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  • 1.
    Gard Timmerfors, Jessica
    et al.
    Umeå University, Sweden.
    Blomberg Saitton, David
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy, Processum.
    Sjölund, Torbjörn
    MoRE Research, Sweden.
    Jönsson, Leif J.
    Umeå University, Sweden.
    Impregnation of wood chips for acidic processes and the influence of wood chip length2018In: The 8th Nordic Wood Biorefinery Conference:  NWBC 2018: proceedings / [ed] Hytönen Eemeli, Vepsäläinen Jessica, Espoo: VTT Technical Research Centre of Finland , 2018, p. 195-195Conference paper (Other academic)
  • 2.
    Gard Timmerfors, Jessica
    et al.
    Umeå University, Sweden.
    Sjölund, Torbjörn
    RISE - Research Institutes of Sweden (2017-2019).
    Jönsson, Leif
    Umeå University, Sweden.
    New drum-chipping technology for a more uniform size distribution of wood chips2019In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434XArticle in journal (Refereed)
    Abstract [en]

    Wood chips from a novel type of drum chipper were compared to wood chips from a conventional disc chipper in an evaluation based on demonstration-scale and industrial-scale machinery. The evaluation was performed as the wood chippers were used as production machines in a kraft pulp mill using softwood. The average bulk density of the wood chips from the disc chipper and the drum chipper was similar and within the range of 138-140 kg/m 3 . The size distribution of the wood chips was investigated using a conventional screening method, and by using an automatized image-analysis system based on laser scanning. The average length was set to be the same, but the wood chips from the drum chipper had a more uniform length. The average thickness was similar, but the drum chipper generated slightly more thinner wood chips. Compared to the disc chipper and using the screening method, the drum chipper generated a similar fraction of oversized and overthick wood chips, 51% more large accept chips, 11% more total accept chips, and 74% less pin chips and fines. Image analysis resulted in similar data. The results indicate that drum chippers warrant further attention as an alternative to conventional industrial-scale disc chippers. ©2019 Jessica Gard Timmerfors et al.

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