Measured load profiles in high consistency first stage TMP refiner

Antti Fredrikson, Lauri Salminen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific


Understanding the refining phenomena of the chips at the refiner plate gap is a major key for the energy saving. We challenge old load distribution paradigms based on indirect reasoning by measuring shear force profiles of the first stage TMP refiner. Shear forces were measured in TMP refiner stator with RFS-system and they were exploited further to calculate the load profile of the refining area. Two plate patterns were tested (fine and coarse pattern) and two refining pressures (3 and 5 bars) with the coarse pattern. The narrower gap and the denser pitch of the fine plate pattern induced a rapid accumulation of refining energy at the breaker bar section whereas with the coarse plate pattern the load distribution was more uniform. But the coarse plate had its optimum load at lower level compared to fine pattern as we detected reduced fiber length when coarse plate was loaded more. Comparison of load profiles between two refiner pressures evidenced how the softer material is more profoundly refined at the outer periphery of the refiner. However the temperature profiles for these two pressures resemble strongly and this backs up the fact that the temperature and load profiles are not solvable from each other. Moreover we argue that, narrow hot area in the plate gap is an evidence of severe fiber cutting. Load distribution quantifies the refining energy usage and hence provides a useful tool to development of TMP refining.
Original languageEnglish
Title of host publicationProceedings of International Mechanical Pulping Conference 2011
PublisherChinese Academy of Forestry
ISBN (Print)978-7-5019-8251-6
Publication statusPublished - 2011
MoE publication typeB3 Non-refereed article in conference proceedings
EventInternational Mechanical Pulping Conference, IMPC 2011 - Xi'an, China
Duration: 26 Jun 201129 Jun 2011


ConferenceInternational Mechanical Pulping Conference, IMPC 2011
Abbreviated titleIMPC 2011


  • Data processing
  • energy saving
  • force measurement
  • high consistency refining
  • measurement technique
  • thermal measurement
  • thermo mechanical pulping
  • Picea abies
  • profile


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