Journal ArticleDOI
The impact of drying and steaming processes on surface color changes of tension and normal beech wood
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TLDR
In this article, the results showed that different initial wood moisture content does not affect to final value of tension and normal wood and that the color changes were only noticed in the surface layers of specimens.Abstract:
Beech wood has a high frequency of defects such as red heartwood, reaction wood (tension wood). For the experimental measurements four logs without visible defects like red heartwood, which can noticeably affects the measurements' results were qualified. The drying medium temperature in the first phase of the process before the moisture content of the specimens fell below the FSP was maintained at 45 °C. Then, the temperature was gradually increased to the maximum value 65 °C. The results showed that different initial wood moisture content does not affect to final value of tension and normal wood. The colorimetric parameter L* was much higher for tension wood. After steaming, there were greater differences in the colorimetric parameters, respectively, a* and b*. After drying the difference of all colorimetric parameters between tension and normal wood was significantly less. The color changes were only noticed in the surface layers of specimens. Differences were small, and thus, the impact of the ...read more
Citations
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Journal ArticleDOI
Methodology of Temperature Monitoring in the Process of CNC Machining of Solid Wood
TL;DR: In this paper, the authors present a real-time measurement of tool temperature as a result of the machining process and verify the methodology of temperature monitoring in the process of computer numerical control machining in real time.
The effect of wood drying method on the granularity of sawdust obtained during the sawing process using the frame sawing machine
Kazimierz Orłowski,Daniel Chuchala,Tomasz Muzinski,Jacek Barański,Adrián Banski,Tomasz Rogoziński +5 more
TL;DR: In this article, the effect of drying processes of warm air drying at the temperature of 6580°C and warm air-steam mixture drying at 105°C of pine and beech wood to the size of sawdust grains created by cutting using RPW 15M frame saw is presented.
Journal ArticleDOI
Evaluation of the Process Thermal Treatment of Maple Wood Saturated Water Steam in Terms of Change of pH and Color of Wood
TL;DR: In this paper, the authors evaluated changes in maple wood's pH and color (Acer pseudoplatanus) before and after thermal treatment process with saturated water steam and calculated the correlation between the total color difference ∆E* of maple wood in the process of thermal color modification and the pH value.
Journal ArticleDOI
Effect of the Drying Method of Pine and Beech Wood on Fracture Toughness and Shear Yield Stress
Daniel Chuchala,Jakub Sandak,Kazimierz Orłowski,Tomasz Muzinski,Marcin Lackowski,Tomasz Ochrymiuk +5 more
TL;DR: An alternative methodology for determination of mechanical properties (fracture toughness and shear yield stress) based on cutting process analysis is presented here and provides a new highlight on the understanding of the effect of thermo-hydro modification of wood on mechanical performance of structures.
Journal ArticleDOI
Drying kinetics in Eucalyptus urophylla wood: analysis of anisotropy and region of the stem
Thiago Campos Monteiro,José Tarcísio Lima,Paulo Ricardo Gherardi Hein,José Reinaldo Moreira da Silva,Raul de Abreu Neto,Lucieli Rossi +5 more
TL;DR: In this paper, the authors examined the drying in Eucalyptus wood in different directions and regions and calculated flow rates of free (FRFW), bound (FRBW), and total water were calculated in three directions.
References
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Journal ArticleDOI
Mesoporosity as a new parameter for understanding tension stress generation in trees
Shan-Shan Chang,Shan-Shan Chang,Bruno Clair,Julien Ruelle,Jacques Beauchêne,Francesco Di Renzo,Françoise Quignard,Guang-Jie Zhao,Hiroyuki Yamamoto,Joseph Gril +9 more
TL;DR: Measurements show that mesoporosity is high in tension wood with a typical thick G-layer while it is much less with a thinner G- layer, sometimes no more than normal wood.
Journal ArticleDOI
Shrinkage of the gelatinous layer of poplar and beech tension wood
Bruno Clair,Bernard Thibaut +1 more
TL;DR: In this article, the authors showed that longitudinal shrinkage is much greater in the gelatinous layer than in other layers of beech and poplar tension wood than in normal wood, due to mechanical interactions of cell wall layers.
Journal ArticleDOI
A numerical drying model that accounts for the coupling between transfers and solid mechanics. case of highly deformable products
Patrick Perré,B. K. May +1 more
TL;DR: In this paper, the constitutive law is written on a local intermediate configuration in which rotation is chosen to oppose the rotation appearing in the polar decomposition of the deformation gradient tensor.
Journal ArticleDOI
Origin of the characteristic hygro-mechanical properties of the gelatinous layer in tension wood from Kunugi oak (Quercus acutissima)
TL;DR: The mechanism responsible for unusual hygro-mechanical properties of tension wood containing the gelatinous layer (G-layer) was investigated in this article, which revealed that the ratio of increase in the longitudinal Young's modulus with drying was higher in the G-layer than in the lignified layer (L-layer); the longitudinal drying shrinkage displayed a similar pattern.
Journal ArticleDOI
Mesoporosity changes from cambium to mature tension wood: a new step toward the understanding of maturation stress generation in trees.
TL;DR: Results show that mesoporous structures of TW and OW were very similar in early development stages before the deposition of G-layers, and this observation strongly supports the hypothesis of the swelling of the G-layer matrix during maturation as the origin of maturation stress in poplar tension wood.
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