Fiber Migration and Distribution of Twist at Different Radial Positions of Rotor Yarn-by Hi-Scope Video Microscope System

This paper describes systematic measurement of fiber migration and distribution pattern of twist at different radial positions of rotor spun yarn mixed tracer fiber by Hi-Scope Video Microscope System. The positions of tracer fibers were measured in three dimensions accurately, and the migration index and the twist distribution at different radial positions of rotor yarn were calculated and analyzed. This research result serves to provide useful references for further study on the structural mechanics of rotor spun yarn.

SOME END-USES OF PURE RAMIE NOIL ROTOR YARNS

In the previous studies, the optimum technological combination has been obtained for producing coarse pure ramie noil yarns on rotor spinning system currently. Because of no yarn properties standard available at present for suchlike yarns, it is considered necessary to analyse the acceptability of coarse pure ramie noil rotor-spun yarns in terms of yarn properties before their products being developed. By the aid of a hypothetical concept "pure ramie noil ring-spun yarn", this paper draws the conclusion that the coarse pure ramie noil rotor-spun yarns are condsidered acceptable to a great extent; furthermore, it introduces 5 kinds of woven fabrics and 3 kinds of knitted fabrics successfully designed and developed from those yarns.

BALANCING TORQUE OF SINGLES COTTON ROTOR YARNS

This paper reports a recent development of a yarn modification process to produce torque balanced singles spun yarns. Taking advantages of the core-sheath structure of unconventional spun yarns, we have developed a yarn modification process and applied it to singles yarns spun by rotor spinning. Torque free singles yarns have been produced from 100% cotton fibers. The spirality of resultant single jersey knit fabrics has been greatly reduced or, in some cases, completely eliminated. Properties and performance characteristics of both parent and modified yarns as well as their resultant fabrics have been evaluated including the yarn tensile properties, surface properties, handle, air permeability, burst strength, and pilling resistance of the fabrics.

Analysis of Cotton Yarn Properties Spun on Aerodynamic Compact and Open-End Rotor Spinning

This article presents a comparative analysis of the properties of cotton yarn spun on aerodynamic compact spinning and open-end rotor spinning systems. Yarn samples with a linear density of 50 Tex, 37 Tex, 30 Tex, 25 Tex, and 20 Tex were spun both on the aerodynamic compact and rotor spinning systems using the same finisher drawn sliver of medium staple cotton which were produced by a specific mixing. The quality parameters such as mass variation, imperfection index, hairiness, and tensile behavior (strength in count strength product, elongation percentage) of the yarn samples were assessed and analyzed. The results revealed that aerodynamic compact spun yarn had a lower unevenness and mass variation, a higher imperfection in case of a finer count, less hairiness, higher tensile strength, and lower elongation% compared to the open-end rotor spun yarn samples. Finally, paired- samples t-test and regression analysis were carried out by using IBM SPSS 25 to check the significance of yarn quality parameters and correlation among them.

Prediction of Rotor Spun Yarn Strength Using Adaptive Neuro-fuzzy Inference System and Linear Multiple Regression Methods

This paper presents a comparison study of two models for predicting the strength of rotor spun cotton yarns from fiber properties.The adaptive neuro-fuzzy system inference(ANFIS) and Multiple Linear Regression models are used to predict the rotor spun yarn strength.Fiber properties and yarn count are used as inputs to train the two models and the count-strength-product(CSP) was the target.The predictive performances of the two models are estimated and compared.We found that the ANFIS has a better predictive power in comparison with linear multiple regression model.The impact of each fiber property is also illustrated.

Study of Rotor Spun Basofil/Cotton Blended Yarn Quality Characteristics during Optimisation of Processing Parameters

Yarn quality characteristics are affected by processing parameters. A 36 tex rotor spun yarn of 50/50 Basofil/cotton (B/C) blended yarn was spun, and the spinning process optimised for rotor speed, opening roller speed and twist factor. Selected yarn characteristics were studied during the optimization process. During the optimizations process yarn elongation and hairiness reduced with increase in rotor speed. Tenacity increased with increase of rotor speed. The increase in TF caused tenacity and CV of count to increase up to a peak and then started to decrease with further increase of TF. While TF caused an increase in yarn hairiness, elongation decreased to a minimum level and then started to increase with further increase of TF. CV of count and hairiness increased with increase in opening roller speed, but tenacity and elongation decreased with increase in opening roller speed. The optimization process yielded the optimum levels for rotor speed, opening roller speed and twist factor (TF) as 45,000 rpm, 6,500 rpm and 450 respectively. As per uster Standards the optimum yarn showed good results for CV of count, CV of tenacity and thin places/km.

Relationship between Abrasiveness and Structure of Rotor and Ring Yarns

The friction and abrasion characters of yarn play veryimportant roles in the downstream processing and theend-use of products.With the development of rotoryarn and its application in the knitted products,theproblem of abrasion on the machine components causedby the processed rotor yarn has been paid more andmore attentions.This paper deals with the factors effectthe abrasiveness of rotor yarn and the comparison ofabrasive character between rotor yarn and ring yarn.

