毛涤混纺纱弯曲刚度的分析

分析了测试纱线弯曲刚度各种方法的优缺点,着重提出采用心形法测量毛涤混纺纱的悬垂高度等参数来求得其弯曲刚度。同时探讨了影响毛涤纱弯曲刚度的一些因素,并分析了纱线弯曲刚度与相应织物弯曲刚度、纱线混纺比和捻幅的相关性。     

麻赛尔/棉转杯纺纱工艺研究

以捻系数、分梳辊速度、转杯速度为试验因子,采用单因子实验和二次通用旋转组合设计法,研究麻赛尔/棉混纺纱线性能与工艺参数之间的关系,找出最佳工艺参数;并用最佳工艺参数纺制不同混纺比的麻赛尔/棉混纺纱,比较不同混纺比对纱线性能的影响.结果表明：随着捻系数、分梳辊速度、转杯速度的增加,成纱的断裂强力均呈现出先增加后下降的变化规律;随着麻赛尔纤维含量的增加,混纺纱线的断裂强力逐渐下降.     

基于粘弹性理论研究毛涤混纺织物折皱回复行为

根据标准的折皱回复测试实验对各种混纺比的毛涤织物进行了研究．基于纺织材料的粘弹性理论，把研究对象看成是具有内摩擦约束作用的粘弹性体，利用标准线性固体模型和滑块并联组成的模型分析了不同混纺比例的毛涤织物折痕回复性，并推导出折皱回复角的回复规律方程．实验证明，该模型能较好地反映毛涤织物折皱回复角的回复规律．     

纤维分布和混纺比对毛涤混纺纱毛型感的影响

采用裁面分析了不同混纺比的毛涤混纺纱的毛型感，探讨了毛/涤混纺比与汉密尔顿指数、表面纤维混纺百分率及毛纤维有效覆盖率的关系，分析了不同混纺比的毛/涤混纺纱截面五等份圆环中的实际混纺比和填充紧密度。指出表层纤维混纺百分率是反映纱线毛型感的较为直观、方便、准确的指标，同时提出能保持毛涤混纺纱毛型感的较为合理的混纺比。     

聚酰亚胺/咖啡碳纤维混纺纱的性能研究

为了使纱线达到阻燃除臭的效果,通过将聚酰亚胺、咖啡碳2种纤维以不同混纺比混纺并进行性能测试,研究混纺纱线的混纺比与成纱品质及阻燃除臭性能的关系.研究结果表明:当聚酰亚胺混纺比为0.8时,捻系数为310的纱线拉伸性能最佳;随着聚酰亚胺混纺比的增加,纱线的阻燃效果增加除臭效果降低;当聚酰亚胺混纺比超过0.5时,才能达到一定的阻燃效果;当除臭时间超过2.5 h后,除臭效果不明显.     

不同混纺比的竹浆/棉混纺纱线的力学性能研究

对不同混纺比例的竹浆／棉混纺纱线的力学性能进行了测试和分析．结果表明，随着混纺纱线中棉含量的增加，其混纺纱线的断裂伸长率呈下降趋势，断裂强力则随着混纺纱线的混纺比的变化出现一个极低值，其曲线呈下凹形；而随着竹浆／棉混纺纱线的混纺比的变化，其弹性恢复率几乎不变．     

蜂窝微孔涤纶/竹浆纤维混纺横编产品的设计与性能

为了开发蜂窝微孔涤纶/竹浆纤维混纺横编新产品,探求纱线毛羽及横编织物扭斜的解决方法,选用18.4tex蜂窝微孔涤纶/竹浆纤维Z向单纱(70/30),采用5种捻系数比,以3根合股反向加捻成股线,并测试了股线的毛羽指数及股线定捻前后编织成的纬平针织物纵行线圈扭斜角.采用Matlab对实验数据进行处理,结果表明:股线的毛羽指数随捻系数的增大先上升后下降;纵行线圈扭斜角与捻系数比成一定线性关系;蒸纱定捻后,纵行线圈扭斜角明显减小,有效降低了纵行线圈的扭斜程度.     

K5浆料对涤／棉混纺纱浆纱工艺的影响

配制了K5、PVA含量不同的2种浆料配方,对这2种配方浆料的浆液性能、浆膜性能等进行了测试分析．分别使用这2种浆料对涤／棉混纺纱线进行上浆实验,对比分析了上浆后纱线的毛羽降低率、耐磨性能、增强率、减伸率等性能指标．结果显示,涤／棉混纺纱线上浆时加入新型浆料K5取代部分PVA后,其上浆性能得到了改善．     

白竹炭粘胶纤维/棉混纺纱线的染色技术研究

通过正交试验设计实验方案研究了白竹炭粘胶纤维/棉(70/30)混纺纱线的染色工艺,确定了不同染料染白竹炭粘胶纤维/棉混纺纱线的最佳染色工艺条件.采用最佳工艺染色后的白竹炭粘胶纤维/棉混纺纱线色泽鲜艳,色牢度优良.     

