多组分摩擦纺纬纱织物的风格特征

主要研究分析了3种用芯皮结构纬纱织造的平纹织物风格特征.3种不同的纬纱分别是芯皮均为粘纤,水溶性PVA作皮、粘胶无捻纱条作芯,PVA无捻纱条作芯、粘纤作皮.3种纱均在DREF-Ⅲ型摩擦纺纱机上按芯皮50/50比例纺成,经纱统一采用2合股纯棉纱线.将3种纬纱分别织成织物,然后用热水将PVA溶解去除.织物性能的测定结果为:织物性能与组成织物的纱线组分性能并不一致.无捻芯纱(溶掉PVA表皮)织物具有较高的拉伸强力、撕裂强力、折皱回复性和耐磨性;而空心纱(溶掉PVA作芯)织物具有丰满、蓬松的结构和良好的耐压缩性能.     

用Dref 3摩擦纺多组分纬纱织造的织物的风格特征

研究分析了3种用Dref3摩擦纺多组分纬纱织造的平纹织物的风格特征。3种不同的纬纱是：芯皮均为粘纤;水溶性PVA作皮,粘胶无捻纱条作芯;PVA无捻纱条作芯,粘纤作皮。3种纱均在Dref3型摩擦纺机上按芯皮50／50比例纺成,经纱统一采用2合股纯棉纱线。将3种纱分别织成织物,然后用热水将PVA溶解去除。织物性能的测定结果：织物性能与组成织物的纱组分性能并不一致。无捻芯纱(溶掉PVA表皮)织物具有较高的拉伸强力、撕裂强力、折皱回复性和耐磨性;而空心纱(溶掉PVA作芯)织物具有丰满、蓬松的结构和良好的耐压缩性能。     

用DREF-Ⅲ摩擦纺多组分纬纱织造的织物风格特征

分析了3种用DREF-Ⅲ摩擦纺多组分纬纱织造的平纹织物风格特征。3种纬纱组分分别为:粘包粘;PVA包粘;粘包PVA,经纱统一采用2合股纯棉纱线。3种纱均在DREF-Ⅲ型摩擦纺机上按芯皮50/50比例纺成,分别织成织物后用热水将PVA溶解去除。性能测试结果表明:织物性能与组成织物的纱组分性能并不一致,溶掉PVA表皮无捻芯纱织物具有较高的拉伸强力、撕裂强力、折皱回复性和耐磨性;而溶掉PVA作芯的空心纱织物具有丰满、蓬松的结构和良好的耐压缩性能。     

用DREF-Ⅲ摩擦纺多组分纬纱织造的织物风格特征

分析了3种用DREF-Ⅲ摩擦纺多组分纬纱织造的平纹织物风格特征。3种纬纱组分分别为：粘包粘；PVA包粘；粘包PVA，经纱统一采用2合股纯棉纱线。3种纱均在DREF-Ⅲ型摩擦纺机上按芯皮50／50比例纺成，分别织成织物后用热水将PVA溶解去除。性能测试结果表明：织物性能与组成织物的纱组分性能并不一致，溶掉PVA表皮无捻芯纱织物具有较高的拉伸强力、撕裂强力、折皱回复性和耐磨性；而溶掉PVA作芯的空心纱织物具有丰满、蓬松的结构和良好的耐压缩性能。     

用于热塑复合材料的混合纱织造性能

研究了由玻璃纤维和丙纶纤维组成的包芯编带纱、摩擦纺纱、空心锭子包缠纱以及玻璃纤维纱的织造性能。在设计的实验条件下,经过100次摩擦后,包芯编带纱表面只出现少许毛羽,纱线强力基本没有变化;摩擦纺纱的包覆纤维被完全剥离,纱线强力下降60%;空心锭子包缠纱在摩擦70次左右发生断裂;玻璃纤维纱产生大量的断丝,强力下降52%。三维织造实验表明,包芯编带纱具有优良的可织造性能,而上述其它的纱线难以进行织造加工,特别是难以织造高密织物和三维织物。     

棉型中空纱强度与PVA含量关系的研究

采用水溶性维纶纱线作纱芯,棉作外包纤维,在传统的环锭纺纱机上纺制棉包芯纱,溶去芯纱,制得棉型中空纱。并对棉型中空纱的强力与PVA含量的关系进行了试验、分析与讨论。其结果对中空纱的纺制有指导意义。     

