Extrusion & Post
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PET sheet scratches
Fenómeno del problema
Thin long scratches appear on the surface of PET high-gloss sheet
Análisis de la causa
Foreign matter on the roll surface or particles of different hardness scratch the surface during calendering; guide roller burrs also scratch; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
Regularly clean and polish roll surfaces; check guide rollers for burrs; workshop dust prevention management; 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
Conclusión clave
Scratch prevention of high-gloss sheet relies on roll surface and environmental hygiene; 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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