Second
department of a short staple spinning mill is carding. Its importance could be
judged from this famous quote in spinning, “Carding is heart of spinning”. It
is a must needed department for every short staple spinning technique.
Objectives
of carding actions are;
- Individualization of fibers
- Orientation of fibers
- Elimination of remaining impurities
- Elimination of dust
- Disentanglement of neps
- Elimination of short fibers
- Fiber blending
- Sliver formation
Lakshmi Card Machine:
Three different models of
carding machines are manufactured by Lakshmi;
1. Lakshmi Card LC-636
2. Lakshmi Card LC-363
3. Lakshmi Card LC-333
All
three models have almost same parts and has same type of working. LC-636 is a
little bit different from other two, because of its more working width and high
production but all parts and their working is same.
Following are the parts and their working of Lakshmi carding
machine;
Chute fan: It sucks material from blow room into the chute.
ARGUS: Next to the fan an ARGUS is placed to detect any flame producing
content in material.
Chute: It is just like a pipe but in rectangular shape to carry material
from blow room department to carding department.
Material
receiver box: A box is available on card machine
in which material is fed by chute.
Chute feed
roller: A feed roller is used under
material receiver box to evenly feed the material.
Opening roller: A revolving beater opens the material before carding operations.
Lap roller: It receives material from opening roller and make an even sheet of
material called lap.
Lap plate: It just guide the lap to feeding zone of card.
Feed plate: Feed plate is placed above the feed roller of machine for even
feeding and guidance purposes.
Feed roller: Feed the material to taker-in section of card machine.
Taker-in
section: Three taker-in rollers are
available in this section. Each roller has thick saw tooth clothing on it.
Density of clothing increases gradually from 1st taker-in to 3rd
taker-in. Trash is collected under first taker-in. Taker-in prepares the
material for main carding action between cylinders and flats.
Segment bars: Each taker-in has a segment bar on it for material opening and
removal of trash particles.
Cylinder: It is responsible for the main carding action and is biggest in
size. High density needle type clothing is available on cylinder to open the
material to individual fiber level. One lay of fibers took three rounds on
cylinder.
Revolving
flats: Flats are strips of needle type
clothing, moves above cylinder in opposite direction of cylinder to disentangle
neps and orientation of fibers.
Cleaning brush: On top of the 3rd taker-in above flats a brush is used
to clean the flats from back side. It is also called back cleaning brush.
Fly comb: It is placed on back side of revolving flats to extract out fly
waste.
Bolts for gauge
setting: Nine bolts; three above revolving
flats and three under revolving flats are used to adjust flat gauge with
cylinder.
Back top plate: Also called back top set, it is on back side of cylinder just in
start of revolving flats to guide fibers.
Back stationary
flats: Three sets of stationary flats are
on back side of cylinder to aid main carding action.
Knife: Two knives are used in between back stationary flats to extract
out trash particles.
Back bottom
plate: It is at the bottom of cylinder in
back side and guide the fibers at bottom.
Front bottom
plate: It is at the bottom of cylinder on
its front side to guide fibers.
Front
stationary flats: Two sets of stationary flats are in
front side of cylinder to aid carding action.
Knife: Two knives are used between front stationary flats to remove
impurities and foreign matter.
Front top
plate: Also called front top set, is on
front side of cylinder at top.
Control stick: A control stick is attached near to front stationary flats to
control amount of doffing material.
Doffer: Doffer is another roller with thick clothing on it to doff the
material from cylinder.
Suction between
cylinder and doffer: A pipe is used in between cylinder
and doffer to suck dust and fly in this section.
Front cleaning
brush: It is on the front side of flats to
remove short fibers from revolving flats.
Suction between
doffer and stripper roll: Another
suction pipe is used to suck dust and fly in between doffer and stripper
roller.
Stripper roll: Also called redirecting roller (RD roller), is to forward or
redirect doffed fragile web to crush rollers.
Transparent
plate: It is under the stripper roller to
collect any trash particles falling down from the formed fragile web.
Crush rollers: Two rollers with spiral grooves in them are available in front of
stripper roll to crush leave particles in the web.
Trumpet: It is just a hole to form slivers from wide fragile web. It guides
web fibers to form a sliver.
Calendar
rollers: Sliver passes through calendar
rollers and is condensed by pressing.
Sliver guide: A hook type sliver guide is used to guide the sliver to coiler.
