Material Analysis
9 views
Burnt odor in PET bottles after blowing
Problem Phenomenon
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.
Cause Analysis
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.
Solution
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.
Key Takeaway
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.
Was this helpful?
0 people found this helpful
Thank you for your feedback!