Hi,

I'm designing a new 4 cavity mold and I need to know how much ton that I need to hold both halves close to be sure my machine can hold it. Me and a friend are talking each other different : I said that the surface area that must be know to calculate holding pressure is the surface area of the plastic at the parting line only and my friend said we must use the complete surface area of the mold which is the surface of the mold minus the surface of the core.
Click image for larger version. 

Name:	Clampingcalculation.jpg 
Views:	706 
Size:	21.6 KB 
ID:	22933
Which is right??? I think I'm right...