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Continuous roll-to-roll coating of cellulose nanocrystals onto paperboard
Åbo Akademi University, Finland.
RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation.
Åbo Akademi University, Finland.
Åbo Akademi University, Finland.
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2018 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 25, no 10, p. 6055-6069Article in journal (Refereed) Published
Abstract [en]

There is an increased interest in the use of cellulose nanocrystal (CNC) films and coatings for a range of functional applications in the fields of material science, biomedical engineering, and pharmaceutical sciences. Most of these applications have been demonstrated on films and coatings produced using laboratory-scale batch processes, such as solvent casting, dip coating, or spin coating. For successful coating application of CNC suspensions using a high throughput process, several challenges need to be addressed: relatively high viscosity at low solids content, coating brittleness, and potentially poor adhesion to the substrate. This work aims to address these problems. The impact of plasticizer on suspension rheology, coating adhesion, and barrier properties was quantified, and the effect of different pre-coatings on the wettability and adhesion of CNC coatings to paperboard substrates was explored. CNC suspensions were coated onto pre-coated paperboard in a roll-to-roll process using a custom-built slot die. The addition of sorbitol reduced the brittleness of the CNC coatings, and a thin cationic starch pre-coating improved their adhesion to the paperboard. The final coat weight, dry coating thickness, and coating line speed were varied between 1–11 g/m2, 900 nm–7 µm, and 2.5–10 m/min, respectively. The barrier properties, adhesive strength, coating coverage, and smoothness of the CNC coatings were characterized. SEM images show full coating coverage at coat weights as low as 1.5 g/m2. With sorbitol as plasticizer and at coat weights above 3.5 g/m2, heptane vapor and water vapor transmission rates were reduced by as much as 99% and 75% respectively. Compared to other film casting techniques, the process employed in this work deposits a relatively thick coating in significantly less time, and may therefore pave the way toward various functional applications based on CNCs.

Place, publisher, year, edition, pages
2018. Vol. 25, no 10, p. 6055-6069
Keywords [en]
Barrier films, Barrier properties, Cellulose nanocrystals (CNCs), Roll-to-roll coating, Slot coating, Sorbitol plasticizer, Adhesion, Alcohols, Batch data processing, Biomedical engineering, Brittleness, Cellulose, Cellulose derivatives, Cellulose films, Fracture mechanics, Nanocrystals, Paperboards, Plasticity, Plasticizers, Reinforced plastics, Rolls (machine components), Substrates, Suspensions (fluids), Thickness measurement, Cellulose nano-crystals, Cellulose nanocrystal (CNC), Cellulose nanocrystal (CNCs), Functional applications, Roll to Roll, Water vapor transmission rate, Coatings
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-34488DOI: 10.1007/s10570-018-1958-1Scopus ID: 2-s2.0-85050341471OAI: oai:DiVA.org:ri-34488DiVA, id: diva2:1237317
Available from: 2018-08-08 Created: 2018-08-08 Last updated: 2018-12-12Bibliographically approved

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Swerin, Agne

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