Denim fabric is a fabric that is woven with warp yarns dyed and sizing with indigo dye.During the manufacturing process of denim fabric,defects may occur in any process.
Denim fabric defects can be classified as:
Yarn defects(both warp and weft)
Weaving defects and Dyeing and finishing defects
A.Yarn defects:
Yarn defects are warp slub,weft slub,foreign fiber,coarse pick,yarn fly and yarn irregularity.
B.Weaving defects:
Weaving defects are knots,weaving fly, loom stop,stack end,snarl,broken pick,miss pick,tangle,double warp,hole,sizing defect,oil spots,drawing defect and broken warp yarns.
C.Dyeing and finishing defects:
Dyeing and finishing defects are more complex damages than physical damages.Problems
often seen are poor fastness,uneven and poor wash down,abrasion or scrub marks in pre washed denim fabrics,uneven shrinkage,stiff hand after dyeing,dye streaks,side to center shading caused by the loom,poor stabilisation and corrugationin sanforization.It is easy to confuse many causes of unevenness of color in indigo denim fabrics.It can be created in preparation of the yarn,including inadequate and uneven boil off,bunching of the yarn during dyeing,uneven squeezing in the dyeing and uneven wash off.It may also be due to poor sizing,poor weaving,loom settings or uneven tensions.
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