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Wood Research and Technology

Holzforschung

Cellulose – Hemicelluloses – Lignin – Wood Extractives

Editor-in-Chief: Faix, Oskar / Salmén, Lennart

Editorial Board: Daniel, Geoffrey / Militz, Holger / Rosenau, Thomas / Sixta, Herbert / Vuorinen, Tapani / Argyropoulos, Dimitris S. / Balakshin, Yu / Barnett, J. R. / Burgert, Ingo / Rio, Jose C. / Evans, Robert / Evtuguin, Dmitry V. / Frazier, Charles E. / Fukushima, Kazuhiko / Gindl-Altmutter, Wolfgang / Glasser, W. G. / Holmbom, Bjarne / Isogai, Akira / Kadla, John F. / Koch, Gerald / Lachenal, Dominique / Laine, Christiane / Mansfield, Shawn D. / Morrell, J.J. / Niemz, Peter / Potthast, Antje / Ragauskas, Arthur J. / Ralph, John / Rice, Robert W. / Salin, Jarl-Gunnar / Schmitt, Uwe / Schultz, Tor P. / Sipilä, Jussi / Takano, Toshiyuki / Tamminen, Tarja / Theliander, Hans / Welling, Johannes / Willför, Stefan / Yoshihara, Hiroshi


IMPACT FACTOR 2017: 2.079

CiteScore 2017: 1.94

SCImago Journal Rank (SJR) 2017: 0.709
Source Normalized Impact per Paper (SNIP) 2017: 0.979

Online
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1437-434X
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Volume 65, Issue 6

Issues

Properties of wood chips for thermomechanical pulp (TMP) production as a function of spout angle

Lisbeth M. Hellström
  • Mid Sweden University, FSCN, Department of Natural Science, Engineering and Mathematics, SE-851 70 Sundsvall, Sweden
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/ Per A. Gradin
  • Mid Sweden University, FSCN, Department of Natural Science, Engineering and Mathematics, SE-851 70 Sundsvall, Sweden
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/ Per Engstrand
  • Mid Sweden University, FSCN, Department of Natural Science, Engineering and Mathematics, SE-851 70 Sundsvall, Sweden
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/ Øyvind Gregersen
  • Norwegian University of Science and Technology, Department for Chemical Engineering, N-7491 Trondheim, Norway
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Published Online: 2011-09-09 | DOI: https://doi.org/10.1515/HF.2011.087

Abstract

Spruce wood chips were produced under well-controlled conditions in a laboratory wood chipper at spout angles of 30°, 40°, and 50° at a cutting rate of 20 m s-1 and with a nominal chip length of 25 mm. The chips were then refined under thermomechanical pulp (TMP) conditions in a pilot refiner plant. The pulp properties such as freeness, average fiber length, and shives content were determined and evaluated as a function of specific energy consumption. For a first stage refining and for a freeness value of 350 ml, a decrease in specific electrical energy consumption could be achieved by performing the wood chipping at a spout angle of 50° as compared to 30° which is the spout angle commonly used. A patent application regarding this method has been filed and is pending. It is realized that a freeness value is not directly indicative of any quality measure, such as, for example tensile index and light scattering coefficient but the obtained results can be interpreted to be promising. Further studies are needed regarding the impact of the modified chipping process.

Keywords: chip damage; energy efficiency; spout angle of chipping; thermomechanical pulp (TMP); wood chipping

About the article

Corresponding author. Mid Sweden University, FSCN, Department of Natural Science Engineering and Mathematics SE-851 70 Sundsvall, Sweden


Received: 2010-08-10

Accepted: 2011-04-04

Published Online: 2011-09-09

Published Online: 2011-09-09

Published in Print: 2011-10-01


Citation Information: Holzforschung, Volume 65, Issue 6, Pages 805–809, ISSN (Online) 1437-434X, ISSN (Print) 0018-3830, DOI: https://doi.org/10.1515/HF.2011.087.

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