The Process of Melt Homogenization in a Metered-Discharge Disk Extruder




extrusion, disk extruder, melt quality, temperature homogeneity, homogenization


Purpose. This paper aims to develop a physical model of the homogenization process in a metered-discharge disk extruder, as well as to select and justify the variable parameters that can be used to evaluate the efficiency of mixing and process control. Methodology. With the advent of a large number of alloying additives, filled and composite materials, there is a need for continuous monitoring and control of the melt homogenization process.  In classical worm extruders, the processes of feeding, melting, homogenization, and pressure generation are interconnected and are triggered simultaneously by a single working body, the worm, which makes it impossible to control each process separately to optimize them. In such cases, cascade extrusion schemes are used, where the process is divided into separate subprocesses or groups of them with the ability to control them independently. Findings. The scheme of a cascade disk-gear extruder is described, where a metered-powered disk extruder is used as a melt-homogenizer, and a gear pump is used to create pressure and dosing. The variable parameters of the disk extruder for adjusting the mixing efficiency are selected and substantiated. The speed components and their ratios for different parts of the homogenization zone are analyzed. The expediency of using a disk extruder as a melt-homogenizer in cascade extrusion schemes is substantiated. The adequacy of using the mixing index in the form of temperature inhomogeneity is emphasized. The homogenization zone in the form of four separate subzones and changes in the accumulated shear strain along each subzone, as well as the possibility of their regulation, are described. Originality. For the first time, a hydrodynamic model of processes in the homogenization zone of a metered-discharge disk extruder was developed and described. Practical value. The possibility of adjusting the velocity field in the homogenization zone of a disk extruder has been substantiated, which allows controlling the mixing effect directly during the extrusion process. The possibility of selecting the optimal mode of operation of the homogenization zone makes it possible to obtain a melt of a given quality with minimal energy consumption.


Mikulionok, I. O. (2009). Obladnannia i protsesy pererobky termoplastychnykh materialiv z vykorystanniam vtorynnoi syrovyny: monohrafiia. Kyiv: IVTs “Vydavnytstvo «Politekhnika»”. (in Ukrainian)

Novodvorskyi, V., Shved, M., & Shved, D. (2021). Evaluation of melt quality during polymer extrusion. Proceedings of the NTUU «Igor Sikorsky KPI». Series: Chemical Engineering, Ecology and Resource Saving, 4, 9-14. DOI: (in Ukrainian)

Stepanjuk, D. A., Shved, M. P., & Shved, D. M. (2015). The worm-gear extruder during processing the polymeric materials. ScienceRise, 3(2(8)), 31. DOI: (in Ukrainian)

Shved, M. P., Shved, D. M., & Bojarkin, O. O. (2017). Smoothing agent homogenizer of polymer melts on the basis of a disk extruder. Young Scientist, 3(43), 769-771. (in Ukrainian)

Shved, M. P., Shved, D. M., Lucenko, I. V., & Boghatyr, A. S. (2013). Advantages of use of cascade schemes and metering gear pumps when extruding polymers. Technology Audit and Production Reserves, 1(2(9)), 21–24. DOI: (in Ukrainian)

Tor-Svjatek, A., Krasinsjkyj, V., & Dulebova, L. (2014). Analiz efektyvnosti procesu ekstruziji porystogho polietylenu. Chemistry, technology and application of substances, 787, 434-440.

Abeykoon, C., Kelly, A. L., Martin, P. J., & Kang Li. (2013). Dynamic modelling of die melt temperature profile in polymer extrusion. In 52nd IEEE Conference on Decision and Control (pp. 2550-2555). DOI: (in English)

Abeykoon, C., Martin, P. J., Kelly, A. L., Li, K., Brown, E. C., & Coates, P. D. (2013). Investigation of the temperature homogeneity of die melt flows in polymer extrusion. Polymer Engineering & Science, 54(10), 2430-2440. DOI: (in English)

Cowden, D. J. (1957). Statistical methods in quality control. Prentice-Hall. (in English)

Domingues, N., Gaspar-Cunha, A., & Covas, J. A. (2008). Global Mixing Indices for Single Screw Extrusion. International Journal of Material Forming, 1(S1), 723-726. DOI: (in English)

Rauwendaal, C. (2016). Effective troubleshooting of extrusion problems. In AIP Conference Proceedings (Vol. 1779, No. 1, pp. 030021). DOI: (in English)

Rauwendaal, C. (2014). Polymer extrusion. Hanser Publications. DOI: (in English)

Wilczyński, K. (1988). A method for estimation of polymer melt temperature fluctuation in a single screw extrusion process. Polymer Engineering and Science, 28(7), 429-433. DOI: (in English)

Wood A.K. (2003). Determination of melt temperature and velocity profiles in flowing polymer melts. 8o Congresso Brasileiro de Polímeros, 1378-1381. (in English)



How to Cite

Novodvorskyi, V. V., & Shved, N. P. (2022). The Process of Melt Homogenization in a Metered-Discharge Disk Extruder. Science and Transport Progress, (3-4(99-100), 48–54.



Mechanical Engineering