Metering Design
Nov 18, 2022
Metering section
Calculation of the optimum metering section
At a given throughput rate, the screw speed and pitch are determinative for the melt filled length t in the extruder, which is necessary to build uphe required pressure. This length can be calculated based on rheological data of the polymer, the expected operating conditions and the screw profile.
Viscosity curves
Viscosity curves are normally not available for filled and reinforced materials.
Influences on pressure build up capacity
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| The filled section will be longer with increased feed rate. | The pressure build-up improves with increased screw speed. | Less pressure requires a shorter filled length. | The pressure build-up improves with increased viscosity or reduced melt temperature. |
Reduction of consumed energy in metering section
