International Journal of Interdisciplinary Research
Table 3 The factors and levels of the central composite experiment design
Factor | Unit | Code | Coding level | ||||
|---|---|---|---|---|---|---|---|
− 2 | − 1 | 0 | 1 | 2 | |||
Dye dosage | % (owf) | A | 3 | 4 | 5 | 6 | 7 |
Dyeing temperature | °C | B | 40 | 50 | 60 | 70 | 80 |
Sodium sulfate dosage | g/L | C | 70 | 80 | 90 | 100 | 110 |
Sodium carbonate dosage | g/L | D | 5 | 10 | 15 | 20 | 25 |