Injection Molding
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SMMA Injection Speed Too Fast
Problem Phenomenon
SMMA products have surface jetting marks, silver streaks and internal stress caused by high-speed injection.
Cause Analysis
Although SMMA can be injected at high speed, too fast produces jetting; shear stress; air entrapment; internal stress freezing; influence on surface quality and transparency.; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based solely on experience
Solution
①High speed but control the upper limit; ②multi-stage injection slow-fast; ③decelerate in the gate area; ④surface quality monitoring; ⑤internal stress assessment.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The advantage of SMMA high-speed injection must be used with control; multi-stage is fine management; monitoring keeps surface quality.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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