Direct answer
Start with the failure that must be detected: channel leak, weak seal, pinhole, closure leak or gross opening. Select a method with adequate sensitivity for the pack, define sample conditioning and acceptance, correlate the result with real failures, and use trend data to correct the sealing process.
Define the failure mode and required sensitivity
A burst, vacuum, pressure-decay, dye, bubble, peel or visual test detects different defects. Describe the smallest relevant leak or seal weakness and why it matters to shelf life, contamination, transport or customer use.
Use intentionally defective samples to prove that the method detects the target fault.
Control sample preparation
Pack temperature, dwell after sealing, product contamination, headspace, flexible-film relaxation and closure torque can change the result. Define when and how the sample is tested.
Use normal and worst-case materials, seams and seal positions.
Separate destructive and non-destructive roles
Destructive tests can provide detailed seal-strength or failure-location evidence but consume packs. Non-destructive tests may inspect more product but require suitable fixtures, limits and validation.
A combined plan often uses frequent non-destructive screening and periodic destructive confirmation.
Link failures back to process settings
Record jaw temperature, pressure, dwell, alignment, contamination, line speed, cooling, cap torque or induction energy alongside the test.
Trend by lane, jaw, head, material reel and shift so the process cause is corrected rather than only increasing inspection.
Information to prepare
- Target failure mode and minimum sensitivity
- Representative good and defective samples
- Conditioning time and test environment
- Fixture and instrument capability
- Acceptance limit and sampling plan
- Process-setting data linked to results
- Containment and corrective-action procedure
Packaging Automation UK
Inspection, reject and line-integration routes for packaging-quality control.