锦/氨纶机械包覆纱包覆度的设定

纺制了不同包覆度的锦纶/氨纶机械包覆纱.对成纱性能进行了研究.分析了断裂强力、断裂伸长率与包覆度的关系.得到了锦纶/氨纶机械包覆纱的最佳包覆度.     

锦／氨纶包覆纱拉伸力学性能与包覆度的研究

一定规格的锦纶丝、莱卡丝在空心锭子纺纱机上纺制了一系列不同包覆度的锦纶／氨纶包覆纱，并对成纱性能进行了拉伸实验分析，得到了包覆纱断裂强力、断裂伸长率与包覆度间的相应规律。     

锦纶莱卡包覆纱拉伸性能与包覆度的关系

用一定规格的锦纶丝、莱卡长丝在空心锭纺纱机上纺制了一系列不同包覆度的锦纶莱卡包覆纱,并对其成纱性能进行了拉伸试验分析,得到了包覆纱断裂强力、断裂伸长率与包覆度之间的相应规律.     

锦纶／氨纶包覆纱拉伸性能与包覆度的关系

选取一定规格的锦纶丝、氨纶丝在包覆丝机上纺制一系列不同包覆度的锦纶／氨纶包覆纱，并对成纱性能进行了拉伸实验分析，得到了包覆纱断裂强力、断裂伸长率与包覆度之间的相应规律。     

中空捻度对苎麻/PP包覆纱性能的影响

制备出苎麻/pp包覆纱,研究中空捻度对包覆纱外观、麻含量、力学性能及包覆纱线结构的影响,结果表明,制备的苎麻/PP包覆纱预制件,随着中空捻度的增大,包覆纱中苎麻含量呈下降趋势。高档位参数下输出的包覆纱拉伸过程中表现出多层断裂行为,芯纱的断裂与包覆紧度有着密切的关系。随着包覆紧度的增加,苎麻纱线的断裂强力随之上升,并出现多层断裂现象。     

涤纶氨纶包覆纱性能测试与分析

研究涤纶氨纶包覆纱的性能.介绍了包覆纺纱机构并对外包涤纶长丝细度不同的7种涤纶氨纶包覆纱进行了拉伸和沸水收缩试验.结果表明:随外包涤纶长丝细度的增加,涤纶氨纶包覆纱的断裂强力逐渐增大,但是增大幅度却逐渐下降;断裂伸长率基本稳定;沸水收缩率先稳定而后出现减小趋势.     

锦纶粘胶粗纱包覆纱的纺制以及纱线性能分析

为了探讨锦纶粘胶粗纱包覆纱的纺制工艺和包覆纱性能特点,主要对锦纶粘胶粗纱包覆纱纺制方法进行了探讨,并对成纱性能进行了测试和分析.包覆纱的断裂强力在一定范围内是随包覆度增加而增加的,但当包覆度达到一定程度时成纱强力就明显开始下降.     

特种玄武岩缝纫线的制备工艺及其性能

为制备具有高强、高模、耐化学腐蚀以及抗原子氧等性能的玄武岩高性能缝纫线，利用空心锭包覆纺纱机构，选用聚酰胺长丝为外包覆纱，对双股无捻玄武岩长丝进行双向包覆，研究不同捻度、不同线密度外包覆纱对其拉伸断裂强力及耐磨性能的影响，并分析了包覆纱断裂形貌。结果表明：所纺制的包覆纱强力相较芯丝均有提高，断裂强力提升23%～29%;在一定捻度变化区间内，捻度的增加会使包覆纱断裂强力呈现先升高后降低的趋势，使耐磨程度呈现先减弱后增强的趋势，且在650捻/m时断裂强力最高；不同线密度外包覆纱对芯纱有不同的赋强作用，线密度越大成纱强力越高；芯纱拉伸断裂形态通常为2种，即在表面包覆间距处出现不同程度凸起或呈原纤化劈裂。     

中空捻度对苎麻/聚丙烯包覆纱性能的影响

将花式纱线的包覆纱工艺引入连续纤维增强材料制作工艺中,制备出苎麻/聚丙烯包覆纱,研究了中空捻度对包覆纱外观形貌、苎麻含量、纱线力学性能及包覆纱线结构的影响。结果表明,制备的苎麻/聚丙烯包覆纱预制件,随着中空捻度的增大,包覆纱中苎麻含量呈下降趋势。高功率下输出的包覆纱拉伸过程中出现多层断裂现象,芯纱的断裂与包覆紧密度有着密切的关系。随着包覆紧密度的增加,苎麻纱线的断裂强力随之上升,并出现多层断裂现象。     

