yarn faults , causes and its remedies
TRANSCRIPT
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YARN FAULTS AND THEIR CONTROL
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YARN FAULTS , CAUSES AND ITS REMEDIESSLUBS NEPS
SNARL
THICK&THINK PLACES
SOFT YARN
OIL STAINED YARN
CRACKERS
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YARN FAULTS , CAUSES AND ITS REMEDIESBAD PIECING
OILY SLUB
KITTY YARN
HAIRINESS
FOREIGN MATTERS
SPUN IN FLY
CORK SCREW YARN
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SLUBS
An abnormally thick place or lump in yarn showing less twist at that place. EFFECT More end breaks in the next process. Damaged fabric appearance. Shade variation in dyed fabrics.
CAUSES Accumulation of fly and fluff on the machine parts. Poor carding. Defective ring frame drafting and bad piecing Improperly clothed top roller clearers.
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SLUBS
RECTIFICATION
Machine surfaces to be maintained clean. Proper functioning of pnemafil/roller clearers to be ensured. Broken teeth gear wheel to be avoided and proper meshing to be ensured. Better fiber individualisation at cards to be achieved. Optimum top roller pressure &back zone Setting at ring frame to be maintained.
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NEPS
Yarn containing rolled fibre mass, which can be clearly seen on black board at close distance; measurable on Uster imperfection Indicator.
EFFECT Damaged fabric appearance Shade variation in the dyed fabrics An abnormally thick place or lump in yarn showing less twist at that place is called
slubs
CAUSES Accumalation of fly and fluff on the machine parts Poor carding. Defective ring frame drafting and bad piecing Improperly clothed top roller clearers.
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NEPS
RECTIFICATION
Machine surfaces to be maintained clean. Proper functioning of pnemafil/roller clearers to be ensured. Broken teeth gear wheel to be avoided and proper meshing to be ensured. Better fiber individualisation at cards to be achieved.
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SNARL
Yarn with kinks(twisted onto itself) due to insuffcient tension after twisting EFFECT Entanglement with adjacent ends causing a break Damaged fabric appearance Shade variation in dyed fabrics Improper meshing of gear wheels Mixing of cottons varying widely in fiber lengths and use of immature
cottons
CAUSES Higher than normal twist in the yarn Presence of too many long thin places in the yarn
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SNARL
RECTIFICATION
Optimum twist to be used for the type of cotton processedDrafting parameters to minimise thin places in the yarn to be adoptedThe yarn to be conditionedCorrect tension weights and slub catcher settings to be employed at winding
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THICK AND THIN PLACESMeasurable by Uster Imperfection Indicator and observable on
appearance EFFECT
Eccentric top and bottom rollers Insufficient pressure on top rollersWorn and old aprons and improper apron spacing Improper meshing of gear wheelsMixing of cottons varying widely in fiber lengths and use of
immature cottons
CAUSESEccentric top and bottom rollers Insufficient pressure on top rollersWorn and old aprons and improper apron spacing
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THICK AND THIN PLACES
Improper meshing of gear wheelsMixing of cottons varying widely in fibre lengths and use of immature
cottons
RECTIFICATION
Eccentric top and bottom rollers to be avoidedTop arm pressure checking schedules to be Maintained strictlyWide variation in the properties of cottons used in the mixing to be avoidedBetter fiber individualisation at cards to be achieved.Correct spacers to be utilised
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SOFT YARN
Yarn which is weak indicating lesser twist
EFFECT
More end breaks in subsequent processesShade variation in dyed fabrics
CAUSESSlack tapes dirty jockey pulleys Improper bobbin feed on the splsLess twist in the yarnBad clearing at the travellar
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SOFT YARN RECTIFICATION
Vibration of bobbins on the spindles to be avoidedProper yarn clearing to be ensuredPeriodic replacement of worn rings and travellars to be effected
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OIL STAINED YARN
Yarn stained with oil
EFFECT
Damaged fabric appearance Occurrence of black spot in fabric
CAUSES Careless oil in the moving parts,over head pulleys etc Piecings made with oily or dirty fingers Careless material handlings
