Banner for LabNotes
From Lab Notes
Contact Information
Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53726-2398
Phone: (608) 231-9200
Fax: (608) 231-9592


You are here: FPL Home  / Information Products & Services  / Publications

Requested Product

Title: Press-drying plantation-grown loblolly pine 2 by 4's to reduce warp

Source: Forest Prod. J., Volume 38, Number 11/12, 1988; pp. 41-48.

Author(s): Simpson, William T.; Danielson, Jeanne D.; Boone, R. Sidney

Publication Year: 1988  View PDF »

Category: Journal Articles

Abstract: This study shows that crook, bow, and twist can be significantly reduced in fast-grown plantation loblolly pine 2 by 4’s by press-drying instead of kiln-drying. If lumber is presurfaced to a uniform thickness, it can be press-dried in 90 minutes or less without collapse, excessive loss of thickness, or checking. Warp was evaluated in terms of both the amount of warp in 1/32-inch increments and the percentage of pieces that would be downgraded because of warp. The results of the study indicated that presurfaced 2 by 4’s press-dried at 25 psi have less downgrade (<4%) because of warp than kiln-dried 2 by 4 controls (18% to 29% downgrade). We also compare the effects of surfacing and not surfacing specimens before press-drying, sorting by weight for press-drying, and drying 1-inch-thick 4/4 boards.

Keywords: press-drying, plantation-grown, loblolly pine, warp

Publication Review Process: Non-Refereed (Other)

File size: 1,068 kb(s)

Date posted: 03/16/2015
RITS Product ID: 72432

Additional items that might interest you
View the video celebrating FPL's 100 years of public service in 2010, from the producers of the Greatest Good....view

Research Highlights from FPL....view

Termite Eradication: A search for the Holy Grail.... view

Moisture Management in Residential Construction Series videos...view

Wood Floor Systems in Residential Construction Series videos....view
- FPL's Mission and Strategic Plan -

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 »


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 »