The seam formed is generally leak proof, but this depends on the product being canned.
The seam is made by mechanically overlapping the two layers to form a hook.
Different parameters of the hook are measured and monitored to check the integrity of the seam under different conditions.
The first operation seam is critical to avoid problems like wrinkles (tightness issues) and leaks.
New products like the clearance gauge are able to let even novice users adjust seamers and optimize them, as well as locate problems with broken/damaged tooling, shank/bushing issues, seamer adjustment issues, or broken bearings.