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      Analysis of Superimposed Influence of Double Layer Gas Flow on Gas-Assisted Extrusion of Plastic Micro-Tube

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          Abstract

          A plastic micro-tube is extremely small, and the melt is still in a molten state when the melt exits the die. The inner layer gas still flows in the micro-cavity after leaving the die, therefore, the diameter of the micro-tube increases gradually. When the outer layer gas leaves the die, it blows directly to the outer wall of the micro-tube. The flow of the double layer gas has a great influence on the extrusion of the micro-tube. To this end, a double layer gas-assisted extrusion model based on gas/melt two-phase flow is established. It focuses on the overlay effect of the double layer gas flow on the forming micro-tube. Through a finite element numerical simulation of the micro-tube extrusion process, forming the double gas layer inside and outside the tube wall, respectively, we obtain the shape, velocity, pressure drop and first normal stress difference of the micro-tube. The analysis shows that the double gas layer inside and outside the tube wall have asymmetrical effect on the melt, and they must be analyzed at the same time; the first normal stress difference is generated at the entrance of the die, exit of the die and downstream of the die exit; it reflects the extrusion deformation of the gas to the micro-tube, the degree of extrusion on the micro-tube wall, the distribution of the velocities X and Y, and the distribution of the pressure drop, to some extent. Compared with the micro-tube gas-assisted extrusion experiment, when the gas pressure is large, the result is consistent with the phenomenon of irregular corrugation on the wall surface of the micro-tube, the wall at the exit of the die is rapidly thinned and the wall downstream of the die exit gradually thins.

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          Most cited references 49

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          Explicit Formulas for Slip and Fluidity

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              Wall slip of molten high density polyethylene. I. Sliding plate rheometer studies

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                Author and article information

                Journal
                ipp
                International Polymer Processing
                Carl Hanser Verlag
                0930-777X
                2195-8602
                29 April 2020
                : 35
                : 2
                : 158-168
                Affiliations
                1 College of Mechanical and Electrical Engineering, Nanchang University, Nanchang, PRC
                2 Key Laboratory of Optic-electronic and Communication, Jiangxi Science and Technology Normal University, Nanchang, PRC
                Author notes
                [] Mail address: Xingyuan Huang, College of Mechanical and Electrical Engineering, Nanchang University, Nanchang 330031, PRC, E-mail: huangxingyuan001@ 123456126.com
                Article
                IPP3891
                10.3139/217.3891
                © 2020, Carl Hanser Verlag, Munich
                Page count
                References: 59, Pages: 11
                Product
                Self URI (journal page): http://www.hanser-elibrary.com/loi/ipp
                Categories
                Regular Contributed Articles

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