FLOW-INJECTION ANALYSIS OF DISPERSE DYEING OF ACETATE AND POLYESTER

Real-time monitoring of the exhaustion of water-soluble dyes has been extended to disperse dyeing of cellulose acetate and polyester. A prev iously described flow injection analysis system was modified to monito r disperse dyeings on a laboratory package dyeing machine. These equip ment modifications, as well as the process for selecting an appropriat e solvent, are presented. Calibration models for converting visible sp ectra to individual dye concentrations were developed using partial le ast squares regression. These models were validated with three-dye mix tures of known concentrations and then used to monitor disperse dyeing of cellulose acetate fabric and polyester yarns. Supercritical fluid extraction of disperse dye from the polyester yarn confirmed the conce ntrations as determined from real-time flow injection analysis.