Material Drying
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PA66 raw material opening management
Problem Phenomenon
A whole package of PA66 opened and used over three days, third-day material products show silver streaks
Cause Analysis
After opening, material continuously absorbs moisture from the environment, third-day moisture content already exceeds 0.2%, original dried state failed; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Open in sub-packages by shift usage; unused material sealed with desiccant for storage; re-bake 2 hours before reuse; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Opened material is managed as wet material, sub-packaging, sealing plus re-baking; 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 subsequent similar problems
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