Material Drying
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PA6 Raw Material Package Opening Management
Problem Phenomenon
Aluminum foil bag packaged PA6 is left for two days after opening before use, and the products show silver streaks
Cause Analysis
PA6 particles absorb moisture quickly in air; after opening, 48 hours of exposure can raise the moisture content back above 0.5%, and even originally qualified dry packaging becomes invalid
Solution
Use the raw material immediately after opening or transfer it to the drying hopper; seal and store unused material and re-dry it before use; open packages according to the production plan and avoid unpacking in advance
Key Takeaway
PA6 must be managed as wet material after opening, and sealing and immediate use are the basic principles; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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