YARN AND YARN MANUFACTURING-Carding Section-4.6.1

CARDING SECTION 

Carding Section:
Carding is a process in which fibres are opened (almost to single fibre staple), parallelised and
removes dust, impurities, neps, short fibres to produce a continuous strand of fibres called
sliver of uniform weight per unit length.

Objects of Carding:
Carding is one of the most important operations in the spinning process as it directly
determines the final features of the yarn, above all as far as the content of neps and husks are
concerned. There are many objectives of the carding process and these can be summarized as:
  • Individualization of the cotton fibre at a single fibre staple state i.e. opening the tufts into
    individual fibres;
  • Elimination of the remaining impurities i.e. eliminating all the impurities contained in the fibre
    that were not eliminated in the previous cleaning operations;
  • Disentangling of neps i.e. removal of neps;
  • Selecting the fibres on the basis of length, removing the shortest ones;
  • Fibre blending and orientation;
  • Parallelising and stretching of the fibre
  • Finally produce a continuous strand of fibres called sliver of uniform weight per unit length i.e.
    transformation of the lap into a sliver, therefore into a regular mass of untwisted fibre.      

 The carding operation is carried out by the card, a machine that in practice is a system of
rotating organs, mobile and fixed flats, covered with steel spikes that go by the name of wiring.


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