Comparison between HT-dried and LT-dried spruce timber in terms of shape and dimensional stability
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Robert Kliger
Abstract
The performance of timber studs from Norway spruce (Picea abies) in terms of shape and dimensional stability was evaluated. The shape stability studied included three modes of distortion, i.e. twist, bow and spring. The dimensional stability was assessed by measuring longitudinal shrinkage and swelling properties. The study comprised 96 studs measuring 45 mm×70 mm×2500 mm from 15 butt logs. Half the studs from each log were dried using a high-temperature method (HT) at 115°C, while the other half were dried using a conventional low-temperature method (LT) at 70°C. Distortion in the studs was measured at moisture contents of 14% and 9%. The HT-dried timber had significantly lower distortion values than the LT-dried timber. As a result, 80% of the high-temperature-dried studs were able to pass the limits for distortion, while only 60% of the low-temperature-dried studs passed the same limit. Studs cut close to the pith displayed the largest twist, independent of the drying method. A simple model for predicting twist that was used in previous studies was also valid for HT-dried timber. The most important parameters in this model for both HT- and LT-dried timber were grain angle, annual ring curvature and tangential shrinkage.
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©2005 by Walter de Gruyter Berlin New York
Articles in the same Issue
- Contents
- Species index (scientific names)
- Subject Index
- Acknowledgement
- Author Index
- Ultrastructural changes in a holocellulose pulp revealed by enzymes, thermoporosimetry and atomic force microscopy
- Development of wet strength additives from wheat gluten
- Characterization of electrolyzed magnesium spent-sulfite liquor
- Molecular weight-functional group relations in softwood residual kraft lignins
- Structure-activity relationships of cadinane-type sesquiterpene derivatives against wood-decay fungi
- Effect of water on wood liquefaction and the properties of phenolated wood
- Effect of wood species and molecular weight of phenolic resins on curing behavior and bonding development
- Contact-free measurement and non-linear finite element analyses of strain distribution along wood adhesive bonds
- Comparison between HT-dried and LT-dried spruce timber in terms of shape and dimensional stability
- Physical properties of earlywood and latewood of Pinus radiata D. Don: Anisotropic shrinkage, equilibrium moisture content and fibre saturation point
- Effect of stress levels on compressive low-cycle fatigue behaviour of softwood
- Comparison of morphological and chemical properties between juvenile wood and compression wood of loblolly pine
- Ultrastructure of commercial recycled pulp fibers for the production of packaging paper
- Oxalate regulation by two brown rot fungi decaying oxalate-amended and non-amended wood
- Pine and spruce roundwood species classification using multivariate image analysis on bark
- Detection and species discrimination using rDNA T-RFLP for identification of wood decay fungi
- Personalia
- Award presentation on the occasion of the 13th International Symposium on Wood, Fibre and Pulping Chemistry, May 16–19, 2005, Auckland, New Zealand
- NMR studies on Fraser fir Abies fraseri (Pursh) Poir. Lignins
Articles in the same Issue
- Contents
- Species index (scientific names)
- Subject Index
- Acknowledgement
- Author Index
- Ultrastructural changes in a holocellulose pulp revealed by enzymes, thermoporosimetry and atomic force microscopy
- Development of wet strength additives from wheat gluten
- Characterization of electrolyzed magnesium spent-sulfite liquor
- Molecular weight-functional group relations in softwood residual kraft lignins
- Structure-activity relationships of cadinane-type sesquiterpene derivatives against wood-decay fungi
- Effect of water on wood liquefaction and the properties of phenolated wood
- Effect of wood species and molecular weight of phenolic resins on curing behavior and bonding development
- Contact-free measurement and non-linear finite element analyses of strain distribution along wood adhesive bonds
- Comparison between HT-dried and LT-dried spruce timber in terms of shape and dimensional stability
- Physical properties of earlywood and latewood of Pinus radiata D. Don: Anisotropic shrinkage, equilibrium moisture content and fibre saturation point
- Effect of stress levels on compressive low-cycle fatigue behaviour of softwood
- Comparison of morphological and chemical properties between juvenile wood and compression wood of loblolly pine
- Ultrastructure of commercial recycled pulp fibers for the production of packaging paper
- Oxalate regulation by two brown rot fungi decaying oxalate-amended and non-amended wood
- Pine and spruce roundwood species classification using multivariate image analysis on bark
- Detection and species discrimination using rDNA T-RFLP for identification of wood decay fungi
- Personalia
- Award presentation on the occasion of the 13th International Symposium on Wood, Fibre and Pulping Chemistry, May 16–19, 2005, Auckland, New Zealand
- NMR studies on Fraser fir Abies fraseri (Pursh) Poir. Lignins
