MICROSTRUCTURAL AND PHYSICAL ASPECTS OF HEAT TREATED WOOD: PART 2. HARDWOODS

Heat treatment of wood is an effective method to improve the dimensional stability and durability against biodegradation. Optimisation of a two-stage heat treatment process at relatively mild conditions (<200°C) and its effect on the anatomical structure of hardwoods were investigated by means of...

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Autores principales:	Boonstra,M.J, Rijsdijk,J.F, Sander,C, Kegel,E, Tjeerdsma,B, Militz,H, van Acker,J, Stevens,M
Lenguaje:	English
Publicado:	Universidad del Bío-Bío 2006
Materias:	Wood modification heat treatment hardwood microscopy
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2006000300007
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spelling	oai:scielo:S0718-221X20060003000072006-12-01MICROSTRUCTURAL AND PHYSICAL ASPECTS OF HEAT TREATED WOOD: PART 2. HARDWOODSBoonstra,M.JRijsdijk,J.FSander,CKegel,ETjeerdsma,BMilitz,Hvan Acker,JStevens,M Wood modification heat treatment hardwood microscopy Heat treatment of wood is an effective method to improve the dimensional stability and durability against biodegradation. Optimisation of a two-stage heat treatment process at relatively mild conditions (<200°C) and its effect on the anatomical structure of hardwoods were investigated by means of a light and scanning electron microscopic analysis. Hardwood species such as beech and poplar, were predominantly sensitive to collaps of the vessels and some deformation of the libriform fibres directly near the vessels. In treated beech and birch radial cracks were observed near the rays. Optimisation of the heat treatment process conditions including the application of a steam hydro thermolysis stage reduced such damages to a minimum. Broken cell walls perpendicular to the fibre direction resulting in transverse ruptures has been noticed in heat treated hardwood species. This contributes to abrupt fractures of treated wood as observed in bending tests which can lead to considerably different failure behavior after impact of mechanical stress. In some treated hardwood species maceration (small cracks between tracheids) was noticed after heat treatment. Heat treatment did not reveal damage to the ray parenchyma pit membranes, bordered pits and large window pit membranes; and the margo fibrils appeared without damageinfo:eu-repo/semantics/openAccessUniversidad del Bío-BíoMaderas. Ciencia y tecnología v.8 n.3 20062006-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2006000300007en10.4067/S0718-221X2006000300007
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Wood modification heat treatment hardwood microscopy
spellingShingle	Wood modification heat treatment hardwood microscopy Boonstra,M.J Rijsdijk,J.F Sander,C Kegel,E Tjeerdsma,B Militz,H van Acker,J Stevens,M MICROSTRUCTURAL AND PHYSICAL ASPECTS OF HEAT TREATED WOOD: PART 2. HARDWOODS
description	Heat treatment of wood is an effective method to improve the dimensional stability and durability against biodegradation. Optimisation of a two-stage heat treatment process at relatively mild conditions (<200°C) and its effect on the anatomical structure of hardwoods were investigated by means of a light and scanning electron microscopic analysis. Hardwood species such as beech and poplar, were predominantly sensitive to collaps of the vessels and some deformation of the libriform fibres directly near the vessels. In treated beech and birch radial cracks were observed near the rays. Optimisation of the heat treatment process conditions including the application of a steam hydro thermolysis stage reduced such damages to a minimum. Broken cell walls perpendicular to the fibre direction resulting in transverse ruptures has been noticed in heat treated hardwood species. This contributes to abrupt fractures of treated wood as observed in bending tests which can lead to considerably different failure behavior after impact of mechanical stress. In some treated hardwood species maceration (small cracks between tracheids) was noticed after heat treatment. Heat treatment did not reveal damage to the ray parenchyma pit membranes, bordered pits and large window pit membranes; and the margo fibrils appeared without damage
author	Boonstra,M.J Rijsdijk,J.F Sander,C Kegel,E Tjeerdsma,B Militz,H van Acker,J Stevens,M
author_facet	Boonstra,M.J Rijsdijk,J.F Sander,C Kegel,E Tjeerdsma,B Militz,H van Acker,J Stevens,M
author_sort	Boonstra,M.J
title	MICROSTRUCTURAL AND PHYSICAL ASPECTS OF HEAT TREATED WOOD: PART 2. HARDWOODS
title_short	MICROSTRUCTURAL AND PHYSICAL ASPECTS OF HEAT TREATED WOOD: PART 2. HARDWOODS
title_full	MICROSTRUCTURAL AND PHYSICAL ASPECTS OF HEAT TREATED WOOD: PART 2. HARDWOODS
title_fullStr	MICROSTRUCTURAL AND PHYSICAL ASPECTS OF HEAT TREATED WOOD: PART 2. HARDWOODS
title_full_unstemmed	MICROSTRUCTURAL AND PHYSICAL ASPECTS OF HEAT TREATED WOOD: PART 2. HARDWOODS
title_sort	microstructural and physical aspects of heat treated wood: part 2. hardwoods
publisher	Universidad del Bío-Bío
publishDate	2006
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2006000300007
work_keys_str_mv	AT boonstramj microstructuralandphysicalaspectsofheattreatedwoodpart2hardwoods AT rijsdijkjf microstructuralandphysicalaspectsofheattreatedwoodpart2hardwoods AT sanderc microstructuralandphysicalaspectsofheattreatedwoodpart2hardwoods AT kegele microstructuralandphysicalaspectsofheattreatedwoodpart2hardwoods AT tjeerdsmab microstructuralandphysicalaspectsofheattreatedwoodpart2hardwoods AT militzh microstructuralandphysicalaspectsofheattreatedwoodpart2hardwoods AT vanackerj microstructuralandphysicalaspectsofheattreatedwoodpart2hardwoods AT stevensm microstructuralandphysicalaspectsofheattreatedwoodpart2hardwoods
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MICROSTRUCTURAL AND PHYSICAL ASPECTS OF HEAT TREATED WOOD: PART 2. HARDWOODS

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