Abstract
Yarn tensile properties, unevenness, and irregularities are the most important properties of the yarn quality parameters that determine the fabric’s mechanical properties and appearance. In the current study, the combined effect of carding machine parameters (cylinder speed, flat speed, cylinder to flat setting, and taker-in speed) on yarn properties (yarn strength, elongation, unevenness, and total yarn imperfection) have been examined. In this research, 40 samples of open-end yarn were produced and each of them was tested for their strength, elongation, unevenness, and imperfection. Design-expert 7.0.0 software and Factorial designing have been employed to analyze the results. The results from statistical analysis have showed that increasing the gap between the cylinder and flat setting and increasing the taker-in speed increased yarn unevenness and increasing cylinder speed, flat speed, and taker-in speed increased total yarn imperfection significantly. Similarly, increasing the flat speed, cylinder speed, and taker-in speed as well as increasing the gap between the cylinder and flat reduced yarn strength and elongation significantly.
Highlights
40 samples of open-end yarn were produced and each of them was tested for their strength, elongation, unevenness, and imperfection
The results from statistical analysis have showed that increasing the gap between the cylinder and flat setting and increasing the taker-in speed increased yarn unevenness and increasing cylinder speed, flat speed, and taker-in speed increased total yarn imperfection significantly
The total yarn imperfections increase as the production rate increases and cylinder speed is reduced, attributed to more cylinder loading [15]
Summary
The two well-known sayings, ‘the card is the heart of the spinning mill’ and ‘well-carded sliver is half spun’– demonstrate the enormous significance of carding for the end result of the spinning operation. Low front angle with too low cylinder speed and high frictional force will result in a bad quality of card sliver due to a decreased fibre transfer from the cylinder to the doffer [6, 7]. Single yarn strength reduces with the increasing production rate of the carding machine. This is attributed to more fibre transfer efficiency leading to less fibre opening and parallelization in the sliver [13]. The neps level in the card sliver reduces when the point density of top flats is increased, minimizing the yarn imperfection. This is attributed to the intensified opening of neps [14]. The purpose of this study is to research the combined effect of cylinder speed, flat speed, taker-in speed, and cylinder to flat setting on yarn properties like yarn strength, yarn imperfection yarn unevenness, and yarn elongation, which has not been studied so far
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