To measure flow rate by extrusion Plastometer.
Specimen:
Any form which can be introduced into the cylinder bore may
be used. e.g. powder, granules, strips of film. Conditioning required varies
with material.
Procedure:
The apparatus is preheated to 190oC for PE.
Material is put into the cylinder and the loaded piston (@ 43.25 psi) is put
into place. After 5 minute the extrudate issuing from the orifice is cut off,
flush and again one minute later. These cuts are discarded. Cuts for the test
are taken at 1, 2, 3 or 6 minutes depending on the material or its flow rate.
The melt index is calculated and recorded as gm/10 minute.
Significance:
It is primarily useful to raw material manufacturer
as a method of controlling material uniformity. The melt index value is
strongly indicative of relative “flowability” of various kinds and grades of
PE. The ‘property’ measured by this test is basically melt viscosity or ‘rate
of shear’. In general, the higher molecular weight materials are more resistant
to flow. 
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