Injection Molding
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Flow marks appearing on PET injection molded parts
Problem Phenomenon
Wavy or snakeskin-like flow marks appear on the surface of PET products.
Cause Analysis
Melt temperature is on the low side and the flow front solidifies intermittently; injection speed is slow or unstable; cavity wall temperature is on the low side.
Solution
Increase melt temperature by 10-20°C; appropriately increase injection speed; mold temperature 130-150°C; optimize gate design.
Key Takeaway
PET flow marks are caused by an unstable melt front during filling.
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