Person: ŞARDAĞ, SİBEL
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ŞARDAĞ
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SİBEL
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Publication Effects of vacuum steaming processes on the properties of continuous and staple polyester yarns(Sage, 2015-07-01) Şardağ, Sibel; Özdemir, Özcan; ŞARDAĞ, SİBEL; ÖZDEMİR, ÖZCAN; Uludağ Üniversitesi/Mühendislik Mimarlık Fakültesi/Tekstil Mühendisliği Bölümü; 0000-0001-9177-0059; 0000-0003-2494-6485; B-1488-2019; AAY-8629-2021In 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.Publication The effects of the combined process of enzymatic bleach clean-up, enzymatic defibrillation and dyeing on the comfort and physical properties of tencel/cotton knitted fabrics(Sage Publications Ltd, 2019-11-11) Sardağ, Sibel; ŞARDAĞ, SİBEL; Toprak, Tuba; TOPRAK ÇAVDUR, TUBA; Anis, Pervin; ANİŞ, PERVİN; Bursa Uludağ Üniversitesi/Ziraat Fakültesi/Tekstil Mühendisliği Bölümü.; 0000-0001-9177-0059; 0000-0001-8475-3197; AAH-3948-2021; B-5740-2017; AAY-8629-2021This 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.Publication Vacuum steaming processes applied to yarns, its application fields and improvements(Pamukkale Üniversitesi, 2005-01-01) Özdemir, Özcan; Sardağ, Sibel; ÖZDEMİR, ÖZCAN; ŞARDAĞ, SİBEL; Uludağ Üniversitesi/Mühendislik Mimarlık Fakültesi/Tekstil Mühendisliği Bölümü; AAY-8629-2021; HVO-2051-2023The new techniques used today focus mainly on increases in production speed. For this reason yarns to be used in high speed machines is required to be of high quality. On the other hand high speed frequently causes the degree of yarn moisture to fall minimum level. This decreases in the degree of yarn moisture have negative effects on yarn strength. Since better moisture level increases the yarn strength, yarn is worked more efficiently in weaving and knitting. However each production step in textile plants causes tension in yarn and fibre. Yarns tend to snarl in order to relax themselves. Tension and snarling may lead to problems in the following proceses, thus decreasing productivity. Therefore, the moisture content of yarns should be increased and their tension should be eleminated. In this article we have studied vacuum steaming widely used to remedy above mentioned yarn problems, its application fields and new improvements in this field.Publication Investigation of some properties of yarns and fabrics made with different blend ratios of flame-resistant fibers(Sage Publications Ltd, 2023-11-22) Sardağ, Sibel; ŞARDAĞ, SİBEL; Erkurt, Dilhan; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Tekstil Mühendisliği Bölümü.; 0000-0001-9177-0059The aim of this study was to investigate the physical properties of yarns made with different blend ratios of meta-aramid, para-aramid, flame-resistant (FR) viscose, and antistatic nylon fibers, as well as the tensile strengths and burning behaviors of fabrics made from these yarns. For this purpose, 10 different yarns of two different linear densities were produced using five different blend ratios, which are commonly used in the production of fire-resistant fabrics, and knitted fabrics were produced from these yarns, with the same knitting machine and the same production parameters. Physical properties of the yarns and tensile properties and burning characteristics of the knitted fabrics were measured according to commonly applied standards, and the results obtained were evaluated using the SPSS statistical program. The findings of this study are that the blend ratios of meta-aramid, para-aramid, FR viscose, and antistatic nylon fibers have statistically significant effects on the unevenness, humidity, and tenacity of the yarns, as well as on the tensile properties and burning characteristics of the fabrics. It was found that, with an increase of the aramid fiber ratio in the blend, the tensile values of the yarns and fabrics increased. The lowest moisture contents were recorded for 100% para-aramid yarns but the highest moisture contents were recorded for yarns whose blends contained FR viscose fibers. The yarns whose blends contained antistatic nylon fibers exhibited the greatest unevenness and the most thin and thick places and neps.Publication Thermo-physiological properties and burning behaviours of automotive upholstery fabrics woven with aramid and wool yarns(Sage, 2020-12-01) ŞardaĞ, Sibel; Türk, Medine; ŞARDAĞ, SİBEL; Türk, Medine; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Tekstil Mühendisliği Bölümü; 0000-0001-9177-0059; AAY-8629-2021; EBI-8235-2022Today, 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.Publication Investigation of mechanical properties of fabrics woven with lyocell/cotton blend yarns(Ege Univ, 2019-04-01) Bilir, Tugçe Begüm; Sardağ, Sibel; ŞARDAĞ, SİBEL; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Tekstil Mühendisliği Bölümü.; 0000-0001-9177-0059; AAY-8629-2021This 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.