Methodology for robust control of pressure for epsilon-caprolactone polymerization in a twin screw extruder

In this paper we present a control system based on robust control, which wa s developed for the regulation of the pressure gradient at the output of a die. In addition, to model the dynamics of the process, we have chosen a se cond order model with dead time and the identification of dynamical paramet ers is performed by using the Marquard-Levenberg optimization method. Howev er, to cover the entire range of operation, we were forced to consider two models. The results of the simulation obtained with the robust control are satisfactory.