A
capillary rheometer is in essence, a highly instrumented ram extruder
with extremely accurate ram speed & temperature control, pressure
drop measurement and capillary die geometries. For more information on
the measurement principles click HERE.
Gammadot uses
a Celsum Technologies ACR 2100 series precision capillary rheometer
to perform viscometry measurements across shear / extensional rate ranges
relative to polymer processing. The rheometer is capable of measuring
viscosity data at shear rates in excess of 250,000 1/s and, in addition
to providing the required viscosity data for applications such as injection
moulding / extrusion flow simulation, is ideal for discriminating processing
problems such as melt fracture, die swell, slippage flow, shark skinning,
etc.
The instrument is fully computerised, which allows automatic testing and data collection. The data analysis system fits routine rheological corrections, plus a large number of shear and extensional flow models, as utilised by the leading finite element flow analysis packages such as Moldflow & Sigmasoft 3D. Test methods are in general accordance of the following standards: BS 2782: Part 7: Method 722B:1996, ISO 11443:1995 & ASTM 3835 – 96.
The instrument is fully computerised, which allows automatic testing and data collection. The data analysis system fits routine rheological corrections, plus a large number of shear and extensional flow models, as utilised by the leading finite element flow analysis packages such as Moldflow & Sigmasoft 3D. Test methods are in general accordance of the following standards: BS 2782: Part 7: Method 722B:1996, ISO 11443:1995 & ASTM 3835 – 96.
