METHOD OF INCREASING STRENGTH AND / OR DECREASING ITS DEVIATIONS IN MULTILAYER WOOD, PLYWOOD OR LAYERED WOOD MATERIALS Russian patent published in 2005 - IPC

FIELD: woodworking industry; production of multilayer wood materials, plywood or layered materials.

SUBSTANCE: the invention is pertaining to the field of woodworking industry, in particular, to a method of increasing strength and-or decreasing its deviations in the multilayered wood materials, plywood and the similar wood materials. The method includes measuring of the density (ρ) of the dry substance of the wood veneer sheets by means of a high-frequency electromagnetic resonance and additionally - the analysis of uniformity and-or a fibrous structure of the indicated sheets using darkening (R) their surfaces. In the case when a sheet of the wood veneer contains some number of the local first areas, which are more dark than the main darkening of the wood veneer sheet surface, such sheet has its own calculated density (ρc) of the dry substance set on the more low level as compared with its originally measured value (ρm) of the dry substance. On the other hand, if the wood veneer sheet has essentially homogeneous darkening, for this sheet they estimate the longitudinal and transversal distribution of its density of the dry substance. If these parameters are essentially uniform, then for the process of sorting the calculated density (ρc) of the dry substance of the indicated wood veneer sheet is set higher, than its originally measured value (ρm). the wood veneer sheets assort On the basis of the indicated calculated dry substance densities the wood veneer sheets are assorted at least into two different categories of density. In the first such category (A) the density of the dry substance is higher, than in the second category (B). The wood veneer sheets are laid face to face for forming a laminated wood, plywood or any other laminated material. At that, the wood veneer sheets referred to the first and the second categories of density serve accordingly as the surface sheets and the middle sheets.

EFFECT: the invention ensures an increase of strength and/or a decrease of its deviation values of the dry substance in the multilayered wood materials, plywood and the similar wood materials.

21 cl, 8 dwg