Molds & Tooling
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PPS pinpoint gate reduces orientation
Problem Phenomenon
Glass fiber PBT-type flat parts show obvious warpage, flatness improved after changing to pinpoint gate
Cause Analysis
PPS melt flows radially from the pinpoint gate to all sides, fiber orientation is more uniform in all directions, which can reduce longitudinal and transverse shrinkage difference; film gate improves flatness, disc gate improves roundness
Solution
①Flat parts prefer pinpoint gate or film gate; ②cylindrical parts choose disc gate; ③include fiber orientation evaluation in the gate design stage; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Gate form is a structural means of PPS orientation management; pinpoint gate radial flow is the classic solution for low warpage; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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