Molds & Tooling
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PPS Warpage Deformation
Problem Phenomenon
Warpage out of tolerance after demolding.
Cause Analysis
Uneven mold temperature makes crystallization shrinkage inconsistent; PPS's high crystallization characteristic is sensitive to temperature differences; fiber orientation also causes anisotropy.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Balance mold temperature; ②optimize cooling water channels; ③adjust gates to balance fiber orientation; ④improve mold temperature uniformity.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PPS warpage relies on mold temperature uniformity and orientation management; temperature difference control of high-temperature molds is the difficulty.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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