Seam Length is also known as Seam Width or Seam Height and is a critical external measurement.
Incorrect seam length can cause false seams and other critical defects. It is usually caused by incorrect overlap and is a clear indication that something is terribly wrong with the seam…
Note that it is insufficient to measure this value at one point and it is crucial to measure as many points as possible for length issues. Ultimately, a non destructive system like SEAM360 is a way to ensure that the Seam Length is correct around the entire circumference of the can.
How to measure Seam Length?
- Seam length can be measured manually using a seam micrometer,
- Since seam length is apparently unaffected by cutting the seam (double seam section saw) the measurement can be done automatically using a seam inspection software such as SEAMetal.
Possible causes of high (excessive) Seam Length:
- 1st operation roll setup is too loose!
- 2nd operation roll setup is too tight!
- Damaged tooling
- Long Body Hook
- Incorrect roll profile!
- Worn or damaged tooling!
How to fix it?
The simplest way to fix excessive Seam length is to use a clearance gauge.