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very hard to bend it perpendicular to the grain direction

Time:2013-4-18 Frome:Site

   Plywood layers (called veneers) are glued together with adjacent plies having their wood grain at right angles to each other to form a composite material. cross-graining has several important benefits: it reduces the tendency of wood to split when nailed at the edges, it reduces expansion and shrinkage equating to improved dimensional stability, and it makes the strength of the panel consistent across both directions. There are usually an odd number of plies so that the sheet is balanced—this reduces warping. 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.
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