包覆度对包覆纱应变传感器基本传感性能的影响

弹性包覆纱具有螺旋包缠结构,在纱线应变传感器的设计中得到了广泛应用。但是,目前还没有关于包覆纱结构参数与其传感性能之间关系的研究。针对包覆纱的结构参数——包覆度和包覆纤维结构,分别制作了包覆度20～40捻/cm的单层和双层包覆纱线,并进行聚吡咯原位聚合形成导电纱,通过测试在拉伸应变下的电阻响应,评价其作为传感器的灵敏性、敏感阈值和重复稳定性。试验结果显示:包覆纱应变传感器的电阻响应随包覆度不同而变化,灵敏性在包覆度为40捻/cm时最好,能检测应变低至0.5%的拉伸运动;单层包覆结构传感器的包覆度越小,重复稳定性越好,而双层包覆结构正好相反。     

芯纱刚性对包芯纱的包芯性及织物悬垂性的影响

在环锭细纱机上试生产了几种不同芯纱的毛型包芯纱，并试织了相对应的织物。通过测试这些毛型包芯纱的不同芯纱的抗弯刚度，找出了芯纱抗弯曲性能对芯纱包覆效果和对织物悬垂性能的影响。研究了芯纱抗弯曲刚度与芯纱包覆效果和织物悬垂性的关系。     

A comparative study on properties of dual-core yarns

Core-spun yarns containing Spandex have been widely used for the production of elastic textile materials. However, it has been encountered various problems not only during the usage but also during textile processes due to its high recovery property. In order to solve these problems, multicomponent core-spun yarns called as dual-core (DC) yarns, have been developed. DC yarns can be produced on the modified ring spinning machine in two different ways. In the first method, previously combined two core yarns are fed simultaneously, whereas in the second method, two core yarns are given separately into the centre of sheath fibre bundle. In present study, it was aimed to research the effect of these production methods on yarn features. Polyester and Spandex core components and cotton wrapping fibres were brought together in both two ways and the properties of multicomponent core-spun yarns were compared with cotton ring counterparts for three different yarn counts.     

Studies on the static and dynamic properties of different types of polyester industrial yarns

Four major types of polyester industrial yarns, viz. high tenacity (HT), high modulus low shrinkage (HMLS), low shrinkage (LS) and super low shrinkage (SLS) polyester yarns, were studied for their static and dynamic properties. An attempt has been made to establish a linkage between static and dynamic properties of these yarns with its structure and with its end applications. HMLS and HT polyester yarns have lower tan δ and work loss, which are the desired characteristics required for its end applications which include tire and conveyer belt. Higher overall orientation and higher fraction of tie molecules helped to achieve these properties in HT and HMLS polyester yarns. LS and SLS polyester yarns are mostly used for static applications. Low thermal shrinkage is the key requirement for the downstream processes of these yarns. Lower amorphous orientation in these two yarns is primarily responsible for achieving very low thermal shrinkage. A good co-relation has been established between the peak temperature of work loss (in slow speed hysteresis test) and the peak temperature of tan δ (in high-speed dynamic test).     

纳米抗菌涤/棉针织产品开发与性能研究

选用纳米抗菌涤/棉混纺纱,开发了3种纬编针织面料及其针织内衣产品。测试了纳米抗菌涤/棉混纺纱的性能,制定了纬编织造工艺和染色后整理工艺,测试了所开发面料的服用性能和抗菌性能。研发结果表明:纳米抗菌涤/棉混纺纱具有良好的服用舒适性和抗菌功能,适于开发针织内衣产品。     

纳米抗菌涤/棉针织内衣研发与性能研究

选用纳米抗菌涤/棉混纺纱,测试了纱线的基本性能,开发了以平针添纱、双罗纹和二色彩横条罗纹为纬编结构的针织物和内衣产品,给出了纬编织造和后整理的工艺与参数,分析了所开发面料的服用性能和抗菌功能。结果表明:该纳米抗菌涤/棉混纺纱具有良好的服用舒适性能和抗菌功能,适于纬编针织内衣产品的开发。     