Coiler calendar
rollers: These are above the coiler to
condense the sliver and fed it to coiler.
Coiler: It is just like a round plate with hole on one side to pass the
sliver from it. It revolves above sliver can to make coils of material in can.
Can: It is a long round box with spring inside it to carry the sliver
from card machine to next draw frame.
Automatic can
changer: It uses pneumatic pressure to hange
the full can with empty can automatically.
Specifications:
Major specifications of
Lakshmi Card Machines are;
|
Attribute
|
LC-333
|
LC-363
|
LC-636
|
|||||
|
Manufacturer
|
LAKSHMI
|
LAKSHMI
|
LAKSHMI
|
|||||
|
Model
|
2011
|
2013
|
2014
|
|||||
|
Type
|
LA
7/6
|
LA
7/6
|
LA
7/7
|
|||||
|
Max.
Production
(at
100% efficiency)
|
100kg/hr
|
100kg/hr
|
200kg/hr
|
|||||
|
Running
Production
(at
88% efficiency)
|
54kg/hr
|
54kg/hr
|
96kg/hr
|
|||||
|
Weight
of feed
|
500g/m
|
500g/m
|
800g/m
|
|||||
|
No.
of taker-in
|
3
|
3
|
1
|
|||||
|
Cylinder
diameter
|
1270mm
|
1270mm
|
1016mm
|
|||||
|
Working
width
|
1
meter
|
1
meter
|
1.5
meter
|
|||||
|
Sliver
count range
|
0.08
– 0.18Ne
|
0.08
– 0.18Ne
|
0.09
– 0.25Ne
|
|||||
|
Sliver
output grains
|
75gr/yd
|
75gr/yd
|
100gr/yd
|
|||||
|
Sliver
output grains Range
|
77
± 2
|
77
± 2
|
100
± 5
|
|||||
|
Delivery
speed
|
200m/min
|
200m/min
|
235m/min
|
|||||
|
Total
no. of flats
|
82
|
97
|
101
|
|||||
|
Back
stationary flats
|
08
|
08
|
07
|
|||||
|
Front
stationary flats
|
05
|
05
|
05
|
|||||
|
Revolving
flats
|
27
|
33
|
33
|
|||||
|
Mote
knives
|
5
|
5
|
6
|
|||||
|
Efficiency
|
88%
|
88%
|
92%
|
|||||
|
Total
Waste
|
2
– 10%
|
2
– 10%
|
2
– 6%
|
|||||
|
Speed of
rollers
|
||||||||
|
Opening roller
|
1175rpm
|
|||||||
|
Feed roller
|
5-6rpm
|
|||||||
|
Doffer
|
200m/min
|
|||||||
|
Taker-in
|
1st
|
2nd
|
3rd
|
|||||
|
984rpm
|
1100rpm
|
1450rpm
|
||||||
|
Cylinder
|
515rpm
|
|||||||
|
Calendar roller
|
200m/min
|
|||||||
|
Delivery speed
|
200m/min
|
|||||||
|
Flats speed
|
160m/min
|
|||||||
|
Drafts
|
||||||||
|
Total draft
|
100
|
|||||||
|
Tension draft
|
1.01
|
|||||||
|
Sliver draft
|
1.05
|
|||||||
|
Web draft
|
1.5
|
|||||||
|
Draft between calendar roller and coiler
|
1.2
|
|||||||
|
Power Input and Connected Loads
|
||||||||
|
Motor
|
Power
(KW)
|
Motor
speed (RPM)
|
||||||
|
Main
motor
|
9.30
|
1465
|
||||||
|
Doffer
motor
|
1.80
|
1440
|
||||||
|
Web
doffing motor
|
0.55
|
552
|
||||||
|
Chute
fan motor
|
0.75
|
1250
|
||||||
|
Chute
feed motor
|
0.2
|
15
|
||||||
|
Feed
motor
|
0.37
|
11
|
||||||
|
Brush
motor
|
0.25
|
2780
|
||||||
|
Taker-in
motor
|
1.80
|
1400
|
||||||
|
Flats
and cleaning motor
|
0.014
|
80
|
||||||
|
Coiler
drive motor
|
1.50
|
1420
|
||||||
|
Can
changer
|
0.25
|
16
|
||||||
|
Control
circuit
|
0.50
|
-------
|
||||||
|
Total
power
|
17.284KW
|
|||||||
Lakshmi Card Machine
Operational Diagram:
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