Shrinkage of Outerwood, Middlewood, and Corewood of Two Sweetgum Trees
Keywords:Moisture content, shrinkage, specific gravity, sweetgum
AbstractTwo sweetgum (Liquidambar styraciflua L.) trees were used to determine the shrinkage properties of green outerwood, middlewood, and corewood. Samples were taken at various heights along the boles from each side of a disk. Shrinkage displayed the following general pattern: corewood > middlewood > outerwood. This pattern was reversed for the specific gravity of samples from each of these wood types from tree 1, but tree 2 maintained a relatively uniform specific gravity among wood types.
Choong, E. T. 1969. Moisture and the wood of the southern pines. Forest Prod. J. 19(2):30-36.nChoong, E. T., P. J. Fogg, and C. B. Pollock. 1989. Variation in shrinkage properties of second-growth baldcypress and tupelo-gum. Wood Fiber Sci. 21(1): 17-29.nHarlow, W. H., E. S. Harrar, and F. M. White. 1979. Textbook of dendrology. McGraw-Hill Book Co., New York, NY. 510 pp.nHenderson, L. G., and E. T. Choong. 1968. Variation in moisture content of standing sweetgum trees in Louisiana. LSU Wood Utilization Note No. 81. Louisiana State Univ. Agric. Exp. Sta., Baton Rouge, LA. 4 pp.nJames, W. L., E. T. Choong, D. G. Arganbright, D. K. Doucet, M. R. Gorvad, W. L. Galligan, and W. T. Simpson. 1984. Moisture levels and gradients in commercial softwood dimension lumber shortly after kiln-drying. Forest Prod. J. 34(11/12):59-64.nMaeglin, R. R., J. Y. Liu, and R. S. Boone. 1985. High-temperature drying and equalizing: Effects on stress relief in yellow-poplar lumber. Wood Fiber Sci. 17(2): 240-253.nPanshin, A. J., and C. De Zeeuw. 1980. Textbook of wood technology, 4th ed. McGraw-Hill Book Co., New York, NY. 722 pp.nSAS Institute, Inc. 1989. SAS/STAT User's guide, version 6, 4th ed., vol. 2. Cary, NC. 846 pp.nShupe, T. F., E. T. Choong, and M. D. Gibson. 1995a. Differences in moisture content and shrinkage between outerwood, middlewood, and corewood of two yellow-poplar trees. Forest Prod. J. 45(9):85-90.nShupe, T. F., E. T. Choong, and M. D. Gibson. 1995b. Differences in moisture content and shrinkage between innerwood and outerwood of cottonwood. Forest Prod. J. 45(10) (in press).nSmith, D. M. 1954. Maximum moisture content method for determining specific gravity of small wood samples. Rep. 2014. USDA Forest Serv., Forest Prod. Lab., 7 pp.nSteel, R. G. D., and J. H. Torrie. 1980. Principles and procedures of statistics: A biometrical approach, 2nd ed. McGraw-Hill Book Co., New York, NY. 633 pp.nUSDA Forest Products Laboratory. 1987. Wood handbook: Wood as an engineering material. Agric. Handbk. 72. Washington, DC. 466 pp.n
The copyright of an article published in Wood and Fiber Science is transferred to the Society of Wood Science and Technology (for U. S. Government employees: to the extent transferable), effective if and when the article is accepted for publication. This transfer grants the Society of Wood Science and Technology permission to republish all or any part of the article in any form, e.g., reprints for sale, microfiche, proceedings, etc. However, the authors reserve the following as set forth in the Copyright Law:
1. All proprietary rights other than copyright, such as patent rights.
2. The right to grant or refuse permission to third parties to republish all or part of the article or translations thereof. In the case of whole articles, such third parties must obtain Society of Wood Science and Technology written permission as well. However, the Society may grant rights with respect to Journal issues as a whole.
3. The right to use all or part of this article in future works of their own, such as lectures, press releases, reviews, text books, or reprint books.