These calculations produce guide values; the final selection has to be based on the part geometry, the mold design and the data from the material manufacturer. For an assessment specific to your application, contact our technical support team.
The screw has to melt the next shot within the cycle. The hourly requirement comes from the shot weight multiplied by the number of cycles per hour, and it is compared against the plasticizing capacity in the machine catalog.
Catalog capacities are usually measured with PS; with materials such as PA or PC the real capacity is lower. The tool therefore also suggests a value with a 25% safety margin. A capacity at its limit stretches the cycle — if dosing starts taking longer than cooling, the bottleneck is not the machine but the injection unit.
The method, the formula and the limits of each tool are explained directly underneath it, and the explanation changes with the tab you select. The results are engineering guide values; for an assessment specific to your application when choosing the final machine and equipment, contact our technical team.