This study aims to investigate mechanical properties of woven fabrics made from 100 % lyocell, combed cotton and lyocell-cotton blended yarns with different blend ratios. For this purpose, the tensile properties, tearing force, abrasion resistance, bending rigidity, drapability and wrinkle resistant properties of woven fabrics made from different ratios of lyocell and cotton yarns were tested. All the tests were carried out according to the standards, and the results obtained were assessed statistically. The analyses of variance were carried out at 5% (0.05) level of significance. The results of the study show that the effects of the proportion of the lyocell fibres in the lyocell/cotton blended yarns on the tensile properties, tearing force, abrasion resistance, bending rigidity and drape coefficient of woven fabrics are of statistical significance, and it was found that the tensile properties, tearing force and drapability properties were observed to be improve with the increase of lyocell fibre proportion in the blend.
Bu çalıĢmada farklı oranlarda üretilen tencel pamuk karıĢımı ipliklerin performans özelliklerinin incelenmesi amaçlanmıĢtır. Bu amaçla beĢ farklı karıĢım oranında (%25-%75, %50-%50, %75-%25 tencel-pamuk, %100 tencel ve % 100 penye pamuk) aynı büküm ve doğrusal yoğunluğa sahip iplikler aynı üretim hattında üretilmiĢlerdir. Üretilen ipliklerin mukavemet özellikleri (kopma kuvveti, kopma mukavemeti, kopma uzaması, kopma iĢi), düzgünsüzlük, tüylülük, ince-kalın yer, büküm canlılığı ve bobin sertliği değerleri standartlara uygun bir Ģekilde ölçülmüĢtür. ÇalıĢma sonucunda karıĢımdaki tencel lif oranının ipliklerin mukavemet özelliklerine ve düzgünsüzlük özelliklerine etkisinin istatiksel olarak anlamlı olduğu ve karıĢımdaki tencel oranı arttıkça ipliklerin kopma yükü, kopma uzaması, kopma mukavemeti, kopma iĢi değerlerinin arttığı; % Um, % Cvm, ince-kalın yer sayısının ve neps değerlerinin ise azaldığı görülmüĢtür.
In this study, the effects of vacuum steaming process parameters on physical properties, tensile properties and twist liveliness values of spun and filament 100% polyester yarns were investigated. For this purpose, yarns having different twisting coefficients and different numbers were twisted, and afterwards they were exposed to vacuum steaming at different temperatures and for different durations. Linear density, hairiness, unevenness values, tensile properties and twist liveliness of these yarns were measured before and after vacuum steaming. The results obtained were assessed by means of COSTAT and SPSS statistical analysis programs and variation analysis, and Student–Newman–Keuls tests were carried out at 5% (0.05) level of significance. The results of this study indicate that the effects of vacuum steaming temperature and duration on tensile properties, unevenness, hairiness and twist liveliness of spun polyester yarns, and tensile properties and twist liveliness of filament polyester yarns, are statistically significant.
This study aimed to investigate the comfort and physical properties of raw and finished knitted fabrics made of yarns with different Tencel/cotton blend ratios. For this purpose, Ne 20 yarns were produced with the same twist coefficient on the same production line. Fabric samples were produced on the same knitting machine. The raw fabrics were subjected to two different combined enzymatic pre-treatments and dyeing processes. In the first process, enzymatic defibrillation and dyeing were carried out in the same bath. In the second, enzymatic bleach clean-up, defibrillation and dyeing were conducted in the same bath. The comfort and physical properties of all the raw and finished fabric samples were measured according to the relevant standards. The results were assessed statistically. The results of this study showed that with increased percentage of Tencel in the blend, the water vapor and air permeability, fabric roughness, pilling, thermal absorption and loss of mass values of the fabrics increased, whereas thermal conductivity values decreased. It was observed that the fabrics which were subjected to enzymatic defibrillation and dyeing processes in a single bath gave lower surface roughness and abrasion values but higher air permeability values; while those subjected to enzymatic bleach clean-up, defibrillation and dyeing in a single bath gave higher thermal conductivity and thermal absorptivity values. Comparison of the two processes showed that there were no significant differences in the pilling and the water vapor permeability values obtained from both processes.
Today, people’s expectations of cars have changed because they travel more frequently and take much longer trips in their automobiles. Therefore, auto manufacturers have come to realize that comfort properties of automobiles should be improved in addition to their mechanical, technical and aesthetical properties. This study aimed to investigate the thermophysiological properties of the automotive upholstery woven fabrics produced with different blend ratios of flame resistant meta-aramid and wool yarns. For this purpose, twenty-eight automotive upholstery woven fabric samples were produced using two different weaving patterns and different blend ratios of flame resistant meta-aramid and wool yarns. Thermophysiological properties of the samples such as water vapor permeabilities, air permeabilities and thermal conductivities were measured, and their burning behaviours were tested according to the standards. The results obtained in this study were assessed by means of statistical methods, and the results of the statistical analysis showed that blending ratios of flame resistant meta-aramid and wool fiber had statistically significant effects on both the thermo-physiological properties and burning behaviours of automotive upholstery fabrics. This study showed that the thermal comfort values of the automotive upholstery fabrics of different meta-aramid/wool blend ratios were very close to one another. In addition, the air permeability values of these fabrics were increased with the increase of the meta-aramid content in the blend. The blends containing 25% meta-aramid fiber exhibited the highest increases in air permeability values of the fabrics. Besides, the blend of 25% meta-aramid and 75% wool fiber was found to be the optimal blending ratio in terms of the total burning time after the removal of the ignition source. Therefore, it can be concluded that thermo-physiological comfort properties and burning behaviours of automotive upholstery fabrics can be improved by using the blends with different meta-aramid contents, depending on desired fire performance levels and thermophysical properties.
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