利用喷嘴减少苎麻纱毛羽的探讨

本文从喷嘴在纺纱中的几个实例出发,根据它们产品毛羽少的共性,在苎麻纺纱实验中采用了喷嘴与环锭纺的方法,以期减少苎麻环锭纱的毛羽.     

利用喷嘴在络筒机上减少苎麻纱毛羽的研究

本文将喷嘴与络筒机相结合,对喷嘴减少苎麻纱的毛羽进行了实验研究,并研究了参数对减少毛羽的影响,实验结果表明了喷嘴中高速旋转气流对减少苎麻纱毛羽的有效性.     

苎麻／涤Sirofil纱的性能研究

对苎麻/涤Sirofil纱的性能进行了研究，并与苎麻环锭纱、Siro纱、包芯纱、plyfil纱进行了比较。结果显示，苎麻/涤Sirofil纱的性能要优于对照纱。     

苎麻/涤Sirofil纱的性能研究

对苎麻/涤Sirofil纱的性能进行了研究,并与苎麻环锭纱、Siro纱、包芯纱、plyfil纱进行了比较.结果显示,苎麻/涤Sirofil纱的性能要优于对比纱.     

苎麻织物毛羽刺痒感的力学评价

织物表面硬质毛羽是导致皮肤刺痒的主要因素，本文依据毛羽与皮肤的刺扎作用，建立单纤维轴向弯曲压缩基本模型，并利用改装后的单纤维强力仪，对苎麻纤维刷进行刺扎弯曲实验，验证了纤维束最大压缩强力与纤维形态参数间的基本关系。     

紧密纺技术在苎麻纺纱中的应用探讨

本文主要探讨紧密纺技术在苎麻纺纱领域中的应用.通过对影响苎麻紧密纺工艺参数的试验研究,以纱线毛羽、断裂强度、乌斯特条干CV值等为考核指标,优选苎麻紧密纺纱工艺.试验结果表明:将紧密纺技术应用于苎麻纺纱中,能较好减少苎麻纱毛羽,提高断裂强度,改善乌斯特条干等纱线品质指标.     

苎麻织物毛羽刺痒感的力学评价

织物表面硬质毛羽是导致皮肤刺痒的主要因素,本文依据毛羽与皮肤的刺扎作用,建立单纤维轴向弯曲压缩基本模型,并利用改装后的单纤维强力仪,对苎麻纤维刷进行刺扎弯曲实验,验证了纤维束最大压缩强力与纤维形态参数间的基本关系.     

紧密纺纱技术在苎麻生产中的应用

本文主要探讨紧密纺技术在苎麻纺织生产中的应用.实践证明,紧密纺纱装置在苎麻生产中能够使苎麻纱线毛羽大幅降低并能改善乌斯特条干各项指标及纱线强力,使苎麻纱线外观质量得到提高.同时提出了目前紧密纺装置在苎麻生产中仍存在的不足及改进建议.     

新型苎麻湿法纺纱加工技术研究

虽然2500Nm超细苎麻纤维的刚性随着支数的提高得到极大的弱化,但是由于该苎麻纤维细度仍然大于3.0d,刚度仍然较大,纯纺加工成纱毛羽仍然很多.采用新型苎麻湿法纺纱技术,解决了纯苎麻纱毛羽多的难题,为织造高品质纯苎麻面料提供具有专有特点的纱线原料.     

苎麻/壳聚糖抗菌纱喷气纺研究

对苎麻/壳聚糖(55/45) 抗菌纱,采用喷气纺纺制的可行性进行了探讨,结果表明通过对喷嘴的设计,选取优化后的工艺参数,同时,喷气纱具有较佳的纱线结构及良好的抗菌性.     

