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  • 1. Gorski, D.
    et al.
    Mörseburg, Kathrin
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Johansson, Lars
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Role of equipment configuration and process chemicals in peroxide-based ATMP refining of spruce2011In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 26, p. 233-247Article in journal (Refereed)
  • 2.
    Hill, Jan
    et al.
    QualTech AB, Sweden.
    Johansson, Lars
    RISE - Research Institutes of Sweden, Bioeconomy, PFI.
    Mörseburg, Kathrin
    RISE - Research Institutes of Sweden, Bioeconomy, PFI.
    ATMP pulping of Norway spruce: Pulp property development and energy efficiency2017In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 32, no 1, p. 70-86Article in journal (Refereed)
    Abstract [en]

    ATMP pilot refining trials on Norway spruce were conducted. The ATMP configuration consists of selective wood disintegration and targeted application of chemicals when defibration already is initiated in order to achieve energy-efficient final fibre separation and development. ATMP was compared to TMP and RTS. The TMP like character was maintained despite of differences in pre-treatment, chemicals and primary stage refining energies. The fractional composition of the pulps was, however, altered. Bauer McNett R14 fraction exhibited the largest differences followed by P200 fraction. Thus different process alternatives produced pulps with different fingerprints. The amount of the R14 fibres is important as these tend to cause surface roughness impairing printability. Regardless of strategy, the ATMP pulp properties at equal tensile index (44 Nm/g) were equal or superior to those achieved by TMP or RTS refining. The main difference was the required specific energy input, ranging from 1.71 (TMP) to 1.05 MWh/BDT (ATMP with bisulphite addition). Primary stage refining was explored from multiple trials with the same process configuration and chemistry. The higher the specific energy applied the better is the energy efficiency. Furthermore established refining theories appear inadequate in describing the differences between process alternatives with respect to energy efficiency and pulp property development.

  • 3.
    Johansson, Lars
    et al.
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Hill, J.
    Gorski, D.
    Axelsson, P.
    Improvement of energy efficiency in TMP refining by selective wood disintegration and targeted application of chemicals2011In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 26, p. 31-46Article in journal (Refereed)
  • 4.
    Karlström, Anders
    et al.
    Chalmers University of Technology, Sweden.
    Johansson, Lars
    RISE - Research Institutes of Sweden, Bioeconomy, PFI.
    Hill, Jan
    QualTech, Sweden.
    On the modeling of tensile index from larger data sets2019In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669Article in journal (Refereed)
    Abstract [en]

    The objective of this study is to analyze and foresee potential outliers in pulp and handsheet properties for larger data sets. The method is divided into two parts comprising a generalized Extreme Studentized Deviate (ESD) procedure for laboratory data followed by an analysis of the findings using a multivariable model based on internal variables (i. e. process variables like consistency and fiber residence time inside the refiner) as predictors. The process data used in this has been obtained from CD-82 refiners and from a laboratory test program perspective, the test series were extensive. In the procedure more than 290 samples were analyzed to get a stable outlier detection. Note, this set was obtained from pulp at one specific operating condition. When comparing such "secured data sets" with process data it is shown that an extended procedure must be performed to get data sets which cover different operating points. Here 100 pulp samples at different process conditions were analyzed. It is shown that only about 60 percent of all tensile index measurements were accepted in the procedure which indicates the need to oversample when performing extensive trials to get reliable pulp and handsheet properties in TMP and CTMP processes.

  • 5.
    Mörseburg, Kathrin
    et al.
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Hill, J
    QualTech AB, Sweden.
    Nyseth, T-E
    BIM Kemi AB, Sweden.
    Johansson, Lars
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Understanding energy efficiency of different refining concepts from fibre and fines quality2014Conference paper (Refereed)
    Abstract [en]

    Comparative pilot refining trials with Norway spruce chips were conducted in order to gain a better understanding of the principal mechanisms on fibre level for achieving radical energy reduction in the novel ATMP refining concept. The ATMP pulping configurations proved superior energy efficiency in pulp quality development, compared to TMP, RTS and F-RTS concepts. Development of high tensile strength did not progress at the expense of light scattering, even with process chemicals present. Extensive testing of individual particles in long fibre, middle and fines fractions in combination with analyses of properties of fraction sheets has shown that Impressafiner/Fiberizer pre-treatment opens the wood structure, allowing for early development of desired single fibre properties and generation of fibrillar fines. Peroxide combined with magnesium hydroxide affected the interior of the fibre walls, thereby facilitating improved fibre flexibility, collapsibility and swelling. Bisulphite mainly affected the fibre length distribution, reducing the coarse fraction R14 and promoting the generation of considerable amounts of coarse fines and middle fraction particles.

