Abstract
Gmelina arborea (Roxb.) is widely used for commercial reforestation in Costa Rica due to its excellent growth rate and productivity. However, during the lumber drying process, the wooden boards show non-uniform values of final moisture content (MC). The low uniformity in final MC is caused by the presence of wet pockets, originated during the growing process of the tree. The regions with wet pockets present zones with a high MC, which are hard to detect with traditional methods for MC measurements during the wood drying process. It is possible to detect and to set the limits of the presence of wet wood in Gmelina arborea boards using scanning computed tomography (CT-scanning), a technique applied in medical diagnostic. A board with wet pockets is shown in the CT-scanning images in clear color and with low values of the Hounsfield Unit (HU) or CT number. When these values were transformed to wood density, it was determined that wet pockets were in a density of around 190 kg/m{sup 3}, a value higher than normal wood. Also, it was possible to observe growth tree rings in the CT-scanning images, an important feature for dendrochronological research. The obtained results allowed showing that it is possible
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Moya R, Roger;
Munoz A, Freddy;
[1]
Escalante, Ivan
[2]
- Inst. Tecnologico de Costa Rica, Escuela de Ingenieria Forestal, Apdo. 159-7050, Cartago 7050(Costa Rica)
- Clinica Santa Fe, San Jose (Costa Rica)
Citation Formats
Moya R, Roger, Munoz A, Freddy, and Escalante, Ivan.
Application of the axial tomography computed for the detection of bags of dampness in dry wood of Gmelina arborea (Roxb.); Aplicacion de la tomografia axial computarizada para la deteccion de bolsas de humedad en madera seca de Gmelina arborea (Roxb.).
Costa Rica: N. p.,
2006.
Web.
Moya R, Roger, Munoz A, Freddy, & Escalante, Ivan.
Application of the axial tomography computed for the detection of bags of dampness in dry wood of Gmelina arborea (Roxb.); Aplicacion de la tomografia axial computarizada para la deteccion de bolsas de humedad en madera seca de Gmelina arborea (Roxb.).
Costa Rica.
Moya R, Roger, Munoz A, Freddy, and Escalante, Ivan.
2006.
"Application of the axial tomography computed for the detection of bags of dampness in dry wood of Gmelina arborea (Roxb.); Aplicacion de la tomografia axial computarizada para la deteccion de bolsas de humedad en madera seca de Gmelina arborea (Roxb.)."
Costa Rica.
@misc{etde_21193028,
title = {Application of the axial tomography computed for the detection of bags of dampness in dry wood of Gmelina arborea (Roxb.); Aplicacion de la tomografia axial computarizada para la deteccion de bolsas de humedad en madera seca de Gmelina arborea (Roxb.)}
author = {Moya R, Roger, Munoz A, Freddy, and Escalante, Ivan}
abstractNote = {Gmelina arborea (Roxb.) is widely used for commercial reforestation in Costa Rica due to its excellent growth rate and productivity. However, during the lumber drying process, the wooden boards show non-uniform values of final moisture content (MC). The low uniformity in final MC is caused by the presence of wet pockets, originated during the growing process of the tree. The regions with wet pockets present zones with a high MC, which are hard to detect with traditional methods for MC measurements during the wood drying process. It is possible to detect and to set the limits of the presence of wet wood in Gmelina arborea boards using scanning computed tomography (CT-scanning), a technique applied in medical diagnostic. A board with wet pockets is shown in the CT-scanning images in clear color and with low values of the Hounsfield Unit (HU) or CT number. When these values were transformed to wood density, it was determined that wet pockets were in a density of around 190 kg/m{sup 3}, a value higher than normal wood. Also, it was possible to observe growth tree rings in the CT-scanning images, an important feature for dendrochronological research. The obtained results allowed showing that it is possible to apply this technique in the process of lumber production, to detect the zones with high MC in kiln dried Gmelina arborea wood. (author) [Spanish] Gmelina arborea (Roxb.) es muy utilizado para la reforestacion comercial en Costa Rica debido a su excelente tasa de crecimiento y la productividad. Sin embargo, durante el proceso de secado, las tablas de madera muestran uniformidad en los valores finales de contenido de humedad (MC). La escasa uniformidad final de MC es causado por la presencia de bolsas humedas, se origino durante el proceso de