In extrusion, the material is forced through a die to create a continuous profile. The rate at which material exits the die, known as the extrusion rate, depends primarily on the geometry of the extrudate (its diameter) and the speed of the screw or barrel that drives the melt.
The volumetric flow can be expressed mathematically by multiplying the crossβsectional area of the extrudate by its linear velocity. For a circular profile this leads to a relationship that incorporates the diameter (D) and the rotational speed (N) of the screw, which together define how quickly material is delivered to the die.
Understanding this relationship allows engineers to predict production capacity, adjust processing parameters, and ensure consistent product dimensions. The formula below captures the core physics of extrusion rate for a circular strand.
D = diameter of extrudate (mm)
N = screw speed (rpm)
What is extrusion rate in manufacturing?
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Results are for informational purposes only and do not constitute professional advice.