Extrusion & Post
6 مشاهدة
Insufficient orientation degree of PET film
ظاهرة المشكلة
The refractive index difference between the longitudinal and transverse directions of PET biaxially stretched film is insufficient; orientation degree is inadequate and strength is on the low side.
تحليل الأسباب
The draw ratio is too small (longitudinal <3 times, transverse <3 times); stretching temperature is on the high side, molecular chains relax too fast and orientation is eliminated.
الحل
Appropriately increase the draw ratio; reduce stretching temperature (operate at 10-20°C above Tg); accelerate the cooling rate after stretching to fix the orientation.
الخلاصة الأساسية
PET film orientation degree determines film strength; draw ratio and temperature are the core parameters.
هل كان هذا مفيدًا؟
0 شخص وجدوا هذا مفيدًا
شكرًا لك على ملاحظاتك!