plain wood is its resistance to cracking, shrinkage, twisting/warping, and its general high degree of strength.

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