Effect of Surface State of Die on Flow Rate of Steamed Bamboo Powder in Thermal Flow Test Using Capillary Rheometer

Abstract:

Thermal flow tests were performed on steamed bamboo powder using capillaries that were processed under different conditions in order to investigate the effect of the die surface state on the fluidity of the woody powder. The capillaries were processed by wire-cut electric discharge machining, reaming or drilling, and the arithmetic average roughness (Ra) varied from 0.5 to 2.5 μm. The bamboo powder was first steamed at 200 °C for 20 min, and its particle size was then controlled using different mesh screens. The thermal flow temperature was set at 200 °C. The results indicated that the flow behavior improved with increasing particle size. For the capillaries processed by WEDM, the flow rate for samples with particle sizes of 75~150 and 150~300 μm decreased with increasing Ra. On the other hand, when reaming or drilling was used to process the capillaries, the flow rate was almost independent of Ra, regardless of the particle size.

• Periodical: Key Engineering Materials (Volumes 651-653)
• Pages: 830-835
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.651-653.830
• Online since: July 2015
• Authors: Shohei Kajikawa, Riku Sakagami, Takashi Iizuka
• Keywords: Bamboo, Mold Surface State, Particle Size, Thermal Flow, Woody Material

References

[1] J. J. Baratinecz, B. D. Park, The Effects of Temperature and Moisture Exposure on the Properties of Wood-Fiber Thermopastic Composites, J. Thermoplast. Compos., 10 (1997), 476-487.

[2] N. M. Stark, L. M. Matuana, C. M. Clemons, Effect of Processing Method on Surface and Weathering Characteristics of Wood-Flour/HDPE Composites, J. Appl. Polym. Sci., 44 (2004), 1021-1030.

DOI: 10.1002/app.20529

[3] O. Yamashita, H. Yokochi, H. Imanishi, K. Kanayama, Transfer molding of bamboo, J. Mater. Process Tech., 192-193 (2007), 259-264.

DOI: 10.1016/j.jmatprotec.2007.04.011

[4] T. Miki, N. Takakura, T. Iizuka, K. Yamaguchi, H. Imanishi, K. Kanayama, Injection Moulding of Wood Powder with Low Binder Content, JSME Int. J. A-Mech. M., 48 (4), 387-392.

DOI: 10.1299/jsmea.48.387

[5] I. Takahashi, Y. Takasu, T. Sugimoto, Y. Kikata, Y. Sasaki, Thermoplastic flow behavior of steamed wood flour under heat and compression, Wood Sci. Technol., 44 (2010), 607-619.

DOI: 10.1007/s00226-009-0297-7

[6] S. Kajikawa, T. Iizuka, Injection molding using only 200 steamed bamboo powder by controlling metal mold temperature, Procedia Engineering, 81 (2014), 1186-1191.

DOI: 10.1016/j.proeng.2014.10.095

[7] M. Otsuka, A. Oyabe, H. Ito, Effects of Mold Surface Conditions on Flow Length in Injection Molding Process, Polym. Eng. Sci., 51 (7) (2011), 1383-1388.

DOI: 10.1002/pen.21931

[8] M. Seki, H. Sugimoto, T. Miki, K. Kanayama, Y. Huruta, Wood Friction Characteristics during Exposure to High Pressure: Influence of Moisture Content of Wood, Mokuzai Gakkaishi, 58 (6) (2012), 302-308 (in Japanese).

DOI: 10.2488/jwrs.58.302

[9] Y. Murase, Friction-Reducing Method for Wood and its Application to Wood Machining I. Effect of Solid Lubricants and PEG Treatment, Sci. Bull. Fac. Agr., Kyushu Univ., 37 (3-4) (1983), 93-100 (in Japanese).