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    Author(s): Nadir Ayrilmis; Theodore L. LaufenbergJerrold E. Winandy
    Date: 2009
    Source: European journal of wood and wood products. Vol. 67 (2009): pages 287-295.
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (360.74 KB)

    Description

    A series of commercial phenol-formaldehyde bonded MDF panels were exposed to a post-manufacture heat-treatment at various temperatures and durations using a hot press and just enough pressure to ensure firm contact between the panel and the press platens. Physical properties and static flexural strengths of the post heat-treated MDF panels were evaluated according to ASTM D 1037 (2002). The results indicated that the post-manufacture heat-treatment of the exterior MDF panels resulted in improvement of thickness swelling. Water absorption and linear expansion properties were adversely affected by the heat-treatment. Modulus of rupture and modulus of elasticity values of the heat-treated panels decreased with increasing treatment temperature. A series of three 12-week creep tests were performed in climatic chambers conditioned at 65% RH, 90% RH, and cyclic 65–90% RH, all at a steady temperature of 20 C. The creep tests generally followed procedures as specified in ASTM D 6815-02a (2002). Creep deflections of the panels increased with increasing temperature of the post heat-treatment.

    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

    Ayrilmis, Nadir; Laufenberg, Theodore L.; Winandy, Jerrold E. 2009. Dimensional stability and creep behavior of heat-treated exterior medium density fiberboard. European Journal of Wood Products. DOI 10.1007/s00107-009-0311-7. Date accessed: February 24, 2009.

    Keywords

    Composite materials, moisture, temperature, absorption, swelling, fiberboard, creep, mechanical properties, heat treatment, deformations, testing, elasticity, modulus of elasticity, dimensional stability, moisture content, hot pressing, ASTM D 1037, ASTM D 6815-02a, MDF, physical properties, strength

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