Injection Molding
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POE '2079851475616104452 flow marks
Problem Phenomenon
POE injection molded product surface shows radial flow marks centered on the gate
Cause Analysis
Injection speed too fast causes melt front instability; mold temperature too low <30°C, front rapidly cools forming marks
Solution
1) Adopt multi-stage injection speed slow-fast-slow to control front stability; 2) Raise mold temperature to 40-50°C to delay front cooling; 3) Stabilize injection pressure to avoid fluctuation; 4) Enlarge gate area to reduce sudden pressure 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 key
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