Properties of the papers used in this study.
| Properties | Paper | Paper & primer | Paper & primer & pigments & starch | Hydrophobized paper & starch |
|---|---|---|---|---|
| HSI surface treatment (primer) [g m−2] | 0 | 0 | ∼0.25 | ∼0.25 |
| Pigmentation [g m−2] | 0 | 0 | 4 | 0 |
| Surface starch [g m−2] | 0 | 0 | ∼1 | ∼1 |
| Hydrophobisation (AKD sizing) [kg t−1] | 0 | 0 | 0 | 1 |
| Filler content [%] | 22 | 22 | 23 | 14 |
| Grammage [g m−2] | 97.2 | 78.5 | 79.89 | 77.2 |
| Porosity [%] | 40.3 | 38.8 | 23.6 | 20.6 |
| Average pore diameter [μm] | 3.9 | 2.6 | 3.2 | 4.9 |
| Roughness [ml s−1] | 321 | 50 | 78 | 191.5 |
| Dispersive surface energy [mJ m−2] | 44 | 42 | 43 | 33 |
| Polar surface energy [mJ m−2] | 27 | 23 | 22 | 0.1 |
| Total surface energy [mJ m−2] | 71 | 65 | 65 | 33.1 |