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.
CHECKLIST FOR PREVENTIVE MAINTENANCE
| 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. |
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| * Examine under grids for dents, broken grid & joints for soldering. | Will be entered by maintenance in charge. |
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| * Check all the card settings. |
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| * Check flat comb and Brush. |
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| * Check crosrol pressure and |
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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 |
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| wire to remove wax and micro dust | 2 month |
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| Grinding the cylinder, doffer wire | 6 month |
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| Grinding of flat wire (ICCO 300, 400 type) | 6 month |
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| Burnishing of flat wire (ECC0, Rappo type) | 1 month |
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| (Grinding - need not be necessary ) |
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| Stripping the cylinder & doffer wire | Daily |
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| Metallic wire Reclothing | 3 years |
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| flat chain changing | 4 years. |
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| Removal of fluff deposits on m/c with brush |
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| Removal of waste under the under casings | Every shift |
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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) | 1 | 4 | 10 | 15 | 20 | 25 | 32 |
| Neps/100 sq. in | 3 | 12 | 35 | 58 | 89 | 133 | 280 |
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.
