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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

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