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).
The influence of the following parameters is taken into account for the calculation of the throughput or metering time:
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.
Equations have been presented for the calculation of metering time and throughput, making allowance for the leakage flow.