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Influence of percent alignment and shelling ratio on linear expansion of oriented strandboard: a model investigation

W Xu

Document Type

Article

Journal/Book Title/Conference

Forest Products Journal

Volume

50

Issue

7/8

First Page

88

Last Page

93

Publication Date

2000

Abstract

Oriented strandboard (OSB) is a versatile engineered material because the orientation of the strands and the shelling ratio (a measure of weight percentage of the face layer) can be easily changed to modify its properties. This paper reports a model investigation on the influence of orientation level of the strands as measured by percent alignment (PA) and shelling ratio (SR) on linear expansion (LE) of OSB. In general, reduction of LE in one direction is achieved at the expense of LE in the other direction. There is, however, an exception. The analysis showed that if PA is equal in both the face and core layers, increasing PA decreases LE in both directions at the same time if SR is around 0.5. This paper also discusses the LE ratio (LE-Perpendicular/LE-Parallel) in relation to PA and SR. The interdependence of PA in the face, PA in the core, and SR is graphically presented for the control of LE ratio. The ramification of incorporating large amount of fines in the core of OSB, a popular practice in the industry, is also discussed.

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