Prepared By : Mazadul Hasan sheshir
Batch (session 2009-2013)
Department : Wet Processing Technology
Blog : www. Textilelab.blogspot.com (visit)
Department Of Textile Engineering
I/A 251,252 Tejgaon Dhaka Bangladesh
Prepared By :
In modern installations, raw material is supplied via pipe ducting into the feed chute (of
different designs) (2) of the card. An evenly compressed batt of about 500 - 900 ktex is
formed in the chute. A transport roller (3) forwards this batt to the feed arrangement (4).
This consists of a feed roller and a feeder plate designed to push the sheet of fiber slowly
into the operating range of the licker-in (5) while maintaining optimal clamping.
The portion of the sheet projecting from the feed roller must be combed through and
opened into tufts by the licker-in. These tufts are passed over grid equipment (6) and
transferred to the main cylinder (8).
In moving past mote knives, grids, carding segments (6), etc., the material loses the
majority of its impurities. Suction ducts (7) carry away the waste. The tufts themselves
are carried along with the main cylinder and opened up into individual fibers between the
cylinder and the flats in the actual carding process.
Operating Principle of carding machine
The flats (10) comprise 80 - 116 individual carding bars combined into a belt
moving on an endless path. Nowadays some 30 - 46 (modern cards about 27) of the
flats are located in the carding position relative to the main cylinder; the rest are on
the return run.
During this return, a cleaning unit (11) strips fibers, neps and foreign matter from
the bars. Fixed carding bars (9) and (12) are designed to assist the operation of the
card. Grids or cover plates (13) enclose the underside of the main cylinder. After
the carding operation has been completed, the main cylinder carries along the fibers
that are loose and lie parallel without hooks.
However, in this condition the fibers do not form a transportable intermediate
product. An additional cylinder, the doffer (14), is required for this purpose. The
doffer combines the fibers into a web because of its substantially lower peripheral
speed relative to the main cylinder.
A stripping device (15) draws the web from the doffer. After calendar rolls (16)
have compressed the sliver to some extent, the coiler (18) deposits it in cans (17).
The working rollers, cylinder and flats are provided with clothing, which becomes
worn during fiber processing, and these parts must be reground at regular intervals.
This is a cast roller with a diameter
usually of around 250 mm. Saw-tooth
clothing is applied to it. Beneath the
licker-in there is an enclosure of grid
elements or carding segments; above
it is a protective casing of sheet metal.
The purpose of the licker-in is to pluck
finely opened tufts out of the feed batt,
lead them over the dirt-eliminating
parts under the roller and then deliver
them to the main cylinder. In high-
performance cards, rotation speeds
are in the range of 800 - 2 000 rpm for
cotton and about 600 rpm for
The cylinder is usually manufactured
from cast iron, but is now sometimes
made of steel. Most cylinders have
a diameter of 1 280 - 1 300 mm
(Rieter C 60 card 814 mm, speed up
to 900 rpm) and rotate at speeds
between 250 and 500 (to 600) rpm.
The roundness tolerance must be
maintained within extremely tight limits
– the narrowest setting distance
(between the cylinder and the doffer)
is only about 0.1 mm. The cylinder is
generally supported in roller bearings.
Clothing configuration between main
cylinder and doffer
• The cylinder is followed by the doffer,
which is designed to take the individual
fibers from the cylinder and condense
them to a web. The doffer is mostly
formed as a cast iron (or steel) drum with
a diameter of about 600 - 707 mm.
(680 mm on Rieter machines) . It is fitted
with metallic clothing and runs at speeds
up to about 300 m/min.
Web detaching using detaching rollers and transverse belts
A, main drive for the
B, drive for the
C, drive for the
delivery, i.e. doffer,
D, drive for the
cleaning roller of the
E, drive for the
cleaning roller of the
flats via the stripping
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