Textile Knowledge : Color performance of Azoic dyeing

1 ) Characteristics of Naphthol:

i. Absorption and penetration of Naphthol

ii. Concentration of Naphthol solution

iii. Strength of naphthol solution

iv. Inherent substantivity of naphthol

2 ) Characteristics of base:

i. Strength of base solution

ii. Temperature of base (8-12°C)

iii. P^H of base

3 ) Salt addition:

It is used to increase subantivity of naphthol to fibre and mainly to prevent the migration of naphthol into dye bath.

4 ) Produced hue:

i. Red color – Produce quickly

ii. Blue color – Produce slowly

iii. Yellow color – Produce quickly

5 ) P^H :

Recommended range 5-6 . If p^H increases the rate of production decreases.

6 ) Rate of Couple:

i. Fast at higher p^H

ii. Slowat lower p^H

iii. Normal at p^H=5-6

7 ) Time: Recommended time 20-30 minutes.

Textile Knowledge