Enhancement of low-density particleboard properties by core layer particle orientation
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Three layer particleboards of 500 and 650 kg/m3 target density were made by spreading the core layer wood particles between upright positioned caul plates with the intention of partial vertical orientation. This procedure was assumed to increase the core layer compression resistance and, thus, counteract decreased panel properties in lightweight particleboard manufacture. While internal bond strength and thickness swelling were significantly improved, bending properties were on the same level as those of the references with conventional particle orientation. Density profiles were found to be just slightly more pronounced. The lack of improvements was explained by the changed structural set-up and, thus, lacking of core layer support.
The authors thank the Fachagentur Nachwachsende Rohstoffe e.V. (FNR) (Gülzow, Germany) for its financial support. We also thank the research partner Stuttgart University, Institute of Machine Tools (IfW) (Stuttgart, Germany), especially Mr. Matthias Schneider, Mr. Dan Talpeanu and Dr.-Ing. Thomas Stehle. And also the industry partners Kronopol Sp z o.o. (Zary, Poland), especially Prof. Dr. Joachim Hasch and Mr. Maik Hirschberg; Leuco Ledermann GmbH & Co. KG (Horb am Neckar, Germany), especially Dr. Martin Dressler; and Pallmann Maschinenfabrik GmbH & Co. KG (Zweibrücken, Germany), especially Dr. Helmut Roll; for their involvement in the project. Special thanks go to all those persons who were engaged in the experimental realization and data analysis, namely Mrs. Dörte Bielenberg, Mrs. Sabrina Heldner, Mrs. Bettina Steffen, and Mr. Hannes Wagner (all Thünen Institute of Wood Research).
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