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Forest Products Laboratory
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Madison, WI 53726-2398
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Title: Excessive Kiln Temperatures Cost Heavily in Degrade

Source: Southern Lumberman, Nashville, Tenn., issue of April 15, 1932.

Author(s): Loughborough, W.K.; Greenhill, W.L.; Langlands, Ian

Publication Year: 1932  View PDF »

Category: Not Classified

Abstract: The operator who maintains too high a temperature in the kiln, especially when any portion of an individual board is above 25 per cent moisture content, will lose more money through degrade of stock than he will save through reduction of drying time. Although the Forest Products Laboratory has known this fact for years and all along has had plenty of evidence to substantiate it, recent research has added one more bit of confirmation. This research dealt pri-marily with a strength property, tension perpendicular to the grain, that ordinarily is overlooked. The results of this and of earlier work show that the strength of wood perpendicular to the grain varies with temperature, as well as with moisture con-tent, and that certain drying stresses at high temperatures frequently cause severe checking. Consequently the stresses re-sulting from excessive drying temperatures are too destructive to be tolerated in commercial practice, and for this reason the temperatures that cause them are not justified.

Keywords: kiln temperatures, cost, wood, stress

Publication Review Process: Non-Refereed (Other)

File size: 93 kb(s)

Date posted: 09/12/2012
RITS Product ID: 61270

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