THE EFFECT OF DRYING AND STORAGE CONDITIONS ON CASE HARDENING OF SCOTS PINE AND NORWAY SPRUCE TIMBER

Case hardening is a feature of dried wood that causes the wood to deform (cup) after re-sawing and equalising the moisture content. VTT has analysed case hardening with the aid of the simulation model PEO and with experimental drying, conditioning and storage tests. Case hardening cannot be predicte...

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Autores principales:	Tarvainen,V, Ranta-Maunus,A, Hanhijärvi,A, Forsén,H
Lenguaje:	English
Publicado:	Universidad del Bío-Bío 2006
Materias:	case hardening cupping drying conditioning re-sawing simulation Scots Pine Norway spruce
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2006000100001
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spelling	oai:scielo:S0718-221X20060001000012006-05-12THE EFFECT OF DRYING AND STORAGE CONDITIONS ON CASE HARDENING OF SCOTS PINE AND NORWAY SPRUCE TIMBERTarvainen,VRanta-Maunus,AHanhijärvi,AForsén,H case hardening cupping drying conditioning re-sawing simulation Scots Pine Norway spruce Case hardening is a feature of dried wood that causes the wood to deform (cup) after re-sawing and equalising the moisture content. VTT has analysed case hardening with the aid of the simulation model PEO and with experimental drying, conditioning and storage tests. Case hardening cannot be predicted by the moisture content gradient alone. However, the case hardening gap after drying to a high final moisture content of 18% is nearly identical to the calculated gap caused by cupping when the moisture gradients of the two halves of the test piece are equalised. 24 hours (proposed in ENV 14464) is too little time to show the total cupping when keeping the sliced specimens in a plastic bag. Thus the test according the standard doesnt show the whole cupping tendency of, for example, panels when the moisture content is equalised after re-sawing the timber and planing the billets. Increasing the kiln drying rate increases the resulting case hardening tendency. With effective conditioning at the drying temperature, or with steaming after cooling, it is possible to reduce or remove the case hardening. But at normal temperatures in end-use or storage of timber the case hardening diminishes very slowly, despite the equalising of the moisture content in the cross-sectioninfo: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=S0718-221X2006000100001en10.4067/S0718-221X2006000100001
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	case hardening cupping drying conditioning re-sawing simulation Scots Pine Norway spruce
spellingShingle	case hardening cupping drying conditioning re-sawing simulation Scots Pine Norway spruce Tarvainen,V Ranta-Maunus,A Hanhijärvi,A Forsén,H THE EFFECT OF DRYING AND STORAGE CONDITIONS ON CASE HARDENING OF SCOTS PINE AND NORWAY SPRUCE TIMBER
description	Case hardening is a feature of dried wood that causes the wood to deform (cup) after re-sawing and equalising the moisture content. VTT has analysed case hardening with the aid of the simulation model PEO and with experimental drying, conditioning and storage tests. Case hardening cannot be predicted by the moisture content gradient alone. However, the case hardening gap after drying to a high final moisture content of 18% is nearly identical to the calculated gap caused by cupping when the moisture gradients of the two halves of the test piece are equalised. 24 hours (proposed in ENV 14464) is too little time to show the total cupping when keeping the sliced specimens in a plastic bag. Thus the test according the standard doesnt show the whole cupping tendency of, for example, panels when the moisture content is equalised after re-sawing the timber and planing the billets. Increasing the kiln drying rate increases the resulting case hardening tendency. With effective conditioning at the drying temperature, or with steaming after cooling, it is possible to reduce or remove the case hardening. But at normal temperatures in end-use or storage of timber the case hardening diminishes very slowly, despite the equalising of the moisture content in the cross-section
author	Tarvainen,V Ranta-Maunus,A Hanhijärvi,A Forsén,H
author_facet	Tarvainen,V Ranta-Maunus,A Hanhijärvi,A Forsén,H
author_sort	Tarvainen,V
title	THE EFFECT OF DRYING AND STORAGE CONDITIONS ON CASE HARDENING OF SCOTS PINE AND NORWAY SPRUCE TIMBER
title_short	THE EFFECT OF DRYING AND STORAGE CONDITIONS ON CASE HARDENING OF SCOTS PINE AND NORWAY SPRUCE TIMBER
title_full	THE EFFECT OF DRYING AND STORAGE CONDITIONS ON CASE HARDENING OF SCOTS PINE AND NORWAY SPRUCE TIMBER
title_fullStr	THE EFFECT OF DRYING AND STORAGE CONDITIONS ON CASE HARDENING OF SCOTS PINE AND NORWAY SPRUCE TIMBER
title_full_unstemmed	THE EFFECT OF DRYING AND STORAGE CONDITIONS ON CASE HARDENING OF SCOTS PINE AND NORWAY SPRUCE TIMBER
title_sort	effect of drying and storage conditions on case hardening of scots pine and norway spruce timber
publisher	Universidad del Bío-Bío
publishDate	2006
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2006000100001
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THE EFFECT OF DRYING AND STORAGE CONDITIONS ON CASE HARDENING OF SCOTS PINE AND NORWAY SPRUCE TIMBER

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