Blow Molding
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Uneven bottom of blow molded containers
Problem Phenomenon
The bottom of blow molded containers is uneven, warped and deformed, affecting container upright stability
Cause Analysis
Insufficient bottom cooling
Uneven mold temperature, bottom too high
Uneven blowing pressure distribution, insufficient bottom stretching
Parison bottom too thick, shrinkage difference
Bottom temperature too high at demolding
Solution
Strengthen bottom cooling
Reduce bottom mold temperature
Adjust blowing pressure distribution
Control parison bottom wall thickness
Ensure demolding after the bottom is completely cooled
Key Takeaway
Bottom warpage needs strengthened cooling and wall thickness control
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