Dying Method: Explained in brief
by : Rahul Sharma
Dying Method:
The color is pasted well and dissolved in boiling water to get a lump free solution. An addition of 0.5-2 g I-1 sodium carbonate may be advantageous when applying dyes of only moderate solubility in full depths.
- The dyebath is set at 40C,
- Raise to the boil at 2 degC min-1
- Hold at the boil for 30-45 min,
- During hold add 10-15 g I-1 of sodium chloride or calcined Glauber's salt. Light shades are dyed without or lesser addition of salt.
- Improved yeilds can be achived when applying full depths by cooling to 80C at the end of the period aty the boil, adding a further 5 g I-1 salt and rising to the boil again
- Dye bath variables which must be considered for level dyeing.
1.Temperature of Dyeing and rate of heating
2.Electrolyte concentration and addition
3.Time
4.Dye solubility
5.Use of leveling agent
