Effect of polyester and elastane linear density on the physical and mechanical properties of dual-core-spun cotton yarns

ABSTRACT

The use of single-core elastic spun cotton yarns is well established in textiles and denim industry but interest in the use of dual-core-spun yarns has started to grow only recently. The aim of this study was to investigate the effect of polyester and elastane linear density on the physical and mechanical properties of dual-core-spun cotton yarns. Yarn samples were prepared on industrial-scale spinning machines using cotton as the sheath fibers and two different linear densities of polyester and three different linear densities of elastane filaments in the core. Statistical analysis of the results revealed that yarn tenacity, elongation, uniformity, and hairiness are significantly affected by the linear densities of both the polyester and elastane filaments in the core, with statistically significant interaction between them. Yarn imperfections (IPI), however, are affected mainly by the polyester denier, while the elastane linear density did not show statistically significant effect on the IPI. Regression equations for different yarn properties were also developed which showed fairly high values of coefficient of determination (R-sq).     

Effect of elastane linear density and draft ratio on the physical and mechanical properties of core-spun cotton yarns

The aim of this study was to investigate the effect of elastane linear density and draft ratio on the physical and mechanical properties of core-spun yarns. Twenty yarn samples were prepared on industrial scale in a spinning mill with two different yarn linear densities, each with different two elastane deniers and five draft ratios. It was found that core-spun yarn’s tenacity, elongation and hairiness are affected not only by the overall yarn linear density but also by the elastane linear density and the draft ratio. However, the effect of elastane linear density and draft ratio was not found to be statistically significant on the yarn mass variations and total imperfections, which are only affected by the overall yarn liner density. A statistically significant interaction for yarn elongation at break was found between the yarn liner density and the elastane linear density concluding that elastane linear density used in the core must be compatible with the overall yarn liner density for attaining the best yarn elongation.     

弹性纤维在转杯纺中的应用

在经过改进的转杯纺纱机上引入弹性纤维以生产不同类型的弹性转杯纱.分析了转杯速度、牵伸倍数、捻系数对弹性转杯纱性能的影响,并通过正交试验对工艺参数进行了优化.这三个参数对弹性转杯纱的性能都有较大的影响,其中牵伸倍数的影响最大.弹性纤维在转杯纱中与棉纤维纱条捻合成纱.与常规转杯纱相比,弹性转杯纱的表面更加规则和光洁,主要性能也得到了改善.     

氨纶在粗纺细纱机上的应用及粗纺氨纶包芯纱性能的研究

氨纶已经成功应用于改装过的精纺系统用来纺制弹性包芯纱,但由于精纺系统同粗纺系统在牵伸装置上存在较大差异,所以无法在毛粗纺系统上应用相同的改装设备来纺制毛粗纺氨纶包芯纱.介绍了一种在毛粗纺系统中引入氨纶的方法,以此方法纺制出的包芯纱具有良好的外观和品质.进行了一系列试验来研究氨纶的牵伸倍数和纱线捻系数对包芯纱拉伸性能和弹性的影响.结果显示,当氨纶牵伸倍数为2.5,捻系数为13.63时,包芯纱的强度和断裂伸长值最大.     

Influence of Dorlastan® draft and yarn count on the elastic recovery of the Dorlastan® core spun yarns following cyclic test

Elastic recovery is one of the most important mechanical properties especially of clothing applications. This property is more and more significant when the textile structure contains elastane filament and has significant elasticity. In this study, we investigate the effect of the Dorlastan® draft and yarn count on the elastic recovery of cotton-covered Dorlastan® core spun yarns. These yarns are used as weft yarns in denim fabrics. Dorlastan® core spun yarns with different counts 100, 50, and 25 tex, with different elastane drawings and with the same twist factor are used. Our test results revealed that the Dorlastan® ratio and yarn count are important factors in influencing the elastic recovery.     

Study of the mechanical behaviour of the elastic-core-spun yarns

The elastane-core-spun yarns are hard to be controlled because of the absence of specific tests. Therefore, this study is aims to determine the appropriate conditions to test the mechanical behaviour in term of tensile and relaxation tests. In the present study, cotton-covered elastane-core-spun yarns were used with the same twist factor and various elastane draft values. The analytical results showed that the pretension necessary to deploy the elastic-core-spun yarn increases while the elastane draft increases. Moreover, the elastane ratios have an important effect on the yarn properties for different tests, especially the tensile and the relaxation tests. Besides, the experimental conditions such as the extension rate and the specimen length have a great influence on the mechanical properties.     

A comparative study on performance characteristics of multicomponent core-spun yarns containing cotton/PET/elastane

Abstract

This paper experimentally investigated the characteristics of different (filament and multicomponent) core-spun yarn type. Filament core-spun yarns comprised cotton covered drawn textured (DTY) polyester (PET) filaments with four different filament finenesses. Regarding the production of multicomponent (dual) core-spun yarns, both PET with four different filament finenesses and elastane with four levels of draft variable were fed simultaneously. Yarn samples were produced with modified ring spinning system at the same spinning conditions. As a control group, 100% cotton ring-spun yarn was also manufactured. Tensile properties, unevenness, imperfections and hairiness of yarn samples were determined. Also, fatigue characteristics of yarn samples were examined at two different loading of cycles. The results showed that filament fineness had a significant effect on all yarn properties being determined. Dynamic modulus and dynamic strain properties of yarns, filament fineness, elastane draft and number of cycle were found to be statistically significant at 0.05 level.     

