Study on Licker-In and Flat Speeds of Carding Machine and Its Effects on Quality of Cotton Spinning Process

Spinning has a significant influence on all textile processes. Combinations of all the capital equipment display the process’ critical condition. By transforming unprocessed fibers into carded sliver and yarn, the carding machine serves a critical role in the textile industry. The carding machine’s licker-in and flat speeds are crucial operational factors that have a big influence on the finished goods’ quality. The purpose of this study is to examine the link between licker-in and flat speeds and how they affect the yarn and carded sliver quality. A thorough experimental examination on a carding machine was carried out to accomplish this. The carded sliver and yarn produced after experimenting with different licker-in and flat speed combinations were assessed for important quality factors including evenness, strength, and flaws. To account for changes in material qualities and machine settings, the study also took into consideration the impact of various fiber kinds and processing circumstances. The findings of the investigation showed a direct relationship between the quality of the carded sliver and yarn and the licker-in and flat speeds. Within a limited range, greater licker-in speeds were shown to increase carding efficiency and decrease fiber tangling. On the other hand, extremely high speeds led to more fiber breakage and neps. Higher flat speeds, on the other hand, helped to enhance fiber alignment, which increased the evenness and strength of the carded sliver and yarn. Additionally, it was discovered that the ideal blend of licker-in and flat rates varied based on the fiber type and processing circumstances. When being carded, various fibers displayed distinctive behaviors that necessitated adjusting the operating settings in order to provide the necessary quality results. The study also determined the crucial speed ratios between the licker-in and flat speeds that reduced fiber breakage and increased the caliber of the finished goods. The results of this study offer useful information for textile producers and process engineers to improve the quality of carded sliver and yarn while maximizing the performance of carding machines. Operators may choose machine settings and parameter adjustments wisely by knowing the impacts of licker-in and flat speeds, which will increase textile industry efficiency, productivity, and product quality.

Study on Licker-In and Flat Speeds of Carding Machine and Its Effects on Quality of Cotton Spinning Process

Spinning has a significant influence on all textile processes. Combinations of all the capital equipment display the process’ critical condition. By transforming unprocessed fibers into carded sliver and yarn, the carding machine serves a critical role in the textile industry. The carding machine’s licker-in and flat speeds are crucial operational factors that have a big influence on the finished goods’ quality. The purpose of this study is to examine the link between licker-in and flat speeds and how they affect the yarn and carded sliver quality. A thorough experimental examination on a carding machine was carried out to accomplish this. The carded sliver and yarn produced after experimenting with different licker-in and flat speed combinations were assessed for important quality factors including evenness, strength, and flaws. To account for changes in material qualities and machine settings, the study also took into consideration the impact of various fiber kinds and processing circumstances. The findings of the investigation showed a direct relationship between the quality of the carded sliver and yarn and the licker-in and flat speeds. Within a limited range, greater licker-in speeds were shown to increase carding efficiency and decrease fiber tangling. On the other hand, extremely high speeds led to more fiber breakage and neps. Higher flat speeds, on the other hand, helped to enhance fiber alignment, which increased the evenness and strength of the carded sliver and yarn. Additionally, it was discovered that the ideal blend of licker-in and flat rates varied based on the fiber type and processing circumstances. When being carded, various fibers displayed distinctive behaviors that necessitated adjusting the operating settings in order to provide the necessary quality results. The study also determined the crucial speed ratios between the licker-in and flat speeds that reduced fiber breakage and increased the caliber of the finished goods. The results of this study offer useful information for textile producers and process engineers to improve the quality of carded sliver and yarn while maximizing the performance of carding machines. Operators may choose machine settings and parameter adjustments wisely by knowing the impacts of licker-in and flat speeds, which will increase textile industry efficiency, productivity, and product quality.

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 ACRYLIC SIROSPUN YARN ON THE SEMI WORSTED SPINNING FRAME

The technique of sirospun process is applied on a modified semi-worsted balloonless spinningframe to investigate the effect of spindle-speed,yarn-twist and strand-spacing on yarn properties.Yarn breaking strength,breaking extension,evenness and imperfection are examined on the basisof CCD experimental design.Yarn hairiness is particularly concerned,being found that all spinningparameters tested have significant effects on hairiness and that the minimum number of hairs oc-curs at the strand-spacing of 14.4 mm.Compared to conventional single spun yarn,experimentshave revealed the greatest advantage of using sirospun process is that all sirospun yarns have muchless hairiness.A new sirospun yarn fault,so called“loop”,has also been examined.The most likely cause forthis yarn fault is the strand-tension unbalance between the two strands when low tension spinningis applied.Further analysis and some initial tests have been carried out in the hope of overcomingthis loop fault which is an important obstacle to the application of balloonless spinning.

