Extrusion & Post
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PPS annealing treatment
Fenómeno do problema
Internal cracks in PPS products, or dimensional drift of high-precision parts over time
Análise das causas
PPS surface layer rapidly cools with insufficient crystallization forming skin-core crystallization difference, internal stress causes cracks; annealing 160-180℃×2-8 hours (or 204-232℃×2-6h) homogenizes crystallization and eliminates stress
Solução
①Annealing 160-180℃×2-8h adjusted by wall thickness; ②dimension re-inspection of precision parts after annealing; ③internal crack parts remedied by hot water annealing; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusão principal
Annealing is the standard post-treatment for PPS stress relief and dimensional stabilization; hidden cracks from skin-core crystallization difference are radically cured by annealing; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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