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.     

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).     

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.     

A comparative study on properties of dual-core yarns

Core-spun yarns containing Spandex have been widely used for the production of elastic textile materials. However, it has been encountered various problems not only during the usage but also during textile processes due to its high recovery property. In order to solve these problems, multicomponent core-spun yarns called as dual-core (DC) yarns, have been developed. DC yarns can be produced on the modified ring spinning machine in two different ways. In the first method, previously combined two core yarns are fed simultaneously, whereas in the second method, two core yarns are given separately into the centre of sheath fibre bundle. In present study, it was aimed to research the effect of these production methods on yarn features. Polyester and Spandex core components and cotton wrapping fibres were brought together in both two ways and the properties of multicomponent core-spun yarns were compared with cotton ring counterparts for three different yarn counts.     

喷气涡流纺工艺对粘胶/涤纶包芯纱性能的影响

为获得更高强力的喷气涡流纺纱线,通过引入涤纶长丝制备喷气涡流纺粘胶/涤纶包芯纱。采用统计分析等方法研究了芯丝线密度、纺纱速度对喷气涡流纺粘胶/涤纶包芯纱强伸性、条干不匀和毛羽的影响规律,同时对比分析了不同纺纱条件下包芯纱的结构外观。研究结果表明：芯丝线密度、纺纱速度对喷气涡流纺粘胶/涤纶包芯纱各性能响应值有不同程度的影响;纺纱速度过高或过低均不利于包芯纱成纱的强伸性提高和条干均匀性改善,纺纱速度的增加会使毛羽H值增大;在一定范围内,增加芯丝线密度有利于包芯纱强伸性的提高,随芯丝线密度的增加,包芯纱毛羽H值减小;此外,选用较大的芯丝线密度和较高的纺纱速度时,纺制的包芯纱芯丝外露现象越明显。     

缆型包芯纱的成纱机理和性能分析

为了研究缆型包芯纱的成纱特点和性能,对普通环锭细纱机进行改造,加装一套芯纱的喂入装置和须条分割辊.然后,在改进的细纱机上纺制了3种不同细度和3种不同捻系数的缆型包芯纱,芯纱为涤纶长丝,外包棉纤维;同时在相同的纺纱工艺条件下,纺制相同细度和捻系数的普通包芯纱.测试缆型包芯纱和普通包芯纱的纱线强力、毛羽和条干均匀度.结果表明:缆型包芯纱在毛羽指标上有明显优势,3 mm以上的毛羽数量仅占到普通包芯纱的30%～46%,而断裂强力和条干均匀度均稍低于普通包芯纱.     

氨纶与双组分复合长丝/棉包芯纱的拉伸弹性

为改善传统弹力包芯纱弹性回复性能,以氨纶、双组分复合长丝(CM800)为芯纱,棉纤维为外包纤维,设计了13种弹力包芯纱。探讨氨纶预牵伸倍数、芯纱线密度和弹力包芯纱反复拉伸次数与弹性回复率之间的关系。采用纱线强伸仪测试氨纶/棉、CM800/棉和棉双丝弹力包芯纱的拉伸弹性。结果表明:氨纶的牵伸倍数越大,弹力包芯纱的弹性回复率越小;随着氨纶线密度的增加,包芯纱的弹性回复率先增加后减少;CM800线密度越小,包芯纱的弹性回复率越小;氨纶/棉、CM800/棉和棉双丝弹力包芯纱的定伸长5%和定负荷200 c N反复拉伸次数与纱线弹性回复率的关系均符合幂函数关系,且弹力包芯纱的弹性回复率随着纱线反复拉伸次数的增加而降低;CM800/棉包芯纱的弹性回复率最大,氨纶/棉包芯纱的弹性回复率最小。     

