Author : Md. Rokonuzzaman, Ahmed Jalal Uddin, Md. Abu Bakar Siddiquee, Md. Abdullah Al Mamun and A. K. M. Ayatullah Hosne Asif

The quality for any production process is usually inversely proportional to quantity. In the current work, this relationship has been shown in between the productivity of carding machine and the quality of respective it produced. Keeping the hank of delivery sliver constant (0.11 Ne here), card production rate (delivery speed of carding machine) was gradually increased from 60 -180 meter/min at five steps (60, 90, 120, 150 and 180 meter/min respectively). Subsequently 30/1 Ne carded ring knit yarns were produced with each sliver. The quality parameters of card sliver and yarns were studied by employing various instruments such as Uster AFIS (Advanced Fibre Information System), Uster evenness tester and yarn strength tester. It was found that with the increase of card production rate, the irregularity (Um% and CVm%) of card sliver and consequently the irregularity of yarn increased. Nep removal efficiency% of card decreases with increasing card production rate that directly reflected to high nep count in yarns. Thick and thin places of yarns are also reported higher with the increase of card production rate. Higher irregularity and imperfections of yarns caused from higher card speed resulted in the decrease in yarn strength. Nep removal efficiency of card, irregularity of sliver and yarn as well as imperfections (thick places, thin places and neps), yarn hairiness, yarn strength were found more satisfactory level at the card production rate of 60-120 meter/min. On the contrary nep removal efficiency of card, irregularity of sliver and yarn as well as imperfections, yarn strength, yarn hairiness at the card production rate of 180 meter/min were not found satisfactory. In this study card production rate 150 meter/min showed optimized delivery speed for satisfactory level of nep removal efficiency, irregularity as well as imperfections, hairiness and yarn strength.

Keywords: Nep removal efficiency, Carding, Imperfections, Production rate, Ring yarn

Article published in International Journal of Current Engineering and Technology, Vol.7, No.1 (Feb-2017)