Estimation of Tensile Strength and Unevenness of Compact-Spun Yarns by Using Hvi Fiber Properties

Abstract

Compact spinning system, which has begun to gain an important place in textile industry, thanks to its desired yarn characteristics, was developed in the early 2000s. Less hairy yarns can especially be produced with this system, as stated in the literature. Moreover, the system has significant advantages in terms of tensile strength. In this study, yarns were produced with different yarn counts (Ne 40 -Ne 90) and different twist coefficients (αe 3.8, αe 4.2 and αe 4.6) using the compact spinning system. Regression analysis was carried out using the test results of the yarns produced and HVI fiber properties which were measured before the production. It was investigated whether the properties of the yarns can be estimated before production by using specified fiber properties. As a result of the analysis, the derived equations were used to estimate tensile strength and unevenness values of the yarns.

Assessing the Impact of Spacer Size Variations on the Ring-Spun Yarn Quality Ranking

“…With the increase of the spacer size, a tighter grip of the fibres occurred because of the rise in the drafting pressure, which ensured even drafting of the fibres [20]. All these matters reduce the irregularities of fibre strands; however, further increasing the spacer size can cause overcontrol, which may be responsible for the breakage of some fibres, increasing the unevenness [58]. Lastly, there is another reason for the higher unevenness value for the excessively higher spacer size leading to more slippage of fibres as they get more space to move, causing more uneven distribution of the fibres [22].…”

“…Moreover, larger spacer size increases the number of thick and thin places and neps because of the smooth gripping of fibres and uniform drafting [59]. However, overly increasing it negatively affects the fibre's movement, which may lead to uncontrolled movements [58]. Moreover, like the unevenness value, it can be said that an excessively sized spacer causes more fibre slippage to increase the imperfection values [60].…”