Water bottling line troubleshooting guides
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PET Bottle Blowing Defects: Use Cavity and Time Patterns
A defect photograph alone rarely distinguishes material, preform heating, mold conditions and handling. Sort defective and acceptable bottles by cavity, preform lot, format and time. Keep the approved bottle specification available before judging wall distribution, shape or performance.
Follow the observed pattern
| What you observe | What to compare next |
|---|---|
| One cavity repeatedly differs | Retain cavity mapping and matched samples from other cavities. Ask maintenance and the blowing specialist to inspect the relevant tooling and machine condition under isolation. |
| Defects move with a preform lot | Keep unused preforms and lot records. Compare dimensions, storage history and agreed material requirements with the supplier before changing the whole oven recipe. |
| Several cavities change after startup | Compare the time sequence, recipe revision and recorded thermal and utility conditions. A shared startup pattern needs a different investigation from a persistent single-cavity defect. |
Evidence to send with a support request
Send cavity-coded samples, preform and bottle drawings, material lots, defect categories, recipe history and the approved performance test. Visual appearance does not establish top load, wall distribution or suitability for the filling and packing line.
Illustrative diagnostic comparison
If one cavity produces a repeated defect while matched neighboring samples remain acceptable, preserve that mapping during review. If all cavities change with one lot, maintain the material comparison. Do not compensate by uncontrolled pressure or temperature changes.
Confirm the next action
Record the bottle, cap and material lot; machine and format recipe; time, speed and operating state. Separate direct observations from suspected causes. Preserve an unchanged comparison and identify who approved any trial.
- Record the approved change, comparable before-and-after observations, defect counts with their denominators, and quality or maintenance approval. A symptom disappearing once does not establish a durable correction.
- Repeat the check during the operating state that originally produced the defect. Keep restart losses and rejected product in the record; a faster machine reading alone is not proof of improvement.
Use approved site procedures and the machine manual. Isolate energy before physical inspection or clearing a jam; never bypass guards or interlocks. Quality personnel decide containment and release of affected product. These guides do not prescribe universal pressure, temperature, torque or cleaning settings.
Download the investigation record CSV
Related specification and planning guides
Required evidence — PET Preform Heating Oven Planning
| Input or result / Unit | Evidence to request | Substitution to avoid |
|---|---|---|
| Preforms inside oven (Quantity) | Confirm the number of occupied preform positions inside the defined oven section during the observation. Identify excluded entry, transfer or empty positions. | Total installed carrier positions can differ from occupied heating positions. Use the count corresponding to the throughput boundary in the residence-time estimate. |
| Bottle rate (Bottles/h) | Identify the counted bottle boundary and the exact observation interval. Retain opening and closing counter readings, accepted quantity and operating mode so the hourly rate can be reproduced. | A machine nameplate rate, instantaneous display and accepted output over a shift are different records. Do not substitute one for another without stating the change of basis. |
Mr Kcal · Allot Tech (Suzhou) Co., Ltd.
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