莫代尔弹性包芯纱纬编产品

传统的添纱技术作为一种标准的编织方法在市场上已有一定的份额。实际上，添纱组织是由两个单独的线圈，即两组单独的纱线组成。本文介绍的包芯纱添纱产品的莫代尔纱由Lenzing公司提供，弹性裸丝由Lenzing澳洲公司提供。这种包芯纱能使织物具有永久弹性。莫代尔纱线位于织物的外面，即针织物的正面，而弹性纱作为添纱位于织物的反面。     

弹性织物中的应力/应变性能变化

对各种类型的弹力纱进行比较,并根据应用领域阐述其性能和特征。     

摩擦纺包芯纱织物性能测试分析

对棉包涤纶长丝摩擦纱、棉包锦纶高弹丝摩擦纱、棉包锦纶全牵伸丝摩擦纱以及棉包粘胶长丝摩擦纱四种平纹织物的性能进行了试验研究 ,并将它们与纯棉环锭纱和纯棉摩擦纱的平纹织物的性能进行了比较分析。研究结果表明 ,棉包涤纶长丝摩擦纱织物和棉包锦纶高弹丝摩擦纱织物在服用、舒适等方面均优于环锭纱织物。这两种摩擦纺包芯纱织物作为服用织物具有良好的发展前景     

捻度对棉/氨纶/银丝包芯纱性能的影响

为了制备具有良好纺织特性的弹性导电纱线材料，以棉粗纱、氨纶、银丝为原料，通过设计原料的喂入方式及在环锭纺纱机的前罗拉与导纱钩之间附加定位装置，纺制以氨纶为纱芯、银丝与棉纤维螺旋包缠氨纶且棉纤维位于纱线表面的弹性导电包芯纱，探究捻度对纱线弹性、导电性、耐磨性和断裂强力的影响。以银丝紧贴氨纶表面包缠为模型，计算得到不同捻度下包芯纱中紧贴氨纶表面包缠的银丝长度的理论值。实验结果表明：包芯纱的弹性随捻度变化，在70捻/(10 cm)时包芯纱定伸长伸长弹性率、定负荷伸长弹性率较大；在包芯纱伸直(不伸长)状态下，纱线实测电阻值随捻度的增大而增大；在包芯纱伸长10%的状态下其实测电阻值小于伸直状态下等长度包芯纱实测电阻值，且在75捻/(10 cm)时伸长状态与伸直状态下的相同长度包芯纱的实测电阻值之差较小。     

A Study of Various Mechanisms of Attrition of Fibres as a Result of Abrasion

This paper presents an account of an experimental study of the pure-bending and recovery properties of both continuous-filament and spun yarns. The bending behaviour of yarns is approximately represented by a simple two-element rheological model of an elastic element and a single frictional element acting in parallel. The use of this model allows the bending deformation to be separated into an elastic and a frictional component, measured by the flexural rigidity and the frictional (or coercive) bending moment, respectively. An expression for the frictional couple in yarn-bending is derived from consideration of the lateral forces acting within the yarn and the degree of set of fibres in a twisted yarn. Bending experiments were made with nylon model plied yarns, conventional multifilament yarns, and staple-fibre yarns; it is shown that the level of residual fibre tension within both unset and set yarns can be estimated from the experimental values of the frictional bending moment by semi-empirical means. The mechanisms of bending for conventional polyester-fibre multifilament and worsted-spun yarns are investigated and the effects of yarn linear density, twist, and yarn-setting treatment studied. The bending behaviour of a series of wool-nylon blended-fibre yarns is also discussed in terms of the simple two-element rheological model of yarn-bending behaviour. It is shown that both the flexural rigidity and the frictional bending moment for the blended-fibre yarns can be calculated by assuming independent behaviour of the fibre during bending.     

Research on fiber distribution in front draft zone of super high draft ring spinning based on cut-middles method

A super draft ring spinning machine was designed to spin high-count cotton yarns. It was equipped with four-line draft system (FLDS) and four aprons. For yarns spun on FLDS, it often occurs that yarn unevenness increased compared with three-line draft system (TLDS). In the paper, by cut-middles method, the fiber distribution in front draft zone of FLDS draft system was studied, and corresponding yarn qualities were analyzed. First, comparison analysis of yarn quality between FLDS and TLDS was presented. Cotton yarns of 9.7 and 7.3 tex were spun by TLDS and FLDS ring spinning machine, respectively. The results shows that for 9.7 tex cotton yarn, slower fibers in yarns spun on FLDS are more than that in yarns spun on TLDS. For FLDS, the friction field at the back of front draft zone is stronger, which improves yarn evenness. However, for 7.3 tex cotton yarn, accelerated point of fibers on FLDS is nearer to nipper bite of front roller than that on TLDS. Thus, evenness of yarns spun on FLDS is better. Then, 4.9 tex cotton yarn was taken as an example, and they were spun by four kinds of draft distributions on FLDS. The results indicate that for 4.9 tex cotton yarns spun by 64.1 × 1.60 × 1.15, slower fibers at the back of front draft zone are mostly found. And accelerated point of fibers is nearest to nipper bite of front roller. Therefore, 4.9 tex cotton yarns spun by 64.1 × 1.60 × 1.15 have best yarn evenness.     

