Extrusion & Post
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PET BOPET film
Problem Phenomenon
BOPET film frequently breaks during stretching
Cause Analysis
Uneven crystallinity of the cast sheet or deviation of the stretching temperature window causes local stress to exceed the limit and break the film; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Uniformize cast sheet cooling and crystallization; stretching temperature and ratio according to the process window; online defect detection linkage; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
BOPET film breakage relies on cast sheet quality and stretching window control; 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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