Dyeing Method
A. 3% Dyeing Method for Grain Leather ( % are based on shaved wet blue weight )
| Process | Products | % | ℃ | Time(min) | Remark |
|---|---|---|---|---|---|
| Wasing | Water | 200 | 35 | ||
| Formic Acid | 0.2 | ||||
| Degrerasing Agent | 0.2 | 30 | |||
| Rinse | |||||
| Rechroming | Water | 150 | 35 | ||
| Chrome Syntan | 2.0 | ||||
| Natural Synthetic Fat | 1.0 | 60 | |||
| Drain | |||||
| Neutrailzation | Water | 150 | 35 | ||
| Neutrailzing Syntan | 2.0 | ||||
| Sodium Formate | 2.0 | 20 | |||
| Sodium Bicarbonate | 1.0 | 40 | pH:4.8 | ||
| Rinse | |||||
| Retanning & Dyeing | Water | 50 | 35 | ||
| Acrylic Polymer | 2.0 | ||||
| Melamine Syntan | 3.0 | ||||
| Resin Syntan | 3.0 | ||||
| Phenol Syntan | 1.0 | ||||
| Leveling Agent | 1.0 | ||||
| Dyestuffs | 1.0 | 50 | Check Penetration | ||
| Water | 150 | 60 | |||
| Formic Acid | 1.5 | 20 | pH:3.8 | ||
| Rinse | |||||
| Fatliquoring Agents | Water | 200 | 60 | ||
| Fatliquoring Agents | 8.0 | 50 | |||
| Formic Acid | 1.0 | 20 | |||
| Rinse |