Effect of silvicultural practice and veneer grade layup on some mechanical properties of loblolly pine LVL

Loblolly pine harvested from silviculturally different stands was used to manufacture 13-ply laminated veneer lumber (LVL). For each stand, LVL was manufactured with either all A-grade or all C-grade veneer. A stand that was managed to quickly produce sawlogs (sudden sawlog) gave the highest strengt...

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Bibliographic Details
Published in:Forest products journal 1997-09, Vol.47 (9), p.63-69
Main Authors: SHUPE, T. F, HSE, C. Y, GROOM, L. H, CHOONG, E. T
Format: Article
Language:English
Subjects:
Applied sciences
Composite materials
Exact sciences and technology
Forest products industry
Manufacturing
Mechanical properties
Plywood
Polymer industry, paints, wood
Processes
Studies
Timber
Trees
Wood composites
Wood-based materials
Wood. Paper. Non wovens
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Summary:Loblolly pine harvested from silviculturally different stands was used to manufacture 13-ply laminated veneer lumber (LVL). For each stand, LVL was manufactured with either all A-grade or all C-grade veneer. A stand that was managed to quickly produce sawlogs (sudden sawlog) gave the highest strength for A-grade LVL tested in both edgewise and flatwise orientations and C-grade tested in the flatwise orientation. None of the veneer from this stand was obtained from the live crown area and, therefore, was knot-free. Stiffness values did not significantly differ among the stands. The effect of veneer grade arrangement within a panel was also investigated and significant differences were found to exist. The most favorable mechanical properties for veneer grade arrangement were obtained with a layup that placed two A-grade veneers located in the bottom two laminations (tension side) and a single A-grade veneer on the other face (compression side) and a C-grade core.
ISSN:0015-7473
2376-9637