Injection Molding
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PPS injection pressure 50-100MPa
Problem Phenomenon
Thin-walled parts underfilled, or excessive pressure causes flash and demolding difficulty
Cause Analysis
PPS injection pressure is conventionally 50-100MPa, holding pressure 30-70MPa; insufficient pressure causes short shots, too high causes flash and increases residual stress; glass fiber grades take the middle to upper limit
Solution
①Injection pressure 50-100MPa adjusted according to structure; ②holding pressure 30-70MPa; ③when flash occurs, first reduce holding pressure then check the mold; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PPS pressure window 50-100MPa; staged holding pressure control is a common means of preventing flash and sink marks; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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