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Title: Hairiness reduction in polyester spun yarns during ring spinning using air nozzles — Optimization of nozzle and other parameters
Authors: Rengasamy, R S
Kothari, V K
Patnaik, Asis
Bhatia, S K
Keywords: NozzleRing;Polyester;Swirling;Yarn hairiness
Issue Date: Dec-2006
Publisher: NISCAIR-CSIR, India
IPC Code: Int. Cl.8 D01H, D02G3/00
Abstract: Nozzle and other parameters have been optimized using factorial design approach to reduce the hairiness of ring-spun yarns as the fibre strand coming out of the nip of front roller of ring frame is passed through an air-vortex nozzle before going to the lappet. The parameters, such as axial angle of air inlets in the nozzles, diameter of yarn channel in the nozzle, air pressure supplied to the nozzles and denier of fibres used to spin the yarns, have been considered. The 45° angle for air inlets, 2.2 mm diameter of nozzles, 1.0 denier fibre and 0.9 bar (gauge) air pressure are the best combinations to obtain lowest yarn hairiness when using nozzles during spinning. Computational fluid dynamics model has been used to simulate airflow pattern inside the nozzle. Swirling effect of air, caused by the design of the nozzles, is the main reason behind yarn hairiness reduction. Vortex nature of air along with air velocity is important phenomenon in reducing yarn hairiness. Tensile and evenness properties of Nozzle Ring yarns are almost similar to those of the conventional ring yarns spun without nozzle.
Page(s): 521-528
ISSN: 0975-1025 (Online); 0971-0426 (Print)
Appears in Collections:IJFTR Vol.31(4) [December 2006]

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