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Accessible Unlicensed Requires Authentication Published by De Gruyter July 25, 2011

Properties of thermally modified medium-density fibreboards

Jürgen Bonigut, Detlef Krug and Beate Stephani
From the journal

Abstract

Thermal treatment of solid timber and oriented strandboards (OSB) improves durability against fungal decay and dimensional stability (swelling and shrinking). It is not clear whether thermal treatment of medium-density fibreboards (MDF) has the same effects. In this work, four variants of phenol-formaldehyde (PF)-bonded MDF with varying contents of resin and hydrophobing agent were thermally post-treated according to the Mühlböck procedure at three different maxi-mum temperatures. The short-term properties internal bond, modulus of rupture, modulus of elasticity, thickness swelling and equilibrium moisture content and the long-term property creep behaviour of treated variants and of one untreated variant have been tested. The results are presented and discussed in comparison with the respective European standards. Altogether, the thermal treatment had a positive effect on most of the tested mechanical short-term properties. The moisture-related properties, i.e., thickness swelling and equilibrium moisture content, were also positively influenced. The creep behaviour of heat-treated MDF could also be improved by thermal modification.


Corresponding author. Institute of Wood Technology Dresden gemeinnuetzige GmbH, Zellescher Weg 24, 01217 Dresden, Germany Phone: +49 351 4662-278 Fax: +49 351 4662-211

Received: 2010-11-18
Accepted: 2011-6-21
Published Online: 2011-07-25
Published in Print: 2012-01-01

©2012 by Walter de Gruyter Berlin Boston