Modeling of melting process in a single screw extruder for polymer processing

Authors

• Ihor Mikulionok National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute" Peremohy ave., 37, Kyiv, Ukraine, 03056, Ukraine
• Oleksandr Gavva Educational-Scientific Engineering-Technical Institute named after acad. I. S. Gulogo National University of Food Technologies Volodymyrska str., 68, Kyiv, Ukraine, 01601, Ukraine
• Liudmyla Kryvoplias-Volodina EdEducational-Scientific Engineering-Technical Institute named after acad. I. S. Gulogo National University of Food Technologies Volodymyrska str., 68, Kyiv, Ukraine, 01601, Ukraine

Keywords:

single-screw extruder, polymer, granule, melting zone, boundary conditions, polymer stopper, temperature field

Abstract

We developed a mathematical model of the melting zone of a single-screw extruder for processing of polymers. The model takes into account a heat transfer of a polymer with a worm and a cylinder of an extruder (parameters of a heat transfer agent in the worm, as well as parameters of a heat carrier or electric heaters on the outer surface of the cylinder), as well as the real boundary conditions (the worm rotates, the cylinder is fixed).

The classical and most commonly spread plane-parallel model of the melting process, in contrast to the developed model, considers a fixed worm and a rotating cylinder extended on the plane. Therefore, processes that actually occur near the surface of a rotating worm are conditionally transferred to the side of a fixed cylinder and vice versa. It distorts fields of speed and temperature of a polymer in the worm channel, as well as the viscosity value of a polymer along the channel height.

We investigated a temperature field of a polymer in the worm channel, as well as a relative width of a polymeric stopper along the length of the melting zone of the extruder (the ratio of a width of the polymer stopper to a width of the worm channel). We compared results of the calculation with the experiment. We showed that the proposed model describes the process of melting of a polymer better than the classical inverse plane-parallel model. We also proposed the approach to modeling of an extruder in general as sequences of its interconnected functional zones.

The difference between calculated and measured values of the dimensionless width of the polymeric "stopper" from the dimensionless coordinate along the axis of the worm does not exceed 15 %. This is less than at using the traditional approach to modeling of the melting process.

The developed technique was successfully implemented for the modes of processing of various polymeric materials at extruders with worms of diameter 32, 45, 63, 90, and 125 mm.

The use of the developed mathematical model will make it possible to better forecast effective modes of the worm extruder, especially if it is necessary to account for heat transfer between surfaces of a worm and a cylinder, as well as processing of materials characterized by low thermal resistance

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, Educational-Scientific Engineering-Technical Institute named after acad. I. S. Gulogo 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

Liudmyla Kryvoplias-Volodina, EdEducational-Scientific Engineering-Technical Institute named after acad. I. S. Gulogo National University of Food Technologies Volodymyrska str., 68, Kyiv, Ukraine, 01601

PhD, Associate Professor

Department of Mechatronics and Packaging Technology

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2018-04-03

How to Cite

Mikulionok, I., Gavva, O., & Kryvoplias-Volodina, L. (2018). Modeling of melting process in a single screw extruder for polymer processing. Eastern-European Journal of Enterprise Technologies, 2(5 (92), 4–11. https://doi.org/10.15587/1729-4061.2018.127583

Applied physics