Influence of Friction Spinning Process Parameters on Spinnability of Pergularia/Cotton-Blended Yarns

In this study, spinnability of Pergularia daemia seed fiber (70%) and cotton fiber (30%) core/100% cotton fiber sheath DREF-3 core yarns of 74 tex were studied using different spinning parameters in order to understand their effect on yarn properties. Box-Behnken Design was used for the optimization of core ratio, drum speed, and suction pressure and to evaluate the effects and interactions of the process variables on the yarn properties at a constant opening roller speed of 12,000 rpm and delivery rate of 100 m/min. The effect of the core/sheath ratio on yarn quality index is significant. With an increase in the core/sheath ratio, yarn tenacity, and elongation decreases due to insufficient wrapper fibers in the yarn and yarn unevenness increases due to higher feed rate and draft at higher core ratio. An increase in the spinning drum speed increases the yarn quality index up to certain range and then decreases at higher speed due to damaging of fibers in the sheath and more number of hooks at the end of fibers. At a higher air suction pressure, yarn tenacity and the elongation at break increases which ultimately increases the yarn quality index. From the regression analysis, it is observed that the drum speed and suction pressure has no significant effect on yarn unevenness.     

Influence of process parameters on properties of open-end and core-sheath friction spun acrylic yarns

The present paper is concerned with the influence of opening roller speed, difference in drum speed and suction air pressure on properties of acrylic open-end and core-sheath friction spun yarns. The results show that opening roller speed and suction air pressure have significant influence on properties of open-end friction spun yarns. In the case of core-sheath yarns, suction air pressure has influence on yarn tenacity and hairiness. However, yarn unevenness and imperfection are not significantly influenced by experimental variables. The results also show that core-sheath friction spun yarns have significantly higher yarn tenacity, modulus and work of rupture and have a lower level of yarn unevenness, imperfections, hairiness, and breaking elongation than open-end friction spun yarns.     

环锭纺和紧密纺纱线的比较研究

比较研究了以棉、聚酯纤维为原料、在不同的紧密纺系统上纺制的相应的 环锭纺和紧密纺纱线.结果表明紧密纺纱线与环锭纺纱线相比,弹性、拉伸性、耐磨性、刚度和紧密度较高,毛羽、条干不匀率和疵点较少,纱线直径较小.而且,紧密纺的弹性恢复参数比环锭纺要好得多.从改变比例的方面来说,RoCoS系统纺出来的纱线与Zinser和Suessen紧密纺系统纺出来的纱线相比较时,表现出弹性、直径和紧密度的改变量小,但是拉伸性变化大.     

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。     

Effect of key process variables on mechanical properties of blended vortex spun yarns

A study of significant factors and their interaction during vortex yarn spinning has been carried out to achieve desired mechanical properties of the polyethylene terephthalate/cotton blended yarns which can offer process and performance advantages. The key significant factors, i.e. feed ratio, air pressure and spindle size were varied in a mixed-level factorial design. The mechanical properties (count lea strength product, tenacity and elongation at break) were studied and feed ratio was found to significantly affect the tenacity and elongation at break of spun yarns. A significant effect of these parameters was observed on the diameter and hairiness of the Muratec vortex spun yarn.     

氨纶丝预牵伸倍数对弹力纱性能的影响

为了分析氨纶丝预牵伸倍数对弹力纱性能的影响,在一定的工艺设备与条件下,纺制了不同牵伸倍数的环锭弹力纱以及转杯弹力纱,通过对纱线性能进行测试和分析可知：随着氨纶丝预牵伸倍数的增大,弹力纱的断裂强度都逐渐增加;断裂伸长率会先增加后减小;条干不匀率和毛羽指数会有所恶化。     

云锦一号棉纱线结构及性能

为了研究云锦一号棉的纱线性能,分别对同特数的云锦一号棉普通环锭纱与细绒棉普通环锭纱、云锦一号棉紧密纱与细绒棉/长绒棉混纺紧密纱的线密度、捻度、毛羽、条干及一次拉伸性能进行了测试对比.结果表明:云锦一号棉纱毛羽指数较相应的细绒棉纱和细绒棉混纺纱小,断裂强度和初始模量高,断裂伸长率小,短片段更均匀,条干均匀度与相应细绒棉及...     

莫代尔紧密纱与环锭纱性能的对比研究

文章简要介绍了紧密纺的技术特点,对莫代尔纤维紧密纱的强伸性能,弹性及毛羽与传统环锭纱进行了对比,结果显示:相同号数下紧密纺比环锭纺断裂强度大,紧密纺纱技术减少了细纱产生的毛羽。在纺纱工艺相同的情况下纱线号数越大,断裂强度越大,弹性恢复率越大。     

Friction spinning machine variable and yarn structure: Configuration of fibres in yarn in relation to machine variables

This article reports detailed study on the impact of some DREF-III machine variables (i.e. opening roller speed, suction air pressure and difference in drum speed) and sliver feeding positions on configuration of fibres in the yarn. It has been observed that percentages of leading and trailing hooks are significantly influenced by the feeding position of sliver. The machine variables also found to have significant influence on fibre configuration in most of the cases. The configuration of fibres is found to be controlled by air flow characteristics inside the duct and by landing behaviour of fibres on the spinning drums. In addition, it has been found that the machine variables have least impact on configuration of core fibres.     

