Molds & Tooling
6 مشاهدة
Internal shrinkage voids of PU
ظاهرة المشكلة
Shrinkage voids of 0.5-2mm diameter in the center of PU thick-walled products
تحليل الأسباب
After cooling of thick-walled area, interior shrinks but surface already solidified, cannot be fed; holding time insufficient, gate freezes too early
الحل
1) Extend holding time until the gate is completely frozen; 2) Increase gate size to delay freezing; 3) Product design to reduce wall thickness differences
الخلاصة الأساسية
Shrinkage voids are caused by thick-wall shrinkage and insufficient holding; extending holding is key
هل كان هذا مفيدًا؟
0 شخص وجدوا هذا مفيدًا
شكرًا لك على ملاحظاتك!