This project work deals to investigate the interactive impact of cylinder speed and roller gauge setting of breaker drawing frame on ring spun combed yarn evenness and imperfections. In this work, carded slivers were produced by keeping cylinder rpm of 750 rpm, 800 rpm and 850 rpm while subsequent roller gauge settings (front zone/ back zone) in drawing frame were selected at three levels (i.e., F38mm/B42 mm, F40mm/B44 mm & F42mm/B46 mm) for each cylinder rpm. Cotton combed yarns of 32 Ne and 36 Ne from roving hank of 0.76 Ne have been produced for each combination of cylinder rpm and roller setting gauge. However, results show that best combination of cylinder rpm and roller gauge settings is found 800 rpm and F40/B44 respectively in terms of yarn evenness and imperfections for both types of yarn count. Moreover, roller gauge settings should be kept somewhat narrower (i.e., Front 38 mm/ Back 42 mm) for carded slivers produced at higher cylinder speed (i.e., 850 rpm), otherwise it is observed that short fiber percentage and CV 1m % of combed sliver have been increased for the combination of higher cylinder speed with wider roller gauge settings. As a result, final yarn evenness and imperfections results also have been deteriorated. On the other hand, for comparatively lower level of cylinder speed (i.e., 750 rpm) little wider roller gauge settings of subsequent drawing frame improves evenness and decreases SFC% of combed sliver and finally it has contributed to improve the combed yarn quality as well. Simultaneously it is also noticeable that comparatively wider roller setting (i.e., F42mm/B46 mm) gives poor results for all three level of cylinder speed. However, for both types of yarn count, results show similar trend in terms of evenness and imperfections but finer yarn count reacts more intensively in comparison with coarser count.

Microfiber leather is a type of synthetic leather made up of a high-grade polyurethane resin and microfiber bundles that resemble the microscopic characteristics of natural leather. Microfiber has benefited from its smaller diameter, which is similar to that of real leather fibrils. Microfibers have received a lot of focus and are frequently employed in the synthetic leather basis, which is an important factor in regulating synthetic leather functionality. Microfiber synthetic leather has advantages over natural leather in terms of mechanical behavior, for example. However, there is a significant difference between natural leather and microfiber synthetic leather in terms of other aspects, such as hygiene issues. Microfiber synthetic leather, unlike natural leather, has inferior transmission and absorption qualities, making it feel hotter. As a result, there is a pressing need to improve the sanitary performance of superfine synthetic leather. Several studies have endeavored to improve the hygienic qualities of MSLB by modifying it in various ways. It is attempted to make a review on the different types of modifications in brief.

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