Table 2 Wet-blue fatliquoring process.
Process | Amount [%] | Agent | Temperature [°C] | Time [min] | pH | Comments |
|---|---|---|---|---|---|---|
Wetting back | 200 | Water | 45 | |||
0.50 | Formic acid | 30 | 3.5 | |||
0.30 | Wetting agent | Drain | ||||
Washing | 300 | Water | 45 | 15 | Drain | |
Retanage | 100 | Water | 40 | 240 | ||
5 | Chromium salt | 4.0–4.2 | Leave overnight, next morning run for 30 min, drain | |||
Neutralization | 200 | Water | 35 | |||
2 | Sodium formate | 30 | ||||
1.0–1.5 | Sodium bicarbonate | 2 × 15 + 60 | 5.5–5.8 | Drain | ||
Washing | 200 | Water | 35 | 15 | Drain | |
Fatliquoring | 150 | Water | 55 | |||
15 | Fatliquoring agenta | 90 | ||||
2 | Formic acid | 3 × 20 + 30 | 3.8–4.0 | Rinse, horse up |
