A Comparison of the Hairiness and Diameter of Ring and Open-End Yarns

The structure and properties of Murata vortex spun yarns are investigated and compared with ring and open-end rotor spun yarns. Cotton yarns are spun from the same lot of Australian raw cotton fibers using the Murata vortex, ring, and open-end rotor spinning methods. Yarn structures are observed with an optical microscope equipped with a digital camera. Based on the digitized photographs, fiber arrangements are classified as wild, wrapper-wild, wrapper, belly-band. and core. Yarn diameter, yarn helix angle, wrapper fiber pitch, wrapper fiber crest, wrapper fiber length for a one-turn twist, and wrapper fiber helix angle to the yarn axis are examined, and yarn parameters such as tenacity, evenness, and hairiness are evaluated. The mechanical properties of dry relaxed yarns are measured with Kawabata Evaluation System instruments. Attempts are made to relate yarn structure differences to differences in the yarn formation mechanism for the three spinning meth ods. The differences in measured yarn properties such as evenness, hairiness, bulkiness. tenacity, compression properties, and bending properties can be explained by the observed differences in the yarn structure.

Section: Yarn Bulkinessmentioning

confidence: 99%

Structure and Properties of MVS Yarns in Comparison with Ring Yarns and Open-End Rotor Spun Yarns

Soe

Takahashi

Nakajima

et al. 2004

“…In recent years, with the development of different spinning systems, many researchers have been dealing with the comparison of the properties of yarns spun in these systems. Mohamed et al, 1 who compared the hairiness and diameter of ring and open-end yarns, concluded that the diameter of open-end yarns were roughly 10% larger than the corresponding ring yarns. The open-end yarns were also found to be less hairy than ring yarns, but the hairiness was found to have a higher coefficient of variation.…”

Section: Introductionmentioning

confidence: 99%

The properties of cotton-Tencel and cotton-Promodal blended yarns spun in different spinning systems

Kılıç

Okur

2010

In this study, structural, physical and mechanical properties of cotton-Tencel and cotton-Promodal blended ring, compact and vortex spun yarns were compared. Yarn properties such as hairiness, unevenness, imperfections, diameter, density, roughness, roundness, breaking force and elongation were evaluated. In general, hairiness values of ring yarns are the highest and vortex yarns are the lowest. In regard to unevenness, compact yarns have the best and vortex yarns have the worst values. When the effect of spinning systems is evaluated in terms of breaking force and elongation, results show that compact yarns have the highest values whereas vortex yarns have the lowest. In addition, effects of different blend ratios on a yarn’s structural, physical and mechanical properties were examined by using 100% cotton, 100% regenerated cellulosic fibre and 67%—33%, 50%—50%, 33%—67% cotton-regenerated cellulosic fibre blended yarns. In general, an increasing ratio of regenerated cellulosic fibre content in the blend decreases unevenness, imperfections, diameter and roughness values; on the other hand it increases breaking force, elongation, density and shape values. Effect of blend type is also statistically significant for many yarn properties. Mainly, it can be seen that while cotton-Promodal yarns have better physical properties, cotton-Tencel yarns have better mechanical properties.

“…Yet, the differences in the yarns' surface characteristics were registered as presented in Table 2 and the results suggest that these -----------------------------------------------------100 ⋅ = differences influenced the transport properties of the knitted fabrics. Mohamed et al [42] showed the reduction in the hairiness of the OE yarn with increased twist. In our investigation, negative correlation between yarn twist and hairiness, followed linear function, was also found (r = -0.70).…”

Section: Resultsmentioning

confidence: 99%

Ultraviolet Protection Factor of Gray-state Plain Cotton Knitted Fabrics

Stanković

Popović

Poparić

et al. 2009

The protection provided by clothing against ultraviolet (UV) radiation has been the subject of considerable recent research. However, a lack of investigations concerned with the influence of yarn properties on UV protection capabilities of fabrics seems to be present. This study investigated the influence of yarn twist and surface geometry on these properties of fabrics. The gray-state plain cotton knitted fabrics were produced from yarn differing in twist level under controlled conditions, so as to obtain as similar as possible construction of the fabrics. These plain knitted (single jersey) fabrics were spectrophotometrically assessed and UV protection factor was calculated. The results obtained indicated that yarn twist to a great extent influenced the UV protection properties of the knitted fabrics through the influence on yarn compactness and surface properties, which in turn influenced the open porosity of the fabric. The results were also interpreted as the consequences of minimal differences between knitted fabrics' construction (different stitch density), which could not be avoided because of the yarn twist differences.