稀疏机织物中纱线滑移阻力的测量

探讨稀疏机织物中纱线滑移阻力的测试方法.针对目前的测试方法在测试稀疏机织物中存在的不足及稀疏织物的特征,设计了一种利用钢梳测量纱线滑移阻力的方法,并分别采用该法和缝合法测得了不同经纬密的多种机织平纹网状织物中纱线的滑移阻力,分析了经纬密与织物中纱线滑移阻力的关系,认为在稀疏机织物的纱线滑移阻力测试中,钢梳法测试所得数据较缝合法更准确.     

织物结构的多项式数学模型与三维模拟

在Peirce模型的基础上,利用多项式曲线拟合的方法模拟纱线的屈曲形态,以纱线弯曲的曲率、经纬纱线的半径、几何密度、屈曲波高来计算纱线屈曲轨迹上的每个点,再通过经纬纱线的排列来展示织物的结构图.在VC 6.0开发环境下,按照多项式数学模型,利用OpenGL图形技术实现了平纹和斜纹织物结构的三维模拟.模拟时,能对图形进行移动、旋转、缩放等图形定位操作;能改变一个或几个结构参数,展现经、纬纱在织物中的屈曲交织形态,并瞬时显示改变后的三维图形;通过改变法线向量的求法,改变织物结构模拟的光照效果.     

影响网格状稀疏织物结构稳定性的因素分析

探讨影响网格状稀疏织物结构稳定性的因素。通过测试不同组织、不同纱线号数和不同经纬密的多种机织网格状稀疏织物的滑移阻力,并反复对比分析了组织、纱线号数、摩擦因数和经纬密对网格状稀疏织物滑移阻力的影响。结果表明:平纹组织织物的滑移阻力明显大于方平组织织物;在一定范围内,织物的滑移阻力随纱线号数和摩擦因数的增大而增大,随经纬密度的增大而增大。认为网格状稀疏织物的滑移阻力测试分析结果为建立织物滑移阻力预测模型提供了依据。     

平纹织物纱线截面形态经典理论探析及其泛化

平纹机织物内部纱线的截面一直被业界视为某种固定的形态，但应用可视化技术发现，基于经典的双凸截面模型存在问题，即使用微积分思路解决问题过程中，发现纱线截面变化的规律。研究结果表明，无论是单层机织物还是多层机织物，其纱线截面均呈现出多元性，而非单一形态。特别是对于接结多层纬纱的经纱，其截面沿纱线长度方向按凹凸交变的规律呈周期性变化。这一研究成果对“织物纱线恒定截面论”提出了异议，对研究纱线的真实截面形态及织物外观模拟具有参考价值。     

基于Matlab的机织物结构相三维仿真

为真实、快速、形象地显示织物,基于Peirce及其衍生模型采用正余弦函数模拟了纱线屈曲状态;利用圆形和椭圆形分别描述纱线截面形态,避免了纱线弯曲处出现尖角或交叉;加入织物多类控制参数,实现了不同纱线直径、经纬密、结构相、纱线线密度的快速变换控制。基于坐标变换原理,建立了以空间曲面描述织物三维形态的模型;采用Matlab语言进行编程,基于所建数学模型进行三维结构形态模拟;加入颜色插值、添加光源等,更好地进行了仿真效果呈现。     

机织物中纱线截面形态与集合形态模型研究

探讨机织物中纱线的截面形态及集合形态模型的应用。在分析前人研究工作的基础上,通过对实际织物中纱线截面形态进行分析,结果表明:把纱线在织物中的截面形态归结到一个统一的圆形、椭圆形、跑道圆形、凸透镜形等模型下是不科学的;并针对多组织点织物中纱线截面形态的复杂性提出了集合形态模型。指出:集合形态模型是描述纱线在织物中截面形态的一种新的思路,是某些复杂组织织物中纱线截面形态的一个广义解决办法。     

河北科技大学科研成果展示

正项目名称:带有立体织物加强筋的复合板材项目简介:以间隔机织物为增强体,开发了一种综合性能优良的三维结构复合板材,可以应用于复合材料技术领域。间隔机织物由上下两个面层和中间的连接纱线或织物组成。连接纱线可以是经纱或纬纱,也可以采用平纹织物连接,其中经接结间隔机织物加工较方便,是增强织物结构的首选。在间隔机织物上下面层的空间中可以填充泡沫材料,经过树脂复合则制得泡沫夹层复合材料板材。通过对板材的各项物理机械     

