NOPR Community:

Effect of jerky movement of ring rail on quality of ring yarn

Fri, 01 Jun 2007 00:00:00 GMT

Title: Effect of jerky movement of ring rail on quality of ring yarn Authors: Subramanian, S; Nainar, M; Palanimurugan, M; Muthumanickam, A Abstract: A device has been designed to measure the jerkiness of ring rail of ring frame and the effect of ring rail jerky motion on the quality of yarn studied. The results show an increase in long thin faults in the yarn due to ring rail jerk. Page(s): 248-250

Complex estimation of woven fabrics bending ability

Sat, 01 Sep 2007 00:00:00 GMT

Title: Complex estimation of woven fabrics bending ability Authors: Mihailovic, Tatjana; Asanovic, Koviljka; Mihajlidi, Tatjana Abstract: The bending ability of cotton, wool and viscose woven fabrics under the action of their own weight has been examined using the direct indicators by cantilever method, and indirect indicators by disc method. The results obtained by the usage of direct and indirect indicators are found to be sensitive to raw material as well as constructional characteristics of woven fabrics. Values of direct as well as indirect indicators can be used for establishing the complex estimation of fabrics bending ability. It is found that the viscose fabric has the best bending ability and cotton (1) the poorest. Page(s): 453-458

Air flow behaviour in commingling nozzles and their influence on properties of commingled yarns

Sat, 01 Dec 2007 00:00:00 GMT

Title: Air flow behaviour in commingling nozzles and their influence on properties of commingled yarns Authors: Alagirusamy, R; Ogale, Vinayak; Bhowmick, Manick Abstract: Two types of commingling nozzles have been used to study the air flow behaviour inside the nozzle and their effects on commingling performance of glass/nylon yarns. The air flow behaviour has been analysed with computational fluid dynamics software FLUENT 6.1 and actual air flow velocities are calculated using measured air pressure. It is observed that there is a good correlation between the simulation and the measured air flow pattern. The air flow pattern in the Nozzle-1 configuration shows more turbulent zones than that in Nozzle-2. The commingled yarn properties also clearly indicate that the effectiveness of commingling is much better with Nozzle-1 configuration than that with Nozzle-2 configuration. Page(s): 414-420

Microwave absorption properties of carbon fibre containing nonwovens

Sat, 01 Dec 2007 00:00:00 GMT

Title: Microwave absorption properties of carbon fibre containing nonwovens Authors: Zhu, Hua Abstract: A variety of nonwoven containing different weight percentages of pitch-based carbon fibre has been developed using through-air thermal bonding process or the spray bonding process and studied for its microwave absorbing capacity in the microwave frequency range 8 - 18GHz. Microwave reflectivity of the nonwoven is found closely related to the carbon fibre content. Electromagnetic parameters of the component fibres in the nonwoven have also been studied. Variation in microwave absorbing capacity of the nonwoven with the carbon fibre content is expounded according to the relationship between the electromagnetic parameters and the reflection coefficient of the nonwoven, as well as the relationship between the electromagnetic parameters and the attenuation constant of the nonwoven. The carbon fibre containing nonwoven has great potential in the military application as the radar camouflage material or in the non-defense application as the electromagnetic shielding material. Page(s): 391-398