Abstract
The present study was conducted to investigate the possibility of continuous dyeing and texturing of polyamide 6 yarns. To achieve this goal, a false-twist texturing machine was modified with impregnation and drying zones. Dye fixation and texturing were carried out using a heater temperature of 170 °C and contact time of 1.2–1.8 s at a texturing speed in the range of 34–51 m/min. The appropriate temperature of the drying zone was found to be 400 ± 2 °C. Furthermore, a suitable dyeing formulation with selective disperse dyes was determined to achieve high colour strength and fastness. The results showed that the crimp properties of the continuously dyed and textured yarns were similar to normally textured yarns. However, the tensile properties of the continuously dyed and textured yarns were worse than those of the normally textured ones. It seems that, according to the results obtained from this laboratory-modified texturing machine, it is possible to design a pilot plant and then an industrial machine.
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