Processing Machinery
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PVC Narrow Processing Window
Fenómeno del problema
PVC melt temperature slightly high degrades, slightly low gives poor plasticization, hard to adjust machine
Análisis de la causa
PVC melting temperature close to degradation temperature, processing window only 160-195℃, high temperature control precision required; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience.
Solución
Barrel temperature precisely controlled by 160-190℃ gradient; temperature controller regularly calibrated; process parameters fine-tuned in small steps; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
PVC adjustment must be small steps and fast pace, temperature window only 35℃; 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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