Document Type : Research Paper
Authors
1 Associated professor, wood and cellulose product department, Sari agricultural and natural resources university, Iran
2 Master degree, wood and cellulose product department, Sari agricultural and natural resources university, Iran
3 Retired Professor, wood and cellulose product department, Sari agricultural and natural resources university, Iran
Abstract
One of the problems of papers and cardboards in the packaging industry is the poor resistance to water, gas, and oil penetration. Nowadays, much research have been done on the use of biodegradable films and coatings based on polysaccharides to solve this problem. Chitosan is one of these polysaccharides that can be used as a biodegradable coating in packaging papers. In this study, the effect of chitosan on the strength and barrier properties of coated liner paper was investigated. Chitosan was used in three levels 10, 15, and 20 g/L acetic acids (1%) and with two softener ratios (glycerol) of 0.5 and 1 (based on dry weight of chitosan) for papers coating. Strength properties including tensile, burst and tear index and barrier properties including water absorption, air resistance, and oil absorption in the coated samples were investigated. The Statistical analysis of results showed that the barrier properties increased significantly. Also, the effect of increasing the concentration of softener in the coating solution on the properties of air resistance and oil absorption was positive but negative for water absorption. The basis weight, burst and tear index of the coated samples increased with increasing coating weight, on the other hand the tensile strength decreased. Moreover, increasing the concentration of softener in the coating solution showed a negative effect on the properties of the samples. The results of the scanning electron microscope images showed that formation of chitosan film and the increase in the uniformity of the liner paper surfaces, especially in higher consumption amounts.
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