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Title: Effect of Heating wet wood on its subsequent dimensions

Source: American Wood-Preservers' Association

Author(s): Koehler, Arthur

Publication Year: 1933  View PDF »

Category: Conference Proceedings

Abstract: In kiln drying, permanent bending, preservative, and other preparatory processes, wood is frequently heated while wet to temperatures close to and even considerably above the boiling point of water. Under such conditions the wood sometimes checks and undergoes distortion of shape. Mechanical tests have shown that steaming green wood at temperatures above 212° F. may considerably reduce its strength below that of similar unsteamed wood. Much of this loss in strength, however, is regained as the wood dries. With loblolly pine, at least, it was found that on resoaking the previously steamed and dried wood it again was lower in strength than unsteamed green wood, showing thereby that the weakening effect was permanent in the wet wood. This condition was ascribed by Hatt2 to a permanently raised fiber-saturation point which allowed the cell walls to imbibe more water in the presence of a sufficient amount of moisture than is normally present in the cell walls of green wood, thereby reducing its strength.

Keywords: Heating, steaming, wetting, wood properties, wood strength

Publication Review Process: Non-Refereed (Other)

File size: 344 kb(s)

Date posted: 09/12/2012
RITS Product ID: 61271

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