A Study of Dyeing Kinetics of the Poly(Ethylene Terephthalate) Interlaced Bi-Shrinkage Filament Yarn with Selective Disperse Dye

In this study, dyeing kinetics of the poly(ethylene terephthalate) (PET) interlaced bi-shrinkage and normal textured yarns were considered. The dyeing processes were carried out using C.I. Disperse Blue 183 at different times and temperatures. The experimental data were adjusted to well-known dyeing kinetic equations, i.e. Vickerstaff, Patterson, McGregor and Cegarra-Puente to determine the constant rate of dyeing and diffusion coefficient at different temperatures. The results showed that the exhaustion, constants rate of dyeing and diffusion coefficients were increased with increasing the time and temperature of dyeing process for both normal and interlaced bi-shrinkage PET yarns. Also in all similar dyeing times and temperatures, the exhaustion values and diffusion coefficients of interlaced bi-shrinkage PET yarns are higher comparing to normal PET yarns. The turning point of the exhaustion curve for the BSY PET yarn significantly was decreased (-50%) with increasing the dyeing temperature from 120 oC to 130 oC. Also activation energy of conventional PET yarn was observed 22.3% more than BSY PET yarn. The best adjustments of the both normal and interlaced bi-shrinkage PET yarns with applied dyeing kinetic equations were observed for the Vickerstaff equation.