Injection Molding
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Radial streaks on the surface of PET products
Problem Phenomenon
Radial streaks like sun rays appear on the surface of PET injection molded products centered on the gate.
Cause Analysis
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.
Solution
Increase melt and mold temperature; appropriately increase injection speed (multi-stage injection); enlarge the gate; mold temperature 130-150°C.
Key Takeaway
PET radial streaks are caused by unstable melt front flow.
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