Which Parameters to Maintain…?

I received this question this morning…

After establishing the injection molding process for particular part, which parameters should we keep constant during the next subsequent production run? Whether it is Injection time, injection speed, or switch over position, or any other parameter. 

My Response
Actually, the focus should not be on the machine inputs, but the actual process outputs. this is a little more complicated, but below are some examples:
Input Output
Barrel Temp Melt Temperature
Shot size 1st Stage Fill Time
Transfer 1st Stage Fill Weight
Screw RPM Recovery Time
The focus is on the outputs because the material grade or machine may change, but the process itself should have the same characteristics. 
I discuss this in more detail in the following links:


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