Molding Process
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Neck deformation of PET bottles during hot filling
Problem Phenomenon
During PET bottle hot filling (88-92°C), the bottle mouth thread area softens and deforms, sealing fails.
Cause Analysis
Insufficient bottle mouth heat resistance exceeding PET Tg (70-80°C), insufficient bottle mouth design wall thickness, no heat setting treatment.
Solution
Increase bottle mouth wall thickness; crystallization heat treatment of the bottle mouth (heat to 180-200°C); use heat-resistant grade PET formula with nucleating agents.
Key Takeaway
PET bottle hot filling adaptability requires the bottle mouth to have sufficient heat resistance strength and dimensional stability.
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