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: Stresses in wood during Drying

Source: USDA Forest Service, Forest Products Laboratory, Report No. 1652; Revised December 1958; 53 p.

Author(s): McMillen, J. M.

Publication Year: 1958  View PDF »

Category: FPL Reports (Historical)

Abstract: During drying, wood is subjected to highly complicated internal stresses. They come about because the outside of a piece of green wood dries below the fiber saturation point and tries to shrink before the interior is ready for shrinkage. They are greatly influenced by the temperature and relative humidity of the air in which the wood is dried. An understanding of these stresses is essential to kiln operators and others who set out to develop drying procedures, because the stresses can be used to advantage and unfavorable effects avoided. Initial drying conditions can be set up that will avoid surface and end checks, retain maximum dimension,m and minimize warping. Intermediate and final kiln conditions can be modified to speed drying wothout fear of internal defects. Final conditioning treatments can be used when necessary to relieve residual stresses at the end of kiln drying, thus avoiding distortion when material is resawed or machined to a nonsymmetrical pattern.

Keywords: Drying; wood defects; kilns; stresses; case hardening

Publication Review Process: Non-Refereed (Other)

File size: 1,573 kb(s)

Date posted: 07/08/2013
RITS Product ID: 64416

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 »