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Effects of thermomechanical refining conditions on the morphology and thermal properties of wheat straw fibre
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Ming-Zhu Pan
Published/Copyright:
February 14, 2008
Abstract
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
Received: 2007-10-2
Accepted: 2008-1-3
Published Online: 2008-02-14
Published Online: 2008-02-14
Published in Print: 2008-05-01
©2008 by Walter de Gruyter Berlin New York
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Keywords for this article
fibre morphology;
pH;
silica content;
thermal stability;
thermomechanical refining;
wheat straw fibre
Articles in the same Issue
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- Developing environmentally benign and effective organic wood preservatives by understanding the biocidal and non-biocidal properties of extractives in naturally durable heartwood
- Assessment of biodeterioration for the screening of new wood preservatives: Calculation of stiffness loss in rapid decay testing
- Degradation of thermo-hygro-mechanically (THM)-densified wood by soft-rot fungi
- FT-NIR spectroscopy in predicting the decay resistance related characteristics of solid Scots pine (Pinus sylvestris L.) heartwood
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