Since this examination is often done on an hourly basis, or so and certainly more often than a teardown evaluation. A good visual examination can very often head off major seam defects from getting to the packaging department. In addition, I believe that seam height can play a more critical roll in the correlation to seam tightness, more so than seam thickness. You may want to think about what happens in a double seam when the seam height grows, or gets shorter.
Many processors have difficulties in knowing how to conduct a good visual examination of the seam.
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