Injection Molding
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Flow marks in EVA '2079851475616104452
Problem Phenomenon
Radial flow marks centered on the gate appear on EVA injection molded product surface
Cause Analysis
Injection speed too fast causing unstable melt front; mold temperature too low <30°C with front cooling rapidly forming marks
Solution
1) Adopt multi-stage injection speed slow-fast-slow to control front stability; 2) Increase mold temperature to 40-50°C to delay front cooling; 3) Stabilize injection pressure to avoid fluctuation; 4) Enlarge gate area to reduce pressure abrupt change at gate
Key Takeaway
Flow marks are caused by unstable injection front and rapid cooling; multi-stage injection and high mold temperature are key
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