Injection Molding
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PC Product Surface Flow Marks
Problem Phenomenon
Visible wavy flow marks on the PC product surface, obvious on high-gloss surfaces.
Cause Analysis
Front temperature drops too fast or injection speed fluctuates; low mold temperature and a small gate cause unstable filling.
Solution
①Increase mold temperature and melt temperature; ②Optimize the speed curve to keep the front stable; ③Enlarge the gate; ④Check hot runner temperature uniformity.
Key Takeaway
Flow mark treatment = constant front temperature and speed.
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