Injection Molding
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CEF '2079851475616104452 mold venting burnt
Problem Phenomenon
Insufficient venting of the CEF injection mold causes the air in the cavity to be compressed and heated up, leading to local burnt
Cause Analysis
The mold vent groove area is insufficient or the position is improper; the injection speed is too fast and the air has no time to be discharged; the air is compressed to a high temperature >200°C causing oxidative burnt
Solution
1) Increase the vent groove area, depth 0.02-0.03mm, width 5-10mm; 2) Set the vent grooves in the last-filled area of the melt; 3) Reduce the injection speed to reduce air compression; 4) Multi-stage injection with slow advance for venting
Key Takeaway
Burnt is caused by insufficient venting and high-speed injection compressing air; increasing venting and reducing speed are the key
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