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Forests 2013, 4(2), 270-278; doi:10.3390/f4020270

Effect of Nondestructive Evaluation of Veneers on the Properties of Laminated Veneer Lumber (LVL) from a Tropical Species

1,* , 1
Jr. 3
1 Department of Forest Engineering, Faculty of Technology, University of Brasília, P.O. Box 04357, 70904-970, Brasília, DF, Brazil 2 Forest Products Laboratory, Brazilian Forest Service, Ministry of Environment, 70818-900, Brasília, DF, Brazil 3 Department of Forest Science, Luiz de Queiroz College of Agriculture, University of São Paulo, 13418-900, Piracicaba, SP, Brazil
* Author to whom correspondence should be addressed.
Received: 28 January 2013 / Revised: 21 April 2013 / Accepted: 24 April 2013 / Published: 29 April 2013
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This study aimed at evaluating the potential of Schizolobium parahyba to produce laminated veneer lumber (LVL) and the feasibility of a nondestructive method for grading the veneers. Initially, 64 S. parahyba veneers were nondestructively tested using the stress wave method, and stress wave velocity (wv) and veneer dynamic modulus of elasticity (EdV) were determined. Afterwards, the veneers were graded according to EdV descending values and used to manufacture 8-ply LVL boards. After the manufacturing, the boards were also nondestructively tested, and the board dynamic modulus of elasticity (EdB) was determined. Simple linear regression analysis was run to evaluate the relationship between the nondestructive and mechanical properties of veneers/boards. A positive effect of veneer stress wave properties on the LVL properties was found. Therefore, the higher the EdV values, the higher the LVL properties. The relationships between EdV and EdB properties were highly significant with all mechanical properties. It was clearly observed that when this grading procedure was used, the veneers were indirectly graded by their density. Finally, it could be concluded that S. parahyba showed good potential to produce LVL.
Keywords: stress wave evaluation; tropical wood veneer; veneer grading stress wave evaluation; tropical wood veneer; veneer grading
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Del Menezzi, C.; Mendes, L.; de Souza, M.; Bortoletto, G., Jr. Effect of Nondestructive Evaluation of Veneers on the Properties of Laminated Veneer Lumber (LVL) from a Tropical Species. Forests 2013, 4, 270-278.

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