Viscoelastic Behaviour of Wood Fibres during the Hot Pressing of Medium Density Fibreboard
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J. van Houts
Summary
Sufficient stress relaxation within a medium density fibreboard (MDF) mat during hot pressing is critical for producing a panel with acceptable mechanical properties and dimensional stability. This paper describes a series of load relaxation tests of wood fibres conducted at temperatures and moisture contents similar to those within an MDF mat during the hot pressing process (temperatures ranging from 80°C to 100°C with relative humidity levels ranging from 9% to 68%). The results clearly show an increase in relaxation when either the temperature or relative humidity is increased. The relaxation behaviour of MDF is also measured and the trends observed are comparable to those of the wood fibres. Taguchi experimental design is employed to analyse the effects of temperature, moisture content and initial stress on the viscoelastic behaviour of MDF.
Copyright © 2003 by Walter de Gruyter GmbH & Co. KG
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- Topochemical Characterisation of Phenolic Extractives in Discoloured Beechwood (Fagus sylvatica L.)
- Detection and Species Identification of Wood-Decaying Fungi by Hybridization of Immobilized Sequence-Specific Oligonucleotide Probes with PCR-Amplified Fungal Ribosomal DNA Internal Transcribed Spacers
- Analysis of Protein Expression along the Normal to Tension Wood Gradient in Eucalyptus gunnii
- Phenolic and Lipophilic Extractives in Scots Pine Knots and Stemwood
- Chemical Characterisation of Wood of Roman Ships Brought to Light in the Recently Discovered Ancient Harbour of Pisa (Tuscany, Italy)
- Lignin Structures in Normal and Compression Wood. Evaluation by Thioacidolysis Using Ethanethiol and Methanethiol
- Lignin-Carbohydrate Condensation Product Formation in a Biomimetic Model Pulp Bleaching System
- Viscoelastic Behaviour of Wood Fibres during the Hot Pressing of Medium Density Fibreboard
- Measuring Relative Fibre Length in Scots Pine by Non-Destructive Wood Sampling
- Modelling Log-End Cracks Due to Growth Stresses: Calculation of the Elastic Energy Release Rate
- Modeling Ovendry Softwood Resistivity Based on the Resistor Network Theory
- Comparison of the TL-Shear Strength of Normal and Compression Wood of European Larch
- A Theoretical Analysis of Timber Drying in Oscillating Climates
- Comparing the Effect of Chemical and Physical Properties on Complex Electrical Impedance of Scots Pine Wood
- Wood-Derived Porous Ceramics via Infiltration of SiO2-Sol and Carbothermal Reduction
- Manufacture of Fiberboard from Wood Fibers Activated with Fentons Reagent (H2O2/FeSO4)
