Abstract: The invention is an edge densified lumber product 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. Narrow longitudinal reinforcing strips are laid along each edge of the veneer assembly between at least some of the veneer plies. Additional spaced apart veneer strips, about twice the width of the edge strips, 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.

Abstract: The invention is an edge densified lumber product 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. Narrow longitudinal reinforcing strips are laid along each edge of the veneer assembly between at least some of the veneer plies. Additional spaced apart veneer strips, about twice the width of the edge strips, 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.

Abstract: The invention is an edge densified lumber product 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. Narrow longitudinal reinforcing strips are laid along each edge of the veneer assembly between at least some of the veneer plies. Additional spaced apart veneer strips, about twice the width of the edge strips, 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.

Abstract: The invention is a method of gluing wood using a reactive two component thermosetting adhesive such as a phenol-resorcinol-formaldehyde (PRF) condensation product. One component is first coated on one of the members to be bonded. The second component is then spread directly on top of the first in a manner to minimize mixing; e.g., by spraying. When the mating member to be bonded is placed against the adhesive coated first member and pressure is applied the components are mixed. This begins the curing reaction between the components so that a thermosetting adhesive bond is formed. With selected adhesives very rapid curing times are possible. A preferred adhesive has a first component comprising a PRF resin mixed with a methylene group donor hardener such as paraformaldehyde. The second part is also a PRF resin. No hardener is present in the second part. Instead an oxygen and nitrogen containing heterocycle is used as an accelerator. Morpholine is a preferred compound.