Extrusion & Post
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PPS Internal Crack Hot Water Inspection
Problem Phenomenon
The part looks normal, but brittle cracking occurs after assembly, and internal microcracks are found upon tracing
Cause Analysis
Internal microcracks formed by the skin-core crystallization difference of PPS are not visible in appearance; hot water immersion inspection can make cracks visible; parts can only be released after annealing treatment eliminates them and re-inspection passes
Solution
①Hot water immersion inspection for internal cracks on critical parts; ②Anneal cracked parts and re-inspect; ③Include all thick-wall parts in the annealing process; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PPS internal cracks are invisible bombs; hot water inspection plus annealing intercepts hidden dangers before leaving the factory; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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