Investigation of fiber migration in rotor-jet spun yarn

The fiber migration in the newly developed rotor-jet spun yarn is investigated utilizing the tracer fiber technique and a proposed image analysis method. Effects of rotor-jet spinning parameters including three air-jet nozzle types of 90Z, 60Z, and 30Z (the values of 30, 60, and 90 are jet orifice angles and Z is air rotational direction identical to rotor rotational direction) at different air pressure values of 0.2, 0.5, 0.8, and 1 bar were considered. The results showed that increasing of air pressure causes the fiber to locate in the interior position of the yarn for 90Z nozzle, while for 30Z and 60Z nozzle types, the fiber is moved toward the exterior position of the yarn. Conversely, it was indicated that with increase of air pressure mean migration intensity and migration frequency increase for 90z nozzle, whereas decrease for 30Z and 60Z nozzle types. In general, the mean migration intensity and migration frequency magnitudes of rotor-jet spun yarn with 90z nozzle type are significantly higher than those of normal rotor yarn particularly at the higher air pressure. However, rotor-jet spun yarns with 30Z and 60Z nozzle types exhibited much lower mean migration intensity and migration frequency magnitudes than normal rotor yarn.     

第一喷嘴结构参数对喷气纱强力的影响

喷气纺纱机上第一喷嘴的结构参数主要包括喷射孔角度、喷射孔直径和喷射孔数目,为说明各主要结构参数对喷气纱强力的影响,通过试验和回归分析的方法探讨了第一喷嘴各结构参数对喷气纱强力的影响。最终得到的结论是第一喷嘴的结构参数对喷气纱强力有较大影响,当喷射孔角度为42.9°,喷射孔直径为0.4 mm,喷射孔数目为4个时,成纱强力最高。     

工艺参数对喷气纱强力的影响

阐述了纺纱速度、前罗拉钳口与第一喷嘴隔距、纺纱气压三大工艺参数对喷气纱强力的影响 ,并通过实验找出了最优的参数。     

浅谈主要工艺参数对喷气纱强力的影响

主要阐述了纺纱速度、前罗拉钳口与第一喷嘴隔距、纺纱气压三大工艺参数对喷气纱强力的影响,通过实验确定最优的参数.     

喷气纺第二喷嘴结构参数的研究

喷气纺第二喷嘴的结构参数主要包括喷嘴长度、喷嘴内径、喷孔角度、喷孔数目、喷孔直径和吸入口内径等,分析讨论了各参数与成纱强力的关系,并通过实验找出了较优的参数。     

浅谈三大工艺参数对喷气纱强力的影响

阐述了纺纱速度、前罗拉钳口与第一喷嘴隔距、纺纱气压三大工艺参数对喷气纱强力的影响,并通过实验找出了最优的参数     

影响喷气纺纱线强力的因素

主要从喷气纺成纱条件、成纱过程、成纱结构等方面分析了影响喷气纱强力的因素。     

转杯纺苎麻棉混纺纱的工艺优化

分析了纺杯速度、工艺风压、分梳辊速度对苎麻棉转杯纱成纱质量的影响,通过正交试验对工艺参数进行了优化。53tex苎麻75／棉25特杯砂的性能测试结果表明：纺杯速度对转杯纺苎麻棉混纺纱的断裂强度、断裂伸长率、强力CV值、条干CV值影响显著;分梳辊速度对强力CV值 、最小强度、结杂粒数影响显著;工艺排风风压对条干CV值影响显著。综合考虑转杯纱各项性能,选择纺杯速度55000r／min、分梳辊速度9000r／rain、工艺排风风压1200Pa为最佳工艺组舍。     

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.     

Effect of the distance between jet orifice and nozzle Alex on properties of vortex spun yarn

This study focuses on the effect of various distances between the jet orifice and the nozzle Alex on the properties of the vortex spun yarn. Four levels of the distance are designed within certain range. Building three-dimensional computational fluid dynamics models, we use the method of numerical simulation to calculate the inner fluid field of nozzle. The results showed that the distance typically affected the airflow movements, particularly in tangential velocity, and the smaller d is beneficial to diffuse the airflow uniformly and to improve the quality of vortex spun yarn. The corresponding experiments have been carried out. In this paper, 100% viscose drawing slivers are spun into vortex spun yarn, and their physical properties are tested. Spinning experiment results prove that when the distance is minimum under the condition of avoiding the high-speed airflow shooting out from the jet orifices colliding with the cone body, the yarn strength reaches the maximum value, while the unevenness of breaking strength meets the minimum, and the other yarn properties are superior, which shows a good agreement with the simulation results.     

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.     

