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Coatability of cellulose nanofibril suspensions: Role of rheology and water retention
Åbo Akademi University, Finland.
NTNU, Norway.
RISE - Research Institutes of Sweden, Bioeconomy, PFI.ORCID iD: 0000-0003-2271-3637
NTNU, Norway.
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2017 (English)In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 12, no 4, p. 7656-7679Article in journal (Refereed) Published
Abstract [en]

Cellulose nanofibril (CNF) suspensions are not easily coatable because of their excessively high viscosity and yield stress, even at low solids concentrations. In addition, CNF suspensions vary widely in their properties depending on the production process used, which can affect their processability. This work reports roll-to-roll coating of three different types of CNF suspensions with a slot-die, and the influence of rheology and water retention on coatability is addressed. The impact of CMC addition on the high and low shear rate rheology, water retention, coatability, and final coating quality of these suspensions is reported. All three CNF suspensions were coated successfully using the slot-die coating process. CMC addition further improved the coatability by positively influencing both the low and high shear rate viscosity and water retention of the CNF suspensions. All CNF coatings significantly improved the air, heptane vapor, grease and oil barrier, while reducing the water vapor transmission rate to some extent.

Place, publisher, year, edition, pages
North Carolina State University , 2017. Vol. 12, no 4, p. 7656-7679
Keywords [en]
Cellulose, Coatings, Elasticity, Nanofibers, Rolls, Shear deformation, Viscosity, Yield stress, Cellulose nanofibrils, High shear rate, Roll to Roll, Slot dies, Water retention, Suspensions
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-32701DOI: 10.15376/biores.12.4.7656-7679Scopus ID: 2-s2.0-85032658051OAI: oai:DiVA.org:ri-32701DiVA, id: diva2:1161936
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Available from: 2017-12-01 Created: 2017-12-01 Last updated: 2018-07-20Bibliographically approved

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Syverud, Kristin

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