Studying the Mechanical Properties of Jute/Cotton Blended Yarns Using the Weibull Model

The phenomenon of a material failure varies with its gauge length in use. In the present study, the breaking strengths of J30/C70 and J55/C45 blended yarns spun by the ring spinning technology were investigated with the employment of the equations derived from the Weibull theory. The four probability estimators of the Weibull distribution were also evaluated. The results showed that the estimator （2a） was acceptable for calculating the Weibull modulus of the jute/cotton blended yarns. With the exception of breaking strength of the J30/C70 at the gauge length of 200 ram, the breaking strengths of both blended yarn could be predicted accurately by the Eqs. （9） or （10） in this paper.

Study of Rotor Spun Basofil/Cotton Blended Yarn Quality Characteristics during Optimisation of Processing Parameters

Yarn quality characteristics are affected by processing parameters. A 36 tex rotor spun yarn of 50/50 Basofil/ cotton （B/C） blended yarn was spun, and the spinning process optimised for rotor speed, opening roller speed and twist factor. Selected yarn characteristics were studied during the optimization process. During the optimizations process yarn elongation and hairiness reduced with increase in rotor speed. Tenacity increased with increase of rotor speed. The increase in TF caused tenacity and CV of count to increase up to a peak and then started to decrease with further increase of TF.While TF caused an increase in yarn hairiness, elongation decreased to a minimum level and then started to increase with further increase of TF. CV of count and hairiness increased with increase in opening roller speed, but tenacity and elongation decreased with increase in opening roller speed. The optimization process yielded the optimum levels for rotor speed, opening roller speed and twist factor （TF） as 45,000 rpm, 6,500 rpm and 450 respectively. As per uster Standards the optimum yam showed good results for CV of count, CV of tenacity and thin places/km.

Study on the pre-process technology of knitted fabric made of cotton/vinylon blended hollow yarn by single-factor experiments

以棉／维纶混纺空心纱为研究对象，探讨了针织双罗纹织物在前处理过程中，精练剂浓度、氧漂稳定剂浓度、浴比、Na2SiO3浓度、NaOH浓度、H2O2浓度、煮漂时间、煮漂温度8个因素对针织物白度、毛细效应、顶破强力的关系。实验结果显示：NaOH浓度、H2O2浓度、煮漂时间和煮漂温度是影响织物前处理效果的主要因素，精练剂浓度、氧漂稳定刑浓度、浴比、Na2SiO3浓度对处理结果的影响则相对较小。

Effect of Blending Ratio on the Properties of Ramie/Polyester Blended Yarn

The effects of the blending ratio on the properties of Ramie/Polyester blended yarns are discussed in this paper. The experimental results show that the elongation of the yarn with the polyester content more than 40% is better than that of others. There is a lowest tenacity of the yarn corresponding to the blending ratio of 50/50 or so. The other properties of the yarn, such as the evenness and hairiness, will be improved with the increasing of the polyester content.

New Contour Detection Model Working on Gray-Scale Image of Blended Yarn Cross-Section

The traditional Contour Tracing algorithm works on the binary image. It is developed that a new model called Facula Diffusion which can work directly on gray-scaled images according to the principle of human vision. The diffusion operation is controlled by four factors including approximation, closing, length-limiting, and hit-rate. Based on this model, three shape indices, i. e., dimension index, abnormity index, and fluctuation index, were put forward to describe the shape of objects. The rule of shape indices selection was discussed subsequently. Finally, the fibers in polyester/cotton blended yam are classified and the blending ratio is determined.

Study on the Rotor Spinning Processing of Spun Silk/Cashmere Blended Yarn

This paper studies rotor spinning blended yam produced of spun silk and cashmere. Nine samples were spun, from three different opening rollers and different navels. According to the Uster test results of yam quality properties, optimum selection is done by using analysis method of combining fuzzy decision-making and fuzzy pattern classification. Experimental plan is designed based on universal rotated experimental design, and the method of confined optimization is used to optimize the speed of opening roller, the speed of rotor and twist factor, according to the results of yam quality test by Uster.

