Processing Machinery
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PVC Embrittlement
Fenómeno del problema
PVC products are brittle and easy to break, failing impact tests
Análisis de la causa
Degradation lowers molecular weight, or overpacking causes high internal stress, embrittling products; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solución
Check temperature and residence to rule out degradation; optimize holding pressure; verify with impact tests; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Conclusión clave
For embrittlement, check degradation first, then internal stress; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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