基于喷气涡流纺的Cocona纱的纺制及性能

采用喷气涡流纺将Cocona纤维和莫代尔纤维混纺制得Cocona/莫代尔纱。测试分析了Cocona纤维和Cocona/莫代尔纱的基本性能以及Cocona/莫代尔纱的织造性能。试验结果表明：Cocona纤维的细度较小,为2.79 dtex,断裂强力较差,为2.03 cN/dtex,摩擦性能一般,不适合直接纺纱;Cocona/莫代尔纱细度为130 dtex,断裂强度为4.137 cN/dtex,条干均匀度较好,毛羽少,织造性能良好。     

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...     

Effect of rotor spinning transfer channel modification on fiber orientation and yarn properties

The vortices are generated at the conventional transfer channel, having adverse effects on fiber configuration. In a former research, a conventional transfer channel was modified via rounding the transfer channel inlet corner and adding a bypass channel. The simulation results obtained with the modified transfer channel showed that the vortices were eliminated and the inlet air velocity increased. We present the impact of this modification on the yarn properties and fiber straightness. Four groups of yarn samples were spun using the conventional and modified spinning system. Yarn properties and fiber straightness along the rotor groove were evaluated. Results revealed that tenacities of the yarns spun on the modified system, increased in comparison to that of the conventionally spun yarns. The number of nearly straight fibers is increased by 25.55% by using the modified system, which was mainly attributed to the decrease in the number of fibers with trailing and leading hooks.     

喷气纺14.06 tex天丝纱的生产实践

文章结合天丝的物理性能介绍了在喷气纺纱机上生产14．06 tex天丝纱的纺纱方法,重点介绍了该方法的工艺流程和主要参数,并对成纱的性能指标作了分析,试验结果表明该方法可以应用到实际生产中。     

库思玛纤维/精梳棉赛络纺针织纱的开发

库思玛纤维是一种十字型截面、具有吸湿快干功能的涤纶纤维,用其制成的面料穿着挺刮,高雅华丽,色彩鲜艳,还具有吸湿快干的特点,被广泛应用于运动服装.但其质量比电阻大,易起静电,生产难度高,在开清棉前需进行特殊预处理;与精梳细绒棉混纺时采用条混工艺,严格控制混纺比;赛络纺产品在细纱工序要注意牵伸通道的两根须条必须平行,保证库思玛纤维与精梳细绒棉混纺针织纱质量的稳定.     

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。     

Optimization of spinning parameters influencing the hairiness properties of polyester/cotton vortex yarn

The influence of vortex spinning parameters on the hairiness properties of polyester/cotton vortex yarn has been studied. Polyester/cotton yarn of 50:50 blend ratio has been produced in two different counts (Ne 20s and Ne 40s) each with four different spinning parameters (delivery speed, spindle size, feed ratio and nozzle pressure). Experiments are designed with the aid of response surface method. Accordingly, different samples are produced with three levels of each parameter. The hairiness index H and zweigle hairiness have been evaluated from the samples produced with these combinations. It is found that the hairiness index H of both coarser and medium count vortex yarns are influenced by all the spinning parameters considered for this study. Also, zweigle S3 values of both coarser and medium count vortex yarns are influenced by all the four parameters. The interactions of some of the spinning parameters have significant influence on the hairiness index, H of both coarser and medium count vortex yarn. Also, few of the interactions have significant influence on zweigle S3 values of both coarser and medium count vortex yarns.     

不同纺纱参数对双喷嘴假捻纱成纱结构的影响

比较和分析了双喷嘴喷气纱和涡流纱的差异。纱线强度主要是包缠纤维比例的函数。试验证明纤维在第二喷嘴成纱。第二喷嘴形成的捻度向后传递到牵伸系统,并抵消了第一喷嘴造成的反向捻度。通过调整入口的几何位置、喷嘴压力和纤维喂入的设计参数,可以对加捻三角区产生积极的影响,并可达到提高输出速度的效果。通过这些方法可略微改善成纱结构及性能。     

喷气织机辅助喷嘴流场特性分析与纬纱牵引实验研究

为了进一步研究喷气织机辅助喷嘴的流场特性,本文利用三维软件Pro/Engineer建立了辅助喷嘴流场的三维模型,并利用计算流体动力学软件Fluent对辅助喷嘴引纬流场进行数值模拟,得到不同供气压力条件下辅助喷嘴出口射流中心线上的速度曲线。为了验证数值模拟的合理性,本文通过实验获取了不同供气压力条件下各种辅助喷嘴出口气流流速中心线上不同位置的速度值,并将实验数据与数值模拟进行比较。结果表明,实验所得数据的速度变化总体趋势与数值模拟得到的速度曲线基本一致。在一定程度上,很好地验证了运用Fluent对辅助喷嘴引纬流场进行数值模拟的可行性。最后,本文分别以两种辅助喷嘴为研究对象对不同种类纬纱的牵引作用进行实验测试。结论表明：单孔辅助喷嘴具有射流强度大、稳定性高、集束性好等特性。