高性能纤维的摩擦系数测试研究

本文采用Y151型纤维摩擦系数测定仪，对芳香族聚酰胺Twaron2000、Kevlar29、Kevlar49、Kevlar129和UHMWPE Dyneema SK65的高性能纤维单丝进行了摩擦系数测定，探讨了速度变化对摩擦系数的影响规律，并对比分析了各种高性能纤维摩擦系数的差异。     

高性能纤维的摩擦系数测试与分析

采用Y151型纤维摩擦系数测定仪，对芳香族聚酰胺Twaron2000、Kevlar29、Kevlar49、Kevlar129和UHMWPE Dyneema SK65 5种高性能纤维单丝进行了摩擦系数测定，探讨了速度变化对摩擦系数的影响规律，分析了各种高性能纤维摩擦系数的差异性。     

天然竹纤维基本力学性能研究

对竹原纤维及竹浆纤维的基本性能进行了测试分析,通过对各种性能分析比较,得出常温干态下,竹原纤维的断裂强度和初始模量均大于竹浆纤维,断裂伸长率小于竹浆纤维.竹原纤维钩结和结节时的断裂强度急剧下降,不到干态强度的20％,结节强度比钩结强度略大.竹原纤维与金属辊和橡胶辊的摩擦系数大于与纤维辊的摩擦系数,竹原纤维的静摩擦系数和...     

天然彩棉纤维摩擦性能研究

测试了天然彩棉纤维的摩擦系数，得出天然彩棉纤维的摩擦系数较小的结论。论述了摩擦系数对彩棉生产和彩棉织物的影响。     

粘胶短纤维摩擦系数测定方法

粘胶短纤维成品，其含油量是否合适，以及成品纤维在后续纺纱、织布的深加工中，起花、静电等问题的解决，都需要了解纤维的摩擦系数，纤维的摩擦系数是影响纤维后续纺织、加工、使用的一项重要指标。为此，找出一种简便易行的操作方法将会方便地测定出摩擦系数，为衡量成品纤维的质量提供依据。本文通俗地介绍了国产YG151型绞盘法摩擦系数测定仪的使用方法及注意事项。     

高性能纤维的摩擦系数测试与分析

采用Y15 1型纤维摩擦系数测定仪 ,对芳香族聚酰胺Twaron2 0 0 0、Kevlar2 9、Kevlar49、Kevlar12 9和UHMWPEDyneemaSK6 5 5种高性能纤维单丝进行了摩擦系数测定 ,探讨了速度变化对摩擦系数的影响规律 ,分析了各种高性能纤维摩擦系数的差异性     

苎麻牵切隔距与皮辊加压的关系分析

主要分析了新型牵切机皮辊加压量和牵切隔距的关系，通过拉伸机牵断纤维束测得纤维的平均强度，然后根据纤维的摩擦系数得出皮辊对纤维束的压力与牵切隔距的关系式，在牵切机上实验加以验证关系式的合理性。     

表面活性剂在染整加工中的应用(五)

（六）柔软作用 在染整加工中,为了使织物具有滑爽、柔软的手感,除了采用橡毯机械处理调节手感外,往往还用柔软剂进行整理。柔软整理的基本性质是赋予织物以平滑柔软性,即调节纤维与纤维间的动摩擦系数和静摩擦系数;对平滑作用,主要指降低纤维与纤维间的动摩擦系数;柔软作用是指除降低纤维与纤维间动、静摩擦系数的同时,更多地应降     

化学纤维的摩擦性能及其与纺纱关系的研究

一、问题的提出在整个纺纱工艺过程中,都要涉及到纤维之间、纤维与金属之间以及纤维与皮辊、皮圈之间的摩擦问题。纤维的摩擦系数是纺织纤维的一项主要物理特性。它又可分为静摩擦系数μ_s和动摩擦系数μ_d,共中,μ_s在一定程度上影响到纺纱过程中纤维的分梳和牵伸,对成纱的强力也有一定的影响。影响纤维摩擦系数的因素很多,如:     

摩擦、摩擦系数与质量管理(一)

一、合成纤维的摩擦系数与其可纺性及成纱质量的关系在整个纺纱工艺过程中,都要引起纤维之间以及纤维与金属之间、纤维与皮辊、皮圈之间的摩擦,这些都涉及纺织纤维的一项主要物理特性——纤维的摩擦系数.纤维的静摩擦系数μ_s(使纤维由静止到开始滑动时的最小推力有关的系数)和     

The Friction of Polyester Staple Fibres: The Effects of Speed,Processing, Spin Finish,Humidity, and Counterface-surface Roughness

Experiments are described in which a capstan method was used to measure the fibre/metal and fibre/fibre coefficients of friction of single polyester staple fibres. Tests were conducted on fibres carrying the manufacturer's spin finish, before and after partial processing into yarn, and on cleaned fibres. The cleaned fibres were tested against stainless-steel pins of roughness 0.08, 0.11, and 0.28 μm R_A, in atmospheres of 65% and below 20% relative humidity. All the tests were conducted over the speed range 0.03–290 m/min.

