Capillary melt index tester

Melt Index Tester MTS Capillary Viscometer Automatic Capillary Rheometer ProcessibiLity Tester... 

Kayeness (Dynisco) Galaxy III, V Automated Capillary Rheometers Galaxy I Melt Index Tester ... 

The melt index tester is essentially a simple capillary rheometer. The piston is pushed down by a weight see Fig. 6.20(a) [99]. 

Simplified versions of capillary rheometers are melt flow testers, which are especially suitable for laboratory use since they are relatively easy to handle and represent a fast measure. However, they only give information about the fluidity at a certain shear rate which however for chemists in most cases is enough to judge the material s fluidity. Using a melt flow tester the measure of fluidity is not expressed in terms of the melt viscosity but as the amount of material extruded in a given time (10 min). The amount of extrudate per unit of time is called the melt index or melt flow index i (MFI). It is also necessary to specify the temperature and the shearing stress or load. Thus MF//2 (190 C) = 9.2 g/10 min means that at 190 C and 2 kg load, 9.2 g of polymer melt are extruded through a standard nozzle in 10 min. Today the expression melt flow index is often replaced by the melt flow rate (MFR)... 

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