Material Drying
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PA6 Plum Rain Season Drying Intensification
Problem Phenomenon
Producing PA6 with conventional processes in the plum rain season, the defect rate of silver streaks and bubbles rises significantly
Cause Analysis
In the plum rain season, the ambient humidity is above 90%, the raw material absorbs moisture quickly, the dryer load increases, the dehydration margin of conventional drying conditions is offset by the high-humidity environment, and the moisture content at the drying endpoint is high
Solution
In the plum rain season, extend the drying time by 1-2 hours and increase the frequency of moisture content sampling; dehumidify the workshop and raw material warehouse, and open raw materials just before use; when necessary, take the upper drying temperature limit of 100°C
Key Takeaway
In high-humidity seasons, the drying standard must be systematically raised, and relying on the original process parameters alone is not enough; 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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