Springer Nature is making Coronavirus research free. View research | View latest news | Sign up for updates

Thickness swelling and density variation in aspen flakeboards

  • 63 Accesses

  • 9 Citations

Summary

This paper reports the relationship between thickness swelling and density in labmade aspen flakeboards. The boards were manufactured with several levels of initial mat moisture content and urea resin content. Weight increase and thickness swelling at 12 locations on each board were recorded under specified environmental conditions over a period of 71 days. Each board was then cut into 12 specimens, each containing one of the 12 locations at its center, and density was calculated. No definite relationship was found between thickness swelling and density among the 12 specimens of each board. Our results suggest that high initial moisture content and high resin content can decrease thickness swelling. Variations in mat pressure and core temperature during the press cycle and weight increase at 80 percent relative humidity are discussed.

This is a preview of subscription content, log in to check access.

References

  1. Beech, J. C. 1975: The thickness swelling and wood particleboard. Holzforschung 29: 11–18

  2. Gatchell, C. J.; Heebink, B. G.; Hefty, F. V. 1966: Influence of component variables on properties of particleboard for exterior use. Forest Prod. J. 16(4): 46–59

  3. Halligan, A. F.; Schniewind, A. P. 1972: Effect of moisture on physical and creep properties of particleboard. Forest Prod. J. 22(4): 41–48

  4. Humphrey, P. E. 1982: Physical aspects of wood particleboard manufacture. Ph.D. thesis, Department of Forestry and Wood Science, University College of North Wales, Bangor

  5. Kass, A. J. 1969: Inelastic mechanical behavior in wood stressed perpendicular to the grain radially, Ph.D. thesis, University of Michigan, Ann Arbor, MI

  6. Kavvouras, P. K. 1977: Fundamental process variables in particleboard manufacture. Ph.D. thesis, Department of Forestry and Wood Science, University College of North Wales, Bangor

  7. Kelley, S. S.; Rials, T. G.; Glasser, W. G. 1987: Relaxation behavior of the amorphous components of wood. J. Mater. Sci. 22: 617–624

  8. Kelly, M. W. 1977: Critical literature review of relationships between processing parameters and physical properties of particleboard. Gen. Tech. Rep. FPL-GTR-10. Madison, WI: U.S. Department of Agriculture, Forest Products Laboratory

  9. Kunesh, R. H. 1961: The inelastic behavior of wood: A new concept for improved panel forming processes. Forest Prod. J. 11: 395–406

  10. Lehmann, W. F.; Hefty, F. V. 1973: Resin efficiency and dimensional stability of flakeboard. Res. Pap. FPL 207. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory

  11. Maku, T.; Hamada, R.; Sasaki, H. 1959: Studies on the particleboard (chipboard). IV. Temperature and moisture distribution in particleboard during hot pressing. Kyoto University, Wood Research 21: 34–46

  12. Stewart, H. A.; Lehmann, W. F. 1973: High-quality particleboard from cross-grain, knife-planed hardwood flakes. Forest Prod. J. 23(8): 52–60

  13. Strickler, M. D. 1959: Effect of press cycles and moisture content on properties of Douglas-fir flakeboard. Forest Prod. J. 9: 203–215

  14. Suchsland, O. 1959: An analysis of the particleboard process. Quarterly Bull. of the Michigan Agric. Exp. Stn., Michigan State University 42: 350–372

  15. Suchsland, O. 1967: Behavior of a particleboard mat during the pressing cycle. Forest Prod. J. 17(2): 51–57

  16. Suchsland, O. 1973: Hygroscopic thickness swelling and related properties of selected commercial particleboards. Forest Prod. J. 23(7): 26–30

  17. Tomimura, Y.; Matsuda, T. 1986: Particleboard made of steamed flakes. Mokuzai Gakkaishi 32:170–175

Download references

Author information

Additional information

The Forest Products Laboratory is maintained in cooperation with the University of Wisconsin. This article was written and prepared by U.S. Government employees on official time, and it is therefore in the public domain and not subject to copyright

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Liu, J.Y., McNatt, J.D. Thickness swelling and density variation in aspen flakeboards. Wood Sci.Technol. 25, 73–82 (1991). https://doi.org/10.1007/BF00195558

Download citation

Keywords

  • Urea
  • Relative Humidity
  • Material Processing
  • Core Temperature
  • Density Variation