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Appearance of mildew or fungus on
moist natural fabrics or yarn is a common defect that may be noticed before
processing if the mildew degradation of fabric is prominent. In the beginning
stage the mildew appears as pale yellow spots and slowly this yellow spots
mature in to page green, then blue or violet and finally in to dark black spots.
Mildew
can be effectively removed by dilute hypochlorite treatment on the affected
area.
If the fabric is a dyed
one, spot the fabric on the unaffected area with dilute hypochlorite solution.
Check for change or destruction of shade. If it does not happen, you can treat
the fabric on any batch processing machine with dilute 1 to 2 gram per liter of
Sodium Hypochlorite.
On the
other hand, if the fabric is a greige or white, you can go for a hypochlorite
bleach followed by a peroxide bleach.
To
avoid mildew formation during storage of wet fabric ( while in processing), at
no stage keep it wet under mild acid conditions. The acidic pH and wet
condition, favor the bacterial action. Keep all wet fabric under perfect neutral
or slightly alkaline pH and avoid bacterial action.
For
further reading on this topic:
Antimicrobial
Finish
http://fungus.org.uk/nwfg/rot.htm
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