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Effects of Thermo-Hydro-Mechanical Treatment on the Structure and Properties of Wood
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Parviz Navi
Veröffentlicht/Copyright:
1. Juni 2005
Summary
A process has been developed for densifying wood by thermo-hydro-mechanical (THM) means. The resulting product is then called THM densified wood. Small specimens of different wood species, with or without knots, were densified in their radial, tangential and transversal directions. Tests on THM densified wood show significant improvement in mechanical properties. THM densified wood is less hygroscopic and more stable, with almost no shape memory. We have shown that the shear strength of wood in its grain direction increases more than tenfold by THM treatment. This article gives testing results and micrographs of THM densified wood, and discusses the physical nature of different mechanisms intervening at the wood cell wall level during the thermo-hydro-mechanical process.
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Published Online: 2005-06-01
Published in Print: 2000-04-13
Copyright © 2000 by Walter de Gruyter GmbH & Co. KG
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- Molecular Methods for the Characterization and Identification of the Dry Rot Fungus Serpula lacrymans
- Use of Soft Rot Fungi for Studies on the Microstructure of Kapok (Ceiba pentandra (L.) Gaertn.) Fibre Cell Walls
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- Influence of Botanical Species and Geographical Origin on the Content of Low Molecular Weight Phenolic Compounds of Woods Used in Portuguese Cooperage
- Effect of Oxygen Pressure on the Oxidation of Syringyl Alcohol Initiated by Manganese(III) Acetate
- Potential Catalysts for the Acetylation of Wood
- Quantification of Muconic Acid-Type Structures in High Molecular Weight Material from Bleach Plant Effluents
- The Effects of the Order of Chemical Addition on the Peroxide Bleaching of an Oxygen-Delignified Softwood Kraft Pulp
- Effects of Thermo-Hydro-Mechanical Treatment on the Structure and Properties of Wood
- Improvement of Heartwood Color of Black-Colored Sugi (Cryptomeria japonica D. Don) by UV Irradiation after Smoke Heating
- Analysis of the Wood Sorption Isotherm Using the Theory of Micropore Volume Filling
- Acoustic Emission Generated upon Mechano-Sorptive Creep of Wood Bent Across to the Grain under Asymmetrical Moistening
- Experimental Data Correction of the Dynamic Elastic Moduli, Velocity and Density of Solid Wood as a Function of Moisture Content above the Fiber Saturation Point
- Contractive Force and Transformation of Microfibril with Aqueous Sodium Hydroxide Solution for Wood
- Dielectric Relaxation Based on Adsorbed Water in Wood Cell Wall under Non-Equilibrium State. 1
- Stabilizing Effect of Chromated Salt Treatment on the Green Color of Ma Bamboo (Dendrocalamus latiflorus)
- Microwave-Enhanced Transport of Chemicals into Green Wood under Low-Headspace Conditions
- Personalia: Günther Stegmann in memoriam
Artikel in diesem Heft
- Molecular Methods for the Characterization and Identification of the Dry Rot Fungus Serpula lacrymans
- Use of Soft Rot Fungi for Studies on the Microstructure of Kapok (Ceiba pentandra (L.) Gaertn.) Fibre Cell Walls
- Ultrastructural Changes in the Compound Middle Lamella of Pinus thunbergii During Lignification and Lignin Removal
- Comparison of the Antifungal Activity of Cadinane Skeletal Sesquiterpenoids from Taiwania (Taiwania cryptomerioides Hayata) Heartwood
- Characterization of the Polyphenolics Related to the Colour of Western Red Cedar (Thuja plicata Donn) Heartwood
- Influence of Botanical Species and Geographical Origin on the Content of Low Molecular Weight Phenolic Compounds of Woods Used in Portuguese Cooperage
- Effect of Oxygen Pressure on the Oxidation of Syringyl Alcohol Initiated by Manganese(III) Acetate
- Potential Catalysts for the Acetylation of Wood
- Quantification of Muconic Acid-Type Structures in High Molecular Weight Material from Bleach Plant Effluents
- The Effects of the Order of Chemical Addition on the Peroxide Bleaching of an Oxygen-Delignified Softwood Kraft Pulp
- Effects of Thermo-Hydro-Mechanical Treatment on the Structure and Properties of Wood
- Improvement of Heartwood Color of Black-Colored Sugi (Cryptomeria japonica D. Don) by UV Irradiation after Smoke Heating
- Analysis of the Wood Sorption Isotherm Using the Theory of Micropore Volume Filling
- Acoustic Emission Generated upon Mechano-Sorptive Creep of Wood Bent Across to the Grain under Asymmetrical Moistening
- Experimental Data Correction of the Dynamic Elastic Moduli, Velocity and Density of Solid Wood as a Function of Moisture Content above the Fiber Saturation Point
- Contractive Force and Transformation of Microfibril with Aqueous Sodium Hydroxide Solution for Wood
- Dielectric Relaxation Based on Adsorbed Water in Wood Cell Wall under Non-Equilibrium State. 1
- Stabilizing Effect of Chromated Salt Treatment on the Green Color of Ma Bamboo (Dendrocalamus latiflorus)
- Microwave-Enhanced Transport of Chemicals into Green Wood under Low-Headspace Conditions
- Personalia: Günther Stegmann in memoriam
