Unbleached Nanofibrillated Cellulose as Additive and Coating for Kraft Paper

Although paper packages are biodegradable, their applications in food packaging are limited due to high affinity for absorbing moisture and the high permeability of gases and liquids with surroundings. Therefore, exploring the use biodegradable coatings such as nanocellulose to improve barrier is a...

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Bibliographic Details
Published in:Coatings (Basel) 2024-08, Vol.14 (8), p.962
Main Authors: Lengowski, Elaine Cristina, Bonfatti Júnior, Eraldo Antonio, Simon, Leonardo Coelho, Izidio, Vitória Maria Costa, Andrade, Alan Sulato de, Nisgoski, Silvana, Muniz, Graciela Inês Bolzon de
Format: Article
Language:English
Subjects:
Bursting
Bursting strength
Cellulose
Coatings
Energy consumption
Eucalyptus
Food
Food packaging
Lignin
Manufacturing
Mechanical properties
Microscopy
Morphology
Nanomaterials
Packaging
Permeability
Temperature
Tensile strength
Thermal stability
Thickness
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Summary:Although paper packages are biodegradable, their applications in food packaging are limited due to high affinity for absorbing moisture and the high permeability of gases and liquids with surroundings. Therefore, exploring the use biodegradable coatings such as nanocellulose to improve barrier is a relevant strategy. This study assessed the efficacy of unbleached nanofibrillated cellulose (NFC) as an additive to paper and coatings. Using NFC derived from unbleached eucalyptus pulp, a 5% mass addition to the paper pulp and a 2 mm wet nanocellulose coating to kraft paper handsheets made from pine pulp were investigated. In addition, nanocellulose films of similar thicknesses were appraised. The physical, morphological, mechanical, and thermal characteristics of the resulting papers were assessed. Incorporating NFC notably enhanced the morphology area of the paper by padding its pores, thus increasing its density by up to 48% and improving its water barrier properties by up to 50%. The mechanical strength showed significant enhancements, particularly in bursting and tensile strength with increases of up to 134% and 50%, respectively. Anyhow, the films exhibited lower bursting indices and no improvement in the tearing index. Nonetheless, the thermal stability of the handsheets with NFC coating meets the minimum requirements for food packaging.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings14080962