Investigation of melting mechanism in a twin-screw extruder using a pulse method and on-line measurement

Hongbing Chen*, Uttandaraman Sundararaj, Krishnaswamy Nandakumar, Mark D. Wetzel

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

2 Scopus citations


A perturbation method was introduced to investigate the melting phenomena of polystyrene (PS) and polypropylene (PP) blend in a twin-screw extruder. A sliding barrel technique was used to realize the on-line visualization of the processes and to obtain the temperature and pressure profiles along the extrusion region. The melting behavior of PS/PP (80:20) blend was studied under various ratios of the flow rate (Q) over the screw rpm (N). It was found that the melting processes of the PS/PP blend in the TSE can be divided into three sections. Most of the melting occurred in a narrow transition from the partially filled region to the fully filled region. No large deformation of solid polymer pellets was found for all the processes studied here. The relative amount of solid concentration in the flow can be obtained through this perturbation method. It was shown that the solid concentration at the beginning of the fully filled region increased as the ratio of Q/N increased.

Original languageEnglish
Number of pages6
StatePublished - 2004
Externally publishedYes
EventANTEC 2004 - Annual Technical Conference Proceedings - Chicago, IL., United States
Duration: 16 May 200420 May 2004


ConferenceANTEC 2004 - Annual Technical Conference Proceedings
Country/TerritoryUnited States
CityChicago, IL.


  • Melting
  • On-line visualization
  • Perturbation
  • Twin-screw extrusion


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