Improvement of wet and dry layer strengths of paper from chemi-mechanical pulp using polyamide epichlorohydrin and cellulose nanofibers vs imported long fiber Kraft pulp

Document Type : Research Paper

Authors

1 PhD student, Department of Wood and Paper Sciences, Natural Resources & Marine Sciences, Tarbiat Modares University, Noor, Iran.

2 Wood and Paper Industries, Faculty of Natural Resources, Behbahan Khatam Alanbia University of Technology, Behbahan, Iran.

3 Assistant professor, Department of Cellulose Industries Engineering , Faculty of Natural Resources, Behbahan Khatam Alanbia University of Technology, Behbahan, I.R. of Iran.

4 sari agricultural and natural resources university

Abstract

The wet layer tensile strengths of the paper during production affects the frequency of breaking and its runability in the papermachine. In this study, the possibility of using cellulose nanofibers (NFC) and polyamide epichlorohydrin (PAE) vs imported long fiber  kraft pulp (LF) was investigated to improve the wet  and dry layer strengths of handsheet papers made from chemi-mechanical pulp (CMP). Strength properties of never-dried wet layer of papers with 35% consistency and air-dried papers were evaluated by pulp suspention and addition of 0 and 20% mineral calcium carbonate, NFC (at 2 levels, 2% and 3%), PAE (at 3 levels, 0.5%, 0.7% and 1%) and 20% of LF. Also, the effect of thermal treatments on the wet layer  strength of papers containing 3% NFC and 0.7% PAE at 100 and 130 °C tempratures was evaluated. Results showed that the addition of NFC together with PAE improves the wet and dry  layer strength properties of  papers. In the case of wet layers of  papers with 35% consistency, the addition of 3% NFC together with 1% PAE increased the tensile absorption energy (TEA) to 85%, although this was not as effective as using 20% LF (117%). In the case of air-dried papers, addition of 3% NFC and 1% PAE improved the papers TEA and tensile strength by 35% and 18%, respectively compairing with the addition of 20% LF. As a result of thermal treatments at 100 and 130 °C, the tensile strength of dried papers increased to 22 and 22.5%, respectively compared with the non-thermal treated papers. Overall, due to the positive performance of using NFC and PAE with thermal treatments, the combined use of 3% NFC and 1% PAE in CMP can be replaced by 15% LF to improve wet and dry papers strengths.

Keywords

Main Subjects

References

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Iranian Journal of Wood and Paper Industries
Volume 11, Issue 4
March 2021
Pages 627-643

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