Molding Process
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Negative pressure deformation of PET hot-fill bottles
Problem Phenomenon
After hot filling and cooling, the body of the PET hot-fill bottle dents inward and deforms, and the label wrinkles.
Cause Analysis
Hot filling and cooling produce negative pressure; the bottle structure strength is insufficient to resist the negative pressure; bottle body reinforcing rib design is insufficient; wall thickness is inadequate.
Solution
Adopt hot-fill special bottle designs (adding vacuum absorption panels); increase wall thickness; use heat-resistant PET grades; use nitrogen filling compensation.
Key Takeaway
PET hot-fill bottles need special structural design and material selection to cope with negative pressure.
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