Effects of pitched tips of novel kneading disks on melt mixing in twin-screw extrusion

Yasuya Nakayama, Nariyoshi Nishihira, Toshihisa Kajiwara, Hideki Tomiyama, Takahide Takeuchi, Koichi Kimura

研究成果: Contribution to journalArticle査読

2 被引用数 (Scopus)

抄録

In mixing highly viscous materials, like polymers, foods, and rubbers, the geometric structure of the mixing device is a determining factor for the quality of the mixing process. In pitched-tip kneading disks (ptKD), a novel type of mixing element, based on conventional kneading disks (KD), the tip angle is modified to change the channel geometry as well as the drag ability of KD. We discuss the effects of the tip angle in ptKD on mixing characteristics based on numerical simulation of the flow in the melt-mixing zone under different feed rates and a screw rotation speed. It turns out that the passage of fluid through the high-stress regions increases in ptKD compared to conventional KD regardless of the directions and sizes of the tip angle, while the fluctuation in residence time stays at the same level as the conventional KD. Furthermore, pitched tips of backward direction increase the mean applied stress on the fluid elements during its residence in the melt-mixing zone, suggesting the enhancement of dispersive mixing quality in ptKD. These understandings of the role of the tip angle on KD can give a basic guide in selecting and designing suitable angle parameters of ptKD for different mixing purposes.

本文言語英語
ページ(範囲)281-288
ページ数8
ジャーナルNihon Reoroji Gakkaishi
44
5
DOI
出版ステータス出版済み - 2016

All Science Journal Classification (ASJC) codes

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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