Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): Robert L. Geimer; Jin Heon Kwon
    Date: 1999
    Source: Wood and fiber science. Vol. 31, no. 1 (Jan. 1999).:p. 15-27.
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (254 KB)


    The results of this study showed that the same relative reductions in thickness swelling (TS) previously obtained with steam-injection-pressed (SIP) resinless mats are also obtained in boards bonded with 3% isocyanate resin. Reductions in thickness swelling were proportional to steam time and pressure. Thickness swelling of 40% measured in conventionally pressed boards following a vacuum-pressure-soak treatment was reduced to 25% in a board exposed to 20 sec of steam at 600 kPa and to 6% in a board exposed to 40 sec of steam at 1,900 kPa. We believe that the reductions in thickness swelling result from a combination of flake plasticization, blignin flow,c and chemical modification. Bending properties of the SIP boards were substantially lower than that of conventionally pressed boards, which we attribute in part to the very short press times and the relatively fast decompression used to manufacture the SIP boards. Bending properties of SIP boards also suffered from a reduction of the vertical density gradient. However, this characteristic is favorable to shear properties.

    Publication Notes

    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.


    Geimer, Robert L.; Kwon, Jin Heon. 1999. Flakeboard thickness swelling. Part II, Fundamental response of board properties to steam injection pressing. Wood and fiber science. Vol. 31, no. 1 (Jan. 1999).:p. 15-27.


    Flakeboards, Swelling, Bending, Dimensional stability, Oriented strandboard

    Related Search

    XML: View XML
Show More
Show Fewer
Jump to Top of Page