Selected Chemical Modifications of Red Oak and Hard Maple Flakes for Flakeboard Manufacturing

Authors

  • Paul R. Blankenhorn
  • Peter Labosky, Jr.
  • Lee R. Stover
  • David Nicholls

Keywords:

Flakeboard, red oak, hard maple, chemical pretreatments

Abstract

The feasibility of using low chemical concentrations, time, and pressure for modifying red oak and hard maple flakes was investigated. Red oak and hard maple flakes were pretreated with water, sodium hydroxide, and acetic acid for different times and pressures to determine weight loss. The chemically modified flakes were processed into flakeboards. Untreated aspen, red oak, and hard maple panels were used as controls. Compared to the hard maple controls, hard maple panels had a reduction in press closing time for all treatment levels. However, a reduction in press closing time for treated red oak compared to red oak controls was evident only for very high weight loss values. Weight loss for red oak and hard maple can be controlled, and it appeared that acetic acid treatments produced better properties for both species compared to sodium hydroxide or water treatments. Mechanical properties were reduced in hard maple for all treatments and in red oak for some treatments, particularly sodium hydroxide treatments. Bending strength values for acetic acid-treated red oak panels were not significantly different from red oak control values. Water and acetic acid treatments for red oak produced similar dimensional stability values compared to red oak controls. This indicated that weight loss can be controlled without detriment to the dimensional stability of the panels. Density, internal bond, thickness swell, water absorption, and linear expansion values for red oak control and acetic acid-treated red oak panels compared favorably with aspen control panels. Density, internal bond, thickness swell, water absorption, and linear expansion values for hard maple control and linear expansion values for water and acetic acid-treated hard maple panels also compared favorably with aspen control panels.

References

American Society For Testing and Materials. 1984. Standard methods of conducting the properties of wood base fiber and particle panel materials. ASTM D 1037-75. Philadelphia, PA.nBeer, C. D. 1982. Flaking high density species for structural board. In Proceedings of the 16th International Symposium on Particleboard, Washington State Univ., Pullman, WA.nCarll, Charles. 1986. Wood particleboard and flakeboard types, grades, and uses. USDA Forest Service, Forest Products Laboratory, General Technical Report FPL-GTR-53. 8 pp.nChapman, K. M., and D. J. Jenkin. 1986. Hydrogen peroxide as a resin cure accelerator. J. Adhesion 19:137-151.nDavis, W. H., and W. S. Thompson. 1964. Influence of thermal treatments of short duration on the toughness and chemical composition of wood. Forest Prod. J. 14(8):350-356.nHse, Y. H. 1975. Properties of flakeboards from hardwoods growing on southern pine sites. Forest Prod. J. 25(3):48-53.nHunt, M. D., W. L. Hoover, D. A. Fergus, W. F. Lehmon, and J. O. McNatt. 1978. Red oak structural particleboard for industrial/commercial roof decking. Paper RB 954. Ag. Exp. Stat, Purdue University, West Lafayette, IN.nJahan-Latibari, A. 1982. The response of aspen flakes and flakeboard to flake surface modifications. Proceedings of the 16th International Symposium on Particleboard, Washington State Univ., Pullman, WA.nJohnson, E. S., ed. 1956. Wood particleboard handbook. the Industrial Experimental Program at the School of Engineering, North Carolina State College, Raleigh, NC.nKelly, N. W., and E. W. Price. 1985. Effect of species and panel density on durability of structural flakeboard. Forest Prod. J. 35(2):39-44.nKoch, P. 1972. Utilization of the southern pines. Vol. 1. USDA Agri. Handbk. 420(2):605-625.nLarmore, F. D. 1959. Influence of specific gravity and resin content on properties of particleboard. Forest Prod. J. 9(4):131-134.nMaclean, J. D. 1951. Rate of disintegration of wood under different heating conditions. American Wood Preservers Association Proceedings 47:155-169.nMaclean, J. D. 1953. Effects of steaming on the strength of wood. American Wood Preservers Association Proceedings 49:88-112.nMaloney, T. M. 1977. Modern particleboard and dry-processing fiberboard manufacturing. Miller Freeman Publishers. 672 pp.nMoslemi, A. A. 1974. Particleboard, vol. 2. Southern Illinois University Press. 244 pp.nPrice, E. W. 1976. Determining tensile properties of sweetgum veneer flakes. Forest Prod. J. 26(10): 50-53.nPrice, E. W., and C. Y. Hse. 1983. Bottomland hardwoods for structural flakeboards. Forest Prod. J. 33 (11/12):33-40.nRoffael, E., and W. Rauch. 1974. Extractives of oak and their influence on the gluing with alkaline phenol-formaldehyde resins. Holz Roh-Werkst. 32:182-187.nRowell, R. M., R. H. S. Wang, and J. A. Hyatt. 1986. Flakeboards made from aspen and southern pine wood flakes reacted with gaseous ketene. J. Wood Chem. Tech. 6(3):449-471.nSpringate, N. C. 1980. The use of different species in the production of waferboard. In Canadian Waferboard Symposium. Forintek Canada Corp., Canada.nZavarin, E. 1984. Activation of wood surface and non-conventional bonding. In R. M. Rowell, ed. The chemistry of solid wood, A.C.S. Advances in Chemistry Series No. 207, American Chemical Society, Washington, DC.n

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Published

2007-06-22

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Research Contributions