Drawing process: causes of 6 types of defective products and preventive measures

1. Clip the cotton sliver into the hanging flower Causes: Mainly due to the unevenness of each channel, rupture of the sliver tube and aging of the air suction bucket leather strip…

1. Clip the cotton sliver into the hanging flower

Causes: Mainly due to the unevenness of each channel, rupture of the sliver tube and aging of the air suction bucket leather strips.

Preventive measures: Each channel is polished smooth and burr-free, sliver cans are repaired in a timely manner when cracks occur, leather straps are replaced in a timely manner when they are aging, and operation patrols are strengthened to deal with problems in a timely manner.

Impact on post-processing processes: causing roving breakage, bad roving and slubs or wrong wefts on the fabric surface.

2. Thick and thin strips

Causes: ① Automatic stop failure, resulting in too many strands or too few strands; ② The cotton sliver is pleated and fed after the machine, the lap is too long or the pressure is poor, etc.; ③ The cotton sliver is too long or too short due to poor splicing. And the wrapping is too tight.

Preventive measures: ① Electrical failures should be repaired in time; ② Implement operating methods carefully and strengthen patrols; ③ Strengthen mechanical inspection and repair; ④ Do a good job in preventing defects.

Impact on subsequent processes: causing roving breakage and wrong weft defects.

3. Impurity strips

Reasons: ① The cleaning work is not timely, the cleaning method is wrong, and there is a slapping problem; ② The air suction bucket or the return flannel cloth fails.

Preventive measures: ① Carry out all cleaning tasks in a timely manner according to the cleaning schedule, and do not tap when cleaning; ② The suction bucket or rotating flannel must always be kept in good condition.

Impact on post-processing: causing roving breakage and slub defects.

4. Tops

Reasons: ① The surface roughness value of each part of the sliver and cotton mesh channel is too high and there are flowers; ② The mouth of the sliver can is rough; ③ The sliver can capacity is too full; ④ The humidity in the workshop is too low; ⑤ The surface roughness value of the upper and lower rollers is too high. high.

Preventive measures: ① Strengthen equipment maintenance and repair or replace sliver cans; ② Doff cans at a fixed length; ③ Strengthen temperature and humidity management.

Impact on post-processing: causing uneven dryness and slub defects.

5. Oil stain strips

Causes: ① Improper oiling of rubber rollers or coil gears; ② Cotton slivers falling to the ground and stained; ③ Oil hand joints; ④ The drafting part is not wiped clean when wiping the car flat; ⑤ Oil leakage from the gear box or pinion box.

Preventive measures: ① Strengthen inspections and wipe away oil stains at any time; ② Do not hold tampons with oily hands, do not join joints, and do not drop tampons to the ground.

Impact on the post-processing process: causing oil warp and oil weft defects on the fabric, affecting the quality of the machine.

6. Serious unevenness

Causes: ① Poor pressure or rubber roller and roller beating, rubber roller skew, concave center, lack of oil, big and small ends, etc.; ② Wrapping of rubber rollers, rollers and failure to remove the thin strip after wrapping; ③ Drafting gear bite Defective, worn or missing teeth; ④ The top roller has a concave center and a large number of flowers, the top roller is not pressurized enough, or the pressure roller deviates from the center of the top roller, or the pressure difference between the two ends is too large, the roller spacing moves, the top roller or the bottom roller Wrapping thin flowers; ⑤ The pressure rod is bent and deformed, the position of the pressure rod is too low, and the control force on the cotton web is too strong, and the drafting problem occurs; ⑥ The bearing is damaged; ⑦ The tooth shape error of the drafting gear is too large, and the radial direction of the ring gear Large jump; ⑧ The drafting gear key is loose; ⑨ The air suction and cleaning effect is not good, and the flying particles are caught in the cotton net.

Preventive measures: ① Strengthen equipment maintenance and inspection; ② Remove thin strips when rubber rollers or rollers are found.

Effects on the post-processing process: causing large-area quality degradation, uneven dryness and regular defects on the cloth surface.

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Author: clsrich