仿朦胧感面料的开发

设计合适的组织、纱线、经纬纱密度及纹样，织造了4种不同仿朦胧效果的双层织物。结果表明：表组织选用平纹、透孔等组织，里组织选用平纹组织，采用表里接结或表里换层的方式连接上下两层，表里经纬纱排列比为1∶2或相同，同时选用合适线密度、捻度及材质的经纬纱及经纬纱密度，所织造的织物具有良好的仿朦胧效果。仿朦胧感面料应选用低线密度的经纬纱，表里层经纬纱细度可相同，但经纬纱密度要小，同时表层应选用透孔组织。如果表里经纬纱排列比不同，如1∶2,则此时表层经纬纱线密度可比里层经纬纱线密度略大，但表里经纬纱密度不宜过大。如果表层经纬纱线密度比里层小，表组织可采用平纹、透孔组织，但同样经纬纱密度不宜过大。材质上应选择初始模量小的纤维或高捻度纱线。     

捆绑组织对三维正交机织复合材料拉伸性能的影响

以高强涤纶纱为原料,借助自主改造的二维小样机织造三种捆绑组织(平纹、斜纹和缎纹)的三维正交机织物,再采用真空辅助树脂传递模型工艺制作三维正交机织复合材料。重点研究三种不同的捆绑组织对三维正交机织复合材料拉伸性能的影响。结果表明:三维正交机织复合材料沿经向拉伸时断裂表面较平整,沿纬向拉伸时断裂处形状不规则;捆绑组织为缎纹的三维正交机织复合材料的拉伸性能整体最好,捆绑组织为平纹的三维正交机织复合材料拉伸性能整体最差;三种捆绑组织的三维正交机织复合材料纬向拉伸断裂强度大于经向拉伸断裂强度。     

平纹织物纱线截面形态经典理论探析及其泛化

平纹机织物内部纱线的截面一直被业界视为某种固定的形态,但应用可视化技术发现,基于经典的双凸截面模型存在问题,即使用微积分思路解决问题过程中,发现纱线截面变化的规律.研究结果表明,无论是单层机织物还是多层机织物,其纱线截面均呈现多元性,而非单一形态.特别是对于接结多层纬纱的经纱,其截面沿纱线长度方向按凹凸交变的规律呈周期性变化.这一研究成果对"织物纱线恒定截面论"提出了异议,对研究纱线的真实截面形态及织物外观模拟具有参考价值.     

Analysis of mechanical and dimensional properties of the denim fabrics produced with double-core and core-spun weft yarns with different weft densities

Elastic structures are preferred for improving the elasticity and recovery properties of denim fabrics. With the intention of improving comfort during body movements in denim jeans, 10–35% elasticity is required. In this study, the effect of the composition of double-core (dual-core) and core-spun weft yarns and weft density on the mechanical properties of denim fabrics was investigated. For this purpose, different core materials were used in the production of elastic yarns. The sheath material was cotton for all yarn types. Yarn samples were spun with the same yarn count and twist coefficient. 100% cotton Ne 8/1 Ring slub warp yarns were used as warp yarn while double-core and core-spun yarns were used as weft yarns in weaving. The weaving process was performed with three different weft density values (16, 22, and 28 weft /cm) and the other production parameters were kept constant. Twill 3/1 woven fabrics were treated according to standard denim finishing procedures. After domestic washing processes, mechanical properties of the samples were tested and statistically evaluated.     

Finite element analyses of stress distributions of three-dimensional angle-interlock woven composite subjected to three-point bending cyclic loading

This paper presents the finite element simulation of stress distribution features of 3D layer-to-layer angle-interlock woven composite undergoing three-point bending cyclic loading. With the finite element analysis model, a microstructure shell element model of the woven composite at yarn level was established to calculate the fatigue behaviors and stress distribution during cyclic loading. The stress distributions in the warp, weft yarns, and the resin regions have been calculated to show the stress difference in the woven composite. It has been observed that the warp yarns share the most part of the stress or loading, i.e. the strength warp yarn is more important than that of the weft yarn for the fatigue design. In addition, the stress distributions at the locations where the weft yarns crossover the warp yarns have been investigated. The stress degradations of the top and bottom surface of the woven composite panels were also compared with those in experimental and good agreement was found. With the stress distribution in the woven composite, the method of improving the fatigue damage tolerance was expected to be developed.     

Tensile and Frictional Properties of Wool-Cotton Union Khadi Fabrics

ABSTRACT

This paper describes the tensile and frictional behavior of wool-cotton union fabrics developed using different wool-cotton blended warp yarns, and mixed wool weft yarns spun on khadi spinning system. The tenacity and elongation at break of fabric increase with the blending of cotton with JK crossbred wool in the warp direction and high content of Australian merino wool in the weft direction, however, initial modulus decreases. The static and dynamic coefficient of friction positively correlates to the wool content in warp yarn and negatively correlates with linear density and the proportion of Australian merino wool in weft yarn.     

