دورية أكاديمية
Analysis of Superimposed Influence of Double Layer Gas Flow on Gas-Assisted Extrusion of Plastic Micro-Tube
| العنوان: | Analysis of Superimposed Influence of Double Layer Gas Flow on Gas-Assisted Extrusion of Plastic Micro-Tube |
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| المؤلفون: | Liu, T.-K., Huang, X.-Y., Ren, Z., Luo, C., Tan, J.-M. |
| المصدر: | International Polymer Processing ; volume 35, issue 2, page 158-168 ; ISSN 2195-8602 0930-777X |
| بيانات النشر: | Walter de Gruyter GmbH |
| سنة النشر: | 2020 |
| الوصف: | 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. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.3139/217.3891 |
| DOI: | 10.3139/217.3891/xml |
| DOI: | 10.3139/217.3891/pdf |
| الإتاحة: | https://doi.org/10.3139/217.3891Test https://www.degruyter.com/view/journals/ipp/35/2/article-p158.xmlTest |
| رقم الانضمام: | edsbas.B2C141A8 |
| قاعدة البيانات: | BASE |
| DOI: | 10.3139/217.3891 |
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