Abstract
Barks available in commercial quantities in Australia and overseas have been examined for their efficacy as raw materials for conversion to high quality adhesives for reconstituted wood products. Previously bark from maturePinus radiata was found to be suitable. This paper examines the suitability of barks from four mature pine species (Pinus caribaea, Pinus elliottii, Pinus pinaster andPinus sylvestris), one young pine species (Pinus radiata) and one spruce species (Picea abies). Only the bark extracts ofPinus caribaea andPinus pinaster gave high quality (Type A bond, WBP) wood adhesives. The gluing properties of the adhesives derived from the extracts appeared to be dependent on their contents of formaldehyde-reactive polyflavanoids as indicated by their Stiasny values, with a value of 65% being the minimum for producing a high quality adhesive by the methods used.
Zusammenfassung
Rinden, die in Australien und Übersee im Handel sind, wurden überprüft hinsichtlich ihrer Eignung zur Umwandlung in hochwertige Leime für Holzwerkstoffe. Vor allem die Rinde vonPinus radiata erwies sich in früheren Untersuchungen als geeignet. In dieser Arbeit werden auch Untersuchungen an Rinden anderer Baumarten vorgestellt, und zwar:Pinus caribaea, Pinus elliottii, Pinus pinaster, Pinus sylvestris, jungePinus radiata undPicea abies species. Nur aus Rinden vonPinus caribaea undPinus pinaster konnten hochwertige Kleber hergestellt werden (Typ A-Bindung, WBP). Die Kleber-Eigenschaften scheinen vom jeweiligen Gehalt an Polyflavanoiden abzuhängen, die mit Formaldehyd reagieren können, wie die Stiasny-Zahlen anzeigen. Ein Wert von 65% war für die hier angewandten Methoden das Minimum zur Herstellung eines hochwertigen Klebers.
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Yazaki, Y., Collins, P.J. Wood adhesives based on tannin extracts from barks of some pine and spruce species. Holz als Roh-und Werkstoff 52, 307–310 (1994). https://doi.org/10.1007/BF02621420
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DOI: https://doi.org/10.1007/BF02621420