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The OCS Filter Pressure Test (FPT) determines the Filter Pressure Value (FPV), i.e. the pressure rise measured over time upstream of the screen filter as an indication of the melt purity or dispersibility of added colour pigments. The OCS Measuring Extruder (ME) melts and homogenises the test material, which is then delivered to the filter via a melt pump at a defined and constant volume flow. The increasing pressure of the polymer melt is displayed, continuously recorded and finally evaluated.
| Barrel diameter | 20, 25, 30 mm (3 heating zones with thermocouples for barrel, 4 additional heating zones for melt pump and adapter, 3 cooling zones with low-pressure blower) |
| Screw compression | 1:1, 2:1, 3:1, 4:1, with and without mixing zone (others on request) |
| Rotation | 0–150 rpm |
