Investigation of Mixing Performance in the Extruder with Embedded Planetary-Screws

Abstract:

The novel geometrical configuration of embedded planetary-screws is proposed in the paper. The corresponding numerical simulation and the experimental investigation are carried out to characterize the mixing performance. Adopting commercial software FLUENT, the simplified physical model is presented with the boundary conditions imposed by UDF codes which are developed by us. Compared with the traditional single screw extruder, the flow and mixing are primarily investigated by using particle tracking technology. The sensitivity to initial positions is found in the novel screw configuration, which is caused by the periodic perturbation of planetary-screws. In contrast, the traditional laminar mixing occurs in single screw extruders. Compared with the traditional twin screw extruder, the experimental characterization of filled system of adding active nanometer CaCO3 into LLDPE matrix is conducted. No obvious difference in dispersion of CaCO3 is found when the extrusion samples are observed through scanning electron microscopy (SEM), on the condition that the both extrusion outputs are equal. The shear rate in the novel screw configuration is relatively smaller, and the extrusion characteristic is more excellent.

• Periodical: Advanced Materials Research (Volumes 781-784)
• Pages: 2809-2816
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.781-784.2809
• Online since: September 2013
• Authors: Liang He, Bai Ping Xu, Hui Wen Yu, Xiao Long Wang, Gang Xue
• Keywords: Embedded Planetary-Screw, Mixing, Particle Tracking, SEM

References

[1] Xianming Zhang, Lianfang Feng, et al: Polym. Eng. Sci. Vol. 1002-10 (2009), p.1772.

[2] Y. Nakayama, E. Takeda, T. Shigeishi, et al: Chem. Eng. Sci. Vol. 66 (2011), p.103.

[3] Kim S J, Kwon T H: Advances in Polymer Technology, Vol. 15-1(1996), p.55.

[4] Hwang W R, Kwon T H: Polym. Eng. Sci., Vol. 40 (2000), p.702.

[5] Xu Baiping: China Patent ZL200410077572. 6 (2004).

[6] Xu Baiping: China Patent 200710026246. 6 (2007).

[7] Xu Baiping, Wang Xiaolong, Li Jianggang, Chen Jinwei and Liu Yuejun: Journal of Guangdong Industry Technical College. Vol. 10-4 (2011), p.6.

[8] Xiaolong Wang, Baiping Xu, Yuejun Liu, Meigui Wang and Huiwen Yu: Polymer Materials Science & Engineering, Vol. 28-3 (2012), p.171.

[9] Chen Jinnan, Wang Yuanyang and Peng Jiong: Transactions of Beijing Institute of Technology, Vol. 30-1 (2010), p.109.