Processing Machinery
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PET sheet die lines and flow marks
Fenómeno del problema
Longitudinal long streaks and flow marks appear on the sheet surface; uneven gloss leads to downgrading
Análisis de la causa
Die lip buildup scratches the melt surface to form die lines; unstable melt flow produces flow marks; impurities from damaged filter screens disturb flow uniformity; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
① Regularly clean die lip buildup with a copper scraper; ② improve filtration performance; ③ keep extrusion pressure and temperature stable; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
Die lines are a chronic appearance disease of PET sheet; frequent die lip cleaning plus stable pressure and temperature, together with intact filter screens, can maintain a mirror surface; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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