Molding Process
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Deformation of PET bottles during microwave heating
Problem Phenomenon
PET bottles deform or shrink when heated in a microwave oven, and the contents overflow.
Cause Analysis
PET Tg (70-80°C) is relatively low; microwave heating raises the contents above this temperature, softening the bottle body.
Solution
Use heat-resistant PET grades (crystalline type, HDT≥100°C); use multi-layer heat-resistant structures; label as not suitable for microwave use.
Key Takeaway
Conventional PET bottles are not suitable for microwave heating; special heat-resistant design and materials are needed.
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