What you observe,What to compare next,Project note
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.",
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.",
"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 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.",
Confirm the next action,"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.",
Confirm the next action,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.","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.",