Recycled fibre
- Legislation
- Sources and quality of paper for recycling
- Recyclability of paper and board products – Deinkability
- Recycling versus recyclability
- Technical aspects of recycling
- Relevance of recyclability
- Repulpability and deinkability
- Deinkability test methods
- EPRC deinkability assessment
- Deinkability of different printed products
- Removability of adhesive applications
- EPRC assessment on removability of adhesive applications in graphic paper products
- Unit operations and equipment in recycled fibre processing
- Design of processes
- Design principles for stock preparation processes
- Process design for graphical grades, news print
- Process design for tissue
- Process design for board and packaging grades
- Reject and Sludge handling for graphical and tissue applications
- Reject and Sludge handling for board and packaging applications
- Water management
- Additives
- Deinking
- Bleaching of deinked pulp
- Process water treatment
- Sticky control – detackification
- Enzymatic solution for recycled fibres
- Papermaking potential of recycled fibre
- Differences between virgin and recycled fibre
- Repeated (manifold) recycling experiments
- Multiple papermaking with recycled fibres
- Modelling of fibre age distribution
- Special request of recycled fibre furnish in papermaking
- Effects of recycled fibre in papermaking
- Challenges of increased recycled fibre utilisation
Dithionite bleaching (Y) Common reductive bleaching chemicals used in treating recycled fibre pulp are sodium dithionite (sodium hydrosulphite) and formamidine sulphinic acid (FAS). FAS is finding increasing use primarily with wood-free recycled pulp. Reductive bleaching is essential not only for bleaching but also for colour stripping of coloured recovered paper and carbonless paper. Many of
Authors & references
Authors:
Roland Pelzer, James G. Tausche, Dr Jianhu Ma; Manuel Fuzy, Joerg Polste
Based on: Papermaking Science and Technology, book 7, Recycled fibre and deinking, Höke U. and Schabel S. (Book editor). Chapter 7 Additives. Jyväskylä, 2000, Fapet Oy. More references can also be found in this chapter.
References:
- Hache, M., Fetterly, N. and Crowley, T. (2001), North American Mill experience with DBI, 87th Annual meeting, PAPTAC, 30/1/2001–1/2/2001, Montreal.
- Vahlroos-Pirneskoski, S., Bleaching of ONP furnish with Borino, Proceedings of the COSTE46 meeting, Oulu, November 22, 2007.
- Rangamannar, G., Bettano, J. and Hebert, R. (2005), DBI bleaching of recycled fibers for the production of towel and napkin grades, 2005 Engineering, pulping and environmental conference, Philadelphia, USA, 28–31 Aug. 2005.
- Polcin, J. and Rapson, W.H., Pulp Paper Can. 72(3):T103 (1971).
- Polcin, J., Zellstoff Papier 22(8):226 (1973).
- Steenberg, E. and Norberg, G., Deutsche Papierwirtschaft (3):111 (1977).
- Schuster, G., Das Papier 32(7):299 (1978).
- Auhorn, W. and Melzer, J., Wochenbl. Papierfabr. 110(8):255 (1982).
- Melzer, J., Kinetics of bleaching mechanical pulps by sodium dithionite, 1985 International Pulp Bleaching Conference Proceedings, CPPA, Montreal, p. 69.
- Putz, H.-J., Upcycling von Altpapier fur den Einsatz in hoherwertigen graphischen Papieren durch chemisch-mechanische Aufbereitung, Ph.D. thesis, Darmstadt University of Technology, Darmstadt, Germany, 1987, 202 pp.
- Putz, H.-J. and Göttsching, L., Die Bleiche von deinktem Altpapier, 1984 EUCEPA Conference Proceedings, EUCEPA, Paris, p. 279.
- Nikki, M., Wochenbl. Papierfabr. 113(21):819 (1985).
- Melzer, J., Tippling, P. and Jokio, P., Wochenbl. Papierfabr. 113(18):684 (1985).
- Fluet, A., Dumont, I. and Beliveau, D., Pulp Paper Can. 95(8):37(1994).
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This page has been updated 15.11.2021