Document Type : Research Paper
Authors
1
M.Sc. Graduate of Pulp and Paper Technology, Faculty of Natural Resources, University of Tehran, Karaj, I.R. Iran
2
Assist. Professor, Wood and Paper Science& Technology Department, Faculty of Natural Resources, University of Tehran, Karaj, I.R. Iran
3
Assist. Professor, Wood and Paper Science & Technology Department, Faculty of Natural Resources, University of Tehran, Karaj, I.R. Iran
4
Assist. Professor, Department of Paper and Packaging, Faculty of Chemistry and Petrochemical Engineering, Standard Research Institute (SRI), Karaj, I.R. Iran
Abstract
The use of natural polymers in comparison with synthetic ones within coating structure would contribute to preserve recyclability and biodegradability characteristics of paper products. Hence, this study was carried out to investigate the effects of biopolymer barrier coatings on packaging paper properties. Therefore, the composite coatings consist of soy protein /cellulose nanofiber (SPI/CNF) with five levels of 0, 5, 10, 15, and 20 wt% CNF was applied at 5, 10 and 15 g/m2 coat weights on the liner base paper. In order to evaluate coatings effects, tensile strength, strain at break, burst strength, color difference, oil resistance, and water vapor transmission rate (WVTR) were considered. The results showed that the tensile index, strain at break and burst strength index of coated paper enhanced with increasing the CNF content and coat weights. Moreover, the color measurements demonstrated that coating of papers with SPI/CNF caused to more color difference in coated papers and it was darker in comparison with uncoated ones as the coat weights increased. The oil resistance and WVTR of coated papers were improved drastically and they were 86.87% and 76.61% respectively at highest CNF level and coat weight. In general, incorporation of CNF into SPI matrix led to an improvement in barrier and mechanical properties of coated paper.
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