Material Drying
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PP Drying 0.1% Red Line
Problem Phenomenon
PP products show silver streaks and bubbles, drying is insufficient with moisture content exceeding the standard; although water absorption is low, management is still needed.
Cause Analysis
PP water absorption is low but not zero; moisture vaporizes in the 200-280°C melt; 0.1% residual moisture causes silver streak surface defects; high-temperature processing amplifies the effect of trace moisture; drying management is often neglected.
Solution
①Dry at 80-90°C for 2-3 hours; ②Verify moisture content <0.1%; ③Sealed storage to prevent moisture regain; ④Strengthen management in high-humidity environments; ⑤Check drying first when troubleshooting silver streaks.
Key Takeaway
PP's low water absorption does not mean zero drying; the 0.1% red line must be quantitatively verified; high-humidity environments are risk scenarios.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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