The Melt-Flow Indexer is the most widely spread indicator of plastics
processability. The time taken for molten material to be subjected to a
specified load and extruded out of the orifice, the weight of the extruded
material, and the specified amount of movement are used to determine the melt
mass flow rate (MFR) and the melt volume rate (MVR), along with other factors.
The equipment comes in four models, with Method A (parallel cutout method) and
Method B (automatic timing method), along with manual and automatic computation