Processing Machinery
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PET acetaldehyde exceeding standard
Problem Phenomenon
Water bottles have odor complaints; acetaldehyde content tested exceeds the standard
Cause Analysis
Excessive melt temperature or excessive retention causes PET to degrade and generate acetaldehyde; water bottles are extremely sensitive to acetaldehyde; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Take the lower limit of melt temperature; shorten retention time; include acetaldehyde content in factory inspection; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
Acetaldehyde is a hygiene indicator for water bottles; temperature control is fundamental; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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