DRYING STRATEGIES CAPABLE OF REDUCING THE STRESS LEVEL OF A STACK OF BOARDS AS DEFINED BY A COMPREHENSIVE DUAL SCALE MODEL

During drying, stresses and deformations develop in a wood board due to shrinkage fields which result from moisture content and temperature field variations. In spite of numerous works done in wood drying modelling in the last decades, wood drying optimisation based on modelling and simulation remai...

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Autores principales:	Rémond,Romain, Perré,Patrick
Lenguaje:	English
Publicado:	Universidad del Bío-Bío 2008
Materias:	Wood drying stack of boards dual scale model drying schedule drying stress
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2008000100001
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spelling	oai:scielo:S0718-221X20080001000012008-05-20DRYING STRATEGIES CAPABLE OF REDUCING THE STRESS LEVEL OF A STACK OF BOARDS AS DEFINED BY A COMPREHENSIVE DUAL SCALE MODELRémond,RomainPerré,Patrick Wood drying stack of boards dual scale model drying schedule drying stress During drying, stresses and deformations develop in a wood board due to shrinkage fields which result from moisture content and temperature field variations. In spite of numerous works done in wood drying modelling in the last decades, wood drying optimisation based on modelling and simulation remains far from initial expectations. Two main reasons can explain this assessment: the huge variability of wood and the variations in drying conditions throughout the board stack in a dryer. To address these two key problems, we used a dual scale numerical tool able to compute simultaneously the stress and deformation of hundreds of boards in the stack during drying. A rigorous one-dimensional mechanical formulation, based on previous works, has been used for calculating stress and deformation during drying. The mechanical model is fitted into a module and then added to a dual scale (board-stack) model. This numerical tool has been used to improve the drying schedules recommended by the Technical Centre for Wood and Furniture in France (CTBA) for spruce. The proposed drying schedules allow the board quality to be improved. Note that the optimisation was limited to medium temperature values, so that the proposed schedule can be applied to conventional kilnsinfo:eu-repo/semantics/openAccessUniversidad del Bío-BíoMaderas. Ciencia y tecnología v.10 n.1 20082008-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2008000100001en10.4067/S0718-221X2008000100001
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Wood drying stack of boards dual scale model drying schedule drying stress
spellingShingle	Wood drying stack of boards dual scale model drying schedule drying stress Rémond,Romain Perré,Patrick DRYING STRATEGIES CAPABLE OF REDUCING THE STRESS LEVEL OF A STACK OF BOARDS AS DEFINED BY A COMPREHENSIVE DUAL SCALE MODEL
description	During drying, stresses and deformations develop in a wood board due to shrinkage fields which result from moisture content and temperature field variations. In spite of numerous works done in wood drying modelling in the last decades, wood drying optimisation based on modelling and simulation remains far from initial expectations. Two main reasons can explain this assessment: the huge variability of wood and the variations in drying conditions throughout the board stack in a dryer. To address these two key problems, we used a dual scale numerical tool able to compute simultaneously the stress and deformation of hundreds of boards in the stack during drying. A rigorous one-dimensional mechanical formulation, based on previous works, has been used for calculating stress and deformation during drying. The mechanical model is fitted into a module and then added to a dual scale (board-stack) model. This numerical tool has been used to improve the drying schedules recommended by the Technical Centre for Wood and Furniture in France (CTBA) for spruce. The proposed drying schedules allow the board quality to be improved. Note that the optimisation was limited to medium temperature values, so that the proposed schedule can be applied to conventional kilns
author	Rémond,Romain Perré,Patrick
author_facet	Rémond,Romain Perré,Patrick
author_sort	Rémond,Romain
title	DRYING STRATEGIES CAPABLE OF REDUCING THE STRESS LEVEL OF A STACK OF BOARDS AS DEFINED BY A COMPREHENSIVE DUAL SCALE MODEL
title_short	DRYING STRATEGIES CAPABLE OF REDUCING THE STRESS LEVEL OF A STACK OF BOARDS AS DEFINED BY A COMPREHENSIVE DUAL SCALE MODEL
title_full	DRYING STRATEGIES CAPABLE OF REDUCING THE STRESS LEVEL OF A STACK OF BOARDS AS DEFINED BY A COMPREHENSIVE DUAL SCALE MODEL
title_fullStr	DRYING STRATEGIES CAPABLE OF REDUCING THE STRESS LEVEL OF A STACK OF BOARDS AS DEFINED BY A COMPREHENSIVE DUAL SCALE MODEL
title_full_unstemmed	DRYING STRATEGIES CAPABLE OF REDUCING THE STRESS LEVEL OF A STACK OF BOARDS AS DEFINED BY A COMPREHENSIVE DUAL SCALE MODEL
title_sort	drying strategies capable of reducing the stress level of a stack of boards as defined by a comprehensive dual scale model
publisher	Universidad del Bío-Bío
publishDate	2008
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2008000100001
work_keys_str_mv	AT remondromain dryingstrategiescapableofreducingthestresslevelofastackofboardsasdefinedbyacomprehensivedualscalemodel AT perrepatrick dryingstrategiescapableofreducingthestresslevelofastackofboardsasdefinedbyacomprehensivedualscalemodel
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DRYING STRATEGIES CAPABLE OF REDUCING THE STRESS LEVEL OF A STACK OF BOARDS AS DEFINED BY A COMPREHENSIVE DUAL SCALE MODEL

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