Effect of Dispersion and Bleaching on the Mechanical and Optical Properties of Deinked Recycled Pulp

Document Type : Research Paper

Authors

1 Professor, Department of Wood and Paper Sciences and Technology, Faculty of Natural Resources, University of Tehran, Karaj,Iran.

2 Graduated MSc., Faculty of Natural Resources, Department of Wood and Paper Sciences and Technology, University of Tehran, Karaj, Iran.

3 Assistant Professor, Cellulose and Paper Technology Department, New Technologies and Energy Faculty, Shahid Beheshti University, Zirab, Iran.

4 Assistant Professor, Faculty of Agriculture and Natural Resources, Department of Wood and Paper Science and Technology, Karaj Branch, Islamic Azad University, Karaj, Iran.

Abstract

In this study the effects of oxidative bleaching and mechanical dispersion in different conditions on the optical and mechanical properties of deinked recycled pulp was investigated. Industrial deinked pulp was treated in the different conditions, including dispersion, combined oxidative bleaching during dispersion, and separate dispersion and then oxidative bleaching. Handsheet papers were made from obtained pulps and then scanned and taken photos were analyzed by Digimizer software, version 4.1.1.0 to analysis spot content. Optical and mechanical properties of obtained handsheets were determined and compared. Results indicated that mechanical dispersion decreased spot content and brightness and increased yellowing of the handsheets. Moreover, mechanical dispersion increased dry and wet tensile and burst strengths, water retention value (WRV), ash content and decreased tear strength of handsheet papers. This study revealed that combined dispersing and oxidative bleaching of de-inked pulp provided superior results in comparison to the separate dispersing and oxidative bleaching.

Keywords

Main Subjects

References

[1] Ghasemian, A. and Khalili, A., 2012. Fundamentals and Procedures of Paper Recycling, Aeij Press, Tehran, 169p. (In Persian).
[2] Bolanča Mirković, I. and Bolanča, Z., 2004. Chemichal and enzymatic deinking flotation of digital prints. In 4th International Conference Industrial Engineering-New Challenges to SME.
[3] Göttsching, L. and Pakarinen, H., 2000. Book 7: Recycled Fiber and Deinking. Jyväskylä, Gummerus Printing, Finland, 649p.
[4] Holik, H., 2006. Handbook of Paper and Board. Wiley-VCH verlag GmbH and CO. KGaA, Weinhein. Chapter 12, Testing of Paper, P.467-474.
[5] Kankaanpaa, V. and Soini, P., 2001. Approach to the conical dispersion and refining of recycled fiber. Fiber and paper, 3, 3.
[6] Li, Z. H. A. O., 2008. Disc heat-disperser: Structure principles and its application. China Pulp and Paper, 10, 021.
[7] Ruzinsky, F., Wang, M. H. and Bennington, C. P. J., 2003. Characterizing dispersion in newsprint deinking operations. Pulp and Paper Canada, 104(8): 30-35.
[8] Gao, Y., Qin, M., Yu, H. and Zhang, F., 2012. Effect of heat-dispersing on stickies and their removal in post-flotation. Bioresources, 7(1):1324-1336.
[9] Hamann, L., 2005. The role of deinking-flotation and micro-flotation for stickies reduction. In 7th PTS Stickies Seminar (P. 5-6).
[10] Lee, H. L. and Kim, J. M., 2006. Quantification of macro and micro stickies and their control by flotation in OCC recycling process. Appita Journal, 59(1): 31.
[11] Ortner, H. and Fischer, S., 1990. The application of dispersion for quality improvement of deinked pulps. In Pulping Conference: [proceedings] (USA).
[12] Sarja, T., MacNeil, D., Huber P. and Niinimaki, J., 2007. Removal of stickles in flotation. Progress in Paper Recycling, 16(3): 5-11.
[13] McKinney, R. (Ed.), 1995. Technology of Paper Recycling. Springer.
Iranian Journal of Wood and Paper Industries
Volume 7, Issue 1
June 2016
Pages 33-41

Files

Share

How to cite

Statistics