紧密纺牵伸系统对C14．6tex纱条干的影响

通过对紧密纺牵伸系统中后区曲线牵伸、胶辊、胶圈以及隔距块等影响成纱条干质量的关键因素所作的正交组合试验和分析，探讨了紧密纺牵伸系统对C14．6tex纱奈干的影响，表明后区曲线牵伸、低硬度高弹性胶辊、硬度适宜弹性好的胶圈和尺寸合适的隔距块能有效降低成纱条千CV值，减少粗、细节，提高成纱质量。     

紧密纺牵伸系统对C14.6 tex纱条干的影响

通过对紧密纺牵伸系统中后区曲线牵伸、胶辊、胶圈以及隔距块等影响成纱条干质量的关键因素所作的相关实验和分析,探讨了紧密纺牵伸系统对C14.6 tex纱条干的影响。     

紧密纺牵伸系统对C 14.6 tex纱条干的影响

通过对紧密纺牵伸系统中后区曲线牵伸、胶辊、胶圈以及隔距块等影响成纱条干质量的关键因素所作的正交组合试验和分析,探讨了紧密纺牵伸系统对C 14.6 tex纱条干的影响,表明后区曲线牵伸、低硬度高弹性胶辊、硬度适宜弹性好的胶圈和尺寸合适的隔距块能有效降低成纱条干CV值,减少粗、细节,提高成纱质量。     

提高CJ 11.7 tex纱条干均匀度的工艺配置

为了提高细纱条干均匀度,以生产CJ 11.7tex纱为基础全面分析了细纱工艺与成纱条干均匀度的关系,并对影响成纱条干均匀度的前区工艺参数、后区牵伸工艺进行了工艺配置试验。结果证明:采用较小的粗纱定量、细纱捻系数、较大的粗纱捻系数、较小的前中罗拉隔距、钳口隔距、后区牵伸倍数以及较大的前胶辊压力、前胶辊直径,适当增加粗纱捻系数等措施,可以改善成纱条干CV值。     

改善JC 11.7 tex纱条干均匀度的工艺优选

为改善JC 11.7 tex纱条干均匀度,采用单因素试验分析方法,对影响细纱条干均匀度的粗纱定量、粗细纱捻系数、细纱罗拉及钳口隔距、后区牵伸、胶辊直径和加压等诸多因素进行了试验分析和优选。结果表明:采用优选的工艺参数后,成纱条干CV下降为12.52%。认为:在充分考虑配棉及细纱设备的条件下,通过工艺试验优选工艺参数,可较好地改善成纱条干均匀度。     

紧密纺牵伸部分主要工艺对成纱质量的影响

在相同工艺条件下,分别采用压力棒隔距块和普通隔距块纺制紧密精梳14.6 tex纯棉纱,发现使用压力棒隔距块时单纱的毛羽、强力和条干均有改善.还使用不同的前胶辊加压和压力棒隔距块进行了纺纱实验,分析了各因素对纱线性能的影响,并对各因素进行了优选.     

并条牵伸对成纱条干均匀度的影响试验

在FA302型并条机上进行了并条牵伸、工艺配置对成纱条干均匀度的影响试验，认为并条工艺配置对成纱条干均匀度的影响显著。采用头并较大的后区牵伸倍数、二并较小的后区牵伸倍数，在加压适宜的条件下，采取较小的罗拉隔距，均可改善成纱条干，提高成纱质量。     

曲线牵伸上销对紧密纺成纱条干影响的探讨

细纱机后区牵伸形式影响成纱条干.对现有的细纱机后区牵伸形式进行分析,介绍了曲线牵伸上销对后区牵伸形式的影响,并对普通紧密纱和曲线牵伸上销纱线进行了测试,结果表明曲线牵伸上销对14.6tex和9.8 tex的紧密纺成纱条干改善明显,但7.3tex的紧密纺成纱条干恶化.     

提高CJ 11.7tex纱条干均匀度的工艺配置

在生产CJ11.7tex纱的基础上全面分析了细纱工艺与成纱条干均匀度的关系,并对影响成纱条干均匀度的关键工艺前区工艺参数、后区牵伸工艺进行了优化配置。实验结果证明:采用较小的粗纱定量、细纱捻系数、前中罗拉隔距、较小的钳口隔距、较小的后区牵伸倍数以及较大的前胶辊压力,采用较大前胶辊直径,适当增加粗纱捻系数等措施,可以提高成纱条干CV。     

提高CJ11.7tex纱条干均匀度的工艺配置

在生产CJ11.7tex纱的基础上分析了纱线条干均匀度的影响因素。为了提高细纱条干均匀度,对影响成纱条干均匀度的前区工艺参数、后区牵伸工艺进行了工艺配置。实验结果证明,采用较小的粗纱定量、细纱捻系数、前中罗拉隔距、较小的钳口隔距、较小的后区牵伸倍数,以及较大的前胶辊压力,采用较大前胶辊直径,适当增加粗纱捻系数等措施,可以提高成纱条干CV值。     

