How to Dye Acetate/Rayon Blends with Orcocil™ and Orco Reactive R- or BF-Series™ Reactive Dyes using a Two-Bath Dyeing Process
- Care should be exercised when selecting Orcocil™ dyes for certain applications due to the limitations of gas-fade properties of some dyes.
- Do not exceed a pH of 9 in any process involving rayon as it will cause saponification of the fiber.
Dyeing of Rayon
- Circulate prepared goods at 120°F(49°C) in following chemical bath:
- 1 % owg Orconol CHSA Conc™
- Common Salt – refer to chart below
- x % owg Orco Reactive™ Dye properly prepared
- Soda Ash – refer to chart below
Liquor Ratio |
% owg Dye |
|||||
0.0-0.5 | 0.5-1.0 | 1.0-2.0 | 2.0-3.0 | 3.0-4.0 | 4.0-+ | |
8:1 to 12:1 | ||||||
Common Salt (G/L) | 15 | 25 | 40 | 50 | 50 | 50 |
Soda Ash (G/L) | 4 | 5 | 6 | 7 | 9 | 12 |
Less than 8:1 | ||||||
Common Salt (G/L) | 10 | 20 | 30 | 35 | 45 | 45 |
Soda Ash (G/L) | 5 | 6 | 7 | 9 | 11 | 13 |
- Raise temperature slowly to 140°F(60°C) and hold.
- At 140°F(60°C) add Soda Ash. This should be added pre-diluted and in thirds over a 20-minute period to ensure levelness. Dyeing time can range from 45-90 minutes depending on depth of shade.
- Cool back/overflow to 110°F(43°C)
- Rinse in 0.13 oz/gal(1.0 g/L) of Acetic acid 56% for 15 minutes.
- Cool back to 90°F(32°C), drop bath, and refill.
- Raise temperature to 210°F(99°C) and soap off for 15 minutes with 0.25 % owg Orcopon KP™.
- Drop bath, refill and hot rinse for 10 minutes.
- Drop bath, refill and cold rinse for 10 minutes.
- Refill for subsequent dyeing of acetate with disperse dyes.
Dyeing of Acetate
- Circulate goods at 110-120°F(43-49°C) for 10-15 minutes in a bath containing 50-1.0% owg Anionic Wetting Agent
Adjust pH if necessary to 5.5-6.0. - Add Orcocil™ dyes properly prepared.
- Hold at this temperature for 50-60 minutes.
- Cool back to 140°F(60°C), drop bath, and rinse.