Abstract
Internal sizing is achieved by retarding the rate of penetration of a fluid, usually water, through capillaries formed both within and between fibres. The rate of capillary rise of fluids into paper has been effectively described by the Washburn equation [1] and modifications of it [2]. These approaches assume that the penetration of a fluid into paper is analogous to that of a fluid into a single capillary. Retardation is thus brought about by the creation of a low energy hydrophobic surface at the fibre-water interface which increases the contact angle formed between a drop of liquid and the surface and thus decreases the wettability. Contact angles have been shown to be sensitive to molecular packing, surface morphology and chemical constitution [3–5], and it is the latter which is influenced during the internal sizing of paper. An excellent review is available [6] and this subject is also discussed more fully in Chapter 7.
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Roberts, J.C. (1991). Neutral and alkaline sizing. In: Roberts, J.C. (eds) Paper Chemistry. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-6474-0_8
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DOI: https://doi.org/10.1007/978-94-011-6474-0_8
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