TT 2254-SPUN YARN TECHNOLOGY II |
RING SPINNING |
Principle of ring spinning. Detailed study of modern ring frame creel – suspension type of bobbin holder. Drafting system – angle of roller stand, fluted rollers, types of flutes – cots, aprons and their specifications – types of top roller loading systems – spring loading, pneumatic loading. Functions of yarn guide, balloon control ring, separators, rings and travellers – symmetric and asymmetric rings – ring / traveller interaction and profile matching – antiwedge ring and elliptical traveller, orbit ring / traveller, zenith ring / traveller. Spindles – spindle size, spindle drives. Traveller lag – traveller burning and control. Cop building – ring rail movements, builder motion, doffing procedure. Process parameters – speeds-settings-draft-production particulars for cotton, synthetics and blends.
Condensed yarn spinning – principle of compacting drafted fibre strand, different methods of condensed yarn manufacture, condensed yarn properties vis-à-vis conventional ring-spun yarn properties, benefits and limitations of condensed yarn spinning
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ROTOR SPINNING |
History of development of open end spinning, Principle of open end rotor spinning, Mechanism of yarn formation – fibre individualisation, fibre assembling, integration of fibres into open end of yarn, twist insertion, yarn withdrawal, Yarn structure – fibre orientation and extent, fibre migration, twist structure, packing of fibres in yarn, Raw material specification and fibre characteristics for optimum performance and yarn quality, Process parameters influencing spinning performance and yarn quality – opening roller speed and wire profile, rotor diameter, rotor speed, groove design, profile of doffing tube, Yarn characteristics – strength and extension, unevenness and imperfections, hairiness, flexural rigidity, abrasion resistance, Latest developments in rotor spinning, Economic benefits, Technological and economic limitations for production of finer yarns, End uses of rotor-spun yarns. |
FRICTION SPINNING |
Introduction, Principle of operation, History of machine developments – PSL Masterspinner, DREF-1 Friction Spinner, DREF-2 Friction Spinner, DREF-3 Friction Spinner, DREF-5 Friction Spinner, DREF-2000 Friction Spinner, DREF-3000 Friction Spinner, Yarn Formation process – fibre feed, fibre assembly, twist insertion, yarn withdrawal, Yarn structure – structure of open end friction spun yarn, structure of core-sheath type (DREF-3) friction spun yarn, Raw material requirement and fibre characteristics for friction spinning, Influence of process parameters – spinning drums’ speed, yarn withdrawal rate, friction ratio, suction air pressure, core-sheath ratio, factors influencing fibre slip and twisting efficiency, Applications fields for open-end and core-sheath type friction-spun yarns, Merits and demerits of friction spinning, Latest developments in friction spinning. |
AIR-JET SPINNING |
Introduction to false twisting, Basic principles and methods of fasciated yarn manufacture – Dupont’s rotofil process, Toray air-jet spinning process, Murata jet spinning, Murata vortex spinning, Importance of fibre characteristics for optimum spinning performance and yarn quality, Classification of fasciated yarn structure, Yarn properties, Yarn quality in relation to various process parameters – air pressure, draft, delivery rate, ribbon width, feed ratio, Developments in air-jet spinning – 5-line high drafting system, Murata twin spinning, Murata roller jet spinning, Murata vortex spinning – MVS 851, MVS 861. Applications of air-jet spun yarns. |
OTHER SPINNING METHODS |
Wrap spinning – principle of operation, raw materials for core and wrapper, yarn structure and properties, spinning limits, applications of yarns.
Double-rove spinning – operating principle, process monitor, spinning geometry, effect of strand spacing on spinning performance and yarn quality, process limitation, Introduction to solo-spun technology, difference between siro spinning and solo spinning, end uses of siro-spun and solo-spun yarns.
Core yarn spinning – basic principle and requirements of core yarn spinning, different methods of core yarn production – manufacture of core yarn in ring spinning, rotor spinning, friction spinning, air-jet spinning, raw materials for core yarn spinning, applications of core-spun yarns.
Twistless and Self-twist spinning – basic principles of yarn manufacture, yarn characteristics and end uses, latest developments. |
REFERENCE |
Text Books |
1. Klein W., Vol.4 -5, “A Practical Guide to Ring Spinning, 1987” and “New Spinning Systems, 1993" The Textile Institute, Manchester, 1987.
2. Gowda R.V.M, “New Spinning Systems”, NCUTE, IIT Delhi, 2003. |
Reference Books |
1.Chattopadhyay R. (Ed), Advances in Technology of Yarn Production, NCUTE, IIT Delhi, 2002.
2. Lawrence C.A. and Chen K.Z, “Rotor Spinning”, Textile Progress, Vol. 13, No.4, Textile Institute, U.K., 1981.
3. Basu A., "Progress in Air-jet Spinning", Textile Progress, Vol. 29, No.3, Textile Institute, U.K., 1997.
4. Ishtiaque, S.M., Salhotra K.R. and Gowda R.V.M, "Friction Spinning", Textile Progress, Vol. 33, No.2, Textile Institute, U.K., 2001. |
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