Salmon Can Lid Seal Inspection
The challenge was to inspect the 360 degree radial integrity of the rolled top seal at ten cans per second. The defect of the seal shows up as small <0.01” protrusions which are the same color and contrast as the can and seal. The defects were previously detected exclusively by humans rubbing their fingers along the seal interface.
Newton engineers developed a circumferential array of area scan cameras and a custom overhead illuminator that caused a specific shadow to be cast only when the defect was present below the seal. The vision system would detect and measure this shadow to determine if the defect was cause for rejection.