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Advances in Materials Science and Engineering
Volume 2015, Article ID 579659, 7 pages
Research Article

Effect of Heating at Oven-Dry State on Steam Treated Bamboo Powder Thermal Fluidity

Department of Mechanical and System Engineering, Kyoto Institute of Technology, Matsugasakigoshokaido-cho, Sakyo-ku, Kyoto 606-8585, Japan

Received 20 February 2015; Revised 8 June 2015; Accepted 30 July 2015

Academic Editor: Jiang Jianchun

Copyright © 2015 S. Kajikawa and T. Iizuka. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


In hot molding processes of woody material, it is important to understand the effect of oven-dry heating on the property of woody biomass material, such as thermal fluidity. In this study, thermal flow tests of untreated and steam treated bamboo powder were conducted to investigate the effects of heating at an oven-dry state on thermal fluidity. The test temperature was set to 200°C. Before the thermal flow test, powder was dry-heated in a capillary rheometer at 200°C with a variable heating time. Thermogravimetry was conducted to understand the thermal changes of the powder during an increasing temperature and constant temperature. Fluidity of untreated powder was improved with a short dry-heating but decreased with a long dry-heating. In contrast, steam treated powder fluidity was high compared to untreated one, but its fluidity did not improve from dry-heating. From these thermogravimetry results, the chemical changes associated with component volatilization relate with the thermal fluidity. Therefore, the decrease in fluidity from dry-heating occurred because fluidity related components escape from the powder through volatilization.