The spin finish is shown to have an increasing effect with processing of the fibres and is thought to be unevenly distributed in the hale fibre. The friction of cleaned fibres shows more correlation with the mechanical properties than with the delustrant content. Fibre/metal friction is lower against the rougher surfaces owing to variations in the true area of contact. Humidity affects the low-speed fibre/metal coefficients, which may indicate the presence of adsorbed-water layers on the metal surface at high humidity.     

回填工况下地下粮仓的摩擦力分析

为了分析回填工况下地下粮仓在地下水作用时的摩擦力变化情况,设计了3个材质为2mm厚钢板、仓底倾角为35°,直径分别为400 mm、500 mm、600 mm的模型筒仓A、B、C,进行了两种工况的6组注水试验。试验结果表明,模型筒仓顶部位移计数据发生突变时,工况a中,模型筒仓A、B、C水位分别为41.40 mm、39.80 mm、35.00 mm;工况b中,模型筒仓A、B、C水位分别为40.60 mm、39.00 mm、33.10 mm(p0.05)。静止阶段,模型筒仓A、B、C顶部支反力不变。上浮阶段,模型筒仓顶部支反力发生突变,工况a时,模型筒仓A、B、C水位-支反力曲线拐点水位分别为37.10 mm、27.00 mm、21.00 mm;工况b时,模型筒仓A、B、C水位分别为37.10 mm、30.05 mm、24.00 mm。由于静摩擦力的影响,模型筒仓的位移计变化滞后于支反力。静止阶段,工况a中的最大静摩擦力分别为206.17 N、316.81 N、364.16 N,均大于工况b的静摩擦力197.61 N、310.82 N、352.96 N。但其随水位的增加速度基本一致(p0.05)。上浮阶段,工况a、b的摩擦力均迅速下降,并趋于稳定。实际工程中,考虑有利因素的地下粮仓抗浮设计,可采用上浮阶段的摩擦力设计。     

Obere und untere Reibbeiwerte von sägerauhem Fichtenholz

Frietion tests have been carried out, to determine the coefficient of friction between the following material combinations: wood to wood with varying positions of the rubbing specimens; wood to steel with varying surface properties and wood to concrete. The coefficients of friction of rest and of sliding friction have mainly been determined with a pressure of 0.6 N/mm². Based on the test results and on literature evidence calculatory values for maximum and minimum coefficients of friction are suggested. These coefficients are required to indicate for example the sliding-safety-factor of bearing seaffolds, truss supports and similar constructions.     

32—A USEFUL METHOD FOR CALCULATING COEFFICIENTS OF FRICTION OF WOOL FIBRES FROM CAPSTAN MEASUREMENTS

An account is given of an investigation in which a variant of the capstan method was used to study the dependence of the frictional properties of wool fibres on the tension in the fibres when they slid at a very low speed over a rod of horn immersed in water (to which a wetting agent had been added). Some ofthe fibres had been given a mild shrinkproofing treatment with KMnO₄ in saturated salt solution. The curves relating the tensions T ₁ and T ₀ in the two ends of a sliding fibre, with T ₁ > T ₀, were found to be accurately linear in the range from T ₀=O up to T ₁=05 gf. For with-scale sliding, they all passed very close to the origin, but nevertheless the coefficient of with-scale friction,μ_w(={1/π}ln{T ₁/T ₀}), was markedly dependent on the tension owing to the high sensitivity of the logarithm to ‘zero error’ in the range of T ₁/T ₀ appropriate to with-scale sliding. For against-scale sliding, the intercept was larger and more variable, so that μ_a also depended markedly on the tension. It is suggested that the most satisfactory parameters to use for characterization of the friction are the coefficients of friction calculated from the slopes of the curves of T ₁ against T ₀, without regard to the intercepts.

It is shown that these new parameters reveal satisfactorily a previously determined difference between the shrinkproofed and the untreated fibres, namely, that the with-scale coefficient is significantly larger for the shrinkproofed fibres.

The measured coefficients for untreated fibres depend on the state of polish of the horn surface. For treated fibres, repolishing the horn greatly increases the variance of the measurements. The best conditions to use for particular applications are dicussed.     

