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The aim of this work is to determine the effect of draft ratio and twist level on core visibility ratios of dual-core yarns. For this aim, different types dual-core yarns containing PET/Elastane were produced under controlled conditions. To objectively evaluate the visual quality of the dual-core yarns, the frequency of the core filaments appearing on the yarn surfaces was counted on dyed knitted fabrics produced with these yarns by using image processing algorithm. The results showed that the draft ratio and the twist coefficient were the important factors influencing the core visibility ratios of dualcore yarns. It was found that the core covering performances of the pre-treated dual-core yarns produced with the lowest twist coefficient in the study were more incomplete than the others. Moreover, it was seen that the higher draft ratio on PET filament led to well wrapping of sheath staples to core filaments for dual-core yarns.

ÖZET: Bu çalışmada, denim kumaşlara uygulanan rinse, taş ve ağartma yıkama işlemlerinin, farklı atkı-çözgü tipleri ile üretilen denim kumaşların bazı fiziksel özellikleri üzerindeki etkileri istatistikî olarak yorumlanmıştır. Çalışma sonucunda kullanılan atkı-çözgü tipinin, yıkama işleminin ve bu iki faktörün kesişiminin kumaşların kalınlık, gramaj, renk değişimi ve hava geçirgenliği değerleri üzerinde % 95 önem seviyesinde anlamlı etkisi olduğu görülmüştür.Anahtar Kelimeler: Denim kumaş, yıkama, hava geçirgenliği, renk değişimi. THE EFFECTS OF WASHING TREATMENTS ON PHYSICAL PROPERTIES OF DENIM FABRICSABSTRACT: In this study, the effects of rinse, stone and bleaching washing treatments on some physical properties of denim fabrics, which were produced with different weft-warp types, were interpreted statistically. The results show that weft-warp type, washing treatment and interaction of these two factors have a significant influence on thickness, weight, color change and air permeability values of denim fabrics with 95% significance level.

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Yeni iplik eğirme metotları arasında, hava jetli iplik eğirme sistemleri yakaladıkları pazar payı ile dikkat çekmektedirler. Bu çalışmada, hava jetli eğirme metodu ile üretilen ipliklerden dokunan kumaşların özellikleri, eş değer şartlarda üretilen ring ipliklerden üretilen kumaşların özellikleri ile karşılaştırmalı olarak incelenmiştir. Çalışma sonucunda, hava jetli eğirme sistemleri ile üretilen ipliklerden dokunan kumaşların aşınma ve boncuklanma dayanımının ring ipliklerden mamul kumaşlara göre daha üstün özelliklere sahip oldukları görülmüştür. Ayrıca iki farklı hava jetli eğirme sistemi ile üretilen ipliklerden mamul kumaşların aşınma dayanımı, buruşmazlık ve kalınlık değerleri arasında istatistiki açıdan anlamlı bir farklılık olmadığı görülmüştür.

Dual-core yarns, which are developed to have high elasticity and strength properties at the same time in the yarn structure, have been the focus of interest in yarn sector. Considering the purpose of developing dual-core yarns, it is obvious that the breaking strength and elongation performances expected from these yarns are very important. In this paper, the twist coefficient and PET (Polyethylene terephthalate)/Elastane draft ratios of dual-core yarns were optimized by Taguchi Method for improved of breaking strength and elongation performance. The signal to noise ratio (SNR) was calculated for each output and optimum levels were determined over these ratios. As a result of the study, it was determined that PET draft was the most effective parameter for both outputs. Considering the individual optimum levels determined for each output, common factor-level combinations covering both outputs were determined. Consequently, optimal common combination for the multi-performances was found as 4.2 twist coefficient, 1.15 PET draft ratio and 3.8 elastane ratio.