TVET Enrollment; Training Quality; Curriculum alignment; Trainer competency

Abstract

Hairiness is a critical quality parameter of spun yarns that determines their weaving and knitting performance as well as the quality of the resulting fabrics. Minimizing hairiness to enhance both yarn and fabric quality has generated significant interest. Ring spinning parameters and the number of draw frame passages directly affect the hairiness of ring-spun yarns. In this
study, ring spinning machine process parameters and the number of draw frame passages were modified to investigate their effect on the hairiness of a 27 Nm 60:40 polyester-cotton blended yarn. The hairiness index (H) was evaluated using an Uster Tester 5.The existing company parameters of 620 twists per meter (TPM), normal yarn path, 125mg traveller weight and two
draw frame passages gave a hairiness index of 6.6. The hairiness showed a reduction by 15% with an index of 5.6 for three draw frame passages and 660 TPM, with the existing normal yarn path and 125mg traveller weight. The left diagonal yarn path gave a reduction of 13% in hairiness for the existing parameters of two draw frame passages, 620 TPM and 125mg traveller. The effect of a twist level of 660 TPM gave a reduction of about 12% in hairiness with the existing two draw frame passages, normal yarn path and a traveller weight of 125mg. No significant change in hairiness was seen with a right diagonal yarn path and with a higher twist level of 700 TPM for the existing parameters. Yarn strength and evenness remained unaffected for the parameters which resulted in hairiness reduction.