- 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.
- Elimination of impurities
& dust: Elimination of foreign material occurs
mainly in the region of the taker in (T-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.
- 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 T-in; low doffer speeds lower through
put.
- Elimination of short
fibres: Short fibres can only be eliminated if they
are passed into the clothing. Elimination of short fibres in the card must be
viewed in proportion, actually very small, fewer than 1% short fibres.
- 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.
- 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.
- Sliver formation: To deposit the fibre material, to transport it & process it further,
an appropriate product must be formed.So, carding is called heart of spinning.
Q. Describe different action occurred in card machine?
Ans.
1. Carding action: If two closed
surfaces have opposite wire direction & their speed direction or relative
motion is also opposite, then the action between two surfaces is known as
carding action.
• It is occurred between flat & cylinder.
• Here wire
direction is opposite.
• Speed direction
is opposite.
• There always
should be point against point direction result of carding action. Result of
carding action -
• Maximum individualization of fibres is achieved in this region by opposite spikes.
• Neps, short
fibres, dirt & dust are removed.
• The difference of
surface speed between cylinder & flat is
more. So, carding action is maxm occurred.
2.
Stripping action: When two close
surfaces have same wire direction & their speed direction or relative motion is also same then the action
between two
surfaces is called stripping action.
• It is occurred between T-in & cylinder.
• Same wire direction.
• Same speed direction.
• There always
should be against back action. Result of stripping action-
• Trash, neps are
transferred from cylinder to Taker in &
doffer to stripper by stripping action.
3.
Doffing action: When two close
surfaces wire points are inclined in
opposite direction
& their speed direction is same, then the action between two surfaces is called doffing action.
Doffing action
is occurred betn cylinder & doffer. Wire direction is opposite
but speed direction is same. It is special type of carding.
Sliver
formation – is done by this action.
4. Combing action:
This action take
place betn feed roller & T-in. Here, pin direction is same.
