Extrusion & Post
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PET Bottle Insufficient High-Pressure Air
Problem Phenomenon
During bottle blowing the pressure gauge drops below 25Bar, bottle details are blurred and the surface is hazy.
Cause Analysis
High-pressure air compressor capacity is insufficient or the system leaks; in the late stretching stage the plastic cools below Tg before contacting the mold, and the cold stretching in the final stage forms haze and a blurred logo.
Solution
①Monitor the pressure curve throughout the blowing process; ②expand the air compressor capacity or add an air storage tank for buffering; ③check for leakage; ④ensure 30~35Bar for water/juice bottles and 35~40Bar for carbonated bottles.
Key Takeaway
High-pressure air is the guarantee of the last millimeter of stretching.
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