Ø Method HT: High temperature dyeing method. Dyeing temperature 105-140°C.
Ø Method T: Thermasol dyeing method. Dyeing temperature 180-220°C, continuous method of dyeing.
Ø Pad roll method: Semi continuous dyeing method.
Ø Pad steam method:Continuous dyeing method.
Factors Considered for Selection of a Method
1. Availability of dyeing machine.
2. Required colour effect (dark/medium/light).
3. Required colour fastness.
4. Type of material to be dyed.
5. Cost of dye, chemicals and auxiliaries.
6. Overall economy of the system.
7. Dyeing temperature.
Reduction Cleaning In case of dark shade dyeing, we have to use more amounts of dye and chemicals. But these chemicals should be removed from fabric after dyeing. For this reason, a special process is used in case of disperse dyeing. This cleaning process is called reduction cleaning.
A typical recipe for reduction cleaning is given below:-
1 gm/lit Tingal W
2 gm/lit Hydrosulphite
2-3 ml/lit NaOH (56.5° Tw)
By reduction cleaning, surface dye molecules or unfixed dye molecules are stripped and this in turn results in level dyeing. Reduction cleaning also improves wash fastness property of textile material.
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