The effect of melt viscosity on thermal efficiency for single screw extrusion of HDPE

Javier Vera-Sorroche, Adrian L. Kelly, Elaine C. Brown, Tim Gough, Chamil Abeykoon, Phil D. Coates, Jing Deng, Kang Li, Eileen Harkin-Jones, Mark Price

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


In this work, a highly instrumented single screw extruder has been used to study the effect of polymer rheology on the thermal efficiency of the extrusion process. Three different molecular weight grades of high density polyethylene (HDPE) were extruded at a range of conditions. Three geometries of extruder screws were used at several set temperatures and screw rotation speeds. The extruder was equipped with real-time quantification of energy consumption; thermal dynamics of the process were examined using thermocouple grid sensors at the entrance to the die. Results showed that polymer rheology had a significant effect on process energy consumption and thermal homogeneity of the melt. Highest specific energy consumption and poorest homogeneity was observed for the highest viscosity grade of HDPE. Extruder screw geometry, set extrusion temperature and screw rotation speed were also found to have a direct effect on energy consumption and melt consistency. In particular, specific energy consumption was lower using a barrier flighted screw compared to single flighted screws at the same set conditions. These results highlight the complex nature of extrusion thermal dynamics and provide evidence that rheological properties of the polymer can significantly influence the thermal efficiency of the process.

Original languageEnglish
Pages (from-to)2404-2412
Number of pages9
JournalChemical Engineering Research and Design
Issue number11
Early online date29 Dec 2013
Publication statusPublished (in print/issue) - 1 Nov 2014


  • Energy
  • Melt temperature
  • Polymer extrusion
  • Rheology


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