Study on Spinning and Properties of PLA Yarn

The essay recommends the various properties of polylactic-acid yarns in order to know them in a new step.Designing the process and spunning of the PLA yarn,analyzing the points of the processes.The PLA yarn is processed with different methods.The properties such as the strength and elongation,the frictional resistance are analyzed.The relationship between the strength and the twist factor was determined.So the basic properties of the PLA yarn is determined.Through the comparison of various parameters,a thorough understanding of the basic properties of PLA yarn,thereby determining the best PLA yarn production and use conditions,and for the PLA yarn production and provide technical support.

Theoretical Modeling for Predicting the Optimum Twist Angle of Cotton Fiber Movement on OE Yarn Made by Rotor Spinning Machine

This paper presents theoretical modeling for predicting the optimum twist angle on yarn made by open end rotor spinning machine in textile industry. Fiber movement on yarn can be used for predicting the optimum twist angle which can be used to reduce yarn breaking in spinning process. In this research the twist angle has been found and the result of this research shows the twist angle around 45°;and the theoretical result of the ratio of rotor diameter to fiber length is .

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.

喷气涡流纺莱赛尔/涤纶包芯纱的开发

为丰富喷气涡流纺纱线产品种类,文章以莱赛尔为外包纤维、涤纶DTY网络丝为芯纱,探讨了喷气涡流纺包芯纱的生产及纺纱工艺设计的重点与难点,成功开发出18.5 tex喷气涡流纺莱赛尔/涤纶包芯纱。研究表明,针对莱赛尔短纤维的特性,梳棉工序应增强梳理并提高转移效率,并条工序应提升纤维伸直平行度;喷气涡流纺工序应科学选择喂入比,正确调整芯丝喂入张力等工艺参数,合理控制喷嘴压力,加强温湿度管理。相关生产实践为开发高附加值喷气涡流纺纱线产品提供了参考。

涤棉混纺段彩纱的工艺优化及风格探讨

为探讨涤棉粗纱混纺段彩纱的纺纱工艺与成纱风格,以涤棉混纺粗纱为原料,采用三罗拉牵伸法,通过HFX-A6型多功能细纱机来制备涤棉段彩纱。研究工艺参数(捻度、分段时间和牵伸倍数)对段彩纱风格(外观、结构、强伸性能、条干均匀度和毛羽)的影响,并根据其外观风格建立了段彩纱的周期结构模型。试验结果表明,增大辅纱分段时间和牵伸倍数对纱线风格具有积极的影响,而增大捻度对纱线风格具有消极的影响。当纺纱工艺的捻度为90捻/m,基纱与辅纱分段时间均为1 s,两根粗纱的总牵伸分别为22.8倍和24.0倍时,段彩纱的综合性能最为优异。

基于负离子纤维的喷毛带子纱产品开发

以涤纶负离子中长纤为原料,经过和毛、梳理、并条、粗纱工序后制成粗纱条,在花色喷毛机上喂入到由涤纶长丝编织的带子纱中,通过改变花色喷毛机的工艺参数制成三种不同细度的负离子喷毛带子纱,织成样片后进行负离子发生量的测试和评价。结果表明,三种规格的喷毛带子纱负离子发生量皆大于1 000个/cm^(3),负离子发生量较高,能达到维持人体基本健康需求、增强免疫力的效果。纺纱试验表明,当粗纱喂入罗拉的速度控制在20 r/min~25 r/min,纱线细度控制在3 NM~3.3 NM时,所纺纱线的负离子发生量维持在最高水平。产品利用喷毛带子纱蓬松的纱线结构,使负离子纤维能更好地释放出负离子,发挥保健功效。

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。

全羊毛及羊毛混纺精纺超级抗皱面料的生产方法

对比不同羊毛含量混纺弹力面料的纱线断裂强力变化,优化生产方法,并使其具有抗皱性能。结果表明优化工艺参数为:羊毛质量分数50%以上,莱卡4%,纬弹采用包并纺纱,牵伸倍数2.5倍,捻系数220~200(毛含量越高,捻系数越低),纬经比例0.9,总紧度118。采用以上工艺参数生产的面料抗皱性能最佳4级及以上,断裂强力最好,手感适中,所有性能可以兼顾。

基于ISSA-BP神经网络的纺纱生产工艺参数反演

针对传统的反演模型精度不高且传统BP神经网络有权值和阈值初值过于随机化、稳定性和准确性差等问题,提出了基于改进麻雀搜索算法(ISSA)的BP神经网络纺纱生产工艺参数反演模型。利用灰色关联分析法提取出10个关键工艺参数,以其作为模型输入;引入Chebyshev混沌映射、正余弦算法(SCA)和自适应权重因子对麻雀搜索算法(SSA)进行优化,并用ISSA优化BP神经网络,在此基础上构建纺纱生产工艺参数反演模型;利用ISSA对参数反演模型进行求解。以纤维属性和纺纱车间细纱工序为对象进行反演验证,试验结果表明:ISSA-BP预测值的MAPE、MSE、MAE、迭代次数、适应度值均优于SSA-BP模型;对反演优化后的工艺参数进行预测,预测的质量指标与期望质量指标的平均相对误差(MRE)为5.04%。认为:基于ISSA-BP神经网络的纺纱生产工艺参数反演精度较高,有助于工艺参数的合理设计。

