低捻转杯纺纱实验与理论分析--提高低捻转杯纱强力探索

研究在转杯纺加捻区中加装阻扭件,然后选用相同的棉条纺制不同捻系数的转杯纱(加装阻扭件和不加装阻扭件)和环锭纱,并测试其成纱的强伸性能、表面形态和扭转性能.测试结果表明,加装阻扭件的转杯纱可以适当改善转杯纺的加捻效果,进而适当提高了转杯纱的成纱强力.     

低捻转杯纺纱张力与断头分析

讨论了转杯纺纱过程中捻度分布、张力分布以及断头率的测定分析.通过测定、分析与讨论,得出低捻转杯纺纱过程中,断头率急剧增加,接头成功率大大减少,同时断头的部位大部分发生在纺纱转杯至引纱管区域.因此增加转杯至引纱管区域的捻度,提高该纱段的成纱强力是低捻转杯纺纱的主要关键.     

转杯纺自由纱段形态对其捻度分布的影晌

通过对自由纱段的运动及受力分析,对自由纱段形态以及纺纱工艺参数对自由纱段捻度分布的影响进行了研究.研究表明因自由纱段在杯内成弯曲形状,从而使得自由纱段捻度自假捻盘入口处向剥离点处不断减少,直至剥离点处纱条捻度甚至降到只有设计捻度的40%～80%.为了保证凝聚槽内一定的捻度传递长度,则须适当提高设计捻度,这就揭示了转杯纱设计捻度高于环锭纱的一个主要原因.高速细支时的剥离点纱条捻度相对于低速粗支而言要高,说明只要一些纺纱工艺参数如转杯直径、转杯速度、假捻盘规格等配合得当,转杯纺也可高速稳定地纺制细支纱.     

转杯纺自由纱段形态对其捻度分布的影响

通过对自由纱段的运动及受力分析，对自由纱段形态以及纺纱工艺参数对自由纱段捻度分布的影响进行了研究。研究表明：因自由纱段在杯内成弯曲形状，从而使得自由纱段捻度自假捻盘入口处向剥离点处不断减少，真至剥离点处纱条捻度甚至降到只有设计捻度的40%-80%。为了保证凝聚槽内一定的捻度传递长度，则须适当提高设计捻度，这就揭示了转杯纱设计捻度高于环锭纱的一个主要原因。高速细支时的剥离点纱条捻度相对于低速粗支而言要高，说明只要一些纺纱工艺参数如转杯直径、转杯速度、假捻盘规格等配合得当，转杯纺也可高速稳定地纺制细支纱。     

转杯纺假捻盘作用现状研究

介绍了转杯纺假捻盘对纱线加捻过程影响作用的研究现状,分析和评价了几项比较具有代表性的研究,说明了假捻盘在转杯纺纱加捻过程中具有假捻、阻捻或捻陷作用的不同观点及其相应的分析方法,并对今后分析假捻盘在转杯纺加捻过程中作用的研究思路提出了建议。     

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。     

测试转杯纱捻度的退捻加捻法分析

通过对转杯纱结构和测试转杯纱捻度的几种退捻加捻法测试原理的分析,得出了一次退捻加捻法(GB 2543-81)、二重法和三倍退捻加捻法测试棉转杯纱捻度测试结果之间大小的一般规律.在上述三种退捻加捻法中,三倍退捻加捻法测试转杯纱捻度的测试结果最大,其次是二重法和一次退捻加捻法.     

棉纺翼锭加捻过程中几个问题的讨论

对棉纺翼锭加捻过程中的加捻点、加捻区、纱条真捻的获得及捻度的变化规律等问题进行了理论探讨和实验研究，证实该加捻过程唯一的真实加捡点为锭翼侧孔．锭翼顶孔不仅有捻陷与假捻作用，而且有阻捻作用．使用假捻器时，对纺纱段纱条的增捻效应是假捻及阻捻现象共同作用的结果．     

环锭细纱机动态捻度传递的研究

本文通过理论分析和实验测试,研究了环锭细纱机上加捻卷绕部分三段(纺纱段、气圈段和卷绕段)动态捻度传递及其相互关系.文中分析了导纱钩与纱线的接触情况、平均包围角度及其对捻度传递的影响;在气圈段分析了纱线在钢丝圈上包围角及阻捻系数的变化.文中还建立了相应的关系式.     

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。     

The Behavior of the Rotor Spun Yarn(OE yarn)with Involving Twist

The rotor spun yarn(OE yarn),twist of which is calledlayering twist,was added a few involving twist,and itsstructure and properties were measured.The experimen-tal results have shown that the morphological structure ofthe rotor spun yarn with modified twist was changed andits tensile properties and abrasion resistance were im-proved.     

Experimental Investigation of Yarn Twist Blockage

In twisting a yarn running over a guide surface, the twist inserted into the part in front of the guide is impeded to transmit freely to the part behind the contact zone. A new device has been set up for investigating twist blockage and yarn torque - twist simultaneously. Measurements of twist blockage in relationship to different parameters have been carried out by using a monofilament yarn and a multifilament yarn. The factors under consideration include the wrap angle, yarn tension and input twist.     

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

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绢丝/化纤长丝Sirofil复合纱扭转性能

在自制纱线扭矩-捻度装置（扭力秤法）上对绢丝／锦纶长丝、绢丝／涤纶长丝Sirofil复合纱的扭矩及其扭矩松弛行为进行测试分析，探讨其扭矩及其扭矩松弛率与复合纱纺纱捻度和纺纱间距间的关系，为这类仿丝型Sirofil复合纱的加工、应用提供实验依据和参考．     

Abrasion Resistance Comparison between Rotor and Ring Spun Yarn

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Effect of Static False Twist on Rotor Spinning

Many practices of the rotor spinning show that the false twist effect of the navel is much more complicated than that of the one point based friction model. Both ends of the yarn＇s twist and torque changes were analyzed under the static effect of the navel, and then established yarn twist ratio on both ends. It verified its correctness through simulation experiment by designing the experimental device, and analyzed the effect of navers radius on twist ratio.     

Study of the Twist Distribution inside Rotor

In this paper, the kinematics and dynamics of the yarn on the navel were studied. A series of twist distribution curves were obtained by numerical calculation. The results show that the navel is essential to the false twist development on the yarn arm. The fiber surface properties, yarn linear density, rotor speed and diameter, navel design are all the parameters having remarkable effects on the false twist level inside rotor.     

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.