Processing Machinery
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PET thickness fluctuation
Problem Phenomenon
PET sheet longitudinal thickness fluctuates periodically
Cause Analysis
Thermal expansion drift of die bolts or metering pump speed fluctuations cause periodic thickness changes; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Adjust die bolts in hot state; closed loop between metering pump and extrusion speed; online thickness measurement feedback; 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
Longitudinal thickness relies on metering stability and online closed loop; 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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