Modelling of Two-component Yarns Part I: The Compressibility of Yarns

This paper considers the compression properties of yarns. A model is proposed which predicts the behaviour of yarns in compression; the model takes account of the structural characteristics of yarns and the finite dimensions of fibres. A device is described which has been successfully used to measure the effects of compression forces on the dimensions of yarn cross-sections.

A comparison between the theoretical behaviour of yarns and experimental results demonstrates the good predictive ability of the theory.     

New computer geometric modeling approach with filament assembly model for two-ply yarns structures

This article presents a new computer geometric modelling approach for three-dimensional of two-ply yarn structures with filament assembly model. The geometric of individual filaments in two-ply yarn structures with uncompressed and compressed states were studied. In the uncompressed state the filaments in ply yarns have the form of coaxial double wound helices; we simulate the paths of these filaments in the ply yarns. In the compressed state the transformation of the initial filament distribution from the uncompressed state into the distribution after compression by a transverse force. The ply yarns cross-section uses the concept of virtual locations to simulate the filament distributions. Each cross-section is rotated along the single yarn and the ply yarn length. The curve of each filament in each two successive cross-sections is approximated by NURBS and then each curve is created by sweeping a closed curve along the centerline of the single yarn and ply yarn path. The method described is demonstrated in the uncompressed and compressed state of two-ply yarns by the CAD model using geometric parameters of the double-rove acrylic-fiber yarns. The simulation using this approach can demonstrate more realistic and improved visual simulations of real two-ply yarns.     

粘胶喷气涡流纱与环锭纱的性能对比分析

用细度1.67 tex长度分别为32、34、36、38、40 mm的粘胶纤维纺制了MVS纱和环锭纱,测试对比所纺纱线的拉伸性能、毛羽和成纱质量,结果表明MVS纱的断裂强度略低于环锭纱,成纱质量较环锭纱差,粗细节和棉结多,毛羽少。     

A Study on Wicking in Natural Staple Yarns

In this study, natural staple yarns of cotton and wool were investigated for wicking properties. Fibre packing density reflected by yarn wicking rates was measured in ply cotton yarns. It was seen that with the samples measured in this work, both twist level and number of ply in a yarn can affect yarn wicking behavior. When twist and yarn count remained unchanged, wool yarns with different fibre diameters were measured for wicking rates and the best wicking was found on the yarn with the coarsest fibre diameter. Comparison was made in this work on the treatment methods, and on both synthetic continuous filament yarns and the natural staple yarns. While prewash treatment could improve yarn wicking by changing fibre surface condition, plasma treatment was a more effective way in increasing yarn wicking rate for both filament yarns and staple yarns.     

A Relation between Machine Gauge and Linear Density for Knitting Yarns

Previous investigators of the theory of balloon formation in over-end unwinding of yarn from cylindrical packages have made the simplifying assumption that the yarn is inextensible. In this paper, the balloon equations for a linear elastic yarn are derived, and numerical solutions of these equations for small values of the elastic parameter are presented. It is concluded that the inclusion of elasticity in the theoretical model leads to a decrease in the tension in the balloon and a decrease in the balloon radius. However, for the range of elastic parameters encountered in real yarns, this effect is very slight.     

花式纱线新产品及控制装置

1改造细纱机纺制粗细纱 粗细纱是市场上一种新型纱线.外形上,粗细纱与竹节纱有相似之处,不同的是,竹节纱粗节部分的捻系数总是大于细节的捻系数,而且粗节与细节捻系数的比值只与粗段和细段的支数有关.而粗细纱粗节和细节部分的捻系数则可以按照客户的需求进行任意设定,此外,粗细纱一般是由较长片段的粗细节构成.粗细纱织物会产生自然不规则的薄厚效应,形成云斑,其外观新颖,特色突出.     

A Study of the Fundamental Parameters of Some Fancy Yarns

A study is made of the fundamental parameters involved in the production of certain fancy yarns. It is shown how use of these parameters enables an existing fancy yarn to be reproduced without resorting to empirical methods and new yarns exhpirical special pre–selected effects to be created. The method developed is then applied to slub, boucl[tacute], and “puff” yarns.     

花式纱线的产品开发

文章从花式结构、原料组分、颜色、后处理、工艺设置等5方面对花式纱线的,入内涵作了诠释,并从加工方法、复合型产品及新原料的开发应用发表了一些看法,同时借助3组纱样进行产品开发的实例介绍,对进一步拓展企业研发人员设计思路,指导实际生产起到一定作用。     

纯棉高支丝光绞纱的染整加工方法

利用意大利纱线漂染机,对已丝光的纯棉高支纱线进行了煮染一浴工艺的尝试,用于解决和提升高支纱线的强力。     

不同纤度桑蚕膨松丝的性能研究

桑蚕膨松丝是一种品质优良的新形质生丝,其丝质具有良好的膨忪性与柔软性,本文主要比较不同纤度的桑蚕膨松丝与普通生丝的缫丝成绩、膨松度、柔软性等性能差异,并研究了纤度不同的桑蚕膨松丝与其丝质的关系。     

Thickness Measurements on Two-fold Worsted Yarns—Reply

A scaled-up model of the air-jet has recently thrown more light on the mechanism of the process and on the construction of bulked yarns of the Taslan type. This in turn has led to a mechanical method of simulating the air-jet action. The simulation of the process has been so effective that yarns of the air-jet-bulked type can now be produced by a novel method that does not use the air-jet. The apparatus is described, together with certain processing requirements found necessary for maintaining product quality.

