Processing Machinery
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PET melt temperature range
Fenómeno del problema
The PET melt temperature is set to 295℃ to improve filling, and the preform body turns yellow with acetaldehyde exceeding the standard
Análisis de la causa
PET melt thermal degradation accelerates above 290℃, the acetaldehyde generation surges, and both the taste and hygiene indicators of beverage bottles are affected; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
Control the preform melt temperature at 270-285℃; take the lower limit for acetaldehyde-sensitive products; solve filling problems with mold temperature and speed; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Conclusión clave
The melt temperature upper limit is constrained by both degradation and acetaldehyde; 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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