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Comparative studies on the influence of gluing in the blowline and blender on the physical-mechanical properties of MDF and its dimensional stability

: Krug, D.; Roffael, E.; Dix, B.; Schneider, T.; Stephani, B.

Fraunhofer-Institut für Holzforschung, Wilhelm-Klauditz-Institut -WKI-, Braunschweig; European Panel Federation -EPF-:
4th European Wood-Based Panel Symposium 2004 : Hanover/Germany, 15 - 17 September 2004
Braunschweig, 2004
European Wood-Based Panel Symposium <4, 2004, Hannover>
Europäisches Holzwerkstoff-Symposium <4, 2004, Hannover>
Fraunhofer WKI ()
mitteldichte Faserplatte; Beleimungsverfahren; Blowline-Verfahren; Blender-Verfahren; Platteneigenschaften; medium density fiberboard (MDF); gluing; board properties

Results of a joint research work between the Institute of Wood Biology and Wood Technology of the University of Göttingen, the Fraunhofer Institute of Wood Research (WKI) and the Institute of Wood Technology Dresden (ihd) lead to the following results: MDF produced using the blender method are of higher internal bond strength and lower thickness swelling values compared to those made by the blowline technique. However, MDF made out of pine and beech wood fibres using the blowline method seem to have better dimensional stability at different climatic conditions. A direct comparison of different types of MDF made from beech and pine wood revealed that, generally, boards made from pine are dimensionally more stable. The overall results indicate that there is no clear-cut correlation between the physical-mechanical properties of the boards on the one hand and their long-term performance on the other hand.