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Closed loop viscosity control of reactive extrusion with an in‐line rheometer
Author(s) -
Broadhead T. O.,
Patterson W. I.,
Dealy J. M.
Publication year - 1996
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.10685
Subject(s) - rheometer , materials science , extrusion , plastics extrusion , reactive extrusion , viscosity , shear rate , rheology , composite material , mechanics , physics
A novel in‐line melt rheometer (ILR) measured viscosity to control ionomer neutralization during reactive extrusion. The ILR has the advantages of an in‐line location to minimize measurement delay and a “partial Couette” flow geometry, which affords independent control of the shear rate. The reactive extrusion process for ethylene methacrylic acid (EMAA) ionomer neutralization was modeled as a first order plus dead time process. A comparison of the process responses to experimentally determined residence time distributions for the extruder showed that there was an appreciable inherent delay despite the advantage of the rheometer's in‐line location. Proportional‐integral and minimum variance control algorithms were implemented. The quality of control was generally good, but demonstrated the non‐linearity of the neutralization process, suggesting that adaptive control techniques could improve control performance.