Material Drying
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Drying management of PP '2079851475616104452
Problem Phenomenon
In humid seasons, the product occasionally shows silver streaks and bubbles.
Cause Analysis
Although PP has low moisture absorption, the moisture attached to the surface still exceeds the standard in humid environments; the regrind has higher moisture content.; during on-site investigation, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Appropriately dry the pellets in humid weather; ②dry the regrind separately; ③store sealed; ④monitor environmental humidity.; after adjustment, continuously sample and verify the effect, and resume mass production after confirming stability
Key Takeaway
Low moisture absorption material does not mean no drying is needed; moisture-proof management in the rainy season cannot be omitted.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for investigating similar problems in the future
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