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Microstructural and physical aspects of heat treated wood, part 2: hardwoods

(2006) MADERAS. CIENCIA Y TECNOLOGIA. 8(3). p.209-218
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Abstract
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.
Keywords
Wood modification, microscopy, hardwood, heat treatment

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Chicago
Boonstra, Michiel J, JF Rijsdijk, C Sander, Edo V Kegel, B Tjeerdsma, Holger Militz, Joris Van Acker, and Marc Stevens. 2006. “Microstructural and Physical Aspects of Heat Treated Wood, Part 2: Hardwoods.” Maderas. Ciencia Y Tecnologia 8 (3): 209–218.
APA
Boonstra, Michiel J, Rijsdijk, J., Sander, C., Kegel, E. V., Tjeerdsma, B., Militz, H., Van Acker, J., et al. (2006). Microstructural and physical aspects of heat treated wood, part 2: hardwoods. MADERAS. CIENCIA Y TECNOLOGIA, 8(3), 209–218.
Vancouver
1.
Boonstra MJ, Rijsdijk J, Sander C, Kegel EV, Tjeerdsma B, Militz H, et al. Microstructural and physical aspects of heat treated wood, part 2: hardwoods. MADERAS. CIENCIA Y TECNOLOGIA. 2006;8(3):209–18.
MLA
Boonstra, Michiel J, JF Rijsdijk, C Sander, et al. “Microstructural and Physical Aspects of Heat Treated Wood, Part 2: Hardwoods.” MADERAS. CIENCIA Y TECNOLOGIA 8.3 (2006): 209–218. Print.
@article{852675,
  abstract     = {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 ({\textlangle}200{\textdegree}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, Michiel J and Rijsdijk, JF and Sander, C and Kegel, Edo V and Tjeerdsma, B and Militz, Holger and Van Acker, Joris and Stevens, Marc},
  issn         = {0718-221X},
  journal      = {MADERAS. CIENCIA Y TECNOLOGIA},
  keyword      = {Wood modification,microscopy,hardwood,heat treatment},
  language     = {eng},
  number       = {3},
  pages        = {209--218},
  title        = {Microstructural and physical aspects of heat treated wood, part 2: hardwoods},
  url          = {http://dx.doi.org/10.4067/S0718-221X2006000300007},
  volume       = {8},
  year         = {2006},
}

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