Molds & Tooling
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PPS Warpage
Problem Phenomenon
Glass fiber PPS flat parts warp out of tolerance, and improvement is limited after adjusting holding pressure and mold temperature
Cause Analysis
PPS warpage originates from fiber orientation anisotropy and uneven cooling; excessive holding pressure instead increases internal stress warpage; gate type and position are the structural main causes; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
①Pin-point gates or multiple pin-point gates to homogenize orientation; ②Balanced cooling water circuit design; ③Moderate holding pressure, avoiding over-holding; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PPS warpage treatment prioritizes structure; pin-point gates homogenize orientation plus balanced cooling, and over-holding is as bad as under-holding; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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