Investigating the Interactive Effect of Card Cylinder Speed and Roller Gauge Settings of Breaker Drawing on Combed Yarn Evenness and Imperfections
Hosne Ara Begum,
Md. Saitham Al Sagir Rakine,
Shadman Ahmed Khan,
Md. Khalilur Rahman Khan
Issue:
Volume 4, Issue 3, June 2019
Pages:
72-77
Received:
10 May 2019
Accepted:
12 June 2019
Published:
16 July 2019
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 CV1m% 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.
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 dr...
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Design of Simple and Double Ridge Waveguide T-Coupler for Space Domain
Fayza Bousalah,
Nour Eddine Boukli Hacene
Issue:
Volume 4, Issue 3, June 2019
Pages:
78-87
Received:
3 January 2019
Accepted:
7 February 2019
Published:
17 September 2019
Abstract: The T-Coupler or the magic tee (or magic T or hybrid tee) is a hybrid or 3 dB coupler used in microwave systems. It is an alternative to the rat-race coupler. In contrast to the rat-race, the three-dimensional structure of the magic tee makes it less readily constructed in planar technologies such as micro strip or strip line. The magic tee was originally developed in World War II, and first published by W. A. Tyrell of Bell Labs in a 1947 IRE paper. Robert L. Kyhl and Bob Dicke independently created magic tees around the same time. This paper illustrates simple and double ridge waveguide T-coupler. The relationships between the scattering variables in this sort of network are fixed by the unitary condition. Such a network has the properties that it is a matched device with one adjacent port decoupled from any incident port. The object of this paper is to present some results of simulation on the coupling and directivity of double ridge cross-waveguide couplers in a field ridge waveguide. This results are obtain by Ansoft HFSS using the Finite Element Method (FEM) calculations and the Genetic Algorithms method, and which show good performance.
Abstract: The T-Coupler or the magic tee (or magic T or hybrid tee) is a hybrid or 3 dB coupler used in microwave systems. It is an alternative to the rat-race coupler. In contrast to the rat-race, the three-dimensional structure of the magic tee makes it less readily constructed in planar technologies such as micro strip or strip line. The magic tee was ori...
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