TENSILE BEHAVIOUR OF ROTOR SPUN YARNS

This paper deals with the tensile behaviour of rotor spun yarns. Having regard to the spe-cial construction of rotor spun yarn, some modifications for Hearle’s theory have been made inorder to apply Hearle’ s theory to rotor spun yarn. The paper then goes into calculating thetensile curve and investigating the effect of main parameters and spinning conditions on thetensile behaviour of rotor spun yarn. It was found that the following facts are noteworthy forimproving the mechanical properties of rotor spun yarn: (1) Selecting suitable navel so as tocontrol the P. T. E. length within a reasonable range. (2) Improving the design of single fibresupply device to decrease the amount of spoiled fibre and hence increase the effective fibrelength. (3) Increasing spinning yarn tension without yarn break to enhance the fibre migrationratio. (4) For the rotor spun yarn of industrial use, it is the way to increase the yarn strengththat the rotor groove should be designed with the groove angle beneficial to decrease the yarnspecific volume.

A Study of the Behaviour of Denim Cloth Made from Modified Rotor Spun Yarn

This paper described the physical behaviour of three types of denim cloths produced from rotor yarn, ring yarn and modified rotor yarn (prepared by adding conventional twist to rotor yarn) respectively. Experimental work showed that denim cloth produced from the modified rotor yarn has superior properties over conventional rotor yarn in terms of surface texture and appearance,tearing strength and resistance to abrasion.

Abrasion Resistance Comparison between Rotor and Ring Spun Yarn

On the base of literature review and the analysis of yarn properties, yarn structure and some other facts, the abrasion resistance of both rotor spun yarn and ring spun yarns are discussed. The results show that with the same raw material and twist, the rotor spun yarn has lower abrasion resistance than that of ring spun yarn, because of the higher twist employed, the abrasion resistance of rotor spun yarn is higher than that of ring spun yarn.

The Behavior of the Rotor Spun Yarn(OE yarn)with Involving Twist

The rotor spun yarn(OE yarn),twist of which is calledlayering twist,was added a few involving twist,and itsstructure and properties were measured.The experimen-tal results have shown that the morphological structure ofthe rotor spun yarn with modified twist was changed andits tensile properties and abrasion resistance were im-proved.

The Yarn Curve and Tension in Rotor Spinning

The effective way of finding the yarn curve shape and tension of OE(open end) yarn inside the rotor is carried out and treated by dividing the yarn curve into two parts, from which the trajectory of the yarn sliding on the navel surface is also obtained. It is pointed out that the yarn curve shape and tension will both fluctuate with the trajectory's revolving cycle inside the rotor. However, the fluctuation is not too great, so the motion can still be regarded as approximately steady for dynamic analysis.

Yarn Tension at Peeling Point in Rotor Spinning

Based on the work and energy principle as explained inprevious literatures,the yarn tension at peeling point inrotor spinning was analyzed and calculated numericallyin this paper.The results show how raw materials,rotorspeed,rotor diameter,yarn linear density and navel de-sign can have certain definite effects on the tension valueat the peeling point.

Study on the Rotor Spinning Processing of Spun Silk/Cashmere Blended Yarn

This paper studies rotor spinning blended yarn produced of spun silk and cashmere.Nine samples were spun,from three different opening rollers and different navels.According to the Uster test results of yarn quality properties,optimum selection is done by using analysis method of combining fuzzy decision-making and fuzzy pattern classification.Experimental plan is designed based on universal rotated experimental design,and the method of confined optimization is used to optimize the speed of opening roller,the speed of rotor and twist factor,according to the results of yarn quality test by Uster.

THE PRACTICE OF ROTOR SPINNING IN PRODUCING SILK NOIL YARN AND THE DEVELOPMENT IN WOVEN FABRICS AND KNITTED GOODS

At present, we have succeeded in producing silk noil yarn by rotor spinning, and obtained good economic benefits. In this paper, through combining with the recent producing practice, systematically discussing and analysing the technology in the process of producing silk noil yarn by rotor spinning, we develop the new technology which is suited to produce silk noil yarn by rotor spinning, and address several noticable problems. The conclusions have been put into practice and proved to be effective and reliable. It can be consulted by the textile mills.

