PRODUCT MADE OF PLYWOOD WITH INCREASED STABILITY OF DIMENSIONS AND RESISTANCE TO BUCKLING AND FLAKING Russian patent published in 2009 - IPC B32B21/04 

FIELD: construction.

SUBSTANCE: product of plywood is formed by multiple veneer layers of higher quality and multiple veneer layers of lower quality. Veneer layers of higher quality may be made of hardwood, and lower quality layers - from pine wood and hardwood of lower quality, or layers of higher quality may be made of veneer, grade of which is higher than grade C according to standard HP-1-2000 ANSI/HP VA (USA standard for hardwood veneer and decorative veneer), and lower quality layers may be made of veneer, grade of which is not higher than grade C according to standard HP-1-2000 ANSI/HPVA. External layers of veneer are related to layers of higher quality. In most versions of invention realisation, at least two adjacent internal layers are layers of lower quality. In those versions of invention realisation, in which product edge is arranged with collar and groove, or is profiled with creation of closing lock elements, collar comprises parts of at least two layers, and at least one of them is layer of higher quality.

EFFECT: production of plywood product with stability of dimensions and resistance to bucking and flaking.

40 cl, 2 dwg