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Faults in Knit Dyed Fabric

Faults in knit dyed fabric

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Page 1: Faults in knit dyed fabric

Faults in Knit Dyed Fabric

Page 2: Faults in knit dyed fabric

Name : MAZADUL HASAN SHESHIRID: 2010000400008Batch: 13th Batch (Session 2009-2013)Department: Wet Processing Technology Email: [email protected]: www. Textilelab.blogspot.com Southeast UniversityDepartment of Textile Engineering

PREPARED BY ©right

Page 3: Faults in knit dyed fabric

Knitting faults

Page 4: Faults in knit dyed fabric

Yarn dust

Causes of faults: - Fly yarn/ foreign fiber

Remedies: - Proper air suction

Page 5: Faults in knit dyed fabric

Set-up

Causes of faults: - For badly needle break Yarn break

Remedies: - Remove bad needle Maintain proper tension

Page 6: Faults in knit dyed fabric

Loop mark

Causes of faults: - Defective needle Not properly needle

latch work

Remedies: - Change new needle By clean needle latch,

hook

Page 7: Faults in knit dyed fabric

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

Page 8: Faults in knit dyed fabric

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

Page 9: Faults in knit dyed fabric

Thick place

Causes of faults: - Different yarn count Use unmatured fiber

Remedies: - Select matured fiber Check /indentify the

yarn thick/thin place

Page 10: Faults in knit dyed fabric

Mix yarn/Lot mix

Causes of faults: - Unawareness of

operator

Remedies: - Awareness in

production

Page 11: Faults in knit dyed fabric

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

Page 12: Faults in knit dyed fabric

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

Page 13: Faults in knit dyed fabric

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

Page 14: Faults in knit dyed fabric

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

Page 15: Faults in knit dyed fabric

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

Page 16: Faults in knit dyed fabric

Dyeing faults

Page 17: Faults in knit dyed fabric

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

Page 18: Faults in knit dyed fabric

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

Page 19: Faults in knit dyed fabric

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

Page 20: Faults in knit dyed fabric

Dye spots

Causes of faults: - Colored spots due to

dye deposits on the m/c

Remedies: - Pay attention to

cleanness in the m/c

Page 21: Faults in knit dyed fabric

Pilling

Causes of faults: - Due to friction of fabric Poor yarn quality

Remedies: - Need good enzyme

treatment By using combed yarn

Page 22: Faults in knit dyed fabric

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

Page 23: Faults in knit dyed fabric

Soda spot

Causes of faults: - Improper dosing of soda

Remedies: - Proper dosing of soda

Page 24: Faults in knit dyed fabric

Finishing fault of knit dyeing fabric

Page 25: Faults in knit dyed fabric

Uneven

Causes of faults: - Unstable dye dispersion Dispersing agent not

enough Wrong temperature

Remedies: - Select dyes with better

dispersion stability Proper temperature

maintained

Page 26: Faults in knit dyed fabric

Skew

Causes of faults: - Over width for this

fabric

Remedies: - By using weft

straightening device Maintain proper width

Page 27: Faults in knit dyed fabric

Slitting fault

Causes of faults: - It is causes due to

operator carelessness

Remedies: - Operators have to slit

fabric through slitting mark

Page 28: Faults in knit dyed fabric

Uneven brushing

Causes of faults: - Not proper soft Roller pins problem

Remedies: - Use softener Check pins

Page 29: Faults in knit dyed fabric

Crease mark

Causes of faults: - Improper motion of

padder Improper fabric

movement

Remedies: - Proper motion of padder Ensure smooth running

of fabric Use anti-creasing agents

Page 30: Faults in knit dyed fabric

Unwanted mark

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 oil which

can be removed Proper handling should

be taken

Page 31: Faults in knit dyed fabric

Oil mark

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 oil which

can be removed After every process, if

possible check filter and clean it

Page 32: Faults in knit dyed fabric

Silicon spot

Causes of faults: - Long time deposit of

solution Improper mixing of the

silicon

Remedies: - Proper mixing of the

silicon Use the right silicon Maintain the correct pH

value, before application

Page 33: Faults in knit dyed fabric

Silicon mark & Burn effect

Causes of faults: - Long time deposit of solution Improper mixing For over or high temperature

this burn effect is visible Twice stenter

Remedies: - Proper mixing Select suitable silicon Maintain correct temperature

Page 34: Faults in knit dyed fabric

Line mark

Causes of faults: - This mark are caused

due to the excessive pressure of the roller

Remedies: - Pressure of roller should

be maintained Take care of fabric

Page 35: Faults in knit dyed fabric

Burning effect

Causes of faults: - For wrong temperature Unawareness of

operator

Remedies: - Maintained proper

temperature By using experienced

manpower

Page 36: Faults in knit dyed fabric

Chemical spot

Causes of faults: - Improper mixing of

chemical Weak chemical Unawareness of operator

Remedies: - Proper mixing of chemical Use appropriate chemical By using experienced

manpower

Page 37: Faults in knit dyed fabric

Uneven brushing

Causes of faults: - Too much pressure of

the cylinder roller is the causes

Remedies: - Operator should take

care when fabric is running

Uniform motion R.P.M should maintained

Page 38: Faults in knit dyed fabric

Uneven brushing

Causes of faults: - Too much pressure of

the cylinder roller is the causes

Remedies: - Operator should take

care when fabric is running

Uniform motion R.P.M should maintained

Page 39: Faults in knit dyed fabric

Sewding fault

Causes of faults: - Wrong m/c set up Over speed /r.p.m Displace of pin

Remedies: - Installed proper m/c set

up Maintain correct

cylinder speed Check and proper

placement of pin

Page 40: Faults in knit dyed fabric

Unwanted mark

Causes of faults: - Due to contact with iron

rust from m/c parts If fabric wet long time Unclean roller or padder

Remedies: - Try to clean m/c parts Keep fabric dry Clean roller and padder

Page 41: Faults in knit dyed fabric