Document Type : Research Paper
Authors
1 TMU
2 Wood and Paper Science and Technology Department, Faculty Of Natural Resources, Tarbiat Modares University
3 Assistant Professor, Tarbiat Modares University
Abstract
In production of paperboards especially the ones with high grammage, limitation of pulp drainage will drastically reduce the speed of papermaking process. In this manner, one of the common ways to improving the drainage and subsequent increasing of machine speed is producing the multilayer paperboards. Although sometimes these layers are connected to each other without applying any additives, but most of the time starch has been applied between the layers for improving the internal bonds of multilayer paperboards. In this study, the effect of spraying two kinds of starch commonly used in industry (native and oxidized starch) with different application dosages (0, 0.5, 1, 1.5 and 2 g/m2) was investigated. The top layer of double layered paperboard was made of recycled printing and writing pulp and the back layer was produced from old corrugated carton (OCC) recycled fibers. Grammage of each layer was set about 100 g/m2. The results showed that spraying native and oxidized starch improved all considered mechanical properties comparing the control sample (without spraying any additive). Also, the native starch indicated better results in comparison with oxidized starch. Moreover, in both native and oxidized starch, the best mechanical properties were observed with applying 1.5 g/m2 of mentioned additives.
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