USE OF A MODIFIED DRYING MEDIUM TO PREVENT DISCOLOURATION OF RADIATA PINE SAPWOOD DURING KILN DRYING

Wood darkening and kiln brown stain (KBS) in kiln drying has caused significant economic loss to the wood processing industry which. Although extensive studies have been performed, feasible drying techniques have not yet been developed to economically produce bright, pale colour wood from commercial...

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Autores principales:	Pang,S, Li,J
Lenguaje:	English
Publicado:	Universidad del Bío-Bío 2006
Materias:	kiln brown stain radiata pine sapwood oxygen-free drying medium bright pale colour
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2006000100005
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spelling	oai:scielo:S0718-221X20060001000052006-05-12USE OF A MODIFIED DRYING MEDIUM TO PREVENT DISCOLOURATION OF RADIATA PINE SAPWOOD DURING KILN DRYINGPang,SLi,J kiln brown stain radiata pine sapwood oxygen-free drying medium bright pale colour Wood darkening and kiln brown stain (KBS) in kiln drying has caused significant economic loss to the wood processing industry which. Although extensive studies have been performed, feasible drying techniques have not yet been developed to economically produce bright, pale colour wood from commercial drying. The current work research has been conducted to dry radiata pine sapwood in hot air and in modified oxygen-free drying medium, namely, gases A, B and C. Four sets of matched samples were dried at three different temperatures of 50, 70 and 90°C, one set in a tunnel dryer simulating commercial hot air drying and three sets in a newly designed stainless steel cylinder, which was placed in an oven, for tests using the three oxygen-free drying media. The results show that no obvious KBS was detected near the surface of sample boards dried in all of the oxygen-free gases except for one run using gas B at 70°C. However, for hot air drying, the discolouration of wood could only be reduced by drying at the low temperature of 50°C. How kiln drying in air at or above 70°C induces surface darkening and KBS. These results indicate that using an alternative non-oxygen atmosphere to kiln dry wood could reduce surface discolouration and KBSinfo:eu-repo/semantics/openAccessUniversidad del Bío-BíoMaderas. Ciencia y tecnología v.8 n.1 20062006-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2006000100005en10.4067/S0718-221X2006000100005
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	kiln brown stain radiata pine sapwood oxygen-free drying medium bright pale colour
spellingShingle	kiln brown stain radiata pine sapwood oxygen-free drying medium bright pale colour Pang,S Li,J USE OF A MODIFIED DRYING MEDIUM TO PREVENT DISCOLOURATION OF RADIATA PINE SAPWOOD DURING KILN DRYING
description	Wood darkening and kiln brown stain (KBS) in kiln drying has caused significant economic loss to the wood processing industry which. Although extensive studies have been performed, feasible drying techniques have not yet been developed to economically produce bright, pale colour wood from commercial drying. The current work research has been conducted to dry radiata pine sapwood in hot air and in modified oxygen-free drying medium, namely, gases A, B and C. Four sets of matched samples were dried at three different temperatures of 50, 70 and 90°C, one set in a tunnel dryer simulating commercial hot air drying and three sets in a newly designed stainless steel cylinder, which was placed in an oven, for tests using the three oxygen-free drying media. The results show that no obvious KBS was detected near the surface of sample boards dried in all of the oxygen-free gases except for one run using gas B at 70°C. However, for hot air drying, the discolouration of wood could only be reduced by drying at the low temperature of 50°C. How kiln drying in air at or above 70°C induces surface darkening and KBS. These results indicate that using an alternative non-oxygen atmosphere to kiln dry wood could reduce surface discolouration and KBS
author	Pang,S Li,J
author_facet	Pang,S Li,J
author_sort	Pang,S
title	USE OF A MODIFIED DRYING MEDIUM TO PREVENT DISCOLOURATION OF RADIATA PINE SAPWOOD DURING KILN DRYING
title_short	USE OF A MODIFIED DRYING MEDIUM TO PREVENT DISCOLOURATION OF RADIATA PINE SAPWOOD DURING KILN DRYING
title_full	USE OF A MODIFIED DRYING MEDIUM TO PREVENT DISCOLOURATION OF RADIATA PINE SAPWOOD DURING KILN DRYING
title_fullStr	USE OF A MODIFIED DRYING MEDIUM TO PREVENT DISCOLOURATION OF RADIATA PINE SAPWOOD DURING KILN DRYING
title_full_unstemmed	USE OF A MODIFIED DRYING MEDIUM TO PREVENT DISCOLOURATION OF RADIATA PINE SAPWOOD DURING KILN DRYING
title_sort	use of a modified drying medium to prevent discolouration of radiata pine sapwood during kiln drying
publisher	Universidad del Bío-Bío
publishDate	2006
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2006000100005
work_keys_str_mv	AT pangs useofamodifieddryingmediumtopreventdiscolourationofradiatapinesapwoodduringkilndrying AT lij useofamodifieddryingmediumtopreventdiscolourationofradiatapinesapwoodduringkilndrying
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USE OF A MODIFIED DRYING MEDIUM TO PREVENT DISCOLOURATION OF RADIATA PINE SAPWOOD DURING KILN DRYING

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