By C A Lawrence
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Additional info for Advances in Yarn Spinning Technology
Ring spinning is one of a number of methods for assembling and twisting fibres to form a yarn of required thickness and strength to enable the yarn to sustain stresses during the various processes of conversion of yarn to fabric. To fully explain the fundamentals of the ring spinning process, a review of the general principles of yarn formation is first described. 2 43 Basic principles of spinning The construction of yarn involves the linear and lateral positioning of the required number of fibres into a fibre strand and, by suitable means, consolidating the strand so as to utilise the strength of the individual fibres in order to give the yarn strength.
Working from the back to the front, let the diameters of these rollers be d1, d2 and d3 respectively, and their rotation speeds be n1, n2 and n3. 11 Generally the roller pairs are of the same diameters so just the ratios of the roller speeds can be used. It should be noted that the low level of twist given to the roving, which is retained during hand spinning, is completely removed during roller drafting. A drafted ribbon of fibres therefore issues out of the front drafting rollers. To begin spinning, the tail of a yarn length (the seed yarn) that is already threaded through the flyer and wound onto the bobbin is placed between the nip of the front rollers, so that as the spindle rotates the twist inserted propagates to the front rollers thereby binding, or twisting, the issuing ribbon © Woodhead Publishing Limited, 2010 Overview of developments in yarn spinning technology 17 of fibres onto the seed yarn end, progressively forming a new continuous yarn length that is wound onto the bobbin.
Also called ST-yarns) [7, 22]. However, the commercial process known as Repco spinning utilises friction twisting by a pair of reciprocating rollers. The details of this system will be described in Chapter 12. 7 Wrap spinning methods Besides the use of twist to consolidate the drafted ribbon of parallel fibres that constitutes a spun structure, surface fibres protruding from the ribbon or a continuous filament (or filaments) can be made to wrap (or bind) the fibre assembly to form a yarn with usable strength.
Advances in Yarn Spinning Technology by C A Lawrence