Injection Molding
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PPS Flash Overflow
Problem Phenomenon
Flash at part edges, flash intensifies after parting line wear, and clamping force calculation is sufficient
Cause Analysis
PPS melt has good fluidity and low viscosity, penetrating even micro-gaps in the parting line; mold wear and uneven mold clamping are the main causes; excessive injection pressure also promotes flash; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
①Regrind the parting line to restore fit; ②Reduce injection and holding pressure; ③Maintain molds at HRC55-60 hardness; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PPS flash is a contest between low viscosity and mold condition; mold hardness maintenance is the long-term defense line; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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