Potential of refining and dispersing to develop recycled fibre properties

ecyclingT38widely from one country to another, theoptimum technology may differ with thedeinking plant location as well as withtime.The combination of HC treatment andLC refining in series could lead to apromising final result, as suggested by Fujita/ Aikawa investigations in Japan [10].Finally, a new technology should bedeveloped to limit the detrimental effectsof refining, mainly fibre cutting. Since it isclear that refining of fibre mixtures willnever give the best development for eitherfibre [11], fractionation and selectiverefining of coarse mechanical fibres couldshow the way.ACKNOWLEDGEMENTSThe authors wish to thank their colleaguesKatharina Renner, WolfgangSpiess, Marko Lesiak, Harald Michels, StefanWinkelbauer, Klaus Müller-Gommertand Wolfgang Krodel for their collaborationin this study. A special thank to JaanaLumpiola and Sinikka Seppanen for performingthe laboratory work with excellentreliability.REFERENCES1. MOHLIN, U-B., MILLER, J. Influence of industrialbeating on swelling and fibre shape. Proc. AticelcaNew available techniques and current trends 4th internationalconference. Bologna Italy (1992).2. LUMIAINEN, J. Refining of deinked pulp formechanical printing papers. Sunds Defibrator.3. LUMIAINEN, J. Refining - a key to upgrading thepapermaking potential of recycled fibre. Paper Technology35(7): 41- 44(1994).4. LUMIAINEN, J. Refining recycled fibres: advantagesand disadvantages. Recycling: A TAPPI PRESSAnthology of published papers. Chapter 4 Deinking unitoperations. Tappi Press (1997).5. LJUNGKVIST, K. Pulp characterization by permeabilitymeasurements. Chalmers University of Technology.Goteborg, Sweden (1983).6. KRIEBEL, A.; SIGL, R. The influence of disk andkneading dispergers on fibre properties. Voith Paper.7. WESTON, J.D.W., GUEST, D.A. The importance ofCell wall structure in recycling fibres. Paper Technologyand Industry 26(7): 309-317(1985).8. KOLJONEN, T., HEIKKURINEN, A. Characterizationof refining effects on deinked pulp. Proc. PTSDeinking Symposium (1994).9. POUSI, J. Post refining of recycled fibres. Comparisonof the effect of HC and LC post-refining on therecycled fibres. Metso (2003).10. FUJITA, K. How to improve secondary fiber characteristicsfor paper board: report on recent trend andrecent refining technologies for OCC treatment. Proc.3rd CTP PTS Packaging Paper and Board Recyclinginternational symposium, CTP Grenoble, France(2004).11. BAKER, C. Advances in different refining methodsparticularly refining of mixtures. The 6th Pirainternational refining conference. Toronto (2001).Résumé: Nous avons caractérisé la performance du raffinage des fibres recyclées en terme de coupedes fibres, élimination de la paroi, fibrillation externe et interne, création d’éléments fins et diminution ducurl et des coudes. La spécificité du raffinage haute concentration (HC) par rapport au raffinage basseconcentration (LC) est la fibrillation interne et une coupe de fibre limitée. Un disperser diffère d’un raffineurde part l’augmentation du curl et des coudes. Comme attendu, le raffinage basse concentrationaméliore état de surface du papier, brillant, porosité, résistance à la rupture, mais dégrade main et résistanceà la déchirure. En outre, le raffinage HC offre plus de possibilités de développer les propriétés derésistance du papier.Reference: LE NY, C., MESSMER, M. Potential of refining and dispersing to develop recycledfibre properties. Pulp & Paper Canada 108(2): T35-38 (February, 2007). Paper presented at theRecycling Conference 2004 in Quebec, QC, September 27 - 29, 2004. Not to be reproduced withoutpermission of PAPTAC. Manuscript received July 08, 2004. Revised manuscript approved forpublication by the Review Panel July 24, 2006.Keywords: RECLAIMED FIBERS, REFINING, CONSISTENCY, FIBRILLATION, PAPERPROPERTIES.PULP & PAPER CANADA • 108:2 (2007) • 41