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<p>Cellulose nanofibrils (CNFs) offer impressive barriers against oil, grease, and gas when applied as a layer on paper or as a standalone film; however, coating CNFs onto paper with conventional equipment at useful coat weights in a single step is not currently possible. Here, we present a method to coat CNFs onto paper using an easily scalable vacuum-assisted approach which removes the water-rich layer that forms at the interface during the coating process. With the water layer removed, coat weights of 12–28&#xa0;g CNFs/m<sup>2</sup> are achievable in a single step, depending on parameters including vacuum strength and initial cellulose concentration. The CNF-coated paper was found to nearly eliminate air permeability, reduce water uptake, and provide a high degree of resistance to oil, even after folding. This work opens the door for industrial-scale manufacture of CNF coated paper that can displace plastics in some food packaging applications.</p> Graphical abstract <p></p>

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Single-step coating of cellulose nanofibrils on paper for sustainable food packaging

  • 期刊论文

  • 发表日期：

    2025年11月7日

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  • Sandro Zier,
  • Zechariah Hoeft,
  • John P. W. Quinn,
  • Amir Kordijazi,
  • Caitlin Howell,
  • Douglas Bousfield

摘要

Cellulose nanofibrils (CNFs) offer impressive barriers against oil, grease, and gas when applied as a layer on paper or as a standalone film; however, coating CNFs onto paper with conventional equipment at useful coat weights in a single step is not currently possible. Here, we present a method to coat CNFs onto paper using an easily scalable vacuum-assisted approach which removes the water-rich layer that forms at the interface during the coating process. With the water layer removed, coat weights of 12–28 g CNFs/m2 are achievable in a single step, depending on parameters including vacuum strength and initial cellulose concentration. The CNF-coated paper was found to nearly eliminate air permeability, reduce water uptake, and provide a high degree of resistance to oil, even after folding. This work opens the door for industrial-scale manufacture of CNF coated paper that can displace plastics in some food packaging applications.

Graphical abstract