Dynamic behavior of a single screw plasticating extruder part II: Dynamic modeling

D. Chan, R. W. Nelson, L. James Lee*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


The dynamic response of a 2.5 inch plasticating extruder and the extrusion line are modeled using high density polyethylene and acrylics us extrudate. Screw speed, back pressure valve position, and material changes are used as forcing functions. Three fundamental transfer functions in the Laplace domain: a first order, a second order, and a lead‐lag, are developed to simulate the short term and long term responses of temperatures, pressures, and extrudate thickness. A kinetic‐elastic model which can predict rheological properties of non‐Newtonian, viscoelastic materials is also applied to the pressure responses of the extrusion process. This model can fit the experimental data well but due to the complexity involved in its parameter setting, more modifications are required before it can be applied for the control of extrusion process.

Original languageEnglish
Pages (from-to)152-161
Number of pages10
JournalPolymer Engineering & Science
Issue number2
StatePublished - Jan 1986


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