Microstructural and physical aspects of heat treated wood. Part 2. Hardwoods



Título del documento: Microstructural and physical aspects of heat treated wood. Part 2. Hardwoods
Revista: Maderas : ciencia y tecnología
Base de datos: PERIÓDICA
Número de sistema: 000274899
ISSN: 0718-221X
Autores: 1

2

3
4
5
Instituciones: 1Plato International, Arnhem. Holanda
2RINNTECH - Frank Rinn Engineering and Distribution, Heidelberg, Baden-Wurttemburg. Alemania
3SHR Hout Research, Wageningen, Gelderland. Holanda
4Georg-August-Universitat Gottingen, Gottingen, Niedersachsen. Alemania
5Ghent University, Laboratory of Wood Technology, Gante. Bélgica
Año:
Volumen: 8
Número: 3
Paginación: 209-218
País: Chile
Idioma: Inglés
Tipo de documento: Artículo
Enfoque: Experimental, analítico
Resumen en inglés 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
Disciplinas: Ingeniería,
Agrociencias,
Biología
Palabras clave: Ingeniería industrial,
Silvicultura,
Anatomía e histología,
Madera,
Secado,
Anatomía de la madera
Keyword: Engineering,
Agricultural sciences,
Biology,
Industrial engineering,
Silviculture,
Anatomy and histology,
Wood,
Drying,
Wood anatomy
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