Extrusion & Post
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PET three-roll temperature matching
Problem Phenomenon
The PET sheet has poor flatness after winding and locally sticks to the rolls
Cause Analysis
Improper matching of the three-roll temperature and speed causes internal stress from poor roll contact, and too high a temperature causes roll sticking; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Adjust the roll temperature and roll speed matching according to the sheet thickness; clean the roll surface and check the demolding state; cool fully before winding; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Three-roll temperature-speed matching is the key to sheet flatness; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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