Table 3.
Analysis of variance linear model for ultimate tensile strength against processing parameters.
| Source | df | Sum of Squares | Mean Squares | F-Value | p-Value |
|---|---|---|---|---|---|
| Model | 7 | 9.5998 | 1.3714 | 31.07 | 0.000 |
| Linear | 5 | 8.4735 | 1.69469 | 38.39 | 0.000 |
| Mould Temperature | 1 | 0.0107 | 0.01068 | 0.24 | 0.627 |
| Injection Speed | 1 | 0.3843 | 0.38433 | 8.71 | 0.007 |
| Back-Pressure | 1 | 0.0369 | 0.03691 | 0.84 | 0.369 |
| Melt Temperature | 1 | 5.9321 | 5.9321 | 134.38 | 0.000 |
| Holding Time | 1 | 2.1094 | 2.10944 | 47.78 | 0.000 |
| 2-way interactions | 1 | 0.7347 | 0.73466 | 16.64 | 0.000 |
| Melt Temperature × Holding Time | 1 | 0.7347 | 0.73466 | 16.64 | 0.000 |
| Curvature | 1 | 0.3917 | 0.39165 | 8.87 | 0.006 |
| Residual | 25 | 1.1036 | 0.04415 | ||
| Total | 32 | 10.7034 |