Material Drying
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HDPE low water absorption drying
Problem Phenomenon
Silver streaks and bubbles appear on the surface of HDPE products, and the problem is more obvious with pellets stored in humid seasons
Cause Analysis
HDPE is non-hygroscopic and is a non-hygroscopic material, usually requiring no drying; but moisture attached to the pellet surface will still vaporize in the 200-280℃ melt after humid storage, forming silver streak and bubble defects
Solution
①Normally no drying is needed; ②dry humidly stored material at 80-90℃ for 2 hours; ③store pellets sealed to prevent surface moisture absorption; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
HDPE drying is moisture protection rather than dehydration; sealed storage is the main measure, and humid material is remedied at 80-90℃×2h; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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