Processing Machinery
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PET melt actual measurement
Fenómeno del problema
PET preforms produced at the set temperature have large fluctuations in acetaldehyde content
Análisis de la causa
There is a deviation between the set temperature and the actual melt temperature, and the acetaldehyde generation is extremely sensitive to the actual temperature; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
Regularly actually measure the air-shot melt temperature; correct the setting with the measured value; establish a correlation curve between acetaldehyde content and melt temperature; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Conclusión clave
Acetaldehyde control must be based on the actually measured melt temperature; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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