Material Drying
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LLDPE drying judgment
Fenómeno do problema
LLDPE nominally does not absorb water, but the film still shows bubbles in the rainy season.
Análise das causas
LLDPE water absorption is extremely low; bubbles mostly come from regrind moisture, attached water, or entrained air; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience.
Solução
New material sealed, no drying needed; regrind and rainy season dried at 80℃ for 1-2 hours; for bubbles, first check entrained air; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Conclusão principal
LLDPE drying is executed as needed, regrind must be baked; 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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