Table 5. Variables and Levels for the Single-Factor Experiment.
| variables | levels | |||||
|---|---|---|---|---|---|---|
| moisture content of the material (%) | 10 | 12 | 14 | 16 | 18 | 20 |
| forming pressure (kN) | 50 | 75 | 100 | 125 | 150 | 175 |
| mass percentage of straw (%) | 0 | 3 | 6 | 9 | 12 | 15 |
| forming temperature (°C) | 50 | 80 | 110 | 140 | 170 | 200 |