Injection Molding
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Flow Marks in CMC '2079851475616104452
Problem Phenomenon
Radial flow marks centered on the gate appear on the surface of CMC injection molded products
Cause Analysis
Injection speed is too fast, causing unstable melt front; 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 front stability; 2)Increase mold temperature to 40-50°C to delay front cooling; 3)Stabilize injection pressure to avoid fluctuations; 4)Increase 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 the key
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