Injection Molding
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EEA injection flow marks
Problem Phenomenon
Radial flow marks centered on the gate appearing on the EEA injection molded product surface
Cause Analysis
Injection speed too fast causing unstable melt front; mold temperature too low <30°C, 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) Increase gate area to reduce pressure sudden change 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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