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Nordic Pulp & Paper Research Journal

The international research journal on sustainable utilization of forest bioresources

Editor-in-Chief: Lindström, Tom


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Volume 34, Issue 2

Issues

Nano-lignocellulose from recycled fibres in coatings from aqueous and ethanolic media: effect of residual lignin on wetting and offset printing quality

Monireh Imani
  • Department of Pulp and Paper Technology, 123290 Gorgan University of Agricultural Sciences and Natural Resources, 4913815739 Gorgan, Iran
  • Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, PO Box 16300, FI-00076 Espoo, Finland
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/ Ali Ghasemian
  • Corresponding author
  • Department of Pulp and Paper Technology, 123290 Gorgan University of Agricultural Sciences and Natural Resources, 4913815739 Gorgan, Iran
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/ Mohammad Reza Dehghani-Firouzabadi
  • Department of Pulp and Paper Technology, 123290 Gorgan University of Agricultural Sciences and Natural Resources, 4913815739 Gorgan, Iran
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/ Elyas Afra
  • Department of Pulp and Paper Technology, 123290 Gorgan University of Agricultural Sciences and Natural Resources, 4913815739 Gorgan, Iran
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/ Patrick A. C. Gane
  • Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, PO Box 16300, FI-00076 Espoo, Finland
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/ Orlando J. Rojas
  • Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, PO Box 16300, FI-00076 Espoo, Finland
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Published Online: 2019-03-27 | DOI: https://doi.org/10.1515/npprj-2018-0053

Abstract

Nano-lignocellulose (NLC) and lignin-free nanocellulose (nano-holocellulose, NHC) were used in paper coating to investigate their effect on coating layer quality and offset printing. The NLC was produced by microfluidisation of unbleached secondary fibres while the reference NHC was obtained from the same fibre source after lignin removal (OHEPH bleaching), following the same mechanical process. TEMPO-mediated oxidation of the fibres prior to microfluidisation was applied to increase the electrostatic charge and hydrophilicity of the nanofibrils. The coatings, displaying given surface morphology and energy, were applied on Kraft, printing-grade papers at three grammage levels. The structure of the coated and uncoated (reference) papers were accessed (SEM and AFM) and IGT printing was carried out to determine the print density, print gloss, rub-off resistance, surface energy, roughness, ink transfer, dry pick resistance, water interference and set-off. The results highlight the important effect of residual lignin or type of nanocellulose on the coating layer and the development of offset printing properties. It was observed that roughness was a key factor leading to a deterioration of the print properties, predominantly affecting the NLC coating. Considering the lower hydrophilicity of NLC, an alternative dispersion with water-alcohol mixtures is proposed. By using this dispersing medium, tailorable surface coverage, surface smoothness, ink acceptance and improved printability was achieved. We show that under these conditions and compared to NHC, NLC is equally effective as a coating layer.

Keywords: coating; nano-holocellulose (NHC); nano-lignocellulose (NLC); offset printing; surface properties

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About the article

Received: 2018-09-05

Accepted: 2018-11-29

Published Online: 2019-03-27

Published in Print: 2019-05-26


Conflict of interest: The authors declare no conflicts of interest.


Citation Information: Nordic Pulp & Paper Research Journal, Volume 34, Issue 2, Pages 200–210, ISSN (Online) 2000-0669, ISSN (Print) 0283-2631, DOI: https://doi.org/10.1515/npprj-2018-0053.

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