The Influence of Elimination of Roving Frame on Ring Spun Cotton Yarn Characteristics

Generally, ring spun yarns are manufactured from roving which is produced by roving frame. In this paper, an experiment has been done producing ring spun cotton yarn directly from finisher drawn sliver eliminating the roving frame. Total 3 types of yarn with the various linear density of 8 Ne, 10 Ne & 12 Ne were produced using a roving frame and without using a roving frame. In the next step, physical and mechanical properties of those yarns including unevenness, imperfections, hairiness & tenacity were investigated. The result showed that ring spun cotton yarns produced from sliver exhibited inferior physical and mechanical properties compared with samples from the conventional ring spinning system.

CALCULATION AND MEASUREMENT OF DYNAMIC EXPANSION OF ROVING FLYER

Roving flyer is an important part of roving frame. Its dynamic expansions affect the quality of rove greatly. The expansions are calculated by means of the general program SAP84 based on finite element method in this paper. Its measuring principle and usage are also described. The results of calculating and measuring are identical. The method presented in the paper is effective for studying the properties of roving flyer.

Influence of the Woven Structure on the Initial Fracture Behavior of Roving Glass Fabric Reinforced Composites

In this paper, investigation on the initial fracture behavior was carried out on roving glass woven fabric reinforced composites which were manufactured by hand lay-up method. Two kinds of roving glass woven fabrics of different FAW (Fabric Area Weight) and crimp ratio, Type A of 570 g/m2 and Type B of 800 g/m2, were adopted as reinforcement in this study. Tensile test was conducted and tensile properties were discussed on specimens of 6 degrees 0°/5°/10°/80°/85°/90°. The initial fracture behavior was observed on 0 degree and 90 degree and the fracture mechanism was compared and discussed among 5°/10°/80°/85°. The results showed that Type B has higher tensile modulus and tensile strength than that of Type A. And different initial fracture behaviors between two kinds of materials was observed and analyzed, which indicated that the crimp ratio plays an important role of woven fabric reinforced composites in fracture mechanism.

Research on Intelligent Control of Roving Frame

A new model of roving frame FA467, which uses four frequency inverters to replace the complex mechanical transmission, is discussed. A Neuron-PID is designed to reduce the effect of various parametric variations such as load inertia. To ensure the constant spinning tension all over the spinning process, a feedforward controller using iterative learning control algorithm is desigend to avoid disturbances caused by changes of temperature, humidity and so on. The simulation result is shown to illustrate the effectiveness of the proposed algorithm, and now the roving frame FA467 has been developed successfully.

Study of a New Drafting System of Rubbed Roving Frame

This paper puts forward a new drafting system of the rubbed roving frame, which consists of a nine-link gear, two slipping gears. It has brought forward a new design method of the nine-link gear and the slipping gears, and set up approximate formulas for modification coefficients of gears for the first time. And the principles of transmitting rate designing for the system are given. The calculating results demonstrate that the new design method satisfies the demands of processing technology. This mechanism has been used successfully in the kind of rubbed roving frame.

A New Thread Guide Mechanism of Rubbed Roving Frame

A new thread guide mechanism of a rubbed roving frame is developed, which consists mainly of a plate cam, a linkage and an air bag spring. Characteristics and design parameters of the air spring are explored in this study. Based on analyses of winding technology for this kind of package, the kinetic laws of the thread guide is put forward. General design equations of the cam profile are derived, and common kinetic laws of II linkage group which is used for such mechanism design is proposed. It proves theoretically that it is practicable. The experimental results indicate that it can meet the needs of technological demands, and the new thread guide mechanism has been used successfully on textile machines.

挽救MG Rove计划

这是一个长远的计划，不过MG的复苏并不是没有可能的。同样，它还可能实现赢利。AUTOCAR记者与一些知名汽车专家合作，勾勒出一项挽救这一英国著名汽车品牌的计划。

一个国人不熟悉的买家——MG Rover的中国采购

在经济全球化的今天,资本势必向着低成本国家和地区流动。作为汽车制造成本中重要的一个环节,零部件采购也遵循着成本最低化的原则。在全球各大汽车整车和零部件厂商纷纷把亚太采购中心移师中国的时候,NG Rover也不失时机地把亚太采购中心设到了上海。在中国汽车零部件采购贸易洽谈会召开的前夕,本刊对MG Rover国际资源采购亚太区经理杨诗杰(Gemma Stuart Young)女士进行了专访。

