Injection Molding
13 مشاهدة
Radial streaks on the surface of PET products
ظاهرة المشكلة
Radial streaks like sun rays appear on the surface of PET injection molded products centered on the gate.
تحليل الأسباب
When the melt enters the cavity, the temperature is on the low side and the front is cooled by the mold wall, forming ripples; injection speed is slow, mold temperature is low, and the gate is on the small side.
الحل
Increase melt and mold temperature; appropriately increase injection speed (multi-stage injection); enlarge the gate; mold temperature 130-150°C.
الخلاصة الأساسية
PET radial streaks are caused by unstable melt front flow.
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