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OIL STAINED YARN
RECTIFICATION
Appropriate material handling procedures to be followedOilers to trained in proper method of lubricationClean containers to be utilised for material transportation
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CRACKERS
Very small snarl-like places in the yarn which disappear when pulled with enough tension or Yarn with spring -likeshape
EFFECT
More breaks in winding More noticable in polyester and cotton blendedyarns
CAUSES Mixing of cottons of widely differing staple length Closer roller settings Eccentric top and bottom rollers Non optimum temperature and relative humidity in the spiinning shed Over spinning of cottons
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CRACKERS
RECTIFICATION Optimum top roller pressure to be maintainedMixing of cottons varying widely in fibre length to be avoidedUse of optimum roller settingsUse of properly buffed rollers free from eccentricity to be ensured
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BAD PIECINGUnduly thick piecing in yarn caused by over End piecing EFFECT More end breaks in subsequent process Increase in hard waste
CAUSESWrong method of piecing and over end piecingTwisting the ends instead of knotting
RECTIFICATION Tenters to be trained in proper methods of piecingSeparators to be providedExcessive end breaks in spinning to be avoided
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OILY SLUB
Slub in the yarn stained with oil EFFECT More end breaks in the ensuring processDamaged fabric appearanceShade variation in dyed fabrics
CAUSESAccumulation of oily fluff on machinery partsPoor methods of lubrication in preparatory processesNegligence in segregating the oily waste from process waste
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OILY SLUB
RECTIFICATION Yarn contact surfaces to be kept cleanOilers to be trained in correct procedures of lubricationProper segregation of oily waste from process waste
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KITTY YARN EFFECT
Damaged fabric appearanceProduction of specks during dyeingNeedle breaks during knittingPoor performance during winding
CAUSES Ineffective cleaning in Blow room and cardsUse of cottons with high trash and too many seed coat fragments
RECTIFICATION Cleaning efficiency of blow room and cards to be improvedOptimum humidity in the departments to be ensured
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HAIRINESS
Protrusion of fibre ends from the main yarn structure EFFECT More end breaks in windingUneven fabric surfaceBeads formation in the fabric in the case of polyester/cotton blends
CAUSESUse of cottons differing widely in the properties in the same mixingUse of worn rings and lighter travellarsMaintaining low relative humidity, closer roller settings and very high
spindle speeds
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HAIRINESS
RECTIFICATION Use of travellars of correct size and shape and rings in good condition to be
ensuredPeriodic replacement of travellars and suitableRoller settings to be maintainedOptimum relative humidity to be maintained in the spinning roomWide variation in the properties of cottons used in the mixing to be avoided
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FOREIGN MATTERS
Metallic parts, jute flannel and other similar foreign matters spun along with yarn EFFECT Breaks during winding Formation of holes and stains in cloth Damaged fabric appearance
CAUSES Improper handling of travellers Improper preparation of mixings
RECTIFICATION Removal of foreign matters(such as jute fibres,colour cloth bits) to be ensured during preparation
of mixing Installation of permanent magnets at proper Places in blow room lines to be ensured
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SPUN IN FLYFly or fluff either spun along with the yarn or loosely embedded on the
yarn EFFECT More breaks in winding
CAUSESAccumulation of fluff over machine partsFanning by workersFailure of over head cleanersMalfunctioning of humidification plant
RECTIFICATION Machinery surfaces to be kept clean by using roller pickersPerformance of over head cleaners and humidification plants to be closely
monitored
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CORK SCREW YARNIt is a double yarn which one yarn is straight and other is coiled over it
EFFECT Breaks during windingCauses streaks in the fabric
CAUSESFeeding of two ends (instead of one ) in ring frameLashing -in ends in ring frame
RECTIFICATION Tenters are to be trained in piecing methods(or) practicesPneumafil ducts to be kept clean and properly set