plywood

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plywood,

manufactured board composed of an odd number of thin sheets of wood glued together under pressure with grains of the successive layers at right angles. Laminated wood differs from plywood in that the grains of its sheets are parallel. Plywood is noted for its strength, durability, lightness, rigidity, and resistance to splitting and warping. It can be molded into curved or irregular forms for use in truck, airplane, and boat bodies, luggage, furniture, and tubing, or it can be made into large panels suitable for structural use. Plywood was made in ancient Egypt and China, and it was first introduced in the United States in 1865. The two types commonly in use today are those made of softwood (fir) or hardwood (birch, mahogany, walnut, or white ash). The layers in inexpensive plywood are glued together with starch pastes, animal glues, or casein, but those of the strongest plywood are glued with waterproof synthetic resins. Other material, such as metal or fabric, may be substituted for the usual wood core.

plywood

An engineered panel composed of an odd number of thin sheets permanently bonded together, sometimes faced with a veneer. See also: Masonite

Plywood

 

a wood material consisting of two or more sheets of debarked veneer glued together. Birch veneer is the type most commonly used in plywood production, but alder, beech, pine, and other types may also be used. Plywood is usually built up with from three to five plies, with the grains in adjacent plies arranged to run perpendicular to each other. Both synthetic thermosetting adhesives, such as phenol-formaldehyde and carbamide (urea-formaldehyde) resins, and natural adhesives, such as albumin and casein glues, are used for bonding. Sheets of plywood range in thickness from 1 to 19 mm; the length and width range from 725 to 2,440 mm.

Among the special types of plywood are those classified as resin-impregnated (with improved water resistance), decorative (with a finished exterior veneer), and shaped (formed in a compression mold). Plywood has fairly high longitudinal and transverse mechanical strength, low overall density, and significantly lower anisotropy than natural wood. Plywoods are used extensively in the production of motor vehicles, railroad cars, ships, aircraft, furniture, and containers; they are also used to make cabinets for radio and television sets.

REFERENCE

Kirillov, A. N., and E. I. Karasev. Proizvodstvo kleenoi fanery. Moscow, 1968.

I. K. CHERKASOV

plywood

[′plī‚wu̇d]
(materials)
A material composed of thin sheets of wood glued together, with the grains of adjacent sheets oriented at right angles to each other.

plywood

Structural wood made of three or more layers of veneer (usually an odd number), joined with glue; usually laid with the grain of adjoining plies at right angles.
References in periodicals archive ?
The above-mentioned wood species were utilized for making the marine- and shuttering-grade plywood.
Conventional PF resin was used for making the marine-and shuttering-grade plywood.
The CEB (10%, wt/vol) chemical combination was used to treat the plywood and consisted of copper sulfate, mononethanolamine, boric acid, octanoic acid and caprylic acid, and propiconazole-based aqueous solution (Kalawate 2013).
An 8-hour period was chosen with the assumption that resin should remain usable for the entire duration of normal production in the plywood manufacturing industry.
Two types of treatment methods were adopted to treat the plywood for achieving 12 kg/[m.
Laboratory-scale plywood of 12-mm thickness was made using the wood species, viz.
Using conventional pressure control pressing methods, three 5-ply plywood panels were made from each E grade, resulting in a total of nine panels.
Six different lay-up constructions of mixed E grade MPB plywood were manufactured.
Three replicates were used to make a total of eighteen 5-ply mixed grade MPB plywood panels.
Manufacturing of 5-ply mixed grade Douglas-fir plywood
Similar to mixed E grade MPB plywood, mixed E grade Douglas-fir plywood was also manufactured with one additional single E1 grade panel construction.
Three replicates were used to make a total of twenty-one 5-ply mixed E grade Douglas-fir plywood panels.