China Unveils Its First Mars Probe and Rover

A press conference was held in Beijing on August 23,marking the launch of a public competitive campaign to obtain a name and logo for China’s Mars mission.The project and its progress were introduced at the conference and the external appearance of the Mars probe and the rover was revealed.China’s Mars mission will be implemented in two steps.The objective of the first step is to achieve orbiting,landing,and roving.Mars sampling will be the purpose of the second step。

粗纱物理特性对环锭纺细纱机后区牵伸效果影响

为探究粗纱在细纱后区的形态变化和粗纱物理特性能对细纱后区牵伸效果的影响,以不同粗纱定量、捻度和纤维长度的粗纱为例,分析粗纱截面纤维分布、粗纱定量和捻度等物理特性对粗纱拉伸强力影响、粗纱须条在牵伸区的变化以及基于等长切断称重法分析牵伸效果。结果表明:在牵伸过程中粗纱须条截面从圆形变成扁平带状后又恢复成一定紧密度的类圆形;粗纱定量为450 g/(10 m),捻度为4.01和4.48捻/m的粗纱力学性能好,利用粗纱捻回产生的附加摩擦力界能有效控制纤维的运动,牵伸区内纤维变速点集中,牵伸效果好;大定量粗纱受罗拉胶辊差速影响易发生纤维分层,纤维变速点分散,需加大罗拉钳口压力予以改善;后区牵伸倍数在1.10~1.36倍以内,有利于牵伸稳定。

基于关联规则的粗纱工序断头影响因素分析

为了降低粗纱在生产过程中的断头率,提高纱线生产质量和效率,通过生产实践收集纺制C 14.6 tex和JC 24.3 tex两个品种的粗纱工序断头影响因素。使用K⁃means聚类算法对影响因素指标分别进行聚类,然后使用Apriori算法将聚类后的断头影响因素指标数据集进行关联规则挖掘。结果表明:纺制C 14.6 tex品种的粗纱工序断头影响因素关联规则有粗纱回潮率和末并定量湿重,粗纱条干CV和末并定量湿重,末并定量湿重和粗纱条干CV;纺制JC 24.3 tex品种的粗纱工序断头影响因素关联规则有粗纱捻系数和粗纱定量湿重,粗纱捻系数、粗纱条干CV和粗纱定量湿重,粗纱定量湿重和粗纱捻系数;当关联规则中的影响因素同时升高时,粗纱工序断头率增加。通过关联规则中挖掘出的信息,可为纺纱企业减少粗纱工序断头、提高纱线质量提供帮助。

“直观”与“游观”的经验性再现——对“如画观法”的溯源性思考

对“如画观法”这一立足传统又具先锋性的建筑设计观念进行溯源,回归到王澍的借鉴方式——他开启了对中国传统山水画空间观念和形式策略的“师法自然”的探索。基于刘继潮对山水画空间的本体诠释,提炼出“直观”和“游观”两种紧密联系的对于自然事物的经验性观察和感知方式,并结合王澍相关实践作品对两者进行综合剖析。

涤棉混纺段彩纱的工艺优化及风格探讨

为探讨涤棉粗纱混纺段彩纱的纺纱工艺与成纱风格,以涤棉混纺粗纱为原料,采用三罗拉牵伸法,通过HFX-A6型多功能细纱机来制备涤棉段彩纱。研究工艺参数(捻度、分段时间和牵伸倍数)对段彩纱风格(外观、结构、强伸性能、条干均匀度和毛羽)的影响,并根据其外观风格建立了段彩纱的周期结构模型。试验结果表明,增大辅纱分段时间和牵伸倍数对纱线风格具有积极的影响,而增大捻度对纱线风格具有消极的影响。当纺纱工艺的捻度为90捻/m,基纱与辅纱分段时间均为1 s,两根粗纱的总牵伸分别为22.8倍和24.0倍时,段彩纱的综合性能最为优异。

直接纱原丝筒可燃物分布的形成原理

通过对原丝筒解剖测试,分析了直接纱原丝筒不同部位的可燃物分布情况,揭示了其变化规律,并通过电子显微镜对玻璃纤维形貌进行研究。最后从浸润剂化工原料、拉丝成型工艺以及烘干技术等方面,分析了影响直接纱原丝筒可燃物含量分布的主要因素,并提出了一些改进建议和措施。

