Wood Science and Technology

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Nondestructive detection of cracks near the surface of wooden boards by dynamic heat dissipation
Wood Science and Technology - Tập 48 - Trang 773-786 - 2014
Minoru Aoyagi, Takefumi Hiraguri, Takahiro Ueno
A method to detect cracks near the surface of wooden boards has been developed where the change in surface temperature of the wood sample is monitored using an infrared camera following momentary heating by a flash. Cylindrical holes simulating cracks were drilled into the wood samples, and blackbody paint was painted onto the surface of the samples to assist flash absorption. This method uses the...... hiện toàn bộ
Wettability of Sitka spruce timber stored in a Scottish sawmill yard
Wood Science and Technology - Tập 35 - Trang 107-115 - 2001
C. J. Payne, S. Woodward, J. A. Petty
Kiln-dried and air-dried Sitka spruce battens were exposed to outdoor weathering within stickered, close packed and wrapped packs and at the upper surface of these packs. A four-week exposure period was used in James Jones and Sons Ltd. sawmill yard near Aboyne, NE Scotland. The wettability of batten samples removed from the packs of timber was determined by a drop contact angle method using a vi...... hiện toàn bộ
Assessment of the effectiveness of liquid hot water and steam explosion pretreatments of fast-growing poplar (Populus trichocarpa) wood
Wood Science and Technology - Tập 56 - Trang 87-109 - 2021
Andrzej Antczak, Jan Szadkowski, Dominika Szadkowska, Janusz Zawadzki
In this paper, the influence of physicochemical pretreatment methods on the chemical composition, enzymatic hydrolysis efficiency and porosity of fast-growing Populus trichocarpa wood was compared. Among the pretreatment methods, the liquid hot water (LHW) and steam explosion (SE) were used, which were performed at three different temperatures (160 °C, 175 °C and 190 °C) and two residence times (1...... hiện toàn bộ
Lattice Boltzmann simulations of diffusion through native and steam-exploded softwood bordered pits
Wood Science and Technology - - 2017
Patric Kvist, Adam Therning, Tobias Gebäck, Anders Rasmuson
A model for unsteady-state gas flow in the longitudinal direction of wood
Wood Science and Technology - - 1976
J. F. Siau
Distribution of chemical components in the walls of kraft and bisulphite pulp fibres
Wood Science and Technology - Tập 10 - Trang 39-46 - 1976
R. P. Kibblewhite, Diane Brookes
Fines removed from the surfaces of Pinus radiata fibres by beating were identified and characterised in terms of microfibril orientations in the surfaces of beaten fibres. Fines fractions subjected to chemical analyses were selected so that chemical component data could be related to specific layers or lamellae in fibre walls. Carbohydrate distributions within the walls of kraft fibres differed fr...... hiện toàn bộ
Modification of three hardwoods with an N-methylol melamine compound and a metal-complex dye
Wood Science and Technology - Tập 48 - Trang 123-136 - 2013
Bodo Caspar Kielmann, Stergios Adamopoulos, Holger Militz, Gerald Koch, Carsten Mai
This study evaluated the combined modification and staining of ash, beech and maple wood with a low molecular weight N-methylol melamine compound (NMM) and a metal-complex dye. Wood samples were treated with aqueous solutions of 10, 20 and 30 wt% NMM and 5 wt% of the dye. The treatment caused the fixation of the water-soluble dye by the NMM resin. Vacuum pressure impregnation of unsealed wood bloc...... hiện toàn bộ
Growth stress patterns in tree stems
Wood Science and Technology - Tập 24 - Trang 131-142 - 1990
M. Fournier, P. A. Bordonné, D. Guitard, T. Okuyama
Growth stresses originate in maturation strains, induced in cambial layers during the differentiation and the maturation of new cells, impeded by the mass of the whole trunk. To predict stresses in a stem, one must add successive incremental stresses at successively created points of the growing trunk. Usual measurements of released strains at the surface of a stem do not give the evolution of mat...... hiện toàn bộ
FTIR spectroscopy, chemical and histochemical characterisation of wood and lignin of five tropical timber wood species of the family of Dipterocarpaceae
Wood Science and Technology - Tập 44 - Trang 225-242 - 2009
Rumana Rana, Rosemarie Langenfeld-Heyser, Reiner Finkeldey, Andrea Polle
The goal of this study was to characterise chemical and histochemical properties of five dipterocarp timber wood species (Dipterocarpus kerrii, Hopea plagata, Parashorea malaanoman, Shorea almon, and Shorea contorta) differing in wood service life and utilisation. Wood of H. plagata, the most durable species, contained the lowest concentrations of nitrogen and ligno-protein, the highest C/N ratio ...... hiện toàn bộ
A new analytical approach to investigate the influence of wood extracts on the curing properties of phenol-resorcinol–formaldehyde (PRF) adhesives
Wood Science and Technology - Tập 56 - Trang 349-365 - 2022
Merve Özparpucu, Elisabeth Windeisen-Holzhauser, Gerd Wegener, Klaus Richter
In this study, the interactions between a phenol–formaldehyde resorcinol (PRF) adhesive and water-extractable wood constituents were investigated using combined in-situ FTIR spectroscopy and rheology analysis for a simultaneous examination of the progress of chemical reactions and coherent changes in rheological properties during adhesive curing. Complementary evolved gas analysis and pyrolysis ga...... hiện toàn bộ
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