CARDING - Heart of spinning The following work aims to deliver information about advancements in carding. Courtesy : Google

1. DR B R AMBEDKAR NATIONAL INSTITUTE OF
TECHNOLOGY, JALANDHAR
DEVELOPMENTS IN CARDING
BY
DHANANJAY BAGHEL

2. INTRODUCTION
 Carding is the immediate process after blow
room.
 Carding is a mechanical process that
disentangles, cleans and intermixes fibres to
produce a continuous web or sliver suitable
for subsequent processing.
 This is achieved due to the clothed rollers
moving with differential speeds.

3. OBJECTS OF CARDING MACHINE
 To individualize the fibres.
 To remove impurities.
 To clean cotton thoroughly off the lighter dirt &
trash as well as to remove a certain proportion of
neps & short fibers from the opened material.
 To convert Blow Room lap/ Chute feed sheet
into the loose, roughly parallel, untwisted strand
fibres called sliver.

4. CARDING MACHINE
 Lap feed system:

5. PARTS OF CARDING MACHINE
 FEED ROLLER AND LICKER-IN
 CYLINDER AND FLATS
 DOFFER
 TRUMPET
 COILER ARRANGEMENT

6. ADVANCEMENTS IN CARDING MACHINE
 CHUTE FEED SYSTEM
 UNIDIRECTIONAL FEED
 MULTIPLE LICKER-IN
 INCREASE IN THE CARDING WIDTH
 INTEGRATED GRINDING SYSTEM
 USE OF AUTOLEVELLERS
 DUST EXTRACTION SYSTEM

7. CHUTE FEED SYSTEM
THE FIBRE TUFTS ARE DIRECTLY FED TO THE CARD
FROM BLOWROOM.
RIETER C70

8. UNIDIRECTIONAL FEED
 It results in gentle fibre treatment because fibre feed and
licker-in rotation is in the same direction.
 The latest version of Rieter card C60 and Trützschler TC 07
feature with unidirectional feed system.

9.  The manufactures have
installed multiple licker-in
in the card.
 Generally, machines come
with 3 licker-in
arrangement.
 The purpose is better and
fine cleaning of the fibre.
MULTIPLE LICKER-IN

10. INCREASE IN THE CARDING WIDTH
 The modern machines achieve production rates of 60 - 220
kg/h, compared with output of 5 - 15 kg/h in 1970.
 Rieter C 60 Card has 50% more working width (from 1 m to
1.5 m).
 Trützschler TC 07 has the longest carding section of about
2.82 m .
 Increase in production is equivalent to increased fibre mass
on cylinder that may reduce the sliver quality and ultimately
the yarn quality.
 But since the carding surface is also increased, the
production is enhanced without hampering the sliver quality.

11. INTEGRATED GRINDING SYSTEM
 Card wire grinding is not only a troublesome job but also
time consuming.
 Therefore, grinding stones are now being installed near the
wire points of cylinder and flats.
 Rieter IGS-system has integrated grinding:
 IGS-Classic for cylinder wire points and performs
400 grinding cycles per clothing lifecycle.
 IGS-Top for flats wire points and performs 100
grinding cycles per clothing lifecycle.

12. FULL WIDTH GRINDING
ROLLER
TRAVERSING GRINDING DISC

13. USE OF AUTOLEVELLERS
 To control card sliver count variations, count CV% and
unevenness, modern cards are equipped with autoleveller.
 Medium-term leveller measures the feed mat thickness at
the feed trough and, as required, the feed roller speed is
adjusted through the control system.
 Long-term leveller measures the sliver thickness by the
step roller pair and adjusts the chute system accordingly.

14. MEDIUM-TERM LEVELLER LONG-TERM LEVELLER

15. DUST EXTRACTION SYSTEM
 There is a lot of dust removal at various stages of
carding machine.
 These areas can be:
 Licker-in
 cylinder and flats
 cylinder and doffer
 This leads to the deterioration of the working conditions
and can cause health hazards.
 Thus to prevent this, suction units are installed near
these regions that collects the dust and pass it to a
specific place.