In high-speed bottle manufacturing, quality control starts before the filling line. One of our long-term clients—an industrial bottling plant in the UAE—faced persistent problems with bottle integrity. Though the bottles passed visual inspection, some still leaked when filled or during transport.
After a thorough investigation, we discovered the problem originated right after the blow moulding machine—invisible micro-cracks and weak seams were going unnoticed.
The Challenge
Blow moulding produces thousands of bottles per hour. Even with tight temperature and pressure controls, there’s always a risk of:
- Thin wall sections due to uneven stretching
- Tiny holes at the base or shoulder
- Weak neck threading causing seal failure
These defects were not visible to the naked eye, and random sampling wasn’t catching them consistently.
The Solution: Installing a Leakage Tester Immediately After Blow Moulding
To catch defects before the bottles reached the filling area, we designed and installed a Plastic Bottle Leakage Tester directly after the blow moulding exit conveyor.
This system uses high-pressure air injection to test the integrity of each bottle in a closed chamber. A pressure drop indicates leakage, and the bottle is automatically rejected.
Key Features:
- Mounted just after bottle discharge conveyor
- Non-contact pressure test in under 1 second
- Reject chute with sensor confirmation
- Adjustable pressure settings per bottle size
- Built-in Delta PLC for real-time control
- 7-inch HMI with batch logging and test summary
Implementation Snapshot
- A compact SS304 leak test chamber was installed in line with the outfeed conveyor
- Bottles are diverted one-by-one using a pneumatic pusher
- Leak test cycle: pressurize → hold → monitor drop → decision
- Failed bottles are ejected into a bin with buzzer alert
We used Delta DVP PLC + analog pressure module + HMI, allowing the operator to monitor pressure curves and set alarm thresholds.
The Result
Within days of implementation:
- Leaking bottles were eliminated before reaching filling
- Production team gained confidence in quality control
- The factory added real-time test data to ISO audit logs
The client also noticed reduced bottle wastage at the filling line, and fewer complaints from downstream packing and delivery teams.
Conclusion
In blow moulding, defects happen—but they don’t have to become product losses. By placing a leakage tester immediately after moulding, manufacturers can isolate quality issues at the source and stop defects before they flow downstream.
If you’re in bottle manufacturing, this small addition to your line can save huge costs in rework, returns, and reputation.