Extrusion & Post
6 مشاهدة
LLDPE Blown Film Melt Fracture
ظاهرة المشكلة
The film surface is overall orange-peel-like and thread-like rough, more severe than sharkskin.
تحليل الأسباب
The outlet shear rate far exceeds the critical value, and the melt becomes overall unstable; low die temperature and excessive output are the main causes.
الحل
① Reduce output/line speed; ② raise the die temperature; ③ enlarge the die lip gap to reduce shear; ④ use PPA; ⑤ check whether there are abrupt changes in the die flow channel.
الخلاصة الأساسية
For melt fracture, first reduce shear, then raise temperature.
هل كان هذا مفيدًا؟
0 شخص وجدوا هذا مفيدًا
شكرًا لك على ملاحظاتك!