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Jiang S, Liu H, Yu Z, Tang G, Jiang Q, Huang Y. Comparative analysis of gas-assisted extrusion of polypropylene sheet based on two types of gas intake. JOURNAL OF POLYMER ENGINEERING 2023. [DOI: 10.1515/polyeng-2022-0183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/09/2023]
Abstract
Abstract
The formation of a stable gas layer is to have a significant effect on polymer gas-assisted extrusion (GAE). Previously, for vertical extrusion forming, the gap intake method was used, which tends to result in very short stabilization times for the gas layer. In this study, the effect of two gas intake modes was compared based on horizontal sheet extrusion. The results show that stabilization of the gas layer is easily achieved in the vertical gas-assisted die by introducing gas first. However, when using parallel die, the gas distributes the melt uniformly along the surrounding velocity and the gas layer can be stable for a long time. Moreover, disrupting the process sequence also makes it easy to achieve gas layer stability without affecting the tability of the gas layer in the subsequent extrusion. And, during low-speed extrusion, the flow inertia of the polymer melt is used to extend the flow channel of the gas-free–assisted section into the gas-assisted section to overcome the gravity of the polymer melt and smoothly extrude it in the parallel gas-assisted die. The parallel die can be considered for the production of GAE of daily profiles and can be used to improve quality.
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Affiliation(s)
- Shiyu Jiang
- Jiangxi Province Key Laboratory of Precision Drive & Control , Nanchang Institute of Technology , Nanchang 330099 , China
| | - Hesheng Liu
- School of Mechatronics and Vehicle Engineering , East China Jiao Tong University , Nanchang 330013 , China
| | - Zhong Yu
- School of Physics and Electronic Information , Shangrao Normal University , Shangrao 334001 , China
| | - Gang Tang
- Jiangxi Province Key Laboratory of Precision Drive & Control , Nanchang Institute of Technology , Nanchang 330099 , China
| | - Qingsong Jiang
- School of Mechanical and Electronic Engineering , East China University of Technology , Nanchang 330013 , China
| | - Yibin Huang
- School of Physics and Electronic Information , Shangrao Normal University , Shangrao 334001 , China
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