Material Drying
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LLDPE non-hygroscopic drying
Fenómeno del problema
Silver streaks and bubbles appear on the LLDPE product surface; pellets stored in the humid season have more obvious problems.
Análisis de la causa
LLDPE is a non-hygroscopic polyolefin and usually does not need drying; but moisture and dust attached to the pellet surface, after humid storage, vaporize in the 200-260℃ melt forming surface defects.
Solución
①Normally no drying is needed; ②humid-stored material dried at 80℃ for 1-2 hours; ③store pellets sealed, regularly clean dust from conveying pipelines; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Conclusión clave
LLDPE drying is moisture prevention rather than dehydration; sealed storage is primary, and damp material recovers with 80℃×1-2h; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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