Material Drying
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LLDPE drying judgment
Problem Phenomenon
LLDPE nominally does not absorb water, but the film still shows bubbles in the rainy season.
Cause Analysis
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.
Solution
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.
Key Takeaway
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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