Material Drying
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PA6 Insufficient Drying Time Judgment
Problem Phenomenon
Starting production after only 2 hours of drying, the products are normal in the morning, but silver streaks begin to appear in the afternoon
Cause Analysis
Drying PA6 at 80°C for 2 hours usually only removes the surface moisture, and the moisture in the core of the particles is not fully removed; in the morning the surface material dried first is used, and in the afternoon the insufficiently dried core material is used, causing silver streaks
Solution
PA6 dehumidifying drying time is not less than 4 hours, extended to 6 hours when the loading volume is large; the drying endpoint is judged by actual moisture content measurement rather than time experience, and start-up is allowed only when the moisture content is below 0.2%
Key Takeaway
Drying time must be based on ensuring the moisture content meets the standard and cannot be shortened based on experience; 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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