Injection Molding
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PPS Flash and Overflow
Problem Phenomenon
Severe flash at the parting line and ejector pins of PPS products, requiring cleaning almost every shot.
Cause Analysis
PPS melt has excellent fluidity (low viscosity) and easily penetrates tiny mold gaps; insufficient parting line fit accuracy, insufficient clamping force or excessive injection pressure all form flash.
Solution
①Control parting line fit accuracy within 0.01mm; ②check and increase clamping force; ③reduce injection pressure and speed; ④repair worn parting lines and inserts.
Key Takeaway
Flash is the number one problem in PPS processing; its low-viscosity characteristic requires mold fit accuracy far higher than conventional engineering plastics.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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