Paul M. Winistorfer

Fitting an equation to vertical density profile data using Fourier analysis

This paper describes the application of the Fourier analysis to fit a mathematical expression to the vertical density profile data of flakeboard. This was achieved first by performing the Fourier transform of the density profile data, and then by synthesizing the mathematical equation in the form of cosines based on the transform output. Two sets of density profile data were used in this analysis, and a good fit of the vertical density profile was obtained for each case.ZusammenfassungMit Hilfe der Fourier-Analyse wurde ein mathematischer Ausdruck gefunden, der es erlaubt, Dichteprofile von Spanplatten zu beschreiben. Zunächst wurden experimentelle Daten mittels FT-Analyse untersucht. Daraus ergab sich eine Cosinus-Funktion der Dichte-Variablen, die eine gute Anpassung an experimentelle Daten liefert.

Dynamics of mat consolidation during pressing: what we've learned with our in-press radiation system for pressing wood composites

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.

Effects of Molar Ratio of Formaldehyde to Phenol on Bonding Flakeboards with Copolymer Resins of Peanut Hull Extracts, Phenol, and Formaldehyde

Effects of Molar Ratio of Formaldehyde to Phenol on Bonding Flakeboards with Copolymer Resins of Peanut Hull Extracts, Phenol, and Formaldehyde By Chia M. Chen and Paul M. Winistorfer 2 School of Forest Resources, the University of Georgia, Athens, Georgia 30602, U.S.A. 3 Current address is Department of Forestry, Wildlife, and Fisheries, University of Tennessee, Knoxville, Tennessee 37901, U.S.A.