Molding Process
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PET hot-fill bottle
Problem Phenomenon
Hot-fill PET bottles deform and shrink after filling, and the bottle body collapses and cannot be put on the shelf
Cause Analysis
Ordinary PET bottles withstand temperatures of only 60-70℃, and hot-filling contents at 85-90℃ softens and deforms the bottle body; heat-setting treatment to increase crystallinity is required to withstand the hot-fill temperature
Solution
①For hot-fill bottles, select a heat-setting process and temperature-resistant grade; ②match the preform crystallinity with the bottle blowing heat-setting parameters; ③verify the filling temperature and the bottle's temperature resistance; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Hot filling is a high-end process for PET bottles; heat-set crystallinity is the foundation of temperature resistance, and ordinary bottles cannot be used beyond their level; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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