传统型与自捻型喷气涡流纺的对比

针对喷气涡流纺纱技术气流加捻过程中落纤率较高导致纱线细节较多以及纱线结构中芯纤维平行伸直导致纱线强力较低的问题,提出自捻型喷气涡流纺纱技术,依据动摩擦原理,采用镭射激光加工处理,增大自由端纤维与空心锭接触面之间的动摩擦力,实现纤维在空心锭表面旋转运动过程中自身发生扭转后包缠到纱线中,增大纤维间的抱合力。同时基于流体力学模拟和样纱试纺实验,对比分析了传统型喷气涡流纺和自捻型喷气涡流纺空心锭结构参数、喷嘴内部近壁面处的流场特征和纱线结构性能,验证了自捻型喷气涡流纺纱技术的可行性。     

兔毛/天丝混纺中空纱针织产品性能研究

为了研究芯纱含量对织物性能的影响并解决兔毛可纺性差、纤维间抱合力差的纺纱难点,选用3种不同线密度(3.5、4.5、5.5 tex)的水溶性PVA为芯纱,兔毛/天丝混纺纱做外包纱线的中空纱,制得兔毛/天丝混纺中空纱针织产品,并进行性能测试,研究织物的透气、透湿、保暖性与芯纱含量的关系,比较退维后纱线的中空结构对织物性能的影响。结果表明:芯纱含量相同时, PVA溶解后的中空纱织物较PVA溶解前的透气、透湿、保暖性均有所提高,芯纱含量在20%～25%时,中空纱织物的性能较优异,可以兼顾较好的保暖性、透气性和透湿性,有利于扩大兔毛织物的应用范围。     

摩擦纺荨麻包芯纱的纺制及工艺研究

荨麻纤维是一种野生的天然纤维,属于麻类纤维的一种,目前国内外对荨麻纤维的开发和利用还处于起步阶段.分析了荨麻纤维的可纺性,开发出了以荨麻纤维和亚麻短纤维为包覆纤维、涤纶短纤维为芯纱的摩擦纺包芯纱,并利用正交试验,研究了纺纱速度、摩擦辊转速以及芯纱比例对纱线性能的影响,优选出荨麻纤维摩擦包芯纱的纺纱工艺范围.     

纳米级聚砜酰胺包芯纱的阻燃效果研究

探讨新型结构的聚砜酰胺纤维的阻燃性能。采用静电纺丝装置制备了分别以涤纶、维纶、聚砜酰胺为芯纱、聚砜酰胺纳米级纤维为外包纤维的包芯纱,并测试了所制得各纱线的线密度和强力及所织成织物的阻燃性。结果表明:聚砜酰胺纳米级纤维的存在提高了织物的阻燃性能;聚砜酰胺纳米级纤维包覆后,纱线断裂强力略有提高。认为:包芯纱兼顾了二元纤维的优点,充分利用芯纱良好力学性能的同时发挥了聚砜酰胺纤维的耐高温阻燃性能。     

The effect of core-sheath proportion on the characteristics of fabrics produced with hollow yarns: part II comfort and mechanical properties

The study aims to investigate the effect of hollow yarn structure and the sheath-core proportion of hollow yarns on the permeability properties of the knitted fabrics. In order to accomplish this, core yarns in the yarn count of 59 tex were produced by using cotton, viscose, wool, and polyester fibers in the sheath and different ratios of polyvinyl alcohol (PVA) in the core. After completion of yarn production on ring spinning frame, the yarns in the form of packages were used to produce plain knitted fabrics. Fabrics were then divided into two groups, one of which was washed during a time period in order to remove PVA from the core to obtain hollow yarn structure. Air and water permeability, and wicking properties of the knitted fabrics were measured before and after washing processes. Mechanical properties such as pilling and bursting strength of the fabrics were also examined. The results show that washing process and PVA proportion used to produce core spun yarns have a significant effect on the permeability and mechanical properties of the fabrics.     

Permeability properties of single jersey fabrics made of hollow yarns

In this work effect of using hollow yarns on the permeability properties of the single jersey knitted fabrics were studied. Firstly yarns were produced by ring spinning machine using cotton, viscose and acrylic fibres in the mantle and water soluble polyvinyl alcohol (PVA) fibre in the core. Single jersey fabrics were knitted and PVA core was removed subsequently by washing process to create hollow yarn. Weight, air permeability and water transmission rate properties of fabrics were measured before and after washing and compared with reference fabrics. Due to the removal of PVA fibres from the yarn core after washing treatment, air permeability and water vapour transmission rate of the all kind of single jersey fabrics which were produced with hollow yarns increased as well as weight of the fabrics decreased which will cause more comfort during any exercise. It was also found that mantle fibre type and PVA ratio have significant effect on the fabric properties.     

