Carding
Carding may defined as the reduction of an entangled mass of fibres to a filmy web by working between two closely spaced, relatively moving surfaces clothed with sharp wire points The carding is the heart of the spinning mill & well carded is half-spun-demonstrate the immense significance of carding for the final result of the spinning operation. The importance of carding is still greater where new spinning systems are concerned
Object of carding
1. Opening to individual fibres
The blow room only opens the raw material to
flocks where as the card opens it to the stage of individual fibres. This
enables the elimination of impurities & good performance of the other
operation.
2. Elimination of impurities & dust
Elimination of foreign
material occurs mainly in the region of the taker in (Licker-in).In addition to
free dust. which can be directly sucked away as in the B/R, the card also
removes a large proportion of the micro particles. The card is a good dust
removing m/c.
3. Removing of neps
The card reduces the no of
neps from the B/R Actually neps are not eliminated at the card, they are mostly
opened out. An improvement in disentangling of neps is obtained by: closer
spacing between the clothing, sharper clothing: optimal speeds of the
Licker-in, low doffer speeds lower through put
4. Elimination of short fibres
Short fibres in the Short
fibres can only be eliminated if they are pass into the clothing. Elimination
of short fibrein the card must be viewed in proportion , actually
very small , less than 1 % short fibres
5. Fibre blending
The card is the only m/c to process individual
fibres. In formation of the web & with repeated rotation of the fibres on
the main cylinder, intimate fibre with fibre mixing is achieved
6. Fibre orientation
it is often attribute the effect of parallelizing.
The card can be given, the task of creating partial longitudinal orientation of
the fibres
