Slot Coating of Nanocellulose on Paperboard, PaperCon2017

Replacement of oil-based materials with those produced from renewable material sources has attracted considerable interest in recent years. An example is use of bio-based barriers in food packaging. One candidate material for renewable barrier applications is nanocellulose, which has been found to possess excellent impermeability, especially against grease, oils and oxygen. Numerous reviews (Abitbol et al. 2016; Brodin et al. 2014; Dufresne 2013, Eichhorn et al. 2010; Isogai et al. 2011; Isogai 2013; Klemm et al. 2011; Lavoine et al. 2012; Lindström et al. 2015; Moon et al. 2011; Osong et al. 2015; Plackett et al. 2014; Siró and Plackett 2010) and book chapters (Aspler et al. 2013; Bardet and Bras 2014; Habibi and Lucia 2012; Naderi and Lindström 2015) have covered various fundamental aspects of nanocellulose manufacturing and properties. However, most of the research related to potential future applications that has been presented so far is based on small, batch-produced free-standing films of nanocellulose. Reports on continuous processing into films or coatings, which is required for large-scale and low cost production, are few. Similarly, high deformation rate rheology of nanocellulose, which is relevant for high speed coating operations, has not received much attention. The current work aims at understanding cellulose nanofiber (CNF) suspension rheology at high shear rates and demonstrates roll-to-roll coating of CNF on paperboard with slot die geometry. Barrier properties of the CNF-coated paperboard, including oil, grease, water and heptane vapor barrier are reported to illustrate potential future applications.

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