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Denim kumaşdünya çapında yaygın olarak kullanılan kumaş tipidir. İnsanların yaşam tarzlarıdeğiştikçe, denim kumaş zaman içinde estetik ve fonksiyonel özellikleraçısından önemli ölçüde gelişmiştir. İki veya daha fazla farklı özelliktekibileşenin özelliklerinden aynı anda optimum ölçüde yararlanabilmek içingeliştirilmiş hibrit iplik yapıları, denim kumaşta kullanılan yenilikçiyaklaşımlar arasındadır. Çalışmada özdeyün ve elastan filament, özlerin etrafında pamuk lifi içeren dual-core ipliklergeliştirilmiştir. İpliklerde öz olarak kullanılan doğal yün lifinin, denimkumaş formunda ısıl konfor sağlayacağı ve bu ipliklerden üretilecek kumaşların,temastaki soğukluk hissini azaltacağı düşünülmektedir. Geliştirilen inovatif yün/elastan içerikli dual-core ipliklerin özellikleribenzer şartlarda üretilen core-spun ve T400/elastan içerikli dual-core ipliklerile karşılaştırmalı olarak değerlendirilmiştir. Çalışmanın sonucunda, yün/elastan içeriklidual-core ipliklerin kütlesel düzgünsüzlük değerleri sadece elastan içeren core-spunipliklere göre düşük, T400/elastan içerikli dual-core ipliklere göre yüksek olduğugörülmüştür. İpliklerin tüylülük değerleri incelendiğinde, yün/elastan içerikli dual-core ipliklerin değerlericore-spun ipliklerinin değerlerinden yüksek, T400/elastan içerikli dual-coreipliklerin değerlerinden düşük olduğu bulunmuştur. Ayrıca, en düşük kopma mukavemeti değerleri,karşılaştırılan iplik grupları arasında yün/elastan içerikli dual-core ipliklerde gözlemlenmiştir., Denim fabric is the type of fabric widely usedworldwide. It has evolved considerably in terms of aesthetic and functionalproperties over time as people's lifestyles change. Hybrid yarn structuredeveloped to benefit from the features of two or more different components atthe same time is one of the innovative approaches used in denim fabric. In thestudy, dual-core yarns containing wool and elastane filament in the core andcotton fiber in the sheath were developed. It is thought that the natural woolfiber used as the core in the yarns will provide thermal comfort in the form ofdenim fabric and the fabrics that will be produced from these yarns willdecrease the feeling of coldness in the contact. The properties of innovative dual-corespun yarns containing wool/elastane were evaluated by comparing with propertiesof core-spun ve dual-core spun yarns containing T400/elastan produced under theequivalent conditions. According to the results of the study, it was found thatthe unevenness values of dual-core yarns containing wool/elastane were lowerthan the values ​​of core-spun yarns, having just an elastanecore, and it washigher than the values ​​of dual-core yarns containing T400/elastane. When thehairiness values ​​of yarns were examined, it was found that the values ​​ofdual-core yarns containing wool/elastane were lower than the values ​​ofcore-spun yarns and it was lower than the values ​​of dual-core yarnscontaining T400/elastane. Furthermore, the lowest tensile strength values​​were observed in dual-core yarns containing wool/elastane between the yarngroups compared.

Denimkumaşlarda oldukça fazla kullanılan pamuk liflerinin üretim sürecinde önemlimiktarlarda su ve çevreyi kirletici içerikli ilaçların kullanılmasının önemliçevre sorunlarına yol açacağı öngörülmektedir. Denimde sürdürülebilirlik amacıdoğrultusunda, pamuk lifine alternatif olarak yeni hammadde arayışları önemkazanmıştır. Öne çıkan doğal esaslı liflerden biri ekolojik özellikleriyle kenevirlifidir. Çalışmada denim kumaşlarda kullanılmak amacıyla üretilen %70/30 Pamuk/Kenevirkarışımında üretilen ring ve dual-core iplikleri (T400+Elastan) %100 pamukmuadil ring ve dual-core iplikleri ile karşılaştırılarak incelenmiştir. Her ikiiplik tipi için, kenevir içeren ipliklerin, pamuk içeren iplik numunelerinegöre düzgünsüzlük, hata indeksi vetüylülük değerlerinin fazla olduğu, kopma mukavemeti ve kopma uzamasıdeğerlerinin ise düşük olduğu görülmüştür., The use of significant amounts ofwater and polluting substances in the production process of cotton fibers,which are widely used in denim fabrics, is forecasted to cause environmentalproblems. In the purpose of sustainability in denim, the searchfor new raw materials as an alternative to cotton fiber has gained importance.Oneof the prominent natural fibers is hemp fiber with its ecological properties. In this study, 70/30% Cotton/Hemp the ring and dual-core yarns (T400 +Elastane) produced for use in denim fabrics were investigated by comparing with100% cotton equivalent ring and dual-core yarns. It was seen that unevenness, imperfection index and hairiness values ofhemp-containing yarns were higher compared to cotton-containing yarn samplesfor both yarn types, while tensile strength and breaking elongation values werelower.

In present study, it was aimed to researchthe correlation of the results of two different twist measurement techniques,such as twist-untwist and optical systems, for dual core yarns (Polyester andElastane cores- cotton wrapping fibres). Dual-core yarns can be produced on themodified ring spinning machine in two different ways (pre-treated dual-core anddual-core yarn). Also 100% cotton ring counterparts of dual core yarns wereproduced for three different yarn counts. In the study, the twist values of theyarn samples were measured and then the results were evaluated by correlationanalysis. According to the correlation analysis between the twist results ofboth measurement techniques, the highest correlation in the positive way wasobserved from the ring yarn samples whereas lowest correlation was observedfrom the dual-core yarns.

Thedenim has an important place in textile sector due to its comfortable,fashionable, durable and affordable properties. Denim sector has to constantlyevolve in order to meet varying consumer expectations. In this study, dual-core multi-twist slub yarns have been developed to give bothfunctional and visual effects to denim fabrics. Effects of core (elastomultiester and elastane) draft ratios on unevenness,hairiness, tenacity and breaking elongation properties of these yarns wereinvestigated. As a result of the study, it was found that theEME (Elastomultiester-I. core) draft values have a statistically significanteffect on the unevenness and breaking elongation values of the dual-core slubyarns; the elastane (II. core) draft values have also a statisticallysignificant effect on hairiness and breaking elongation values of yarns.

The denim. having a large customer base irrelevant of age, gender and social status limitation, has been one of the most important products for the garment sector. Denim fabric demand has diversified with the changing consumer's sense of life day by day. The denim manufacturers develop alternative production techniques and materials by turning towards new researches in order to adapt to consumer demands. One of the alternative materials. which am used in denim fabric structure. is the dual-core yams. The dual-core yarn is manufactured through the modified ring-spinning machine in order to benefit at the same time from the properties of two core components. In this study the influence of some production parameters such as twist level, wool draft and elastane draft on the properties of dual-core yams containing wool/elastane is investigated. The results indicated that the twist level is significantly effective parameter for the unevenness, hairiness, tenacity and elongation values of dual-core yarns. In addition, wool draft is significantly effective parameter for hairiness and breaking elongation values. It was also observed that variation of elastane draft level affects tenacity and elongation values of dual-core yams.