喷气涡流纺纱线成形机理与结构

喷气涡流纺（MVS）是一种借助压缩空气形成高速旋转涡流场,对自由端纤维凝聚、加捻、成纱的纺纱技术。文章总结了喷气涡流纺纱线的结构成形机理,介绍了纱线结构分析方法,探讨了喷气涡流纺工艺参数与纱线结构的相关关系,为今后喷气涡流纺工艺设计与元件设计提出了相应的研究方向.     

Tencel有机棉喷气涡流沙的试纺

探讨喷气涡流纺纱的关键工艺及技术措施.通过分析喷气涡流纺纱技术原理、成纱特性以及Tencel有机棉喷气涡流纺纱生产过程中的工艺配置及采取的技术措施,并与环锭纺纱及紧密纺纱进行质量对比.结果表明:利用喷气涡流纺纱技术开发的Teneel有机棉喷气涡流纱,具有毛羽少,服用性能好等特点;喷气涡流纺技术工艺流程短,自动化程度高,用工少,成纱质量稳定.     

喷气涡流纺纱与转杯纺纱的对比分析

通过对喷气涡流纺和转杯纺的纺纱原理、纱的结构作对比分析,用相同原料和前纺工艺流程及相同的工艺参数在两种纺纱设备上进行生产,对生产效率、产品质量、生产成本作对比分析.指出了喷气涡流纺纱的优越性与有待解决的问题.     

喷气涡流纺纺制Modal纱的参数优化

用喷气涡流纺纱开发纺制Modal纱,通过单因子及正交试验,对喷孔角度、导纱针至空心管距离、空心管锥角3个喷嘴参数进行优化,得出较优参数为:喷孔角度80°,导纱针至空心管距离1.5 mm,空心管锥角15°.测试分析了成纱的特点,为Modal喷气涡流纱的纺制及应用提供了参考.     

喷气纺纱喷嘴对纱线强力影响的研究和探讨

喷气纺纱是继转杯纺纱(气流纺纱)、自捻纺纱、涡流纺纱之后发展起来的一种新型纺纱方法。它利用高速旋转气流来推动须条形成高速旋转的气圈运动，经固定喷嘴加捻成纱的。但是，喷气纱强力较低一直是喷气纺纱进一步发展的瓶颈。本文探讨了喷气纺纱喷嘴的主要结构参数对喷气纱强力的影响，并通过大量试验和科学计算优化出较理想的喷嘴结构参数，使纺出的涤棉混纺纱达到同类环锭纱强力的90％以上。     

粘胶棉混纺涡流纱的生产

为了拓展涡流纺纱的品种范围,提高成纱质量,对不同混纺比的粘胶棉涡流纱进行了试纺,纺制纱号有18.2 tex 14.6 tex.介绍了涡流纺纱的特点,纺纱各工序采取的工艺技术措施,并进行了涡流纺工艺优化试验.结果表明:通过采用条混工艺,开清、梳棉工序根据粘胶纤维和棉纤维的不同特性合理配置工艺,涡流纺工序优选喷嘴压力等工艺参数,纺纱生产顺利,粘胶棉混纺涡流纱质量较好.     

喷气纺纱喷嘴对纱线强力影响的研究和探讨

喷气纺纱是继转杯纺纱(气流纺纱)、自捻纺纱、涡流纺纱之后发展起来的一种新型纺纱方法。它利用高速旋转气流来推动须条形成高速旋转的气圈运动，经固定喷嘴加捻成纱的。但是，喷气纱强力较低一直是喷气纺纱进一步发展的瓶颈。本文探讨了喷气纺纱喷嘴的主要结构参数对喷气纱强力的影响,并通过大量试验和科学计算优化出较理想的喷嘴结构参数，使纺出的涤棉混纺纱达到同类环锭纱强力的90％以上。     

