Material Drying
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PP Low Moisture Absorption and Drying
Problem Phenomenon
[Problem Phenomenon] Believing PP does not absorb moisture and omitting drying, parts occasionally show silver streaks and bubbles
Cause Analysis
PP has extremely low water absorption (<0.01%) and generally does not need drying, but condensed water on pellet surfaces or moisture exposure still causes silver streaks; moisture-affected material needs 80°C×2h drying; under normal circumstances it can be used directly without baking
Solution
Normal PP can be used directly; moisture-affected or surface-condensed material is dried at 80°C×2h; moisture-proof storage is the key; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PP is basically drying-free; moisture-affected material is remedied at 80°C×2h; 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 future problems
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