Coatability of cellulose nanofibril suspensions: Role of rheology and water retention

V. Kumar (Corresponding Author), Vegar Ottesen, Kristin Syverud, Øyvind Weiby Gregersen, Martti Toivakka

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)

Abstract

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.
Original languageEnglish
Pages (from-to)7656–7679
Number of pages24
JournalBioResources
Volume12
Issue number4
Publication statusPublished - 2017
MoE publication typeA1 Journal article-refereed

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