| A | additive ratio (% wt/wt) |
| d | pellet diameter (mm) |
| E | elasticity modulus for pellet compression (MPa) |
| Ej | specific pellet compression work (mJ·mm−2) |
| F | compaction / compression force (N) |
| k | water absorption by crushed pellets (g H2O·g−1 DM) |
| lc | die height (mm) |
| lp | pellet length (mm) |
| MC | material moisture content (% w.b.) |
| pm | maximum agglomeration pressure (MPa) |
| t | material temperature (°C) |
| ρp | single pellet density (kg·m−3) |
| σc | maximum tensile strength (MPa) |
| CC | calcium carbonate |
| CS | cassava starch |
| WS | wheat straw |
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