Abstract:In this study, a geometrical model was introduced to improve the hair trapping via a surface contacting the yarn-twisting triangle during ring twisting of two single yarns. The fiber-trapping improvement with the contact surface was analyzed theoretically. Then, single Ne 80 ring cotton yarns were used to produce two-ply yarns under different ring-twisting conditions, namely conventional twisting, dry twisting of yarns with a plane surface, wet twisting of yarns with a plane surface, dry twisting of yarns with… Show more
“…Among the properties improved by yarn folding, those of the greatest importance for the performance of textile materials are yarn evenness (uniform diameter), strength (and strength variation), liveliness (the reduction of residual torque), and yarn’s surface characteristics (hairiness). The characteristics of folded yarns have drawn the attention of many scientists from the 1950s to today (Bennett & Postle, 1979; Honold & Grant, 1961; Milosavljevic, Tadic, & Stankovic, 1998; Park & Oh, 2003; Skau, Honold, & Boudreau, 1958; Xia, Xu, & Wang, 2012). However, there is a serious lack of study about the effects of folded yarns on the properties of textile materials, especially those concerned with comfort properties.…”
The operation of folding provides a complex yarn differing to an appreciable degree from single components. Although the characteristics of folded yarns have been the subject of many investigations, there is a serious lack of study concerned with the influence of yarn folding on comfort properties of clothing materials. Therefore, this study focused on the effect of yarn folding on both thermal and tactile comfort of plain knitted fabrics. In addition to the structural characteristics of the yarns and knitted fabrics, the transport properties, deformation behavior and surface properties of the knitted fabrics were investigated. The results obtained indicated that the influence of yarn folding on thermal and tactile comfort properties of clothing materials is mainly positive. These effects were caused by the modification of yarn packing density which further influenced the air volume distribution as well as the fiber and yarn mobility within the fabric.
“…Among the properties improved by yarn folding, those of the greatest importance for the performance of textile materials are yarn evenness (uniform diameter), strength (and strength variation), liveliness (the reduction of residual torque), and yarn’s surface characteristics (hairiness). The characteristics of folded yarns have drawn the attention of many scientists from the 1950s to today (Bennett & Postle, 1979; Honold & Grant, 1961; Milosavljevic, Tadic, & Stankovic, 1998; Park & Oh, 2003; Skau, Honold, & Boudreau, 1958; Xia, Xu, & Wang, 2012). However, there is a serious lack of study about the effects of folded yarns on the properties of textile materials, especially those concerned with comfort properties.…”
The operation of folding provides a complex yarn differing to an appreciable degree from single components. Although the characteristics of folded yarns have been the subject of many investigations, there is a serious lack of study concerned with the influence of yarn folding on comfort properties of clothing materials. Therefore, this study focused on the effect of yarn folding on both thermal and tactile comfort of plain knitted fabrics. In addition to the structural characteristics of the yarns and knitted fabrics, the transport properties, deformation behavior and surface properties of the knitted fabrics were investigated. The results obtained indicated that the influence of yarn folding on thermal and tactile comfort properties of clothing materials is mainly positive. These effects were caused by the modification of yarn packing density which further influenced the air volume distribution as well as the fiber and yarn mobility within the fabric.
“…Another crucial reason was that the fiber ends dramatically concentrated on the yarn stem, resulting in uneven yarn formation when hairs were re-wrapped. 24 In contrast to the static grooved cylinder, the rotating grooved apparatus rubbed the yarn stem slightly and would not deteriorate yarn unevenness significantly due to rolling friction. Figure 9.Unevenness CVm of original yarns and yarns spun with static and rotary grooved cylinders.…”
Spinning with a static contact surface is an energy-saving method to reduce spun yarn hairiness; however, the spun yarn irregularity and tensile properties are deteriorated. To prohibit the deteriorations, this paper introduces a rotary grooved surface contacting ring spinning strand within the yarn formation zone. In theory, the modeling analysis of spinning with contact surface is conducted to reveal the prohibition mechanism of yarn irregularity and tensile property deteriorations for a rotary grooved surface. Theoretical analysis results indicated that groove-yarn surface friction could wrap the concentrated hairs onto yarn stem while block inflowing twists to the spinning strangle zone; the rotary grooved surface could reduce twist blockage and hair wrapping concentrations to better the situation after a comparison with the static grooved surface. Then, two kinds of specially-designed grooved cylinders (one was rotatable while the other was static) were used to validate the theoretical analysis. The experimental results showed that, unlike the static grooved cylinder which significantly deteriorated the original yarn unevenness CVm, the rotary achieved significant hairiness reduction without any significant deterioration of other yarn properties. This might be due to the decreased friction and twist propagation for the rotary grooved cylinder contacting the spinning strand. In this case, spinning with a rotary grooved cylinder was preferably applied in the first step to control ring spun yarn hairiness.
“…Xia ve ark [40], iki adet tek katlı ipliğin ring iplik eğirme sisteminde eğrilmesi sırasında eğirme üçgeni oluşum bölgesine yerleştirilen farklı yüzeydeki yapılar ile liflerin temas yüzeyini artırarak liflerin iplik yapısına daha çok katılması araştırılmış-lardır. Çalışma kapsamında katlı ipliklerin tüylülük değerlerinin yivli ve düz yüzeylerde ıslak koşullarda azaldığı görülmüştür.…”
“…Çıkış silindirleri sonuna eklenen farklı yüzeydeki yapılar a) geleneksel eğirme sistemi b) düz yüzeyde kuru eğirme c) düz yüzeyde ıslak eğirme d) kuru yüzeyde ıslak eğirme e) yivli yüzeyde ıslak eğirme [40] Şekil 10. Kompakt-siro çekim bölgesine ilave edilen hava kanallı yapı [41].…”
Son zamanlarda, hem ekonomik açıdan geleneksel ring iplik eğirme sistemlerine alternatif olabilecek hem de daha üstün kalite özelliklerine sahip iplik üretebilecek sistemler üzerine çalışmalar yoğunlaşmıştır. Literatür incelendiğinde, bu amaçla yapılan çalışmaların önemli bir bölümünün geleneksel ring iplik eğirme sistemleri üzerinde bir takım değişiklikler yapılmasına yönelik olduğu görülmektedir. Aynı zamanda, geleneksel ve modern eğirme sistemlerini bir arada kullanarak daha üstün özelliklere sahip iplik üretimini hedefleyen, daha ekonomik sistemlerin tasarlanmasını konu alan çalışmalar da oldukça fazladır. Bu çalışma kapsamında geleneksel ring iplik teknolojisi esas alınarak geliştirilen siro-spun iplik eğirme sistemlerini, bu sistemler üzerinde yapılan değişiklikleri ve bu sistemlerin farklı eğirme teknolojileri ile birleştirilmesi sonucu ortaya çıkan hibrit teknolojileri konu alan çalışmalar derlenmiş ve bu sistemlerde üretilen ipliklerin özellikleri incelenmiştir.
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