After-Scouring(After-Clearing) of polyester after the dyeing process is necessary to remove any residual surface dye and dye carrier. A good hot overflow rinse at 180°F(83°C) will remove the majority of the carrier. For package dyeing, proceed directly to the scour procedure at 160°F(71°C). After this hot rinse and after-scour as described below, the remainder of carrier, if present, can typically be sublimed off during post heat-setting.
- After a good rinse as described above, enter the dyed, rinsed goods into a bath containing:
- 0.5 % owg Orconol CHSA Conc™
- 4.0 % owg Suitable Reducing Agent such as Sodium Hydrosulphite
- Raise temperature to 160°F(72°C) and run for 20 minutes.
- Cool back to 120°F(49°C) and rinse well.