Faults of Knitted Fabric in Production

Loop formation produces knitted fabric which should be careful. Various types of faults can be found in knitted fabric, which caused by fabric rejection. Find out defects of fabric during production. Then, steps can be taken to remove them from the next knitting production process.

In practical: The followings are the faults which could be found on the knitted fabric.

Hole Mark
Reasons:
>The yarn breaks in the rejoin of the needle hook during loop formation.
>Caused by yarn breakage or cracks.
>The yarn is not correct on regarding structure, gauge, course and density.
>Badly knots or splicing.
>Badly set of yarn feeder.

Needle Mark
Reasons:
>Needle marks come along the fabrics when a needle breaks down.
>If a needle or needle hook is slightly bends, then needle mark comes on the fabrics.

Star
Reasons:
>Buckling of the needle latch.
>Yarn tension variation during production.
>Low G.S.M fabric production.

Sinker Mark
Reasons:
>Sinker may corrode for abrasion. So it cannot a new loop and result in sinker mark coming.
>Sinker head bends. Then sinker mark comes.

Drop Stitches
Reasons:
>Yarn is not feed properly during loop formation.
>Using defective needle.
>Take down mechanism is too loose.
>Insufficient yarn.
>Set yarn feeder badly.

Oil Stain
Cause:
>When oil lick through the needle trick then it pass on the fabrics and make a line.

Rush Stain
Reasons:
>Rush in the machine.

Pin Hole
Reasons:
>Break down or bend of the larch causes pin hole on the fabric.

Grease Stain
Reasons:
>Improper greasing in the machine.
>Excess IF greasing

Reasons:
> when an empty needle with an empty needle with close latch runs into the yarn feeder and remove the yarn out of the hook of the following needles, then cloth fall out occur after a drop stitch.

Barre
Reasons:
>Yarn fault
>Different micro near value of fiber content in yarn.
>Different luster and dye affinity of fiber content in yarn.
>During spinning different similar classes of fiber is mixed specially in carded yarn and these fibers have similar characteristics.
>In draw frame different similar classes sliver is mixed and make one sliver.

Yarn Contamination
Reasons:
>Yarn contains foreign fiber. And the foreign are remained in the fabric even after finishing.
>Lot mixing and count mixing.

Fly Dust
Cause:
>In knitting section too much lint or short fiber is flying to and fro that are created from yarn due to low twist as well as yarn friction. This lint may adhere or attached to the fabric surface tightly during knit fabric manufacturing.

Yarn Faults
Reasons:
>Different yarn faults
>Neps
>Slubs
>Yarn count variation
>Thick/Thin place in yarn
>Hairiness

Knitted machine should have perfect conditions. Faults are not allowed to exist in needle, sinker, feeder and other equipments.