全聚赛络纺双芯纱及其弹性电磁屏蔽针织物的制备

为开发弹性回复性更强的防辐射针织物,在全聚纺细纱机上采用嵌入式纺纱方法纺制3 种不同线密度的棉/ 不锈钢/ 氨纶双芯纱和3 种对应线密度的棉/ 不锈钢包芯纱,设计织制成1+ 1罗纹组织织物,测试分析纱线的包覆效果和主要性能及织物的弹性回复性、电磁屏蔽等性能。结果表明：6 种纱线包覆效果及成纱性能均良好;相比不锈钢包芯纱线织物,双芯纱织物在弹性回复和屏蔽电磁波方面有很大的优势,达到一般性民用电磁屏蔽织物的要求且能保证人体舒适性,这种新结构纱线在全聚纺设备上生产是可行的;开发弹性电磁屏蔽织物时,不仅要合理选择长丝预牵伸倍数等工艺参数,还要考虑到织物的服用性、耐久性及生产成本。     

棉Modal锦纶赛络纺包芯纱的纺制

探讨外包纤维为精梳棉、Modal,芯纱为锦纶长丝的赛络纺包芯纱的生产工艺.介绍了锦纶丝、澳洲棉和Modal纤维的性能特点及纺纱工艺流程,通过纺纱工艺试验,针对原料性能,各工序优化配置了纺纱工艺并采取了相应的技术措施.粗纱工序采用轻定量、低速度、重加压、大隔距、较小后区牵伸和较大粗纱捻系数的工艺,细纱工序减小后区牵伸倍数,放大后区罗拉中心距.实践表明,纺制的精梳棉Modal锦纶丝赛络纺包芯纱为低弹纱,成纱质量良好.在纺制锦纶丝包芯纱时,选用的外包纤维细长、长度整齐度高,可以改善成纱条干和包覆效果,保证成纱质量.     

赛络纺棉/氨纶包芯纱工艺探讨

赛络纺棉/氨纶包芯纱既具有赛络纱条干好、毛羽少的优点,又能发挥氨纶高弹性的特点,是生产各类弹性织物的理想原料。对赛络纺棉/氨纶包芯纱的主要工艺参数(捻系数、须条间距、氨纶丝预牵伸倍数)与纱线质量(毛羽、强度、断裂伸长、条干均匀度)的关系进行了试验和优化分析,为纺制赛络纺棉/氨纶包芯纱提供了参考。     

长丝喂入位置对赛络纺包芯纱结构与性能影响

针对赛络纺包芯纱纺制过程中,长丝不同喂入位置对纱线结构和性能的影响,分别纺制了涤纶长丝在左侧粗纱须条中心、两粗纱须条中间、右侧粗纱须条中心3种结构的短纤/长丝赛络纺包芯纱.对比分析了纱线截面、成纱质量、耐磨性能、拉伸断裂过程和纱线退捻特征.结果表明:3种包芯纱中涤纶长丝均在纱线中心附近,无明显漏丝,条干均匀,毛羽较少;...     

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.     

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     

PTT弹性纱线筒子染色工艺

PTT纤维与PET、PBT同属于聚酯类产品,PTT不仅具有PET、PBT纤维的优良性能,更具有良好的回弹性和染色性能.通过分析,认为PTT弹性长丝包芯纱线及短纤维混纺纱线的筒子染色关键,是使其充分收缩,以达到适宜弹性;研究了染色后的弹性纱线,在后续生产加工过程中,因受到织造张力而失弹后,重新使其回复弹性的可行性方法;例举了PTT长丝/R长丝包芯纱的生产实践的工艺流程、工艺参数及其配方.     

聚酯长丝/棉复合纱斜纹织物的保形性及服用性能

为研究聚酯(PET)长丝/棉复合纱斜纹织物的保形性及服用性能,利用PET长丝与纯棉纱开发了3种线密度为9.8 tex的纱线,并以二上二下斜纹组织织造了4种织物。对织物进行了折皱回复性、免烫性、尺寸稳定性、悬垂性等保形性能,强伸性、拉伸弹性、顶破性等抗变形性测试,以及手感风格、透湿性、透气性等服用性能测试。对比分析了纯棉纱织物与复合纱织物的保形性与服用性能。结果表明:PET长丝/棉复合纱可改善纯棉织物的折皱回复性、悬垂性,提高免烫等级,同时又不影响织物的服用性能;包芯纱织物比包缠纱织物有更好的保形性,更高的免烫等级,是免烫衬衫面料的理想选择。     

