Material Analysis
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Burnt odor in PET bottles after blowing
Fenómeno del problema
The finished bottles carry an obvious burnt odor, which may contaminate the flavor of the contents after filling; drinking water products are especially sensitive to this.
Análisis de la causa
Excessively high heating temperature causes PET thermal decomposition producing odorous substances; unclean compressed air carries an oily smell; using inferior or severely degraded raw material also produces burnt odor.
Solución
①Lower the bottle blowing heating temperature; ②tidy up the air compressor and filters to ensure a clean air source; ③switch to qualified raw material from regular manufacturers; ④check the temperature uniformity of the heating lamp box.
Conclusión clave
Burnt odor is a signal of thermal degradation or contamination and is a flavor safety defect; control temperature, purify the air, and select good material in a three-pronged approach, and batches with odor should be isolated for evaluation.
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