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Proceedings Paper

Dynamics of mat consolidation during pressing: what we've learned with our in-press radiation system for pressing wood composites
Author(s): Paul M. Winistorfer; William W. Moschler
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Paper Abstract

We have designed a radiation-based system for density measurement of wood composites during pressing. During pressing, heat and mass transfer, consolidation speed and mat characteristics interact to produce a density distribution in the mat that is typified by high surface density and low core density. Measuring density of the wood mat during consolidation is a key parameter for understanding subsequent product performance. The system provides for density measurement at three horizontal planes in the wood mat, at positions of 25 percent, 50 percent, and 75 percent of the mat thickness at any time during the press cycle. The system incorporates three cesium sources and electronic detection equipment, collimated to move in concert with the up-acting press platen. Radiation count data taken at eight counts per second is converted to density. Press position and time are simultaneously recorded with the count data. Experimentation with the system has included radiation measurements in aspen and pine wood mats, incorporating different rates of press closure and furnish moisture content; both variables known to influence formation of the density distribution in the mat. Results are presented that depict density changes in the mat during pressing.

Paper Details

Date Published: 15 November 1996
PDF: 11 pages
Proc. SPIE 2944, Nondestructive Evaluation of Materials and Composites, (15 November 1996); doi: 10.1117/12.259073
Show Author Affiliations
Paul M. Winistorfer, Tennessee Forest Products Ctr. and Univ. of Tennessee (United States)
William W. Moschler, Tennessee Forest Products Ctr. and Univ. of Tennessee (United States)

Published in SPIE Proceedings Vol. 2944:
Nondestructive Evaluation of Materials and Composites
Steven R. Doctor; Carol A. Nove; George Y. Baaklini, Editor(s)

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