塑料微管气辅挤出成型实验与机理分析

doi:10.11896/cldb.18100115

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Abstract In order to solve the extrudate swell, extrusion fracture and extrusion distortion problems generated by the traditional extrusion of plastic micro-tubes, the inner and outer layers of gas-assisted technique was applied into the extrusion forming of plastic micro-tubes in this work. The gas-assisted extrusion experiments of plastic micro-tubes were carried out. The experimental results were compared with that of the traditional extrusion. To further ascertain the reason that the gas-assisted method can overcome the problems produced by traditional method, the numerical simulations of traditional method and gas-assisted extrusion method were performed and compared with each other. Experimental results show that the gas-assisted technique not only overcomes the extrudate swell of traditional extrusion of plastic micro-tubes, but also improves the glossiness and transparency on the surface of extruded plastic micro-tubes. Numerical results show that by using the gas-assisted method, the pressure, shear and normal stress difference distributions of melts in the channel of die are greatly eliminated, especially at the outlet of die, which results in the melt’s sticky and no-slip shear flow of traditional extrusion is changed into the full slip and no sticky flow. Moreover, at the outlet of die, the flow velocity distributions of melt are uniformed even without sudden change and radial flow velocity. Therefore, the extrusion problems of plastic micro-tubes are well solved by means of the gas-assisted technique.

Key words： plastic micro-tube extrusion forming gas-assisted technique finite element analysis

Published: 06 November 2020

CLC number:

TQ320.66+3

Fund:National Natural Science Foundation of China (51763011), Natural Science Outstanding Youth Foundation Project of Jiangxi Province (2018ACB21006), the Natural Science Foundation of Jiangxi Province (20192BAB206016), Innovation of Outstanding Young Personnel Training Program (20192BCBL23015), and Project of Key Laboratory of Optic-Electronic Detection and Information Processing of Nanchang City (2019-NCZDSY-008).

About author:: Zhong Renreceived his doctor degree in June 2017 from Nanchang University. He is currently an associate professor in Key Laboratory of Optic-electronics and Communication, Jiangxi Science and Technology Normal University. He focuses on the researches of the new processing and forming technique of polymer materials and its application. In recent years, more than 40 papers have been published at home and abroad.

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Cite this article:

REN Zhong,HUANG Xingyuan,LIU Hesheng. Experiment and Mechanism Analysis of Gas-assisted Extrusion Forming for Plastic Micro-tube[J]. Materials Reports, 2020, 34(20): 20193-20198.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.18100115 OR http://www.mater-rep.com/EN/Y2020/V34/I20/20193

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