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Pretreatment conditions of the materials used during this work.
| Raw material | Temperature (°C) | Holding time (min) | pH∗ | Average SF | |
|---|---|---|---|---|---|
| Spruce | Severe | 212 | 4–8 | 1.6–1.8 | 4.08 |
| Mild | 200 | 4–8 | 1.8–2.0 | 3.72 | |
| Pine | 210–215 | 5 | 1.5–1.7 | 4.01 | |
| Birch | 190 | 4–6 | 1.8–2.0 | 3.35 | |
∗The value of pH is for the slurry after the pretreatment.
