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Studies On Reverse Tension Mechanism Of Cheese Dyeing
Abstract
In this paper reverse tension mechanism were observed. Soft winding is the main criteria of level yarn dyeing. One of the most vital difficulty of Dyeing a yarn package in cheese form is the density variation of the soft wounded packages themselves and also within a package. . In most cases this density variation results unlevelness of dyed package. This type of unlevel is very common for double ply yarn where the density varies significantly. A through investigation had made to suggest effective ways to achieve evenly dens package in soft winding section in a well equipped modern yarn dyeing factory. A new method termed as ‘reverse tension mechanism’ has developed to maintain even density within a package and also at packages themselves .Co-efficient of variance found near 0.3% for the new technique whereas it is more than 1% for the current system. This paper shows that the density achieved by reverse tension mechanism is very uniform at different layers of a package and also at the packages themselves than the conventional machine settings for both carded and combed cotton double ply yarn of finer and coarser count. Keywords: Reverse tension mechanism; Portion density; Package to package & within package; Unlevelness. DOI: http://dx.doi.org/10.3329/diujst.v6i2.9344 DIUJST 2011; 6(2): 42-52
... They concluded that packages wound with varying density profiles were dyed with better levelness than the packages having even density [3]. Shaid, Siddiquee and Rahman investigated the effect of reverse tension mechanism on cheese dyeing [4]. They applied a winding tension curve having an increasing profile with respect to bobbin diameter and wound Ne 32/2 and Ne 20/2 carded and combed yarns. ...
... After dyeing and conducting dyeing levelness measurements, they concluded that better dyeing levelness was obtained with increasing tension profile and the dyeing levelness was better with finer yarns. They also concluded that package to package and within package density variations were higher with carded yarns compared to combed yarns [4]. Hes explained the measurement principle of the bobbin hardness instrument "UNITORQ" and how to improve dyeing levelness using the hardness measurement results [5]. ...
Step precision winding is a widely used bobbin winding method in industry, especially for dyeing bobbins. It is important to adjust winding parameters in an optimum way to obtain optimum hardness variation and best dyeing performance. Main winding parameters are winding pressure, crossing angle and yarn tension. This paper presents a research investigating the effect of main winding parameters on hardness distribution in radial and longitudinal directions of bobbins wound with step precision winding. Bobbins are produced from Ne 30/1 and Ne 10/1 cotton yarns. Bobbin hardness is measured by a new instrument called UNITORQ, which enables the measurement of relative bobbin hardness in radial and longitudinal directions with small increments of distance. It is found that crossing angle affects mainly longitudinal hardness variation while radial hardness variation is determined and affected in a large variation interval by winding tension. Winding pressure is seen to have no significant effect on winding hardness distribution in both radial and longitudinal directions but it determines bobbin hardness level together with winding tension and crossing angle.
The two main criteria for successful high speed yam winding with no yarn failure are maintaining yarn tension variations at a level sufficiently high to achieve package stability while at the same time keeping tension fluctuations to a minimum. Their importance arises from the fact that uneven tension causes uneven package density. which in turn results in unevenness in subsequent technological processes such as dyeing, knitting, weaving, etc. Therefore, to manufacture a package with acceptable quality features such as stability, constant density, constant package stiffness, etc., the yarn winding tension must be controlled during winding operations.
This book on the basic engineering principles of textile coloration contains eight chapters, each of which is abstracted seearately in this issue of World Textile Abstracts (see abstracts 1983/5277, 5278, 5279, 5280, 5281, 5282, 5370, and 5386).
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"Method for evenly dyeing yarn cheeses", United
states patent 5784735,
http://www.freepatentsonline.com/5784735.html
DKTE's Textile and Engineering institute
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Pavan S. Chinta and Sapna Dhar, DKTE's Textile
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Basic Principles of Textile Coloration
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Broadbent. Arthur D. "Basic Principles of Textile
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