Since the development of commercial Synthetic Vat dyestuff in 1901, this class of dyestuffs has undergone various physico-chemical modifications and still remain first choice of dyers whenever highest degree of fastness standards are desired. Especially in high quality shirting with multi-coloured yarns for designs in stripes/ checks, formal and industrial work wear, uniforms, home upholstery, medical clothes, etc. only Vat dyes can withstand stringent fastness requirements.
Though, generally as a class of dyestuffs it lacks brilliancy of shades, involves complex dyeing process & overall high recipe cost when compared to the subsequently developed other class of dyestuffs for Cellulosic dyeing like Reactives, Azoics, Sulphur, etc. it is still preferred and used world over for the outstanding fastness properties especially, the wet light fastness, ability to withstand repetitive laundry washes, post mercerization/ alkali fastness & Chlorine/ oxidative bleach fastness.
Traditionally Vat dyes are preferred for use in conventional/simple low turbulence application methods on woven cotton processing in Jiggers or Cotton hank dyeing in Tubs/Vats. The textile dyer/processor is generally reluctant to use these dyes on high turbulence, low liquor ratio package dyeing machines for the fear of getting non uniform, unlevel shades.
As a world renowned Vat dyestuff manufacturer and supplier, Atul Ltd has developed a unique dye manufacturing processes and developed application methods to meet the dyers requirements in terms of eco friendly, non polluting, easy to use Vat dyes in super fine dispersion form.
The state of the art reactors and dye manufacturing routes ensures process modifications during development of these Vat Dyes. Given below are some of the Eco -initiatives taken and process modifications made to overcome the inherent problems of accumulation of the heavy metal ions and toxic intermediate compound formation associated with most of these dyes. Further, ATUL has successfully achieved reduction in the Effluent load by modifying the Dyestuff manufacturing processes and controlling the reaction rates so as to significantly reduce release of ecologically harmful heavy metal ion compounds from the effluent stream.
Some of the manufacturing process route modifications are as given below: