Role of Rheology in Extrusion

  • John M. Dealy
  • Kurt F. Wissbrun


Extrusion is the most important single polymer processing operation. Virtually every pound of thermoplastic polymer is subjected to an extrusion process at some point in its conversion to a finished article. It is more amenable to theoretical analysis than some other processing operations for a number of reasons:
  1. 1.

    It is a continuous, steady state process, not discontinuous like injection molding

  2. 2.

    For the most common mode of operation there are no free surfaces within the extruder, so that boundary conditions can be prescribed on known surfaces, and

  3. 3.

    Viscoelastic behavior plays only a minor role, and viscous fluid models have been found adequate for the analysis.



Shear Rate Melting Zone Leakage Flow Helix Angle Screw Speed 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • John M. Dealy
    • 1
  • Kurt F. Wissbrun
    • 2
  1. 1.Department of Chemical EngineeringMcGill UniversityMontrealCanada
  2. 2.Hoechst Celanese Research DivisionSummitUSA

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