The new process is analysed mathematically, and comments are made regarding its feasibility as a possible commercial method of making yarns of the air-textured type without using compressed air.     

减少纱线毛羽的试验分析

通过大量试验和测试，分析了细纱和络筒工序影响毛羽的有关工艺参数和器材，为进一步减少纱线毛羽提供一定的参数依据。     

KoSa持久阻燃的高强聚酯长丝

介绍了KoSa公司开发的持久阻燃的高强聚酯长丝。该纤维具有多种优良的性能，是普通高科技纤维和常规阻燃处理纤维的较理想的替代品。     

莫代尔弹性包芯纱纬编产品

传统的添纱技术作为一种标准的编织方法在市场上已有一定的份额。实际上，添纱组织是由两个单独的线圈，即两组单独的纱线组成。本文介绍的包芯纱添纱产品的莫代尔纱由Lenzing公司提供，弹性裸丝由Lenzing澳洲公司提供。这种包芯纱能使织物具有永久弹性。莫代尔纱线位于织物的外面，即针织物的正面，而弹性纱作为添纱位于织物的反面。     

环锭纱与转杯纱的结构差异及其对织物的影响

通过显微镜可以观察到：环锭纱的结构与转杯纱完全不同。表现在纤维被束缚进入纱体的方式各异且各纤维的取向和顺直度不同。这些结构上的差异是由不同的环锭和气流纺纱工艺特点所造成的，但也会由纺织品应用时对纱线的误解所形成。     

Genetic algorithm‐based detection of the layout of color yarns

In this paper a novel method based on a genetic algorithm is proposed to recognize the layout of color yarns of yarn‐dyed fabric from the color pattern. The principle of a genetic algorithm is described first, and then the theories of roulette wheel selection method, crossover operation, and mutation operation are explained with the practical problem. Elitist selection is used to search for the correct result of the layout of color yarns. Some new chromosomes are added to the new generation in the genetic algorithm to avoid the local optimization. The repeat element of the layout of color yarns is then detected with period extraction. The repeat element of color pattern with the layout of color yarns is output together. Experiments on some color patterns recognized from actual yarn‐dyed fabrics, some color patterns simulated manually, and some color patterns including error color information of floats prove that the method proposed in this paper is effective for detecting the layout of color yarns from the color pattern of yarn‐dyed fabric, and it has a fault‐tolerance ability to some degree.     

汉麻纱线拉伸性能及条干均匀度测试分析

使用单纱强力机和纱线条干均匀度仪测试了12种纱线的拉伸性能和条干均匀度,研究了夹持器隔距、拉伸速度、纱线干湿情况以及预加张力等参数对测试指标的影响程度,对比分析了汉麻纱和其它纱线的性能差异.结果表明,与其他纤维的纱线相比较,汉麻纱线强度和强度不匀都较大,伸长率很小,伸长率不匀偏大;汉麻纱吸湿后,强度有所增加,强度不匀率变化很小;隔距、拉伸速度对强度指标有一定影响,预加张力对测试结果影响很小.汉麻纱线的粗节、细节、棉节和CV值均明显高于其他纱线.     

基于真实纱线的机织物与针织物虚拟设计

描述了一种能利用真空纱线预测和仿真显示形成的机织物或针织物的结构和外观的软件包。目的是在用机织或针织设备把纱线加工成织物的之前对织物的视觉特征和质量特征有个预先的了解。     

The Properties and Uses of Specific Hollow-spindle Yarns

A study is reported in which fancy yarns were made by the wrap-spinning process with a range of machine conditions and fibre supplies. The initial exploration identified the important control parameters and showed up characteristic yarn features. A particular bouclé-derivative yarn was especially interesting and was termed ‘terry-pile profile’. Further studies were made of the development of this yarn, which was evaluated in woven and knitted fabrics.     

Evaluation of diamond bar patterns on fabric surface using an image analysis technique

The main aim of this work is to study of the effect of yarn periodic irregularities on the plain weave fabric appearance using an image analysis method. The pattern of fabric faults was simulated using a prepared computer program. In the experimental stage, two different types of yarn were prepared. The first yarn was produced with a certain wavelength and the second yarn was prepared with a strong periodic irregularity using an open-end spinning machine. The wavelength of the open-end yarn fault was measured by using an Uster 4 automatic evenness tester. For practical examination, the yarns were used as weft in a shuttle loom machine and two types of fabrics were produced. Using image processing, the number and size of the diamond bar patterns, and also the theoretical wavelength of the weft yarn, were calculated. The wavelengths calculated theoretically were compared with the actual wavelengths of the weft yarns. The results showed an acceptable accuracy of the method.