The metering time or melt throughput is a key parameter for the layout and selection of an injection molding plasticizing unit.
Precise advance calculation of the metering time or the melt throughput is of decisive importance for a comprehensive theoretical description of the plasticization phase in injection molding.
This permits the conveying behavior and hence the metering time to be calculated.
Using the physic-mathematical model presented in (1-6), it is possible to calculate the metering time and the melt throughput on conventional injection molding plasticizing units.
The explicit expressions of this equation and the procedure to be followed for calculating the metering time may be found in the literature (1-6).
In the metering time and throughput calculation that has been implemented to date, no allowance has been made for the leakage flow over the screw flights.
35 mm through wear, there is a considerable increase in the metering time between 18 and 52%.