- A critical defect.
This is a path of non-bonding across the width of the seal that will generally leak.
- The settings for longitudinal sealing or transversal sealing jaws were not correct (i.e., the temperature, pressure and/or dwell time).
- Hard lumps of molten plastic squeezed out during sealing may puncture the package from inside along the seal during post-process handling.
- Contaminants were present in the seal area during seal formation.