Project title : Real - Time Data Acquisition , Theoretical Modeling and Adaptive Control of Batch Dyeing Processes

We have continued to make good progress in all the diverse components of our research effort. Closed-loop control of dyeing processes requires real time monitoring of dyebath concentrations. Significant advances have been made in the use of both visible region absorption spectrophotometry, and flow-injection analysis (F.I.A.), for real-time dyebath analysis. Methods were developed for handling spectrophotometric interactions of dyes in complex dye mixtures. A second data acquisition system has been developed, featuring conformity to public standards, and modularity for flexibility, with robust and accurate data collection. Kinetic and equilibrium process models, based both on the diffusion equations, and on Langmuir kinetic models, have been developed and tested, with consideration of dye interactions in some cases. In addition to strictly parametric approaches to real-time adaptive control, a fuzzy logic controller has been developed to simulate the decision-making activities of an experienced dyer. Process models based on dimensionless groups of process variables have been developed, with particular emphasis on ionic dyeing systems. Our Ahiba Texomat dyeing machines have now been joined by an Ahiba Colormat dyeing machine for package dyeing studies.