Summary
Brief presteaming of green, increment-core segments of mountain ash (E. regnans F. Muell) produced small but significant changes in a number of moisture-shrinkage parameters. Both total volumetric shrinkage and recoverable collapse were significantly greater in presteamed samples, the increase in collapse being largely attributable to an increase in moisture content after reconditioning (Mr). The change in shrinkage after reconditioning also was significantly related to changes in Mr. The change in Mr was interpreted as reflecting altered permeability in presteamed material and was shown to be negatively related to estimated residual collapse. Initial moisture content and per cent saturation showed a highly significant decrease after presteaming, while green volume showed a small but significant increase. Neither the estimated intersection point, unit shrinkage nor the R-ratio were significantly different after presteaming. However, the unit shrinkage-specific gravity relationship was changed by presteaming such that it more closely complied with Stamm's approximation.
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References
Barnes, H. M. 1986: Treatment of peeler cores with water dispersible preservative formulations. Wood Fiber Sci. 18: 397–412
Brown, H. P.; Panshin, A. J.; Forsaith, C. C. 1952: Textbook of wood technology. Vol. II. New York: McGraw-Hill
Campbell, G. S. 1961: The value of presteaming for drying some collapse susceptible eucalypts. For. Prod. J. 9: 343–347
Chafe, S. C. 1986a: Collapse, volumetric shrinkage, specific gravity and extractives in Eucalyptus and other species. Part 1: The shrinkage/specific gravity ratio. Wood Sci. Technol. 20: 293–307
Chafe, S. C. 1986b: Radial variation of collapse, volumetric shrinkage, moisture content and density in Eucalyptus regnans F. Muell. Wood Sci. Technol. 20: 253–262
Chafe, S. C. 1987: Collapse, volumetric shrinkage, specific gravity and extractives in Eucalyptus and other species. Part 2: The influence of extractives. Wood Sci. Technol. 21: 27–41
Chen, P. Y. S. 1975: The effect of steaming time and temperature on the longitudinal permeability of black walnut. Wood Fiber 7: 222–225
Chen, P. Y. S.; Workman, E. C. Jr. 1980: Effect of steaming on some physical and chemical properties of black walnut heartwood. Wood Fiber 11: 218–227
Cutter, B. E.; Phelps, J. E. 1986: High-pressure steam drying: Effects on permeability. For Prod. J. 36:19–20
Donaldson, L. A.; Wong, K. K. Y.; Mackie, K. L. 1988: Ultrastructure of steam exploded wood. Wood Sci. Technol. 22: 103–114
Ellwood, E. L.; Erickson, R. W 1962: Effect of presteaming on seasoning stain and drying rate in redwood. For. Prod. J. 12: 328–332
Greenhill, W L. 1938: Collapse and its removal: Some recent investigations with Eucalyptus regnans. CSIRO Aust. Div. For. Prod. Tech. Pap. 24: 1–32
Grzeczyński, T. 1962: Einfluß der Erwärmung im Wasser auf vorübergehende und bleibende Formänderungen frischen Rotbuchenholzes. Holz Roh-Werkstoff 20: 210–216
Haslett, A. N.; Kininmonth J. A. 1986: Pretreatments to hasten the drying of Nothofagus fusca. NZ J. For. Sci. 16: 237–246
Kauman, W. G. 1961: Effect of thermal degradation on shrinkage and collapse of wood from 3 Australian species. For. Prod. J. 11: 445–452
Kelsey, K. E. 1956: The shrinkage intersection point — Its significance and the method of its determination. For. Prod. J. 6: 411–417
Kininmonth, J. A. 1971: Effect of steaming on the fine structure of Nothofagus fusca. NZ J. For. Sci. 1: 129–139
Kubinsky, E. 1971: Influence of steaming on the properties of Quercus rubra L. Wood. Holzforschung 25: 78–83
Lee, H. W.; Jung, H. S. 1985: Effect of presteaming on the drying rate and drying effects of Quercus acutissima. Mogjae-gonghak 13: 3–13
Liang, S. Z. 1981: The variability of swelling and shrinkage of vermillion wood and the technique of high-temperature drying. J. Nanjing Technol. Coll. For. Prod. 1: 1–15
MacKay, J. F. G. 1971: Influence of steaming on water vapour diffusion in hardwoods. WoodSci. 3: 156–160
McGinnes, E. A. Jr.; Rosen, H. N. 1984: Macroscopic and microscopic analyses of color changes of wood pressure steam-dried above atmospheric pressure. Wood Fiber Sci. 16: 48–56
Perkitny, T.; Lawniczak, M.; Marciniak, H. 1959: Über den Einfluß des Dämpfens auf den Quellungsdruck des Holzes. Holz Roh-Werkstoff 17: 54–61
Rosen, H. N.; Laurie, S. E. 1983: Mechanical properties of conventionally kiln-dried and pressure steam dried yellow-poplar and red oak. For. Prod. J. 33: 50–52
Salud, E. C. 1976: Comparison of the quality and composition of the wood extractives of unsteamed and steamed apitong Dipterocarpus grandiflorus Blanco Pterocarpus 2: 123–134
Shimizu, K.; Sudo, K.; Nagasawa, S.; Ishihara, M. 1983: Enzymatic hydrolysis of wood. VII. Enzymatic suspectibility of autohydrolysed woods. J. Jap. Wood. Res. Soc. 29: 428–437
Simpson, W. T. 1975: Effect of steaming on the drying rate of several species of wood. Wood Sci. 7: 247–255
So, W. T. 1985: Effects of boiling, steaming and chemical treatment on solid wood bending of Quercus acutissima and Pinus densiflora. Mogjae-gonghak 13: 19–62
Stamm, A. J. 1964: Wood and cellulose science. New York: Ronald Press
Stubenvoll, A. 1985: Effect of steaming on the bending modulus of elasticity and bending strength of beech and robinia. Fairpar 35: 264–271
Tiemann, H. D. 1915: Principles of kiln drying. Lumber World Rev. Jan. 15 and Sept. 25
Tiemann, H. D. 1929: How to restore collapsed timber. The Lumber Worker 5: 37–44
Weik, B. B.; Wengert, E. M.; Schroeder, J.; Brisbin, R. 1984: Practical drying techniques for yellow-poplar S-D-R flitches. For. Prod. J. 34: 39–44
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The author expresses his appreciation to Dr. Alan Miller for assistance with statistical analysis and to Mr. Chris McEvoy for technical assistance
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Chafe, S.C. Effect of brief presteaming on shrinkage, collapse and other wood-water relationships in Eucalyptus regnans F. Muell. Wood Sci.Technol. 24, 311–326 (1990). https://doi.org/10.1007/BF00227052
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DOI: https://doi.org/10.1007/BF00227052