Effects of fiber types and blend ratios on Murata Vortex yarn properties

Murata Vortex spinning (MVS) system is one of the unconventional systems for yarn manufacturing. It is suitable for spinning of 100% cotton fibers, synthetic fibers, and cotton/synthetic fiber blends which are 1 inch or more in length. The production ranges are between Ne 15-60. Vortex yarn and fabrics have low hairiness, clear appearance, high resistance to pilling and abrasion. In this study, the vortex yarns with Ne 30 are produced in different blend ratios in Murata Vortex Spinner using carded cotton, viscose, modal, silver-added polyester (Flexsil-D2?), polyester, and nylon 6.6 fibers. Vortex spun yarns are tested to determine the yarn properties which are diameter, density, roundness (shape), unevenness, imperfection, Uster hairiness (H), Zweigle hairiness, tenacity, and elongation. The study reveals that the fiber type has quite significant effects on yarn properties. In terms of structural properties, cotton is the most negative fiber while regenerated cellulosic fibers are the most positive. As modal, nylon and polyester fiber increase yarn strength, nylon and viscose fiber increase breaking elongation. Viscose and modal reduce unevenness, imperfection and hairiness while polyester and nylon exhibit more negative effect on these properties.     

错位纺纱对成纱性能的影响

采用错位纺纱技术在DSSP-01型数字式小样细纱机上纺制不同细度不同捻向的纯棉纱,通过纱线性能测试探讨错位方向对不同粗细和不同捻向纱线成纱性能的影响.实验结果表明,错位纺纱对成纱断裂强度和成纱条干有不同程度的改善,但是错位纱的断裂伸长率降低;由于吸棉笛管和导纱钩的不匹配,错位环锭纱毛羽显著增加.     

Study of optimum spinning parameters for production of T-400/cotton core spun yarn by ring spinning

This article presents the use of quadratic general rotary unitized design method in optimization of spinning parameters of T-400/cotton core spun yarn on a ring frame. T-400 is a bicomponent filament based on sorona 3GT polymer form DuPont. An experimental design was generated using MINITAB^© 15 which included three factors and five levels. Three factors were the twist, filament draw ratio, and the spindle speed with respect to the yarn properties tested by Uster tester. The research draws clear application of quadratic general rotary unitized method on optimization, with step by step analysis of the variable factors in relation to responses. The optimum spinning parameters for hairiness, evenness, and tenacity while holding other yarn qualities as limiting factors were the following: twist value 430 TPM, filament draw ratio of 0.945, and the spindle speed of 7494 rpm.     

Dynamic analysis of spinning triangle geometry part 2: spinning triangle geometry and yarn quality

This paper examines empirical relationships between the geometrical parameters of the spinning triangle and the quality parameters of ring spun yarns. For this purpose, controlled variations in the geometry of the spinning triangle were induced using two existing modifications in the ring spinning process and by varying the yarn twist level. The geometrical parameters of the spinning triangle were measured using the clear rubber roller combined with digital image processing techniques as described in the first part of this study. The yarn quality parameters measured included yarn hairiness, strength, elongation and evenness. Yarn hairiness showed more noticeable sensitivity towards the physical shape of the spinning triangle than yarn tenacity, while yarn evenness and elongation were not significantly influenced by changes in spinning triangle geometry.     

Effect of an increase in opening roller width on quality of rotor spun yarn

Opening of fibres by opening roller (OR) in rotor spinning is one of the most influential parameters on yarn quality. In order to increase working surface of the OR, its width was increased by 25 and 50% with respect to the original width and nine samples of yarn were produced. Yarn properties tested were tenacity, strain at peak, work of rupture, evenness, imperfections, hairiness and fibre extent within the yarn structure. It was concluded from the test results that, an increase in fibre opening in lower level improves yarn quality. However, further increase in amount of fibre opening at higher level improves the quality up to a certain point, and then it deteriorates. Yarn sample B8 was the best yarn produced and was superior to the rest of the yarns.     

假捻集聚纺纱方法中基本工艺参数的作用分析

为提高棉纺环锭细纱的成纱质量,提出并介绍了假捻集聚纺纱方法.通过纺纱实验研究采用这种纺纱方法时假捻器转速比、转向以及牵伸形式对纱线条干CV值、毛羽指数、断裂强度和断裂伸长率的影响.结果表明:皮圈牵伸系统所纺纱线质量要好于简单罗拉牵伸系统;假捻器的转向要根据粗纱的捻向而定,如果粗纱为Z捻,则假捻器应为逆时针转动;假捻器转...     

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).     

再生纤维素(竹)-棉喷气纱的性能

研究了再生纤维素(竹)-棉喷气纱的特性与第一个喷嘴位置的关系。增加第一个喷嘴压力及其到前罗拉钳口的距离能增大强度、断裂伸长、弯曲刚度和不匀率,且减少纱线毛羽。而第一个喷嘴的压力是影响纱线特性的主要因素。     

丽赛纤维喷气纺纱性能研究探讨

文章采用丽赛、天丝、粘胶、棉、涤棉为原料分别进行喷气纺纱，并将喷气纱线性能进行比较，研究丽赛喷气纺的纱线强力、条干、毛羽、弯曲刚度等性能。     

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.     

从纱线质量看木棉纺纱技术进步

选取了不同时期几个有代表性的企业,用不同工艺技术和成纱方法生产的木棉混纺纱及其对比棉纱,测试纱线的条干不匀率、纱疵、单纱拉伸强度以及毛羽指数,参考最新USTER统计公报-2007、CB-T／398-2008、FZl2001-1992等纱线质量评定标准分析评价木棉混纺纱品质,结果表明随着木棉纺纱工艺技术的进一步完备,木棉混纺纱的品质有明显的提升,其中紧密纺和技术Ⅳ生产的木棉混纺纱质量接近优质棉纱水平,为拓宽木棉纤维的应用领域、提高木棉产品的质量提供了良好的技术保障。