Material Drying
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PP Silver Streak Moisture
Problem Phenomenon
【Problem Phenomenon】Silver streaks on the surface of PP products, misjudged as material problem
Cause Analysis
Although PP has low moisture absorption, condensed water on the pellet surface or moisture absorption vaporizes during processing into silver streaks; air entrainment also causes streaks; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
Dry damp material at 80°C × 2h; lower melt temperature; improve venting; moisture-proof storage; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
PP silver streaks are mostly due to moisture, check drying, venting and storage; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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