The mechanism of strength reduction of sewing threads has been discussed in Part I of this paper. The effect of fabric tightness and certain thread properties like its size, coefficient of yarn‐metal friction, twist direction, number of piles, type of fibre and fibre denier on strength reduction has been studied and found to influence the severity of strength reduction of the thread.
Reports on investigations into the mechanism of sewing thread strength reduction. Results indicate that structural damage, namely, structural openness and pull‐out of fibre ends from the surface are the major cause of strength reduction and that the fibre strength reduction is found to be only marginal compared to the thread strength reduction. Cotton threads exhibit higher strength loss owing to their poor abrasion resistance. Comparatively shorter fibres in cotton threads are also found to be responsible for the higher strength reduction.
Compact spinning is a novel concept generated through re-engineering of established ring spinning process by attaching a pneumatic zone to existing ring spinning machine. Compact spinning achieves a remarkable improvement in yarn quality and yarn structure through better utilization of fibre properties. The advantageous yarn characteristics provide better opportunities for cost savings in subsequent processing stages. Another interesting aspect is the possibility of developing new textile products using compact spinning. There are three major manufacturers in the field of compact spinning machines namely, Sussen (Elite spinning), Rieter (Comfor spin), and Zinser (Air-Com- Tex 700). First launch of Elite spinning machine in India faced a setback due to few practical problems like inadequate lubricating film on ring (does not allow the maximum spindle speed to be achieved), higher maintenance cost, higher labour cost and apron clogging due to accumulation of fly. However, with further developments compact spinning will certainly be the future of ring spinning, on account of its higher productivity and yarn quality.
Optimization of Sirospun yam quality is an ongoing process. The compactness of the yam appears to be an important factor. In this paper, we show that for a given yam count, a lower draft produces a stronger and more even yarn.
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