Abstract
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<sub>1m</sub>% 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.
Highlights
Yarn formation is the process of converting loose fiber into a yarn structure, involving a progression of distinctly different and separate processes
We have examined the interactive effects of cylinder rpm of card and roller gauge settings on breaker drawing frame on combed yarn evenness and imperfections
The presented work demonstrated the dependency of ring spun combed yarn quality in terms of evenness and imperfections on variations of cylinder rpm and roller gauge settings of breaker drawing frame
Summary
Yarn formation is the process of converting loose fiber into a yarn structure, involving a progression of distinctly different and separate processes. On the other hand, exceeding higher cylinder speed can lead to higher neps generation which decreases the quality of card sliver Fiber hooks those are produced in carding machine influence the effective fiber length or fibre extent. Knowledge of the interactions of fiber length properties after carding process for various type of cylinder speed with the understanding of fiber drafting behavior for different roller gauge settings should be perceived in depth before combing operation. Since combing operation is specially destined for producing yarn having minimum imperfections and maximum evenness by removing short fibers and fiber neps those are considered as the main disturbing factors in spinning processes for getting quality yarn, so it demands the study of short fiber formations and NRE% in carding at various cylinder speed and the study of seeking the optimum roller gauge settings . We have examined the interactive effects of cylinder rpm of card and roller gauge settings on breaker drawing frame on combed yarn evenness and imperfections
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