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1. (WO2001030547) METHOD OF MAKING EDGE DENSIFIED LUMBER AND PRODUCT OF THE METHOD

Pub. No.:    WO/2001/030547    International Application No.:    PCT/US2000/025158
Publication Date: Fri May 04 01:59:59 CEST 2001 International Filing Date: Fri Sep 15 01:59:59 CEST 2000
IPC: B27D 1/04
B27M 3/00
E04C 3/14
E04C 3/18
E04C 3/29
Applicants: WEYERHAEUSER COMPANY
Inventors: MACPHERSON, Gerald, N.
BASSETT, Kendall, H.
Title: METHOD OF MAKING EDGE DENSIFIED LUMBER AND PRODUCT OF THE METHOD
Abstract:
The invention is an edge densified lumber product (22) of improved strength and stiffness and the method of its manufacture. The method is based on the parallel lamination of multiple plies of wood veneer (24, 26, 28, 30). Narrow longitudinal reinforcing strips (32) are laid along each edge of the veneer assembly between at least some of the veneer plies. Additional spaced apart veneer strips (34), about twice the width of the edge strips (32), are laid up at preselected locations in the mid-portion of the veneer assembly. These strips in the mid-portion are preferably spaced so that the distance between their centerlines corresponds to standard lumber widths. Appropriate adhesives are used to bond the assembly. The assembly is pressed to a uniform thickness so that the areas along the narrow veneer strips are densified relative to the adjacent portions. Longitudinal saw cuts are then made along the centerlines of the interior veneer strips to separate the assembly into multiple units of lumber. Bending strength and stiffness is significantly increased by having the densified areas along each edge of the resulting lumber units.