Extrusion & Post
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PET Preform Aging (Long Inventory)
Fenómeno do problema
Preforms stored for 6~12 months are difficult to stretch and require higher oven temperature.
Análise das causas
Long-stored PET preforms have IV degradation and the material becomes hard, with high stretching resistance at standard temperature.
Solução
①Check the preform production date, first-in first-out; ②raise the oven temperature of old preforms by 2%~3% overall for compensation; ③downgrade severely aged preforms.
Conclusão principal
Old preforms = hardened preforms; temperature compensation must keep up.
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