Industrial Kiln Drying and its Effect on Microstructure, Impregnation and Properties of Scots Pine Timber Impregnated for Above Ground Use. Part 2. Effect of Drying on Microstructure and Some Mechanical Properties of Scots Pine Wood
-
Summary
Scots pine (Pinus sylvestris L.) planks were dried in industrial progressive, conventional batch and high temperature kilns. The timber was further impregnated in an industrial autoclave with three preservatives used for above ground use. Samples dried by the three test methods and control samples were thereafter processed for scanning electron microscopy observations. Small clear specimens were sawn for determination of impact bending strength, modulus of elasticity and rupture (MOE and MOR) and hardness. The high temperature dried wood (at 115 °C) was characterised by partially damaged apertures in some bordered pits and nano- (10–20 nm) and micro checks (1–2 μm) in the warty and S3 layers of the cell walls. It is probable that certain modifications in the structure of the wood polymer complex also occurred due to hemicellulose thermal degradation. The above-mentioned structural changes facilitated the penetration of the preservative during impregnation and its evacuation during the final stage of vacuum. The industrial progressive and conventional batch kiln drying had no visible effect on the microstructure of Scots pine wood. There was no critical reduction of the impact bending strength, hardness and MOE of the dried untreated wood regardless of the drying method. MOR was significantly decreased after the conventional kiln drying, but not following high temperature drying. Impregnation with Tanalith E and conventional batch kiln drying aggravated the MOE and MOR of the high temperature dried wood, but both MOE and MOR did not differ significantly from those of progressive and conventional batch kiln dried samples.
Copyright © 2002 by Walter de Gruyter GmbH & Co. KG
Articles in the same Issue
- Characteristics of Attack of Coastal Timbers by Pselactus spadix (Herbst) (Col.: Curc.: Cossoninae) and an Investigation of its Life History
- Bacterial Cellulose Production Using Monosaccharides Derived from Hemicelluloses in Water-Soluble Fraction of Waste Liquor from Atmospheric Acetic Acid Pulping
- Birch (Betula pendula) Wood Discolouration during Drying. Effect of Environmental Factors and Wood Location in the Trunk
- Immuno Electron Microscopic Localization of Peroxidases in the Differentiating Xylem of Populus spp.
- Vanilloyl Acetic Acid as an Unstable Intermediate from β-Hydroxypropiovanillone to Acetovanillone
- Study of Lewis Acid-Base Properties of Wood by Contact Angle Analysis
- Lipophilic Extractives of the Inner and Outer Barks of Eucalyptus globulus
- Thick-Target PIXE Analysis of Trace Elements in Wood Incoming to a Pulp Mill
- Formation of Aliphatic Carboxylic Acids during Soda-AQ Pulping of Kenaf Bark
- Comparing Mechanical Properties of Normal and Compression Wood in Norway Spruce: The Role of Lignin in Compression Parallel to the Grain
- Oxidative Ammonolysis of Technical Lignins. Part 3. Effect of Temperature on the Reaction Rate
- The Erythro/Threo Ratio of β-O-4 Structures as an Important Structural Characteristic of Lignin. Part 2. Changes in Erythro/Threo (E/T) Ratio of β-O-4 Structures during Delignification Reactions
- The Effect of HS- Ions in 1-mol/l NaOH Solutions on the Ion Diffusion in Wood Calculated as the Steady State Diffusion and the Drift Speed
- Industrial Kiln Drying and its Effect on Microstructure, Impregnation and Properties of Scots Pine Timber Impregnated for Above Ground Use. Part 1. Effects of Initial, Final Dryings and Preservative on Impregnation and Timber Quality
- Industrial Kiln Drying and its Effect on Microstructure, Impregnation and Properties of Scots Pine Timber Impregnated for Above Ground Use. Part 2. Effect of Drying on Microstructure and Some Mechanical Properties of Scots Pine Wood
- Study on Gypsum-Bonded Particleboard Reinforced with Jute Fibres
- Literature Reports
Articles in the same Issue
- Characteristics of Attack of Coastal Timbers by Pselactus spadix (Herbst) (Col.: Curc.: Cossoninae) and an Investigation of its Life History
- Bacterial Cellulose Production Using Monosaccharides Derived from Hemicelluloses in Water-Soluble Fraction of Waste Liquor from Atmospheric Acetic Acid Pulping
- Birch (Betula pendula) Wood Discolouration during Drying. Effect of Environmental Factors and Wood Location in the Trunk
- Immuno Electron Microscopic Localization of Peroxidases in the Differentiating Xylem of Populus spp.
- Vanilloyl Acetic Acid as an Unstable Intermediate from β-Hydroxypropiovanillone to Acetovanillone
- Study of Lewis Acid-Base Properties of Wood by Contact Angle Analysis
- Lipophilic Extractives of the Inner and Outer Barks of Eucalyptus globulus
- Thick-Target PIXE Analysis of Trace Elements in Wood Incoming to a Pulp Mill
- Formation of Aliphatic Carboxylic Acids during Soda-AQ Pulping of Kenaf Bark
- Comparing Mechanical Properties of Normal and Compression Wood in Norway Spruce: The Role of Lignin in Compression Parallel to the Grain
- Oxidative Ammonolysis of Technical Lignins. Part 3. Effect of Temperature on the Reaction Rate
- The Erythro/Threo Ratio of β-O-4 Structures as an Important Structural Characteristic of Lignin. Part 2. Changes in Erythro/Threo (E/T) Ratio of β-O-4 Structures during Delignification Reactions
- The Effect of HS- Ions in 1-mol/l NaOH Solutions on the Ion Diffusion in Wood Calculated as the Steady State Diffusion and the Drift Speed
- Industrial Kiln Drying and its Effect on Microstructure, Impregnation and Properties of Scots Pine Timber Impregnated for Above Ground Use. Part 1. Effects of Initial, Final Dryings and Preservative on Impregnation and Timber Quality
- Industrial Kiln Drying and its Effect on Microstructure, Impregnation and Properties of Scots Pine Timber Impregnated for Above Ground Use. Part 2. Effect of Drying on Microstructure and Some Mechanical Properties of Scots Pine Wood
- Study on Gypsum-Bonded Particleboard Reinforced with Jute Fibres
- Literature Reports
