Hot Reactive Dyeing on Cellulose

In fact vinylsulphone dyestuffs are generally classified in to hot dyeing dyestuffs. These dyestuffs have their own exhaustion  and fixation temperatures. These dyestuffs that have already poor exhaustion properties would give better results in hot dyeing rather than cold.

Method of dyeing:

1. Make ready the dye bath with sharpening chemicals and auxiliaries.
2. Add the dyestuff in to the bath slowly over a period of time ( may 20 minutes).
3. Raise the temperature to 60°C.
4. After addition of dyestuff, add the required amount of salt in two portions or slowly ( 20 minutes).
5. The add Soda ash to the dye bath in 2 portions or over a period of 20 minutes.
6. Continue dyeing for 40 minutes.
7. Take sample. If the shade is slightly lighter (10% ~15%).
8. Continue dyeing for 30 minutes, and check the shade. Even then if it is not matching to the standard, very small additions you can make. If the requirement of additional dyestuff is great then drain the bath. Make 2 hot washes followed 2 cold wash and neutralization. take out the batch from the machine. Take a sample from the batch and try over dyeing in the lab to find out the exact additional quantity of dyestuff. Set fresh water bath and do the procedures from 1 to 7.

Salt and Soda requirement:

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