中空涤纶莫代尔亚麻混纺喷气涡流纱的纺制

探讨中空涤纶/莫代尔/亚麻35/35/30 15.5tex喷气涡流纱的纺纱工艺以及关键技术措施。通过对原料进行预处理、对亚麻纤维进行预梳理;合理配置前纺各工序的工艺参数;优选喷气涡流纺的喂入比、纺纱速度等工艺参数;加强车间温湿度的控制和设备管理,成功纺制出中空涤纶/莫代尔/亚麻35/35/30 15.5tex喷气涡流纱。认为:采用喷气涡流纺纱技术,对各个关键工艺参数进行优化,可以纺制出质量稳定且良好的亚麻混纺纱。     

腈纶喷气纺纱工艺参数优选

本文讨论日本村田(Murata)喷气纺纱机有关工艺参数(第二喷嘴压力、集棉器宽度和喂入比)变化对纺制纯腈纶纱的影响。许多技术人员已经通过测定喷气纺纱机各种条件下的纺纱技术性能,描述纺纱工艺参数及纤维参数对成纱结构和性能的影响,其目标主要集中于涤纶、粘胶、纯棉及其混纺品种,但对于纯腈纶喷气纱工艺研究的报道甚少。1　原料和方法本研究采用细度为1.5D、长度为51mm的腈纶纤维纺制24.6tex的环锭纱和喷气纱。环锭纱的捻系数为220,喷气纱的生产工艺设计参数见表1。表1　　不同参数的试样编号和纺出号数试样号第二喷嘴压力/MPa集棉器宽…     

喷气涡流纺纱特征的研究

研究喷气涡流纺纱成纱机理.对喷气涡流纺纱成纱机理的自由端纺纱特征进行了分析,利用PHOENICS软件对喷嘴中气流的运动进行了模拟,并利用高速摄影对纤维加捻过程进行了拍摄,结合成纱结构进一步说明了成纱机理.认为:喷气涡流纺纱具有明显的自由端纺纱特征,但中心仍有未断裂的一定量的连续纤维.喷气涡流纺纱可以看成是部分自由端纺纱、半自由端纺纱或亚自由端纺纱.     

复合纱产品开发与工艺研究

阐述了复合纱的纺纱工艺原理,通过对棉纺设备进行改造,结合生产实践,确定了复合纱的纺纱工艺流程,就纺复合纱的主要工艺参数进行了实验,分析了纺纱各工序影响复合纱质量的因素,通过合理配置纺纱工艺,解决了在纺纱过程中断头和条干不匀等问题,探讨了在加工复合纱过程中的可行性技术措施及工艺参数,为提高复合纱的质量和进一步开发新产品提供参考依据。     

优选纺纱器材提高特细纱质量的体会

在细纱工序生产特细纱时,进行了各种纺纱器材的使用试验,其中包括高精度无机械波罗拉、抗绕低硬度铝衬不处理胶辊、新型下销、高耐磨导纱钩、高精密合金钢领等。通过试验表明合理选用纺纱器材可逐步改善成纱的条干值和毛羽值。     

Research on process parameters in a novel drafting system

To overcome the shortcomings existing in the roller drafting system of air jet spinning, a set of combing roller-drafting system has been introduced to substitute the roller drafting system in air jet spinning. Moreover, a funnel-shaped fibre conveyer, a disc fibre collector and a swirl twister have been designed to accomplish the spinning process, which was named disc swirl spinning. Experimental spinning proves that combing roller drafting device wears little. Its remarkable advantage lies in the high efficiency of drafting. The rotational speed of jet stream in nozzle can be well utilized, which promises a high productivity. The relationship between the drafting process parameters of disc swirl spinning and yarn properties, such as tenacity and peeling-off-resistance, has been investigated and the data suggest that yarn properties keep stable when combing roller speed is 6000–7000 rpm, feeding quantity is 1.695–2 g/min, sliver linear density is 2–2.58 g/m, feeding tension is 0.012 N and the unwinding tension of the core filaments is 0.06 N. Furthermore, the appearance of disc swirl spun yarn is compared with that of air jet spun yarn. The scanning electron microscope (SEM) photos show that yarn structure of disc swirl spun yarn is similar to that of air jet spun yarn. The core is bound by the outer fibres and it is nearly parallel and no twist. However, the outer fibres of disc swirl spun yarn cover yarn body totally, which is different with that of air jet spun yarn.     

