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Nordin, Lisa
Publications (5 of 5) Show all publications
Nordin, L., O'Nils, M., Engstrand, P., Bäck, R., Ferritsius, O. & Sandberg, C. (2009). Measurement and prediction of dewatering characteristics for mechanical pulps using optical fibre analyzers. In: Proceedings - 2009 International Mechanical Pulping Conference, IMPC 2009. Paper presented at 2009 International Mechanical Pulping Conference, IMPC 2009; Sundsvall; 31 May 2009 through 4 June 2009; Code 79937 (pp. 309-316).
Open this publication in new window or tab >>Measurement and prediction of dewatering characteristics for mechanical pulps using optical fibre analyzers
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2009 (English)In: Proceedings - 2009 International Mechanical Pulping Conference, IMPC 2009, 2009, p. 309-316Conference paper, Published paper (Refereed)
Abstract [en]

The aim of this work was to obtain an on-line measurement for dewatering behaviour in the wire section based on fibre and fines characteristics. Four laboratory dewatering equipments were compared and the fibre characteristics were measured by means of optical fibre analyzers.

The results show that rough correlations do appear to exist between the dewatering equipments; however they rank the pulps differently depending on the raw wood material used and whether the refining conditions are mild or harsh. The prediction models based on fibre characteristics showed a high degree of statistical accuracy. The descriptions, however, proved not to be sufficiently good with regards to the dewatering behaviour for them to be used in relation to on-line applications. This might have been because consideration was not given to some important variables which do, in fact, have a significant impact on the drainability. These variables could include physical fibre properties or others that are not measured, or properties that, at present, are unable to be measured at a sufficient resolution.

Keywords
Dewatering equipment; Drainability; Fibre properties; Not given; On-line applications; On-line measurement; Optical fibre; Prediction model; Refining conditions; Significant impacts; Statistical accuracy; Wire section; Wood raw material
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:miun:diva-8951 (URN)2-s2.0-77951133221 (Scopus ID)
Conference
2009 International Mechanical Pulping Conference, IMPC 2009; Sundsvall; 31 May 2009 through 4 June 2009; Code 79937
Projects
Sensible things that communicate
Available from: 2009-05-18 Created: 2009-05-18 Last updated: 2010-06-14Bibliographically approved
Nordin, L. (2009). Measurement and prediction of dewatering characteristics for mechanical pulpsusing optical fibre analysis. (Licentiate dissertation).
Open this publication in new window or tab >>Measurement and prediction of dewatering characteristics for mechanical pulpsusing optical fibre analysis
2009 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

On‐line measurement of relevant fibre and pulp characteristics is necessary in order to increase

productivity and to maintain uniform quality. The drainage properties within the wire and the press

section are important factors since they affect the dry content after the press section. The higher the

dry content, the less the steam consumption and thus less energy is consumed. In some cases the

drier section has a limiting capacity and thus decreased web dryness will reduce the production. The

runnability in the paper machine is also affected by the dry content after the press section, because

web breaks might occur in the drier section or in the calendar.

The long term aim of this work was to obtain an on‐line measurement of dewatering behaviour in

paper machines based on optically measured fibre and fines characteristics. However, due to the

difficulty in obtaining pulps with sufficient distribution in dewatering properties and the difficulty in

varying the pulps characteristics on one single paper machine, a comparative study between four

different laboratory dewatering methods were conducted as a first step. Optical measured fibre

characteristics were used to attempt to predict the dewatering behaviour of the different laboratory

equipments for different mechanical pulps. In addition, a designed experiment was conducted in

order to further evaluate the quality of the optical fibre and fines measurement.

The results showed that there are rough correlations between the dewatering equipments; however

they rank the pulps differently depending on the wood raw material used and whether the refining

conditions are gentle or harsh. The prediction models formulated for the dewatering equipments

based on optically measured fibre characteristics showed rather good correlation between the

measured versus the calculated values; however, not sufficiently good for use in on‐line applications.

It was also found that the same measured fines amounts show different dewatering behaviour,

depending on the quality of the fines used. The difference in fines quality was, however, not

reflected in the optical measurement and it was thus concluded that there is a need for higher

resolution of the measurement equipments in order to make it possible to measure the shape and

the exact amount of the fines.

The results obtained from this work have provided an increase in both knowledge and understanding

and can hopefully be utilized in characterizing paper machine dewatering with on‐line measurements

of fibre properties in the future.

Series
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 38
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-10001 (URN)978-91-86073-45-9 (ISBN)
Presentation
(English)
Opponent
Supervisors
Available from: 2009-10-08 Created: 2009-10-08 Last updated: 2009-10-13Bibliographically approved
Nordin, L., O'Nils, M., Engstrand, P. & Sundvall, Ö. (2008). Characterization and classification of dewatering measurement techniques for mechanical pulps. In: Proceedings of the PRS, Finland, May 2008.: .
Open this publication in new window or tab >>Characterization and classification of dewatering measurement techniques for mechanical pulps
2008 (English)In: Proceedings of the PRS, Finland, May 2008., 2008Conference paper, Published paper (Refereed)
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:miun:diva-8949 (URN)
Available from: 2009-05-18 Created: 2009-05-18 Last updated: 2009-06-08Bibliographically approved
Nordin, L., O´Nils, M., Engstrand, P. & Sundvall, Ö. (2008). Towards relevant dewatering measurement techniques: Caracterisation and classification of dewatering measurement techniques for mechanical pulps. In: FMPRS May 2008.
Open this publication in new window or tab >>Towards relevant dewatering measurement techniques: Caracterisation and classification of dewatering measurement techniques for mechanical pulps
2008 (English)In: FMPRS May 2008, 2008Conference paper, Published paper (Refereed)
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-9495 (URN)
Projects
STC - Sensible Things that Communicate
Available from: 2009-07-28 Created: 2009-07-28 Last updated: 2011-04-08Bibliographically approved
Nordin, L., O'Nils, M., Engstrand, P., Bäck, R., Ferritsius, O., Ferritsius, R., . . . Sundvall, Ö.Analysis of the quality of optical fibre and fines measurement for prediction of dewatering characteristics for mechanical pulps.
Open this publication in new window or tab >>Analysis of the quality of optical fibre and fines measurement for prediction of dewatering characteristics for mechanical pulps
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(English)Manuscript (Other academic)
Abstract [en]

The quality of the optical fibre and fines measurement has been investigated. Fibres and fines of different quality were mixed in defined proportions and the mixtures were characterized by means of optical fibre measurements and dewatering behaviour. The results show that the same measured fines amounts show different dewatering behaviour, depending on the quality of the fines used. The difference in fines quality was, however, not reflected in the optical measurement. We conclude that this is caused by too low resolution in the optical measurement, so there is a large need for higher resolution of the measurement equipments in order to make it possible to measure the shape of the fines.

National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:miun:diva-8954 (URN)
Available from: 2009-05-19 Created: 2009-05-19 Last updated: 2010-01-14Bibliographically approved
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