Microstructural and physical aspects of heat treated wood. Part 2. Hardwoods
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| Format: | Artículo científico |
| Langue: | en |
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Universidad del Bío Bío
2006
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| _version_ | 1876438968045666304 |
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| author | M.J. Boonstra |
| author_facet | M.J. Boonstra |
| contents | Microstructural and physical aspects of heat treated wood. Part 2. Hardwoods M.J. Boonstra J.F. Rijsdijk C. Sander B. Tjeerdsma H. Militz J. van Acker M. Stevens E. Kegel Agrociencias hardwood microscopy heat treatment Wood modification Heat treatment of wood is an effective method to improve the dimensional stability and durabilityagainst 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 lightand scanning electron microscopic analysis. Hardwood species such as beech and poplar, werepredominantly sensitive to collaps of the vessels and some deformation of the libriform fibres directlynear the vessels. In treated beech and birch radial cracks were observed near the rays. Optimisation ofthe heat treatment process conditions including the application of a steam hydro thermolysis stage reducedsuch damages to a minimum. Broken cell walls perpendicular to the fibre direction resulting in transverseruptures has been noticed in heat treated hardwood species. This contributes to abrupt fractures oftreated wood as observed in bending tests which can lead to considerably different failure behavior afterimpact of mechanical stress. In some treated hardwood species maceration (small cracks betweentracheids) was noticed after heat treatment. Heat treatment did not reveal damage to the ray parenchymapit membranes, bordered pits and large window pit membranes; and the margo fibrils appeared withoutdamage. 2006 artículo científico 0717-3644 https://www.redalyc.org/articulo.oa?id=48580307 en http://www.redalyc.org/revista.oa?id=485 Maderas. Ciencia y Tecnología application/pdf Universidad del Bío Bío Maderas. Ciencia y Tecnología (Chile) Num.3 Vol.8 |
| format | Artículo científico |
| id | redalyc_48580307 |
| institution | Redalyc |
| language | en |
| publishDate | 2006 |
| publisher | Universidad del Bío Bío |
| spellingShingle | Microstructural and physical aspects of heat treated wood. Part 2. Hardwoods M.J. Boonstra Agrociencias hardwood microscopy heat treatment Wood modification Microstructural and physical aspects of heat treated wood. Part 2. Hardwoods M.J. Boonstra J.F. Rijsdijk C. Sander B. Tjeerdsma H. Militz J. van Acker M. Stevens E. Kegel Agrociencias hardwood microscopy heat treatment Wood modification Heat treatment of wood is an effective method to improve the dimensional stability and durabilityagainst 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 lightand scanning electron microscopic analysis. Hardwood species such as beech and poplar, werepredominantly sensitive to collaps of the vessels and some deformation of the libriform fibres directlynear the vessels. In treated beech and birch radial cracks were observed near the rays. Optimisation ofthe heat treatment process conditions including the application of a steam hydro thermolysis stage reducedsuch damages to a minimum. Broken cell walls perpendicular to the fibre direction resulting in transverseruptures has been noticed in heat treated hardwood species. This contributes to abrupt fractures oftreated wood as observed in bending tests which can lead to considerably different failure behavior afterimpact of mechanical stress. In some treated hardwood species maceration (small cracks betweentracheids) was noticed after heat treatment. Heat treatment did not reveal damage to the ray parenchymapit membranes, bordered pits and large window pit membranes; and the margo fibrils appeared withoutdamage. 2006 artículo científico 0717-3644 https://www.redalyc.org/articulo.oa?id=48580307 en http://www.redalyc.org/revista.oa?id=485 Maderas. Ciencia y Tecnología application/pdf Universidad del Bío Bío Maderas. Ciencia y Tecnología (Chile) Num.3 Vol.8 |
| title | Microstructural and physical aspects of heat treated wood. Part 2. Hardwoods |
| topic | Agrociencias hardwood microscopy heat treatment Wood modification |
| url | https://www.redalyc.org/articulo.oa?id=48580307 |