Abstract
Measurements have been performed to clarify the connection between fibre–fibre joint properties and dimensional stability using laboratory sheets prepared from never-dried fibres, from heavily hornified fibres having a low molecular contact area between the fibres, and from both hornified and never-dried fibres treated with a polyelectrolyte multilayer (PEM) technique to increase the molecular contact area in the fibre–fibre joint. The influence of the drying mode, i.e. whether the sheets are dried freely or under restraint, was also evaluated. The results showed that neither paper strength nor fibre–fibre joint contact area had any significant influence on the dimensional stability of sheets dried under restraint. On the other hand, when the sheets were dried freely, the PEM-treated sheets expanded to the same extent as, or to an even greater extent than the non-PEM-treated sheets, even though they adsorbed less water for a given change in relative humidity. There was also a correlation between drying shrinkage and dimensional stability, where greater shrinkage was associated with a greater hygroexpansion in the freely dried sheets.
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Acknowledgments
BIM Kemi Sweden AB and the Knowledge Foundation through its graduate school YPK are acknowledged for financial support. STFI-Packforsk is acknowledged for granting access to their facilities and Sune Karlsson, STFI-Packforsk, and Jarmo Tulonen, TJT-Teknik AB, are thanked for helping with the dimensional stability equipment. Jarmo Tulonen is also acknowledged for substantially contributing to the design of the drying-frame. Mats Rundlöf, AB Capisco, is acknowledged for the aid with the fibre–fibre joint illustration.
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Larsson, P.A., Wågberg, L. Influence of fibre–fibre joint properties on the dimensional stability of paper. Cellulose 15, 515–525 (2008). https://doi.org/10.1007/s10570-008-9203-y
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DOI: https://doi.org/10.1007/s10570-008-9203-y