Extrusion & Post
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Excessive EEA film heat shrinkage
Problembeschreibung
EEA film heat shrinkage at 80°C >12% exceeding the 5% dimensional stability requirement
Ursachenanalyse
EEA extrusion orientation released after heating causing large shrinkage; EEA thermal expansion coefficient large; film cooling froze a large amount of orientation stress
Lösung
1) Reduce extrusion draw ratio to reduce orientation freezing; 2) Anneal the film at 60-80°C to release orientation stress; 3) Add 5-10wt% rigid resin to reduce heat shrinkage; 4) Biaxial stretching process to balance orientation
Wichtigste Erkenntnis
Film heat shrinkage is caused by orientation freezing; reducing draw ratio and annealing are the key
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