IEEE Std 142-1991 IEEE Recommended Practice for Grounding of

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Extra info for IEEE Std 142-1991 IEEE Recommended Practice for Grounding of Industrial and Commercial Power Systems

Example text

Yarn strength initially increases with the increase of the twist level due to the increasing frictional forces between the fibres. At the same time the contribution of fibre strength to the overall yarn strength decreases. As a result yarn strength reaches its maximum value at the critical twist (Fig. 8) after which point the strength tends to decrease. The thicker yarns are generally stronger and their critical twist is lower than for the finer yarns. 4] where F is the twist factor; t is the twist level; T is the yarn count in tex units.

Plenum Press, New York. ), Society of Dyers and Colourists, Bradford, UK. Renfrew A H M (1998), Advances in Colour Science & Technology, 1(1), 12. Fujioka S and Abeta S (1982), Development of novel reactive dyes with a mixed bifunctional reactive system. Dyes and Pigments, 3, 281–294. ), Dyers & Co. Pub. Trust, Bradford, UK. 18. ), Dyers & Co. Pub. Trust, Bradford, UK. 19. ), Plenum Press, New York, 262. 20. ), Society of Dyers and Colourists, Bradford, UK. 21. Broadbent A D (2001), in Basic Principles of Textile Coloration, Society of Dyers and Colourists, Bradford, UK.

5 (Lawrence, 2003). It follows from the definition of the staple fibre yarn that the integrity of the yarn is provided by twist which is characterised by direction and twist level. Yarn twist direction (see Fig. 6) is identified by letters Z (for clockwise) or S (for anti-clockwise) twist. Yarn twist direction affects the appearance of the surface of woven and knitted fabric. Yarn twist level is measured by the number of turns of twists per unit length which is 1 m in metric and SI units and 1 in.

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