Effect of Changing Front Top Roller Pressure of Drafting Zone of a Ring Frame on the Quality of Cotton-Flax Blended Yarn

Pressure applied on the top roller of drafting zone is a vital factor on which the quality of ultimate yarn depends. Drafting zone is needed to reduce the mass per unit length of input material. Appropriate contact of top rollers with bottom rollers is necessary to ensure proper drafting. In this paper, the effects of different front top roller pressure of drafting zone on the quality of 20Ne cotton-flax blended yarns (C:L = 45:55) were studied. It was observed that a higher pressure value gives a lower co-efficient of mass variation, imperfections, hairiness and higher evenness, tenacity, elongation properties.

Finishing Effect on Warmth Property of Cotton/Kapok Blended Knitted Fabric

Nowadays,more and more natural or functional fibers are being investigated due to their utilization in thermal underwear.Kapok fiber is one of the natural cellulosic fibers whose source is the kapok plant. It has hollow body and sealed tail,which exhibits desirable features required for functional textiles of this nature. In this study,cotton / kapok( 80 /20 by mass) blended yarn with two types of yarn size 18. 5 and 14. 8 tex,respectively are knitted into plain stitches. The fabrics are undergone with an optimal preparation plan according to orthogonal design. Then,after dyeing and softening,fabric properties including thermal and water-vapour resistances, wicking property, pilling behaviour, and surface morphology,are tested and scrutinized for their candidacy for thermal underwear. The results showed that cotton / kapok blended fabrics have good thermal resistance which is significantly higher than those of cotton / modal blended fabrics,and the same water vapour resistance compared with cotton / modal blended fabrics which are normally used as underwear. Cotton / modal blended knitted fabrics has better pilling grade than cotton / kapok blended fabrics. Meanwhile, the cotton / kapok blends fabrics have good wicking property. Collectively,it was concluded that cotton / kapok blended fabric was appropriate for thermal underwear. However,the main limitation of these fabrics is their pilling properties.

Study On Modification Of Kenaf and Its Spinning Blended With Cotton

This paper deals with the chemical treatment of kenaf fi-ber and the spinning of the kenaf yarn blended with cot-ton. The experimental results show that after being treated by alkli, the properties of kenaf fiber have im-proved obviously, which made it possible to produce the yarn of kenaf blended with cotton. The results are very helpful for the utilization of kenaf fiber.

湿刺激响应型混纺纱线致动器的制备及其性能

为了进一步明晰影响天然纤维柔性致动器使用性能的关键因素,以棉纤维、海藻纤维、粘胶纤维、羊毛纤维4种具有优异吸湿性的纤维为原料,采用加捻方式制备了螺旋线圈结构的混纺纱线致动器,使用自制湿刺激致动性平台测试其收缩率及做功能力,评价以混纺纱线为原料制备的湿刺激下可伸缩响应致动器的致动性能。设计单因素方差分析以及Plackett-Burman试验,研究了各因素的影响作用。试验结果表明:相较于纯棉纱,粘胶纤维/棉混纺纱、海藻纤维/棉混纺纱对应致动器收缩率从11.8%分别提升至21.8%、20.0%;相较于羊毛纱,羊毛/粘胶纤维混纺纱对应致动器收缩率从17.55%提升至28.00%;纱线种类、线圈个数、捻度对致动器收缩率具有显著影响,而负载质量、线圈纱线数量、纱线种类对致动器做功能力具有显著影响。

纺纱工艺对色纺纱呈色的影响研究

为解决色纺纱在纺制和使用过程中出现的色差较大、色差产生具体原因不清楚等问题,结合国内外最新研究成果,分析了色纺纱呈色机理,重点总结了纤维的混和方式与纺纱工序两个重要因素对色纺纱呈色的影响,提出未来色纺纱呈色影响因素需研究的内容。结果表明:采用不同的纤维混和方式,均会对色纺纱呈色效果造成影响;在相同的加工方法下纱线捻度、线密度的不同也会导致一定的色差;环锭纺、转杯纺和喷气涡流纺等不同的成纱方式纺制的色纺纱存在色差。指出:可对细纱与纤维网、熟条、粗纱之间色差出现显著变化的机理进行探究;对不同种类的有色纤维进行混纺时,纺制出与标准样色差最小的纱线所用的纤维混和方式进行研究;研究织造方式对色纺织物造成的色差;探究不同种类染料对色纺纱呈色的影响,以便更好地控制色差。

