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    Author(s): C. G. Carll
    Date: 1998
    Source: (Research note FPL ; RN-0267):10 p. : ill. ; 28 cm.
    Publication Series: Research Note (RN)
    Station: Forest Products Laboratory
    PDF: View PDF  (270 KB)

    Description

    Aspen (Populus gradidentata) and loblolly pine (Pinus taeda) flakes were prepared with tangential-grain and radial-grain faces on a laboratory disk flaker. These were gently dried in a steam-heated rotary drum dryer. Approximately 1 week after drying, surface wettability was measured on a large sample of flakes using an aqueous dye solution. Three replicate boards of each combination of flake species and face grain were then fabricated. Each of the three replicate boards was made with a different adhesive resin. The three adhesives were urea-formaldehyde, phenolic, and neat isocyanate. The procedure (wettability measurements and board fabrication) was repeated at 1 month, 6 months, and 12 months after flake preparation. Surface wettabilities were reduced as the flake surfaces aged. Tension strengths of boards perpendicular to their faces (internal bond strengths) were also reduced as flake surfaces aged, and reductions in internal bond strengths and surface wettabilities appear to be related. Bending properties were, in general, not influenced by flake age. The observed reductions in internal bond strengths suggest that laboratory storage of flakes for much longer than 6 months is not a good practice. However, no conclusive statements can be drawn from this work concerning the influence of flake aging on board properties.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Carll, C. G. 1998. Flake storage effects on properties of laboratory-made flakeboards. (Research note FPL ; RN-0267):10 p. : ill. ; 28 cm.

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    Keywords

    Flakeboards, Physical properties, Bond strength, Storage, Wood chips, Flakes, Internal bond, Wettability

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