Molds & Tooling
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PPS Weld Line Strength
Problem Phenomenon
Multi-gate parts show obvious weld lines, break along the weld line under load, and deepening the venting causes flash
Cause Analysis
At the confluence of PPS melt fronts, molecular chain entanglement is insufficient and glass fiber orientation is unfavorable; the vent groove depth must be controlled at the 0.0127mm level—if too deep, flash occurs immediately, so the weld line venting window is extremely narrow
Solution
①Vent groove depth about 0.0127mm in the weld line area; ②Increase melt temperature and injection speed to improve fusion; ③Lay out gates so the weld line avoids the load-bearing area
Key Takeaway
The difficulty of PPS weld line treatment lies in the 0.0127mm venting precision; temperature and speed optimization combined with position transfer are used together; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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