Material Drying
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ASA Silver Streak Multi-Cause Troubleshooting
Problem Phenomenon
【Problem Phenomenon】Silver-white streaks repeatedly appear on the surface of ASA products, still not cured after strengthened drying
Cause Analysis
The main cause of silver streaks is residual moisture, but excessive melt temperature degradation, shear overheating, and material contamination also produce silver streaks; single strengthened drying only covers the moisture cause; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based only on experience
Solution
First verify moisture content ≤0.05%; then check melt temperature and back pressure shear; fixed silver streaks near the gate check shear overheating, overall random silver streaks check moisture; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
ASA silver streaks divide into three paths of water, heat, and shear, position distribution points to the cause; 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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