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An S, Liao Z, Hong X, Huang Z, Yang Y, Sun J, Wang J, Yang Y. Hydrodynamics and film formation characteristics in a horizontal self‐cleaning twin‐shaft kneader for polymer devolatilization. J Appl Polym Sci 2022. [DOI: 10.1002/app.53350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- Shu An
- State Key Laboratory of Chemical Engineering, Department of Chemical and Biological Engineering Zhejiang University Hangzhou China
| | - Zuwei Liao
- State Key Laboratory of Chemical Engineering, Department of Chemical and Biological Engineering Zhejiang University Hangzhou China
| | - Xiaodong Hong
- ZJU‐Hangzhou Global Scientific and Technological Innovation Center Hangzhou China
| | - Zhengliang Huang
- State Key Laboratory of Chemical Engineering, Department of Chemical and Biological Engineering Zhejiang University Hangzhou China
| | - Yao Yang
- State Key Laboratory of Chemical Engineering, Department of Chemical and Biological Engineering Zhejiang University Hangzhou China
| | - Jingyuan Sun
- State Key Laboratory of Chemical Engineering, Department of Chemical and Biological Engineering Zhejiang University Hangzhou China
| | - Jingdai Wang
- State Key Laboratory of Chemical Engineering, Department of Chemical and Biological Engineering Zhejiang University Hangzhou China
| | - Yongrong Yang
- State Key Laboratory of Chemical Engineering, Department of Chemical and Biological Engineering Zhejiang University Hangzhou China
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Liu CY, Mikoshiba S, Kobayashi Y, Ishigami A, Yorifuji D, Tanifuji SI, Ito H. Experimental Investigation and Numerical Simulation of a Self-Wiping Corotating Parallel Octa-Screw Extruder. Polymers (Basel) 2022; 14:polym14061201. [PMID: 35335532 PMCID: PMC8953573 DOI: 10.3390/polym14061201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Revised: 03/14/2022] [Accepted: 03/14/2022] [Indexed: 01/27/2023] Open
Abstract
An octa-screw extruder (OSE) is equipment for pelletizing, blending, and mixing polymers and composites. In this study, the degree of resin filling, residence time distribution (RTD) of molten resin, and temperature profile in the octa-screw extruder were evaluated both experimentally and numerically. An intermeshing corotating parallel octa-screw kneading extruder was used for the experiments. For the comparison study, the results obtained from this extruder were compared with the twin-screw extruder. High-density polyethylene was selected as the material for extrusion. Meanwhile, a numerical code, based on a 2.5 D finite element method derived from the Hele–Shaw flow model, was developed to simulate the octa-screw extrusion process. The empirical outcomes suggest that octa-screw extrusion exhibited a narrower RTD of the molten resin compared with the twin-screw extrusion, suggesting better extrudate quality. The octa-screw extrusion also showed a lower temperature profile than twin-screw extrusion. The results of the simulation were also found to be in good agreement with experimental measurements. Experimental and numerical investigations of an OSE enable detailed comprehension and visualization of resin distribution in the entire length of the OSE, thus providing advantages in terms of process optimization.
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Affiliation(s)
- Cheng-Ying Liu
- Graduate School of Organic Materials Science, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan; (C.-Y.L.); (S.M.); (A.I.)
| | - Shota Mikoshiba
- Graduate School of Organic Materials Science, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan; (C.-Y.L.); (S.M.); (A.I.)
| | - Yutaka Kobayashi
- Research Center for Green Materials and Advanced Processing, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan;
| | - Akira Ishigami
- Graduate School of Organic Materials Science, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan; (C.-Y.L.); (S.M.); (A.I.)
- Research Center for Green Materials and Advanced Processing, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan;
| | - Daisuke Yorifuji
- HASL, Shakuji machi, Nerimaku, Tokyo 177-0041, Japan; (D.Y.); (S.-i.T.)
| | | | - Hiroshi Ito
- Graduate School of Organic Materials Science, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan; (C.-Y.L.); (S.M.); (A.I.)
- Research Center for Green Materials and Advanced Processing, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan;
- Correspondence: ; Tel.: +81-238-26-3081
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Experimental and Numerical Simulation Study of Devolatilization in a Self-Wiping Corotating Parallel Twin-Screw Extruder. Polymers (Basel) 2020; 12:polym12112728. [PMID: 33213055 PMCID: PMC7698560 DOI: 10.3390/polym12112728] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 11/10/2020] [Accepted: 11/10/2020] [Indexed: 11/17/2022] Open
Abstract
Devolatilization is an important process for separating and removing unnecessary residual volatile substances or solvents during the production of polymers using twin-screw extruders. Latinen proposed a surface renewal model to determine the concentration of volatile components in the extrudate of a single-screw extruder. When a twin-screw extruder is used to calculate the concentration, it is necessary to use the exposed surface area of the resin in the starved region of Latinen’s model, which, however, is difficult to estimate. In our previous work, we numerically determined resin profiles of the screws using the 2.5D Hele–Shaw flow model and the finite element method, which helps in estimating the surface area of devolatilization. In this study, we numerically analyzed the volatile concentration of the extrudate in a self-wiping corotating twin-screw extruder using Latinen’s surface renewal model along with our resin profile calculation method. The experimental results of the concentrations of the volatile component (toluene) in the extrudate of polypropylene agreed well with its numerical calculation with a relative error of 6.5% (except for the data of the lowest rotational speed). Our results also showed that decreasing the flow rate and increasing the pump capacity were effective for removing the volatile component. The screw pitch of a full-flight screw was not affected by the devolatilization efficiency with a fixed flow rate and screw speed.
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