Modeling the process of polymers processing in twin­screw extruders

Authors

DOI:

https://doi.org/10.15587/1729-4061.2018.139886

Keywords:

twin-screw extruder, co- and counter-rotating screws, boundary conditions, temperature field.

Abstract

We developed a mathematical model of the process of polymer processing in co- and counter-rotating twin-screw extruders. The model takes into account a heat transfer of a polymer with screws and a barrel, as well as real boundary conditions (screws rotate, a barrel is stationary).

We used the model of the allocated C-shaped volume, which is limited by one turn of cutting of each of screws and in which contains a volume of the processed polymer is located, for the analysis of the process. The model gives possibility to describe the process of processing both in the case of complete and partial filling of an operation channel with processed material. This is especially important in the case of dosed feeding of an extruder with a polymer, which is typical for modern extrusion equipment.

We studied a temperature field of a polymer in operation channels of co- and counter-rotating twin-screw extruders and compared the results of the calculation with experimental data. We substantiated theoretically and confirmed experimentally, that, unlike in a single-screw extruder, it is necessary to heat operation elements firstly and to cool them then (in the direction from a loading funnel to an extrusion head) in a twin-screw extruder.

We used the developed technique successfully at the development of modes of processing of various polymeric materials on co- and counter-rotating twin-screw extruders with screws of a diameter of 125 and 83 mm, respectively.

The discrepancy between the calculated values and the experimental values of temperature at the outlet of a twin-screw extruder with co-rotation screws Ø83×30D does not exceed 10 %. The experimental value of the temperature somewhat exceeded the given value. We explain this by the fact that the system of thermal stabilization of working elements for the studied processing modes could not remove released heat of dissipation effectively.

Application of the developed mathematical model will give possibility to forecast effective modes of operation of twin-screw extruders better, especially at processing of materials with low thermal stability.

Author Biographies

Ihor Mikulionok, National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute" Peremohy ave., 37, Kyiv, Ukraine, 03056

Doctor of Technical Sciences, Professor

Department of chemical, polymeric and silicate mechanical engineering

Oleksandr Gavva, National University of Food Technologies Volodymyrska str., 68, Kyiv, Ukraine, 01601

Doctor of Technical Sciences, Professor

Department of machines and apparatus for food and pharmaceutical productions

Educational-scientific engineering-technical institute named after acad. I. S. Gulyiy

Liudmyla Kryvoplias-Volodina, National University of Food Technologies Volodymyrska str., 68, Kyiv, Ukraine, 01601

PhD, Associate Professor

Department of Mechatronics and Packaging Technology

Educational-scientific engineering-technical institute named after acad. I. S. Gulyiy

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Published

2018-07-31

How to Cite

Mikulionok, I., Gavva, O., & Kryvoplias-Volodina, L. (2018). Modeling the process of polymers processing in twin­screw extruders. Eastern-European Journal of Enterprise Technologies, 4(5 (94), 35–44. https://doi.org/10.15587/1729-4061.2018.139886

Issue

Vol. 4 No. 5 (94) (2018): Applied physics

Section

Applied physics

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Copyright (c) 2018 Ihor Mikulionok, Oleksandr Gavva, Liudmyla Kryvoplias-Volodina

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