Plywood consists of several layers of an interline interval, and the direction of fibers which are densely stuck together on thickness in the next layers of an interline interval, are generally mutually perpendicular.
However also the special types of plywood calculated on the increased resistance to a bend and torsion are made. These products stick together so that the directions of fibers of an interline interval settle down under other corners — 30o, 45o and 60o — in relation to adjacent layers or any sheet edge. Thanks to this circumstance in comparison with timber plywood possesses smaller anisotropy (physicomechanical properties of plywood are more evenly distributed on the volume of a plywood leaf), is less inclined to swelling, an usykhaniye, a buckling and cracking. Plywood can be made in the form of big sheets at rather small thickness, it easily bends and has some other advantages. All this does plywood by very valuable construction material.