During inspection of gray fabrics produced by different knitting machines are checked by inspection machine. The fabrics faults are identified. There are many types of faults like-
- Hole mark
- Needle mark.
- Sinker mark
- Star mark
- Drop stitches
- Oil mark
- Pin hole
- Grease mark
- Flying dust
- Yarn Contamination.
- Set up
- Lycra Out.
- Double yarn.
- Yarn problem.
1. Hole Mark
- Holes are the results of yarn breakage or yarn cracks.
- During loop formation the yarn breaks in the rejoin of the needle hook.
- If the yarn count is not correct on regarding structure, gauge, course and density.
- Badly knot or splicing.
- Yarn feeder badly set.
- Yarn strength must be sufficient to withstand the stretch as well as uniform.
- Use proper count of yarn.
- Correctly set of yarn feeder.
- Knot should be given properly.
2. Needle Mark
- When a needle breaks down then needle mark comes along the fabrics.
- If a needle or needle hook is slightly bends then needle mark comes on the fabrics.
- Needle should be straight as well as from broken latch.
3. Sinker Mark
- When sinker corrode due to abrasion then some times can not hold a new loop as a result sinker mark comes.
- If sinker head bend then sinker mark comes.
- Sinker should be changed.
4. Star Mark
- Yarn tension variation during production.
- Buckling of the needle latch.
- Low G.S.M fabric production.
- Maintain same Yarn tension during production.
- Use good conditioned needles.
5. Drop Stitches
- Defective needle.
- If yarn is not properly fed during loop formation i.e. not properly laid on to the needle hook.
- Take-down mechanism too loose.
- Insufficient yarn tension.
- Badly set yarn feeder.
- Needle should be straight & well.
- Proper feeding of yarn during loop formation.
- Correct take up of the fabric & correct fabric tension.
- Yarn tension should be properly
6. Oil mark
- When oil lick through the needle trick then it pass on the fabrics and make a line.
- Ensure that oil does not pass on the fabrics.
- Well maintenance as well as proper oiling.
7. Pin hole
- Due to break down or bend of the latch, pin hole may come in the fabric.
- Change the needle.
8. Grease mark
- Improper greasing
- Excess greasing
- Proper greasing as well as proper maintenance
9. Fly dust:
- In knitting section too much lint is flying to and fro that are created from yarn due to low twist as well as yarn friction. This lint may adhere or attaches to the fabric surface tightly during knit fabric production.
- Blowing air for cleaning and different parts after a certain period of time.
- By cleaning the floor continuously.
- By using ducting system for cleaning too much lint in the floor.
- Over all ensure that lint does not attach to the fabric.
This inspection is pointed by 4 point system.
4- Point System
< 20 =A great fabric
20-30= B great fabric
30< = unacceptable fabric
Total fault x 36 x 100
Total Point = --------------------------------------------
Roll Length (yds) x Actual Width
Other Knitting Faults With Figure:
The results presented in the present work constitute a technical data base that could be useful for knitters to identify fabric faults linked to fine gauge fabrics produced with CKM. This data base helps also to determine possible faults origins and proposes specific solutions for theses faults causes. The calculation of fault index based on fault size, frequency and gravity permitted to classify more objectively knitted fabric. The Pareto diagram analysis is a practical tool that permitted to determine most important faults origins that have to be corrected in priority to improve fabric quality.