Indigo Dyeing on a 20 rope range

The softner used is cationic in nature and works best in acidic conditions.

Rope Dyeing Vs. Sheet Dyeing

In rope Dyeing

Ball warp--> wash-Dye-Coil-->Beam-->Size-->Weave

In Sheet Dyeing

warp-->wash-dye-size-beam-->weave

Modification on plain loom for Denim

The following is the proposed modification on plain loom for weaving denim. The main problem of running denim on plain loom is the presence of width wide faults, problems of a strong beatup and prevention of starting marks among others.

How to make Indigo solution

In a tank of 1000 liters:
a. take 400 litres of water (soft)
b. add setamol ws--> 4 g/l (stirring) ( dispersing solution)
c. Add 100 kg of Indigo ( at 1.8 % shade -see the indigo calculations- stirring)
d. add caustic soda --> stirring ( for solubilising and pH)
e. allow to cool it for 2/3 hours
f. Add hydrosulphide ( As reducing agent)
g. Make the solution to 1000 l by adding water.

If pH is fluctuating, if it is > 11.7 then hydro is added (2-3 kg), if (<11.2) then caustic is added.

For 100 kg of Indigo,
Caustic Required= 90 kg
Hydro Required= 80 kg