Pressure-sensitive ‘Yarns’ and In-rope Friction Measurements

This paper describes the development of a method for measuring pressures and friction within textile structures and its use on four ropes made from two different man-made fibres.

The method employs a novel pressure-sensing ‘yarn’ element built (or pulled) into the rope and a separate measurement of the force needed to pull a short length of rope yarn out of the rope. The coefficient of friction is then simply found from the pull-out force divided by the pressure force acting on the surface area of the yarn.

Two wire-rope-construction Kevlar ropes and two multirope polyester-fibre ropes were compared, at a variety of mean axial loads (1%, 5%, and 10% of the ultimate axial load), and on first loading as against the eleventh cycle of loading. By using built-in sensors, coefficients of friction were found to range from 0.10 to 0.14 for the Kevlar 960 and from 0.24 to 0.31 for the Kevlar 961 ropes, with variations at low loads. Because of technical difficulties with the pulled-in sensors used for the polyester-fibre ropes, the friction results for these ropes were unreliable.

It is concluded that a built-in pressure-sensitive element is capable of producing valuable pressure and friction data that cannot be obtained by other means.     

50—SOME EXPERIMENTS ON THE FRICTION OF COTTON FIBRES

Some experiments on various aspects of the friction of cotton fibres are discussed in the light of their relevance to the processing of cotton. The topics covered include the friction of raw cotton, friction in fibre blends, fibre friction during twisiting, and friction in chemically treated fibres.     

植物纤维微纤维化对纸基摩擦材料磨损性能的影响

探讨了植物纤维微纤维化对纸基摩擦材料摩擦、磨损性能的影响.研究表明,植物纤维微纤维化对纸基摩擦材料的孔隙结构、界面结合性能及摩擦性能调节剂的留着性能产生重要影响.与未微纤维化的材料相比,低微纤维化度对材料的孔隙结构影响不大,但能有效提高填料的含量及界面结合强度,因而材料的动、静摩擦因数较高,磨损率较低.随着纤维微纤维化程度进一步提高,材料孔隙下降使得摩擦材料与对偶之间形成的润滑油膜不能得到有效抑制或破坏,并导致润滑油热交换能力不足,动、静摩擦因数降低,材料热衰退加剧,磨损率增加.     

纸基摩擦材料的磨损机理分析

通过对纸基摩擦材料的磨损表面及其热衰退性能进行分析,初步探讨了纸基摩擦材料的磨损机理。研究表明,在剪切力及压力的反复作用下,摩擦材料表面的纤维发生严重的磨损,并产生磨屑;其中,植物纤维的磨损更为严重。磨损表面产生严重的界面分离,甚至发生纤维的脱落。磨损时所产生的纤维磨屑及填料磨粒镶嵌于植物纤维中或陷于材料的孔隙中,不会对材料的磨损性能造成明显影响。热分析表明,磨损使得热性能较差的植物纤维发生显著的热衰退,材料的热性能下降。这些结果表明,纸基摩擦材料的磨损机理主要为黏着磨损和疲劳磨损。     

More about fibre friction and its measurements

Unfortunately, the classical empirical friction laws do not hold true for fibrous and viscoelastic materials comprising most of the textile fibres. In the second half of the twentieth century, fibre surfaces have been studied by many distinguished scientists who were able to complete numerous researches for the frictional characteristics of different types of fibres. Most of the researchers have aimed to develop a new test method and a test device that can be used to measure the frictional characteristics of fibres quickly, accurately and easily in their studies. Unfortunately, there is not a standard test method or a test device for the measurement of textile fibres' friction properties. For today's competitive marketing, the instrument for fibre testing must be very fast and accurate; otherwise, it will not be useful for commercial purposes. For example, hundreds of thousands of cotton bales should be tested within a very short period of time in terms of the length, colour and trash content of the cotton bales. Without having the data describing the properties of cotton fibres, cotton bales cannot be sold commercially in most of the countries. Therefore, it is an important factor that the fibre-testing instrument should be fast and accurate. Most of the properties of cotton fibres can be assessed by using a HVI fibre-testing instrument. In this review, the historical perspective of fibre friction studies has been demonstrated with the fibre friction measurement-testing devices.     

绢纺长吐类原料化学及超声波精练工艺探索研究

通过对超声波在绢纺长吐类原料中精练效果与传统工艺的比较,以及对超声波精练方法的可行性及超声波精练方法加工对纤维机械物理性能影响的研究,得到利用超声波精练代替现有加工工艺的可靠依据.