Forest Products Laboratory

Title: Dimensional stability and creep behavior of heat-treated exterior medium density fiberboard

Author: Ayrilmis, Nadir; Laufenberg, Theodore L.; Winandy, Jerrold E.

Date: 2009

Source: European journal of wood and wood products. Vol. 67 (2009): pages 287-295.

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.

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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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 and wood products. Vol. 67 (2009): pages 287-295..