Einfluß der Verkernung und des Baumalters auf die Eigenschaften von Spanplatten aus Kiefernholz (Pinus sylvestris) Teil 1: Kernholz und seine Eigenschaften

Abstract

Die Eigenschaften yon Spanplatten werden vorwiegend dutch die Eigenschaften der eingesetzten Rohstoffe Holz und Bindemittel sowie dutch die Wechselwirkung zwischen ihnen bestimmt. Ziel eines Forschungsvorhabens war es, die natfirliche Dauerhaftigkeit des Kernholzes der in der Bundesrepublik Deutschland vorkommenden extraktstoffreichen Baumarten Kiefer, Douglasie, L/irche und Eiche bei der Herstellung von Spanplatten mit hoher biotogischer Resistenz gegenfiber holzzerst/Srenden Pilzen zu nutzen. Innerhalb dieser Zielsetzung war es yon Bedeutung, die Wechselwirkung zwischen dem Splint-und Kernholz yon obligatorisch verkernten wichtigen Nadelbaumarten und den Bindemitteln zu untersuchen. Die Ergebnisse werden in einer Ver6ffentlichungsreihe dargestellt. In diesem Beitrag wird eine Ubersicht fiber die Eigenschaften von Kernholz und deren Einflufl auf die Dauerhaftigkeit des Holzes insbesondere bei der Kiefer gegeben. Influence of heartwood and the age of tree on the properties of particleboards from pine Part 1: Heartwood and its propertiesThe properties of particleboards depend mainly on the lignocellulosic raw materials and the binders used for their preparation as well as on the interaction between the raw materials and the binders. The main objective of a research work was to use the natural durability of heartwood from different tree species such as pine, Douglas fir, larch and oak for the production of particleboard with high biological resistance. The results of the research work will he published in a series of articles in the journal. In this article the state of knowledge on the properties of heartwood from different species is discussed with main emphasis on pine wood.

A screening study on extractive content and composition of Scots pine heartwood of three stands with close proximity and their resistance against basidiomycetes

“…A similar trend was also reported in a review by Dix and Roffael (1997), who determined lower pinosylvin concentrations in the inner heartwood. Venäläinen et al .…”

“…A similar trend was also reported in a review by Dix and Roffael (1997), who determined lower pinosylvin concentrations in the inner heartwood. Venäläinen et al (2003), however, found no difference in the total amount of extractives between inner and outer heartwood, but the amount of stilbenes (pinosylvin and pinosylvin monomethyl ether) in the inner heartwood was also lower when compared with the outer heartwood.…”

Pine Extractives Strongly Affect Lignin Thermochemical Pathways

“…That study ignored the influence of wood extractives (nonstructural phytochemicals) that might directly generate CH 2 O, catalyze lignin to do so, or reduce emissions by reacting with CH 2 O. ,− Schäfer and Roffael’s data suggested a catalytic role of wood extractives in CH 2 O generation; a discussion of that possibility appeared elsewhere . In this study, wood from P. virginiana , P. radiata , and Liriodendron tulipifera was studied with respect to the impact of extractives removal on CH 2 O generation during heating (200 °C, 10 min).…”

Lignin Acidolysis Predicts Formaldehyde Generation in Pine Wood

“…All organic wood components are capable of generating CH 2 O, but lignin appears to be the major source. , Wood extractives are not addressed here, but it is known that the extractives can directly generate CH 2 O, or they may catalyze CH 2 O generation, or they react with CH 2 O such that emissions are reduced. − Excluding extractives, this is a study of Virginia pine (Pinus virginiana) to determine the CH 2 O generation potential of its structural biopolymers. Specimens were heated at 200 °C for 10 or 60 min, where the 10 min treatment crudely simulates industrial hot-press conditions.…”