Drawing slivers fault reason and remedy:
There are various types of defects in the drawing sliver produced due to procedural and mechanical defects. The causes and remedies are mentioned below: https://bdfabric.com/degree-of-combing-and-its-classification/
Table of Contents
1. High drawing sliver variation:
Reason:
A. If the top roller pressure is not correct.
B. If there is an error in the setting.
C. If the top and bottom rollers are eccentric.
D. If the size of the trumpet is not according to Hank.
E. If the stop motion does not work.
F. If the rubber of the top roller is broken.
G. If a gear tooth is broken.
H. If the weight of the top roller is not correct.
J. If good fiber is in the air suction.
Remedy:
A. The pressure of the top roller i.e. the weight method has to be adjusted.
B. The roller setting needs to be adjusted.
C. If the top and bottom rollers are eccentric, the rollers need to be changed.
D. the size of the trumpet should be done according to hank.
E. If the stop motion does not work properly, it has to be fixed.
F. If the rubber of the top roller is broken, it should be removed.
G.If the teeth of any gear are broken, it should be removed and new gear should be fitted.
H. air suction method must be correct.
2. Drawing slivers fault reason and remedy-Roller lapping in a drawing frame
Reason:
A. If the roller cover is broken or cracked.
B. If the setting of the top roller clearer is not correct.
C. If the surface of the calender roller is uneven.
D. If the humidification system is not working properly.
E. If the rubber of the top roller is uneven.
F. If there is dirt or mace in the groove of the bottom roller.
G. If the roller setting is too close or too far away.
H. if there is an extra truss in the procedural sliver.
I. Processing fibers too long compared to the setting.
J. if the front roller speed is high.
Remedy:
A. The roller cover needs to be changed.
B. The setting of the top roller clearer needs to be adjusted.
C. If it is not possible to smooth the surface of the calender roller, it needs to be changed.
D. Humidification system i.e. relative humidity should be brought to the standard level.
E. The bottom roller needs to be cleaned.
F. The roller setting needs to be adjusted.
G. Procedural sliver should be arranged in advance so that there is no truss.
H. The mixing system should be arranged so that there are no too long fibers or too small fibers.
I. The speed of the delivery roller should be kept at a tolerable level.
3. Drawing slivers fault reason and remedy-End missing:
Reason:
A. If the stop motion of the drawing frame does not work properly.
B. Due to the negligence of the worker.
Remedy:
A. If there is an error in the stop motion, it must be removed.
B. Raise the awareness of the workers.
C. Supervision must be done properly.
4. End breaks in the drawing:
Reason:
A. If the back process piecing is not correct.
B. If you feed 2 slivers instead of 1.
C. If the card sliver is thin due to the wave falling.
D. If there is excessive honeydew in cotton fiber.
E. If the top roller pressure is not correct.
F. If there is a spot on the surface of the drafting and calender roller.
G. If the set distance between the drafting rollers is too high.
H. If the ends of the gear are severely corroded.
J. If the size of the trumpet is not correct.
Remedy:
A. The piecing must be kept correct in the back process.
B. Care should be taken in sliver feeding.
C. The loss due to fiber has to be processed by setting the heat.
D. The pressure of the top roller must be kept correct.
E. If there are spots on the surface of the drafting roller and the calendar roller, they need to be replaced.
F. The setting between the rollers must be kept correct.
H. The worn gear needs to be replaced.
J. The size of the trumpet should be kept correct.
5. Drawing slivers fault reason and remedy-Impurities in sliver:
Reason:
A. If the top roller has no clearer.
B. If the setting of different clearers is not correct.
C. If the suction unit does not work properly.
D. If the card sliver is dirty.
Remedy:
A. Top roller clearer should be applied.
B. The clearer setting needs to be adjusted.
C. Check if the suction unit is working properly.
D. Make sure the card sliver is well cleaned.
6. Irregular selvage in the drawing:
Reason:
A. If the top roller pressure is not right.
B. If the sliver is spread during feeding.
C. If the footed bottom roller is broken or damaged.
D. If the pneumatic pressure is excessive.
Remedy:
A. The pressure of the top roller must be adjusted.
B. Sliver feeding should be done evenly.
C. Broken or corroded footed bottom rollers need to be replaced.
D. Pneumatic pressure must be maintained.
7. Thick and thin places:
Reason:
A. If the weight of the top roller is uneven.
B. If the roller setting is not correct.
C. If any sliver is missing in the feeding and stop motion does not work.
D. If there is a defective roller and broken gear.
Remedy:
A. The weight of the top roller must be kept correct.
B. The roller setting needs to be adjusted.
C. If the stop motion does not work, it has to be fixed.
D. Supervision must be done properly.
E. If there is a defective roller and broken gear, it needs to be replaced.
8. Irregular drafting:
Reason:
A. If the draft distribution of the drafting zone is not correct.
B. If the roller slips.
C. If the tension draft is not correct.
D. If the setting is not according to the length of the fiber.
E. If the roller is eccentric.
F. If the drafting roller is worn out and the diameter is irregular.
Remedy:
A. The draft distribution of the drafting zone should be kept correct.
B. Tension draft needs to be corrected.
C. It should be kept correct according to the length of the fiber.
D. If it is an eccentric roller, the roller must be kept correct or changed.
E. The damaged roller must be replaced.
F. The roller setting needs to be adjusted.
9. Bad coiling:
Reason:
A. If the speed of the coiler is not consistent.
B. If the sliver can is not in the right place.
C. If the coiler gear is broken.
Remedy:
A. The speed of the coiler needs to be adjusted.
B. Sliver cans should be placed in the right place.
C. If the gear is broken, it needs to be changed.
