Thermoforming
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PET sheet uneven thickness
Problem Phenomenon
Large transverse thickness deviation of the sheet, uneven winding tightness, and wall thickness out of control after '2079851475616104458
Cause Analysis
Extruder output fluctuations make melt pressure unstable; improper die lip gap adjustment causes uneven flow distribution; poor calender roll alignment is directly replicated as thickness deviation; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
① Stabilize extrusion pressure; ② regularly calibrate the die gap; ③ keep calender rolls aligned and use an automatic thickness measurement system for closed-loop control; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Sheet thickness is a comprehensive indicator of extrusion stability; three-ring calibration of pressure, die, and roll system plus online thickness measurement is the standard configuration; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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