Abstract
In this study, color coordinates variation of spun-dyed polyester filament yarns subjected to the false twist texturing process was investigated. Furthermore, the effect of different processing parameters including D/Y ratio, twist, heater temperature, texturing speed, overfeed, the draw ratio and intermingling process on the color coordinates variation of textured yarns was studied. Finally, the magnitude of color variation was analyzed by studying the structure, crimp and tensile properties of the yarns. The results show that the nature of texturing and intermingling process had a significant effect on the color variation of yarns but different processing parameters had no significant effect. The level of these variations can be expressed by observing the fiber geometry change along the texturing process.