Publications
NIBIOs employees contribute to several hundred scientific articles and research reports every year. You can browse or search in our collection which contains references and links to these publications as well as other research and dissemination activities. The collection is continously updated with new and historical material.
2012
Authors
Frank MillerAbstract
No abstract has been registered
Authors
Steffi Munack Kathrin Roderer Jurate Kamarauskaite Gabriele Cordara Andre van Eerde Peter Kast Ute KrengelAbstract
No abstract has been registered
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Clive Kaiser Lynn E. Long Mekjell MelandAbstract
No abstract has been registered
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Sebastian EiterAbstract
No abstract has been registered
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Habtamu AlemAbstract
No abstract has been registered
Authors
Andreas TreuAbstract
No abstract has been registered
Abstract
The objective of the project Winfur (within WoodWisdomNet) was the industrial application of furfurylated wood in the window market. Because of promising results concerning the wood species European beech, common ash, radiata pine and Southern yellow pine it was decided to evaluate material from these species.The material exhibits promising wood water related behaviour. Coating tests showed the coatability with selected commercial products. Additionally, outdoor weathering tests were performed. It is also possible to produce 3-layer scantlings with common gluing systems like PVAc. The resistance against wood destroying fungi increased in a way that the material is suitable for the window application. Different investigations were performed to test the furfurylated material and the results are satisfying.The last step in the project was the production of prototypes for different investigations. The window companies reported no differences between using furfurylated wood compared to untreated wood within the production of the windows. The tests of full scale window prototypes according to seven test standards, e.g. repeated opening and closing and water tightness against driving rain were performed.The production and standardised testing of full-scale window prototypes indicates that the use of furfurylated wood will not cause any problems with fulfilling the criteria for the Scandinavian P-mark and the German RAL certificate. The overall conclusion is that furfurylated wood material is suitable for the window production.
Abstract
Brown-rot fungi such as Postia placenta are common inhabitants of forest ecosystems and brown rot fungi are also largely responsible for the destructive decay of wooden structures. The aim of this study was to compare two commonly used strains of Postia placenta MAD-698-R and FPRL 280. Scots pine sapwood samples were exposed for two and eight weeks to both fungal strains. The following was investigated: mass loss, fungal gDNA content and gene expression.A significant difference was found in mass loss after eight weeks between the P. placenta strains MAD-698-R and FPRL 280. MAD-698-R gave higher mass loss than FPRL 280. However, MAD-698-R seems to have a slightly slower growth rate than FPRL 280, reflected in lower gDNA content after two weeks.After eight weeks of exposure the gDNA content dropped and no significant difference was found between MAD-698-R and FPRL 280. We observed differences in mass loss, colonization-rate and gene expression between the two Postia strains. Results suggest significant differences in the regulation of key lignocellulose degrading enzymes between MAD-698-R and FPRL 280.
Authors
Peder Gjerdrum Birger EikenesAbstract
Density is one of the most basic quality traits, influential for wood processing and most applications. The aim of this paper has been to present a mathematical model for dry density variation along spruce stems. 85 mature spruce trees were sampled from afforestation plantations at the west coast region of Norway. 20 mm wide cubes of clear wood were extracted from the pith outwards in north and south directions at 10 equidistant heights along the trunk. Green and dry weight and volume were recorded. In this way, the 85 stems yielded 523 disks and a total of 6019 valid observation sets. A mathematically expressed model for density variation is presented. Overall R2 = 0.64, of which between stem variation s = 35 kg/m3 accounts for two thirds. The model standard error is 32 kg/m3; however, the model fails to identify the most extreme density values. The most important results are the quantitative, mathematical form of the model, and the identification of a general density minimum at a certain distance from the pith.
Authors
Christian Brischke Christian Welzbacher Antje Gellerich Susanne Bollmus Katharina Plaschkies Wolfram Scheiding Gry Alfredsen Joris Van Acker Imke De WindtAbstract
Die Dauerhaftigkeit von Holz gegenber Basidiomyceten wird in Europa nach CEN/TS 15083-1 (2005) bestimmt. Die bisherigen Erfahrungen mit diesem Standard sind sehr heterogen, und Ergebnisse frherer Ringversuche teilweise nicht oder nur unvollstndig verffentlicht. Insbesondere die Notwendigkeit einer natrlichen Vorbewitterung der Prfkrper, u.a. mit dem Ziel einer Detoxifizierung des Materials, wird kontrovers diskutiert. Fnf europische Forschungseinrichtungen haben sich deshalb zu einem neuen Ringversuch zusammengeschlossen, in dem die Dauerhaftigkeit gegen holzzerstrende Pilze von fnf Holzarten mit und ohne Auswaschbeanspruchung bzw. 6-monatiger natrlicher Vorbewitterung gegen Coniophora puteana und Trametes versicolor geprft wurden. Es ergaben sich Unterschiede in der Dauerhaftigkeitsklassifizierung zwischen den Prfinstituten (bis zu vier Klassen) sowie in Abhngigkeit von der Vorbeanspruchung und den statistischen Auswertungsgren. Die natrliche Vorbewitterung der Prfkrper hatte teilweise eine Angleichung der Dauerhaftigkeitsklassifizierung zwischen den Prfinstituten zur Folge. In allen Fllen wurde eine Homogenisierung der Dauerhaftigkeitseinschtzung durch Vorbewitterung jedoch nicht erreicht. Generelle Aussagen zum Einfluss der Vorbeanspruchung auf die Klassifizierung der Dauerhaftigkeiten lieen sich somit nicht ableiten, weshalb diese weder zwingend zu empfehlen noch abzulehnen ist.