Molds & Tooling
6 مشاهدة
Yellow-brown or black specks appear locally on the product
ظاهرة المشكلة
Yellow-brown or black specks appear locally on the product, accompanied by burnt odor, burnt areas rough and carbonized on the surface
تحليل الأسباب
Barrel temperature too high (far exceeding the 170-230°C upper limit), severe material degradation
Screw speed too fast, excessive shear, thermal degradation
Poor mold venting, gas compressed and heated
Residence time too long, material repeatedly heated in the barrel
Regrind ratio too high, degradation accumulation
الحل
Lower barrel temperature to the reasonable 170-230°C range
Reduce screw speed to reduce shear heat
Improve mold venting to prevent gas compression heating
Reduce residence time, shorten cycle time
Reduce regrind ratio ≤15%
الخلاصة الأساسية
Burnt is caused by overheating degradation or poor venting
هل كان هذا مفيدًا؟
0 شخص وجدوا هذا مفيدًا
شكرًا لك على ملاحظاتك!