Troubleshooting Hot Skin and A Colder Preform Wall in PET Preform Infrared Heating
The expensive mistake is to change hardware before the job has a measurable definition. Start with the workpiece, the acceptance test and the operating envelope. That keeps the investigation narrow enough to learn from.
Start With the Symptom
Write the defect in observable terms—where it appears, when it began and whether it follows a zone, recipe or material lot. “Not enough a repeatable axial and through-wall stretch temperature profile” is too broad to diagnose.
Work Through the Cause Chain
- Confirm material and incoming condition.
- Check presentation, distance and motion through the working zone.
- Verify the measurement method and sensor view.
- Inspect lamps, reflectors, cooling, rotation chain and shields.
- Change one variable and repeat the acceptance test. The result can shift with preform geometry, colour, rotation, spacing and speed, geometry, surface condition, distance, airflow, line speed and the way temperature or dose is measured. Record those conditions together; a setting without its context cannot be reused reliably.
Stop Conditions
Stop the trial if guards, cooling, exhaust, interlocks or the approved operating envelope cannot be maintained. Never bypass guards or interlocks to observe or adjust the heating oven.
Where the Product Record Fits
The current Oyate record describes a 260 mm, 400 V, 3500 W shaped halogen infrared lamp record listing PET preform heating among its applications. That makes it a candidate to review only after the required preform surface, wall and zone-response measurements and mechanical/electrical interfaces are written down. Compare the documented record at Oyate shaped halogen lamp record, then qualify the installed result on representative work. The catalogue is evidence of an available product family; it is not proof of suitability for this task.
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