Table 1.
Factors and levels for orthogonal test design
| Level | Water to raw material ratio (A, ml/g) | Ultrasonic temperature (B, °C) | Ultrasonic time (C, min) |
| 1 | 20 | 50 | 30 |
| 2 | 25 | 60 | 40 |
| 3 | 30 | 70 | 50 |
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