Material Drying
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LDPE Drying Judgment
Problem Phenomenon
LDPE is nominally non-water-absorbing, yet bubbles are still occasionally seen in products in the rainy season.
Cause Analysis
LDPE's water absorption is extremely low; bubbles mostly come from surface-attached water, regrind moisture, or entrained air; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
New material sealed can skip drying; regrind and rainy-season material dried at 80℃ for 1-2 hours; for bubbles, check air entrainment first; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
LDPE drying is performed as needed; bubbles are not necessarily attributed to moisture; 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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