Constituent chemicals
|
Concentration (g/l)
|
Function
|
Indigo
|
16
|
Dye
|
Delinol VB/LU
|
1
|
Dispersing agent
|
Prisulon 1550S
|
100
|
Coagulating thickener
|
A 10 cm x 25 cm cotton fabric sample, free of creases, was clamped onto the K-Bar hand coater. About 1 ml of print paste was placed at one end of the fabric and drawn down using a number 2 (two) K-Bar simulating a 48T screen mesh. As explained earlier, the K-Bar system standardised printing process variables. The printed sample was dried at 65○C for 15 minutes. The dried sample was developed by padding with a reducing bath followed by steaming according to the procedures described in Section 6.4.1.
The padding/printing process and the subsequent developing steps are schematically shown in Figure 6.3. These processes were carried out for both natural and synthetic indigo.
Dry
Figure 6.3 Schematic process sequence diagram
Evaluation
After conditioning for 24 hours under standard conditions of 65 ± 2% RH and 20 ± 2°C, the colour and fastness properties of the dyed/printed samples were measured according to the procedures set forth in Section 2.2.3. The equivalence of shade obtained between exhaust dyeing and padding was established. Comparison was made between shades obtained on the basis of the alkali used, the source of indigo and steaming duration.
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