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Characterisation of wood–water relationships and transverse anatomy and their relationship to drying degrade

Redman, Adam L. and Bailleres, Henri and Turner, Ian and Perré, Patrick (2016) Characterisation of wood–water relationships and transverse anatomy and their relationship to drying degrade. Wood Science and Technology . ISSN 0043-7719

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Article Link(s): http://dx.doi.org/10.1007/s00226-016-0818-0

Abstract

Characterisation of a number of key wood properties utilising ‘state of the art’ tools was achieved for four commercial Australian hardwood species: Corymbia citriodora, Eucalyptus pilularis, Eucalyptus marginata and Eucalyptus obliqua. The wood properties were measured for input into microscopic (cellular level) and macroscopic (board level) vacuum drying models currently under development. Morphological characterisation was completed using a combination of ESEM, optical microscopy and a custom vector-based image analysis software. A clear difference in wood porosity, size, wall thickness and orientation was evident between species. Wood porosity was measured using a combination of fibre and vessel porosity. A highly sensitive microbalance and scanning laser micrometres were used to measure loss of moisture content in conjunction with directional shrinkage on micro-samples of E. obliqua to investigate the validity of measuring collapse-free shrinkage in very thin sections. Collapse-free shrinkage was characterised, and collapse propensity was verified when testing thicker samples. Desorption isotherms were calculated for each species using wood–water relations data generated from shrinkage experiments. Fibre geometry and wood shrinkage anisotropy were used to explain the observed difficulty in drying of the different species in terms of collapse and drying stress-related degrade.

Item Type:Article
Business groups:Horticulture and Forestry Science
Keywords:Fibre Cell Wall Cell Wall Thickness Ray Parenchyma Cell Equilibrium Moisture Content Shrinkage Tangential Shrinkage Dew Point Temperature Surface Check Wood Fibre Porosity Dry Bulb Temperature Wood Property Compressive Strength Water Content Oven-dry Density
Subjects:Forestry > Research. Experimentation
Forestry > Exploitation and utilization
Deposited On:04 Apr 2016 00:07
Last Modified:04 Apr 2016 00:07

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