面向载人月球探测的航天员-多机异构群联合探测方案

针对载人月球探测的特殊性,对未来载人月球探测的任务需求和功能需求进行了分析。根据人机特点对人机功能分配进行论证,优化月面活动系统配置,提出了“双人一车多机”异构群联合探测的人机系统方案;针对环境巡视探测、月面资源利用、基础设施建设三类任务需求,建立了多模式人机联合探测流程规划,充分发挥人和机器人的优势,可满足全地形多功能探测作业的应用需求;最后,提出了月球车和机器人的需求及方案设想。研究成果可为后续载人月球探测提供参考依据及技术基础。

300.0tex涤黏大肚纱纺纱工艺分析

以涤纶线和涤黏粗纱为原料,利用HN5DY花式捻线机纺制300.0tex大肚纱,通过调整超喂比、中空捻度和牵伸倍数进行单一变量及正交设计试验对大肚纱进行工艺优化,并对纺制大肚纱的外观效果、结构稳定性、毛羽等指标进行直观分析和方差分析。探讨了超喂比、中空捻度和牵伸倍数3个因素对大肚纱纺制的影响程度,并确定了最佳工艺参数。结果表明,超喂比、中空捻度和牵伸倍数分别是1.07、250捻/m和3.5倍时为最佳工艺参数组合,所纺大肚纱的粗度为(2.0±0.1)mm、长度为(6.0±0.1)cm、间隔长度为(4.0±0.1)cm,为后续花式纱线的工艺优化及风格分析提供一定的理论基础。

影响玻璃纤维直接纱发黄因素的探讨

通过生产过程观察、对浸润剂发黄进行试验模拟分析,研究了玻璃纤维直接纱端面产生黄变的原因,并归纳出引起直接纱端面黄变的重要影响因素。按照影响程度的大小来看,拉丝卷绕比、拉丝张力、拉丝炉位、烘制时间和温度是决定浸润剂黄变的主要影响因素。进一步提出预防直接纱表面发黄的有效措施。

粗纱定量及捻系数对成纱质量的影响

粗纱定量及捻系数是纺纱工艺中的关键参数。通过对高支精梳纯棉纱的试纺,文章综合探讨了粗纱捻系数和粗纱定量对赛络纺纱线性能及其质量的影响,首先,考察了粗纱定量对细纱工序的影响,分析了粗纱重定量工艺模式与原理,强调了合理的粗纱定量对于保障成纱质量、减少前纺开台次数和提高生产效率的显著贡献。其次,通过调整纺纱流程中的粗纱捻系数进行成纱强力、条干变异系数(CV)、质量、捻度等指标的细致测试与分析发现,纱线质量随粗纱捻系数的增加呈现出先增加后减小的趋势。研究揭示了适当控制粗纱捻系数和定量对提高纱线品质和生产效率具有关键作用,为纺织生产提供了重要的技术指导和优化建议。

降低粗纱断头,提高生产效率

为了降低粗纱断头,提高生产效率,分析因棉网破洞破边、过棉通道挂花等前纺工序导致的粗纱断头原因及应对措施,详述通过粗纱捻系数、粗纱伸长率、专件器材及牵伸部件、工艺设计与上机合格率、机架水平、设备运行、温湿度、设备清洁、操作水平等方面控制断头的要点,总结在生产中采取跟踪处理、捻度调整等攻关措施后的具体效果。指出:降低粗纱断头率应坚持从多维度出发,全面优化生产流程;日常生产中应做好设备维护、精准工艺参数、加强人员培训、注重前后工序协同等工作,为提高纱线质量和生产效率打好基础。

赛络纺纤维逃逸损失的原因分析与测试

为提高赛络纺粘胶纱线质量水平和制成率、减少纤维逃逸损失,从纺纱原料及设备准备两方面降低赛络纺纤维逃逸的影响;对比普通赛络纺、集聚赛络纺加捻三角区纤维形态与分布,分析加捻三角区长度与纤维逃逸损失率的关系以及纤维逃逸原理;以纺制赛络纺R 7.38 tex品种为例,对比分析不同粗纱定量、喇叭口间距和输出胶辊前冲量对纤维逃逸损失率和成纱质量的影响。指出:良好的设备状态、合适的器材专件、合理的工艺参数、较低的粗纱定量、较小的喇叭口间距以及适当增加输出胶辊前冲量,可降低纤维逃逸损失率并提高纱线质量,但普通赛络纺纱的纤维损失因成纱原理限制无法避免。