Production of fines from refined kraft pulp by fractionation with micro-perforated screens
Source abstract
Abstract
Abstract The objective in this work was to obtain a fine fraction of kraft pulp, with as high concentration as possible, in a pilot-scale fractionation with micro-perforated screen baskets. The influence of screen basket surface, hole size, feed concentration, pulp type and refining segment design was investigated. The results showed that a smooth screen basket surface improved the fractionation efficiency of the unrefined pulp compared to a profiled screen basket, despite a larger hole size. A significantly higher fine fraction concentration was obtained when using refined hardwood pulp compared to when using softwood pulp, which was explained with its lower average fibre length and narrower and thus more flexible fibre fragments. The pilot trials also showed that the screening process could be operated at feed concentrations similar to those directly after a refiner, 30–40 g/l. This was demonstrated in a process layout with partial recirculation where a refiner and a micro-perforated screen basket were operated in series in pilot scale.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Advanced Cellulose Research Studies · Material Properties and Processing · Surface Modification and Superhydrophobicity
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
RISE Research Institutes of Sweden , Stockholm , Sweden
6311 Mid Sweden University , CHE , Sundsvall , Sweden
Holmen , Stockholm , Sweden
References (20)
Show source-provided references
1. Aaltio, E. (1962) The effect of highly beaten birch pulp fraction on the properties of kraft pulp. Pap. Puu 6.
2. Asikainen, S., Fuhrmann, A., Robertsén, L. (2010) Birch pulp fractions for fine paper and board. Nord. Pulp Pap. Res. J. 25(11):15–22.10.3183/npprj-2010-25-03-p269-276 ↗
3. Björk, E., Bouveng, M., Vomhoff, H. (2020) Production of a fine fraction using micro-perforated screens. Nord. Pulp Pap. Res. J.10.1515/npprj-2020-0012 ↗
4. Bäckström, M., Kolar, M., Htun, M. (2008) Characterisation of fines from unbleached kraft pulps and their inpact on sheet properties. Holzforschung 62:546–552.10.1515/HF.2008.081 ↗
5. Ferluc, A., Lanouette, R., Bousquet, J.-P., Bussiere, S. (2010) Optimum refining of TMP pulp by fractionation after the first refining stage. Appita J. 63(4):308–314.
6. Gallager, B.J. Improving screening and cleaning efficiencies, short course. Tappi press, Atlanta, 1999.
7. Gavelin, G. Papp och kartong. Skogsindustrins utbildning i Markaryd AB, Markaryd. 1995.
8. Hyll, K. (2015) Size and shape characterisation of fines and filler – a review. Nord. Pulp Pap. Res. J. 30(3):466–487.10.3183/npprj-2015-30-03-p466-487 ↗
9. Kerekes, R., Schell, C. (1992) Characterisation of fibre flocculation regimes by a crowding factor. J. Pulp Pap. Sci. 18(1):32–38.
10. Kumar, S., Julien Saint Amand, F., Passas, R., Fabry, B., Leturcq, A., Carre, B. (2014) Micro-hole pressure screening and hydrocyclone fractionation applied to mechanical pulps for fractions generation. In: IMPC 2014. 29th International Mechanical Pulping Conference 2014, Helsinki, Finland.
11. Lobben, T.H. (1977) Effekter av finstoff på styrkeegenskaper hos kjemiske massor (Effect of fines on strength properties of chemical pulp). Norske Skog. 77(4):93–97.
12. Olson, J. The effect of fibre length on passage through narrow apertures. University of British Columbia, 1996.
13. Olson, J. (2001) Fibre length fractionation caused by pulp screening, slotted screen plate. J. Pulp Pap. Sci. 27(8):255–261.
14. Olson, J., Allison, B., Roberts, N. (1999) Fibre length fractionation caused by pulp screening, smooth-hole screen plates. In: 85th Annual meeting, Monteral, Que, Canada, 26–29 Jan 1999. pp. B207–B212.
15. Olson, J., Wherret, G. (1998) A model of fibre fractionation by slotted screen apertures. J. Pulp Pap. Sci. 24(12):398–403.
16. Olson, J.A., Roberts, N., Allison, B., Gooding, R. (1998) Fibre length fractionation caused by pulp screening. J. Pulp Pap. Sci. 24(12):393–397.
17. Retulainen, E., Luukko, K., Fagerholm, K., Pere, J., Laine, J., Paulapuro, H. (2002) Papermaking quality of fines from different pulps: the effect of size, shape and chemical composition. Appita J. 55(6):457–460.
18. Retulainen, E., Nieminen, K., Nurminen, I. (1993) Enhancing strength properties of kraft and CTMP fibre network. Appita J. 46(1):31–38.
19. Scott, G., Abubakr, S. (1994) Fractionation of secondary fibre – a review. Prog. Pap. Recycl. 3(3):50–59.
20. Sloane, M., Kibblewhite, P., Riddell, M., Williams, S. (2006) The pressure screen – a tool for the modern alchemist.