Injection Molding
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Radial streaks on the surface of PET products
Fenómeno do problema
Radial streaks like sun rays appear on the surface of PET injection molded products centered on the gate.
Análise das causas
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.
Solução
Increase melt and mold temperature; appropriately increase injection speed (multi-stage injection); enlarge the gate; mold temperature 130-150°C.
Conclusão principal
PET radial streaks are caused by unstable melt front flow.
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