Fibre Distribution in Friction-spun Yarns

IntroductionIt is reasonable to expect the fibre distribution in across-section of a blended yarn to have an influence on theperfor mance of the yarn. This is particularly so if one ofthe components has specific inherent property of interest .In this paper ,the specific property is fire retardancy (FR)in conex fibre . The objective is establishing the fibredistribution resulting fromvarious input sliver arrangementin friction spinning .The distribution of fibres in blended yarns has beenthes…     

织造前后浆纱物理机械性能变化的研究

研究织造前后浆纱物理机械性能的变化，有助于分析浆纱各种物理机械性能指标对浆纱可织性的影响及探讨经纱的断裂机理。测试了在织机上沿其横向分段获取的织造前浆纱试样和织造后浆纱试样的物理机械性能。分析表明，从织物中获取的“布纱”不能正确反映织造后浆纱的物理机械性能的衰减程度，应选用从前梭口荻取的“织纱”作为织造后的浆纱试样；织纱断裂强力降低率和断裂伸长率降低率为10％左右，耐磨次数降低率小于40％；浆纱断裂强力与断裂伸长率服从正态分布，而耐磨次数服从对数正态分布。     

Pre-drafting Multiple of Spandex for Spandex/cotton Core-spun Yarns

The factors that influence the properties of spandex/ cotton core-spun yarns are introduced. The pre-drafting multiple of spandex is an important parameter that influences the yarn properties such as elasticity, breaking force, breaking elongation and costs. The experiment with different pre-drafting multiple is designed. The effects of pre-drafting multiple on yarn properties are evaluated by fuzzy mathematical decision. 3.3 is the optimum pre-drafting multiple for 14.6tex + 40D spandex/cotton core-spun yarns. At this multiple, the spandex content is proper and the spandex core is less prone to breakage. The cotton fibers wrap spandex more closely and transfer more frequently between inside and outside.     

Effect of Post Spinning Modification on the PAN Precursors and Resulting Carbon Fibres

The impregnation of a special grade polyacrylonitrile(PAN) precursor fibres was carried out in a 8 wt.% KMnO4 aqueous solution to obtain modified PAN precusor fibres.The focus is primarily on the effects of modification on the structure and the pbysical properties of precursor fibres,thermal stabilised and their resulting carbon fibres,which were characterized by the combination use of densities,wide-angle X-ray diffraction(WAXD),X-ray photoelectron spectroscopy(XPS),Elemental analysis(EA),Fourier transform infrared(FT-IR) and seaming electron microscope(SEM),etc.KMnO4 as a strong oxidizer can swell,oxidize and corrode the skin of a precursor ibre,transform partly C≡N groups to C=N ones,decrease the crystal size,increase the orientation index,increase the crystallinity irdex,furthemore ircrease the densities of modified PAN precursors and resulting thermal stabilised fibres.As a result,the carbon fibres dcveloped from modified PAN fibres show,an improvment in tensile strength of 31.25% and an improvement in elongation of 77.78%,but a decrease of 16.52% in Young's modulus.     

多重变形加工长丝技术

首先简要叙述了变形加工的目的、意义及其发展概况，同时指出单一变形加工纱线形态、结构的不足之处，进而提出了多重变形加工的新概念，包括复合变形和细观变形以及讨论了它们的技术特点。最后回顾了多重变形应用成果和未来的发展前景。     

Study on Properties of Jute Fibres Spun on Ring Spinning System

Jute fibre properties,viz. linear density,mechanical properties,and fibre staple length were analyzed in this paper. Morphology,lignin content,and composition analysis for jute fibres were investigated in order to give further understanding of the fibre properties changing during the chemical treatment and yarn producing processes. The results show that jute properties are greatly changed during the processes of chemical treatment,breaking carding,and finisher carding,whereas slight changes can be found in ...     

滑阀结构对比例泵变量性能的影响

分析了滑阀结构对比例泵变量性能的影响因素，提出了滑阀主要参数的确定原则。     

关于FR方法与PRP方法收敛性定理的注记

对FR方法Al Baali收敛性定理及PRP方法Polak Ribiere收敛性定理进行了推广 .     

转杯纺复合纱的结构与性能

在经过改装的转杯纺纱机上，通过调整涤纶长丝的超喂率生产不同结构和性能的转杯纺复合纱。长丝超喂率对复合纱的外观、结构和性能均有较显著的影响。当长丝张力随长丝超喂率减小而增加时，长丝从复合纱表面逐渐趋向于分布在纱线内层。复合纱的拉伸性质、条干、毛羽等性能与长丝超喂率有密切联系。与纯棉转杯纱相比，复合纱的外观和性能均有较大程度的改善。     

Study on Spinning and Properties of PLA Yarn

The essay recommends the various properties of polylactic-acid yarns in order to know them in a new step.Designing the process and spunning of the PLA yarn,analyzing the points of the processes.The PLA yarn is processed with different methods.The properties such as the strength and elongation,the frictional resistance are analyzed.The relationship between the strength and the twist factor was determined.So the basic properties of the PLA yarn is determined.Through the comparison of various parameters,a thorough understanding of the basic properties of PLA yarn,thereby determining the best PLA yarn production and use conditions,and for the PLA yarn production and provide technical support.     

