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。     

黄麻细纱成纱结构的研究

本文对黄麻细纱的成纱结构进行了讨论,提出了衡量纤维在细纱中转移的指标,对细纱拈度、纤维的长度和细度等因素与成纱结构的关系进行了实验、计算和分析,并提出了改善黄麻细纱成纱结构的途径。     

集聚纺的纱线强力理论

为了从理论上分析集聚纺纱线较环锭纺纱线强力提高的原因,基于两种纱线的结构差异,如纤维的转移、纤维的堆积密度、纱线的直径等,建立了一个纱线结构计算模型.从理论上分析了纤维伸长率分布、纤维堆积密度及纱线直径对纱线强力的影响,合理解释了集聚纺纱线强力上升的原因.     

化纤气流纱截面内捻回分布的测试方法和结果——气流纱捻度问题研究之二

本文是气流纱捻度问题研究的第二部分,着重研究几种主要的化纤气流纱截面内捻回的大小和分布情况;探索和初步解决了采用示踪纤维描迹法观测涤纶和维纶纤维气流纱的溶液配置的试验方法。通过测试得出了化纤气流纱截面内捻回分布的规律和棉气流纱相一致的结果;还发现几种化纤气流纱与棉气流纱一样,其实际捻度小于计算捻度,其中差异最大的是涤纶气流纱,最小的是腈纶气流纱。     

气流纱结构的试验与分析

本文对几种不同机构及不同工艺参数的气流纺纱器所纺的纱,进行了成纱结构的试验与分析,并与环锭纱作了比较.试验结果表明,不同机构和不同工艺参数的纺纱器所纺的气流纱之间在结构上虽有差别,但是,它们在基本的结构属性上是相同的,表现出气流纱中纤维排列形态较差,结构蓬松.这就是气流纱强力一般都比环锭纱低的主要原因.同时本文根据各种纺纱器所纺气流纱与环锭纱之间的差异,结合一些理论分析,提出改进气流纱质量的一些初浅的看法,与大家共同商榷.     

转杯纺纤维输送管道的研究

本文选择FA601A型机纺纱器的输送管道为研究对象,设计五个新输送管道,通过纺纱对比试验,根据各方案成纱的“乌氏”质量指标及成纱结构质量指标,采用聚类分析方法,比较科学地得出6号管道的成纱质量最佳,反映在纺58.3 tex的成纱结构中,不规则纤维占54.0％,打卷纤维只占10％。其主要原因是6号管道符合以下设计原则:(1)提高输送管道进口段气流速度,使纤维脱离锯齿的过程中,增强头端弯钩的伸直度,同时有利于纤维的轴向流动;(2)减少输送管道出口气流方向与滑移面交点切线的夹角,可减少不规则纤维;(3)减少输送管道剥离区空间,可减弱该区涡流的产生,从而改善纤维形态。由此可见,输送管道结构对成纱质量有显著影响,而纤维形态是影响成纱质量的重要因素。     

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.     

高速压缩空气对纤维分离的研究与应用

对纤维在喷嘴中产生的喷气流场中的受力和运动情况作了理论分析和推导,探索了利用高速压缩气流来分离纤维的可能性,在此基础上提出了一种新的纺纱方法——喷气自由端纺纱,并设计了纺纱装置进行纺纱实验,结果表明,这种方法纺出的纱具有一般自由端成纱的结构,且本方法利用高速气流来形成自由端和加捻成纱,不损伤纤维.     

腈纶纤维分梳性能及转杯纱质量的研究

研究了３种特性不同的腈纶纤维的分梳性能及其成纱质量．实验表明,不同特性的腈纶纤维的分梳性能是不同的．随分梳辊速度的提高,纤维拉伸特性下降、长度减短;纺杯内的积尘量与纤维损伤的程度有着直接的关系;转杯纱的质量与纤维的分梳性能有着密切的联系．     

荨麻纤维可纺性能的分析研究

探讨天然野生植物纤维--荨麻纤维的可纺性.测试了荨麻纤维的物理机械性能,如长度、细度、强度和柔软度等指标,分析了荨麻纤维在纺织加工过程中的纺纱性能;采用不同的纺纱系统和纺纱工艺,对其可纺性作了进一步的研究.结果表明,由于荨麻纤维的主体长度较短,细度和长度离散较大,纯荨麻纤维无法成纱,与棉混纺时可以成纱;但成纱质量并不理想.为开发野生荨麻资源提供参考.     

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.     

转杯纺纯棉竹节纱的工艺探讨

通过在BD200SN转杯纺纱机上加装伺服驱动自控系统,控制纤维喂入量来改变牵伸倍数的方式实现纺制转杯纺纯棉竹节纱.通过工艺实验,分析了纤维性能、纺纱工艺等因素对转杯纺纯棉竹节纱质量的影响,探讨了生产转杯纺纯棉竹节纱的工艺措施,纺制了符合质量要求的转杯纯棉竹节纱.     

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

BａｃｋｇｒｏｕｎｄＩｎｔｈｅｅａｒｌｙ 195 0ｓ,ＭｏｒｔｏｎａｎｄＹｅｎ[1] ｄｅｖｅｌｏｐｅｄｔｈｅｆｉｂｅｒｔｒａｃｉｎｇｍｅｔｈｏｄｉｎｔｈｅｙａｒｎ .Ｔｈｅｙｍｉｘｅｄｓｏｍｅｄｙｅｄｆｉｂｅｒｓｉｎｔｏｙａｒｎｂｅｆｏｒｅｃａｒｄｉｎｇ ,ａｎｄｄｉｐｐｅｄｔｈｅｙａｒｎｉｎａｃｈｅｍｉｃａｌｒｅａｇｅｎｔｗｉｔｈｓｉｍｉｌａｒｒｅｆｒａｃｔｉｖｅｉｎｄｅｘｔｏｏｂｓｅｒｖｅｔｈｅｄｙｅｄｆｉｂｅｒｓｉｎｔｈｅｙａｒｎｕｎｄｅｒｔｈｅｍｉｃｒｏｓｃｏｐｅ .Ｔｈｅｃｏｎｃｅｐｔｏｆｆｉｂｅ…     

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.     

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.     

转杯速度与成纱质量关系的研究

本文探讨了国产转杯纺纱器的转杯速度与成纱质量的关系,采用经过优化的转杯、隔离盘和假捻盘进行纺纱。试验结果表明,随着转杯速度的提高,成纱质量基本上呈下降趋势。但在杯速为50000 r/min 左右时,成纱质量的几项主要指标最佳。这对于合理设计转杯速度具有一定的参考价值。     

Abrasion Resistance Comparison between Rotor and Ring Spun Yarn

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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 yam showed good results for CV of count, CV of tenacity and thin places/km.     

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 yam count are used as inputs to train the two models and the count-strength-product （CSP） was the targel. 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.