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US 5,040,582 AGranted
Multi species laminated veneer lumber
AssigneeForintek Canada Corp.
InventorW. Ernest Hsu
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AssigneeForintek Canada Corp.
InventorW. Ernest Hsu
Estimating the term…
A method of producing laminated veneer lumber (LVL) with good dimensional stability, characterized by a particular lay-up of the veneers and the veneers being of at least two different wood species. The particular veneer lay-up and species arrangement, minimizes the tendency of warping and cracking of the LVL. All veneers are laid-up in pairs by species with the loose sides of each pair contacting each other and with the species pair sequence from face to core being identical on either side of the center ply or center line. The veneer tight faces of different species are bonded to one another. The dimensional stability of the LVL is optionally enhanced by a water repellent, flow promoter and bulking agent that is incorporated into the adhesive before application onto the veneer. The different species veneers are dried to different moisture contents before lay-up with the denser species being of lower moisture content than the less dense species.
In the manufacture of laminated veneer lumber wherein each veneer sheet is made by rotary peeling a log and as a result thereof has a tight face and a loose face and wherein the veneers are stacked face-to-face in a lay-up and including an adhesive between adjacent layers to form a multi layer panel by hot pressing, said panel being cut to provide pieces of laminated veneer lumber, an improved lay-up comprising, placing opposite respective loose and tight faces of the veneer layers in face-to-face relation with the respective loose and tight faces of the next adjacent layer, in substantially all of the layers in the lay-up, using veneers of at least two different wood species, arranging the layers of the different wood species, arranging the layers of the different wood species symmetrically about the central core portion of the complete laid-up panel and arranging the adjacent layers of the different wood species with their tight faces in face-to-face relation.
In the manufacture of laminated veneer lumber wherein each veneer sheet is made by rotary peeling a log and as a result thereof has a tight face and a loose face and wherein the veneers are stacked face-to-face in a lay-up and including an adhesive between adjacent layers to form a multi layer panel by hot pressing, said panel being cut to provide pieces of laminated veneer lumber, an improved lay-up comprising arranging the veneer layers in pairs and with the loose faces in each pair in face-to-face relation, disposing the tight faces of adjacent pair of layers in face-to-face relation, using veneers of at least two different wood species with each pair of layers being of the same wood species and arranging the layers of the different wood species symmetrically about the central core portion of the complete laid-up panel.
In the manufacture of laminated veneer lumber wherein each veneer sheet is made by rotary peeling a log and as a result thereof has a tight face and a loose face and wherein the veneers are stacked face-to-face in a lay-up to form a multi layer panel by hot pressing from which pieces of laminated veneer lumber are cut, an improved lay-up comprising placing opposite respective loose and tight faces of the veneer layers in face-to-face relation with the respective loose and tight faces of the next adjacent layer in substantially all of the layers in the lay-up, and arranging the layers symmetrically about the central core portion of the complete laid up panel.
Dependencies are inferred from the claim text.