Faults in the Knitted Fabrics (part 5)

NeedleLines
Definition:
Needle lines are prominent vertical lines along the length of the fabric which are easily visible in the grey as well as finished fabric. 

 Causes:

• Bent Latches, Needle Hooks & Needle stems
• Wrong Needle selection (Wrong sequence of needles, put in the Cylinder or Dial 
• Remedies:

• Inspect the grey fabric on the knitting machine for any Needle lines.
• Check the Needle filling sequence in the Cylinder / Dial grooves (tricks).

Horizontallines
Causes:

• Fault in bobbin
• Irregular tension on cams. 
• Remedies:

• Replace that bobbin.
• Check cams positioning

BrokenNeedles/ Laddering
Definition:
Defects caused by the broken needles show prominently as vertical lines parallel to the Wales. There are no loops formed in the Wale which has a broken needle.

• High Yarn Tension
• Bad Setting of the Yarn Feeders
• Old & Worn out Needle set
• Cylinder Grooves are too tight restricting needle movement
• Breakage of hook or butt in needle.

Remedies:

• Ensure uniform & the right Yarn tension on all the feeders.
• Keep the recommended gap between the Yarn Feeders & the Needles.
• Periodically change the complete set of needles.
• Remove fly or blockage from groove.
• Replace defective needle.

SinkerLines
Definitions:
Sinker lines are prominent or feeble vertical lines appearing parallel to the Wales along the length of the knitted fabric tube. 

 Causes:

• Bent or Worn out Sinkers
• Sinkers being tight in the Sinker Ring grooves

Remedies:

• Replace all the worn out or bent sinkers causing Sinker lines in the fabric.
• Sinker lines are very fine & feeble vertical lines appearing in the fabric.
• Remove the fibers clogging the Sinker tricks (Groove

OilLines
Definitions:
Oil lines are prominent vertical lines which appear along the length of the knitted fabric tube. The lines become permanent if the needle oil used is not washable & gets baked due to the heat during the finishing of the fabric. 

 Causes:

• Fibers & fluff accumulated in the needle tricks which remain soaked with oil.
• Excessive oiling of the needle beds.

Remedies:

• Fibers accumulated in the needle tricks cause the oil to seep into the Fabric.
• Some lubricating oils are not washable & can not be removed during Scouring.
• Remove all the Needles & the Sinkers of the machine periodically.
• Clean the grooves of the Cylinder & Dial of the machine thoroughly with petrol.
• Blow the grooves of the Cylinder Dial & Sinker ring with dry air after cleaning.

BrokenEnds
Definition:
Broken ends appear as equidistant prominent horizontal lines along the width of the fabric tube when a yarn breaks or is exhausted.

Causes:

• High Yarn Tension
• Yarn exhausted on the Cones.

Remedies:

• Ensure correct yarn tension on all the feeders.
• Ensure that the Yarn detectors on all the feeders are working properly.
• Depute a skilled & alert machine operator on the knitting machine.