Molding Process
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PPS wall thickness design upper limit
Fenómeno do problema
Thick-walled PPS products have shrinkage cavities and internal cracks in the center, cross-section strength unqualified
Análise das causas
PPS wall thickness should not exceed 7-10mm: insufficient feeding at the thick-wall center forms shrinkage cavities; and rapid cooling of the surface layer and slow cooling inside produce internal stress cracks; thick-wall design requires special caution
Solução
①Wall thickness controlled within 7-10mm; ②strengthen holding pressure feeding in thick-wall areas; ③internal crack parts hot water annealed to eliminate stress; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusão principal
PBT thick wall is the structural forbidden zone of PPS; 7-10mm upper limit plus holding pressure feeding, cracks remedied by annealing; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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