Influence of spinning parameters on milkweed/cotton DREF-3 yarn properties

In this study, Pergularia milkweed fibre (70%), cotton fibre (30%) core and 100% cotton fibre sheath DREF-3 core yarns of 74?tex were produced 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 production speed of 100?m/min. The effects of the core/sheath ratio on all the yarn properties are significant. With an increase in the core/sheath ratio, yarn tenacity and elongation decrease due to insufficient wrapper fibres in the yarn and yarn unevenness; imperfection increases due to higher feed rate and draft at higher core ratio. The yarn hairiness increases at higher core ratio due to higher number of short fibres in milkweed and lesser sheath fibres to cover the core fibres effectively. An increase in the spinning drum speed damages fibre in the sheath and increases the number of hooks at the end of fibres, as a result of which the core yarn tenacity decreases at higher drum speed. At a higher air suction pressure, yarn tenacity and the elongation at break increases. The drum speed and suction pressure have no significant effect on yarn unevenness and imperfections. The yarn hairiness decreases slightly with increase in drum speed and suction pressure but is insignificant.     

Application of air‐jet nozzle in short staple Siro spinning system

With the objective of reducing the hairiness of Siro spun yarns, two types of air‐jet nozzle differing in the angle of sub‐holes and suitable for an air vortex ring spinning system were designed and fabricated. The performance of the JetSiro spinning system on short staple fiber materials and the effects of the different parameters on the hairiness of JetSiro spun yarns, such as nozzle pressure of compressed air, distance between front roller nip and inlet of nozzle, and nozzle structure, were investigated using the Taguchi method. The physical properties of JetSiro spun yarns with those of conventional Siro spun yarns were compared. The results show that the parameters, air pressure and distance between front roller nip and inlet of nozzle have the strongest and weakest effect on yarn hairiness. In addition, the optimum spinning conditions were determined. The application of the air‐jet nozzle exhibits significant reductions in yarn hairiness of 40%. The results revealed no significant effect of the air‐jet nozzle on the yarn tensile properties and evenness.     

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.     

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.     

喷气涡流纺成纱工艺对竹浆纤维色纺纱性能的影响

为进一步拓展喷气涡流纺织品种及提高传统色纺纱加工效率,利用Box-Behnken设计实验方案,借助软件Minitab 16,分析喷气涡流纺工艺参数对竹浆纤维色纺纱性能的影响。结果表明：成纱工艺对色纺纱断裂强度的影响较为复杂,其中纺纱速度及纱线线密度对色纺纱断裂强度的影响受喷嘴气压不同取值影响;色纺纱条干不匀主要受纺纱速度和纱线密度影响,提高纺纱速度使纱线条干不匀先减后增,而减小纱线线密度将显著恶化色纺纱条干;色纺纱毛羽主要受喷嘴气压和纺纱速度影响,降低喷嘴气压及提高纺纱速度均会使纱线毛羽增加;色纺纱直径主要受喷嘴气压和纺纱线密度影响,增加喷嘴气压或减小纱线线密度,均会使色纺纱直径明显减小。     

旋流器对环锭纺纱线性能的影响

在传统环锭细纱机的前罗拉与导纱钩之间安装旋流器进行纺纱,能够较好地改善环锭纺纱线的性能。通过正交试验的方法,考察了气压、锭速、捻系数和旋流器到前钳口的距离对纱线质量的影响,得出优化的参数组合。结果表明：气压为0.25 MPa、旋流器到前钳口的距离为6.5 cm、捻系数为330、锭速为9000 r/min时,所纺纱线质量最好;与传统环锭纺纱线相比,这种纺纱方法所纺得的纱线毛羽减少量达到97％,断裂强度提高了9%,条干不匀降低6%,为研究提高纺纱性能的新型纺纱方法提供参考。     

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。     

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.     

旋流器纱道截面形状对环锭纺纱线质量的影响

 为了进一步优化旋流器的内部结构,更好的提高成纱的质量,本文设计并使用了两种不同截面形状纱道的旋流器来减少环锭细纱毛羽,测试了样品的毛羽、断裂强力以及条干不匀率等主要指标,分析了纱道截面形状对成纱质量的影响,并与普通环锭纺细纱质量进行了比较。结果表明：两种截面形状的旋流器均对环锭细纱的性能有较大影响。由于两种截面形状纱道内气流状态不同,二者对纱线性能的影响程度不同。相同纺纱工艺参数条件下,圆形纱道旋流器所纺纱线>3mm毛羽指标、断裂强力和条干不匀率等指标均优于椭圆形纱道旋流器。因此,旋流器的纱道截面形状选择圆形较合理。     

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.     

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。     

The new Solo-Siro spun process for worsted yarns

Abstract

The aim of this paper was to explore whether the properties of worsted yarns, especially hairiness, can be improved by combining the Solospun and Sirospun processes into a single Solo-Siro spun process. Wool fibres of 19 and 21 μm in average diameter were spun into 40 tex yarns at different twist levels, using the conventional ring, Sirospun and Solo-Siro spun systems, respectively. These yarns were then tested for a range of properties, including hairiness, tenacity, elongation and evenness, for comparison purposes. The statistical analysis results indicate that the hairiness (S3 value) of Solo-Siro spun yarns was significantly less than that of both Sirospun and normal ring spun yarns. In addition, the tenacity of the Solo-Siro spun yarns was higher than that of the normal ring spun yarns, while changes in yarn breaking elongation were not statistically significant. For the 21 μm wool, it was found that the evenness of Solo-Siro spun yarns deteriorated slightly in comparison with that of Sirospun and conventional ring spun yarns.     

