Validation of crill measurements in a high-yield pulp refining process for improved fines material control
Source abstract
Abstract
Abstract In high-yield pulp (HYP) refining, fine material is created by peeling action on the fibre surface. This fine material is usually characterized using conventional camera technology and image analysis. The smallest particles, the crill, also created in the refining process are too small to be visible in a camera image, and are therefore measured using light sources in the UV and IR wavelength spectrum. This research sought to determine whether the crill could be characterized in the presence of large fines material in a HYP refining process, and the results indicated that the larger fines material had little impact. In addition, the variation in crill measurements declined as the fibre treatment increased and remained low and stable during an extended period. Due to the great need to monitor and control pulp processes using rapid online measurements, cost-reduction actions at mills running close to specification targets put high demands on the measuring devices characterizing the production. The outcome of this study enables the use of the crill method to improve our knowledge of fibre treatment and its contribution to fibre adhesion in complex refining processes. Finally, combining conventional camera technology and the crill method could improve the overall fines material control.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Advanced Cellulose Research Studies · Digital Image Processing Techniques · Material Properties and Processing
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
PulpEye AB , Örnsköldsvik , Sweden
Mid-Sweden University , Sundsvall , Sweden
References (20)
Show source-provided references
1. Bäckström, M., Kolar M-C., Htun, M. (2008) Characterization of fines from unbleached kraft pulps and their impact on sheet properties. Holzforschung 62: 546–552.10.1515/HF.2008.081 ↗
2. Bäckström, M., Bolivar, S., Paltakari, J. (2012) Effect of ionic form on fibrillation and the development of the fibre network strength during the refining of kraft pulps. O PAPEL 73(7): 57–65.
3. Bhardwaj, Nishi K., Duong, Tuan D., Nguyen, Kien L. (2004) Pulp charge determination by different methods: effect of beating/refining. Colloids Surf. A, Physicochem. Eng. Asp. 236:39–44.10.1016/j.colsurfa.2004.01.024 ↗
4. Chinga-Carrasco, G. (2011) Cellulose fibres, nanofibrils and microfibrils: The morphological sequence of MFC components from a plant physiology and fibre technology point of view. Nanoscale Res. Lett. 6(1):1–7.10.1186/1556-276X-6-417 ↗
5. Clark, J. D. A. (1969). Fibrillation, free water, and fiber bonding. Tappi J. 52(2):335–340.
6. Fernando D., Gorski D., Sabourin M., Daniel G. (2013) Characterization of fiber development in high- and low-consistency refining of primary mechanical pulp. Holzforschung 67(7):735–745.10.1515/hf-2012-0135 ↗
7. Fernando D., Muhic D., Engstrand P and Daniel D. (2012) Surface and internal micro/ultrastructure of TMP fibres produced during high-intensity refining elucidate the development of pulp and paper properties. Holzforschung 66(4):467–475.10.1515/hf.2011.175 ↗
8. Ferreira, P. J., Matos, S., Figueiredo, M. M. (1999) Size characterization of fibres and fines in hardwood kraft pulps. Part. Part. Syst. Charact. 16(1):20–24.10.1002/(SICI)1521-4117(199905)16:1<20::AID-PPSC20>3.0.CO;2-M ↗
9. Gorski, D., Hill, J. (2012) Improved quality of SC magazine paper through enhanced fibre development using the ATMP process. Nord. Pulp Pap. Res. J. 27:35–41.10.3183/npprj-2012-27-01-p035-041 ↗
10. Kang, T., Paulapuro, H. (2006) Effect of external fibrillation on paper strength. Pulp Pap. Can. 107(7/8).10.2524/jtappij.60.1202 ↗
11. Lindström, T., Aulin C. (2014) Market and technical challenges and opportunities in the area of innovative new materials and composites based on nanocellulosics. Scand. J. For. Res. 29:345–351.10.1080/02827581.2014.928365 ↗
12. Oksanen, T., Pere, J., Buchert, J., Viikari, L. (1997) The effect of Trichoderma reesei cellulases and hemicellulases on the paper technical properties of never-dried bleached kraft pulp. Cellulose 4(4):329–339.10.1023/A:1018456411031 ↗
13. Osong, S. H., Norgren, S., Engstrand, P., Lundberg, M., Hansen, P. (2014) Crill: a novel technique to characterize nano-lignocellulose. Nord. Pulp Pap. Res. J. 29(2):190–194.10.3183/npprj-2014-29-02-p190-194 ↗
14. Osong, S. H., Norgren, S., Engstrand, P., Lundberg, M., Reza, M., Tapani, V. (2016) Qualitative evaluation of micro fibrillated cellulose using the crill method and some aspects of microscopy. Cellulose 23(6):3611–3624.10.1007/s10570-016-1068-x ↗
15. Page, D. H. (1989) The beating of chemical pulps – the action and the effects. In: 9th Fundamental Research Symposium on Fundamentals of papermaking Cambridge, Mechanical Engineering Publications Limited, Bury St Edmunds and London, pp. 1–37.10.15376/frc.1989.1.1 ↗
16. Pettersson, T. (2010) Online crill measurements for improved control of refining. Control systems, Innventia AB, Stockholm, Sweden.
17. Rene, E., Ulrich, H., Wolfgang, B. A method to determine fibre wall damage induced by refining. Pulp and Fibre Technology Graz University of Technology, Institute for Paper, Graz, Austria, 2006.
18. Rundlöf, M (2002) “Interaction of dissolved and colloidal substances with fines of mechanical pulp: influence on sheet properties and basic aspects of adhesion”, PhD thesis, Royal Institute of Technology, Sweden.
19. Sandgren, B., Wahren, D. (1960) Studies on Pulp Crill – Part 3, Influence of Crill on Some Properties of Pulp and Paper. Svensk Papperst. 63(24):879.
20. Steenberg, B., Sandgren, B., Wahren, D. (1960) Studies on Pulp Crill, Part 1. Suspended fibrils in paper pulp fines, Svensk Papperst. 12:395–397.