The effects of polystyrene beads and nylon fibres on the permeability of compressed wood fibre pads

Authors

  • A. K. T. Chan,

    1. McMaster Centre for Pulp and Paper Research, Department of Chemical Engineering, McMaster University, Hamilton, Ontario L8S 4L7
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  • R. H. Pelton,

    Corresponding author
    1. McMaster Centre for Pulp and Paper Research, Department of Chemical Engineering, McMaster University, Hamilton, Ontario L8S 4L7
    • McMaster Centre for Pulp and Paper Research, Department of Chemical Engineering, McMaster University, Hamilton, Ontario L8S 4L7
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  • S. Zhu,

    1. McMaster Centre for Pulp and Paper Research, Department of Chemical Engineering, McMaster University, Hamilton, Ontario L8S 4L7
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  • M. H. I. Baird

    1. McMaster Centre for Pulp and Paper Research, Department of Chemical Engineering, McMaster University, Hamilton, Ontario L8S 4L7
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Abstract

The influence of polystyrene beads (80 μm) and nylon fibres on the water permeability of bleached kraft wood pulp fibre pads was measured and the results were regressed to the Kozeny-Carman equation. SEM micrographs of pad cross sections showed that the beads, which were uniformly distributed, had little effect on pad structure whereas the long rigid nylon fibres made the pads more difficult to compress.

The pad specific surface areas and swollen volumes were linear functions of the content of beads or nylon fibres. This suggests that the fibre pad permeability characteristics could be adequately modeled from the linear superposition of geometric properties of the pad constituents.

Abstract

L'influence des billes de polystyrène (80 μm) et des fibres de nylon sur la perméabilité à l'eau de tampons de fibre de pǎte à papier Kraft blanchie a été mesurée, et les résultats sont traités avec l'équation de Kozeny-Carman. Des micrographies SEM (microscopie électronique à balayage) de sections transversales des tampons montrent que les billes, qui sont uniformément distribuées, ont peu d'effet sur la structure des tampons, alors que les fibres de nylon rigides longues rendent les tampons plus difficiles à comprimer.

La surface spécifique des tampons et les volumes gonflés sont des fonctions linéaires de la teneur en billes ou en fibres de nylon. Ceci suggère que les caractéristiques de perméabilité des tampons de fibres pourrait ětre adéquatement modélisées par la superposition linéaire des propriétés géométriques des constituants des tampons.

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