Material Analysis
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PVC Embrittlement Degradation Consequence
Fenómeno do problema
Products were brittle and easy to break, batch-failed impact tests, yet appearance showed no obvious abnormality
Análise das causas
Severe shear or accumulated thermal history breaks PVC molecular chains; appearance is acceptable but mechanical properties have deteriorated; embrittlement is a hidden consequence of degradation, often discovered only at the customer
Solução
①Reduce screw speed and shear; ②control temperature and residence; ③include impact sampling in routine inspection; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Conclusão principal
PVC embrittlement is hidden degradation; mechanical sampling intercepts earlier than appearance inspection; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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