双分梳转杯纺花色牛仔纱设计及产品开发

为了解决传统牛仔纱颜色单调、织物风格单一,且存在染色污染的问题,从牛仔纱线花色设计出发,详述选用黑白粘胶纤维、通过改变不同颜色纤维组分比例,在双分梳转杯纺单头试验机上纺制5种双节花色变化牛仔纱的方案设计;选取颜色风格为灰黑的牛仔纱,以分梳辊转速、转杯转速及成纱捻度3因素设计正交试验,对比不同试验水平所纺的纱线性能,优选出最佳纺纱工艺组合及其织物织造工艺。指出:在分梳辊转速为7.5 kr/min、转杯转速为50 kr/min、纱线捻度为65捻/(10 cm)的条件下,纺制的牛仔纱质量较好,织物具有明显的灰黑牛仔风格;采用双分梳转杯纺技术、改变原料组分及交替比例的纺纱模式,能直接进行牛仔纱色彩设计,生产方便高效且过程环保;增加有色原料组分变化比例及变化次数,可纺制出多节渐变的花色牛仔纱。

同步辐射3Dμ-CT用于棉纱成像研究

纱线内部纤维的分布以及转移规律是纱线研究的热点。同步辐射三维显微CT成像技术(μ-XCT)具有穿透性强、分辨率高等优势,可以清晰地展示被检测物体的内部结构状况。本文基于同步辐射三维显微CT成像技术对一种棉纱(转杯纺棉纱)进行扫描,然后采用Avizo中AI辅助分割模块进行三维构建和可视化表征。结果表明:借助同步辐射CT成像技术实现亚微米分辨率棉纱的三维显微成像表征,可以获取纱的结构特征以及纤维在纱中纤维转移特征。这促进了人们对纱线结构和性能的全面深入理解,为优化棉纱生产、提高棉纱质量和性能提供了宝贵的信息。

面向全色域转杯纺纱的Kubelka-Munk双常数理论模型构建及颜色预测

为了能在色纺纱的纺纱阶段即时调控纱线颜色,减少混色成本,缩短工艺流程,结合三通道数控转杯纺纱的特点构建了全色域网格化混色模型,该模型可在纺纱过程中进行全色域范围内的色相调控、明度调控和彩度调控。为了解决色纺纱的测配色问题,得到与之相匹配的测配色系统,根据来样快速进行计算机测配色,节约成本,结合传统Kubelka-Munk双常数理论模型的特点,从构建的全色域网格化混色模型中选取混合样来进行颜色预测。从传统Kubelka-Munk双常数理论模型颜色预测的结果发现,部分混合样的预测反射率明显低于实际的反射率,针对这个问题,重新构建了新的Kubelka-Munk双常数理论模型来进行颜色预测得到新的预测反射率,并用插值替换的方法,把传统Kubelka-Munk双常数理论模型预测结果中明显低于实际反射率的部分用新的预测反射率替换,得到最终的混合样预测反射率。结果表明:与传统的Kubelka-Munk双常数理论模型预测混合样颜色结果相比,新的Kubelka-Munk双常数理论模型预测颜色并用插值替换法替换后得到的最终的混合样的颜色,色差平均值从1.48降低到1.04,且所有混合样的色差均能控制在2.0以内。该预测方法较传统Kubelka-Munk双常数理论模型具有更好的预测精度,所构建的全色域网格化混色模型和新的Kubelka-Munk双常数理论模型可应用于多基色纤维混色色彩和混合比的预测。

转杯纺技术发展回顾与趋势展望

探讨转杯纺技术的发展历史、现状及趋势。回顾转杯纺国内外的发展历程,厘清转杯纺技术的发展脉络,综述近年来转杯纺技术的发展现状,归纳成纱机理与纺纱器进步、适纺原料和适纺号数拓展、自动化和智能化应用方面的进展以及转杯纺发展历史上的有关争论,对转杯纺在新型纺纱器与新型结构纱线、转杯纺机理和关键器材的发展、纱线产品多元化、全自动与半自动技术融合以及基础研究等方面的发展趋势进行了展望。认为:转杯纺依据自身的特点能够在未来纺纱领域中占有一席之地,和环锭纺、喷气涡流纺进行错位竞争,针对纤维长度整齐度和细度均匀度差异较大的原料纺制大于14.5 tex的纱有较大优势;转杯纺进一步提高转杯速度和降低纺纱线密度的幅度不大,未来有望通过改进纺纱器设计、研发关键元器件来开发多元化纱线产品;纤维-气流两相耦合和成纱机理等研究是转杯纺技术发展的基础。

基于Friele模型的转杯纺黏胶混色针织物测配色系统

以红、黄、蓝3色原液着色黏胶短纤维为原料,采用多通道转杯纺技术,以质量比为10%的梯度纺制66种混色纱线,制备针织物样品,利用分光光度计测试其颜色特征。对Friele模型的关键参数σ在[0,1]内进行赋值以预测样品色彩,计算得出σ=0.134时双组分混色样品平均色差最小;取该值构建基于Friele模型的多通道转杯纺黏胶织物配色系统,利用全光谱配色法和所建模型预测3组分混色样品的配方比例,所得预测比例与实际比例间的平均比例误差为10.21%,平均色差为0.4561。研究结果验证了所建Friele模型的准确性,并为完善多通道转杯纺黏胶混色纺织品智能配色系统提供了依据。