环锭纺气圈环形成的双段气圈形态和张力分析

环锭细纱机安装气圈环后将形成上下两段气圈。本文采用修正波长后的正弦曲线近似解来代替椭圆积分精确解,两者所得结果非常接近;此外再考虑了空气阻力及气圈环对纱线滞后作用的影响,就此两段气圈形态和张力进行了分析计算,既能使计算得到简化,又能保持较高的计算精度。     

环锭纺纱卷绕张力的计算与测试

本文通过对环锭纺纱任意一卷绕层的研究,提出该任意卷绕层的卷绕张力计算公式.由此方便地得到整个卷绕时的卷绕张力。本文同时提出了一种测试卷绕张力的方法,两者的结果是相符的。据此得到了卷绕张力与钢丝圈转速、钢丝圈重量等因素的关系。     

VISUAL ESTIMATE OF WORSTED YARN SPINNING TENSION

A method of visual estimate of yarn spinning tension on worsted ring spinning frame is pro-posed. This method is based on pragmatized classical theory of spinning balloon, and is supportedby experimental data.     

转杯纺纱时杯内纱条的曲线形状和张力

本文导得纺纱杯内纱条曲线形状和张力的方程;利用这些方程可以比较可靠地求得纺纱杯内的纱条张力,解决杯内纱条张力不易测定的困难。根据这些方程作图,就可从这些图中简捷地求得杯内纱条的重要参数,用来计算纱条张力。另外,本文对正反向剥取形式也进行了分析探讨。     

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.     

环锭纺气圈纱线张力的计算方法

不考虑空气阻力时的气圈张力计算已是众所周知,本文则是综合考虑空气阻力等的影响,对气圈张力进行较为全面的分析;并采用摄影与曲线图相结合的方法来求得实际纺纱时的气圈纱线张力值,为具体分析工艺问题与测算纺纱气圈张力提供理论上、方法上的依据。     

环锭细纱毛羽形成因素研究

本文通过理论分析与实验结果均证明纺纱张力大小对细纱毛羽的影响,只产生于采用传统类型钢丝圈的条件下,如果采用改进型钢丝圈,则尽管纺纱张力降低,细纱毛羽仍可保持不变。     

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。     

环锭纺气圈稳定性理论与气圈环控制

本文是在前文～(1)基础上对环锭纺极限气圈与气圈稳定性理论作进一步的研究,给出了气圈方程的椭圆积分解,用一系列曲线图来表示纱线张力与气圈形态之间的相互关系,并与正弦近似解进行了对比,结果表示在常用情况下两种解相当接近;最后又对气圈控制环进行了理论分析,也以一系列曲线图形式给出其合理的安装高度及其对降低T_0/ω～2)值所能带来的明显效果。     

双纱纺成纱区几何状态和单纱捻度的试验研究

在双纱纺纱中,交汇区中的单纱捻度和交汇角对成纱的性能有很大影响,我们将相隔一定距离的两股黑白复丝从前罗拉后方喂入加捻卷绕机构来模拟双纱纺纱过程,并利用高速照相对纺纱过程中的纱线进行动态摄影,分析了一些主要纺纱工艺参数对纺纱过程和纺捻线性能的影响。     

A METHOD FOR REDUCING YARN HAIRINESS AT RING SPINNING

In order to improve the quality of yarn,a research was carried out at ring spinning.A modifiedtraveller has been used to reduce the yarn hairiness vastly.According to the statistical analysis ofthe data,it was found that the geometrical shape of travellers is the key factor affecting the yarnhairiness at ring spinning.