Effects of lattice apron density on yarn qualities in Four-line compact spinning system

In the paper, using finite element method (FEM), the effects of lattice apron density on yarn qualities in Four-line compact spinning system were studied by analyzing the numerical simulations of the airflow velocity. Firstly, three different kinds of yarns, 18.2tex (32^S), 9.7tex (60^S), and 5.8tex (100^S), were spun on FA507B spinning frame equipped with lattice aprons of mesh size 150, 120, and 100, respectively. The hairiness, breaking strength, and evenness of spun yarns were tested and comparatively analyzed. Secondly, using FEM, the numerical simulations of the airflow velocity in the condensing zone were presented. The finite element model of condensing zone was constructed according to the physical parameters of the practical system. Then, the simulation of airflow velocities on five straight lines located in the front, middle, and back of condensing zone were given. It is shown that, in the whole condensing zone, for the lattice apron with mesh size 100, the direct transverse condensing force is high, but the assisted condensing force is low and disorder, which is not beneficial for yarn qualities. Compared to the lattice apron with mesh size 150, the usage of lattice apron with mesh size 120 may be beneficial for the high-count yarn condensing or the yarn condensing under the relatively lower negative pressures. Furthermore, taking the 9.7tex as an example, the trajectory of yarn movement in the condensing zone was given using high-speed camera system OLYMPUS i-speed3. Corresponding airflow velocities along the yarn movement path were presented.     

细纱机后区压力棒牵伸的效果及牵伸倍数的优化

为提高成纱质量,在细纱机的后牵伸区加装压力棒后细纱机的后区牵伸倍数需要改变。当后区牵伸倍数过小时,粗纱在后区不能有效牵伸,使成纱的粗节增多。如果后区牵伸过大,会引起牵伸波而使成纱质量恶化。测试、分析了细纱机后区加装压力棒后纺纱效果及后区牵伸倍数对成纱条干CV值、粗细节及棉结等质量指标的影响。结果表明,纺制捻系数为109、定量为0.545g/m粗纱的最佳纺纱条件是后区牵伸倍数为1.35、中后罗拉的握持距为51 mm。     

紧密赛络纺成纱疵品率的降低措施

以精梳棉27.8tex甲配棉品种的纺制为例,探讨影响紧密赛络纺疵品率的因素。分析了吊锭间距不一致、粗纱更换不及时、网格圈周期性清洁不当及网格圈张力架弹簧失效因素对成纱疵品率的影响。研究表明,通过确保吊锭间距适当,及时更换粗纱,周期性清洁网格圈,对失效的网格圈张力架弹簧进行及时更换等措施,可有效降低紧密赛络纺成纱的疵品率。     

Oerlikon Textile Components：新型牵伸系统

在纺织产业链中,作为中间产物的纱线需紧随日益频繁的时尚变化,尤其是在服装和家用纺织品行业.纺纱机的市场也因此变得更加多样化和短期性,纺纱机显然已经发展成一个买方市场.现如今更是客户决定纱线特征和成纱质量,最重要的是,交付给客户其所需的最终产品.     

提高C14.6 tex纱成纱质量的措施

介绍了C14.6 tex纱的生产现状以及在实际生产中存在的问题，通过采用优选工艺、优化设备提出具体改进措施，从而改善了成纱质量。     

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.     

环锭紧密纺生产股线的技术

介绍了绪森公司最近开发的在环锭细纱机上采用紧密纺技术生产股线的新技术,这种“EliTwist”紧密纺股线比赛络纺生产的股线质量高,是织造高档次织物的优良原料。EliTwist紧密纺股线技术还可用以生产双股线包芯纱。     

棉纺细纱后区牵伸型式的演变与发展(二)

为说明后区牵伸运用原则,从后区牵伸中纱条紧密度测定、有捻粗纱的匀伸作用、牵伸力与输出纱条不匀关系测定、不同牵伸分配、不同粗纱捻系数下前区牵伸力测定等方面分析,指出后区牵伸为前区主牵伸创造良好的牵伸条件;其实质是使喂入前区的牵伸纱条具有较均匀结构和必要紧密度,它产生的内摩擦力场强度与前区外摩擦力场强度分布相配合,共同形成胶圈牵伸良好而稳定的总摩擦力场强度分布,有利于成纱质量的提高;表明在此前提下,后区适当承担总牵伸的一部分可以减轻前区牵伸过大的负担,这就是后区牵伸运用原则.对罗拉直线牵伸、罗拉曲线牵伸和胶圈牵伸等各种后区牵伸型式进行了摩擦力场强度分布分析比较,指出单控制辊式VC型曲线牵伸是后区牵伸型式的重大突破和发展,可发挥前、后区牵伸潜力,其总牵伸能力达50倍~150倍,成为第三代大牵伸新水平,是后区牵伸型式技术进步的标志