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Process control of polymer extrusion. Part I: Feedback control
Author(s) -
Yang Bing,
Lee L. James
Publication year - 1986
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.760260304
Subject(s) - die swell , plastics extrusion , extrusion , materials science , set point , controller (irrigation) , die (integrated circuit) , barrel (horology) , compensation (psychology) , process (computing) , smith predictor , control theory (sociology) , process control , point (geometry) , pid controller , temperature control , composite material , control (management) , computer science , mechanical engineering , mathematics , engineering , control engineering , nanotechnology , artificial intelligence , psychoanalysis , biology , operating system , psychology , geometry , agronomy
Abstract On‐line computer control of extrudate thickness was carried out using a 2–1/2 Inch single screw plasticating extruder. Predried poly(methyl methacrylate) (PMMA) was extruded through a slit die. Two feedback control methods, a conventional PI controller and a Smith predictor dead time compensation, were tried for both set point changes (i. e., extrudate thickness changes) and load changes (i. e., screw speed changes). Results showed that both the PI feedback control and the Smith predictor were satisfactory for long term set point changes but not for load changes. Since the Smith predictor may compensate the process dead time, it would be useful for regulating short term set point changes such as barrel temperature settings.