Extrusion & Post
1 views
PET Preform Aging (Long Inventory)
Problem Phenomenon
Preforms stored for 6~12 months are difficult to stretch and require higher oven temperature.
Cause Analysis
Long-stored PET preforms have IV degradation and the material becomes hard, with high stretching resistance at standard temperature.
Solution
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.
Key Takeaway
Old preforms = hardened preforms; temperature compensation must keep up.
Was this helpful?
0 people found this helpful
Thank you for your feedback!