Of polypropylene

55.06 - Synthetic staple fibres, carded, combed or otherwise processed for spinning. 5506.10 - Of nylon or other polyarnides 5506.20 - Of polyesters 5506.30 5506.90 - Acrylic or modacrylic - Other This headin covers synthetic staple fibres (including waste of synthetic staple fibres or filaments) affer they have been carded, combed or otherwise processed for spinning. In cardin , staple and waste fibres are passed through machines which render the fibres more or less para lel, and deliver them in the form of a wide web or lap which is then generally condensed into a sliver (a strand of fibres loosely combined without twist). f In combing, the carded sliver is passed through further machines which render the fibres almost perfect1 parallel and, in the case of waste, remove the shorter fibres (noils). The combed sliver is usual y wound in coils or balls, known as " tops ". Tops are also made directly fiorn filament tow by what are known as " tow-to-top " processes. the tow into staple fibres and Slivers, whether produced by carding, combing or by the " tow-to-top "processes, are drawn out into rovings - thinner strands of parallel fibres with a slight twist - which can be spun in one operation into yarn. The heading does not cover wadding (heading 30.05 or 56.01).