Closed loop viscosity control of reactive extrusion with an in-line rheometer

Autor:	T. O. Broadhead, W. I. Patterson, John M. Dealy
Rok vydání:	1996
Předmět:	Materials science Adaptive control Polymers and Plastics Rheometer Plastics extrusion General Chemistry Reactive extrusion Dead time Shear rate Viscosity chemistry.chemical_compound chemistry Materials Chemistry Composite material Ionomer
Zdroj:	Polymer Engineering & Science. 36:2840-2851
ISSN:	1548-2634 0032-3888
DOI:	10.1002/pen.10685
Popis:	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.
Databáze:	OpenAIRE
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