Extrusion & Post
9 Aufrufe
Excessive Thermal Shrinkage of CMC Film
Problembeschreibung
Thermal shrinkage of CMC film at 80°C is >12%, exceeding the 5% dimensional stability requirement
Ursachenanalyse
CMC extrusion orientation is released after heating, causing large shrinkage; CMC thermal expansion coefficient is large; film cooling freezes a large amount of orientation stress
Lösung
1)Reduce extrusion draw ratio to reduce orientation freezing; 2)Film annealing at 60-80°C to release orientation stress; 3)Add 5-10wt% rigid resin to reduce thermal shrinkage; 4)Biaxial stretching process to balance orientation
Wichtigste Erkenntnis
Film thermal shrinkage is caused by orientation freezing; reducing draw ratio and annealing treatment are the key
War das hilfreich?
0 Personen fanden dies hilfreich
Vielen Dank für Ihr Feedback!