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Rio, Jose C. / Laine, Christiane / Potthast, Antje / Takano, Toshiyuki / Theliander, Hans


International Journal of the Biology, Chemistry, Physics, and Technology of Wood

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Volume 62, Issue 3 (May 2008)


Effects of thermomechanical refining conditions on the morphology and thermal properties of wheat straw fibre

Ming-Zhu Pan
  • 1FPInnovations – Forintek Division, Quebec City, Quebec, Canada and College of Wood Science and Technology, Nanjing Forestry University, Nanjing, China
/ Ding-Guo Zhou
  • 2College of Wood Science and Technology, Nanjing Forestry University, Nanjing, China
/ Chang-Tong Mei
  • 3College of Wood Science and Technology, Nanjing Forestry University, Nanjing, China
/ James Deng
  • 4FPInnovations – Forintek Division, Quebec City, Quebec, Canada
/ Xiang-Ming Wang
  • 5FPInnovations – Forintek Division, Quebec City, Quebec, Canada
/ Tony S.Y. Zhang
  • 6College of Wood Science and Technology, Nanjing Forestry University, Nanjing, China
Published Online: 2008-02-14 | DOI: https://doi.org/10.1515/HF.2008.058


Wheat straw fibre is prepared by a thermomechanical (TM) refining system. This study investigated the effects of refining steam pressure (4, 6, 8 and 10 bar) and refiner speed (2500 and 3000 rpm) on the morphology and thermal properties of the resulting fibres. After TM refining, the fibres exhibited more surface irregularities and heterogeneities as well as decreased fibre length. The fine content decreased with increasing steam pressure, but the aspect ratio increased. The findings show that higher steam pressure (8 bar) results in more effective wheat straw refining. Refining lowers the pH. Thermogravimetric analysis showed that TM refining does not influence the thermal properties of wheat straw fibres. Weight loss has to be taken into account upon exposure to temperatures around 170°C. The silica content of the fibres was significantly reduced through refining.

Keywords: fibre morphology; pH; silica content; thermal stability; thermomechanical refining; wheat straw fibre

About the article

Corresponding author. FPInnovations – Forintek Division, 2665 East Mall, Vancouver, BC, V6T 1W5, Canada Phone +1-604-222-5741 Fax: +1-604-222-5690

Received: 2007-10-02

Accepted: 2008-01-03

Published Online: 2008-02-14

Published Online: 2008-02-14

Published in Print: 2008-05-01

Citation Information: Holzforschung, ISSN (Online) 1437434X, ISSN (Print) 0018-3830, DOI: https://doi.org/10.1515/HF.2008.058. Export Citation

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