Determination of the flow coefficient
Determination of the flow rate using Method A: mass flow rate (MFR)
In this method, the extrudate is cut at regular intervals and the weight is then determined using a scale. The result is the extruded mass per unit of time, usually expressed in g/10 min.
Determination of the flow coefficient using Method B: volumetric flow rate (MVR)
This method requires the plastometer to be equipped with a piston motion sensor. The MVR result is the volume of extruded material per unit of time and is expressed in cm³/10 min. The weight coefficient is determined from the distance the piston travels per unit time.
The photo shows the ZwickRoell Mflow Plastometer device