牵切苎麻在棉纺设备上的纺纱初探

对苎麻长麻纺（复精梳）工艺中的苎麻预并条和头道精梳条进行牵切,然后分别将其在棉纺设备上进行并条、粗纱和细纱加工。探讨牵切纱断裂强度与捻系数的相互关系,并对比分析牵切纱与常规纱的质量。结果表明,牵切纱临界捻系数αt 在405左右,苎麻牵切精梳纱的条干、粗细节、棉结及3 mm以上的毛羽与苎麻常规精梳纱的接近,且断裂强度优于苎麻常规精梳纱的。     

用喷气-环锭和喷气-络筒技术减少麻纱线毛羽的研究

喷气-环锭和喷气-络筒是一种简单、低成本的减少纱线毛羽的新方法。我们对其进行理论和实验研究。采用数值模拟的方法，对毛羽在喷嘴内的运动进行模拟，说明了利用喷嘴减少毛羽的机理。根据数值模拟的结果，我们预测了喷嘴参数对减少毛羽的影响，并以麻纱为对象，用实验的方法研究了喷气-环锭和喷气-络筒技术对减少纱线毛羽的效果以及参数影响，实验与理论研究的结果相符。     

Studies on reduction of yarn hairiness by nozzles in ring spinning and winding by airflow simulation

Reduction of yarn hairiness by nozzles in ring spinning and winding is a new approach. Simulation of the airflow pattern inside the nozzles provides useful information about actual mechanism of hairiness reduction. The swirling air current inside the nozzles is capable of wrapping the protruding hairs around the yarn body, thereby reducing yarn hairiness. Since production rate of winding is very high and the process itself increases yarn hairiness any method to reduce the hairiness of yarns at this stage is a novel approach. A CFD (computational fluid dynamics) model has been developed to simulate the airflow pattern inside the nozzles using Fluent 6.1 software. In this study, both S- and Z-type nozzles having an axial angle of 50° and diameter of 2.2 mm were used for simulation studies. To create a swirling effect, four air holes of 0.4 mm diameter are made tangential to the inner walls of the nozzles. S- and Z-twisted yarns of 30 tex were spun with and without nozzles and were tested for hairiness, tensile and evenness properties. The total number of hairs equal to or exceeding 3 mm (i.e. the S3 values) for yarn spun with nozzle is nearly 49–51 % less than that of ring yarns in case of nozzle-ring spinning, and 15 % less in case of nozzle-winding, while both the yarn types show little difference in evenness and tensile properties. Upward airflow gives best results in terms of hairiness reduction for nozzle-ring and nozzle wound yarns compared to ring yarns. Yarn passing through the centre of the nozzle shows maximum reduction in S3 values.     

苎麻／壳聚糖抗菌纱喷气纺研究

对苎麻/壳聚糖(55/45)抗菌纱,采用喷气纺纺制的可行性进行了探讨,结果表明:通过对喷嘴的设计,选取优化后的工艺参数,同时,喷气纱具有较佳的纱线结构及良好的抗菌性。     

An experimental investigation of yarn tension in simulated ring spinning

Yarn tension is a key factor that affects the efficiency of a ring spinning system. In this paper, a specially constructed rig, which can rotate a yarn at a high speed without inserting any real twist into the yarn, was used to simulate a ring spinning process. Yarn tension was measured at the guide-eye during the simulated spinning of different yarns at various balloon heights and with varying yarn length in the balloon. The effect of balloon shape, yarn hairiness and thickness, and yarn rotating speed, on the measured yarn tension, was examined. The results indicate that the collapse of balloon shape from single loop to double loop, or from double loop to triple etc, lead to sudden reduction in yarn tension. Under otherwise identical conditions, a longer length of yarn in the balloon gives a lower yarn tension at the guide-eye. In addition, thicker yarns and/or more hairy yarns generate a higher tension in the yarn, due to the increased air drag acting on the thicker or more hairy yarns.     

Yarn setting and hairiness reduction with a steam jet during winding

This paper examines the use of pressurized steam for wrapping and setting the yarn hairs concurrently via a new steam-jet process during winding. Yarn torque can also be stabilized as an added advantage. The results obtained with two batches of pure wool yarns suggest that there is potential to achieve yarn hairiness reduction of up to 60 % with minimum deterioration in hairiness even after subsequent rewinding.     

混纺比对麻涤纱线性能的影响

本文通过对不同混纺比下的麻涤混纺纱的性能测试分析得出：涤纶比例必须达到一定量（40％）后，混纺纱的断裂伸长率才能随着涤纶比列的提高而逐渐改善；随着混纺比的改变，在涤纶含量为50％左右，混纺纱的断裂强力将出现一个低谷；随着涤纶含量的增加，毛羽和条干指标得以改善。