Extrusion & Post
11 görüntüleme
EVOH film heat shrinkage rate is too large
Sorun Belirtisi
EVOH film heat shrinkage rate at 80°C >12%, exceeding the 5% dimensional stability requirement
Neden Analizi
EVOH extrusion orientation released after heating causing large shrinkage; EVOH thermal expansion coefficient large; film cooling froze a large amount of orientation stress
Çözüm
1) Reduce extrusion draw ratio to reduce orientation freezing; 2) Film annealing treatment at 60-80°C to release orientation stress; 3) Add 5-10wt% rigid resin to reduce heat shrinkage rate; 4) Biaxial stretching process to balance orientation
Temel Çıkarım
Film heat shrinkage is caused by orientation freezing; reducing draw ratio and annealing treatment are key
Bu faydalı oldu mu?
0 kişi bunu faydalı buldu
Geri bildiriminiz için teşekkürler!