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Water
Marks found in 100% Cotton:
Suggestion for removing the water
mark before processing:
In
grey unprocessed stage if cotton fabric is exposed to water spotting when it is
in pile form and if it is not noticed before taking for processing, a big head
ache will land up with the processing people. Fabric taken for desize, mercerise,
bleach and dye would show irregular shaped patches in the processed fabric.
This
is may be due to either fungus formation on the wet areas or partial removal of
size due to bacterial action under moist conditions. Whatever it may be, these
patches would appear prominent only after dyeing or bleaching (OBA treated).
Mostly
these patches your would come across during rainy season or while processing a
fabric that was stored for very long time. If you are lucky enough to take
processing in batch mode, you can very well eliminate the patches fro the next
batch on wards.
Instead of
going for peroxide bleach or mercerisation after desizing, you take the fabric
directly for hypo bleaching. No extra alkali should be present during this
process, except a wetting agent and sodium hypochlorite. After this process, you
can take any route according to your necessity. Now you would not find any water
mark in the processed fabric.
Always
prevention is better than cure. So when storing the fabric is a ware
house, always keep it closed with a polythene sheet to avoid these type of
mystic problems, that you can notice only after damaging sufficient
quantity of fabric.
Suggestion
for removing the water mark before processing:
(1)
If the fabric is in mercerised stage, try a hypo bleach, followed by peroxide
bleaching.
(2) If the
fabric is in dyed stage, you have to convert the dyed shade either in to a jet
black (sulphur black) or some very dark shade and go for fresh lot.
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