NEAR INFRARED SPECTROSCOPY FOR ESTIMATING PROPERTIES OF KRAFT PAPER REINFORCED WITH CELLULOSE NANOFIBRILS

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Lidiane Costa Lima
Lívia Ribeiro Costa
https://orcid.org/0000-0003-0086-731X
Ana Márcia Macedo Ladeira Carvalho
https://orcid.org/0000-0002-5883-8987
Maria Lucia Bianchi
Paulo Ricardo Gherardi Hein
https://orcid.org/0000-0002-9152-6803

Abstract

Background: The aim of this study was to investigate near infrared (NIR) spectroscopy ability to estimate nanofibril concentration, physical and mechanical properties of Kraft paper reinforced with cellulose nanofibrils (CNF).


Results: principal component analysis (PCA) revealed no separation among specimens related to nanofibril content. Partial least squares regression (PLS-R) models for estimating nanofibril content, tensile index, stretch and resistance to air passage yielded R²cv ranging from 0.73 to 0.98. Partial least squares - discriminant analysis (PLS-DA) correctly classified up to 93% of the paper specimens both by grammage and nanofibril content using NIR spectra.


Conclusion: this approach appears to be suitable for predicting physical and mechanical properties of Kraft papers and can detect cellulose nanofibril content in the paper matrix.

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