Molds & Tooling
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PCABS Venting Silver Streaks
Problem Phenomenon
[Problem Phenomenon] PC/ABS silver streaks are concentrated at the product ends and ribs, with a regular distribution
Cause Analysis
Poor venting type silver streaks: gas is trapped at the parting line, ends, and ribs, and the gas cannot be discharged and is pressed on the surface layer to form silver streaks; often accompanied by burning; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Open venting grooves of 0.03-0.05mm at ends and ribs; add venting inserts in deep cavities; reduce end-stage injection speed to let gas out; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
For venting silver streaks, watch the ends and ribs, with venting grooves of 0.03-0.05mm; 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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