Through-Thickness Ultrasonic Transmission Properties of Oriented Strandboard
Ronnie Y. Vun and Qinglin Wu Louisiana Forest Products Laboratory School of Forestry, Wildlife, and Fisheries Louisiana State University Agricultural Center Baton Rouge, LA 70803, USA
ABSTRACT
Voids are inherent in the manufacturing of structural oriented strandboard (OSB) due to imperfection of processing and intrinsic material parameters. The presence of voids in OSB reduces its elastic moduli and influences its moisture resistance (i.e., dimensional stability). Thus, quality improvement of OSB relies largely on reduction of the amount of in-bedded void. Since voids are strong scatter of elastic wave, an attempt is made in this study to correlate ultrasonic transmission properties to internal void structure and bond strength of OSB. Through-thickness transmission speed and attenuation of commercial and laboratory-made OSB samples were measured with a contact and a non-contact ultrasonic system. Good correlations have been established among measured ultrasonic properties, bond strength, density, and other panel processing variables. This study demonstrates the potential of an ultrasonic-based system for on-line quality monitoring in OSB production.
Publication Source: Proceedings of the 12th International Symposium on Nondestructive Testing of Wood University of Western Hungary, Sopron, 13-15 September 2000, ISBN 963 7180 88 5 Publisher: University of Western Hungary, H 9400 Sopron, P.O.Box 132, FAX: +36 99 311 103