基于有限元法的纺纱胶圈用涤棉混纺骨架线性能研究

为更好地了解纺纱胶圈用骨架线破坏过程,缓解普通胶圈在高速纺纱受力轧断频繁、纺纱质量波动明显的现象,采用有限元法对不同混纺比的涤棉骨架线机械结构进行仿真,运用ABAQUS软件建立涤棉股线的三维模型,模拟骨架线轴向受拉应力分布和变形量变化,验证了仿真模拟的有效性和可行性。在此基础上,进一步优选纺纱胶圈用骨架线的最佳混纺比,并对所纺制股线强伸性、回弹性、蠕变性、热收缩性进行测试。结果表明:T/C 75/2513.1 tex×3股线断裂强力大于1000 cN,断裂伸长率小于15%,强伸性、回弹性、蠕变性和热收缩性符合胶圈骨架线要求,综合性能较为优异。

铜改性聚酯纤维/棉混纺抗菌纱生产实践

为满足人们对服用纺织品环保健康的需求,以铜改性聚酯纤维及细绒棉为原料纺14.7 tex混纺抗菌纱,根据纤维原料特性制定纺纱工艺流程,详细介绍其清花、梳棉、并条、粗纱、细纱、络筒工序的主要工艺参数及技术要点。指出:14.7 tex铜改性聚酯纤维/棉混纺抗菌纱吸湿透气、手感柔软,具有抗菌、杀菌、抑菌效果持久等优势;通过加装粗纱防粘卷装置及合理控制梳棉车间相对湿度,解决铜改性聚酯纤维/棉混纺抗菌纱易粘卷、易产生静电等问题;通过采取“分开梳棉,统一并条”和“一道预并,三道并合”的工艺,解决两种纤维原料性能差异大、混合均匀难度大的问题;纺好铜改性聚酯纤维,除注重工艺路线设计及参数设置外,原料、设备、操作管理也是关键。

Fibre Distribution in Friction-spun Yarns

According to the yarn forming characteristics in friction spinning, the arrangement of fed sliver is designed, to get the desired fiber distribution in the resultant yarn. On the base of that, the relation between the theoretical fibre distribution and the actual fibre distribution is analyzed by use of electron microscope.

生物基功能环保纱线的开发与应用现状

为深入探究生物基功能环保纱线的工艺措施,通过查阅大量有关文献进行归纳总结,得出不同类别生物基纤维的预处理、加工过程工艺参数设定、纺纱环境及工艺原则等。指出:对于强力比较低的生物基纤维需要进行自由开松,以避免损伤纤维;对于回潮率较高的生物基纤维,需控制好车间温湿度,使纤维最好处于放湿状态,以防止纤维缠绕胶辊;对于可纺性能比较差的生物基纤维,为不影响成纱强度,其占比不超过30%;对于易产生静电的生物基纤维,为提高其蓬松性,需对纤维喷洒预处理剂,且密封处理24 h以上;对于长度较长的生物基纤维,为减小纤维损伤,开清棉采用“以梳代打,减少落棉,降低打手速度”的原则,梳棉工序采取“低速度,大隔距,适当增加锡林刺辊线速比”的原则,实现纤维快速转移。

喷气涡流纺新型纱线开发探析

为提升开发喷气涡流纺纱线的技术水平,介绍喷气涡流纺纱在我国的发展历程及存在问题,对比环锭纺、转杯纺、喷气涡流纺的优势、局限及技术特性;详细分析喷气涡流纺开发多种纤维混纺纱、包芯包覆纱、有色纱等特色纱线开发途径;总结发展喷气涡流纺需注意的问题。指出:喷气涡流纺纱尚无法替代环锭纺与转杯纺;开发喷气涡流纺纱线产品时,应避免同质化竞争,合理配置纺纱速度,不断优化纺纱工艺配置,努力拓宽喷气涡流纺纱线的应用领域。

