Carding | Maintenance program

From the point of view of maintaining, good yarn quality, carding is the most important process in spinning care should be taken to ensure high standard of maintenance in carding.

Preventive Maintenance means to check the machine regularly and defects are discovered and remedied before they cause a need for a major repair.


Parts to be inspected(Once in

Rating &              Action taken/

15 days)

Remarks          Repaired/Replaced

* Feed Roller ends and bush

If the part is defective

conditions for wear.

write poor and needs.

* Examine licker-in, cylinder &

Correction in rating column

doffer wire for bent, blunt and

and the parts that are

broken wire.

replaced or repaired.


* Examine under grids for dents,

broken grid & joints for


Will be entered by

maintenance in charge.



* Check all the card settings.


* Check flat comb and Brush.


* Check crosrol pressure and


scrapper blade condition.

Check   the condition of all the condensing zone   and   coiler parts.

Check the stop motion and safety devices

Check flat chain tension.

Check feed Roll/Lap roll rotation for any intermittent rotation.

Check for side shaft eccentric

Check for cleanliness of card.

Ensure material handling equipment. and their condition and Availability.

check the sharpness of moteknife.

Lubrication system

condition of all bearings.

condition of all gear / stud/ chain / belt drives.

Check for Roller vibration/Eccentricity.

Check the speed of the all rotating organs.

Check the condition of auto leveller.


Routine   Maintenance:

As per maintenance schedule, works    are carried   out as per schedule so as to maintain the   M/C   imperfect  condition with minimum wear and tear.

Nature of operation                                               Frequency

General  cleaning                                                 15 days

Half settings (Dismantling and cleaning

of licker-in, feed plate, setting of flats

to cylinder, cylinder to doffer, cylinder                       15 days

to under grid)

FULL SETTINGS: In addition to half setting

jobs, Dismantling & cleaning of cylinder

under grid, Back &   front plate, Cleaning

of Roller doffing unit, apron doffing unit,

stop motion checking, complete resetting                            1 month

SI card)

petrol cleaning of cylinder and doffer



wire to remove wax and micro dust

2 month


Grinding the cylinder, doffer wire

6 month


Grinding of flat wire (ICCO 300, 400 type)

6 month


Burnishing of flat wire (ECC0, Rappo type)

1 month


(Grinding - need not be necessary )



Stripping the cylinder & doffer wire



Metallic wire Reclothing

3 years


flat chain changing

4 years.


Removal of fluff deposits on m/c with brush



Removal of waste under the under casings

Every shift



Shirley Nep counting:

 The template consists a 32 number of hole or cells. Take a web samples in a template and count the no   of neps in each cell.

n= (1. 531 - log(34 - x) x 100)/ 0. 434 Where, n = Neps per 100 sg. inches of web.

 x=No. of cells containing neps. Nep   count  (N)   is defined as the number of neps   per    100    sq. inches   of card web forming a standard hank sliver of 0. 12   on   a card 40 inches wide.

ie., N = n x (Sliver bank/0. 12) x (card width in inches/40)


NO. of cells with Neps ( for example)








Neps/100 sq. in








Nep Rating, according to Neps/100 sq inches: 1-15 Low neps, 16-25 Average: 26 -40 High: over 40: very high neps formation. Web count Ratings: 10 to 15 Good: 20-25 Average: above 30 - poor.