Lathe check formation and their impact on evaluations of veneer-based panel bond quality

Anti Rohumaa, Christopher G. Hunt, Mark Hughes, Charles R. Frihart, Jaan Kers

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

    Abstract

    During the peeling of veneer, lathe checks as deep as 70 to 80% of the veneer thickness are formed. This study showed that during adhesive testing according to EN 314 deep lathe checks in birch (Betula pendula Roth) veneer significantly reduced the shear strength of phenol-formaldehyde (PF) bonded plywood, even though these checks are not mentioned in the standard. In addition, we show that specimens tested open can fail by a different mechanism than those pulled closed, especially when checks are deep. Lathe checks were also shown to influence bond strengths when using the Automated Bonding Evaluation System (ABES). These findings stress the importance of measuring lathe check depth and considering the orientations of checks during testing to get a better understanding of bond quality in veneer-based products.

    Original languageEnglish
    Title of host publicationWCTE 2016 - World Conference on Timber Engineering
    PublisherVienna University of Technology
    Number of pages8
    ISBN (Electronic)9783903039001
    Publication statusPublished - 2016
    MoE publication typeA4 Article in a conference publication
    EventWorld Conference on Timber Engineering - Vienna, Austria
    Duration: 22 Aug 201625 Aug 2016
    Conference number: 14
    http://wcte2016.conf.tuwien.ac.at/home/

    Conference

    ConferenceWorld Conference on Timber Engineering
    Abbreviated titleWCTE
    CountryAustria
    CityVienna
    Period22/08/201625/08/2016
    Internet address

    Keywords

    • Bond quality
    • Lathe checks
    • Percent wood failure
    • Plywood
    • Shear strength

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