Abstract
The effects of panel density and strand size on the temperature and gas pressure inside strand mats during hot pressing has been experimentally investigated. The results show good agreement with model predictions. Strand dimensions have a strong effect on the core temperature and gas pressure when the mat/panel density is relatively high. At lower density, the temperature and gas pressure are controlled only by the panel density. Comparison between the model predictions and experimental results also reveals the need for further characterisation of the basic mat properties, especially conductivity and permeability.
References
Alexopoulos, J. (1999) Troubleshooting and baselining a manufacturing temperature and gas pressure: Part 1. OSB manufacturing. In: Proceedings of the 33rd International Particleboard Composite Materials Symposium, Washington State University.Search in Google Scholar
Chen, S. (2000) Effect of fines on selected OSB properties. Alberta Research Council, Canada.Search in Google Scholar
Dai, C., Yu, C. (2004) Heat and mass transfer in wood composite panels during hot pressing: Part I. A physical-mathematical model. Wood Fiber Sci.36:585–597.Search in Google Scholar
Dai, C., Yu, C., Zhou, X. (2005) Heat and mass transfer in wood composite panels during hot pressing: Part II. Modeling void formation and mat permeability. Wood Fiber Sci.37:242–257.Search in Google Scholar
Garcia, J., Avramidis, S., Lam, F. (2000) Flake-alignment effects on temperature and gas pressure development during OSB hot pressing. In: Proceedings of the 34th International Particleboard/Composite Materials Symposium, Washington State University.Search in Google Scholar
Hata, T. (1993) Heat flow in particle mat and properties of particleboard under steam-injection pressing. Wood Res.80:1–47.Search in Google Scholar
Hood, J.P., Kamke, F.A., Fuller, J. (2005) Permeability of oriented strand board mats. For. Prod. J.55:194–199.Search in Google Scholar
Humphrey P.E., Bolton, A.J. (1989) The hot pressing of dry-formed wood-based composites. Part II. A simulation model for heat and moisture transfer and typical results. Holzforschung43:199–206.Search in Google Scholar
Kamke, F.A, Casey, L.J. (1988a) Gas pressure and temperature in the mat during flakeboard manufacture. Forest Prod. J.38:41–43.Search in Google Scholar
Kamke, F.A., Casey, L.J. (1988b) Fundamentals of flakeboard manufacture: Internal-mat conditions. Forest Prod. J.38:38–44.Search in Google Scholar
Kamke, F.A., Zylkowski, S.C. (1989) Effect of wood-based panel characteristics on thermal conductivity. Forest Prod. J.39:19–24.Search in Google Scholar
Kelly, M. (1977) Critical review of relationships between processing parameters and physical properties of particleboard. General Technical Report FPL-10. US Forest Products Laboratory, Madison, WI.Search in Google Scholar
Maku, T., Hamada, R., Sasaki, H. (1958) Studies on the particle board: Report 4. Temperature and moisture distribution in particle board during hot pressing. Wood Res.21:34–46.Search in Google Scholar
Pichelin, F., Pizzi, A., Fruhwald, A., Triboulot P. (2001) Exterior OSB preparation technology at high moisture content: Part 1. Transfer mechanisms and pressing parameters. Holz Roh Werkst.59:256–265.10.1007/s001070100219Search in Google Scholar
Siau, J.F. (1995) Wood: Influence of moisture on physical properties. Department of Wood Science and Forest Products, Virginia Polytechnic Institute and State University. Springer-Verlag, New York, NY.Search in Google Scholar
Strickler, M.D. (1959) Effect of press cycles and moisture content on properties of Douglas-fir flakeboard. Forest Prod. J.9:203–215.Search in Google Scholar
von Hass, G. (1998) Investigation of the hot pressing of wood-composite-mats under special consideration of the compression behavior, the permeability, the temperature-conductivity and sorption-speed. Hamburg, Germany. pp. 127–146.Search in Google Scholar
Wang, S., Winistorfer, P.M. (2000) Fundamentals of vertical density profile formation in wood composites. Part 2. Methodology of vertical density formation under dynamic conditions. Wood Fiber Sci.32:220–238.Search in Google Scholar
Yu, C., Dai, C., Wang, B. (2006) Heat and mass transfer in wood composite panels during hot pressing: Part III. Predicted variations and interactions of the pressing variables. Holzforschung, in press.10.1515/HF.2007.012Search in Google Scholar
Zombori, B.G., Kamke, F.A. Watson, L.T. (2004) Sensitivity analysis of internal mat environment during the hot-pressing process. Wood Fiber Sci.36:195–209.Search in Google Scholar
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