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2014 | 35 | 1 | 121-135

Article title

A Study on Polymer Particle Flow in a Disk Zone of a Screw-Disk Extruder


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The paper presents the summary of research on polymer melt particle motion trajectories in a disc zone of a screw-disk extruder. We analysed two models of its structure, different in levels of taken simplifications. The analysis includes computer simulations of material particle flow and results of experimental tests to determine the properties of the resultant extrudate. Analysis of the results shows that the motion of melt in the disk zone of a screw-disk extruder is a superposition of pressure and dragged streams. The observed trajectories of polymer particles and relations of mechanical properties and elongation of the molecular chain proved the presence of a stretching effect on polymer molecular chains.









Physical description


1 - 3 - 2014
11 - 3 - 2013
13 - 2 - 2014
25 - 4 - 2014


  • Koszalin University of Technology, Department of Mechanical Engineering, Racławicka 15-17, 75-620 Koszalin, Poland
  • Koszalin University of Technology, Department of Mechanical Engineering, Racławicka 15-17, 75-620 Koszalin, Poland


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  • Diakun J., 2002. The way of microcomponent distribution in the worm and disk system of a screw-extruder. Inż. Ap. Chem., 41, 45-46.
  • Diakun J., Michalska I., 2004. Simulation of polyethylene macromolecules shifting in a disc zone of an extruder. Polimery, 49, 42-48.
  • Macko M., 2013. Economic-energetic analysis of multi edge comminution of polymer recyclates. Przem. Chem., 92, 8, 1499-1502.
  • Michalska-Pożoga I. 2006. Influence of a plasticizing mechanism of a screw-disk extruder on mechanical properties of extrudate. PhD thesis, Koszalin University of Technology, Koszalin, Poland.
  • Michalska - Pożoga I., Rydzkowski T., 2008. Estimation of mechanical properties of PP obtained by screw and screw-disc extrusion, In: Koszkul J., Bociaga E. (Eds), Polymers materials and processing. Czestochowa University of Technology, Częstochowa, 125-131.
  • Michalska - Pożoga I., Rydzkowski T., 2007. Selected rheological and mechanical properties of PE recyclate mixture with different concentration of original LD - PE obtained by screw-disk extrusion. 7th International conference Advances in Plastics Technology, Katowice, Poland.
  • Michalska-Pożoga I., Jakubowski M., 2012. Use of the computational fluid dynamics in a numerical analysis of molecular motion and polymer material pattern of flow in screw-disk extruder zone. Przem. Chem. 91, 9, 1808-1812.
  • Radomski G., 2005. Comparison of homogenization of polymers during the extrusion in screw extruder or screwdisk extruder. Polimery, 50, 374-378.
  • Rydzkowski T., Radomski G., 2008. Mixing ratios obtained using screw-disk-type and screw extruders; selected properties of reglanulate and the original material mixtures. Plast. Rubber Compos.: Macromol. Eng., 37(8), 376-380. DOI: 10.1179/174328908X356473.[WoS][Crossref]
  • Rydzkowski T., 2006. The influence of screw - disc extrusion on LD-PE properties. Europa/Africa Meeting of the Polymer Processing Society. Pretoria, South Africa.
  • Rydzkowski T., Michalska - Pożoga I., 2004. The properties change of LDPE in result of multiple extrusion on the basis of DSC investigations. In: Koszkul J., Bociaga E. (Eds), Polymers materials and processing. Częstochowa University of Technology, Częstochowa, 259-264.
  • Rydzkowski T., Michalska-Pożoga I., 2009. The movement trajectories of particles of material in disc zone of screw-disc type extruder. Technical transaction: Mechanika 3, Cracow University of Technology, 273-279.
  • Rydzkowski T., 2012. Theoretical and experimental basis of effective screw-disc extrusion in recycling of polymeric materials and composites. Wydawnictwo Uczelniane Politechniki Koszalińskiej, Koszalin.
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