INDUSTRIAL EVALUATION OF RE-DRY STRATEGY FOR SOFTWOOD LUMBER

This paper presents an experimental evaluation of the first commercial scale dry-sort-redry (DSRD) strategy for drying of 2x4 Pacific coast hemlock (PCH) lumber. The DSRD strategy is a methodology designed to reduce final moisture content variability in kiln dried lumber by complementing conventiona...

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Autores principales:	Elustondo,Diego, Avramidis,Stavros
Lenguaje:	English
Publicado:	Universidad del Bío-Bío 2005
Materias:	lumber drying re-drying radio-frequency modeling
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2005000200001
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spelling	oai:scielo:S0718-221X20050002000012005-11-28INDUSTRIAL EVALUATION OF RE-DRY STRATEGY FOR SOFTWOOD LUMBERElustondo,DiegoAvramidis,Stavros lumber drying re-drying radio-frequency modeling This paper presents an experimental evaluation of the first commercial scale dry-sort-redry (DSRD) strategy for drying of 2x4 Pacific coast hemlock (PCH) lumber. The DSRD strategy is a methodology designed to reduce final moisture content variability in kiln dried lumber by complementing conventional drying with radio frequency vacuum (RFV) drying technology. The strategy′s objective is to avoid producing over-dried lumber in conventional drying by setting the target moisture content to a value much higher than those usually used in industry. Then, RFV drying technology is implemented to quickly and efficiently re-dry the lumber that remains wet (under-dried) after the first conventional pass. Six experimental tests were performed in an industrial sawmill with the intention of studying the effect of target moisture content on the properties and quality of the dried lumber. In all cases, the first drying pass was performed in a 260m³ industrial heat-and-vent conventional kiln, and the re-drying of wets was performed in a 75m³ RFV kiln. Additionally, a mathematical model developed for prediction of data dispersion in lumber drying was calibrated with experimental data, and used to simulate the DSRD strategy under other hypothetical conditions. The results of the study demonstrate that the DSRD strategy reduces drying time, shrinkage and kiln drying degrade in comparison with a single conventional passinfo:eu-repo/semantics/openAccessUniversidad del Bío-BíoMaderas. Ciencia y tecnología v.7 n.2 20052005-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2005000200001en10.4067/S0718-221X2005000200001
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	lumber drying re-drying radio-frequency modeling
spellingShingle	lumber drying re-drying radio-frequency modeling Elustondo,Diego Avramidis,Stavros INDUSTRIAL EVALUATION OF RE-DRY STRATEGY FOR SOFTWOOD LUMBER
description	This paper presents an experimental evaluation of the first commercial scale dry-sort-redry (DSRD) strategy for drying of 2x4 Pacific coast hemlock (PCH) lumber. The DSRD strategy is a methodology designed to reduce final moisture content variability in kiln dried lumber by complementing conventional drying with radio frequency vacuum (RFV) drying technology. The strategy′s objective is to avoid producing over-dried lumber in conventional drying by setting the target moisture content to a value much higher than those usually used in industry. Then, RFV drying technology is implemented to quickly and efficiently re-dry the lumber that remains wet (under-dried) after the first conventional pass. Six experimental tests were performed in an industrial sawmill with the intention of studying the effect of target moisture content on the properties and quality of the dried lumber. In all cases, the first drying pass was performed in a 260m³ industrial heat-and-vent conventional kiln, and the re-drying of wets was performed in a 75m³ RFV kiln. Additionally, a mathematical model developed for prediction of data dispersion in lumber drying was calibrated with experimental data, and used to simulate the DSRD strategy under other hypothetical conditions. The results of the study demonstrate that the DSRD strategy reduces drying time, shrinkage and kiln drying degrade in comparison with a single conventional pass
author	Elustondo,Diego Avramidis,Stavros
author_facet	Elustondo,Diego Avramidis,Stavros
author_sort	Elustondo,Diego
title	INDUSTRIAL EVALUATION OF RE-DRY STRATEGY FOR SOFTWOOD LUMBER
title_short	INDUSTRIAL EVALUATION OF RE-DRY STRATEGY FOR SOFTWOOD LUMBER
title_full	INDUSTRIAL EVALUATION OF RE-DRY STRATEGY FOR SOFTWOOD LUMBER
title_fullStr	INDUSTRIAL EVALUATION OF RE-DRY STRATEGY FOR SOFTWOOD LUMBER
title_full_unstemmed	INDUSTRIAL EVALUATION OF RE-DRY STRATEGY FOR SOFTWOOD LUMBER
title_sort	industrial evaluation of re-dry strategy for softwood lumber
publisher	Universidad del Bío-Bío
publishDate	2005
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2005000200001
work_keys_str_mv	AT elustondodiego industrialevaluationofredrystrategyforsoftwoodlumber AT avramidisstavros industrialevaluationofredrystrategyforsoftwoodlumber
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INDUSTRIAL EVALUATION OF RE-DRY STRATEGY FOR SOFTWOOD LUMBER

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