A micro-mechanical modelling study of drying restraint effects on the hygro-mechanics of paper sheets

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Abstract

In this contribution we show how fibre activation and micro-buckling of fibre walls may explain, quantitatively, differences in the hygro-mechanical response of paper sheets due to the presence or absence of mechanical restraint during their fabrication. To this end, both effects are incorporated in an idealised micro-mechanical model of the fibre network. The model is used to predict the response of the network to wetting-drying cycles, as a function of the degree of restraint during production. Restrained-dried networks are predicted to exhibit an irreversible hygroscopic strain upon first wetting and a different reversible hygro-expansivity coefficient, compared with freely-dried networks, which match well with experimental values reported in the literature.
Original languageEnglish
Title of host publicationAdvances in Pulp and Paper Research
Subtitle of host publicationTransactions of the 16th Fundamental Research Symposium, 3-8 September 2017, Oxford, United Kingdom
EditorsWarren Batchelor, Daniel Söderberg
Place of PublicationBury
PublisherPulp & Paper Fundamental Research Society (FRC)
Pages627-649
ISBN (Print)978-0-9926163-3-5
Publication statusPublished - Sep 2017

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