Table 1 Spinning conditions of the various double layer membranes.
M 1 | M 2 | M 3 | M 4 | M 5 | M 6 | |
|---|---|---|---|---|---|---|
Inner layer (PES/PVP) | 15/5 | 15/7 | 15/10 | 15/10 | 15/7 | 15/7 |
Outer layer (PES/PVP/AC)** | 14/1.4/37.5 | 14/1.4/60 | 14/1.4/60 | 14/1.4/60 | 14/1.4/60 | 14/1.4/60 |
Inner layer pumping speed (ml/min) | 0.5 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 |
Outer layer pumping speed (ml/min) | 1 | 1.6 | 2 | 1.6 | 1.6 | 1.6 |
Bore liquid pumping speed (ml/min) | 1.2 | 1.2 | 2 | 2 | 1.2 | 1.2 |
Bore composition* | B1 | B1 | B2 | B2 | B2 | B1 |
Air gap (cm) | 15 | 15 | 10 | 10 | 10 | 10 |
Spinneret type | Spinneret 2.0 | Spinneret 2.0 | Spinneret 2.0 | Spinneret 2.0 | Spinneret 2.0 | Spinneret 2.0 |
Collecting speed (m/min) | Free fall | Free fall | Free fall | Free fall | 3.5 | 3.5 |
