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Paper Chemistry pp 76–96Cite as

Wet-strength chemistry

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Abstract

Paper is a layered mat consisting of a network of cellulose fibres bonded together. Each of the fibre-fibre contacts is held together by intermolecular forces (van der Waals; hydrogen bonding) which are very sensitive to water, the extent of bonding decreasing steadily as the water content of the paper increases [1], The water wets the fibres which swell; the bonds are broken leaving somewhere between 3% and 10% of the original dry strength (at 50% relative humidity). It is thought that some of this residual strength results from covalent fibre-fibre bonds [2,3]. Apart from the influence of the physical properties of the fibre network, the strength of the paper matrix is dependent on the bonded area, and this can be increased by forcing the surfaces together as in wet pressing, or by increasing fibre flexibility and swelling. Other solvents also affect strength, and their effects are essentially related to their ability to swell cellulose [4–6].

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Authors
  1. N. Dunlop-Jones
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Editors and Affiliations

  1. Department of Paper Science, University of Manchester Institute of Science and Technology, UK

    J. C. Roberts (Head) (Head)

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© 1991 Blackie & Son Ltd

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Dunlop-Jones, N. (1991). Wet-strength chemistry. In: Roberts, J.C. (eds) Paper Chemistry. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-6474-0_6

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  • DOI: https://doi.org/10.1007/978-94-011-6474-0_6

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-011-6476-4

  • Online ISBN: 978-94-011-6474-0

  • eBook Packages: Springer Book Archive

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