Injection Molding
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PC Flash
Problem Phenomenon
Thin flash appears at the parting line and ejector pins, often accompanied by clamping alarms.
Cause Analysis
Under high-pressure filling, the cavity pressure exceeds the clamping force; PC requires high injection pressure and is more likely to push the mold open; parting line wear or insufficient clamping tonnage is the direct cause.
Solution
①Reduce injection/holding pressure; ②Calculate and increase the clamping force; ③Repair the parting line; ④Advance the holding pressure switchover point to avoid over-filling.
Key Takeaway
With PC's high-pressure process, the clamping margin must be left sufficient.
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