Injection Molding
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Radial streaks on the surface of PET products
Fenómeno del problema
Radial streaks like sun rays appear on the surface of PET injection molded products centered on the gate.
Análisis de la causa
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.
Solución
Increase melt and mold temperature; appropriately increase injection speed (multi-stage injection); enlarge the gate; mold temperature 130-150°C.
Conclusión clave
PET radial streaks are caused by unstable melt front flow.
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