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  • 1.
    Nordin, Lisa
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Measurement and prediction of dewatering characteristics for mechanical pulpsusing optical fibre analysis2009Licentiate 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.

  • 2.
    Nordin, Lisa
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
    O'Nils, Mattias
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Engstrand, Per
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
    Bäck, Roland
    SCA R&D Centre.
    Ferritsius, Olof
    Pöyry Sweden AB.
    Ferritsius, Rita
    Pöyry Sweden AB.
    Sandberg, Christer
    Holmen Paper Development Centre.
    Sundvall, Öjvind
    Eurocon Analyzer AB.
    Analysis of the quality of optical fibre and fines measurement for prediction of dewatering characteristics for mechanical pulpsManuscript (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.

  • 3.
    Nordin, Lisa
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
    O'Nils, Mattias
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Engstrand, Per
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
    Bäck, Roland
    SCA R&D Center.
    Ferritsius, Olof
    Pöyry.
    Sandberg, Christer
    Holmen Paper Development Centre.
    Measurement and prediction of dewatering characteristics for mechanical pulps using optical fibre analyzers2009In: Proceedings - 2009 International Mechanical Pulping Conference, IMPC 2009, 2009, p. 309-316Conference 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.

  • 4.
    Nordin, Lisa
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
    O'Nils, Mattias
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Engstrand, Per
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
    Sundvall, Öjvind
    Eurocon Analyzer AB.
    Characterization and classification of dewatering measurement techniques for mechanical pulps2008In: Proceedings of the PRS, Finland, May 2008., 2008Conference paper (Refereed)
  • 5.
    Nordin, Lisa
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    O´Nils, Mattias
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Engstrand, Per
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Sundvall, Öjvind
    Towards relevant dewatering measurement techniques: Caracterisation and classification of dewatering measurement techniques for mechanical pulps2008In: FMPRS May 2008, 2008Conference paper (Refereed)
1 - 5 of 5
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