Impact of structural variations in hollow yarn on heat and moisture transport properties of fabrics

The use of hollow/microporous yarns plays an important role in enhancing the thermo‐physiological comfort properties of fabrics. Depending on structural variations in hollow yarn, heat and moisture regulation behaviours of fabrics can be affected significantly. In this study, three types of hollow cotton yarn fabrics, produced by introducing polyvinyl alcohol (PVA) filament in the core, PVA staple fibres in the blend and PVA filament in doubling with cotton spun yarn, are studied. All three types of pre‐hollow yarns and reference yarns are made with a variation in spinning technique (single roving/double roving) to prepare eight single jersey knitted fabrics. The hollow/microporous structure of the yarn is created by dissolving the PVA fibres using hot washing of the fabrics. On overall evaluation of the fabric’s thermo‐physiological comfort properties, the doubled hollow yarn fabrics are found to be better than other fabrics. In general, thermal resistance, thermal absorptivity, wicking and drying properties of all types of hollow yarn fabrics increase after repeated laundering, while air permeability, water vapour permeability and water absorbency of hollow yarn fabrics mostly decrease. In contrast with fabrics made from yarn produced through single roving technique, use of double roving technique only improves fabric water vapour permeability.     

The effect of core-sheath proportion on the characteristics of hollow yarns: part I mechanical properties

In the scope of this study, core yarns in the yarn count of 59 tex were produced by using cotton, viscose, wool, and polyester fibers in the sheath and different ratios of polyvinyl alcohol (PVA) in the core. After completion of yarn production on ring spinning frame, winding process was performed in order to get packages. These yarns in the form of packages were washed during a time period in order to remove PVA from the yarn structures to obtain hollow yarn structure. Yarn irregularity and yarn tensile tests were performed in the form of packages before and after washing process. As a result of these tests; it was observed that values of yarn unevenness and tensile tests were significantly influenced by the core-sheath proportion and washing process.     

Effect of structural parameters of porous yarns and fabric on air permeability and moisture transfer of double-face woven fabrics

In this study, effect of fabric structural parameters of double-face woven fabrics including kind of porous yarn namely micro-porous yarn and hollow yarn, hole size of hollow yarn, percentage of these yarns in double-face woven fabric structure, and finally weft density on air permeability and moisture transfer of woven fabrics was evaluated. These yarns were produced by using water-soluble continuous polyvinyl alcohol filaments as core part for hollow yarns and as doubling yarn in micro-porous yarn. Results revealed the effect of kind of porous yarn, hole size of hollow yarn, and weft density on air permeability and moisture transfer of woven fabrics. The percentage of porous yarns as weft did not show obvious trend. Analysis of variance was used to study the effect of these variables on air permeability and moisture transfer of double-face woven fabrics statistically.     

基于包芯纱的空芯纱加工技术

以PVA长丝或短纤为芯纱，棉纤维为外包纱生产包芯纱，并通过退维得到空芯纱，由这种空芯纱制织的织物具有许多优良的性能。文章探讨了在传统环锭细纱机上生产包芯纱，并通过退维处理得到空芯纱的加工技术；并对空芯纱织物的透气性和厚度等进行了测试与分析。     

羊绒/羊毛/涤纶复合纺及成纱拉伸性能分析

选择羊绒、羊毛和涤纶长丝在传统的环锭纺系统上进行三组分复合纺纱。通过改变三组分的喂入位置、喂入张力来获得不同结构和风格的纱线。试纺了不同捻度和混纺比的3种复合结构纱,即股线、包芯和包缠结构纱,分析了其拉伸性能。纺纱实验和测量结果表明:通过复合改善了羊绒纱的强度;纱线拉伸性能与混纺比、捻度、纱线结构之间存在相关;随着捻度的增加,3种结构复合纱的拉伸性能均符合经典临界捻度理论;复合纱的力学性能因结构不同而不同,股线结构纱拉伸性能最好,包芯结构纱次之,包缠结构纱拉伸性能则最差。     

Modelling to predict thermophysiological properties of hollow/microporous yarn fabrics

Hollow/microporous yarn spinning is a technique used to increase the bulk of yarn without increasing its weight. Hollowness in the cotton yarns has been introduced by various methods and techniques. Empirical models have been developed to predict the thermophysiological properties through structural parameters. Based on standardized multiple linear regression models, fabric’s structural parameters are related with thermophysiological properties of hollow yarn fabrics. Three basic parameters i.e. yarns packing density, inter-yarn porosity and fabric thickness have been found to relate strongly with fabric thermophysiological properties except water vapour permeability.