紬丝包芯纺纱的探索

本文介绍了一般的包芯纱,包绕纱中纤维的组合形式、纺纱方法及成纱特点。在此基础上介绍了(纟由)丝包芯纺纱的工艺、试验所用的材料、成纱品质及其与(纟由)丝的比较。从而指出(纟由)丝包芯纱兼备了(纟由)丝和化纤长丝的特点。因此,(纟由)丝包芯纺纱有继续探索的必要和可能。     

Radial Yarn Movement in Yarn Duct of Interlacer

In order to find the relations between the production performonce of interlacer and its cross-sectional Shapcs of yarn duct,radial yarnsd movement in varions yarn ducts of interlacer and its effect on performance of interlaced yarn were studied in this paper. Seven interlacers,which were diffcrent in the cross- sectional shape of yarn duct,were made. Yarn motion in yarn duct of interlace was observed with optical fibers and photo- sensors. Performance of the interlaced yarn was evaluated by the number and the strength of tangles. Experfmental results disclose the relations between the yarn motions and the properties of the interlaced yarn. The interlacer with round yarn duct is capable of producing an interlaced yarn with bigger number of tangles,since It can make yarn transverse frequently the axis of air jet issuing from air jet nozzle. The interlacer with cornered shape of yarn duct makes yarn subjected to the action of compressed air for a longer time,which results in larger strength of tangles.     

不同测试条件对羊毛／莱卡包芯纱拉伸性能的影响

通过正交试验，分析拉伸速度、夹持长度、纱线线密度TF等因素对羊毛／莱卡包芯纱拉伸性能的影响．实验结果表明，影响纱线拉伸断裂强度程度大小依次为纱线线密度、拉伸速度、夹持长度；同种线密度的羊毛／莱卡包芯纱，在相同拉伸速度的条件下，随着夹持长度的增大，羊毛／莱卡包芯纱的断裂强力减小；在相同拉伸速度的条件下，包芯纱的断裂伸长率随着夹持长度增大而减小．     

Effect of Processing Conditions on the Interlaced Yarn

A new interlacer is used in this paper to investigate the effect of processing conditions on the properties of interlaced yarn. The experimental results show that number of tangles of interlaced yarn changes little with air pressure from 0.2 MPa to 0.5 MPa, and the number of tangles has a maximum value with yarn speed changing. For two yarn directions of entering and leaving yarn guide of interalcer, the yarn speed for the maximum number of tangles is 400 m/rain and 600 m/rain, respectively. The number of tangles changes with air pressure and yarn speed for two yarn directions is compared.     

一种新型纱线毛羽图像特征识别算法的研究

针对毛羽检测的问题,搭建了一套纱线毛羽的数字化图像采集系统,提出了一种新型的基于图像处理算法的纱线毛羽检测方法,可对连续采集的纱线图像序列进行特征分析,提取出可用于纱线毛羽质量评估的特征指标。通过对纱线图像进行预处理,包括灰度变换、背景处理、图像增强、动态阈值分割、倾斜纠正、图像去噪、图像分割,得到纱线的毛羽图像,并对毛羽图像进行细化处理,从而得到细化后的毛羽图像,以纱线轴线和主干边缘作为参考,选择合适的基准线,对毛羽像素点进行识别判断,统计得到不同长度毛羽的根数。实验表明,图像法测试的结果与目测法的结果最大偏差在5%以内,具有很好的一致性,该方法能够提高纱线毛羽检测的效率和精度。     

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.     

Analysis on the Characterization of the Twist Insertion Level and Its Effect of the Compact and Ring Spun Yarns

In this paper,the difference of the twist insertion levels of the compact and ring span yarns of the same count is analyzed based on the relationship of the yarn twist factor to the twist angle and the bulk density.It is proposed that the relationship of the twist angle,twist level,and the yarn diameter should be synthetically considered when evaluating the twist insertion level of the compact yarn.The twist angle of the compact yarn is smaller than that of the ring yarn with the same twist insertion level.This results from the ordered fiber arrangement and compact structure of the compact yarn.Experiment was conducted to verify the conclusions.It is also discovered that the selection of the twist factor of the compact yarn,which can be usually lower than that of the ring yarn by 10％-15％,can be determined based on the yarn tensile strength.     

赛络纺复合纱线结构及其拉伸力学模型

在对赛络纺复合纱线工艺、组分特点以及结构分析的基础上,从复合纱线组分纤维的拉伸性能着手,结合有关短纤维纱和股线的结构力学经典理论,计算并建立了非对称复合纱线的理论拉伸方程,并用几种组分纤维及其复合纱线性能参数的实验结果与理论拉伸方程进行了验证,两者的结果相符,利用此模型很容易计算并预测在既定成纱参数下的赛络纱线力学性能,并进一步揭示了赛络纺复合纱线的结构机理和拉伸性能之间的内在联系.     

