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This study was performed in order to investigate the effects of tandem and conventional vacuum steaming on the physical properties of 100% cotton and 100% viscose yarns. The yarns with different twisting coefficients and numbers were twisted and exposed to tandem and conventional vacuum steaming at different temperatures. Tenacity, unevenness, hairiness, twist liveliness, package hardness values, and spirality of knitted fabrics produced from these yarns were measured before and after vacuum steaming. The results obtained were assessed by means of COSTAT statistical analysis program. Variation analysis and SNK test were carried out at 5% (0.05) level of significance. The findings of this study indicate that the effects of vacuum steaming methods on the tenacity, unevenness, hairiness, twist liveliness and package hardness values of yarns are statistically significant. Although the effects of tandem vacuum steaming vary depending on the temperature applied and the raw material used, decreases are observed in unevenness, hairiness, twist liveliness and package hardness values of yarns. Apolteks Textil San. Tic. A.Ş Epiriler Textil San. Tic. A.Ş

In this study, the effect of vacuum steaming temperature and time on the physical properties of polyamide (PA) 6 yarns has been investigated. Also, the effect of vacuum steaming temperature and time on twist liveliness and package hardness of PA 6 yarns has been studied and the results obtained have been evaluated using statistical methods. Further, the effect of vacuum steaming on dyeability properties of PA 6 yarns has been examined and the effect of vacuum steaming temperature and time on dye absorption properties of PA 6 yarns has been analyzed. As a result of this study, it has been seen that vacuum steaming temperature and time have significant effects on the tenacity properties, twist liveliness, package hardness, and dyeability properties of PA 6 yarns.

Chenille yarns are vulnerable to abrasion because of easy pile loss. In this study different chenille yarns were produced from sirospun and two-folded ring, 100% wool and 50% wool-50% polyester blend yarns of different fiber fineness. A yarn abrasion device was designed in order to measure the abrasion resistance of chenille yarns and the abrasion resistance of knitted fabrics made from these yarns was measured with a Martindale Abrasion tester. In addition, chenille yarns abraded for different numbers of abrasion cycles were analyzed using a computerized image analysis method to evaluate the abrasion behavior. The results were analyzed statistically. According to the results, the use of wool blends and sirospun yarns as pile materials led to an improvement in abrasion resistance. Correlation analyses confirmed strong linear relationships with high values of correlation coefficients (above 0.9) between the mass loss values obtained from abrasion tests and the abrasion coefficients of the chenille yarns obtained from image analysis.

During yarn formation by spinning, fibres are bent into approximately helical shapes and tension is created Twisted yarns tend to untwist because of this tension. When twisted yarn tension is slackened, the yarns usually get coupled as loops and twisted in the reverse direction forming snarls. This situation is called the twist liveliness of the yarn. Yarn twist liveliness properties should be taken into account during the manufacturing process, and necessary precautions should be taken in order to avoid or minimise problems likely to occur during the subsequent processes. Today setting yarn twists on vacuum steaming machines is the most widely used method of decreasing twist liveliness values of yarns in this study, the effects of vacuum steaming processes and other parameters on the twist liveliness of 100% cotton, 100% viscose and 100% polyester yarns were investigated For this purpose, yarns with different twisting coefficients and numbers were twisted and subjected to vacuum steaming at different temperatures and for different durations according to their raw material properties. Twist liveliness values of these yarns were measured before and after vacuum steaming and the results obtained were assessed by means of SPSS statistics software. Variation analyses and SNK (Student Newman Keuls Tests) tests were carried out at a 5% (0.05) level of significance. As a result of this study, it can be concluded that the vacuum steaming temperature, raw material, the amount of twist, and yarn number have a significant effect on twist liveliness values of yarns.

In this study, the effects of vacuum steaming process parameters (temperature and duration) on tenacity properties of 100% cotton and 100 % viscose yarns were studied. For this purpose, the yarns with different twisting coefficients and numbers were twisted and exposed to vacuum steaming at different temperatures and for durations appropriate to their raw material properties. Tenacity properties of the yams were measured before and after vacuum steaming. The results obtained were assessed by means of SPSS statistical analysis program. Variation analysis and SNK test were carried out at 5% (0.05) level of significance. As a result of this study, it can be inferred that vacuum steaming temperature has significant effect on tenacity properties of 100 % cotton and 100 % viscose yarns but vacuum steaming duration has been found to be statistically insignificant on tenacity properties of cotton yams, and viscose yams. Bu çalışmada vakumlu buharlama işlem parametrelerinin (sıcaklık ve süre) % 100 pamuk ve % 100 viskon ipliklerinin mukavemet özelliklerine etkileri incelenmiştir. Bu amaçla farklı numarada ve farklı büküm katsayısında bükülen ipliklere hammadde özelliklerine uygun olarak farklı sıcaklık ve sürelerde vakumlu buharlama işlemleri yapılmıştır. İpliklerin mukavemet özellikleri vakumlu buharlama işlemleri öncesinde ve sonrasında ölçülmüş ve elde edilen sonuçlar SPSS istatistik programında % 5 anlamlılık seviyesinde gerçekleştirilen varyans analizi ve SNK testleri ile değerlendirilmiştir. Yapılan bu çalışma sonucunda vakumlu buharlama sıcaklığının % 100 pamuk ve % 100 viskon ipliklerinin mukavemet özelliklerine etkisinin istatistiksel olarak önemli olduğu, vakumlu buharlama süresinin ise istatistiksel olarak önemli olmadığı bulunmuştur.

In this study, a fuzzy logic system is used to determine the effects of yarn parameters on the boiling shrinkage behaviour of chenille yarns. Chenille yarns are produced with different yarn counts, pile lengths, and twist levels on a chenille yarn machine. In the production of such yarns, the core yarn component is selected as acrylic while the pile yarn component is selected as viscose. The boiling water shrinkage of chenille yarns is measured according to a laboratory test method. Experimental data is used to establish the fuzzy logic model and construct basic principles. According to the results, chenille yarns with higher twist levels and shorter pile lengths have lower shrinkage values, and the yarn count has a significant effect on shrinkage. The comparison of the results obtained from the fuzzy logic model and the experiments shows that there is a strong linear relationship between the measured and predicted yarn shrinkage values.

The main objective of this study is to investigate the abrasion properties of upholstery fabrics from chenille yarns, comparatively using different abrasion test methods. The abrasion resistance measurements of the test samples are performed on a Martindale abrasion tester. Several abrasion test methods are employed, determination of abrasion cycle (pile abrasion started), ASTM 4158-82, EN ISO 1294 7-2 for woven fabrics and EN ISO 1294 7-2 for pile fabrics using chenille fabric samples to investigate the sensitivity of different evaluation methods to various yarn parameters. Furthermore, a chenille yarn abrasion device is used to measure abrasion resistance in the yarn form. Correlation analyses reveal the relationships between variables of yarn mass loss (016), fabric mass loss (016), and abrasion cycles (pile abrasion started, pile is fully worn off, and two threads are broken). The experimental results show that abrasion resistance of the fabrics tested are significantly affected by chenille yarn production parameters and fiber types for all the test methods employed. Evaluations are made of the practical uses of different abrasion methods.