crecimiento del arbol. Las regiones que presentan bolsas de humedad con un alto MC son dificiles de detectar con los metodos tradicionales de mediciones de MC durante el proceso de secado de madera. Se muestra que es posible detectar y establecer los limites de la presencia de humedad en la madera de Gmelina arborea al lado de la exploracion de tomografia computarizada (CT-escaner), una tecnica aplicada en el diagnostico medico. Junto con las bolsas humedas, en la CT-del escaner se presentan imagenes de color gris y con valores bajos de la Unidad Hounsfield (UH) o numero CT. Cuando estos valores fueron transformados a la densidad de la madera, se determino que las bolsas humedas estaban a una densidad de unos 190 kg/m{sup 3}, un valor superior al normal de la madera. Ademas, fue posible observar el crecimiento de anillos de arboles en la CT-del escaneo de imagenes, una caracteristica importante para la investigacion dendrocronologica. Los resultados obtenidos permitieron demostrar que es posible aplicar esta tecnica en el proceso de produccion de madera, para detectar las zonas con un alto MC en el secado de la madera de Gmelina arborea. (autor)}
journal = []
issue = {2}
volume = {24}
place = {Costa Rica}
year = {2006}
month = {Jul}
}
title = {Application of the axial tomography computed for the detection of bags of dampness in dry wood of Gmelina arborea (Roxb.); Aplicacion de la tomografia axial computarizada para la deteccion de bolsas de humedad en madera seca de Gmelina arborea (Roxb.)}
author = {Moya R, Roger, Munoz A, Freddy, and Escalante, Ivan}
abstractNote = {Gmelina arborea (Roxb.) is widely used for commercial reforestation in Costa Rica due to its excellent growth rate and productivity. However, during the lumber drying process, the wooden boards show non-uniform values of final moisture content (MC). The low uniformity in final MC is caused by the presence of wet pockets, originated during the growing process of the tree. The regions with wet pockets present zones with a high MC, which are hard to detect with traditional methods for MC measurements during the wood drying process. It is possible to detect and to set the limits of the presence of wet wood in Gmelina arborea boards using scanning computed tomography (CT-scanning), a technique applied in medical diagnostic. A board with wet pockets is shown in the CT-scanning images in clear color and with low values of the Hounsfield Unit (HU) or CT number. When these values were transformed to wood density, it was determined that wet pockets were in a density of around 190 kg/m{sup 3}, a value higher than normal wood. Also, it was possible to observe growth tree rings in the CT-scanning images, an important feature for dendrochronological research. The obtained results allowed showing that it is possible to apply this technique in the process of lumber production, to detect the zones with high MC in kiln dried Gmelina arborea wood. (author) [Spanish] Gmelina arborea (Roxb.) es muy utilizado para la reforestacion comercial en Costa Rica debido a su excelente tasa de crecimiento y la productividad. Sin embargo, durante el proceso de secado, las tablas de madera muestran uniformidad en los valores finales de contenido de humedad (MC). La escasa uniformidad final de MC es causado por la presencia de bolsas humedas, se origino durante el proceso de crecimiento del arbol. Las regiones que presentan bolsas de humedad con un alto MC son dificiles de detectar con los metodos tradicionales de mediciones de MC durante el proceso de secado de madera. Se muestra que es posible detectar y establecer los limites de la presencia de humedad en la madera de Gmelina arborea al lado de la exploracion de tomografia computarizada (CT-escaner), una tecnica aplicada en el diagnostico medico. Junto con las bolsas humedas, en la CT-del escaner se presentan imagenes de color gris y con valores bajos de la Unidad Hounsfield (UH) o numero CT. Cuando estos valores fueron transformados a la densidad de la madera, se determino que las bolsas humedas estaban a una densidad de unos 190 kg/m{sup 3}, un valor superior al normal de la madera. Ademas, fue posible observar el crecimiento de anillos de arboles en la CT-del escaneo de imagenes, una caracteristica importante para la investigacion dendrocronologica. Los resultados obtenidos permitieron demostrar que es posible aplicar esta tecnica en el proceso de produccion de madera, para detectar las zonas con un alto MC en el secado de la madera de Gmelina arborea. (autor)}
journal = []
issue = {2}
volume = {24}
place = {Costa Rica}
year = {2006}
month = {Jul}
}