Contact person
Max Anderhell
Forskare
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Capillary rheometer
A capillary rheometer is used to measure a material's flow properties at high shear rates. The results can be used for both material development and to predict a suitable processing window in extrusion, injection moulding, or fibre spinning.
Purpose
Capillary rheometry is relevant for anyone interested to evaluate and/or develop polymeric materials for processing in the melt or in high viscosity solution.
Method
In a capillary rheometer, the material is placed in a cylindrical chamber to be extruded through a smaller capillary, while measuring the inlet pressure. The temperature in the chamber can vary from room temperature to 300°C, and possible shear rates range from 0.1 s-1 to 100,000 s-1.
Our Netzsch Rosand RH10 rheometer has two parallel cylinders and is equipped with haul-off, so that besides viscosity, it can measure melt strength as a function of take-up speed.
Approximately 100 grams of material are required for a test.
The instrument is suitable for testing according to ISO 11443.
Deliverables
Report containing:
• Viscosity curves as a function of shear rate and temperature.
• Melt strength as a function of extrusion and collection speed.
A small amount of collected filament on a spool, during melt strength testing.