Online Test and Fault Diagnosis of Yarn Quality Using Wavelet Analysis and FFT

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气流纱的拉伸特性研究

本文讨论气流纱的拉伸特性。Hearle曾对具有理想结构纱线的拉伸特性进行过比较完整的研究工作。本文则根据气流纱独特的成纱结构,对Hearle理论在气流纱中的应用作了一定的修正,并在此基础上对气流纱的拉伸特性作了分析计算。计算结果与实测结果基本相符。最后还从气流纱的应力-应变关系式中,就影响气流纱强力、初始模量以及断裂功等等力学特性的一些主要工艺参数进行了分析讨论。得出合理选用阻捻盘、很好控制捻度传递长度;合理设计与选用分梳及输棉机构,在不断改善单纤维供应的同时,尽量减少纤维损伤,提高纤维有效长度;适当提高纺纱张力,增加纤维转移等等都是改善气流纱强力等力学特性、提高成纱质量的有效途径。对工业用气流纱,还可通过合理设计凝棉槽,以提高气流纱紧密度的途径来提高气流纱强力。     

REPORT ON A PROJECT AIMED AT INCREASING THE STRENGTH OF FRICTION SPUN YARN BY USING A FALSE TWIST PROCESS

The lower strength of friction spun yarns has became a key problem that hinder the develop-ment of friction spinning,especially in high speeds and fine yarns.In this paper a project aimed atincreasing the strength of friction spun yarns by using a false twist process has been made.In re-ported experiment false twist was inserted into the yarn which has been formed on a friction spin-ning machine,so that it made the yarn untwist at first,then regain the twist.In the meantime draftwas applied to generate more tension than that which had been experienced during yarn formationon the friction spinning machine.It made the yarn reforming and the loosely bound fibres in thefriction spun yarn formed due to extremely low tension on the friction spinning machine becametighter.Results indicate that with the proper draft,tension and false twist the tenacity of processedyarn will increase more than 10%.This project is an attempt to discover whether improvements can be made and whether it isworth pursuing research into modifications of yarn structure.The results imply that if the yarntension can be raised during yarn formation on the friction spinning machine or a chance is offeredto the yarn to reform after the yarn formation the yarn tenacity will be increased obviously.     

新型纱线定长(测长)器的研制

络筒机在络纱时容易造成纱线长度长短不一，这将导致后续整经工序中纱线的巨大浪费。笔者研制出一种新型纱线测长器，在纱线卷绕的过程中对其进行精确测量，达到减小误差、节约成本的目的。     

管道纺成纱结构的研究

本文对管道纺纱的加捻过程作了分析,得出成纱的外层纤维捻度较大和内层纤维捻度较小的结论。然后,通过受力分析,从理论上加以证实,并采用电子显微镜等实验手段,对管道纺和摩擦纺两种成纱实物的外部结构和内部结构作了同样的观察和计算,从实验方面也证实了管道纺成纱结构是内松外紧,与摩擦纺成纱结构内紧外松正好相反,有利于提高成纱强力。     

Analysis on the Effect of Indirect Yarn Steaming for FM 50/50 yarn

This experiment devised and optimized the process of indirect yarn steaming.Properties of FM 50/50 yarn treated by indirect yarn steaming were measured.By using different yarn steaming parameters and gray system theory,we got the best parameter setting on the yarn steaming apparatus.By studying and comparing the problems in knitting process,effects of yarn steaming were further studied on yarn and blended knitted fabrics.     

基于AHP的纱线综合性能评价指标权重研究

运用层次分析法(AHP)确定了JC7.3tex纯棉赛络间接纬纱成纱质量评价指标的权重。在专家调查问卷基础上,通过构建层次分析模型和判断矩阵,对各评价指标的权重进行计算,并通过一致性检验确保权重的信度和效度。通过计算,结果显示在评价喷气织机用JC7.3tex纯棉赛络间接纬纱成纱综合性能时,其性能指标条干CV值、-50%细节、+50%粗节、+200%棉结、条干CVb、单纱断裂强度、单强CV值、毛羽指数、毛羽CV值的权重分别为0.076,0.067,0.064,0.056,0.070,0.179,0.165,0.179和0.144。     

防止纱线重叠的卷绕比确定方法

纱线卷绕中,不当的卷绕参数会导致纱线间距过小以致重叠,造成容纱量低、卷绕振动、退绕断头及混纱等问题。采用几何及数学方法,分析了纱线排布规律及其与卷绕比的关系,发现适宜的卷绕比可以实现纱线规律性的错开排布,进而有效防止纱线间距过小而产生重叠。提出了适应不同工艺要求的卷绕比确定方法,分析了卷绕过程中纱线夹角及最小纱线间距的细微变化及其对卷绕比选取的影响,给出了优化卷绕比防止纱线重叠的完整方法并进行了示例说明。     

四步法编织载纱装置设计思想

载纱装置的设计是实现四步法编织工艺的重要工作之一。根据四步法编织工艺理论对载纱装置的要求,通过对几种已有载纱装置的分析,提出了自己的设计思想： 采用发条弹簧驱动中间储纱筒作为载纱装置的核心部分,这一部分不仅实现纱线的回收,而且保证纱线张力在所要求的范围内。     

基于花式纱线结构的抗静电羊绒织物的开发

以涤纶基导电长丝为芯纱、锦纶低弹丝为固结纱、羊绒粗纱经牵伸后为饰纱,开发了4种抗静电羊绒花式纱线（花式平线、波形线各2种）,并分别制成纬平织物.对织物的抗静电性能进行测试,对比试验结果表明,抗静电羊绒花式纱线织物的电荷面密度仅为同线密度纯羊绒织物的1/8.同时分析了花式纱线的结构和包缠捻度的大小对织物抗静电性能的影响,研究发现：花式平线的导电效果优于波形线;随着捻度增加,由抗静电羊绒花式纱线制成的织物电荷面密度有减小的迹象.     

地毯簇绒装备的类齿轮特殊罗拉纱线牵引装置

与常规的挤压式、非挤压式罗拉纱线牵引装置作对比,介绍一种在地毯簇绒装备中使用的类齿轮特殊罗拉纱线牵引装置.进行这种特殊罗拉纱线牵引装置中的纱线力学理论研究,得出与实际情况吻合的罗拉纱线牵引性质：纱线所受张力与在罗拉啮合中所处位置的关系;两罗拉中心距变化与纱线所受张力的关系;罗拉齿外圆弧半径与纱线所受张力的关系;以及纱线所受摩擦力的性质.     

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.