复合仿棉用72 dtex/72 f全消光PET POY熔体直纺工艺优化

以特性黏数为(0.650±0.020)dL/g的聚对苯二甲酸乙二醇酯(PET)为原料,通过熔体直纺工艺生产复合仿棉用72 dtex/72 f全消光PET预取向丝(POY),研究了喷丝板及组件过滤材料、纺丝速度、冷却条件、集束位置、缓冷器温度、油嘴结构对纤维生产稳定性和性能的影响。结果表明:选择孔深为0.46 mm、孔径为0.16 mm、孔长径比为3.0的喷丝板,以金属砂作为组件过滤材料,将组件初始压力控制在17 MPa,生产稳定且组件使用周期达到45 d;控制纺丝速度2950 m/min、冷却风压力28 Pa、集束位置600 mm、缓冷器温度290℃,采用出油孔下方设计有搓衣板形态混油槽的油嘴,生产的72 dtex/72 f全消光PET POY的满卷率达到99%以上,断裂伸长率小于120%,能满足最终仿棉PET产品的加弹工艺要求。

立达G32型环锭细纱机控制系统改造

针对立达G32型环锭细纱机在运行中出现纱线强捻、电气元件老化、系统兼容性差等问题,介绍其CPU、操作面板、驱动器等控制系统以及电控箱电气元件升级换代的具体操作,并对比验证改造前后的技术要求和改造效果。指出:改造后的立达G32型环锭细纱机控制系统稳定可靠、兼容性较高,能保持原车布局结构且操作维修方便;改造成本低,整车性能良好,生产纱线的各项指标合格。

Determination of the Law of Motion of the Yarn in the Spin Intensifier

The article is devoted to the study of spreading of the twisted yarn in a spinning cell. The article presents the scheme and principle of operation of the effective design of the yarn-output tube of pneumomechanical spinning machine. To determine the law of motion of a roller installed in a yarn-output tube, the tension of the thread enveloping the surface of the rotating roller was studied, as a result of which the equation of its motion was obtained. As a result of solving the equation, the values of the thread tension on the surface of the rotating roller are obtained. The dependences of the change in the tension of the thread in time are obtained depending on the angle of rotation and the mass of the roller. The recommended design of the yarn-output tube allows increasing the strength characteristics of the pneumomechanical yarn.

STRUCTURAL VARIATIONS OF HOLLOW SPINDLE WRAP SPUN YARNS

The structure of a hollow spindle wrap spun yarn depends greatly on the steadiness of bindertension and of balloon rotation.The two commonly used binder bobbin forms,the cop type andthe flanged type,both as sources of spinning condition fluctuation,are examined in order to revealtheir effects on the wrap spun yarn structure.False twist is introduced on hollow spindle spinningmachines in order to avoid strand breaks before it is tightly wrapped up.However,an investigationof the false twisti g-wrapping process shows that this inevitably causes irregular yarn tortuosity.

捻度对锦纶/棉混纺纱质量指标的影响

为进一步提升锦纶/棉混纺纱质量,针对捻度与锦纶/棉混纺纱质量指标的关系问题进行了分析。在其它工艺相同的条件下调整细纱工序捻度的设置,纺制了16种锦纶/棉混纺纱,对其质量指标进行测试,并通过SPSS软件对捻度与混纺纱质量指标之间的关系进行拟合与回归分析,建立了混纺纱质量指标随捻度变化的回归预测模型。结果表明,捻度与锦纶/棉混纺纱强伸性能、粗细节和毛羽指标显著相关,测试组数据与预测值间残差绝对值均在3倍残差标准差以内,验证了模型的有效性。捻度大小直接影响锦纶/棉混纺纱的强伸性能、粗细节和毛羽指标,预测模型反映了捻度对混纺纱强伸性能、粗细节和毛羽指标影响的数量相关关系,为锦纶/棉混纺纱生产中捻度设计和快速调整提供了参考依据。

含锦氨长丝毛精纺面料的纱线纺制及后整理关键工艺改进

为解决含锦氨长丝的毛纱生产技术难度大、疵点多及其面料整理时易产生折痕和尺寸不稳定等问题,通过优选多组分纤维组合方式、改变长丝退绕工艺和改造纺纱设备等方法改进纺纱工艺,结合后整理采用坯布和干整理2次热定形工艺、平幅洗呢和高速空气撞击柔软工艺相结合等方法,制备一种含锦氨长丝毛精纺面料。对混纺纱线的乌斯特指标和面料的尺寸稳定性、弹性、强力、耐磨性等指标进行测试分析。结果表明:制得的含锦氨长丝的毛精纺面料弹性优良、耐磨性和尺寸稳定性好,易于护理,适合制作各季职业装等服装;含锦氨长丝的毛纱条干CV值、粗细节和毛羽指数达到乌斯特公报5%水平,强力、强度和伸长指标达乌斯特公报5%~50%水平。