尼龙/氨纶经编针织面料环境友好染色及整理的可能性

尼龙/氨纶经编针织面料具有众多优点:如尼龙带来的高强、耐磨,氨纶带来的高弹回复性;并且该面料吸湿快干、手感柔软;用该面料缝制的服装能提供一种无压舒适感,有助于勾勒完美的体形.然而,合成纤维,尤其是氨纶织造时采用大量硅油,这给尼龙/氨纶经编针织面料加工带来困难.常规方法中,经编针织面料由传统的间歇法预整理,用高浴比溢流染...     

采用滑溜牵伸的低比例山羊绒混纺纺纱实践

针对山羊绒与羊毛长度差异较大、牵伸隔距难以确定的问题,在JWF-1516 型棉纺环锭细纱机上采用滑溜牵伸与非滑溜牵伸的方式纺制山羊绒/羊毛混纺纱、山羊绒/ 羊毛/ 桑蚕丝混纺纱,分析滑溜牵伸与非滑溜牵伸方式纺制低比例山羊绒混纺纱的线密度和纱线质量。纺纱试验结果表明：采用滑溜牵伸与非滑溜牵伸的方式,均可纺制单纱线密度为11.1 tex 的羊毛/ 山羊绒（84/16）混纺纱与羊毛/ 山羊绒（65/35）混纺纱;与非滑溜牵伸方式相比,采用滑溜牵伸方式纺制的细纱粗节与细节明显减少;采用滑溜牵伸方式,可纺制单纱线密度为10 tex 的羊毛/ 山羊绒（84/16）混纺纱（单纱条干CV 值为19%）,和单纱线密度为8.3 tex 的羊毛/ 山羊绒/ 桑蚕丝（80/10/10）混纺纱（单纱条干CV 值为18.8%）,但这2 种线密度的混纺纱用非滑溜牵伸方式不可纺。     

Elastic Recovery and Performance of Denim Fabric Prepared by Cotton/Lycra Core Spun Yarns

ABSTRACT

Elastic performance coefficient (EPC) and recovery behavior of denim fabrics prepared with cotton/lycra core spun stretch yarns have been presented in this article. The denim fabrics are woven as broken twill weaves in an air-jet weaving machine by the insertion of core spun yarns (lycra filament in core, cotton fiber on sheath) as weft and using 100% cotton yarns as warp. The effect of linear density and stretch percentage of the core spun weft yarns on tensile and recovery behavior of denim fabric have been investigated by employing full factorial design of experiments. It has been observed that the tensile strength and EPC of fabric increase with decrease in linear density and stretch percentage of the core spun stretch yarn. The immediate elastic recovery and delayed elastic recovery increase with decrease in linear density and stretch percentage of the yarns.     

Analysis of mechanical and dimensional properties of the denim fabrics produced with double-core and core-spun weft yarns with different weft densities

Elastic structures are preferred for improving the elasticity and recovery properties of denim fabrics. With the intention of improving comfort during body movements in denim jeans, 10–35% elasticity is required. In this study, the effect of the composition of double-core (dual-core) and core-spun weft yarns and weft density on the mechanical properties of denim fabrics was investigated. For this purpose, different core materials were used in the production of elastic yarns. The sheath material was cotton for all yarn types. Yarn samples were spun with the same yarn count and twist coefficient. 100% cotton Ne 8/1 Ring slub warp yarns were used as warp yarn while double-core and core-spun yarns were used as weft yarns in weaving. The weaving process was performed with three different weft density values (16, 22, and 28 weft /cm) and the other production parameters were kept constant. Twill 3/1 woven fabrics were treated according to standard denim finishing procedures. After domestic washing processes, mechanical properties of the samples were tested and statistically evaluated.     

Study of the impact of elastane's ratio and finishing process on the mechanical properties of stretch denim

The wear comfort desired by the consumer is leading to increased use of fabrics containing elastane filaments. However, the elastane's ratio is an important factor influencing the fabric's mechanical properties. Thus, we study the effect of elastane's ratio and finishing process on the elasticity of denim whose weft yarns are cotton covered elastane-core spun yarns having the same twist factor and various elastane's ratio.     

聚酰胺／弹性纤维印花织物间歇式后水洗新特点

聚酰胺／弹性纤维印花织物已大大丰富了泳装的类型，但客户不断变化的颜色和设计要求对所有的印染厂而言永远是一个挑战。描述了一种聚酰胺／弹性纤维印花织物高效水洗后加工工艺。