Extrusion & Post
5 görüntüleme
Excessive thermal shrinkage rate of PET biaxially stretched film
Sorun Belirtisi
The thermal shrinkage rate of PET film exceeds the standard (longitudinal >3%, transverse >2%), causing inaccurate printing registration.
Neden Analizi
Insufficient heat setting treatment after stretching (temperature on the low side or time insufficient); large draw ratio results in high internal stress; cooling is too fast.
Çözüm
Increase heat setting temperature to 200-230°C; increase setting time; appropriately reduce the draw ratio; control cooling rate.
Temel Çıkarım
PET film thermal shrinkage rate is dominated by the heat setting process.
Bu faydalı oldu mu?
0 kişi bunu faydalı buldu
Geri bildiriminiz için teşekkürler!