棉用阻燃剂FR的应用研究

采用棉用阻燃荆FR整理织物,讨论了整理工艺条件等对织物阻燃效果的影响.得出了最佳整理工艺条件为阻燃剂FR 800 g/L,磷酸调节pH值5,二浸二轧(轧余率85%),焙烘170℃×3 min.整理后的棉布阻燃性能可以达到B1级.通过比较阻燃整理前后试样的差热分析曲线,对阻燃机理进行了初步探讨.     

浸润剂对玻璃纤维纱线可编织性的影响研究

探讨了玻璃纤维所用浸润剂组分以及各组分含量的差异，对玻璃纤维纱线各项有关其可编织性的物理机械性能的影响。通过实验研究发现，浸润剂的组分含量都有一个最佳值点，在此值之下或之上都会给玻纤纱线的可编织性带来负面影响。这为选择合理的玻璃纤维浸润剂工艺提供了依据，对玻纤经编网格的生产具有很大的实用价值。     

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。     

摩擦包芯纱织物性能的研究

文章对棉包涤纶长丝摩擦纱、棉包锦纶高弹丝摩擦纱、棉包锦纶全牵伸丝摩擦纱以及棉包粘胶长丝摩擦纱的平纹织物的性能进行了试验研究,并将它们与纯棉环锭纱和纯棉摩擦纱的平纹织物的性能进行了比较和分析。研究结果表明,棉包涤纶长丝摩擦纱织物和棉包锦纶高弹丝摩擦纱织物在服用、舒适性等方面均优于环锭纱织物。这两种摩擦包芯纱织物作为服用织物将具有良好的发展前景。     

纤维和纱线扭转性能及扭应力松弛行为的研究综述

就纱线的扭转性能的测试方法及原理、实验和理论方面的研究成果作了回顾。测试纱线扭转性能的原理基本上为扭摆法和扭力秤法。对于纱线的扭矩大小、扭应力松弛等性能，研究者更多的是用实验手段来研究。腾纱线的扭转力学性能的理论研究主要是应用弹性力学或能量法，并结合理想螺旋线模型进行研究。复合纱线的扭转性能的实验和理论研究工作几乎很少有研究报道。     

用于熔融纺丝加工的聚丙烯腈树脂的性能研究

研究了自制的可熔融聚丙烯腈(MPAN)树脂的可熔融性及其熔体的流变性能。应用多种测试手段测定了MPAN树脂的相对分子质量、AN(丙烯腈单元)含量等。结果表明,MPAN树脂可以在190～220℃熔融挤出,其熔体为切力变稀的非牛顿流体,随温度增加,MPAN树脂熔体的流动性变好;树脂中的第二单体含量增加,MPAN树脂熔体粘度减小,其相对分子质量和AN含量应低于普通纤维级聚丙烯腈树脂。     

Research on the Properties of the Naturally Coloured Cottons

IntroductionTextile is among the industries in which harmfulsubstances would arise. The disposal of the drainage afterdyeing and finishing causes environmental pollution. Onthe other hand, questions are frequently raised regardingtextile fibres and their impact on the environment,workplace and their product safety, it is reported thatfabrics made by using synthetic fibres would cause healthhazards to the users[1].Cotton, here means the white cotton,…     

新型阻燃三元乙丙橡胶的制备及其阻燃性能研究

采用微胶囊化聚磷酸铵与季戊四醇复配(APP∶PER=3∶1)填充三元乙丙橡胶(EPDM),制备新型阻燃EPDM材料,考察膨胀型阻燃剂(IFR)的填充量对EPDM材料的燃烧性能和热学性能的影响。结果表明,APP和PER复配使用,可协同提高EPDM的阻燃性能。当IFR填充量为40%时,材料的极限氧指数(LOI)可达到31%,UL94垂直燃烧等级达到V0级;最大热释放速率下降81.2%,总释放热降低30.4%;同时EPDM材料高温区热稳定性明显提高,且材料燃烧后可形成膨胀炭层,700℃下残渣量从0.9%提高至17.0%。     

新型FR型防振锤固有频率研究

防振锤被广泛用于架空输电线以耗散微风振动的能量,减轻微风振动的强度,保护架空输电线免受疲劳损害.FR防振锤是一种新型防振锤,文章从理论和实验两方面论证了它的不对称结构,使其具有4个固有频率,因而能更好地用于防止微风振动.     

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 b...