Impact of the Secondary Heater Temperature on the Properties of Draw Textured Yarn and its Fabric

<p>Synthetic yarn especially draw textured yarn (DTY) is increasingly favored worldwide due to its<br>advantages, availability, and ease of production over natural fibers. The bulk of DTY plays a critical<br>role in determining fabric properties, influenced significantly by the secondary heater temperature<br>during manufacturing. In this direction, trials were conducted on an AFT-1100-11DD machine using<br>240/48 SD, DD polyester POY. Six trials were conducted by varying the secondary heater<br>temperature while maintaining other parameters constant. Yarn tensions and fabric appearances<br>were evaluated across different settings. It was observed that, an increase in the secondary heater<br>temperature led to a reduction in bulk, decreased boiling water shrinkage (BWS %), and caused<br>variations in surface appearance. Power consumption also escalated with higher temperatures. Yarn<br>properties like denier, tenacity, and elongation remained consistent across trials, mitigating the<br>secondary heater's role in stabilizing these yarn properties post-primary heating. The inverse effect<br>of secondary heater temperature crucially influences the bulk and fabric behavior of DTY, which is<br>significant for applications in the weaving and knitting industries. Higher secondary heater<br>temperatures decrease the bulk and increase the yarn stability, impacting fabric aesthetics and<br>performance metrics like air permeability and drape coefficient.</p>