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.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/

plywood

An engineered panel composed of an odd number of thin sheets permanently bonded together, sometimes faced with a veneer. See also: Masonite
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

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.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
has been producing high quality Santa Clara Marine Plywood. The SMWPI plant in Toril, Davao City, follows an established manufacturing process from selection of high density raw materials, modern production techniques, and stringent quality control tests.
Santa Clara Marine Plywood bears stickers with barcode and tracking number, stamped logo and/or laser etching as marks of superior quality to assure customers that it is the best product for weather-proofing homes.
Marine plywood has been extensively used for marine construction purposes.
The plywood was made in two different patterns, Patterns I and II, as listed below.
deltoides) Panel core Eucalyptus Glue core Poplar Panel core Eucalyptus Glue core Poplar Face veneer Gurjan Pattern II: Face veneer Gurjan Glue core Rubber wood (Hevea brasiliensis) Panel core Rubber wood Glue core Rubber wood Panel core Rubber wood Glue core Rubber wood Panel core Rubber wood Glue core Rubber wood Face veneer Gurjan 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 resin had the following properties: flow time, 24 [+ or -] 2 seconds at 25[degrees]C, when measured in a B-4 flow cup according to IS 3944 (BIS 2005); water tolerance, 1:12; solid content, 48 percent.
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).
Three E grades of MPB veneer and three E grades of Douglas-fir veneer were used to make 5-ply 33- by 24-inch plywood panels.
The test panels were manufactured according to the product standard for regular unsanded 5-ply Douglas-fir plywood. Panel thickness was controlled with a tolerance of [0.610.sup.+0.04.sub.-0.02] inch (or [15.5.sup.+1.0.sub.-0.5] mm).
3), plywood gluebond quality, parallel-ply bending performance, and dimensional stability were determined.
For 5-ply MPB plywood, non-stained MPB veneer was placed in the parallel plies for appearance purpose, namely, the face and back, and innermost ply.
Six different lay-up constructions of mixed E grade MPB plywood were manufactured.