Following factors should be considered before viscose dyeing
In poor-quality viscose, carbon disulphide (used
to form cellulose xanthate) remain in the fibre and may create strong yellowing
during pre-setting and unlevel-dyeing problems while reactive dyeing. So bleach
the fabric with soda ash and hydrogen peroxide to eliminate carbon disulphide.
If possible use hot brand dyestuff. If hot brand
dyestuff is not available, dose colour at 45 degree Celsius to reduce affinity
of dyestuff.
Use migration method of dyeing.
Use a 1 degree cel per minute gradient for temp
increment when temp rise 45 degree to 90 degree.
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