L9 orthogonal experimental scheme.
| Symbol | Process parameters | Unit | Level 1 | Level 2 | Level 3 |
|---|---|---|---|---|---|
| A | CFA mass | %, o.m.f | 3 | 4 | 5 |
| B | Water mass | %, o.m.f | 100 | 150 | 200 |
| C | Fixing time | min | 30 | 40 | 50 |
| D | Fixing temperature | °C | 80 | 90 | 100 |
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