Material Drying
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PA12 Transparent Grade Processing
Problem Phenomenon
【Problem phenomenon】Transparent PA12 (TR90 type) products had uneven transparency, with flow marks and specks
Cause Analysis
Transparent grade PA12 is more sensitive to drying and melt cleanliness: moisture and impurities directly manifest as visible defects; keeping the melt stable within the 230-250℃ processing temperature window is the prerequisite for transparency
Solution
Strictly execute transparent grade drying at 90-100℃×4-10h; do not exceed the melt temperature limit of 230-250℃; make mold temperature and cooling uniform to prevent optical distortion; prohibit or strictly limit regrind
Key Takeaway
The cleanliness of transparent PA12 is its transparency; both drying and temperature are strictly controlled; 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 troubleshooting similar problems in the future
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