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首页> 外文学位 >Torsional behavior of short-staple torque-balanced singles ring spun yarns and spirality of resultant knitted fabrics.
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Torsional behavior of short-staple torque-balanced singles ring spun yarns and spirality of resultant knitted fabrics.

机译：短纤维扭矩平衡单圈环锭纺纱的扭转行为和所得针织物的螺旋度。

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摘要

Spirality, the distortion in the wale lines, is one of the major quality problems of single jersey knitted fabrics. It influences not only the fabric aesthetics, but also decreases fabric utilization yield during the cutting process. Many factors cause the spirality, some associated with the yarn, and some with the knitting and other processes. Among all these factors, yarn residual torque or twist liveliness is the fundamental one. Spirality occurs when the residual torque is released. A new spinning technique had previously been developed in the laboratory to make a new Torque Balanced Singles (TBS) ring spun yarn. The TBS technique takes the advantages of the low twist yarn of a low residual torque and a higher productivity, and the high twist yarn of increased fiber migration and higher strength in one step by using a specially designed device which is similar with a pin false twister.; In this study, the spinning mechanism was closely examined and the effect of reduced triangle was investigated. An extremely high twist was introduced for increasing fiber migration and obtaining a compact yarn structure. Then the yarn was de-twisted and a low twist yarn was finally produced. The spinning triangle was also examined by using a transparent top front roller and colored rovings.; The structure of the TBS yarn was examined and compared with corresponding conventional ring spun yarns. Firstly, yarn surface was studied experimentally. Yarn diameter variation was investigated by calculating yarn diameters and observing Blackboard images; yarn surface features were demonstrated by analyzing SEM photos; and yarn surface hairiness was evaluated by using a Zweigle G566 hairiness tester. The results of these experiments indicate that the TBS yarn exhibits a greater variation of yarn diameter: in some parts of the yarn, fibers are tightly wound on the yarn body, showing a compact structure, and in some parts, the yarn demonstrates a slightly looser structure. Yarn cross-sectional structures were also studied by using the microscopy. The TBS yarn has a radial packing density pattern of a compact core which differs from its corresponding conventional ring spun yarns. This may contribute to the reduction of yarn residual torque and reinforce yarn strength. Fiber path within the TBS yarn was examined by using the tracer fiber technique. The 2-D images of the colored fibers show that the TBS yarn has more frequent fiber migrations which differ from conventional ring spun yarns. 3-D reconstruction of the fiber path demonstrates that the fiber basically follows a helical path with many migrations. Further analysis shows that a certain proportion of fiber segments have a rotational tendency whose direction is opposite to the yarn twist direction. This probably explains the reduction of yarn residual torque in another way.; A mathematical model was established based on the results of the investigation of yarn structure and the assumption that the yarns are elastic and no inter-fiber friction and viscosity. An energy method and the discrete fiber modelling principle were adopted. A series of sinuous functions was used for simulating the fiber migration, and a changeable radial packing density was adopted for representing the fiber distribution in the yarn cross-section. It was demonstrated to be possible to further reduce yarn torque by introducing an appropriate fiber migration pattern.; Several optimization experiments of the yarn modification system were conducted by using the response surface methodology. A two-step scheme was adopted. The yarn twist factor and the speed ratio were identified as the two key factors. Response surface experiments for 16Ne, 20Ne and 30Ne yarns were carried out, and optimal conditions were determined. A comparison was carried out between the optimizations of the yarns with different yarns counts (16Ne, 20Ne and 30Ne). The effect of spinning machines on the properties of the TBS yarns was evaluated by conducting t
机译：螺旋线是纵行纹的变形，是单面针织面料的主要质量问题之一。它不仅影响织物的美观，而且在切割过程中还会降低织物的利用率。许多因素会导致螺旋性，有些因素与纱线有关，有些因素与针织和其他工艺有关。在所有这些因素中，纱线残余扭矩或捻度活度是最基本的因素。释放剩余扭矩时会发生螺旋现象。实验室之前已经开发了一种新的纺纱技术，以制造新的扭矩平衡单纱（TBS）环锭纺纱。 TBS技术的优点是，通过使用类似于假捻加捻器的特殊设计的装置，一步就能获得低残留扭矩和高生产率的低捻纱，以及一步增加了纤维迁移和更高强度的高捻纱。 。;在这项研究中，仔细研究了纺丝机理并研究了减小三角形的效果。引入了极高的捻度，以增加纤维迁移并获得紧密的纱线结构。然后将纱线加捻，并最终生产出低捻纱线。还使用透明的顶部前罗拉和彩色粗纱检查了旋转的三角形。检查了TBS纱线的结构，并与相应的常规环锭纺纱线进行了比较。首先，对纱线表面进行了实验研究。通过计算纱线直径并观察Blackboard图像来研究纱线直径变化。通过扫描电镜照片证明了纱线的表面特征；使用Zweigle G566毛羽测试仪评价纱线表面的毛羽。这些实验的结果表明，TBS纱线的纱线直径变化更大：在纱线的某些部分中，纤维紧紧地缠绕在纱线主体上，显示出致密的结构，并且在某些部分中，纱线表现出稍松的状态结构体。还使用显微镜研究了纱线的横截面结构。 TBS纱具有紧密芯的径向堆积密度图案，该图案不同于其相应的常规环锭纺纱。这可能有助于降低纱线残余扭矩并增强纱线强度。通过使用示踪纤维技术检查TBS纱线内的纤维路径。彩色纤维的二维图像显示，TBS纱线比常规的环锭纺纱线具有更频繁的纤维迁移。光纤路径的3D重建表明，光纤基本上遵循螺旋路径，且具有许多迁移。进一步的分析表明，一定比例的纤维段具有旋转趋势，其方向与纱线加捻方向相反。这可能以另一种方式解释了纱线残余扭矩的降低。基于对纱线结构的研究结果并假设纱线是弹性的并且没有纤维间的摩擦和粘度的假设，建立了数学模型。采用能量法和离散纤维建模原理。使用一系列正弦函数来模拟纤维迁移，并采用可变的径向堆积密度来表示纤维在纱线横截面上的分布。事实证明，通过引入合适的纤维迁移方式可以进一步降低纱线扭矩。使用响应面方法对纱线改性系统进行了几次优化实验。采用了两步方案。确定了纱线捻度因子和速比是两个关键因素。进行了16Ne，20Ne和30Ne纱线的响应面实验，并确定了最佳条件。比较了不同支数（16Ne，20Ne和30Ne）的纱线的优化效果。纺纱机对TBS纱线性能的影响通过进行t

著录项

  • 作者

    Yang, Kun.;

  • 作者单位

    Hong Kong Polytechnic University (People's Republic of China).;

  • 授予单位 Hong Kong Polytechnic University (People's Republic of China).;
  • 学科 Textile Technology.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 253 p.
  • 总页数 253
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 轻工业、手工业;
  • 关键词

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