Injection Molding
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PCABS Shear Silver Streaks
Problem Phenomenon
[Problem Phenomenon] PC/ABS silver streaks consistently appear near the gate or in high-speed filling areas
Cause Analysis
Shear overheating type silver streaks: excessive injection speed and too small gate cause local friction heat generation, cracking and gas production; the location is fixed in the shear concentration area; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Reduce injection speed and change to multi-stage; enlarge gate size; appropriately lower melt temperature in shear areas; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
Shear silver streaks are fixed near the gate; reduce speed and enlarge the gate; 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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