Abstract:
This study has been sorted on effect of denim yarn dyeing with vat dye in different ratio of Hydrose
and Caustic Soda. In this thesis experiment we use two types of yarn Cotton yarn and Tencel yarn.
Cotton is the most common plant fiber, which is typically spun into fine yarn for mechanical
weaving or knitting in cloth. Typical Denim fabrics are woven from coarse, indigo-dyed Cotton
yarn. And Tencel yarn is like other natural fibers. It’s a cellulose –based fiber and can be used
similarly to silk or mercerized cotton. It has smooth texture, soft and silky appearance.
Sodium Hydrosulphite named Hydrose in commercially is used as reducer for vat dye. Hydrose
help to produce the insoluble dye to soluble dye by reduction process. Caustic Soda is used in
textile dyeing as most dyeing processes require a control pH level in dye bath. Caustic Soda helps
to maintain higher pH of 10.5-11.5 obtain ionized from of the dye. In Denim dyeing process the
main dye is Indigo which also called Vat dye. Denim is a yarn dyeing process, warp yarn is mainly
need to dye. In bulk production for accelerate this process a standard ratio of reducing agent and
Caustic Soda is maintained for getting required output.
This research focuses on the shade variation of Cotton and Tencel dyed yarn with indigo dye in
different ratio of Hydrose and Caustic soda and also evaluate the different properties of Cotton and
Tencel yarn. Because dyeing auxiliaries make effect on material. Six bath was used for each
process to achieve optimum output. After this process statistically analyze the result of all output.
We are using blue (Indigo) in powder form.
