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Knots derive from tree branches. When boards are sawn from a log, the sawblade cuts through cross sections of ingrown branches, leaving round, dark colored masses called knots (Fig. 1). Because the grain of a knot runs more or less perpendicular to the length of a board, it weakens the board, similar to how a hole at that location might weaken the board. Although multiple knots in close proximity are known to weaken lumber performance even further, lumber grading rules used to assess knot groupings in southern pine are somewhat qualitative and subjective.
Ross, Robert J.
| - FPL's Mission and Strategic Plan - |
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FPL's mission is to identify and conduct innovative wood and fiber utilization research that contributes to conservation and productivity of the forest resource, thereby sustaining forests, the economy, and quality of life. ... ..more » |
| - FPL Research Emphasis Areas - |
Advanced Composites
As an integral part of the FPL mission, we improve the long-term sustainability of our Nation's forests by creating valuable composite products from biobased materials ... ..more » 
Advanced Structures
The FPL has been in the forefront of wood-frame housing research since 1910 and has long been recognized as a world leader in such housing-related areas as engineered wood ... ..more » 
Forest Biorefinery
We all know the compelling reasons that the United States needs to reduce its dependence on fossil fuels. Historically, the greatest increases in energy demand have been for transportation fuels ... ..more » 
Nanotechnology
A leader in wood products research for over a century, the FPL is positioning itself to become the lead Federal research facility for the application of nanotechnology in forest products ... more » 
Woody Biomass Utilization
Forests in the United States contain a substantial amount of small-diameter, overstocked, and underutilized material.FPL research projects are exploring the potential of the small-diameter ... ..more » |