Injection Molding
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CEF injection flow marks
Problem Phenomenon
Radial flow marks centered on the gate appear on the surface of the CEF injection molded part
Cause Analysis
The injection speed is too fast, causing the melt front to be unstable; the mold temperature is too low <30°C and the front cools rapidly to form marks
Solution
1) Adopt multi-stage injection speed slow-fast-slow to control the stability of the front; 2) Increase the mold temperature to 40-50°C to delay the cooling of the front; 3) Stabilize the injection pressure to avoid fluctuations; 4) Increase 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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