Molding Process
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PET hot-fill bottle
Fenómeno do problema
Hot-fill PET bottles deform and shrink after filling, and the bottle body collapses and cannot be put on the shelf
Análise das causas
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
Solução
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
Conclusão principal
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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