Optimization of dynamic model of ring-spinning yarn balloon based on genetic-algorithm parameter identification

Abstract

The research to date on the dynamic balloon of ring spinning is insufficient to meet the developmental requirements of high-speed ring-spinning machines. Therefore, the present aim is to better understand the dynamic balloon ring and how the spinning tension changes in high-speed spinning. First, taking the Coriolis inertial force, the air resistance, and the yarn dynamics into account, a dynamic model of the spinning yarn balloon is established in this article. The boundary conditions of the balloon shape in the spinning process are derived, and a method for identifying the initial parameters of the balloon shape based on a genetic algorithm is proposed. This method is used to seek the uncertain parameters that meet the optimization objective, obtain the initial parameters that meet the process requirements, and then solve the dynamic model of the balloon shape numerically. Finally, the model is compared and modified with the theory of image processing, whereupon the model for high-speed spinning is obtained. This study provides a good theoretical basis for analyzing the balloon shape and tension in high-speed spinning, and it provides reliable theoretical support for controlling the yarn tension and reducing yarn breakage in the spinning process.     

Application of air‐jet nozzle in short staple Siro spinning system

With the objective of reducing the hairiness of Siro spun yarns, two types of air‐jet nozzle differing in the angle of sub‐holes and suitable for an air vortex ring spinning system were designed and fabricated. The performance of the JetSiro spinning system on short staple fiber materials and the effects of the different parameters on the hairiness of JetSiro spun yarns, such as nozzle pressure of compressed air, distance between front roller nip and inlet of nozzle, and nozzle structure, were investigated using the Taguchi method. The physical properties of JetSiro spun yarns with those of conventional Siro spun yarns were compared. The results show that the parameters, air pressure and distance between front roller nip and inlet of nozzle have the strongest and weakest effect on yarn hairiness. In addition, the optimum spinning conditions were determined. The application of the air‐jet nozzle exhibits significant reductions in yarn hairiness of 40%. The results revealed no significant effect of the air‐jet nozzle on the yarn tensile properties and evenness.     

提高喷气纺成纱强力的探讨

主要介绍了喷气纺纱的成纱结构和影响其强力的因素——纤维性能、半成品质量及工艺参数，旨在找出提高成纱强力的措施。     

细纱机后区加装压力棒对成纱质量的影响

对细纱机后区加装压力棒前后的成纱质量进行了对比分析,结果表明,在纺制18 tex纯棉纱时,细纱后区加装压力棒对成纱质量有一定的改善.通过对细纱后区牵伸工艺参数进行正交实验,探讨了各工艺参数对成纱质量的影响及其显著性.     

喷气涡流纺纺纱过程中的气流场数值模拟

为明确高速气流成纱过程中气流产生和发展变化的规律,解决当前研究中存在的不足,对喷气涡流纺初始引纱过程和正常稳定纺纱过程的气流进行三维数值模拟及理论分析,并采用纺纱实验和借助扫描电子显微镜技术验证数值模拟结果。结果表明:纺纱初始时气流扰动小,湍流少,气流流线规则有序发展,喷嘴内负压气流产生强大吸力利于顺利引纱,模拟推测纤维的集束性较好,包缠和抱合效果较差;正常纺纱过程中气流场不稳定,湍流现象明显,气流轨迹复杂,并出现涡流和回流现象,回流为纱提供额外张力,利于提高纱线强力,模拟推测纤维的包缠和抱合效果较好,这也与纺纱实验结果相吻合。     

利用正交试验优化赛络纺细纱工艺

为了进一步提高成纱条干均匀度,对赛络纺细纱工艺进行正交实验,得出最佳工艺参数。