棉纺环锭细纱机纺纱动力的研究

本文包含了下面三部分的内容: 1.对环锭细纱机纺纱动力的基本概念进行了讨论。纺纱动力是由七部分的动力消耗所组成,其中钢丝圈的摩擦功率占有最大的比重。 2.提出了瞬时纺纱功率的测试方法,并利用该法在高速、纺中支纱的情况下,对纺纱动力进行了测定,得到了一些重要的结论:①在钢领板升降动程中,大直径纺纱功率大于小直径纺纱功率;②在一落纱中,纺纱功率的大小具有一定的分布。最大功率发生在成形结束大直径时,而最小功率发生在大纱小直径时;③在实际纺纱中,纺纱功率是气圈高度的指数函数,其指数的变化范围为:2.1—2.6。此外,对锭速与纺纱功率的关系,钢丝圈重量与纺纱功率的关系也作了测定与讨论。 3.讨论了减少纺纱动力消耗的途径:①通过设计新型钢领钢丝圈来减小一落纱的平均张力;②通过改变导纱钩的升降型式来降低一落纱的平均气圈高度。     

摩擦—喷气复合纺纱主要工艺参数的优化

分析了影响摩擦—喷气复合纺纱的主要工艺参数。采用二次旋转组合设计方法,通过实验建立了主要工艺参数与成纱强力的数学模型。并采用惩罚函数法进行优化计算,求得最佳工艺条件,根据优化工艺条件,在摩擦—喷气复合纺纱试验机上实际纺制32tex纯棉纱,纱的实测强力与理论结果基本一致,达到同类环锭纱的80％以上。     

摩擦－喷气复合纺成纱结构的研究

从理论和实际上论述了摩擦－喷气复合纺纱的加捻过程，并利用电子显微镜和示踪纤维方法对摩擦－喷气复合纱和色芯摩擦纺分别进行了分析和测量，发现摩擦－喷气复合纱的芯纱比包芯摩擦纱的芯纱具有较多的包缠纤维和较高的包缠捻度，表明摩擦－喷气复合纺纱有利于提高成纱强力．     

摩擦纺成纱结构及其应用的探讨

本文剖析了摩擦纺纱成纱结构的形成及其特点，阐明了摩擦纺纱取得发展的原因及其具有的优势，指出摩擦纺纱是继转杯纺纱之后最具生命力和发展前途，能在中、细号领域中与环锭纺纱竞争的一种新型纺纱方法     

摩擦纺纱加捻元件表面径向跳动对纺纱的影响

本文研究了摩擦纺纱加捻元件表面径向跳动对纺纱的影响。理论分析和实验的结果表明,加捻元件表面径向跳动将导致加捻纱条附加惯性力增加及加捻区负压的变化,直接影响纺纱稳定性和成纱捻度的分布均匀性。因此为保证纺纱质量,在加工和装配过程中,应对加捻元件的表面径向跳动严格加以控制。     

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。     

关于摩擦纺纱尘笼和摩擦辊的速比试验

本文讨论了摩擦纺纱中纱条稳定回转的条件,对单尘笼摩擦纺中尘笼和摩擦辊的不同速比进行了试验。通过试验得出在尘笼各项参数一定的条件下,存在最佳速比。     

Richcel纤维转杯纱的工艺特征及纺纱性能分析

介绍Richcel纤维的基本技术性能,对Richcel纤维转杯纺纱工艺特征和纺纱性能进行了分析,并通过Richcel纤维与棉混纺,确立了Richcel纤维与棉纤维混纺转杯纱的工艺流程和主要工艺参数,使设计的Rich-cel纤维转杯纱达到了较理想的质量要求.为规模生产Richcel纤维转杯纱积累了经验.     

中细特摩擦纺纱机主要元件的设计及其纺纱工艺的研究

本文主要介绍中细特摩擦纺纱机分梳装置、输棉管道、尘笼等主要元件的设计与制造技术，同时也讨论了分梳辊转速、逆向引纱方法以及其它工艺过程     

阻捻盘设计及纺纱条件对阻捻盘假捻效果影响的分析

气流纺纱机中的阻捻盘对气流杯内纱臂上一段纱的捻度高低有很大影响。也可以说,气流纺纱器的纺纱性能在一定程度上与阻捻盘设计有关。一些研究工作者曾就阻捻盘设计对成纱质量的影响进行了若干实验研究,然而有关阻捻盘设计对杯内捻度影响的数值分析尚未见有正式文章发表。本文就是借助电子计算机对阻捻盘摩擦区内纱条所受的摩擦力矩以及纱线离开摩擦区时的最终张力进行了数值分析。文章的第二部分主要是计算了在不同阻捻盘设计条件下的纱线与阻捻盘摩擦表面间的包围角大小;第二部分着重计算与分析了不同阻捻盘设计和纺纱工艺条件对摩擦力矩与最终张力值的影响。最后,就本文所得到的若干理论上的结果在生产实际中的应用以及本文所涉及的这一领域里的进一步工作进行了若干必要的讨论。     

EFFECT OF OPENING OPERATING PARAMETERS ON YARN QUALITY IN FINE AND MEDIUM COUNT FRICTION SPINNING

In this paper, a quantitative analysis of the opening quality in friction spinning and its main ef-fecting factors is first made. Upon this basis the Box-Hunter's experimental design method is usedto establish the quadratic regressional equations in terms of primary opening technologicalparameters and yarn quality for medium and fine count friction spinning. The results of analysisand discussion show that the proper choice of opening roller speed and its reasonable match withthe yarn count is singificant for ensuring the spinning quality index as well as reducing unevenness,thin and thick places of the yarn.     

摩擦纺纱中一种纤维分梳和输送装置的试验和分析

本文分析了目前粗支纱摩擦纺机和细支纱摩擦纺机的特点。作者设计了一种纤维分梳和输送形式。试验表明,该形式适纺支数范围较宽(148—18.5tex),能以1—2根条子喂入,纺制纯棉纱和各种纤维的混纺纱;可纺制内外层的纤维组分不一样的夹花纱;在安装附加装置后也可纺制包芯纱和花色纱。该装置机构简单,占地面积小,可供设计中、粗支纱摩擦纺纱机时参考。     

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.     

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.     

转杯纺分梳辊分梳质量的探讨

通过对不同分梳辊型式及转速条件下，转杯纺成纱质量的对比实验，分析了转杯纺纱机的分梳辊型式及其转速对分梳质量的影响。指出：分梳辊的型式对成纱强力、条干均匀度影响显著，在相同速度条件下，针辊的分梳效能优于锯齿辊。     

摩擦纺纱自由端须条加捻和纺纱张力

本文建立了摩擦纺纱自由端须条加捻的力学模型,讨论了有关因素对加捻力矩的影响。根据推导的计算公式,对纺纱张力进行了数值计算,并对有关因素的影响进行了分析研究。结果表明,纺纱张力计算值与测试值基本符合;两者各自的变化趋势也是一致的。说明本文所建立的力学模型基本上反映了摩擦纺纱的实际情况。