Faults in knit dyed fabric

Faults in Knit Dyed Fabric
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Knitting faults
Yarn dust
Causes of faults: -

Fly yarn/ foreign fiber
Remedies: -

Proper air suction
Set-up
Causes of faults: -

For badly needle break

Yarn break
Remedies: -

Remove bad needle

Maintain proper tension
Loop mark

Causes of faults: -

Defective needle

Not properly needle latch work
Remedies: -

Change new needle

By clean needle latch, hook
Needle break
Causes of faults: -

High yarn tension

Bad setting of the yarn feeders

Old and worn out needle set
Remedies: -

Ensure uniform and right yarn
tension on the feeders

Keep the recommended gap
between the yarn feeders and
the needles

Periodically change complete
set of needles
Oil spot

Causes of faults: -

Due to contact with oil or grease covered exposed
m/c parts

Careless handling could be another cause
Remedies: -

Use of strong knitting oil which can be removed

After every process, if possible check filter and
clean it
Thick place
Causes of faults: -

Different yarn count

Use unmatured fiber
Remedies: -

Select matured fiber

Check /indentify the yarn thick/thin place
Mix yarn/Lot mix
Causes of faults: -

Unawareness of operator
Remedies: -

Awareness in production

Hole
Causes of faults: -

Holes are the results of yarn breakage

Yarn tension too high

Presence of knots in yarn

If the yarn count is not correct
Remedies: -

Yarn strength must be sufficient

Maintain proper tension

Knots should be given properly

Use proper count of yarn
Lycra out
Causes of faults: -

Yarn tension too high

Lycra guide roller block or jam

Needle not properly work
Remedies: -

Maintain proper yarn tension


Ensure smooth running of guide roller

Change defective needle
Yarn contamination
Causes of faults: -

Presence of dead fibers and other foreign
materials

Presence of the foreign materials, in the stable
fiber mixing
Remedies: -

Use rich fiber mixing for the yarns

Segregate the knitting m/c with mosquito nets
to prevent the fibers flying from neighboring
Miss yarn
Causes of faults: -

Yarn break

Positive feeder jam

Excessive needle tension

Weak yarn
Remedies: -


Yarn strength must be sufficient

Smooth running of feeder

Proper needle tension
Tara fault (Star)
Causes of faults: -

For high r.p.m of m/c cylinder

One part dyeing
Remedies: -

Maintain proper r.p.m of m/c cylinder

Range should be upto 23
Dyeing faults
Uneven dyeing
Causes of faults: -

Inadequate scouring of the grey fabric

Correct pH value not maintained

Water hardness

Improper neutralization

Improper migration
Remedies: -


Scour the grey fabric thoroughly, to
remove all the impurities from the
fabric

Maintain the correct pH value

Maintain water hardness

Proper neutralization

Proper migration
Uneven dyeing
Causes of faults: -

Improper neutralization

Improper dyes dosing

Improper soda dosing

Improper migration

Improper leveling agents
Remedies: -

Proper neutralization

Proper dyes dosing


Proper soda dosing

Proper migration

Proper leveling agents
Uneven dyeing
Causes of faults: -

Dyeing m/c stoppage, due to power
failure or the fabric entanglement in
the dyeing m/c

Correct pH value not maintained

Improper leveling agent

Water hardness
Remedies: -

Use a power back up for the dyeing
operation to be completed
uninterrupted

Maintain correct pH value

Use appropriate leveling agents

Maintain water hardness
Dye spots
Causes of faults: -


Colored spots due to dye deposits on the m/c
Remedies: -

Pay attention to cleanness in the m/c
Pilling
Causes of faults: -

Due to friction of fabric

Poor yarn quality
Remedies: -

Need good enzyme treatment

By using combed yarn
Uneven dyeing
Causes of faults: -

Improper migration

Improper neutralization

Inadequate scouring of the grey fabric
Remedies: -

Scouring the grey fabric thoroughly

Proper migration


Proper neutralization
Soda spot
Causes of faults: -

Improper dosing of soda
Remedies: -

Proper dosing of soda
Finishing fault of knit dyeing fabric
Uneven
Causes of faults: -

Unstable dye dispersion

Dispersing agent not enough

Wrong temperature
Remedies: -

Select dyes with better dispersion stability

Proper temperature maintained