Damage to Continuous-filament Yarns during Weaving

A study of continuous-filament yarns and the damage caused to them during weaving is reported. In spite of experiencing greater stress and strain during weaving filaments used as warp show lower strength losses then similar filaments used as weft. This unexpected behaviour of continuous-filament yarn is explained on the basis of the different kinds of stress imposed separately on the warp and weft during weaving and of the structural sensitivity of the continuous-filament yarn to these forces. Several techniques were employed to examine and suitably explain the weakening brought about by mechanical stresses during weaving.     

机织物三维仿真中组织模块化快速构建

在机织物三维仿真中,为快速实现各种组织织物的参数化仿真,根据纱线的交织特点,提出一种将经、纬纱分别划分为8个组元的模块化构建织物组织的方法。通过建立经纱和纬纱的组元矩阵来实现织物组织的构建。采用“0”和“1”组合唯一表示经纱和纬纱组元。通过对织物组织矩阵(布尔矩阵)进行行向“ ”运算和取反后进行列向“ ”运算,分别建立了布尔矩阵与纬、经纱组元矩阵之间的映射关系。采用MatLab软件设计参数输入界面、编程并仿真,结果表明：该方法可以快速构建机织物组织,并实现机织物在不同三维模型下的参数化仿真。     

机织针织复合织物与多层双轴向纬编织物拉伸性能对比

选用玻璃纤维作经纱、纬纱和高强涤纶作针织纱分别编织机织针织复合(CWK)织物和多层双轴向纬编(MBWK)织物,测试两种织物的横向、纵向的拉伸性能,分析比较拉伸负荷和位移特征曲线。研究表明：在拉伸过程中,CWK织物MBWK织物均先由其中的经纱或纬纱,在较低的伸长下,承担较高的负荷,直至经纱或纬纱断裂,然后由针织结构,在较高的伸长下,承担较低的负荷,直至针织结构破坏;经纱和纬纱以交织形式衬入针织结构中,使得CWK织物的轴向的拉伸强度稍低于MBWK织物,但起到一定的“预牵伸”作用,可使针织纱对经纱和纬纱捆绑效果更好。     

The effect of yarn twist direction on the formability of woven fabrics

This experimental work examines the influence of the yarn twist on the formability of a woven fabric. Consideration is given to the phenomenon of bedding between warp and weft yarns, as affected by the local helix angles of bent yarns. A total of 28 plain weave woven fabrics (four groups, each with seven samples) were produced, using Solospun? yarns as warp and weft threads. The fabric bending length and the initial modulus of each sample were measured from which the formability was calculated. Results indicated that the fabrics in which the warp and weft twists are unidirectional (Z &; Z) have higher formability in comparison to those fabrics in which the warp and weft twists are opposite to each other (Z &; S). In addition, among the former fabrics the highest formability belongs to those in which the total helix angle of the warp and weft is close to 90 degree whereas the lowest formability belongs to the latter fabrics with least amount of twist.     

基于可调张力装置的芳纶织物交织阻力研究

为更加真实地模拟芳纶织物在受到冲击时产生的交织阻力变化情况,通过构建一个半经验模型来预测对于不同规格、不同预加张力情况下纱线交织阻力的数值,并设计了可调预加张力的纱线抽拔实验用夹具,分别以织物的经向宽度、纬向宽度和预加张力为变量对纱线进行抽拔实验.实验结果表明:对织物施加横向预加张力与纱线抽拔时的交织阻力呈正相关,预加...     

The Using of Nettle Fiber in Towel Production and Investigation of the Performance Properties

In this study, using of nettle fiber, a natural fiber, in towel production and the selected performance properties were examined. Six different towel samples were produced in the study. Ground warp yarns of all towels are cotton. Three different raw materials as weft yarns and two different raw materials as pile warp yarns were selected. The yarn containing nettle fiber (70% cotton/30% nettle) was used in weft direction. The performance parameters such as water absorbency, softness, quick drying of samples, and antibacterial activity for two bacteria were investigated for before and after household washing. As a result, it was seen that the nettle fiber can be used as an alternative in towel industry.     

外衣用棉经编织物结构设计与生产工艺

利用棉纱和经编技术的特性,针对棉纱的断裂强力和毛羽难以满足经编用纱要求的问题,提出了棉纱在经编中应用的关键技术;给出了从纺纱方法、整经及织造工艺过程中尝试采用的解决措施,选用集聚纺棉纱,在整经时加白油使棉纱毛羽贴伏以减小与成圈机件的摩擦,在分纱筘上将棉纱分为２ 层以减少纱线间摩擦,降低表观毛羽间的纠缠,最后从经编结构和工艺设计角度出发开发了２ 款棉经编外衣面料,利用棉纱作衬纬组织与前梳纱线形成闪避效应获得一面棉一面涤的双面效应,棉纱作成圈组织配合空穿形成斜纹效应。