Classification
- A major defect if:
- There is visual evidence of seal overheating, such as bubbles or exposed foil
- There is less than 3 mm (3/32-inch) of continuous good seal (non-delamination)
- Is considered a minor defect if:
- There is some visual evidence of seal overheating, such as bubbles or exposed foil
- There is more than 3 mm (3/32-inch) of continuous good seal
Identification
A compressed seal is any separation of the laminated plies in the seal area. The material bond strength is questionable in the area of the defect.
Causes
- The sealing bar settings were not correct during sealing (i.e. excessive temperature, pressure and/or dwell time).
- Material bond strength is inadequate.