Air drag on yarn and package surfaces affects yarn tension, which in turn affects energy consumption and ends-down in ring spinning. This paper investigates the effects of yarn hairiness on air drag in ring spinning. Theoretical models of skin friction coefficient on the surface of rotating yarn packages were developed. The predicted results were verified with experimental data obtained from co...

Yarn-based supercapacitors having improved performance are needed for existing and emerging wearable applications. Here, we report weavable carbon nanotube yarn supercapacitors having high performance because of high loadings of rapidly accessible charge storage particles (above 90 wt% MnO2). The yarn electrodes are made by a biscrolling process that traps host MnO2 nanoparticles within the gal...

In this paper, a new yarn evenness measurement method based on machine vision is introduced, which is a direct measurement process, as opposed to other methods. Two types of yarns (i.e., same yarn count but different quality grade and same quality grade but different yarn count) are measured to determine the coefficient of variation unevenness, which can be compared with the results of USTER ME...

The paper analyzes the existing methods for obtaining threads and yarns. It has been established that largest combined (reinforced) make it possible to produce textile products with specified special properties. Tensile tests were carried out on a three-component yarn, one of components which was ferromagnetic microwire. when such thread is stretched, breakage does not occur simultaneously. Fir...

This paper illustrates the development of a system to measure the variation in yarn parameters using image processing with the help of a low cost USB web camera along with a yarn moving arrangement. The complete system comprises of yarn guides and tension control device, motor with gear box, monitor for displaying yarn parameters etc. The system enables to develop yarn diameter spectrogram and ...

air-jet weaving is an advanced weaving method with high efficiency and productivity. it is one of the most widely used methods of weaving in the world. in air-jet filling insertion, the motion of weft yarn is caused by friction between weft yarn and air blown through nozzle. after declamping and subjecting the yarn to air stream, its motion is not active but very complicated and influenced by s...

The torque in single-spun yarns is an inherent property of the twisting and bending of staple fibres during the formation of yarn combined with the effect of applied tension on the yarn. The consequences of yarn torque are well known and are widely observed as yarn instability, e.g., yarn rotation under tension; local snarling and entanglement at low loads, and as distortion in fabric, i.e., ed...

This paper presents a study to identify the type and location of yarn periodical errors applying three different signal processing approaches based on FFT – Fast Fourier Transform, FWHT-Fast Walsh-Hadamard Transform and FDFI – Fast Impulse Frequency Determination. The errors determination is applied for the mass measurement of yarn using a capacitive sensor and for the measurement of yarn diame...

Ceramic Matrix Composites (CMC) are promising future materials for jet aircraft engines. CMC parts are produced by piling fabric layers made of silicon carbide yarn. To detect defects in the parts, this study proposes a computational method in which each piece of yarn is recognized from volumetric models obtained by X-ray CT scanning. The method produces a set of curves, each of which represent...