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<p>Barrier coatings play a crucial role in cellulose-based food packaging by preventing the ingress of oxygen, moisture, oils, and greases, thus preserving food quality. This research explored sustainable and cost-effective alternatives for these coatings, utilizing a mix of lamellar and spherical inorganic fillers like kaolin clay, calcium carbonate, and fumed silica in an aqueous polyvinyl alcohol solution with a glyoxal crosslinker. The coatings were assessed for oxygen transmission rate (OTR), water vapor transmission rate (WVTR), and oil resistance (KIT rating), alongside characterization techniques such as Fourier transform infrared (FTIR) spectroscopy, Brookfield viscometry, X-ray diffraction (XRD) analysis, and scanning electron microscopy (SEM). The XRD diffractogram was utilized to determine the orientation index and relate it to the barrier properties. The SEM analysis revealed the coating’s compactness and cracks, indicating tortuosity based on different filler combinations. Results showed excellent barrier properties with OTR = 5.6&#xa0;cc/m<sup>2</sup>/day and WVTR = 5.01&#xa0;g/m<sup>2</sup>/day for a 70:30 combination of K2/S1, alongside a KIT value of 11-12. These sustainable coatings, showcasing such impressive performance metrics, could be considered a viable option for commercial packaging applications.</p> Graphical abstract <p></p>

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Barrier performance of inorganic fillers in PVOH dispersion coatings for sustainable paper packaging

  • 期刊论文

  • 发表日期：

    2025年12月16日

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  • Simran Achrekar,
  • S. T. Mhaske

摘要

Barrier coatings play a crucial role in cellulose-based food packaging by preventing the ingress of oxygen, moisture, oils, and greases, thus preserving food quality. This research explored sustainable and cost-effective alternatives for these coatings, utilizing a mix of lamellar and spherical inorganic fillers like kaolin clay, calcium carbonate, and fumed silica in an aqueous polyvinyl alcohol solution with a glyoxal crosslinker. The coatings were assessed for oxygen transmission rate (OTR), water vapor transmission rate (WVTR), and oil resistance (KIT rating), alongside characterization techniques such as Fourier transform infrared (FTIR) spectroscopy, Brookfield viscometry, X-ray diffraction (XRD) analysis, and scanning electron microscopy (SEM). The XRD diffractogram was utilized to determine the orientation index and relate it to the barrier properties. The SEM analysis revealed the coating’s compactness and cracks, indicating tortuosity based on different filler combinations. Results showed excellent barrier properties with OTR = 5.6 cc/m2/day and WVTR = 5.01 g/m2/day for a 70:30 combination of K2/S1, alongside a KIT value of 11-12. These sustainable coatings, showcasing such impressive performance metrics, could be considered a viable option for commercial packaging applications.

Graphical abstract