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.
|Titel||Advances in Pulp and Paper Research|
|Subtitel||Transactions of the 16th Fundamental Research Symposium, 3-8 September 2017, Oxford, United Kingdom|
|Redacteuren||Warren Batchelor, Daniel Söderberg|
|Plaats van productie||Bury|
|Uitgeverij||Pulp & Paper Fundamental Research Society (FRC)|
|ISBN van geprinte versie||978-0-9926163-3-5|
|Status||Gepubliceerd - sep 2017|