**Author details**

of elastane and filament in yarn core gives new configurations to yarn geometry and ultimately changes the fabric geometry. Depending on developments in the yarn production technology, specially designed and functional yarns such as core-spun, filament core-spun

In this study, to design more attractive and higher performance denim fabric Co/PET/elastane containing dual core-spun yarns were systematically used in production. Furthermore, the effects of filament fineness and elastane draft on denim fabric performance were revealed. Filament core-spun yarns with different filament fineness and pure Co yarn were also produced to compare the performance of denim fabrics. These all yarn types were used as filling of denims. Breaking force, breaking elongation, static tear force, elastic recovery, vertical wicking rate and water absorption rate properties were inspected and results were analyzed statistically.

As expected from the structural properties of the core-spun yarns, incorporating filament contributes to breaking force of the denim fabric. On the other hand, it was observed that increasing elastane draft affects breaking elongation positively. This result is attributed to the fact that higher elastane draft leads to increase in cohesion forces between filament, elastane and cotton sheath. When dual core-spun denim fabrics containing PET filament with fine and micro fineness is considered, tear force raises from fine to micro fineness because of the higher number of filament in the core of the dual core-spun yarns and so higher resis-

In order to propound the advantages of the core-spun yarn usage, the performance of pure cotton denim fabrics were compared. It was seen that denim fabrics from pure cotton has the lowest elastic recovery. These results exactly proved that core-spun yarns can improve the mechanical performance of the denim fabrics without sacrificing the good softness and feeling of cotton. When the effect of core-spun yarn structural parameters on denim elastic recovery performance were investigated, in relation to the statistical analysis, it was also presented that both filament fineness and elastane draft have significant effect. Elastic recovery of the fabric can be aligned as cotton denims < filament core-spun denims < dual core-spun denims. The results in this study also indicates that the core-spun yarns not only increases the mechanical performance, but they also advance the comport performance. Higher wicking and absorption rates were obtained with core-spun and dual core-spun yarn denims in

For the absorption rate calculation, a novel method based on image processing was developed. Thus, the absorption area calculation was achieved accurately. In this experience, it was determined that the irregular color hues of indigo dyed warp yarns made the measurement difficult. High fabric thread density also restricted this measurement. So, it is planned that the absorption rate of the fabric samples will be determined by using different light source and

Authors would like to thank to Çalık Denim Textile Industry and Trade Inc. Research and Development Center for their contribution in the yarn and denim fabric samples production.

and dual core-spun yarns are produced and widely used.

tance to break.

36 Engineered Fabrics

comparison to pure cotton denim.

lighting condition in further study.

**Acknowledgements**

Osman Babaarslan1 , Esin Sarioğlu<sup>2</sup> \*, Halil İbrahim Çelik<sup>3</sup> and Münevver Artek Avci4

\*Address all correspondence to: sarioglu@gantep.edu.tr

1 Department of Textile Engineering, Faculty of Engineering and Architecture, Çukurova University, Adana, Turkey

2 Department of Fashion and Textile Design, Faculty of Fine Arts, Gaziantep University, Gaziantep, Turkey

3 Department of Textile Engineering, Faculty of Engineering, Gaziantep University, Gaziantep, Turkey

4 Çalık Denim Textile Industry and Trade Inc. Research and Development Center, Malatya, Turkey
