Material Drying
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PA12 Silver Streak Multi-cause Troubleshooting
Problem Phenomenon
【Problem phenomenon】PA12 products repeatedly showed silver streaks, which were still not eradicated after strengthening drying
Cause Analysis
In addition to insufficient drying, silver streaks also stem from excessively high melt temperature, excessively fast injection speed, and material impurities; solely strengthening drying cannot cover all causes; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
First confirm that drying meets the standard, then troubleshoot in sequence: lower barrel temperature and screw speed, lower injection speed and pressure, check material impurities, and appropriately increase back pressure for venting; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The four causes of silver streaks are drying, temperature, speed, and impurities; when drying is ineffective, check further down; 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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