Product novelty 14. September 2023
Melt Indexer mi40 visco
Viscosity measurement with Melt Indexer mi40 visco
Melt Flow Indexer are used to determine the melt index value. The standardized index is defined as Melt Flow Rate (MFR) in g/10min or Melt Volume Rate (MVR) in cm³/10min. The new viscosity option for the Melt Flow Indexer mi40 has been developed to perform measurements according to the standardized Capillary Rheometer standard ISO 11443. Compared to the ordinary MFR measurements, higher shear rates can be achieved, which are of high importance for the actual testing process. As a result, viscosity tests performed with this GÖTTFERT Melt Flow Indexer corresponds more to a processing control than a commercially available melt index test.
mi40 vs. MFR multi-weight measurements with HDPE,
Melt flow rate (190 °C/2.16 kg) = 9 g/10 min
The following graph shows a comparison between the determined viscosity obtained with several multi-load measurements with a L/D=8/2.095 mm MFR capillary in gray and with the Melt Flow Indexer (plastometer) mi40 visco with a L/D=10/1mm viscosity capillary in orange. The output viscosities recorded with the shorter MFR capillary are slightly higher because viscous effects such as input pressure loss are not corrected. The inlet pressure loss is even more important with shorter capillaries than with longer viscosity capillaries. In addition, the force of the motor added to the weight of the mi40 allows higher apparent shear rates to be achieved compared to normal melt index measurements. This allows measurements to be made in the shear rate range that is actually used during testing.
Melt Flow Indexer are used to determine the melt index value. The standardized index is defined as Melt Flow Rate (MFR) in g/10min or Melt Volume Rate (MVR) in cm³/10min. The new viscosity option for the Melt Flow Indexer mi40 has been developed to perform measurements according to the standardized Capillary Rheometer standard ISO 11443. Compared to the ordinary MFR measurements, higher shear rates can be achieved, which are of high importance for the actual testing process. As a result, viscosity tests performed with this GÖTTFERT Melt Flow Indexer corresponds more to a processing control than a commercially available melt index test.
mi40 vs. MFR multi-weight measurements with HDPE,
Melt flow rate (190 °C/2.16 kg) = 9 g/10 min
The following graph shows a comparison between the determined viscosity obtained with several multi-load measurements with a L/D=8/2.095 mm MFR capillary in gray and with the Melt Flow Indexer (plastometer) mi40 visco with a L/D=10/1mm viscosity capillary in orange. The output viscosities recorded with the shorter MFR capillary are slightly higher because viscous effects such as input pressure loss are not corrected. The inlet pressure loss is even more important with shorter capillaries than with longer viscosity capillaries. In addition, the force of the motor added to the weight of the mi40 allows higher apparent shear rates to be achieved compared to normal melt index measurements. This allows measurements to be made in the shear rate range that is actually used during testing.
GÖTTFERT
Werkstoff-Prüfmaschinen GmbH
Contact
Ms. Julia Volk