海贝黏胶纤维混纺针织纱产品开发及纺纱工艺研究

海贝黏胶纤维、细旦涤纶纤维和棉纤维的物理性能和可纺性差异较大,为顺利纺制海贝黏胶纤维混纺针织纱,需对细旦涤纶纤维进行预处理,清梳工序应遵循短流程、多分梳、少打击、轻定量、低速度、薄喂入、多回收、小张力、快转移、小加压、大隔距、通道光洁畅通、防堵塞、大速比的工艺原则;并粗工序要确保半制品质量稳定,降低纤维缠绕罗拉和胶辊等不良现象的几率,要求各个通道光洁、畅通,确保条子质量的稳定提高;细纱工序应遵循大隔距、中捻度、重加压、中弹、中硬胶辊、中速度、小后区牵伸、小钳口、合适的温湿度、使用新型纺专器材的工艺原则,确保纤维充分梳理、均匀混合和混纺比正确等,减少纱疵数量,提高成纱质量。为提高海贝黏胶纤维混纺针织纱的品质,介绍了海贝黏胶纤维的性能特点,根据海贝黏胶纤维混纺针织纱的特点和性能,结合生产实践,通过工艺试验,研究纺纱各工序的工艺参数对混纺针织纱的影响,探讨提高海贝黏胶纤维混纺针织纱品质的有效技术措施。

灰竹炭纤维/大麻纤维/Coolplus纤维/棉精梳混纺柔洁纱的可纺性研究与生产实践

本文结合生产实践,通过设备改造和半制品及纱测试,分析和讨论各因素对灰竹炭纤维/大麻纤维/Coolplus纤维/棉精梳混纺柔洁纱质量的影响,研究前纺工序和细纱工序通过优化工艺参数、采用新型纺纱专件、合理控制车间的温湿度等,明显地提高了灰竹炭纤维/大麻纤维/Coolplus纤维/棉精梳混纺柔洁纱质量。

抗菌热湿舒适复合功能服用面料的性能

为开发热湿条件下穿着健康舒适的抗菌服用面料,以桑蚕丝为经纱,蜂窝抗菌涤纶纤维、天丝、蜂窝抗紫外涤纶纤维、蜂窝玉石涤纶纤维等混纺为纬纱,通过改变纬纱种类、织物组织及纬密等设计并试织了A、B两个系列共16种织物;并对其吸湿速干、抗菌与热传递性能等进行测试,运用模糊综合分析法对其抗菌性能、热湿舒适性进行评价。结果表明:当纬纱中含有天丝成分时织物吸湿速干性能更佳,随着织物组织浮长变短、纬密增大,其吸湿速干性能整体呈下降趋势;织物具有优良的抗菌性,纬纱中蜂窝抗菌涤纶纤维含量越高,织物抗菌性能越好。织物热阻随着纬纱中天丝含量增加而减小,当含有蜂窝玉石涤纶纤维时织物热传递性能最佳;组织浮长更短的织物热传递性能更优。模糊综合分析结果表明,A系列中以天丝蜂窝抗菌涤纶纤维蜂窝抗紫外涤纶纤维(306010)为纬纱并以16枚加强纬缎织造的织物抗菌热湿舒适性能最佳,B系列中纬密为46根cm时织物抗菌热湿舒适性能最佳。

混纺比对PLA棉混纺纱力学性能的影响

为了研究混纺比对PLA棉混纺纱力学性能的影响关系,制备了PLA含量为10%~90%的9种混纺纱以及纯PLA纱、纯棉纱,并对其力学性能进行测试。将混纺纱中各组分纤维的强伸曲线用纯PLA纱和纯棉纱的强伸曲线替代,建立混纺纱强伸性能预测模型,以提升模型预测的精准度。结果表明:试验所用PLA/棉的临界混纺比为70/30,当PLA含量低于70%时,混纺纱的断裂强度随着PLA含量的增加逐渐下降,而断裂伸长率趋于稳定;当PLA含量高于70%时,混纺纱的断裂强度和断裂伸长率都逐渐增大;混纺纱力学性能指标的实测值与模型预测值具有高度一致性,体现了预测模型的准确性。认为该预测模型为预测混纺纱力学性能提供了一种比较简便的方法。