Molds & Tooling
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PVC Hot Runner Risk
Fenómeno del problema
PVC hot runner molds frequently show degradation black spots
Análisis de la causa
Hot runner dead corners and local overheating make PVC stay and degrade; hot runner risk for PVC is higher than other materials; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience.
Solución
PVC hot runner choose large-runner dead-corner-free design; temperature precisely calibrated; prioritize cold runner; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
PVC with hot runner needs extra caution, cold runner is safer; 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 later
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