A hygroexpansimeter, cockling tester and a novel x-ray microtomography technique were employed to characterize hygroexpansivity as well as macro- and micro-scale cockling of wood-free paper sheets containing varying amounts of aspen high yield pulp (HYP) in order to validate its potential applicability in inkjet printing. Results from the hygroexpansimeter confirm previous findings that substitution levels of 30% and above lead to a slight deterioration of hygroexpansivity; however, contrary to the expected outcome, aspen HYP did not necessarily result in a higher tendency to form cockles. In fact, a comparison of the cockling behaviour between various paper samples and commercial paper substantiates that up to 40% of aspen HYP can replace hardwood bleached Kraft pulp. The preservation of out-of-plane dimensional stability in non-coated samples is most likely due to the increase in bending stiffness of the paper as it became bulkier with more aspen HYP.
| Identifer | oai:union.ndltd.org:TORONTO/oai:tspace.library.utoronto.ca:1807/29493 |
| Date | 11 August 2011 |
| Creators | Barquin, Adrew |
| Contributors | Kortschot, Mark Timothy, Yan, Ning |
| Source Sets | University of Toronto |
| Language | en_ca |
| Detected Language | English |
| Type | Thesis |
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