Cavity Balance for Blow Molding…

I received this question over the weekend…

What is the right procedure for performing a cavity balance test for a blow molding machine with an injection, pack and hold?
My Response
Basically, the procedure is similar to that of an injection molding machine. You would turn off the second and third stage, and then compare the shot weight of the different cavities.
Additional Thoughts
To calculate the % variation is as follows:
100% x (maximum weight – minimum weight) รท (maximum weight) = % Variation

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