芯丝种类对织物抗皱性及抗变形性的影响

文章采用全聚纺纺纱方式生产了JC/PET、JC/PTT、JC/SPH、JC/T400四种包芯纱和一种纯棉纱,利用这五种纱线织造了规格相同的五种机织物。分别利用客观与主观评价法,评价织物的抗皱性及平整度等级,同时测试了织物的拉伸弹性回复率,以研究芯丝种类对织物抗皱性及抗变形性的影响。结果表明:芯丝的加入可以改善纯棉织物的平整度;长丝的初始模量、弹性影响织物的抗皱等级,SPH的初始模量最高、T400的弹性回复性最好,因此JC/SPH和JC/T400包芯纱织物抗皱等级最高,可以达到3. 5级;且这两种长丝的表面均有沟槽,截面为异形,起到毛细管作用,其织物具有较好的吸湿排汗作用,是开发高保形免烫衬衫面料的理想选择。     

基于包芯纱的空芯纱加工技术

以PVA长丝或短纤为芯纱，棉纤维为外包纱生产包芯纱，并通过退维得到空芯纱，由这种空芯纱制织的织物具有许多优良的性能。文章探讨了在传统环锭细纱机上生产包芯纱，并通过退维处理得到空芯纱的加工技术；并对空芯纱织物的透气性和厚度等进行了测试与分析。     

全聚赛络包芯纱工艺优化

针对包芯纱在纺制过程中易出现“露丝”现象,将全聚纺和赛络纺技术用于纺包芯纱,通过合理设置工艺参数,改善包芯纱的包覆效果,提高纱线综合质量。本文以棉氨包芯纱为例,在经过全聚纺改造的QFA1528细纱机上加装芯丝喂入装置后分别纺制29.2tex/44.4dtex和14.6tex/44.4dtex 棉/氨纶赛络包芯纱,并选择导丝轮位置、粗纱中心距、芯丝预牵伸倍数、细纱捻系数 4 项工艺参数,采用控制变量法分别纺纱并观察包覆效果,分析对比其对包覆效果的影响。结果表明：4 项参数在一定范围内设置均不会出现“露丝”现象;导丝轮位置影响芯丝在纱线横截面中的位置,粗纱中心距、芯丝预牵伸倍数、细纱捻系数对纱线包覆效果无显著影响。     

A study on the quality of kapok blended yarns through different processing methods

In this paper, 14 types of kapok blended yarns and four types of cotton yarns manufactured through different spinning technologies and processing methods were selected in order to explore the most efficient spinning technology for kapok fiber. Four yarn characteristics were measured: yarn fineness/unevenness, yarn defects, yarn hairiness, and breaking tenacity. According to Uster Statistics 2007, GB-T/398-2008, and FZ12001-1992 standards, the analytical results of the four characteristics showed that the quality of kapok blended yarns achieved a higher level with the improvement of spinning technology. The compact spinning and processing technology IV was a preferred way to spin high-quality kapok blended yarn, which lent support to widening the application of kapok fibers in various end-use products.     

纺纱方式对织物抗皱性能及拉伸弹性的影响

为开发天然抗皱免烫衬衫面料,探讨纺纱方式对拉伸弹性及抗皱性的影响,用聚酯(PET)长丝与纯棉纱通过全聚纺、全聚纺包芯、全聚赛络纺包芯、全聚赛络纺双丝包芯、全聚纺包芯合股5种纺纱方式,开发了5种线密度为14.8 tex的纱线,并织造了相同规格的5种织物,对织物的抗皱性、尺寸稳定性、刚柔性、拉伸变形性等进行测试与分析。 结果表明:纤维的急弹性变形比例、初始模量越大,织物的弹性及折皱回复性越好;纱线的毛羽少、表面光洁、条干均匀、初始模量大,则织物抗皱性好;全聚赛络纺包芯纱、全聚纺包芯双合股纱的抗皱性、尺寸稳定性、拉伸弹性回复性均较好,织物的外观平整度均为3.5级;全聚赛络纺包芯纱比全聚纺包芯纱双合股纱生产流程短,成本低,更适合用于开发高保形免烫衬衫面料。