Material Drying
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LDPE Film Regrind Blending Bubbles
Fenómeno del problema
After blending in regrind, film bubbles and gel particles increase.
Análisis de la causa
Regrind has high moisture content and may carry impurities; air brought in by crushed film flakes also affects melt quality.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solución
①Re-dry the regrind; ②Control the blending ratio; ③Screen to remove impurities; ④Strengthen plasticizing and venting.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Conclusión clave
Regrind quality determines the blending upper limit; drying and impurity removal are basic requirements.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; Incorporate this case into the defect archive as a troubleshooting reference for similar future problems.
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