Our company produces frozen pizza crusts. These crusts are par frozen when packed and cases sent through out metal detector. The aperture height is approximately 9.5". Currently we are able to detect 4.0mm SS, 4.0mm Non-Ferrous & 3.0mm Ferrous on top of a case of product.
When I placed these into the middle of the case, none of these were detected. The ones that did detect were 4.5mm Ferrous, 5.0mm SS, but the non-ferrous will not consistently detect at 6.0mm.
Does it make sense to go further than 6.0mm for non-ferrous? Our product is only a few mm thick. How can one justify one way or the other?