Extrusion & Post
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PET sheet transverse streaks
Fenómeno del problema
Periodic transverse lines appear on the sheet, similar to water ripples; thickness measurement is normal
Análisis de la causa
Transverse lines are an inherent defect source of the calendering process: the speed difference between two calender rolls forms imprints; when the speed regulation accuracy of the three rolls is insufficient, transverse lines appear periodically; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
① Improve the speed regulation accuracy of the three-roll calender; ② check the roll system transmission clearance; ③ optimize the haul-off speed matching; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
PET sheet transverse lines point to roll system speed accuracy; upgrading the speed regulation system can cure such periodic defects better than adjusting the process; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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