Material Drying
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LDPE Non-hygroscopic Drying
Problem Phenomenon
Silver streaks and bubbles appear on the LDPE product surface; the problem is more obvious with pellets stored in humid seasons.
Cause Analysis
LDPE is a non-hygroscopic polyolefin and usually does not need drying; however, moisture and slip agent dust attached to the pellet surface, after humid storage, vaporize in the 160-240℃ melt to form surface defects.
Solution
①Normally no drying is needed; ②Humid-stored material is dried at 80℃ for 1-2 hours; ③Store pellets sealed, and regularly clean dust from conveying pipes; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
LDPE drying is moisture prevention rather than dehydration; sealed storage is the main measure, and moisture-affected material recovers at 80℃×1-2h; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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