Investigating Tube Seal Failures: Looking Beyond the Obvious Defect
A failed tube seal is one of the most visible packaging defects encountered in production.
When a defect like the one shown below is discovered, the immediate assumption is often that the tube itself has failed.
However, packaging failures rarely result from a single factor.
The Visible Defect
In this case, the seal area did not form a complete and reliable bond, creating a potential path for product leakage.
At first glance, the root cause may appear straightforward.
In reality, the visible defect is only the starting point of an investigation.
Potential Contributing Factors
A tube seal failure may be influenced by several variables, including:
- Tube material consistency
- Sealing temperature
- Sealing dwell time
- Equipment condition and maintenance
- Production speed
- Setup adjustments during changeovers
- Operator intervention
Each of these factors can affect seal integrity and should be reviewed during the investigation process.
Avoiding Assumptions
One common mistake in packaging investigations is focusing immediately on the component where the defect appears.
The question should not be:
"Who is responsible?"
Instead, the investigation should begin with:
"What changed in the process?"
A systematic review of materials, equipment, process settings, and production conditions often provides a clearer understanding of the true root cause.
Looking at the Entire Packaging System
Successful packaging performance depends on more than the package itself.
It is the result of an entire system working together, including materials, machinery, validated process parameters, and operational controls.
The visible defect may identify where the failure occurred.
Root cause analysis identifies why it occurred.
