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Träfflista för sökning "WFRF:(Hellström Lisbeth M. 1969 ) "

Search: WFRF:(Hellström Lisbeth M. 1969 )

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1.
  • Engstrand, Per, 1955-, et al. (author)
  • Method for producing and processing wood chips [Förfarande för framställning av flis]
  • 2012
  • Patent (pop. science, debate, etc.)abstract
    • This patent application describes a method to produce wood chips with the intention of reducing the energy consumption in the subsequent process steps for pulp production. With the present method wood chipping is done in a wood chipper where the chipping tool (3) has an angle γ (4) within the interval of 75° to 105° between the fibre direction of the log and the side of the tool which faces the chip (2). Angles in this interval will cause an axially directed compression of the chip which will cause a cracking of the wood during chipping.
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2.
  • Hellström, Lisbeth M, 1969-, et al. (author)
  • A device for studying wood chipping under realistic conditions
  • 2009
  • In: Proceedings - 2009 International Mechanical Pulping Conference, IMPC 2009. ; , s. 252-254
  • Conference paper (peer-reviewed)abstract
    • It seems to be a consensus in the papermaking society that chip quality is very much a matter of a narrow thickness distribution. Much effort has been spent on studying the influence of certain process parameters on the thickness distribution of chips. However, when these studies have been performed in a laboratory environment, the conditions have been far from realistic when it comes to for instance cutting rates. In this paper a laboratory chipper is presented, which has been developed to admit chipping at rates used in the industry. The knife holder is instrumented in such a way that moments and forces in three directions can be measured. Results from tests, where the cutting rate is varied, is presented and it is concluded that the laboratory chipper is a versatile tool in the process of increasing the understanding of the chipping process.    
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