高吸水仿麻织物的纱线设计

从麻织物风格及其吸水性能的要求出发，探讨利用涤纶中空纤维设计纱线号数、混纺比，捻度的方法、提出当设计纱号为32s、混纺比80／20，设计捻度100．763捻/10cm时纺制的纱线可较好地体现中空涤纶纤维吸水性能好的特点。     

涤/棉混纺股线拉伸力学性能与捻度关系的研究

对13.1tex设计捻度为85.6捻/10cm的涤/棉(65/35)混纺环锭纱,用退捻、加捻的方法获得5种不同捻度的单纱.对同一捻度的单纱合股后反向加捻成不同捻度的合股线,测量了合股线的断裂强力、伸长、初始模量,发现同一单纱捻度的涤/棉股线,随着合股捻度增加,其断裂比强度出现4个极大值,且其分布有一定的规律.     

芯丝预加张力对摩擦包芯纱强力的影响

纺制摩擦包芯纱是提高摩擦纱强力的一个有效手段。该文对摩擦包芯纱的加捻过程进行了动力学分析,获得了加捻过程中纱线转动速度n(x)和捻度T(x)的变化规律。以棉纤维为外包纤维,对涤纶、锦纶6及粘胶长丝等三种不同材料的芯丝对芯丝预加张力对摩擦包芯纱强力影响的问题进行了试验研究。利用理论研究的结果对试验规律进行了分析和解释。     

毛涤复合纱线扭转性能及扭应力松弛行为的研究

应用自行研制的直接测量纱线扭矩装置，这里测试数种纱线的扭矩-捻度关系曲线及其在常温和热状态下的扭应力松弛关系曲线，分析相同捻度下各种纱线扭矩差异的根源，发现涤长丝与毛短纤复合纱线的特殊结构是造成复合纱线残余扭矩较大的主要原因，这里的测试结果可作为纱线的捻度设计及捻度定型工艺设计的参考依据。     

The Analysis of the Untwisting and Retwisting Methods in Determining the Twist of OE Yarn

The twists of twelve kinds of the cotton OE yarns in different machine twists and different yarn linear density have been determined by one time back twisting and twisting method, triple twisting method and double twisting method. The quantitative analysis of the measurement principles of all the untwisting and retwisting methods has been made by the writers. It is theoretically and practically concluded that for twelve kinds of the cotton OE yarns the difference between the twist determined by triple twisting method and machine twist is the lowest and there is measuring method error in determining the twist of OE yarn by all the untwisting and retwisting methods.     

对测试转杯纱捻度的几种退捻加捻法的实验分析

选用了不同号数、不同设计捻度的棉转杯纱１２种,分别采用一次退捻加捻法、二次退捻加捻法、三倍退捻加捻法、二重法测试棉转杯纱的捻度。从棉转杯纱捻度测试结果可看出,相对于设计捻度,三倍退捻加捻法的测试误差最小,其次是二次退捻加捻法和二重法,一次退捻加捻法的测试误差最大。     

长丝/短纤维复合纱捻度测试方法的探讨

提出用最大长度法测定长丝／短纤维复合纱的捻度，对两种羊毛、聚酯短纤维混合须条／聚酯长丝Sirofil纱的捻度进行了测试并同解捻法、一次退捻加捻法的试验结果进行了比较分析。结果表明：最大长度法捻度测试结果大于一次退捻加捻法而小于解捻法，与解捻法比较接近；一次退捻加捻法捻度试验结果明显偏低，不太适合于长丝／短纤维复合纱的捻度测试。     

Predicting the Tensile Curve of Polyester Twisted Ply Yarn under Large Deformation

Considering the changes of ply yarn 's structure parameters during the axial extension,a new model has been proposed for predicting the tensile curve of polyester twisted ply yarn under large deformation without the tensile strength tests.The relationships between the structural parameters and tensile properties under large deformation were considered.The feasibility and accuracy of the model were studied by comparing the predictive results and the experimental ones.The structural parameters in the model were acquired under every strain before rupture.The radial dimension and twist angle of the yarn were obtained by an observation platform and image processing technique.The true modulus of the yarn was obtained indirectly from the tensile data of the single yarn and the mathematical equations.The tensile curves of the yarns at different twist levels for predicting were plotted.The results demonstrated that the predicted curve tendency and the values were quite close to the experimental ones.The model exhibited a good applicability to predict the tensile curves for low and medium twist yarns.     

REPORT ON A PROJECT AIMED AT INCREASING THE STRENGTH OF FRICTION SPUN YARN BY USING A FALSE TWIST PROCESS

The lower strength of friction spun yarns has became a key problem that hinder the develop-ment of friction spinning,especially in high speeds and fine yarns.In this paper a project aimed atincreasing the strength of friction spun yarns by using a false twist process has been made.In re-ported experiment false twist was inserted into the yarn which has been formed on a friction spin-ning machine,so that it made the yarn untwist at first,then regain the twist.In the meantime draftwas applied to generate more tension than that which had been experienced during yarn formationon the friction spinning machine.It made the yarn reforming and the loosely bound fibres in thefriction spun yarn formed due to extremely low tension on the friction spinning machine becametighter.Results indicate that with the proper draft,tension and false twist the tenacity of processedyarn will increase more than 10%.This project is an attempt to discover whether improvements can be made and whether it isworth pursuing research into modifications of yarn structure.The results imply that if the yarntension can be raised during yarn formation on the friction spinning machine or a chance is offeredto the yarn to reform after the yarn formation the yarn tenacity will be increased obviously.