Internal Pressure Measurement Techniques and Pressure Response in Wood During Treating Processes


  • Philip F. Schneider
  • Keith L. Levien
  • Jeffrey J. Morrell


Douglas-fir, ponderosa pine, permeability, pressure treatment, pressure development


The development of pressure inside wood during preservative impregnation was studied using Douglas-fir heartwood and ponderosa pine sapwood. Pressure sensors mounted on sample holders provided the most reliable measurements. As expected, pressure equilibrated most rapidly with air as the treatment medium and ponderosa pine as the test species. Pressure changes were relatively slow in Douglas-fir heartwood, suggesting that process conditions involving relatively rapid changes in pressure conditions will have little effect on fluid penetration away from the wood surface.


Arganbright, D. G., and H. Resch. 1970. Application of electrical transducers to research in wood preservation. Forest Prod. J.20(6):23-26.nBarnes, M. H. 1988. A review of treatment cycles and application methods in wood preservation. Pages 35-41 in Margaret Hamel, ed. Wood protection techniques and the use of treated wood in construction. Proc. 47358; October 28-30, 1987. Forest Products Society, Madison, WI.nBergman, O. 1991. Temperature and pressure inside wood during creosote impregnation. The International Research Group on Wood Preservation. Document No. IRG/WP/91-3649. Stockholm, Sweden.nChoong, E. T., P. J. Foog, and F. O. Tesoro. 1972. Relationship of fluid flow to treatability of wood with creosote and copper sulfate. Proc. Am. Wood-Preserv. Assoc.68:235-249.nCobham, P., and P. Vinden. 1995. Internal pressure monitoring during the treatment of Pinus radiata (D. Don.). The International Research Group on Wood Preservation. Document No. IRG/WP/95-40049. Stockholm, Sweden.nComstock, G. L., and W. A. Côté. 1968. Factors affecting permeability and pit aspiration in coniferous sapwood. Wood Sci. Technol.2:279-291.nCooper, P. A., G. Bramhall, and N. A. Ross. 1974. Estimating preservative treatability of wood from its air-flow properties. Forest Prod. J.24(9):99-103.nFlynn, K. A., and B. S. Goodell. 1994. Efficacy of pressure treating northern red spruce with CCA using the pulsation process. Forest Prod. J.44(10):47-49.nFlynn, K. A., and B. S. Goodell. 1996. Physical effects of the pulsation preservative treatment process on northeastern red spruce (Picea rubens Sarg.) Forest Prod. J.46(1):56-62.nHudson, M. S., and S. T. Henriksson. 1956. The oscillating pressure method of wood impregnation. Forest Prod. J.6(10):381-386.nHunt, G., and G. Garratt. 1967. Wood preservation. McGraw Hill, New York, NY.nKelso, W. C., R. O. Gertjejansen, and R. L. Hossfield. 1963. The effects of air blockage upon the permeability of wood to liquids. University of Minnesota Agricultural Experiment Station, Tech. Bull. 242. St. Paul, MN. 40 pp.nKoran, Z. 1964. Air permeability and creosote retention of Douglas-fir. Forest Prod. J.14(4):159-166.nKyte, C. T., and L. D. A. Saunders. 1978. Recent developments in the treatment of sawn spruce by double vacuum impregnation. Records of the Annual Convention of the British Wood Preserv. Assoc., Paper 6, 41-47. Cambridge, UK.nOrfila, C., and J. P. Hösli. 1985. Pressure development in low permeable woods during the intrusion of air. Proc. Am. Wood-Preserv. Assoc.81:111-124.nPeek, R., and S. T. Goetsch. 1990. Dynamics of pressure change in wood during impregnation. The International Research Group on Wood Preservation. Document No. IRG/WP/90-3615. Stockholm, Sweden.nRosen, H. N. 1975. High pressure penetration of dry hardwoods. Wood Sci.8(1):355-363.nSchneider, P. F. 1999. Pressure measurement in wood as a method to understand pressure impregnation processes. Bethell, Ruping, Lowry and supercritical carbon dioxide. Ph.D. Dissertation, Oregon State University, Corvallis, OR. 243 pp.nSiau, J. F. 1970. Pressure impregnation of refractory woods. Wood Sci.3(1):1-6.nSiau, J. F. 1984. Transport processses in wood. Springer-Verlag, New York, NY, 245 pp.nSiau, J. F., and J. S. Shaw. 1971. The treatability of refractory softwoods. Wood and Fiber3(1):1-12.nWalters, C. S. 1967. The effect of treating pressure on the mechanical properties of wood: I. Red gum. Proc., Am. Wood-Preserv. Assoc.63:166-178.nWalters, C. S., and J. A. Whittington. 1970. The effect of treating pressure on preservative absorption and on the mechanical properties of Wood. II: Douglas-fir. Proc., Am. Wood-Preserv. Assoc.66:179-193.n






Research Contributions