Material Drying
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Pitting and white haze inside PET bottles (unclean air source)
Problem Phenomenon
Fine dense pits and foggy turbidity appear on the inner wall of the bottle, which cannot be wiped off or washed clean; when it occurs in batches, it is often related to the production shift.
Cause Analysis
The compressed air used for bottle blowing carries oil, moisture, or dust, which is blown directly into the bottle and adheres to the inner wall; failure of the air compressor system filters and water accumulation in the air storage tank are high-frequency causes.
Solution
①Set up and regularly replace precision filtration devices for the compressed air; ②drain the accumulated water from the air storage tank and overhaul the dryer; ③reduce the humidity of the blown-in air; ④perform cleanliness testing on the air source.
Key Takeaway
Bottle interior contamination points directly to compressed air quality; food-grade bottle blowing requires a clean air source, and the inspection and replacement cycle of the filtration system must be included in the daily maintenance plan.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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