During the production of knitted denim yarn, rungs, wrinkling and rough hand feel are very common problems. When knitted denim yarn presents these problems, it needs to be re-produced, which wastes time and has a great impact on the production efficiency of knitted denim yarn.

1. Cross bar: knitted denim yarn presents stripes or banded stripes, which is because the yarn size in one area of knitted denim yarn is different.

2. Rough and hard feel: too tight coil structure or too thick yarn will make the handle of knitted denim yarn very rough or stiff.

3. Twig inclination: if the take-up equipment of the knitting machine fails, there will be stripes or zigzag lines within the width of the knitted denim yarn.

4. Wrinkle: knitted denim yarn is wrinkled and cannot be expanded mostly because of uneven coil or yarn size.

5. Needle leakage: the coil is not woven because the coil is too loose or the yarn guide device is incorrect.

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