Thermo-physiological comfort characteristics of polyester air-jet-textured and cotton-yarn fabrics

Air-jet-textured polyester yarns were produced using two feed yarns differing in filament fineness and number of filaments. By varying the overfed rates of feed yarns and changing their positions in core and effect, five textured yarns were produced. Woven fabrics were prepared using these textured yarns as weft and cotton yarns in warp. To study the effect of air-jet-texturing parameters on the thermo-physiological comfort characteristics of fabric, the woven fabrics were tested for thickness, thermal properties, transverse wicking and air permeability. It is observed that thermal conductivity and resistance of fabrics are not influenced by the texturing parameters/textured yarn structure. These properties are mainly dependent on the entrapped air present in fabrics. Thermal absorptivity is a transient phenomenon of heat flow reflecting that the ‘warm-cool feeling’ effect of fabrics depends on smoothness/roughness of fabric surface. Fabrics with smooth surfaces have higher thermal absorptivity values as they provide a large area of contact with human skin. The roughness of fabrics depends on the number of surface loops and filament fineness. Transverse wicking of fabrics depends on the size, continuity and alignment of the capillaries present in the core of textured yarns.     

36—THE BREAKING MECHANISM OF TWO-PLY NYLON 6 CONTINUOUS-FILAMENT YARNS

The breaking mechanism of two-ply nylon 6 continuous-filament yarn is investigated, and the breakage of the yarn under simple tensile-loading conditions is compared with that of a filament subjected to the same loading. The simplest types of model yarn were prepared for this purpose. These yarns were ruptured at a low rate of extension, and the fracture morphologies of the filaments in the yarns were inspected by scanning electron microscopy. Two typical kinds of morphological feature are obtained in these yarns. In order to understand the breaking mechanism of the yarn, the cause of these features is discussed on the basis of the breaking mechanism of a single filament.     

Tensile behavior of staple fiber yarns,part IV: experimental verification of predicted stress–strain curves

In this paper, specific stress–strain curves were predicted for viscose, cotton, and polyester yarns spun by ring and rotor technologies. The average fiber-specific stress–strain curves were used to predict yarn-specific stress–strain curves. The predicted yarn-specific stress–strain curves captured the experimental yarn-specific stress–strain curves well both in shape and position for the three studied yarn types. However, higher prediction error was observed relatively in polyester yarns due to more slippage of fibers in these yarns. All rotor yarns exhibited higher difference between experimental and predicted results which might be the result of the nature of the twist in rotor yarn.     

Development and characterization of conductive ring spun hybrid yarns

Development of conductive yarns for smart textile applications is the most demanding area of research these days. This study was aimed to investigate the effect of yarn constructional parameters, and relative humidity on electromechanical properties of conductive ring spun hybrid yarns. Stainless steel (SS) fibre was blended with polyester and viscose fibre separately on 12% and 24% weight basis to produce hybrid conductive yarns at three different levels of twist factor. The electromechanical properties of yarns were evaluated in response to change in blend type, blend ratio, twist factor, and relative humidity. The content of SS fibre is found to be more effective followed by the twist factor and blend type to govern the linear electrical resistance (LER) of conductive yarns. In addition, on increasing relative humidity, the LER of viscose stainless steel (VS) hybrid yarns are found to drop significantly than that of polyester stainless steel (PS) hybrid yarns.     

Investigation on moisture management properties of knitted fabrics produced from vortex-spun yarns

Abstract

The aim of this study was to investigate the liquid moisture management performance of knitted fabrics produced from vortex-spun yarns using different kinds of fibers and ratios. For this purpose, the vortex-spun yarns with 19.7 tex were obtained in different blend ratios in Murata Vortex Spinner by using different fibers. Then, these yarns were knitted in a circular knitting machine at two different stitch lengths and dyed considering fiber types. Moisture management properties of the produced fabrics were tested. The results revealed that moisture management properties of vortex knitted fabrics were much affected by fiber types in comparison with fabric tightness. Modal and nylon fibers have shown very positive results in terms of moisture management performance. The vortex-spun yarns having a low diameter, high shape values that are more rounded, and high density improved moisture management performance of the fabrics whereas the hairy yarns and higher fabric thickness reduced it.