Time dimension
Vol. 19, #2, June 1992
Remember the time dimension to mixing problems. An extruder cannot compensate for time dependent variations in composition or material quality beyond about 1/10 of the extruder's residence time.
Beyond that, you must correct the problem upstream of the extruder by improved feeder accuracy or by effective pre blending.
See also
Colored mixing drums
Extruders
High-low melt blends