Injection Molding
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ASA Flash Overflow
Problem Phenomenon
【Problem Phenomenon】Flash at ASA parting line and ejector pins, trimming cost increases
Cause Analysis
Excessive injection pressure, insufficient clamping force, parting line wear or too deep venting cause overflow; ASA medium viscosity has medium sensitivity to gaps; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based only on experience
Solution
Reduce injection pressure and holding pressure; verify clamping force margin; repair parting line; vent depth controlled at material lower limit; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
ASA flash first reduce pressure then check clamping, parting line wear must be repaired; 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 subsequent similar problems
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