  • 6.
    Mörseburg, Kathrin
    et al.
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Hill, Jan
    QualTech AB, Sweden.
    Johansson, Lars
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    ATMP refining of Norway spruce - Defibration characteristics and fibre wall properties2016In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 31, no 3, p. 386-400Article in journal (Refereed)
    Abstract [en]

    Defibration and fibre development patterns were investigated for the novel ATMP refining process, based on pilot scale trials with Norway spruce chips. ATMP refining with different chemical agents was compared to RTS refining with and without Impressa-finer (RT) and Fiberizer (F) pre-treatment. RT-F pre-treatment significantly improved both initial defibration, axial fibre splitting and fibre flexibility, compared to RTS primary stage refining without pre-treatment. Both types of investigated ATMP process chemistry - hydrogen peroxide combined with magnesium hydroxide under alkaline conditions (P) or acid sodium bisulphite (S) added to the primary refiner dilution water - further improved the fibre separation of RT-F pre-treated wood during primary stage RTS refining. This is largely attributed to enhanced fibre swelling. S-treatment facilitated frequent fibre separation within or close to the S2 wall layer, yielding extremely low shive levels and well-fibrillated, thin-walled fibres early in the process. S-treatment also rendered stiffer fibres, which made them susceptible to breakage, axial splitting and internal delamination. P-application is proposed to affect primarily the interior layers of the fibre walls, facilitating rapid fibre wall swelling towards the lumen, fibre softening and flexibilization.

  • 7.
    Mörseburg, Kathrin
    et al.
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Imppola, A.
    Johansson, Lars
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Ertsås, P.A.
    Effects of Inlet Pulp Quality and Specific Energy Consumption in Mill-Scale low consistency refining of Mechanical Pulp2013Conference paper (Refereed)
  • 8. Opedal, Mihaela Tanase
    et al.
    Stenius, Per
    Gregersen, Øjvind
    Johansson, Lars
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Hill, J.
    Flocculation of colloidal wood extractives in process water from precompression of chips in thermo-mechanical pulping2011In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 26, p. 64-71Article in journal (Refereed)
  • 9. Opedal, Mihaela Tanase
    et al.
    Stenius, Per
    Gregersen, Øjvind
    Johansson, Lars
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Hill, J.
    Removal of dissolved and colloidal substances in water from compressive pre-treatment of chips using dissolved air flotation: Laboratory Tests.2011In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 26, p. 72-80Article in journal (Refereed)
  • 10. Opedal, Mihaela Tanase
    et al.
    Stenius, Per
    Johansson, Lars
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Hill, J
    Sandberg, C.
    Removal of dissolved and colloidal substances in water from compressive pre-treatment of chips using dissolved air flotation: Pilot Trial2011In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 26, p. 364-371Article in journal (Refereed)
  • 11.
    Schachtl, M.
    et al.
    BASF SE, Germany.
    Erren, S.
    BASF SE, Germany.
    Scliönhaber, D.
    BASF SE, Germany.
    Dahlbom, P.
    Norske Skog Skogn, Norway.
    Steinsli, J. H.
    Norske Skog Skogn, Norway.
    Johansson, Lars
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Experiences with "dithionite Based Additives (DBA) in (C)TMP" in lab, pilot and mill scale: Synergies between high brightness, less specific energy consumption and development of pulp properties2016In: International Mechanical Pulping Conference 2016 (IMPC 2016), TAPPI Press, 2016, p. 59-69Conference paper (Other academic)
    Abstract [en]

    The purpose of this paper is to report about our experiences with treating softwood mechanical pulp (MP) with DBA directly injected into the gap of high consistency (HC) refiners used as chemical reactors to improve the competitiveness and the ecological footprint of (C)TMP based products. After the description of the main factors and pros and cons of conventional oxidative and reductive bleaching of sofhvood MP the basic principles of the treatment of MP with DBA in the (C)TMP refiner are outlined. By means of exemplary results of trials in lab, pilot and mill scale as well as of productions the main advantages of "DBA in (C)TMP" are illustrated: efficient brightness gain, reduction of anionic trash, high wood yield, reduction of hard chelating agents, saving of refining energy and increase of strength properties. Using the example of Norske Skog Skogn it is demonstrated how the system works in practice in the production of high bright and standard newsprint made from normal and lower quality wood. Finally it is pointed out that to a certain extent DBAs can be tailored to the needs of the respective mill.

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