Material Drying
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PCABS Silver Streaks Four Causes
Problem Phenomenon
[Problem Phenomenon] PC/ABS product silver streaks and material streaks appear repeatedly, and single machine adjustment cannot cure them
Cause Analysis
90% of PC/ABS silver streaks originate from four categories: moisture (insufficient drying), material thermal decomposition (temperature/residence time), poor venting (trapped gas), and shear overheating (excessive speed); they must be classified and located
Solution
Troubleshoot according to the four categories: first verify moisture content ≤0.02%, then check melt temperature and residence time, then check venting, and finally check shear speed; eliminate item by item; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
PC/ABS silver streaks have four causes; investigate one by one without blind adjustment; 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 similar problems in the future
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