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Holz als Roh- und Werkstoff

, Volume 64, Issue 3, pp 221–226 | Cite as

UF resin efficiency of MDF as affected by resin content loss, coverage level and pre-cure

  • Cheng XingEmail author
  • James Deng
  • S.Y. Zhang
  • Bernard Riedl
  • Alain Cloutier
ORIGINALARBEITEN ORIGINALS

Abstract

A full-factorial experimental design was used to investigate the effects of three factors on UF resin efficiency. Within the limits of this study, the three factors, namely, resin content loss, resin coverage level and resin pre-cure time for mechanical blended MDF fibres were found to have significant effects on resin efficiency as evaluated by the internal bond strength (IB) of the panels. The most significant factor was resin content loss followed by resin coverage level and resin pre-cure. The resin coverage level had a positive effect on resin efficiency, while the resin content loss, resin pre-cure time at 40 °C conditions, the interactions of resin coverage level and resin content loss as well as resin coverage level with pre-cure had negative effects on resin efficiency. For a given resin content, the resin efficiency could be increased by 35% by increasing the level of resin coverage. The resin efficiency obviously decreased with resin content loss and pre-cure time.

Keywords

Internal Bond Resin Content Urea Formaldehyde Resin Internal Bond Strength Medium Density Fibreboard 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Beeinflussung der UF-Harzwirksamkeit bei MDF durch Harzverlust, Harzverteilungsgrad und Harzvorhärtung

Zusammenfassung

In einem vollständig faktoriell angelegten Versuch wurde die Wirkung der drei Faktoren Harzverlust, Harzverteilungsgrad und Harzvorhärtung auf die UF-Harzwirksamkeit untersucht. Im Rahmen dieser Studie zeigte sich anhand der Bewertung der Querzugfestigkeit (IB) der Platten, dass sich diese drei Faktoren erheblich auf die Harzwirksamkeit bei mechanisch durchmischten MDF-Fasern auswirken. Der bedeutendste Faktor war Harzverlust gefolgt von Harzverteilungsgrad und Harzvorhärtung. Der Harzverteilungsgrad wirkte sich auf die Harzwirksamkeit positiv aus. Dagegen wirkten sich Harzverlust, Harzvorhärtungszeit bei einer Temperatur von 40 °C, sowie die gemischten Glieder aus Harzverteilungsgrad und Harzverlust sowie aus Harzverteilungsgrad und Vorhärtung negativ auf die Harzwirksamkeit aus. Durch eine verbesserte Harzverteilung konnte die Harzwirksamkeit bei gegebenem Harzgehalt um 35% erhöht werden. Die Harzwirksamkeit nimmt offensichtlich mit zunehmendem Harzverlust und Vorhärtungszeit ab.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Cheng Xing
    • 1
    Email author
  • James Deng
    • 1
  • S.Y. Zhang
    • 1
  • Bernard Riedl
    • 2
  • Alain Cloutier
    • 2
  1. 1.Forintek Canada Corp.QuébecCanada
  2. 2.département des Sciences du Bois, Faculté de foresterie et de géomatique, CERSIMUniversité LavalQuebecCanada

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