Effect of cationic polyDADMAC-based fixing agent on strength properties of OCC pulp

Document Type : Research Paper

Authors

1 M.Sc., Department of wood and paper science and technology, Faculty of natural resources, University of Tehran, Karaj, Iran

2 Assistant Prof., Department of wood and paper science and technology, Faculty of natural resources, University of Tehran, Karaj, Iran

3 Professor, Department of wood and paper science and technology, Faculty of natural resources, University of Tehran, Karaj, Iran

4 Associate Prof., Department of wood and paper science and technology, Faculty of natural resources, Tarbiat Modares university, Noor, Mazandaran, Iran

Abstract

Stickies are one of the main challenges in the papermaking industry, especially in recycling process of old corrugated containers (OCC). Application of a fixing cationic polymer is one of the main approaches to control these harmful substances. However, it is obvious that these agents besides fixing characters could also influence the final product properties. Therefore, in this study, the effect of using an industrial cationic polymer i.e. GL, as a stickies control agent on mechanical properties of hand-sheets made of OCC fibers, was assessed at three levels of 0.4, 0.8 and 1.2% (based on pulp dry weight) and at two pH ranges of 4 and 7. The characterization of the GL by FT-IR spectroscopy demonstrated that it was synthesized based on poly (diallyldimethylammonium‌chloride). The results showed that use of the cationic polymer enhanced the strength properties of the hand-sheets by influencing formation and inter- fiber bonding through fixing and flocculating the stickies and fines into the fibers network. These respective enhancements were measured at pH ranges of 4 and 7 as follows: Tensile strength of 35 and 30%, burst strength of 12 and 10%, ring crush test (RCT) of 29 and 21%, Concora medium test (CMT) of 19 and 32% and tear strength of 10 and 13%. It can be concluded that 0.4 % GL cationic fixing agent could be proposed as optimum value at pH =7 for industrial applications.

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References

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Iranian Journal of Wood and Paper Industries
Volume 10, Issue 4
February 2020
Pages 605-616

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