精梳棉/粘胶/毛三组分MVS涡流纱的性能研究

文章主要从纱线的断裂强度、断裂伸长率、条干不匀、毛羽、耐磨等性能指标进行了分析研究,并与其他纱线尤其是环锭纱进行对比,得出除了纱线强力稍低于环锭纺以外,其它性能皆优于环锭纱的结论,显示出了涡流纱的优越性。     

The Influence of the Spinning Process,Yarn Linear Density,and Fibre Properties on the Hairiness of Ring-spun and Rotor- spun Cotton Yarns

Cotton–spun yarns from 34 staple stocks were manufactured by means of the ring–spinning process (34 yarns) and a rotor–spinning process (29 yarns) and tested for hairiness with the Shirley Hairiness Meter. For each spinning system, yarns were spun at two values of yarn linear density (15 and 30 tex for ring–spinning and 30 and 50 tex for rotor–spinning), but the twist multiplier was kept constant within the series for each spinning process.

The higher hairiness of ring–spun yarns and an increase ln hairiness with the yarn linear density were confirmed. The effect of the fibre parameters on yarn hairiness explains only about 30% of the total effect for ring–spun yarns and 40% for rotor–spun yarns. Fibre length and its uniformity are the fibre properties having the greatest influence on the hairiness of both ring– and rotor–spun yarns, the Micronaire index having only slight influence on the hairiness of ring–spun yarn.     

Investigation of the concurrent sliver-opening mechanism and unveiling features of the new dual-feed rotor spinning concept

To examine the effectiveness of the new dual-feed rotor spinning system, we performed a set of experiments to assess the influence of the opening roller type, sliver feed method, and direction of fiber feeding into the rotor on the quality of a polyester/cotton blend yarn. Six yarn samples of 58tex consisting of 55/45 polyester/cotton were prepared in this study. Their respective properties, such as tenacity, elongation at break, mass irregularity, hairiness, thick (+35%) and thin (?30%) places were tested and statistically analyzed using Minitab. ANOVA analysis showed that the tested yarn quality properties were statistically significant among groups except for thick places (+35%). Tukey’s post hoc test based on the honest significant difference was performed to determine the implication of results within groups at the value of α?=?0.05. The dual-feed blend yarn (PCLR) spun with opening roller type OK37 on the left and OK40 on the right exhibited superior yarn quality characteristics compared to other samples. Dually carded slivers yielded better yarn quality compared to simultaneously carded ones. The combing direction did not produce a clear trend on the quality of yarns. The study provides important insights into the potential of the dual-feed rotor spinning concept.     

乌拉草/棉/维纶复合纱线的开发与性能

针对乌拉草/棉/维纶赛络纺包芯纱存在毛羽较多和条干较差等问题,加装导纱器引入外包缠纱,设计一种改善其条干和减少毛羽的新型纺纱方法:改进型赛络菲尔纺。对影响纱线性能较大的纱线捻系数与导纱间距进行了实验,并以断裂强度、断裂伸长率、毛羽指数和条干均匀度为性能评价指标,对改进型赛络菲尔纺制备的乌拉草/棉/维纶复合纱的工艺进行模糊综合评价。结果表明:捻系数对纱线性能影响顺序依次为400、380、360、340;改进型赛络菲尔纺在单纱间距为10 mm,捻系数为400时,复合纱的综合性能最好,与传统赛络菲尔纺工艺制备的包芯纱对比,毛羽指数下降了73.49%,条干不匀率减小了29.05%。     

涡流纺纱线的包缠加捻对其力学性能的影响

为探究涡流纺纱线的包缠加捻与成纱力学性能的关系,从理论上分析了涡流纺纱线拉伸过程中的纤维形变与受力,详细研究了涡流压力和纺纱速度对涡流纺纱线力学性能的影响.结果表明:外层纤维螺旋包缠特性对涡流纺成纱的力学性能起着决定性作用,涡流压力和纺纱速度为影响涡流纺包缠和加捻效果的主要因素;当纺纱速度为280 m/min时,随着涡...     

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。     

复合纱体中长丝分布形态对纱线性能的影响

为研究长丝复合纺纱过程中由长丝与短纤维须条复合产生的不同纱线内部结构对纱线性能的影响,设计并建立了6种长丝复合纺纱线结构模型,分析和预测了模型对应的成纱性能,并进行实验验证,对比分析了各复合纺纱形式所得纱线的毛羽、条干、强伸性能。结果表明：相比单独的包芯结构和长丝单侧包缠结构,长丝由两侧对须条进行包缠优化了纱线结构,表现出更佳的复合纱拉伸和成纱条干性能;同时拥有长丝双侧包缠和包芯结构的复合纱,表现出最优的成纱强力和条干;较大的长丝与须条隔距与张力更有利于长丝束缚和控制纤维外露,有效降低成纱毛羽。     

亚麻/有色涤纶长丝包缠复合纱的外观与性能

为探讨亚麻/有色涤纶丝包缠复合纱的混色特征,以及包缠捻度对混色效果及复合纱性能的影响,以有色涤纶网络丝为外包缠纱,亚麻漂白纱为芯纱,纺制不同颜色和捻度的包缠复合纱;分析了复合纱的外观特征,测试了纱线的拉伸性能、条干、纱疵和毛羽。结果表明:复合纱具有麻彩外观,芯纱粗节处包缠捻度大呈色浅,细节处捻度小呈色深,复合纱沿长度方向有弱段彩效果;改变外包缠纱的包缠捻度,可改变复合纱的混色质地和颜色深度;包缠复合可提高亚麻纱的断裂强力和断裂伸长率,改善纱线条干,减少纱疵和毛羽;包缠复合纱受到拉伸作用会发生芯纱和外包缠纱不同时断裂现象,但随着包缠捻度的增大,不同时断裂的发生比率会降低。