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): Chung-Yun Hse
    Date: 1972
    Source: Forest Products Journal, Vol. 22(9): 104-108
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (1.31 MB)

    Description

    Thirty-six resins, ach with two replicates, were factorially prepared with three forumlation variables: molar ratios of sodium hydroxide to phenol of 0.4, 0.7, and 1.0; levels of resin solids content of 37, 40, and 43 percent; and molar ratiios of formaldehyde to phenol of 1.6, 1.9, 2.2, and 2.5. Glue bond quality decreased substantially with a change of NaOH/phenol ratio from 0.4 to 0.7. A further change in ratio from 0.7 to 1.0 failed to affect it significantly, apparently because conversion of formaldehyde by the Cannizzaro reaction became important where more than half a mole of caustic was present in the reaction mixture. On the average, bond quality increased as solids content increased. Changes in CH2O/phenol ratio affected delamination but not wet shear strength or wood failure percentages; the lower molar ratios yielded gluelines that delaminated least. Latewood-to-latewood delaminated substantially more than earlywood-to-earlywood gluelines. Of 72 batches of resins, two met the woodfailure standard for exterior gluelines. Three yielded latewood-to-latewood gluelines that averaged less than 20 percent delamination in 3 months of outdoor exposure in central Louisiana.

    Publication Notes

    • You may send email to pubrequest@fs.fed.us to request a hard copy of this publication.
    • (Please specify exactly which publication you are requesting and your mailing address.)
    • 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.

    Citation

    Hse, Chung-Yun. 1972. Influence of resin formulation variables on bond quality of southern pine plywood. Forest Products Journal, Vol. 22(9): 104-108

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page
https://www.fs.usda.gov/treesearch/pubs/24157