Abstract: 22 dtex/68 f nylon 6 full draw yarns were prepared by high-speed melt spinning using semi-dull nylon chips as raw material and the effects of spinning process parameters on the properties of 22 dtex/68 f nylon 6 full draw yarns were discussed. The study examined the impact of various parameters, such as temperature, spinning speed, draw ratio, blowing pressure, and others, on the properties of 22 dtex/68 f nylon 6 full draw yarns. The properties analyzed included breaking strength, elongation at break, thermal shrinkage, and CV%. The results indicate that increasing the temperature setting leads to an increase in the breaking strength of the yarns and a decrease in the CV%. However, increasing the spinning speed or the draw ratio will reduce the breaking strength and increase the CV%. The blowing pressure mainly affected the CV%. After optimizing the production process, both the quality and stability were achieved. The breaking strength, elongation at break, and CV% of the 22 dtex/68 f nylon 6 full draw yarn were measured at 5.33 cN/dtex, 24.37%, and 0.83%, respectively.

Key words: full draw yarns; setting temperature; spinning speed; blowing pressure; CV%