Extrusion & Post
14 visualizaciones
Excessive thermal shrinkage of EAA film
Fenómeno del problema
The thermal shrinkage of EAA film at 80°C is >12%, exceeding the 5% dimensional stability requirement
Análisis de la causa
EAA extrusion orientation is released after heating, causing large shrinkage; EAA has a large thermal expansion coefficient; film cooling freezes a large amount of orientation stress
Solución
1) Reduce the 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 thermal shrinkage; 4) Use a biaxial stretching process to balance orientation
Conclusión clave
Film thermal shrinkage is caused by orientation freezing; reducing the draw ratio and annealing treatment are the key
¿Le ha resultado útil?
0 personas encontraron esto útil
¡Gracias por sus comentarios!