Injection Molding
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Flow marks in EAA '2079851475616104452
Problem Phenomenon
Radial flow marks centered on the gate appear on the surface of EAA injection molded products
Cause Analysis
Injection speed too fast causes unstable melt front; mold temperature too low <30°C, the front cools rapidly and forms marks
Solution
1) Use multi-stage injection speed slow-fast-slow to control front stability; 2) Raise the mold temperature to 40-50°C to delay front cooling; 3) Stabilize the injection pressure to avoid fluctuations; 4) Enlarge the gate area to reduce sudden pressure changes at the gate
Key Takeaway
Flow marks are caused by unstable injection front and rapid cooling; multi-stage injection and high mold temperature are the key
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